[Patch V10 7/8] usb: gadget: Add UDC driver for tegra XUSB device mode controller

From: Nagarjuna Kristam
Date: Mon Sep 23 2019 - 04:27:14 EST

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This patch adds UDC driver for tegra XUSB 3.0 device mode controller.
XUSB device mode controller supports SS, HS and FS modes

Based on work by:
Mark Kuo <mkuo@xxxxxxxxxx>
Hui Fu <hfu@xxxxxxxxxx>
Andrew Bresticker <abrestic@xxxxxxxxxxxx>

Signed-off-by: Nagarjuna Kristam <nkristam@xxxxxxxxxx>
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/usb/gadget/udc/Kconfig | 11 +
drivers/usb/gadget/udc/Makefile | 1 +
drivers/usb/gadget/udc/tegra-xudc.c | 3787 +++++++++++++++++++++++++++++++++++
3 files changed, 3799 insertions(+)
create mode 100644 drivers/usb/gadget/udc/tegra-xudc.c

diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index d7e6116..9160a6a 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -441,6 +441,17 @@ config USB_GADGET_XILINX
dynamically linked module called "udc-xilinx" and force all
gadget drivers to also be dynamically linked.

+config USB_TEGRA_XUDC
+ tristate "NVIDIA Tegra Superspeed USB 3.0 Device Controller"
+ depends on ARCH_TEGRA || COMPILE_TEST
+ depends on PHY_TEGRA_XUSB
+ help
+ Enables NVIDIA Tegra USB 3.0 device mode controller driver.
+
+ Say "y" to link the driver statically, or "m" to build a
+ dynamically linked module called "tegra_xudc" and force all
+ gadget drivers to also be dynamically linked.
+
source "drivers/usb/gadget/udc/aspeed-vhub/Kconfig"

#
diff --git a/drivers/usb/gadget/udc/Makefile b/drivers/usb/gadget/udc/Makefile
index 897f648..f6777e6 100644
--- a/drivers/usb/gadget/udc/Makefile
+++ b/drivers/usb/gadget/udc/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_BCM63XX_UDC) += bcm63xx_udc.o
obj-$(CONFIG_USB_FSL_USB2) += fsl_usb2_udc.o
fsl_usb2_udc-y := fsl_udc_core.o
fsl_usb2_udc-$(CONFIG_ARCH_MXC) += fsl_mxc_udc.o
+obj-$(CONFIG_USB_TEGRA_XUDC) += tegra-xudc.o
obj-$(CONFIG_USB_M66592) += m66592-udc.o
obj-$(CONFIG_USB_R8A66597) += r8a66597-udc.o
obj-$(CONFIG_USB_RENESAS_USB3) += renesas_usb3.o
diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
new file mode 100644
index 0000000..5124f61
--- /dev/null
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -0,0 +1,3787 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * NVIDIA Tegra XUSB device mode controller
+ *
+ * Copyright (c) 2013-2019, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2015, Google Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/phy/tegra/xusb.h>
+#include <linux/pm_domain.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/role.h>
+#include <linux/workqueue.h>
+
+/* XUSB_DEV registers */
+#define SPARAM 0x000
+#define SPARAM_ERSTMAX_MASK GENMASK(20, 16)
+#define SPARAM_ERSTMAX(x) (((x) << 16) & SPARAM_ERSTMAX_MASK)
+#define DB 0x004
+#define DB_TARGET_MASK GENMASK(15, 8)
+#define DB_TARGET(x) (((x) << 8) & DB_TARGET_MASK)
+#define DB_STREAMID_MASK GENMASK(31, 16)
+#define DB_STREAMID(x) (((x) << 16) & DB_STREAMID_MASK)
+#define ERSTSZ 0x008
+#define ERSTSZ_ERSTXSZ_SHIFT(x) ((x) * 16)
+#define ERSTSZ_ERSTXSZ_MASK GENMASK(15, 0)
+#define ERSTXBALO(x) (0x010 + 8 * (x))
+#define ERSTXBAHI(x) (0x014 + 8 * (x))
+#define ERDPLO 0x020
+#define ERDPLO_EHB BIT(3)
+#define ERDPHI 0x024
+#define EREPLO 0x028
+#define EREPLO_ECS BIT(0)
+#define EREPLO_SEGI BIT(1)
+#define EREPHI 0x02c
+#define CTRL 0x030
+#define CTRL_RUN BIT(0)
+#define CTRL_LSE BIT(1)
+#define CTRL_IE BIT(4)
+#define CTRL_SMI_EVT BIT(5)
+#define CTRL_SMI_DSE BIT(6)
+#define CTRL_EWE BIT(7)
+#define CTRL_DEVADDR_MASK GENMASK(30, 24)
+#define CTRL_DEVADDR(x) (((x) << 24) & CTRL_DEVADDR_MASK)
+#define CTRL_ENABLE BIT(31)
+#define ST 0x034
+#define ST_RC BIT(0)
+#define ST_IP BIT(4)
+#define RT_IMOD 0x038
+#define RT_IMOD_IMODI_MASK GENMASK(15, 0)
+#define RT_IMOD_IMODI(x) ((x) & RT_IMOD_IMODI_MASK)
+#define RT_IMOD_IMODC_MASK GENMASK(31, 16)
+#define RT_IMOD_IMODC(x) (((x) << 16) & RT_IMOD_IMODC_MASK)
+#define PORTSC 0x03c
+#define PORTSC_CCS BIT(0)
+#define PORTSC_PED BIT(1)
+#define PORTSC_PR BIT(4)
+#define PORTSC_PLS_SHIFT 5
+#define PORTSC_PLS_MASK GENMASK(8, 5)
+#define PORTSC_PLS_U0 0x0
+#define PORTSC_PLS_U2 0x2
+#define PORTSC_PLS_U3 0x3
+#define PORTSC_PLS_DISABLED 0x4
+#define PORTSC_PLS_RXDETECT 0x5
+#define PORTSC_PLS_INACTIVE 0x6
+#define PORTSC_PLS_RESUME 0xf
+#define PORTSC_PLS(x) (((x) << PORTSC_PLS_SHIFT) & PORTSC_PLS_MASK)
+#define PORTSC_PS_SHIFT 10
+#define PORTSC_PS_MASK GENMASK(13, 10)
+#define PORTSC_PS_UNDEFINED 0x0
+#define PORTSC_PS_FS 0x1
+#define PORTSC_PS_LS 0x2
+#define PORTSC_PS_HS 0x3
+#define PORTSC_PS_SS 0x4
+#define PORTSC_LWS BIT(16)
+#define PORTSC_CSC BIT(17)
+#define PORTSC_WRC BIT(19)
+#define PORTSC_PRC BIT(21)
+#define PORTSC_PLC BIT(22)
+#define PORTSC_CEC BIT(23)
+#define PORTSC_WPR BIT(30)
+#define PORTSC_CHANGE_MASK (PORTSC_CSC | PORTSC_WRC | PORTSC_PRC | \
+ PORTSC_PLC | PORTSC_CEC)
+#define ECPLO 0x040
+#define ECPHI 0x044
+#define MFINDEX 0x048
+#define MFINDEX_FRAME_SHIFT 3
+#define MFINDEX_FRAME_MASK GENMASK(13, 3)
+#define PORTPM 0x04c
+#define PORTPM_L1S_MASK GENMASK(1, 0)
+#define PORTPM_L1S_DROP 0x0
+#define PORTPM_L1S_ACCEPT 0x1
+#define PORTPM_L1S_NYET 0x2
+#define PORTPM_L1S_STALL 0x3
+#define PORTPM_L1S(x) ((x) & PORTPM_L1S_MASK)
+#define PORTPM_RWE BIT(3)
+#define PORTPM_U2TIMEOUT_MASK GENMASK(15, 8)
+#define PORTPM_U1TIMEOUT_MASK GENMASK(23, 16)
+#define PORTPM_FLA BIT(24)
+#define PORTPM_VBA BIT(25)
+#define PORTPM_WOC BIT(26)
+#define PORTPM_WOD BIT(27)
+#define PORTPM_U1E BIT(28)
+#define PORTPM_U2E BIT(29)
+#define PORTPM_FRWE BIT(30)
+#define PORTPM_PNG_CYA BIT(31)
+#define EP_HALT 0x050
+#define EP_PAUSE 0x054
+#define EP_RELOAD 0x058
+#define EP_STCHG 0x05c
+#define DEVNOTIF_LO 0x064
+#define DEVNOTIF_LO_TRIG BIT(0)
+#define DEVNOTIF_LO_TYPE_MASK GENMASK(7, 4)
+#define DEVNOTIF_LO_TYPE(x) (((x) << 4) & DEVNOTIF_LO_TYPE_MASK)
+#define DEVNOTIF_LO_TYPE_FUNCTION_WAKE 0x1
+#define DEVNOTIF_HI 0x068
+#define PORTHALT 0x06c
+#define PORTHALT_HALT_LTSSM BIT(0)
+#define PORTHALT_HALT_REJECT BIT(1)
+#define PORTHALT_STCHG_REQ BIT(20)
+#define PORTHALT_STCHG_INTR_EN BIT(24)
+#define PORT_TM 0x070
+#define EP_THREAD_ACTIVE 0x074
+#define EP_STOPPED 0x078
+#define HSFSPI_COUNT0 0x100
+#define HSFSPI_COUNT13 0x134
+#define HSFSPI_COUNT13_U2_RESUME_K_DURATION_MASK GENMASK(29, 0)
+#define HSFSPI_COUNT13_U2_RESUME_K_DURATION(x) ((x) & \
+ HSFSPI_COUNT13_U2_RESUME_K_DURATION_MASK)
+#define BLCG 0x840
+#define SSPX_CORE_CNT0 0x610
+#define SSPX_CORE_CNT0_PING_TBURST_MASK GENMASK(7, 0)
+#define SSPX_CORE_CNT0_PING_TBURST(x) ((x) & SSPX_CORE_CNT0_PING_TBURST_MASK)
+#define SSPX_CORE_CNT30 0x688
+#define SSPX_CORE_CNT30_LMPITP_TIMER_MASK GENMASK(19, 0)
+#define SSPX_CORE_CNT30_LMPITP_TIMER(x) ((x) & \
+ SSPX_CORE_CNT30_LMPITP_TIMER_MASK)
+#define SSPX_CORE_CNT32 0x690
+#define SSPX_CORE_CNT32_POLL_TBURST_MAX_MASK GENMASK(7, 0)
+#define SSPX_CORE_CNT32_POLL_TBURST_MAX(x) ((x) & \
+ SSPX_CORE_CNT32_POLL_TBURST_MAX_MASK)
+#define SSPX_CORE_PADCTL4 0x750
+#define SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_MASK GENMASK(19, 0)
+#define SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3(x) ((x) & \
+ SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_MASK)
+#define BLCG_DFPCI BIT(0)
+#define BLCG_UFPCI BIT(1)
+#define BLCG_FE BIT(2)
+#define BLCG_COREPLL_PWRDN BIT(8)
+#define BLCG_IOPLL_0_PWRDN BIT(9)
+#define BLCG_IOPLL_1_PWRDN BIT(10)
+#define BLCG_IOPLL_2_PWRDN BIT(11)
+#define BLCG_ALL 0x1ff
+#define CFG_DEV_SSPI_XFER 0x858
+#define CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK GENMASK(31, 0)
+#define CFG_DEV_SSPI_XFER_ACKTIMEOUT(x) ((x) & \
+ CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK)
+#define CFG_DEV_FE 0x85c
+#define CFG_DEV_FE_PORTREGSEL_MASK GENMASK(1, 0)
+#define CFG_DEV_FE_PORTREGSEL_SS_PI 1
+#define CFG_DEV_FE_PORTREGSEL_HSFS_PI 2
+#define CFG_DEV_FE_PORTREGSEL(x) ((x) & CFG_DEV_FE_PORTREGSEL_MASK)
+#define CFG_DEV_FE_INFINITE_SS_RETRY BIT(29)
+
+/* FPCI registers */
+#define XUSB_DEV_CFG_1 0x004
+#define XUSB_DEV_CFG_1_IO_SPACE_EN BIT(0)
+#define XUSB_DEV_CFG_1_MEMORY_SPACE_EN BIT(1)
+#define XUSB_DEV_CFG_1_BUS_MASTER_EN BIT(2)
+#define XUSB_DEV_CFG_4 0x010
+#define XUSB_DEV_CFG_4_BASE_ADDR_MASK GENMASK(31, 15)
+#define XUSB_DEV_CFG_5 0x014
+
+/* IPFS registers */
+#define XUSB_DEV_CONFIGURATION_0 0x180
+#define XUSB_DEV_CONFIGURATION_0_EN_FPCI BIT(0)
+#define XUSB_DEV_INTR_MASK_0 0x188
+#define XUSB_DEV_INTR_MASK_0_IP_INT_MASK BIT(16)
+
+struct tegra_xudc_ep_context {
+ __le32 info0;
+ __le32 info1;
+ __le32 deq_lo;
+ __le32 deq_hi;
+ __le32 tx_info;
+ __le32 rsvd[11];
+};
+
+#define EP_STATE_DISABLED 0
+#define EP_STATE_RUNNING 1
+#define EP_STATE_HALTED 2
+#define EP_STATE_STOPPED 3
+#define EP_STATE_ERROR 4
+
+#define EP_TYPE_INVALID 0
+#define EP_TYPE_ISOCH_OUT 1
+#define EP_TYPE_BULK_OUT 2
+#define EP_TYPE_INTERRUPT_OUT 3
+#define EP_TYPE_CONTROL 4
+#define EP_TYPE_ISCOH_IN 5
+#define EP_TYPE_BULK_IN 6
+#define EP_TYPE_INTERRUPT_IN 7
+
+#define BUILD_EP_CONTEXT_RW(name, member, shift, mask) \
+static inline u32 ep_ctx_read_##name(struct tegra_xudc_ep_context *ctx) \
+{ \
+ return (le32_to_cpu(ctx->member) >> (shift)) & (mask); \
+} \
+static inline void \
+ep_ctx_write_##name(struct tegra_xudc_ep_context *ctx, u32 val) \
+{ \
+ u32 tmp; \
+ \
+ tmp = le32_to_cpu(ctx->member) & ~((mask) << (shift)); \
+ tmp |= (val & (mask)) << (shift); \
+ ctx->member = cpu_to_le32(tmp); \
+}
+
+BUILD_EP_CONTEXT_RW(state, info0, 0, 0x7)
+BUILD_EP_CONTEXT_RW(mult, info0, 8, 0x3)
+BUILD_EP_CONTEXT_RW(max_pstreams, info0, 10, 0x1f)
+BUILD_EP_CONTEXT_RW(lsa, info0, 15, 0x1)
+BUILD_EP_CONTEXT_RW(interval, info0, 16, 0xff)
+BUILD_EP_CONTEXT_RW(cerr, info1, 1, 0x3)
+BUILD_EP_CONTEXT_RW(type, info1, 3, 0x7)
+BUILD_EP_CONTEXT_RW(hid, info1, 7, 0x1)
+BUILD_EP_CONTEXT_RW(max_burst_size, info1, 8, 0xff)
+BUILD_EP_CONTEXT_RW(max_packet_size, info1, 16, 0xffff)
+BUILD_EP_CONTEXT_RW(dcs, deq_lo, 0, 0x1)
+BUILD_EP_CONTEXT_RW(deq_lo, deq_lo, 4, 0xfffffff)
+BUILD_EP_CONTEXT_RW(deq_hi, deq_hi, 0, 0xffffffff)
+BUILD_EP_CONTEXT_RW(avg_trb_len, tx_info, 0, 0xffff)
+BUILD_EP_CONTEXT_RW(max_esit_payload, tx_info, 16, 0xffff)
+BUILD_EP_CONTEXT_RW(edtla, rsvd[0], 0, 0xffffff)
+BUILD_EP_CONTEXT_RW(seq_num, rsvd[0], 24, 0xff)
+BUILD_EP_CONTEXT_RW(partial_td, rsvd[0], 25, 0x1)
+BUILD_EP_CONTEXT_RW(cerrcnt, rsvd[1], 18, 0x3)
+BUILD_EP_CONTEXT_RW(data_offset, rsvd[2], 0, 0x1ffff)
+BUILD_EP_CONTEXT_RW(numtrbs, rsvd[2], 22, 0x1f)
+BUILD_EP_CONTEXT_RW(devaddr, rsvd[6], 0, 0x7f)
+
+static inline u64 ep_ctx_read_deq_ptr(struct tegra_xudc_ep_context *ctx)
+{
+ return ((u64)ep_ctx_read_deq_hi(ctx) << 32) |
+ (ep_ctx_read_deq_lo(ctx) << 4);
+}
+
+static inline void
+ep_ctx_write_deq_ptr(struct tegra_xudc_ep_context *ctx, u64 addr)
+{
+ ep_ctx_write_deq_lo(ctx, lower_32_bits(addr) >> 4);
+ ep_ctx_write_deq_hi(ctx, upper_32_bits(addr));
+}
+
+struct tegra_xudc_trb {
+ __le32 data_lo;
+ __le32 data_hi;
+ __le32 status;
+ __le32 control;
+};
+
+#define TRB_TYPE_RSVD 0
+#define TRB_TYPE_NORMAL 1
+#define TRB_TYPE_SETUP_STAGE 2
+#define TRB_TYPE_DATA_STAGE 3
+#define TRB_TYPE_STATUS_STAGE 4
+#define TRB_TYPE_ISOCH 5
+#define TRB_TYPE_LINK 6
+#define TRB_TYPE_TRANSFER_EVENT 32
+#define TRB_TYPE_PORT_STATUS_CHANGE_EVENT 34
+#define TRB_TYPE_STREAM 48
+#define TRB_TYPE_SETUP_PACKET_EVENT 63
+
+#define TRB_CMPL_CODE_INVALID 0
+#define TRB_CMPL_CODE_SUCCESS 1
+#define TRB_CMPL_CODE_DATA_BUFFER_ERR 2
+#define TRB_CMPL_CODE_BABBLE_DETECTED_ERR 3
+#define TRB_CMPL_CODE_USB_TRANS_ERR 4
+#define TRB_CMPL_CODE_TRB_ERR 5
+#define TRB_CMPL_CODE_STALL 6
+#define TRB_CMPL_CODE_INVALID_STREAM_TYPE_ERR 10
+#define TRB_CMPL_CODE_SHORT_PACKET 13
+#define TRB_CMPL_CODE_RING_UNDERRUN 14
+#define TRB_CMPL_CODE_RING_OVERRUN 15
+#define TRB_CMPL_CODE_EVENT_RING_FULL_ERR 21
+#define TRB_CMPL_CODE_STOPPED 26
+#define TRB_CMPL_CODE_ISOCH_BUFFER_OVERRUN 31
+#define TRB_CMPL_CODE_STREAM_NUMP_ERROR 219
+#define TRB_CMPL_CODE_PRIME_PIPE_RECEIVED 220
+#define TRB_CMPL_CODE_HOST_REJECTED 221
+#define TRB_CMPL_CODE_CTRL_DIR_ERR 222
+#define TRB_CMPL_CODE_CTRL_SEQNUM_ERR 223
+
+#define BUILD_TRB_RW(name, member, shift, mask) \
+static inline u32 trb_read_##name(struct tegra_xudc_trb *trb) \
+{ \
+ return (le32_to_cpu(trb->member) >> (shift)) & (mask); \
+} \
+static inline void \
+trb_write_##name(struct tegra_xudc_trb *trb, u32 val) \
+{ \
+ u32 tmp; \
+ \
+ tmp = le32_to_cpu(trb->member) & ~((mask) << (shift)); \
+ tmp |= (val & (mask)) << (shift); \
+ trb->member = cpu_to_le32(tmp); \
+}
+
+BUILD_TRB_RW(data_lo, data_lo, 0, 0xffffffff)
+BUILD_TRB_RW(data_hi, data_hi, 0, 0xffffffff)
+BUILD_TRB_RW(seq_num, status, 0, 0xffff)
+BUILD_TRB_RW(transfer_len, status, 0, 0xffffff)
+BUILD_TRB_RW(td_size, status, 17, 0x1f)
+BUILD_TRB_RW(cmpl_code, status, 24, 0xff)
+BUILD_TRB_RW(cycle, control, 0, 0x1)
+BUILD_TRB_RW(toggle_cycle, control, 1, 0x1)
+BUILD_TRB_RW(isp, control, 2, 0x1)
+BUILD_TRB_RW(chain, control, 4, 0x1)
+BUILD_TRB_RW(ioc, control, 5, 0x1)
+BUILD_TRB_RW(type, control, 10, 0x3f)
+BUILD_TRB_RW(stream_id, control, 16, 0xffff)
+BUILD_TRB_RW(endpoint_id, control, 16, 0x1f)
+BUILD_TRB_RW(tlbpc, control, 16, 0xf)
+BUILD_TRB_RW(data_stage_dir, control, 16, 0x1)
+BUILD_TRB_RW(frame_id, control, 20, 0x7ff)
+BUILD_TRB_RW(sia, control, 31, 0x1)
+
+static inline u64 trb_read_data_ptr(struct tegra_xudc_trb *trb)
+{
+ return ((u64)trb_read_data_hi(trb) << 32) |
+ trb_read_data_lo(trb);
+}
+
+static inline void trb_write_data_ptr(struct tegra_xudc_trb *trb, u64 addr)
+{
+ trb_write_data_lo(trb, lower_32_bits(addr));
+ trb_write_data_hi(trb, upper_32_bits(addr));
+}
+
+struct tegra_xudc_request {
+ struct usb_request usb_req;
+
+ size_t buf_queued;
+ unsigned int trbs_queued;
+ unsigned int trbs_needed;
+ bool need_zlp;
+
+ struct tegra_xudc_trb *first_trb;
+ struct tegra_xudc_trb *last_trb;
+
+ struct list_head list;
+};
+
+struct tegra_xudc_ep {
+ struct tegra_xudc *xudc;
+ struct usb_ep usb_ep;
+ unsigned int index;
+ char name[8];
+
+ struct tegra_xudc_ep_context *context;
+
+#define XUDC_TRANSFER_RING_SIZE 64
+ struct tegra_xudc_trb *transfer_ring;
+ dma_addr_t transfer_ring_phys;
+
+ unsigned int enq_ptr;
+ unsigned int deq_ptr;
+ bool pcs;
+ bool ring_full;
+ bool stream_rejected;
+
+ struct list_head queue;
+ const struct usb_endpoint_descriptor *desc;
+ const struct usb_ss_ep_comp_descriptor *comp_desc;
+};
+
+struct tegra_xudc_sel_timing {
+ __u8 u1sel;
+ __u8 u1pel;
+ __le16 u2sel;
+ __le16 u2pel;
+};
+
+enum tegra_xudc_setup_state {
+ WAIT_FOR_SETUP,
+ DATA_STAGE_XFER,
+ DATA_STAGE_RECV,
+ STATUS_STAGE_XFER,
+ STATUS_STAGE_RECV,
+};
+
+struct tegra_xudc_setup_packet {
+ struct usb_ctrlrequest ctrl_req;
+ unsigned int seq_num;
+};
+
+struct tegra_xudc_save_regs {
+ u32 ctrl;
+ u32 portpm;
+};
+
+struct tegra_xudc {
+ struct device *dev;
+ const struct tegra_xudc_soc *soc;
+ struct tegra_xusb_padctl *padctl;
+
+ spinlock_t lock;
+
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+
+#define XUDC_NR_EVENT_RINGS 2
+#define XUDC_EVENT_RING_SIZE 4096
+ struct tegra_xudc_trb *event_ring[XUDC_NR_EVENT_RINGS];
+ dma_addr_t event_ring_phys[XUDC_NR_EVENT_RINGS];
+ unsigned int event_ring_index;
+ unsigned int event_ring_deq_ptr;
+ bool ccs;
+
+#define XUDC_NR_EPS 32
+ struct tegra_xudc_ep ep[XUDC_NR_EPS];
+ struct tegra_xudc_ep_context *ep_context;
+ dma_addr_t ep_context_phys;
+
+ struct device *genpd_dev_device;
+ struct device *genpd_dev_ss;
+ struct device_link *genpd_dl_device;
+ struct device_link *genpd_dl_ss;
+
+ struct dma_pool *transfer_ring_pool;
+
+ bool queued_setup_packet;
+ struct tegra_xudc_setup_packet setup_packet;
+ enum tegra_xudc_setup_state setup_state;
+ u16 setup_seq_num;
+
+ u16 dev_addr;
+ u16 isoch_delay;
+ struct tegra_xudc_sel_timing sel_timing;
+ u8 test_mode_pattern;
+ u16 status_buf;
+ struct tegra_xudc_request *ep0_req;
+
+ bool pullup;
+
+ unsigned int nr_enabled_eps;
+ unsigned int nr_isoch_eps;
+
+ unsigned int device_state;
+ unsigned int resume_state;
+
+ int irq;
+
+ void __iomem *base;
+ resource_size_t phys_base;
+ void __iomem *ipfs;
+ void __iomem *fpci;
+
+ struct regulator_bulk_data *supplies;
+
+ struct clk_bulk_data *clks;
+
+ enum usb_role device_mode;
+ struct usb_role_switch *usb_role_sw;
+ struct work_struct usb_role_sw_work;
+
+ struct phy *usb3_phy;
+ struct phy *utmi_phy;
+
+ struct tegra_xudc_save_regs saved_regs;
+ bool suspended;
+ bool powergated;
+
+ struct completion disconnect_complete;
+
+ bool selfpowered;
+
+#define TOGGLE_VBUS_WAIT_MS 100
+ struct delayed_work plc_reset_work;
+ bool wait_csc;
+
+ struct delayed_work port_reset_war_work;
+ bool wait_for_sec_prc;
+};
+
+#define XUDC_TRB_MAX_BUFFER_SIZE 65536
+#define XUDC_MAX_ISOCH_EPS 4
+#define XUDC_INTERRUPT_MODERATION_US 0
+
+static struct usb_endpoint_descriptor tegra_xudc_ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .wMaxPacketSize = cpu_to_le16(64),
+};
+
+struct tegra_xudc_soc {
+ const char * const *supply_names;
+ unsigned int num_supplies;
+ const char * const *clock_names;
+ unsigned int num_clks;
+ bool u1_enable;
+ bool u2_enable;
+ bool lpm_enable;
+ bool invalid_seq_num;
+ bool pls_quirk;
+ bool port_reset_quirk;
+ bool has_ipfs;
+};
+
+static inline u32 fpci_readl(struct tegra_xudc *xudc, unsigned int offset)
+{
+ return readl(xudc->fpci + offset);
+}
+
+static inline void fpci_writel(struct tegra_xudc *xudc, u32 val,
+ unsigned int offset)
+{
+ writel(val, xudc->fpci + offset);
+}
+
+static inline u32 ipfs_readl(struct tegra_xudc *xudc, unsigned int offset)
+{
+ return readl(xudc->ipfs + offset);
+}
+
+static inline void ipfs_writel(struct tegra_xudc *xudc, u32 val,
+ unsigned int offset)
+{
+ writel(val, xudc->ipfs + offset);
+}
+
+static inline u32 xudc_readl(struct tegra_xudc *xudc, unsigned int offset)
+{
+ return readl(xudc->base + offset);
+}
+
+static inline void xudc_writel(struct tegra_xudc *xudc, u32 val,
+ unsigned int offset)
+{
+ writel(val, xudc->base + offset);
+}
+
+static inline int xudc_readl_poll(struct tegra_xudc *xudc,
+ unsigned int offset, u32 mask, u32 val)
+{
+ u32 regval;
+
+ return readl_poll_timeout_atomic(xudc->base + offset, regval,
+ (regval & mask) == val, 1, 100);
+}
+
+static inline struct tegra_xudc *to_xudc(struct usb_gadget *gadget)
+{
+ return container_of(gadget, struct tegra_xudc, gadget);
+}
+
+static inline struct tegra_xudc_ep *to_xudc_ep(struct usb_ep *ep)
+{
+ return container_of(ep, struct tegra_xudc_ep, usb_ep);
+}
+
+static inline struct tegra_xudc_request *to_xudc_req(struct usb_request *req)
+{
+ return container_of(req, struct tegra_xudc_request, usb_req);
+}
+
+static inline void dump_trb(struct tegra_xudc *xudc, const char *type,
+ struct tegra_xudc_trb *trb)
+{
+ dev_dbg(xudc->dev,
+ "%s: %p, lo = %#x, hi = %#x, status = %#x, control = %#x\n",
+ type, trb, trb->data_lo, trb->data_hi, trb->status,
+ trb->control);
+}
+
+static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
+{
+ int err;
+
+ pm_runtime_get_sync(xudc->dev);
+
+ err = phy_power_on(xudc->utmi_phy);
+ if (err < 0)
+ dev_err(xudc->dev, "utmi power on failed %d\n", err);
+
+ err = phy_power_on(xudc->usb3_phy);
+ if (err < 0)
+ dev_err(xudc->dev, "usb3 phy power on failed %d\n", err);
+
+ dev_dbg(xudc->dev, "device mode on\n");
+
+ tegra_xusb_padctl_set_vbus_override(xudc->padctl, true);
+
+ xudc->device_mode = USB_ROLE_DEVICE;
+}
+
+static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
+{
+ bool connected = false;
+ u32 pls, val;
+ int err;
+
+ dev_dbg(xudc->dev, "device mode off\n");
+
+ connected = !!(xudc_readl(xudc, PORTSC) & PORTSC_CCS);
+
+ reinit_completion(&xudc->disconnect_complete);
+
+ tegra_xusb_padctl_set_vbus_override(xudc->padctl, false);
+
+ pls = (xudc_readl(xudc, PORTSC) & PORTSC_PLS_MASK) >>
+ PORTSC_PLS_SHIFT;
+
+ /* Direct link to U0 if disconnected in RESUME or U2. */
+ if (xudc->soc->pls_quirk && xudc->gadget.speed == USB_SPEED_SUPER &&
+ (pls == PORTSC_PLS_RESUME || pls == PORTSC_PLS_U2)) {
+ val = xudc_readl(xudc, PORTPM);
+ val |= PORTPM_FRWE;
+ xudc_writel(xudc, val, PORTPM);
+
+ val = xudc_readl(xudc, PORTSC);
+ val &= ~(PORTSC_CHANGE_MASK | PORTSC_PLS_MASK);
+ val |= PORTSC_LWS | PORTSC_PLS(PORTSC_PLS_U0);
+ xudc_writel(xudc, val, PORTSC);
+ }
+
+ xudc->device_mode = USB_ROLE_NONE;
+
+ /* Wait for disconnect event. */
+ if (connected)
+ wait_for_completion(&xudc->disconnect_complete);
+
+ /* Make sure interrupt handler has completed before powergating. */
+ synchronize_irq(xudc->irq);
+
+ err = phy_power_off(xudc->utmi_phy);
+ if (err < 0)
+ dev_err(xudc->dev, "utmi_phy power off failed %d\n", err);
+
+ err = phy_power_off(xudc->usb3_phy);
+ if (err < 0)
+ dev_err(xudc->dev, "usb3_phy power off failed %d\n", err);
+
+ pm_runtime_put(xudc->dev);
+}
+
+static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
+{
+ struct tegra_xudc *xudc = container_of(work, struct tegra_xudc,
+ usb_role_sw_work);
+
+ if (!xudc->usb_role_sw ||
+ usb_role_switch_get_role(xudc->usb_role_sw) == USB_ROLE_DEVICE)
+ tegra_xudc_device_mode_on(xudc);
+ else
+ tegra_xudc_device_mode_off(xudc);
+
+}
+
+static int tegra_xudc_usb_role_sw_set(struct device *dev, enum usb_role role)
+{
+ struct tegra_xudc *xudc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ dev_dbg(dev, "%s role is %d\n", __func__, role);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (!xudc->suspended)
+ schedule_work(&xudc->usb_role_sw_work);
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return 0;
+}
+
+static void tegra_xudc_plc_reset_work(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct tegra_xudc *xudc = container_of(dwork, struct tegra_xudc,
+ plc_reset_work);
+ unsigned long flags;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (xudc->wait_csc) {
+ u32 pls = (xudc_readl(xudc, PORTSC) & PORTSC_PLS_MASK) >>
+ PORTSC_PLS_SHIFT;
+
+ if (pls == PORTSC_PLS_INACTIVE) {
+ dev_info(xudc->dev, "PLS = Inactive. Toggle VBUS\n");
+ tegra_xusb_padctl_set_vbus_override(xudc->padctl,
+ false);
+ tegra_xusb_padctl_set_vbus_override(xudc->padctl, true);
+ xudc->wait_csc = false;
+ }
+ }
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+}
+
+static void tegra_xudc_port_reset_war_work(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct tegra_xudc *xudc =
+ container_of(dwork, struct tegra_xudc, port_reset_war_work);
+ unsigned long flags;
+ u32 pls;
+ int ret;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if ((xudc->device_mode == USB_ROLE_DEVICE)
+ && xudc->wait_for_sec_prc) {
+ pls = (xudc_readl(xudc, PORTSC) & PORTSC_PLS_MASK) >>
+ PORTSC_PLS_SHIFT;
+ dev_dbg(xudc->dev, "pls = %x\n", pls);
+
+ if (pls == PORTSC_PLS_DISABLED) {
+ dev_dbg(xudc->dev, "toggle vbus\n");
+ /* PRC doesn't complete in 100ms, toggle the vbus */
+ ret = tegra_phy_xusb_utmi_port_reset(xudc->utmi_phy);
+ if (ret == 1)
+ xudc->wait_for_sec_prc = 0;
+ }
+ }
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+}
+
+static dma_addr_t trb_virt_to_phys(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_trb *trb)
+{
+ unsigned int index;
+
+ index = trb - ep->transfer_ring;
+
+ if (WARN_ON(index >= XUDC_TRANSFER_RING_SIZE))
+ return 0;
+
+ return (ep->transfer_ring_phys + index * sizeof(*trb));
+}
+
+static struct tegra_xudc_trb *trb_phys_to_virt(struct tegra_xudc_ep *ep,
+ dma_addr_t addr)
+{
+ struct tegra_xudc_trb *trb;
+ unsigned int index;
+
+ index = (addr - ep->transfer_ring_phys) / sizeof(*trb);
+
+ if (WARN_ON(index >= XUDC_TRANSFER_RING_SIZE))
+ return NULL;
+
+ trb = &ep->transfer_ring[index];
+
+ return trb;
+}
+
+static void ep_reload(struct tegra_xudc *xudc, unsigned int ep)
+{
+ xudc_writel(xudc, BIT(ep), EP_RELOAD);
+ xudc_readl_poll(xudc, EP_RELOAD, BIT(ep), 0);
+}
+
+static void ep_pause(struct tegra_xudc *xudc, unsigned int ep)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_PAUSE);
+ if (val & BIT(ep))
+ return;
+ val |= BIT(ep);
+
+ xudc_writel(xudc, val, EP_PAUSE);
+
+ xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
+
+ xudc_writel(xudc, BIT(ep), EP_STCHG);
+}
+
+static void ep_unpause(struct tegra_xudc *xudc, unsigned int ep)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_PAUSE);
+ if (!(val & BIT(ep)))
+ return;
+ val &= ~BIT(ep);
+
+ xudc_writel(xudc, val, EP_PAUSE);
+
+ xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
+
+ xudc_writel(xudc, BIT(ep), EP_STCHG);
+}
+
+static void ep_unpause_all(struct tegra_xudc *xudc)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_PAUSE);
+
+ xudc_writel(xudc, 0, EP_PAUSE);
+
+ xudc_readl_poll(xudc, EP_STCHG, val, val);
+
+ xudc_writel(xudc, val, EP_STCHG);
+}
+
+static void ep_halt(struct tegra_xudc *xudc, unsigned int ep)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_HALT);
+ if (val & BIT(ep))
+ return;
+ val |= BIT(ep);
+ xudc_writel(xudc, val, EP_HALT);
+
+ xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
+
+ xudc_writel(xudc, BIT(ep), EP_STCHG);
+}
+
+static void ep_unhalt(struct tegra_xudc *xudc, unsigned int ep)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_HALT);
+ if (!(val & BIT(ep)))
+ return;
+ val &= ~BIT(ep);
+ xudc_writel(xudc, val, EP_HALT);
+
+ xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
+
+ xudc_writel(xudc, BIT(ep), EP_STCHG);
+}
+
+static void ep_unhalt_all(struct tegra_xudc *xudc)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, EP_HALT);
+ if (!val)
+ return;
+ xudc_writel(xudc, 0, EP_HALT);
+
+ xudc_readl_poll(xudc, EP_STCHG, val, val);
+
+ xudc_writel(xudc, val, EP_STCHG);
+}
+
+static void ep_wait_for_stopped(struct tegra_xudc *xudc, unsigned int ep)
+{
+ xudc_readl_poll(xudc, EP_STOPPED, BIT(ep), BIT(ep));
+ xudc_writel(xudc, BIT(ep), EP_STOPPED);
+}
+
+static void ep_wait_for_inactive(struct tegra_xudc *xudc, unsigned int ep)
+{
+ xudc_readl_poll(xudc, EP_THREAD_ACTIVE, BIT(ep), 0);
+}
+
+static void tegra_xudc_req_done(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req, int status)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+
+ dev_dbg(xudc->dev, "completing request %p on EP %u with status %d\n",
+ req, ep->index, status);
+
+ if (likely(req->usb_req.status == -EINPROGRESS))
+ req->usb_req.status = status;
+
+ list_del_init(&req->list);
+
+ if (usb_endpoint_xfer_control(ep->desc)) {
+ usb_gadget_unmap_request(&xudc->gadget, &req->usb_req,
+ (xudc->setup_state ==
+ DATA_STAGE_XFER));
+ } else {
+ usb_gadget_unmap_request(&xudc->gadget, &req->usb_req,
+ usb_endpoint_dir_in(ep->desc));
+ }
+
+ spin_unlock(&xudc->lock);
+ usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
+ spin_lock(&xudc->lock);
+}
+
+static void tegra_xudc_ep_nuke(struct tegra_xudc_ep *ep, int status)
+{
+ struct tegra_xudc_request *req;
+
+ while (!list_empty(&ep->queue)) {
+ req = list_first_entry(&ep->queue, struct tegra_xudc_request,
+ list);
+ tegra_xudc_req_done(ep, req, status);
+ }
+}
+
+static unsigned int ep_available_trbs(struct tegra_xudc_ep *ep)
+{
+ if (ep->ring_full)
+ return 0;
+
+ if (ep->deq_ptr > ep->enq_ptr)
+ return ep->deq_ptr - ep->enq_ptr - 1;
+
+ return XUDC_TRANSFER_RING_SIZE - (ep->enq_ptr - ep->deq_ptr) - 2;
+}
+
+static void tegra_xudc_queue_one_trb(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req,
+ struct tegra_xudc_trb *trb,
+ bool ioc)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+ dma_addr_t buf_addr;
+ size_t len;
+
+ len = min_t(size_t, XUDC_TRB_MAX_BUFFER_SIZE, req->usb_req.length -
+ req->buf_queued);
+ if (len > 0)
+ buf_addr = req->usb_req.dma + req->buf_queued;
+ else
+ buf_addr = 0;
+
+ trb_write_data_ptr(trb, buf_addr);
+
+ trb_write_transfer_len(trb, len);
+ trb_write_td_size(trb, req->trbs_needed - req->trbs_queued - 1);
+
+ if (req->trbs_queued == req->trbs_needed - 1 ||
+ (req->need_zlp && req->trbs_queued == req->trbs_needed - 2))
+ trb_write_chain(trb, 0);
+ else
+ trb_write_chain(trb, 1);
+
+ trb_write_ioc(trb, ioc);
+
+ if (usb_endpoint_dir_out(ep->desc) ||
+ (usb_endpoint_xfer_control(ep->desc) &&
+ (xudc->setup_state == DATA_STAGE_RECV)))
+ trb_write_isp(trb, 1);
+ else
+ trb_write_isp(trb, 0);
+
+ if (usb_endpoint_xfer_control(ep->desc)) {
+ if (xudc->setup_state == DATA_STAGE_XFER ||
+ xudc->setup_state == DATA_STAGE_RECV)
+ trb_write_type(trb, TRB_TYPE_DATA_STAGE);
+ else
+ trb_write_type(trb, TRB_TYPE_STATUS_STAGE);
+
+ if (xudc->setup_state == DATA_STAGE_XFER ||
+ xudc->setup_state == STATUS_STAGE_XFER)
+ trb_write_data_stage_dir(trb, 1);
+ else
+ trb_write_data_stage_dir(trb, 0);
+ } else if (usb_endpoint_xfer_isoc(ep->desc)) {
+ trb_write_type(trb, TRB_TYPE_ISOCH);
+ trb_write_sia(trb, 1);
+ trb_write_frame_id(trb, 0);
+ trb_write_tlbpc(trb, 0);
+ } else if (usb_ss_max_streams(ep->comp_desc)) {
+ trb_write_type(trb, TRB_TYPE_STREAM);
+ trb_write_stream_id(trb, req->usb_req.stream_id);
+ } else {
+ trb_write_type(trb, TRB_TYPE_NORMAL);
+ trb_write_stream_id(trb, 0);
+ }
+
+ trb_write_cycle(trb, ep->pcs);
+
+ req->trbs_queued++;
+ req->buf_queued += len;
+
+ dump_trb(xudc, "TRANSFER", trb);
+}
+
+static unsigned int tegra_xudc_queue_trbs(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req)
+{
+ unsigned int i, count, available;
+ bool wait_td = false;
+
+ available = ep_available_trbs(ep);
+ count = req->trbs_needed - req->trbs_queued;
+ if (available < count) {
+ count = available;
+ ep->ring_full = true;
+ }
+
+ /*
+ * To generate zero-length packet on USB bus, SW needs schedule a
+ * standalone zero-length TD. According to HW's behavior, SW needs
+ * to schedule TDs in different ways for different endpoint types.
+ *
+ * For control endpoint:
+ * - Data stage TD (IOC = 1, CH = 0)
+ * - Ring doorbell and wait transfer event
+ * - Data stage TD for ZLP (IOC = 1, CH = 0)
+ * - Ring doorbell
+ *
+ * For bulk and interrupt endpoints:
+ * - Normal transfer TD (IOC = 0, CH = 0)
+ * - Normal transfer TD for ZLP (IOC = 1, CH = 0)
+ * - Ring doorbell
+ */
+
+ if (req->need_zlp && usb_endpoint_xfer_control(ep->desc) && count > 1)
+ wait_td = true;
+
+ if (!req->first_trb)
+ req->first_trb = &ep->transfer_ring[ep->enq_ptr];
+
+ for (i = 0; i < count; i++) {
+ struct tegra_xudc_trb *trb = &ep->transfer_ring[ep->enq_ptr];
+ bool ioc = false;
+
+ if ((i == count - 1) || (wait_td && i == count - 2))
+ ioc = true;
+
+ tegra_xudc_queue_one_trb(ep, req, trb, ioc);
+ req->last_trb = trb;
+
+ ep->enq_ptr++;
+ if (ep->enq_ptr == XUDC_TRANSFER_RING_SIZE - 1) {
+ trb = &ep->transfer_ring[ep->enq_ptr];
+ trb_write_cycle(trb, ep->pcs);
+ ep->pcs = !ep->pcs;
+ ep->enq_ptr = 0;
+ }
+
+ if (ioc)
+ break;
+ }
+
+ return count;
+}
+
+static void tegra_xudc_ep_ring_doorbell(struct tegra_xudc_ep *ep)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+ u32 val;
+
+ if (list_empty(&ep->queue))
+ return;
+
+ val = DB_TARGET(ep->index);
+ if (usb_endpoint_xfer_control(ep->desc)) {
+ val |= DB_STREAMID(xudc->setup_seq_num);
+ } else if (usb_ss_max_streams(ep->comp_desc) > 0) {
+ struct tegra_xudc_request *req;
+
+ /* Don't ring doorbell if the stream has been rejected. */
+ if (ep->stream_rejected)
+ return;
+
+ req = list_first_entry(&ep->queue, struct tegra_xudc_request,
+ list);
+ val |= DB_STREAMID(req->usb_req.stream_id);
+ }
+
+ dev_dbg(xudc->dev, "ring doorbell: %#x\n", val);
+ xudc_writel(xudc, val, DB);
+}
+
+static void tegra_xudc_ep_kick_queue(struct tegra_xudc_ep *ep)
+{
+ struct tegra_xudc_request *req;
+ bool trbs_queued = false;
+
+ list_for_each_entry(req, &ep->queue, list) {
+ if (ep->ring_full)
+ break;
+
+ if (tegra_xudc_queue_trbs(ep, req) > 0)
+ trbs_queued = true;
+ }
+
+ if (trbs_queued)
+ tegra_xudc_ep_ring_doorbell(ep);
+}
+
+static int
+__tegra_xudc_ep_queue(struct tegra_xudc_ep *ep, struct tegra_xudc_request *req)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+ int err;
+
+ if (usb_endpoint_xfer_control(ep->desc) && !list_empty(&ep->queue)) {
+ dev_err(xudc->dev, "control EP has pending transfers\n");
+ return -EINVAL;
+ }
+
+ if (usb_endpoint_xfer_control(ep->desc)) {
+ err = usb_gadget_map_request(&xudc->gadget, &req->usb_req,
+ (xudc->setup_state ==
+ DATA_STAGE_XFER));
+ } else {
+ err = usb_gadget_map_request(&xudc->gadget, &req->usb_req,
+ usb_endpoint_dir_in(ep->desc));
+ }
+
+ if (err < 0) {
+ dev_err(xudc->dev, "failed to map request: %d\n", err);
+ return err;
+ }
+
+ req->first_trb = NULL;
+ req->last_trb = NULL;
+ req->buf_queued = 0;
+ req->trbs_queued = 0;
+ req->need_zlp = false;
+ req->trbs_needed = DIV_ROUND_UP(req->usb_req.length,
+ XUDC_TRB_MAX_BUFFER_SIZE);
+ if (req->usb_req.length == 0)
+ req->trbs_needed++;
+
+ if (!usb_endpoint_xfer_isoc(ep->desc) &&
+ req->usb_req.zero && req->usb_req.length &&
+ ((req->usb_req.length % ep->usb_ep.maxpacket) == 0)) {
+ req->trbs_needed++;
+ req->need_zlp = true;
+ }
+
+ req->usb_req.status = -EINPROGRESS;
+ req->usb_req.actual = 0;
+
+ list_add_tail(&req->list, &ep->queue);
+
+ tegra_xudc_ep_kick_queue(ep);
+
+ return 0;
+}
+
+static int
+tegra_xudc_ep_queue(struct usb_ep *usb_ep, struct usb_request *usb_req,
+ gfp_t gfp)
+{
+ struct tegra_xudc_request *req;
+ struct tegra_xudc_ep *ep;
+ struct tegra_xudc *xudc;
+ unsigned long flags;
+ int ret;
+
+ if (!usb_ep || !usb_req)
+ return -EINVAL;
+
+ ep = to_xudc_ep(usb_ep);
+ req = to_xudc_req(usb_req);
+ xudc = ep->xudc;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ if (xudc->powergated || !ep->desc) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ ret = __tegra_xudc_ep_queue(ep, req);
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static void squeeze_transfer_ring(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req)
+{
+ struct tegra_xudc_trb *trb = req->first_trb;
+ bool pcs_enq = trb_read_cycle(trb);
+ bool pcs;
+
+ /*
+ * Clear out all the TRBs part of or after the cancelled request,
+ * and must correct trb cycle bit to the last un-enqueued state.
+ */
+ while (trb != &ep->transfer_ring[ep->enq_ptr]) {
+ pcs = trb_read_cycle(trb);
+ memset(trb, 0, sizeof(*trb));
+ trb_write_cycle(trb, !pcs);
+ trb++;
+
+ if (trb_read_type(trb) == TRB_TYPE_LINK)
+ trb = ep->transfer_ring;
+ }
+
+ /* Requests will be re-queued at the start of the cancelled request. */
+ ep->enq_ptr = req->first_trb - ep->transfer_ring;
+ /*
+ * Retrieve the correct cycle bit state from the first trb of
+ * the cancelled request.
+ */
+ ep->pcs = pcs_enq;
+ ep->ring_full = false;
+ list_for_each_entry_continue(req, &ep->queue, list) {
+ req->usb_req.status = -EINPROGRESS;
+ req->usb_req.actual = 0;
+
+ req->first_trb = NULL;
+ req->last_trb = NULL;
+ req->buf_queued = 0;
+ req->trbs_queued = 0;
+ }
+}
+
+/*
+ * Determine if the given TRB is in the range [first trb, last trb] for the
+ * given request.
+ */
+static bool trb_in_request(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req,
+ struct tegra_xudc_trb *trb)
+{
+ dev_dbg(ep->xudc->dev, "%s: request %p -> %p; trb %p\n", __func__,
+ req->first_trb, req->last_trb, trb);
+
+ if (trb >= req->first_trb && (trb <= req->last_trb ||
+ req->last_trb < req->first_trb))
+ return true;
+
+ if (trb < req->first_trb && trb <= req->last_trb &&
+ req->last_trb < req->first_trb)
+ return true;
+
+ return false;
+}
+
+/*
+ * Determine if the given TRB is in the range [EP enqueue pointer, first TRB)
+ * for the given endpoint and request.
+ */
+static bool trb_before_request(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req,
+ struct tegra_xudc_trb *trb)
+{
+ struct tegra_xudc_trb *enq_trb = &ep->transfer_ring[ep->enq_ptr];
+
+ dev_dbg(ep->xudc->dev, "%s: request %p -> %p; enq ptr: %p; trb %p\n",
+ __func__, req->first_trb, req->last_trb, enq_trb, trb);
+
+ if (trb < req->first_trb && (enq_trb <= trb ||
+ req->first_trb < enq_trb))
+ return true;
+
+ if (trb > req->first_trb && req->first_trb < enq_trb && enq_trb <= trb)
+ return true;
+
+ return false;
+}
+
+static int
+__tegra_xudc_ep_dequeue(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_request *req)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+ struct tegra_xudc_request *r;
+ struct tegra_xudc_trb *deq_trb;
+ bool busy, kick_queue = false;
+ int ret = 0;
+
+ /* Make sure the request is actually queued to this endpoint. */
+ list_for_each_entry(r, &ep->queue, list) {
+ if (r == req)
+ break;
+ }
+
+ if (r != req)
+ return -EINVAL;
+
+ /* Request hasn't been queued in the transfer ring yet. */
+ if (!req->trbs_queued) {
+ tegra_xudc_req_done(ep, req, -ECONNRESET);
+ return 0;
+ }
+
+ /* Halt DMA for this endpiont. */
+ if (ep_ctx_read_state(ep->context) == EP_STATE_RUNNING) {
+ ep_pause(xudc, ep->index);
+ ep_wait_for_inactive(xudc, ep->index);
+ }
+
+ deq_trb = trb_phys_to_virt(ep, ep_ctx_read_deq_ptr(ep->context));
+ /* Is the hardware processing the TRB at the dequeue pointer? */
+ busy = (trb_read_cycle(deq_trb) == ep_ctx_read_dcs(ep->context));
+
+ if (trb_in_request(ep, req, deq_trb) && busy) {
+ /*
+ * Request has been partially completed or it hasn't
+ * started processing yet.
+ */
+ dma_addr_t deq_ptr;
+
+ squeeze_transfer_ring(ep, req);
+
+ req->usb_req.actual = ep_ctx_read_edtla(ep->context);
+ tegra_xudc_req_done(ep, req, -ECONNRESET);
+ kick_queue = true;
+
+ /* EDTLA is > 0: request has been partially completed */
+ if (req->usb_req.actual > 0) {
+ /*
+ * Abort the pending transfer and update the dequeue
+ * pointer
+ */
+ ep_ctx_write_edtla(ep->context, 0);
+ ep_ctx_write_partial_td(ep->context, 0);
+ ep_ctx_write_data_offset(ep->context, 0);
+
+ deq_ptr = trb_virt_to_phys(ep,
+ &ep->transfer_ring[ep->enq_ptr]);
+
+ if (dma_mapping_error(xudc->dev, deq_ptr)) {
+ ret = -EINVAL;
+ } else {
+ ep_ctx_write_deq_ptr(ep->context, deq_ptr);
+ ep_ctx_write_dcs(ep->context, ep->pcs);
+ ep_reload(xudc, ep->index);
+ }
+ }
+ } else if (trb_before_request(ep, req, deq_trb) && busy) {
+ /* Request hasn't started processing yet. */
+ squeeze_transfer_ring(ep, req);
+
+ tegra_xudc_req_done(ep, req, -ECONNRESET);
+ kick_queue = true;
+ } else {
+ /*
+ * Request has completed, but we haven't processed the
+ * completion event yet.
+ */
+ tegra_xudc_req_done(ep, req, -ECONNRESET);
+ ret = -EINVAL;
+ }
+
+ /* Resume the endpoint. */
+ ep_unpause(xudc, ep->index);
+
+ if (kick_queue)
+ tegra_xudc_ep_kick_queue(ep);
+
+ return ret;
+}
+
+static int
+tegra_xudc_ep_dequeue(struct usb_ep *usb_ep, struct usb_request *usb_req)
+{
+ struct tegra_xudc_request *req;
+ struct tegra_xudc_ep *ep;
+ struct tegra_xudc *xudc;
+ unsigned long flags;
+ int ret;
+
+ if (!usb_ep || !usb_req)
+ return -EINVAL;
+
+ ep = to_xudc_ep(usb_ep);
+ req = to_xudc_req(usb_req);
+ xudc = ep->xudc;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (xudc->powergated || !ep->desc) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ ret = __tegra_xudc_ep_dequeue(ep, req);
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static int __tegra_xudc_ep_set_halt(struct tegra_xudc_ep *ep, bool halt)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+
+ if (!ep->desc)
+ return -EINVAL;
+
+ if (usb_endpoint_xfer_isoc(ep->desc)) {
+ dev_err(xudc->dev, "can't halt isoc EP\n");
+ return -ENOTSUPP;
+ }
+
+ if (!!(xudc_readl(xudc, EP_HALT) & BIT(ep->index)) == halt) {
+ dev_dbg(xudc->dev, "EP %u already %s\n", ep->index,
+ halt ? "halted" : "not halted");
+ return 0;
+ }
+
+ if (halt) {
+ ep_halt(xudc, ep->index);
+ } else {
+ ep_ctx_write_state(ep->context, EP_STATE_DISABLED);
+
+ ep_reload(xudc, ep->index);
+
+ ep_ctx_write_state(ep->context, EP_STATE_RUNNING);
+ ep_ctx_write_seq_num(ep->context, 0);
+
+ ep_reload(xudc, ep->index);
+ ep_unpause(xudc, ep->index);
+ ep_unhalt(xudc, ep->index);
+
+ tegra_xudc_ep_ring_doorbell(ep);
+ }
+
+ return 0;
+}
+
+static int tegra_xudc_ep_set_halt(struct usb_ep *usb_ep, int value)
+{
+ struct tegra_xudc_ep *ep;
+ struct tegra_xudc *xudc;
+ unsigned long flags;
+ int ret;
+
+ if (!usb_ep)
+ return -EINVAL;
+
+ ep = to_xudc_ep(usb_ep);
+ xudc = ep->xudc;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ if (xudc->powergated) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ if (value && usb_endpoint_dir_in(ep->desc) &&
+ !list_empty(&ep->queue)) {
+ dev_err(xudc->dev, "can't halt EP with requests pending\n");
+ ret = -EAGAIN;
+ goto unlock;
+ }
+
+ ret = __tegra_xudc_ep_set_halt(ep, value);
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static void tegra_xudc_ep_context_setup(struct tegra_xudc_ep *ep)
+{
+ const struct usb_endpoint_descriptor *desc = ep->desc;
+ const struct usb_ss_ep_comp_descriptor *comp_desc = ep->comp_desc;
+ struct tegra_xudc *xudc = ep->xudc;
+ u16 maxpacket, maxburst = 0, esit = 0;
+ u32 val;
+
+ maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
+ if (xudc->gadget.speed == USB_SPEED_SUPER) {
+ if (!usb_endpoint_xfer_control(desc))
+ maxburst = comp_desc->bMaxBurst;
+
+ if (usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc))
+ esit = le16_to_cpu(comp_desc->wBytesPerInterval);
+ } else if ((xudc->gadget.speed < USB_SPEED_SUPER) &&
+ (usb_endpoint_xfer_int(desc) ||
+ usb_endpoint_xfer_isoc(desc))) {
+ if (xudc->gadget.speed == USB_SPEED_HIGH) {
+ maxburst = (usb_endpoint_maxp(desc) >> 11) & 0x3;
+ if (maxburst == 0x3) {
+ dev_warn(xudc->dev,
+ "invalid endpoint maxburst\n");
+ maxburst = 0x2;
+ }
+ }
+ esit = maxpacket * (maxburst + 1);
+ }
+
+ memset(ep->context, 0, sizeof(*ep->context));
+
+ ep_ctx_write_state(ep->context, EP_STATE_RUNNING);
+ ep_ctx_write_interval(ep->context, desc->bInterval);
+ if (xudc->gadget.speed == USB_SPEED_SUPER) {
+ if (usb_endpoint_xfer_isoc(desc)) {
+ ep_ctx_write_mult(ep->context,
+ comp_desc->bmAttributes & 0x3);
+ }
+
+ if (usb_endpoint_xfer_bulk(desc)) {
+ ep_ctx_write_max_pstreams(ep->context,
+ comp_desc->bmAttributes &
+ 0x1f);
+ ep_ctx_write_lsa(ep->context, 1);
+ }
+ }
+
+ if (!usb_endpoint_xfer_control(desc) && usb_endpoint_dir_out(desc))
+ val = usb_endpoint_type(desc);
+ else
+ val = usb_endpoint_type(desc) + EP_TYPE_CONTROL;
+
+ ep_ctx_write_type(ep->context, val);
+ ep_ctx_write_cerr(ep->context, 0x3);
+ ep_ctx_write_max_packet_size(ep->context, maxpacket);
+ ep_ctx_write_max_burst_size(ep->context, maxburst);
+
+ ep_ctx_write_deq_ptr(ep->context, ep->transfer_ring_phys);
+ ep_ctx_write_dcs(ep->context, ep->pcs);
+
+ /* Select a reasonable average TRB length based on endpoint type. */
+ switch (usb_endpoint_type(desc)) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ val = 8;
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ val = 1024;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ case USB_ENDPOINT_XFER_ISOC:
+ default:
+ val = 3072;
+ break;
+ }
+
+ ep_ctx_write_avg_trb_len(ep->context, val);
+ ep_ctx_write_max_esit_payload(ep->context, esit);
+
+ ep_ctx_write_cerrcnt(ep->context, 0x3);
+}
+
+static void setup_link_trb(struct tegra_xudc_ep *ep,
+ struct tegra_xudc_trb *trb)
+{
+ trb_write_data_ptr(trb, ep->transfer_ring_phys);
+ trb_write_type(trb, TRB_TYPE_LINK);
+ trb_write_toggle_cycle(trb, 1);
+}
+
+static int __tegra_xudc_ep_disable(struct tegra_xudc_ep *ep)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+
+ if (ep_ctx_read_state(ep->context) == EP_STATE_DISABLED) {
+ dev_err(xudc->dev, "endpoint %u already disabled\n",
+ ep->index);
+ return -EINVAL;
+ }
+
+ ep_ctx_write_state(ep->context, EP_STATE_DISABLED);
+
+ ep_reload(xudc, ep->index);
+
+ tegra_xudc_ep_nuke(ep, -ESHUTDOWN);
+
+ xudc->nr_enabled_eps--;
+ if (usb_endpoint_xfer_isoc(ep->desc))
+ xudc->nr_isoch_eps--;
+
+ ep->desc = NULL;
+ ep->comp_desc = NULL;
+
+ memset(ep->context, 0, sizeof(*ep->context));
+
+ ep_unpause(xudc, ep->index);
+ ep_unhalt(xudc, ep->index);
+ if (xudc_readl(xudc, EP_STOPPED) & BIT(ep->index))
+ xudc_writel(xudc, BIT(ep->index), EP_STOPPED);
+
+ /*
+ * If this is the last endpoint disabled in a de-configure request,
+ * switch back to address state.
+ */
+ if ((xudc->device_state == USB_STATE_CONFIGURED) &&
+ (xudc->nr_enabled_eps == 1)) {
+ u32 val;
+
+ xudc->device_state = USB_STATE_ADDRESS;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ val = xudc_readl(xudc, CTRL);
+ val &= ~CTRL_RUN;
+ xudc_writel(xudc, val, CTRL);
+ }
+
+ dev_info(xudc->dev, "ep %u disabled\n", ep->index);
+
+ return 0;
+}
+
+static int tegra_xudc_ep_disable(struct usb_ep *usb_ep)
+{
+ struct tegra_xudc_ep *ep;
+ struct tegra_xudc *xudc;
+ unsigned long flags;
+ int ret;
+
+ if (!usb_ep)
+ return -EINVAL;
+
+ ep = to_xudc_ep(usb_ep);
+ xudc = ep->xudc;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ if (xudc->powergated) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ ret = __tegra_xudc_ep_disable(ep);
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static int __tegra_xudc_ep_enable(struct tegra_xudc_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct tegra_xudc *xudc = ep->xudc;
+ unsigned int i;
+ u32 val;
+
+ if (xudc->gadget.speed == USB_SPEED_SUPER &&
+ !usb_endpoint_xfer_control(desc) && !ep->usb_ep.comp_desc)
+ return -EINVAL;
+
+ /* Disable the EP if it is not disabled */
+ if (ep_ctx_read_state(ep->context) != EP_STATE_DISABLED)
+ __tegra_xudc_ep_disable(ep);
+
+ ep->desc = desc;
+ ep->comp_desc = ep->usb_ep.comp_desc;
+
+ if (usb_endpoint_xfer_isoc(desc)) {
+ if (xudc->nr_isoch_eps > XUDC_MAX_ISOCH_EPS) {
+ dev_err(xudc->dev, "too many isoch endpoints\n");
+ return -EBUSY;
+ }
+ xudc->nr_isoch_eps++;
+ }
+
+ memset(ep->transfer_ring, 0, XUDC_TRANSFER_RING_SIZE *
+ sizeof(*ep->transfer_ring));
+ setup_link_trb(ep, &ep->transfer_ring[XUDC_TRANSFER_RING_SIZE - 1]);
+
+ ep->enq_ptr = 0;
+ ep->deq_ptr = 0;
+ ep->pcs = true;
+ ep->ring_full = false;
+ xudc->nr_enabled_eps++;
+
+ tegra_xudc_ep_context_setup(ep);
+
+ /*
+ * No need to reload and un-halt EP0. This will be done automatically
+ * once a valid SETUP packet is received.
+ */
+ if (usb_endpoint_xfer_control(desc))
+ goto out;
+
+ /*
+ * Transition to configured state once the first non-control
+ * endpoint is enabled.
+ */
+ if (xudc->device_state == USB_STATE_ADDRESS) {
+ val = xudc_readl(xudc, CTRL);
+ val |= CTRL_RUN;
+ xudc_writel(xudc, val, CTRL);
+
+ xudc->device_state = USB_STATE_CONFIGURED;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+ }
+
+ if (usb_endpoint_xfer_isoc(desc)) {
+ /*
+ * Pause all bulk endpoints when enabling an isoch endpoint
+ * to ensure the isoch endpoint is allocated enough bandwidth.
+ */
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
+ if (xudc->ep[i].desc &&
+ usb_endpoint_xfer_bulk(xudc->ep[i].desc))
+ ep_pause(xudc, i);
+ }
+ }
+
+ ep_reload(xudc, ep->index);
+ ep_unpause(xudc, ep->index);
+ ep_unhalt(xudc, ep->index);
+
+ if (usb_endpoint_xfer_isoc(desc)) {
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
+ if (xudc->ep[i].desc &&
+ usb_endpoint_xfer_bulk(xudc->ep[i].desc))
+ ep_unpause(xudc, i);
+ }
+ }
+
+out:
+ dev_info(xudc->dev, "EP %u (type: %s, dir: %s) enabled\n", ep->index,
+ usb_ep_type_string(usb_endpoint_type(ep->desc)),
+ usb_endpoint_dir_in(ep->desc) ? "in" : "out");
+
+ return 0;
+}
+
+static int tegra_xudc_ep_enable(struct usb_ep *usb_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct tegra_xudc_ep *ep;
+ struct tegra_xudc *xudc;
+ unsigned long flags;
+ int ret;
+
+ if (!usb_ep || !desc || (desc->bDescriptorType != USB_DT_ENDPOINT))
+ return -EINVAL;
+
+ ep = to_xudc_ep(usb_ep);
+ xudc = ep->xudc;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ if (xudc->powergated) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ ret = __tegra_xudc_ep_enable(ep, desc);
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static struct usb_request *
+tegra_xudc_ep_alloc_request(struct usb_ep *usb_ep, gfp_t gfp)
+{
+ struct tegra_xudc_request *req;
+
+ req = kzalloc(sizeof(*req), gfp);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->list);
+
+ return &req->usb_req;
+}
+
+static void tegra_xudc_ep_free_request(struct usb_ep *usb_ep,
+ struct usb_request *usb_req)
+{
+ struct tegra_xudc_request *req = to_xudc_req(usb_req);
+
+ kfree(req);
+}
+
+static struct usb_ep_ops tegra_xudc_ep_ops = {
+ .enable = tegra_xudc_ep_enable,
+ .disable = tegra_xudc_ep_disable,
+ .alloc_request = tegra_xudc_ep_alloc_request,
+ .free_request = tegra_xudc_ep_free_request,
+ .queue = tegra_xudc_ep_queue,
+ .dequeue = tegra_xudc_ep_dequeue,
+ .set_halt = tegra_xudc_ep_set_halt,
+};
+
+static int tegra_xudc_ep0_enable(struct usb_ep *usb_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ return -EBUSY;
+}
+
+static int tegra_xudc_ep0_disable(struct usb_ep *usb_ep)
+{
+ return -EBUSY;
+}
+
+static struct usb_ep_ops tegra_xudc_ep0_ops = {
+ .enable = tegra_xudc_ep0_enable,
+ .disable = tegra_xudc_ep0_disable,
+ .alloc_request = tegra_xudc_ep_alloc_request,
+ .free_request = tegra_xudc_ep_free_request,
+ .queue = tegra_xudc_ep_queue,
+ .dequeue = tegra_xudc_ep_dequeue,
+ .set_halt = tegra_xudc_ep_set_halt,
+};
+
+static int tegra_xudc_gadget_get_frame(struct usb_gadget *gadget)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ if (xudc->powergated) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+
+ ret = (xudc_readl(xudc, MFINDEX) & MFINDEX_FRAME_MASK) >>
+ MFINDEX_FRAME_SHIFT;
+unlock:
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static void tegra_xudc_resume_device_state(struct tegra_xudc *xudc)
+{
+ unsigned int i;
+ u32 val;
+
+ ep_unpause_all(xudc);
+
+ /* Direct link to U0. */
+ val = xudc_readl(xudc, PORTSC);
+ if (((val & PORTSC_PLS_MASK) >> PORTSC_PLS_SHIFT) != PORTSC_PLS_U0) {
+ val &= ~(PORTSC_CHANGE_MASK | PORTSC_PLS_MASK);
+ val |= PORTSC_LWS | PORTSC_PLS(PORTSC_PLS_U0);
+ xudc_writel(xudc, val, PORTSC);
+ }
+
+ if (xudc->device_state == USB_STATE_SUSPENDED) {
+ xudc->device_state = xudc->resume_state;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+ xudc->resume_state = 0;
+ }
+
+ /*
+ * Doorbells may be dropped if they are sent too soon (< ~200ns)
+ * after unpausing the endpoint. Wait for 500ns just to be safe.
+ */
+ ndelay(500);
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
+ tegra_xudc_ep_ring_doorbell(&xudc->ep[i]);
+}
+
+static int tegra_xudc_gadget_wakeup(struct usb_gadget *gadget)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+ unsigned long flags;
+ int ret = 0;
+ u32 val;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (xudc->powergated) {
+ ret = -ESHUTDOWN;
+ goto unlock;
+ }
+ val = xudc_readl(xudc, PORTPM);
+ dev_dbg(xudc->dev, "%s: PORTPM=%#x, speed=%x\n", __func__,
+ val, gadget->speed);
+
+ if (((xudc->gadget.speed <= USB_SPEED_HIGH) &&
+ (val & PORTPM_RWE)) ||
+ ((xudc->gadget.speed == USB_SPEED_SUPER) &&
+ (val & PORTPM_FRWE))) {
+ tegra_xudc_resume_device_state(xudc);
+
+ /* Send Device Notification packet. */
+ if (xudc->gadget.speed == USB_SPEED_SUPER) {
+ val = DEVNOTIF_LO_TYPE(DEVNOTIF_LO_TYPE_FUNCTION_WAKE)
+ | DEVNOTIF_LO_TRIG;
+ xudc_writel(xudc, 0, DEVNOTIF_HI);
+ xudc_writel(xudc, val, DEVNOTIF_LO);
+ }
+ }
+
+unlock:
+ dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return ret;
+}
+
+static int tegra_xudc_gadget_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+ unsigned long flags;
+ u32 val;
+
+ pm_runtime_get_sync(xudc->dev);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (is_on != xudc->pullup) {
+ val = xudc_readl(xudc, CTRL);
+ if (is_on)
+ val |= CTRL_ENABLE;
+ else
+ val &= ~CTRL_ENABLE;
+ xudc_writel(xudc, val, CTRL);
+ }
+
+ xudc->pullup = is_on;
+ dev_dbg(xudc->dev, "%s: pullup:%d", __func__, is_on);
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ pm_runtime_put(xudc->dev);
+
+ return 0;
+}
+
+static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+ unsigned long flags;
+ u32 val;
+ int ret;
+
+ if (!driver)
+ return -EINVAL;
+
+ pm_runtime_get_sync(xudc->dev);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ if (xudc->driver) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ xudc->setup_state = WAIT_FOR_SETUP;
+ xudc->device_state = USB_STATE_DEFAULT;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ ret = __tegra_xudc_ep_enable(&xudc->ep[0], &tegra_xudc_ep0_desc);
+ if (ret < 0)
+ goto unlock;
+
+ val = xudc_readl(xudc, CTRL);
+ val |= CTRL_IE | CTRL_LSE;
+ xudc_writel(xudc, val, CTRL);
+
+ val = xudc_readl(xudc, PORTHALT);
+ val |= PORTHALT_STCHG_INTR_EN;
+ xudc_writel(xudc, val, PORTHALT);
+
+ if (xudc->pullup) {
+ val = xudc_readl(xudc, CTRL);
+ val |= CTRL_ENABLE;
+ xudc_writel(xudc, val, CTRL);
+ }
+
+ xudc->driver = driver;
+unlock:
+ dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ pm_runtime_put(xudc->dev);
+
+ return ret;
+}
+
+static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+ unsigned long flags;
+ u32 val;
+
+ pm_runtime_get_sync(xudc->dev);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ val = xudc_readl(xudc, CTRL);
+ val &= ~(CTRL_IE | CTRL_ENABLE);
+ xudc_writel(xudc, val, CTRL);
+
+ __tegra_xudc_ep_disable(&xudc->ep[0]);
+
+ xudc->driver = NULL;
+ dev_dbg(xudc->dev, "Gadget stopped");
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ pm_runtime_put(xudc->dev);
+
+ return 0;
+}
+
+static int tegra_xudc_set_selfpowered(struct usb_gadget *gadget, int is_on)
+{
+ struct tegra_xudc *xudc = to_xudc(gadget);
+
+ dev_dbg(xudc->dev, "%s: %d\n", __func__, is_on);
+ xudc->selfpowered = !!is_on;
+
+ return 0;
+}
+
+static struct usb_gadget_ops tegra_xudc_gadget_ops = {
+ .get_frame = tegra_xudc_gadget_get_frame,
+ .wakeup = tegra_xudc_gadget_wakeup,
+ .pullup = tegra_xudc_gadget_pullup,
+ .udc_start = tegra_xudc_gadget_start,
+ .udc_stop = tegra_xudc_gadget_stop,
+ .set_selfpowered = tegra_xudc_set_selfpowered,
+};
+
+static void no_op_complete(struct usb_ep *ep, struct usb_request *req)
+{
+}
+
+static int
+tegra_xudc_ep0_queue_status(struct tegra_xudc *xudc,
+ void (*cmpl)(struct usb_ep *, struct usb_request *))
+{
+ xudc->ep0_req->usb_req.buf = NULL;
+ xudc->ep0_req->usb_req.dma = 0;
+ xudc->ep0_req->usb_req.length = 0;
+ xudc->ep0_req->usb_req.complete = cmpl;
+ xudc->ep0_req->usb_req.context = xudc;
+
+ return __tegra_xudc_ep_queue(&xudc->ep[0], xudc->ep0_req);
+}
+
+static int
+tegra_xudc_ep0_queue_data(struct tegra_xudc *xudc, void *buf, size_t len,
+ void (*cmpl)(struct usb_ep *, struct usb_request *))
+{
+ xudc->ep0_req->usb_req.buf = buf;
+ xudc->ep0_req->usb_req.length = len;
+ xudc->ep0_req->usb_req.complete = cmpl;
+ xudc->ep0_req->usb_req.context = xudc;
+
+ return __tegra_xudc_ep_queue(&xudc->ep[0], xudc->ep0_req);
+}
+
+static void tegra_xudc_ep0_req_done(struct tegra_xudc *xudc)
+{
+ switch (xudc->setup_state) {
+ case DATA_STAGE_XFER:
+ xudc->setup_state = STATUS_STAGE_RECV;
+ tegra_xudc_ep0_queue_status(xudc, no_op_complete);
+ break;
+ case DATA_STAGE_RECV:
+ xudc->setup_state = STATUS_STAGE_XFER;
+ tegra_xudc_ep0_queue_status(xudc, no_op_complete);
+ break;
+ default:
+ xudc->setup_state = WAIT_FOR_SETUP;
+ break;
+ }
+}
+
+static int tegra_xudc_ep0_delegate_req(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ int ret;
+
+ spin_unlock(&xudc->lock);
+ ret = xudc->driver->setup(&xudc->gadget, ctrl);
+ spin_lock(&xudc->lock);
+
+ return ret;
+}
+
+static void set_feature_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct tegra_xudc *xudc = req->context;
+
+ if (xudc->test_mode_pattern) {
+ xudc_writel(xudc, xudc->test_mode_pattern, PORT_TM);
+ xudc->test_mode_pattern = 0;
+ }
+}
+
+static int tegra_xudc_ep0_set_feature(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
+ u32 feature = le16_to_cpu(ctrl->wValue);
+ u32 index = le16_to_cpu(ctrl->wIndex);
+ u32 val, ep;
+ int ret;
+
+ if (le16_to_cpu(ctrl->wLength) != 0)
+ return -EINVAL;
+
+ switch (ctrl->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ switch (feature) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ if ((xudc->gadget.speed == USB_SPEED_SUPER) ||
+ (xudc->device_state == USB_STATE_DEFAULT))
+ return -EINVAL;
+
+ val = xudc_readl(xudc, PORTPM);
+ if (set)
+ val |= PORTPM_RWE;
+ else
+ val &= ~PORTPM_RWE;
+
+ xudc_writel(xudc, val, PORTPM);
+ break;
+ case USB_DEVICE_U1_ENABLE:
+ case USB_DEVICE_U2_ENABLE:
+ if ((xudc->device_state != USB_STATE_CONFIGURED) ||
+ (xudc->gadget.speed != USB_SPEED_SUPER))
+ return -EINVAL;
+
+ val = xudc_readl(xudc, PORTPM);
+ if ((feature == USB_DEVICE_U1_ENABLE) &&
+ xudc->soc->u1_enable) {
+ if (set)
+ val |= PORTPM_U1E;
+ else
+ val &= ~PORTPM_U1E;
+ }
+
+ if ((feature == USB_DEVICE_U2_ENABLE) &&
+ xudc->soc->u2_enable) {
+ if (set)
+ val |= PORTPM_U2E;
+ else
+ val &= ~PORTPM_U2E;
+ }
+
+ xudc_writel(xudc, val, PORTPM);
+ break;
+ case USB_DEVICE_TEST_MODE:
+ if (xudc->gadget.speed != USB_SPEED_HIGH)
+ return -EINVAL;
+
+ if (!set)
+ return -EINVAL;
+
+ xudc->test_mode_pattern = index >> 8;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ break;
+ case USB_RECIP_INTERFACE:
+ if (xudc->device_state != USB_STATE_CONFIGURED)
+ return -EINVAL;
+
+ switch (feature) {
+ case USB_INTRF_FUNC_SUSPEND:
+ if (set) {
+ val = xudc_readl(xudc, PORTPM);
+
+ if (index & USB_INTRF_FUNC_SUSPEND_RW)
+ val |= PORTPM_FRWE;
+ else
+ val &= ~PORTPM_FRWE;
+
+ xudc_writel(xudc, val, PORTPM);
+ }
+
+ return tegra_xudc_ep0_delegate_req(xudc, ctrl);
+ default:
+ return -EINVAL;
+ }
+
+ break;
+ case USB_RECIP_ENDPOINT:
+ ep = (index & USB_ENDPOINT_NUMBER_MASK) * 2 +
+ ((index & USB_DIR_IN) ? 1 : 0);
+
+ if ((xudc->device_state == USB_STATE_DEFAULT) ||
+ ((xudc->device_state == USB_STATE_ADDRESS) &&
+ (index != 0)))
+ return -EINVAL;
+
+ ret = __tegra_xudc_ep_set_halt(&xudc->ep[ep], set);
+ if (ret < 0)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return tegra_xudc_ep0_queue_status(xudc, set_feature_complete);
+}
+
+static int tegra_xudc_ep0_get_status(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ struct tegra_xudc_ep_context *ep_ctx;
+ u32 val, ep, index = le16_to_cpu(ctrl->wIndex);
+ u16 status = 0;
+
+ if (!(ctrl->bRequestType & USB_DIR_IN))
+ return -EINVAL;
+
+ if ((le16_to_cpu(ctrl->wValue) != 0) ||
+ (le16_to_cpu(ctrl->wLength) != 2))
+ return -EINVAL;
+
+ switch (ctrl->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_DEVICE:
+ val = xudc_readl(xudc, PORTPM);
+
+ if (xudc->selfpowered)
+ status |= BIT(USB_DEVICE_SELF_POWERED);
+
+ if ((xudc->gadget.speed < USB_SPEED_SUPER) &&
+ (val & PORTPM_RWE))
+ status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
+
+ if (xudc->gadget.speed == USB_SPEED_SUPER) {
+ if (val & PORTPM_U1E)
+ status |= BIT(USB_DEV_STAT_U1_ENABLED);
+ if (val & PORTPM_U2E)
+ status |= BIT(USB_DEV_STAT_U2_ENABLED);
+ }
+ break;
+ case USB_RECIP_INTERFACE:
+ if (xudc->gadget.speed == USB_SPEED_SUPER) {
+ status |= USB_INTRF_STAT_FUNC_RW_CAP;
+ val = xudc_readl(xudc, PORTPM);
+ if (val & PORTPM_FRWE)
+ status |= USB_INTRF_STAT_FUNC_RW;
+ }
+ break;
+ case USB_RECIP_ENDPOINT:
+ ep = (index & USB_ENDPOINT_NUMBER_MASK) * 2 +
+ ((index & USB_DIR_IN) ? 1 : 0);
+ ep_ctx = &xudc->ep_context[ep];
+
+ if ((xudc->device_state != USB_STATE_CONFIGURED) &&
+ ((xudc->device_state != USB_STATE_ADDRESS) || (ep != 0)))
+ return -EINVAL;
+
+ if (ep_ctx_read_state(ep_ctx) == EP_STATE_DISABLED)
+ return -EINVAL;
+
+ if (xudc_readl(xudc, EP_HALT) & BIT(ep))
+ status |= BIT(USB_ENDPOINT_HALT);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ xudc->status_buf = cpu_to_le16(status);
+ return tegra_xudc_ep0_queue_data(xudc, &xudc->status_buf,
+ sizeof(xudc->status_buf),
+ no_op_complete);
+}
+
+static void set_sel_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ /* Nothing to do with SEL values */
+}
+
+static int tegra_xudc_ep0_set_sel(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
+ USB_TYPE_STANDARD))
+ return -EINVAL;
+
+ if (xudc->device_state == USB_STATE_DEFAULT)
+ return -EINVAL;
+
+ if ((le16_to_cpu(ctrl->wIndex) != 0) ||
+ (le16_to_cpu(ctrl->wValue) != 0) ||
+ (le16_to_cpu(ctrl->wLength) != 6))
+ return -EINVAL;
+
+ return tegra_xudc_ep0_queue_data(xudc, &xudc->sel_timing,
+ sizeof(xudc->sel_timing),
+ set_sel_complete);
+}
+
+static void set_isoch_delay_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ /* Nothing to do with isoch delay */
+}
+
+static int tegra_xudc_ep0_set_isoch_delay(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ u32 delay = le16_to_cpu(ctrl->wValue);
+
+ if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
+ USB_TYPE_STANDARD))
+ return -EINVAL;
+
+ if ((delay > 65535) || (le16_to_cpu(ctrl->wIndex) != 0) ||
+ (le16_to_cpu(ctrl->wLength) != 0))
+ return -EINVAL;
+
+ xudc->isoch_delay = delay;
+
+ return tegra_xudc_ep0_queue_status(xudc, set_isoch_delay_complete);
+}
+
+static void set_address_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct tegra_xudc *xudc = req->context;
+
+ if ((xudc->device_state == USB_STATE_DEFAULT) &&
+ (xudc->dev_addr != 0)) {
+ xudc->device_state = USB_STATE_ADDRESS;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+ } else if ((xudc->device_state == USB_STATE_ADDRESS) &&
+ (xudc->dev_addr == 0)) {
+ xudc->device_state = USB_STATE_DEFAULT;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+ }
+}
+
+static int tegra_xudc_ep0_set_address(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ struct tegra_xudc_ep *ep0 = &xudc->ep[0];
+ u32 val, addr = le16_to_cpu(ctrl->wValue);
+
+ if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
+ USB_TYPE_STANDARD))
+ return -EINVAL;
+
+ if ((addr > 127) || (le16_to_cpu(ctrl->wIndex) != 0) ||
+ (le16_to_cpu(ctrl->wLength) != 0))
+ return -EINVAL;
+
+ if (xudc->device_state == USB_STATE_CONFIGURED)
+ return -EINVAL;
+
+ dev_dbg(xudc->dev, "set address: %u\n", addr);
+
+ xudc->dev_addr = addr;
+ val = xudc_readl(xudc, CTRL);
+ val &= ~(CTRL_DEVADDR_MASK);
+ val |= CTRL_DEVADDR(addr);
+ xudc_writel(xudc, val, CTRL);
+
+ ep_ctx_write_devaddr(ep0->context, addr);
+
+ return tegra_xudc_ep0_queue_status(xudc, set_address_complete);
+}
+
+static int tegra_xudc_ep0_standard_req(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl)
+{
+ int ret;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_GET_STATUS:
+ dev_dbg(xudc->dev, "USB_REQ_GET_STATUS\n");
+ ret = tegra_xudc_ep0_get_status(xudc, ctrl);
+ break;
+ case USB_REQ_SET_ADDRESS:
+ dev_dbg(xudc->dev, "USB_REQ_SET_ADDRESS\n");
+ ret = tegra_xudc_ep0_set_address(xudc, ctrl);
+ break;
+ case USB_REQ_SET_SEL:
+ dev_dbg(xudc->dev, "USB_REQ_SET_SEL\n");
+ ret = tegra_xudc_ep0_set_sel(xudc, ctrl);
+ break;
+ case USB_REQ_SET_ISOCH_DELAY:
+ dev_dbg(xudc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
+ ret = tegra_xudc_ep0_set_isoch_delay(xudc, ctrl);
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ case USB_REQ_SET_FEATURE:
+ dev_dbg(xudc->dev, "USB_REQ_CLEAR/SET_FEATURE\n");
+ ret = tegra_xudc_ep0_set_feature(xudc, ctrl);
+ break;
+ case USB_REQ_SET_CONFIGURATION:
+ dev_dbg(xudc->dev, "USB_REQ_SET_CONFIGURATION\n");
+ /*
+ * In theory we need to clear RUN bit before status stage of
+ * deconfig request sent, but this seems to be causing problems.
+ * Clear RUN once all endpoints are disabled instead.
+ */
+ __attribute__ ((fallthrough));
+ default:
+ ret = tegra_xudc_ep0_delegate_req(xudc, ctrl);
+ break;
+ }
+
+ return ret;
+}
+
+static void tegra_xudc_handle_ep0_setup_packet(struct tegra_xudc *xudc,
+ struct usb_ctrlrequest *ctrl,
+ u16 seq_num)
+{
+ int ret;
+
+ xudc->setup_seq_num = seq_num;
+
+ /* Ensure EP0 is unhalted. */
+ ep_unhalt(xudc, 0);
+
+ /*
+ * On Tegra210, setup packets with sequence numbers 0xfffe or 0xffff
+ * are invalid. Halt EP0 until we get a valid packet.
+ */
+ if (xudc->soc->invalid_seq_num &&
+ (seq_num == 0xfffe || seq_num == 0xffff)) {
+ dev_warn(xudc->dev, "invalid sequence number detected\n");
+ ep_halt(xudc, 0);
+ return;
+ }
+
+ if (ctrl->wLength)
+ xudc->setup_state = (ctrl->bRequestType & USB_DIR_IN) ?
+ DATA_STAGE_XFER : DATA_STAGE_RECV;
+ else
+ xudc->setup_state = STATUS_STAGE_XFER;
+
+ if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+ ret = tegra_xudc_ep0_standard_req(xudc, ctrl);
+ else
+ ret = tegra_xudc_ep0_delegate_req(xudc, ctrl);
+
+ if (ret < 0) {
+ dev_warn(xudc->dev, "setup request failed: %d\n", ret);
+ xudc->setup_state = WAIT_FOR_SETUP;
+ ep_halt(xudc, 0);
+ }
+}
+
+static void tegra_xudc_handle_ep0_event(struct tegra_xudc *xudc,
+ struct tegra_xudc_trb *event)
+{
+ struct usb_ctrlrequest *ctrl = (struct usb_ctrlrequest *)event;
+ u16 seq_num = trb_read_seq_num(event);
+
+ if (xudc->setup_state != WAIT_FOR_SETUP) {
+ /*
+ * The controller is in the process of handling another
+ * setup request. Queue subsequent requests and handle
+ * the last one once the controller reports a sequence
+ * number error.
+ */
+ memcpy(&xudc->setup_packet.ctrl_req, ctrl, sizeof(*ctrl));
+ xudc->setup_packet.seq_num = seq_num;
+ xudc->queued_setup_packet = true;
+ } else {
+ tegra_xudc_handle_ep0_setup_packet(xudc, ctrl, seq_num);
+ }
+}
+
+static struct tegra_xudc_request *
+trb_to_request(struct tegra_xudc_ep *ep, struct tegra_xudc_trb *trb)
+{
+ struct tegra_xudc_request *req;
+
+ list_for_each_entry(req, &ep->queue, list) {
+ if (!req->trbs_queued)
+ break;
+
+ if (trb_in_request(ep, req, trb))
+ return req;
+ }
+
+ return NULL;
+}
+
+static void tegra_xudc_handle_transfer_completion(struct tegra_xudc *xudc,
+ struct tegra_xudc_ep *ep,
+ struct tegra_xudc_trb *event)
+{
+ struct tegra_xudc_request *req;
+ struct tegra_xudc_trb *trb;
+ bool short_packet;
+
+ short_packet = (trb_read_cmpl_code(event) ==
+ TRB_CMPL_CODE_SHORT_PACKET);
+
+ trb = trb_phys_to_virt(ep, trb_read_data_ptr(event));
+ req = trb_to_request(ep, trb);
+
+ /*
+ * TDs are complete on short packet or when the completed TRB is the
+ * last TRB in the TD (the CHAIN bit is unset).
+ */
+ if (req && (short_packet || (!trb_read_chain(trb) &&
+ (req->trbs_needed == req->trbs_queued)))) {
+ struct tegra_xudc_trb *last = req->last_trb;
+ unsigned int residual;
+
+ residual = trb_read_transfer_len(event);
+ req->usb_req.actual = req->usb_req.length - residual;
+
+ dev_dbg(xudc->dev, "bytes transferred %u / %u\n",
+ req->usb_req.actual, req->usb_req.length);
+
+ tegra_xudc_req_done(ep, req, 0);
+
+ if (ep->desc && usb_endpoint_xfer_control(ep->desc))
+ tegra_xudc_ep0_req_done(xudc);
+
+ /*
+ * Advance the dequeue pointer past the end of the current TD
+ * on short packet completion.
+ */
+ if (short_packet) {
+ ep->deq_ptr = (last - ep->transfer_ring) + 1;
+ if (ep->deq_ptr == XUDC_TRANSFER_RING_SIZE - 1)
+ ep->deq_ptr = 0;
+ }
+ } else if (!req) {
+ dev_warn(xudc->dev, "transfer event on dequeued request\n");
+ }
+
+ if (ep->desc)
+ tegra_xudc_ep_kick_queue(ep);
+}
+
+static void tegra_xudc_handle_transfer_event(struct tegra_xudc *xudc,
+ struct tegra_xudc_trb *event)
+{
+ unsigned int ep_index = trb_read_endpoint_id(event);
+ struct tegra_xudc_ep *ep = &xudc->ep[ep_index];
+ struct tegra_xudc_trb *trb;
+ u16 comp_code;
+
+ if (ep_ctx_read_state(ep->context) == EP_STATE_DISABLED) {
+ dev_warn(xudc->dev, "transfer event on disabled EP %u\n",
+ ep_index);
+ return;
+ }
+
+ /* Update transfer ring dequeue pointer. */
+ trb = trb_phys_to_virt(ep, trb_read_data_ptr(event));
+ comp_code = trb_read_cmpl_code(event);
+ if (comp_code != TRB_CMPL_CODE_BABBLE_DETECTED_ERR) {
+ ep->deq_ptr = (trb - ep->transfer_ring) + 1;
+
+ if (ep->deq_ptr == XUDC_TRANSFER_RING_SIZE - 1)
+ ep->deq_ptr = 0;
+ ep->ring_full = false;
+ }
+
+ switch (comp_code) {
+ case TRB_CMPL_CODE_SUCCESS:
+ case TRB_CMPL_CODE_SHORT_PACKET:
+ tegra_xudc_handle_transfer_completion(xudc, ep, event);
+ break;
+ case TRB_CMPL_CODE_HOST_REJECTED:
+ dev_info(xudc->dev, "stream rejected on EP %u\n", ep_index);
+
+ ep->stream_rejected = true;
+ break;
+ case TRB_CMPL_CODE_PRIME_PIPE_RECEIVED:
+ dev_info(xudc->dev, "prime pipe received on EP %u\n", ep_index);
+
+ if (ep->stream_rejected) {
+ ep->stream_rejected = false;
+ /*
+ * An EP is stopped when a stream is rejected. Wait
+ * for the EP to report that it is stopped and then
+ * un-stop it.
+ */
+ ep_wait_for_stopped(xudc, ep_index);
+ }
+ tegra_xudc_ep_ring_doorbell(ep);
+ break;
+ case TRB_CMPL_CODE_BABBLE_DETECTED_ERR:
+ /*
+ * Wait for the EP to be stopped so the controller stops
+ * processing doorbells.
+ */
+ ep_wait_for_stopped(xudc, ep_index);
+ ep->enq_ptr = ep->deq_ptr;
+ tegra_xudc_ep_nuke(ep, -EIO);
+ /* FALLTHROUGH */
+ case TRB_CMPL_CODE_STREAM_NUMP_ERROR:
+ case TRB_CMPL_CODE_CTRL_DIR_ERR:
+ case TRB_CMPL_CODE_INVALID_STREAM_TYPE_ERR:
+ case TRB_CMPL_CODE_RING_UNDERRUN:
+ case TRB_CMPL_CODE_RING_OVERRUN:
+ case TRB_CMPL_CODE_ISOCH_BUFFER_OVERRUN:
+ case TRB_CMPL_CODE_USB_TRANS_ERR:
+ case TRB_CMPL_CODE_TRB_ERR:
+ dev_err(xudc->dev, "completion error %#x on EP %u\n",
+ comp_code, ep_index);
+
+ ep_halt(xudc, ep_index);
+ break;
+ case TRB_CMPL_CODE_CTRL_SEQNUM_ERR:
+ dev_info(xudc->dev, "sequence number error\n");
+
+ /*
+ * Kill any queued control request and skip to the last
+ * setup packet we received.
+ */
+ tegra_xudc_ep_nuke(ep, -EINVAL);
+ xudc->setup_state = WAIT_FOR_SETUP;
+ if (!xudc->queued_setup_packet)
+ break;
+
+ tegra_xudc_handle_ep0_setup_packet(xudc,
+ &xudc->setup_packet.ctrl_req,
+ xudc->setup_packet.seq_num);
+ xudc->queued_setup_packet = false;
+ break;
+ case TRB_CMPL_CODE_STOPPED:
+ dev_dbg(xudc->dev, "stop completion code on EP %u\n",
+ ep_index);
+
+ /* Disconnected. */
+ tegra_xudc_ep_nuke(ep, -ECONNREFUSED);
+ break;
+ default:
+ dev_dbg(xudc->dev, "completion event %#x on EP %u\n",
+ comp_code, ep_index);
+ break;
+ }
+}
+
+static void tegra_xudc_reset(struct tegra_xudc *xudc)
+{
+ struct tegra_xudc_ep *ep0 = &xudc->ep[0];
+ dma_addr_t deq_ptr;
+ unsigned int i;
+
+ xudc->setup_state = WAIT_FOR_SETUP;
+ xudc->device_state = USB_STATE_DEFAULT;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ ep_unpause_all(xudc);
+
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
+ tegra_xudc_ep_nuke(&xudc->ep[i], -ESHUTDOWN);
+
+ /*
+ * Reset sequence number and dequeue pointer to flush the transfer
+ * ring.
+ */
+ ep0->deq_ptr = ep0->enq_ptr;
+ ep0->ring_full = false;
+
+ xudc->setup_seq_num = 0;
+ xudc->queued_setup_packet = false;
+
+ ep_ctx_write_seq_num(ep0->context, xudc->setup_seq_num);
+
+ deq_ptr = trb_virt_to_phys(ep0, &ep0->transfer_ring[ep0->deq_ptr]);
+
+ if (!dma_mapping_error(xudc->dev, deq_ptr)) {
+ ep_ctx_write_deq_ptr(ep0->context, deq_ptr);
+ ep_ctx_write_dcs(ep0->context, ep0->pcs);
+ }
+
+ ep_unhalt_all(xudc);
+ ep_reload(xudc, 0);
+ ep_unpause(xudc, 0);
+}
+
+static void tegra_xudc_port_connect(struct tegra_xudc *xudc)
+{
+ struct tegra_xudc_ep *ep0 = &xudc->ep[0];
+ u16 maxpacket;
+ u32 val;
+
+ val = (xudc_readl(xudc, PORTSC) & PORTSC_PS_MASK) >> PORTSC_PS_SHIFT;
+ switch (val) {
+ case PORTSC_PS_LS:
+ xudc->gadget.speed = USB_SPEED_LOW;
+ break;
+ case PORTSC_PS_FS:
+ xudc->gadget.speed = USB_SPEED_FULL;
+ break;
+ case PORTSC_PS_HS:
+ xudc->gadget.speed = USB_SPEED_HIGH;
+ break;
+ case PORTSC_PS_SS:
+ xudc->gadget.speed = USB_SPEED_SUPER;
+ break;
+ default:
+ xudc->gadget.speed = USB_SPEED_UNKNOWN;
+ break;
+ }
+
+ xudc->device_state = USB_STATE_DEFAULT;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ xudc->setup_state = WAIT_FOR_SETUP;
+
+ if (xudc->gadget.speed == USB_SPEED_SUPER)
+ maxpacket = 512;
+ else
+ maxpacket = 64;
+
+ ep_ctx_write_max_packet_size(ep0->context, maxpacket);
+ tegra_xudc_ep0_desc.wMaxPacketSize = cpu_to_le16(maxpacket);
+ usb_ep_set_maxpacket_limit(&ep0->usb_ep, maxpacket);
+
+ if (!xudc->soc->u1_enable) {
+ val = xudc_readl(xudc, PORTPM);
+ val &= ~(PORTPM_U1TIMEOUT_MASK);
+ xudc_writel(xudc, val, PORTPM);
+ }
+
+ if (!xudc->soc->u2_enable) {
+ val = xudc_readl(xudc, PORTPM);
+ val &= ~(PORTPM_U2TIMEOUT_MASK);
+ xudc_writel(xudc, val, PORTPM);
+ }
+
+ if (xudc->gadget.speed <= USB_SPEED_HIGH) {
+ val = xudc_readl(xudc, PORTPM);
+ val &= ~(PORTPM_L1S_MASK);
+ if (xudc->soc->lpm_enable)
+ val |= PORTPM_L1S(PORTPM_L1S_ACCEPT);
+ else
+ val |= PORTPM_L1S(PORTPM_L1S_NYET);
+ xudc_writel(xudc, val, PORTPM);
+ }
+
+ val = xudc_readl(xudc, ST);
+ if (val & ST_RC)
+ xudc_writel(xudc, ST_RC, ST);
+}
+
+static void tegra_xudc_port_disconnect(struct tegra_xudc *xudc)
+{
+ tegra_xudc_reset(xudc);
+
+ if (xudc->driver && xudc->driver->disconnect) {
+ spin_unlock(&xudc->lock);
+ xudc->driver->disconnect(&xudc->gadget);
+ spin_lock(&xudc->lock);
+ }
+
+ xudc->device_state = USB_STATE_NOTATTACHED;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ complete(&xudc->disconnect_complete);
+}
+
+static void tegra_xudc_port_reset(struct tegra_xudc *xudc)
+{
+ tegra_xudc_reset(xudc);
+
+ if (xudc->driver) {
+ spin_unlock(&xudc->lock);
+ usb_gadget_udc_reset(&xudc->gadget, xudc->driver);
+ spin_lock(&xudc->lock);
+ }
+
+ tegra_xudc_port_connect(xudc);
+}
+
+static void tegra_xudc_port_suspend(struct tegra_xudc *xudc)
+{
+ dev_dbg(xudc->dev, "port suspend\n");
+
+ xudc->resume_state = xudc->device_state;
+ xudc->device_state = USB_STATE_SUSPENDED;
+ usb_gadget_set_state(&xudc->gadget, xudc->device_state);
+
+ if (xudc->driver->suspend) {
+ spin_unlock(&xudc->lock);
+ xudc->driver->suspend(&xudc->gadget);
+ spin_lock(&xudc->lock);
+ }
+}
+
+static void tegra_xudc_port_resume(struct tegra_xudc *xudc)
+{
+ dev_dbg(xudc->dev, "port resume\n");
+
+ tegra_xudc_resume_device_state(xudc);
+
+ if (xudc->driver->resume) {
+ spin_unlock(&xudc->lock);
+ xudc->driver->resume(&xudc->gadget);
+ spin_lock(&xudc->lock);
+ }
+}
+
+static inline void clear_port_change(struct tegra_xudc *xudc, u32 flag)
+{
+ u32 val;
+
+ val = xudc_readl(xudc, PORTSC);
+ val &= ~PORTSC_CHANGE_MASK;
+ val |= flag;
+ xudc_writel(xudc, val, PORTSC);
+}
+
+static void __tegra_xudc_handle_port_status(struct tegra_xudc *xudc)
+{
+ u32 portsc, porthalt;
+
+ porthalt = xudc_readl(xudc, PORTHALT);
+ if ((porthalt & PORTHALT_STCHG_REQ) &&
+ (porthalt & PORTHALT_HALT_LTSSM)) {
+ dev_dbg(xudc->dev, "STCHG_REQ, PORTHALT = %#x\n", porthalt);
+ porthalt &= ~PORTHALT_HALT_LTSSM;
+ xudc_writel(xudc, porthalt, PORTHALT);
+ }
+
+ portsc = xudc_readl(xudc, PORTSC);
+ if ((portsc & PORTSC_PRC) && (portsc & PORTSC_PR)) {
+ dev_dbg(xudc->dev, "PRC, PR, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_PRC | PORTSC_PED);
+#define TOGGLE_VBUS_WAIT_MS 100
+ if (xudc->soc->port_reset_quirk) {
+ schedule_delayed_work(&xudc->port_reset_war_work,
+ msecs_to_jiffies(TOGGLE_VBUS_WAIT_MS));
+ xudc->wait_for_sec_prc = 1;
+ }
+ }
+
+ if ((portsc & PORTSC_PRC) && !(portsc & PORTSC_PR)) {
+ dev_dbg(xudc->dev, "PRC, Not PR, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_PRC | PORTSC_PED);
+ tegra_xudc_port_reset(xudc);
+ cancel_delayed_work(&xudc->port_reset_war_work);
+ xudc->wait_for_sec_prc = 0;
+ }
+
+ portsc = xudc_readl(xudc, PORTSC);
+ if (portsc & PORTSC_WRC) {
+ dev_dbg(xudc->dev, "WRC, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_WRC | PORTSC_PED);
+ if (!(xudc_readl(xudc, PORTSC) & PORTSC_WPR))
+ tegra_xudc_port_reset(xudc);
+ }
+
+ portsc = xudc_readl(xudc, PORTSC);
+ if (portsc & PORTSC_CSC) {
+ dev_dbg(xudc->dev, "CSC, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_CSC);
+
+ if (portsc & PORTSC_CCS)
+ tegra_xudc_port_connect(xudc);
+ else
+ tegra_xudc_port_disconnect(xudc);
+
+ if (xudc->wait_csc) {
+ cancel_delayed_work(&xudc->plc_reset_work);
+ xudc->wait_csc = false;
+ }
+ }
+
+ portsc = xudc_readl(xudc, PORTSC);
+ if (portsc & PORTSC_PLC) {
+ u32 pls = (portsc & PORTSC_PLS_MASK) >> PORTSC_PLS_SHIFT;
+
+ dev_dbg(xudc->dev, "PLC, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_PLC);
+ switch (pls) {
+ case PORTSC_PLS_U3:
+ tegra_xudc_port_suspend(xudc);
+ break;
+ case PORTSC_PLS_U0:
+ if (xudc->gadget.speed < USB_SPEED_SUPER)
+ tegra_xudc_port_resume(xudc);
+ break;
+ case PORTSC_PLS_RESUME:
+ if (xudc->gadget.speed == USB_SPEED_SUPER)
+ tegra_xudc_port_resume(xudc);
+ break;
+ case PORTSC_PLS_INACTIVE:
+ schedule_delayed_work(&xudc->plc_reset_work,
+ msecs_to_jiffies(TOGGLE_VBUS_WAIT_MS));
+ xudc->wait_csc = true;
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (portsc & PORTSC_CEC) {
+ dev_warn(xudc->dev, "CEC, PORTSC = %#x\n", portsc);
+ clear_port_change(xudc, PORTSC_CEC);
+ }
+
+ dev_dbg(xudc->dev, "PORTSC = %#x\n", xudc_readl(xudc, PORTSC));
+}
+
+static void tegra_xudc_handle_port_status(struct tegra_xudc *xudc)
+{
+ while ((xudc_readl(xudc, PORTSC) & PORTSC_CHANGE_MASK) ||
+ (xudc_readl(xudc, PORTHALT) & PORTHALT_STCHG_REQ))
+ __tegra_xudc_handle_port_status(xudc);
+}
+
+static void tegra_xudc_handle_event(struct tegra_xudc *xudc,
+ struct tegra_xudc_trb *event)
+{
+ u32 type = trb_read_type(event);
+
+ dump_trb(xudc, "EVENT", event);
+
+ switch (type) {
+ case TRB_TYPE_PORT_STATUS_CHANGE_EVENT:
+ tegra_xudc_handle_port_status(xudc);
+ break;
+ case TRB_TYPE_TRANSFER_EVENT:
+ tegra_xudc_handle_transfer_event(xudc, event);
+ break;
+ case TRB_TYPE_SETUP_PACKET_EVENT:
+ tegra_xudc_handle_ep0_event(xudc, event);
+ break;
+ default:
+ dev_info(xudc->dev, "Unrecognized TRB type = %#x\n", type);
+ break;
+ }
+}
+
+static void tegra_xudc_process_event_ring(struct tegra_xudc *xudc)
+{
+ struct tegra_xudc_trb *event;
+ dma_addr_t erdp;
+
+ while (true) {
+ event = xudc->event_ring[xudc->event_ring_index] +
+ xudc->event_ring_deq_ptr;
+
+ if (trb_read_cycle(event) != xudc->ccs)
+ break;
+
+ tegra_xudc_handle_event(xudc, event);
+
+ xudc->event_ring_deq_ptr++;
+ if (xudc->event_ring_deq_ptr == XUDC_EVENT_RING_SIZE) {
+ xudc->event_ring_deq_ptr = 0;
+ xudc->event_ring_index++;
+ }
+
+ if (xudc->event_ring_index == XUDC_NR_EVENT_RINGS) {
+ xudc->event_ring_index = 0;
+ xudc->ccs = !xudc->ccs;
+ }
+ }
+
+ erdp = xudc->event_ring_phys[xudc->event_ring_index] +
+ xudc->event_ring_deq_ptr * sizeof(*event);
+
+ xudc_writel(xudc, upper_32_bits(erdp), ERDPHI);
+ xudc_writel(xudc, lower_32_bits(erdp) | ERDPLO_EHB, ERDPLO);
+}
+
+static irqreturn_t tegra_xudc_irq(int irq, void *data)
+{
+ struct tegra_xudc *xudc = data;
+ unsigned long flags;
+ u32 val;
+
+ val = xudc_readl(xudc, ST);
+ if (!(val & ST_IP))
+ return IRQ_NONE;
+ xudc_writel(xudc, ST_IP, ST);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ tegra_xudc_process_event_ring(xudc);
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int tegra_xudc_alloc_ep(struct tegra_xudc *xudc, unsigned int index)
+{
+ struct tegra_xudc_ep *ep = &xudc->ep[index];
+
+ ep->xudc = xudc;
+ ep->index = index;
+ ep->context = &xudc->ep_context[index];
+ INIT_LIST_HEAD(&ep->queue);
+
+ /*
+ * EP1 would be the input endpoint corresponding to EP0, but since
+ * EP0 is bi-directional, EP1 is unused.
+ */
+ if (index == 1)
+ return 0;
+
+ ep->transfer_ring = dma_pool_alloc(xudc->transfer_ring_pool,
+ GFP_KERNEL,
+ &ep->transfer_ring_phys);
+ if (!ep->transfer_ring)
+ return -ENOMEM;
+
+ if (index) {
+ snprintf(ep->name, sizeof(ep->name), "ep%u%s", index / 2,
+ (index % 2 == 0) ? "out" : "in");
+ ep->usb_ep.name = ep->name;
+ usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
+ ep->usb_ep.max_streams = 16;
+ ep->usb_ep.ops = &tegra_xudc_ep_ops;
+ ep->usb_ep.caps.type_bulk = true;
+ ep->usb_ep.caps.type_int = true;
+ if (index & 1)
+ ep->usb_ep.caps.dir_in = true;
+ else
+ ep->usb_ep.caps.dir_out = true;
+ list_add_tail(&ep->usb_ep.ep_list, &xudc->gadget.ep_list);
+ } else {
+ strscpy(ep->name, "ep0", 3);
+ ep->usb_ep.name = ep->name;
+ usb_ep_set_maxpacket_limit(&ep->usb_ep, 512);
+ ep->usb_ep.ops = &tegra_xudc_ep0_ops;
+ ep->usb_ep.caps.type_control = true;
+ ep->usb_ep.caps.dir_in = true;
+ ep->usb_ep.caps.dir_out = true;
+ }
+
+ return 0;
+}
+
+static void tegra_xudc_free_ep(struct tegra_xudc *xudc, unsigned int index)
+{
+ struct tegra_xudc_ep *ep = &xudc->ep[index];
+
+ /*
+ * EP1 would be the input endpoint corresponding to EP0, but since
+ * EP0 is bi-directional, EP1 is unused.
+ */
+ if (index == 1)
+ return;
+
+ dma_pool_free(xudc->transfer_ring_pool, ep->transfer_ring,
+ ep->transfer_ring_phys);
+}
+
+static int tegra_xudc_alloc_eps(struct tegra_xudc *xudc)
+{
+ struct usb_request *req;
+ unsigned int i;
+ int err;
+
+ xudc->ep_context =
+ dma_alloc_coherent(xudc->dev, XUDC_NR_EPS *
+ sizeof(*xudc->ep_context),
+ &xudc->ep_context_phys, GFP_KERNEL);
+ if (!xudc->ep_context)
+ return -ENOMEM;
+
+ xudc->transfer_ring_pool =
+ dmam_pool_create(dev_name(xudc->dev), xudc->dev,
+ XUDC_TRANSFER_RING_SIZE *
+ sizeof(struct tegra_xudc_trb),
+ sizeof(struct tegra_xudc_trb), 0);
+ if (!xudc->transfer_ring_pool) {
+ err = -ENOMEM;
+ goto free_ep_context;
+ }
+
+ INIT_LIST_HEAD(&xudc->gadget.ep_list);
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
+ err = tegra_xudc_alloc_ep(xudc, i);
+ if (err < 0)
+ goto free_eps;
+ }
+
+ req = tegra_xudc_ep_alloc_request(&xudc->ep[0].usb_ep, GFP_KERNEL);
+ if (!req) {
+ err = -ENOMEM;
+ goto free_eps;
+ }
+ xudc->ep0_req = to_xudc_req(req);
+
+ return 0;
+
+free_eps:
+ for (; i > 0; i--)
+ tegra_xudc_free_ep(xudc, i - 1);
+free_ep_context:
+ dma_free_coherent(xudc->dev, XUDC_NR_EPS * sizeof(*xudc->ep_context),
+ xudc->ep_context, xudc->ep_context_phys);
+ return err;
+}
+
+static void tegra_xudc_init_eps(struct tegra_xudc *xudc)
+{
+ xudc_writel(xudc, lower_32_bits(xudc->ep_context_phys), ECPLO);
+ xudc_writel(xudc, upper_32_bits(xudc->ep_context_phys), ECPHI);
+}
+
+static void tegra_xudc_free_eps(struct tegra_xudc *xudc)
+{
+ unsigned int i;
+
+ tegra_xudc_ep_free_request(&xudc->ep[0].usb_ep,
+ &xudc->ep0_req->usb_req);
+
+ for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
+ tegra_xudc_free_ep(xudc, i);
+
+ dma_free_coherent(xudc->dev, XUDC_NR_EPS * sizeof(*xudc->ep_context),
+ xudc->ep_context, xudc->ep_context_phys);
+}
+
+static int tegra_xudc_alloc_event_ring(struct tegra_xudc *xudc)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
+ xudc->event_ring[i] =
+ dma_alloc_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
+ sizeof(*xudc->event_ring[i]),
+ &xudc->event_ring_phys[i],
+ GFP_KERNEL);
+ if (!xudc->event_ring[i])
+ goto free_dma;
+ }
+
+ return 0;
+
+free_dma:
+ for (; i > 0; i--) {
+ dma_free_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
+ sizeof(*xudc->event_ring[i - 1]),
+ xudc->event_ring[i - 1],
+ xudc->event_ring_phys[i - 1]);
+ }
+ return -ENOMEM;
+}
+
+static void tegra_xudc_init_event_ring(struct tegra_xudc *xudc)
+{
+ unsigned int i;
+ u32 val;
+
+ val = xudc_readl(xudc, SPARAM);
+ val &= ~(SPARAM_ERSTMAX_MASK);
+ val |= SPARAM_ERSTMAX(XUDC_NR_EVENT_RINGS);
+ xudc_writel(xudc, val, SPARAM);
+
+ for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
+ memset(xudc->event_ring[i], 0, XUDC_EVENT_RING_SIZE *
+ sizeof(*xudc->event_ring[i]));
+
+ val = xudc_readl(xudc, ERSTSZ);
+ val &= ~(ERSTSZ_ERSTXSZ_MASK << ERSTSZ_ERSTXSZ_SHIFT(i));
+ val |= XUDC_EVENT_RING_SIZE << ERSTSZ_ERSTXSZ_SHIFT(i);
+ xudc_writel(xudc, val, ERSTSZ);
+
+ xudc_writel(xudc, lower_32_bits(xudc->event_ring_phys[i]),
+ ERSTXBALO(i));
+ xudc_writel(xudc, upper_32_bits(xudc->event_ring_phys[i]),
+ ERSTXBAHI(i));
+ }
+
+ val = lower_32_bits(xudc->event_ring_phys[0]);
+ xudc_writel(xudc, val, ERDPLO);
+ val |= EREPLO_ECS;
+ xudc_writel(xudc, val, EREPLO);
+
+ val = upper_32_bits(xudc->event_ring_phys[0]);
+ xudc_writel(xudc, val, ERDPHI);
+ xudc_writel(xudc, val, EREPHI);
+
+ xudc->ccs = true;
+ xudc->event_ring_index = 0;
+ xudc->event_ring_deq_ptr = 0;
+}
+
+static void tegra_xudc_free_event_ring(struct tegra_xudc *xudc)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
+ dma_free_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
+ sizeof(*xudc->event_ring[i]),
+ xudc->event_ring[i],
+ xudc->event_ring_phys[i]);
+ }
+}
+
+static void tegra_xudc_fpci_ipfs_init(struct tegra_xudc *xudc)
+{
+ u32 val;
+
+ if (xudc->soc->has_ipfs) {
+ val = ipfs_readl(xudc, XUSB_DEV_CONFIGURATION_0);
+ val |= XUSB_DEV_CONFIGURATION_0_EN_FPCI;
+ ipfs_writel(xudc, val, XUSB_DEV_CONFIGURATION_0);
+ usleep_range(10, 15);
+ }
+
+ /* Enable bus master */
+ val = XUSB_DEV_CFG_1_IO_SPACE_EN | XUSB_DEV_CFG_1_MEMORY_SPACE_EN |
+ XUSB_DEV_CFG_1_BUS_MASTER_EN;
+ fpci_writel(xudc, val, XUSB_DEV_CFG_1);
+
+ /* Program BAR0 space */
+ val = fpci_readl(xudc, XUSB_DEV_CFG_4);
+ val &= ~(XUSB_DEV_CFG_4_BASE_ADDR_MASK);
+ val |= xudc->phys_base & (XUSB_DEV_CFG_4_BASE_ADDR_MASK);
+
+ fpci_writel(xudc, val, XUSB_DEV_CFG_4);
+ fpci_writel(xudc, upper_32_bits(xudc->phys_base), XUSB_DEV_CFG_5);
+
+ usleep_range(100, 200);
+
+ if (xudc->soc->has_ipfs) {
+ /* Enable interrupt assertion */
+ val = ipfs_readl(xudc, XUSB_DEV_INTR_MASK_0);
+ val |= XUSB_DEV_INTR_MASK_0_IP_INT_MASK;
+ ipfs_writel(xudc, val, XUSB_DEV_INTR_MASK_0);
+ }
+}
+
+static void tegra_xudc_device_params_init(struct tegra_xudc *xudc)
+{
+ u32 val, imod;
+
+ if (xudc->soc->has_ipfs) {
+ val = xudc_readl(xudc, BLCG);
+ val |= BLCG_ALL;
+ val &= ~(BLCG_DFPCI | BLCG_UFPCI | BLCG_FE |
+ BLCG_COREPLL_PWRDN);
+ val |= BLCG_IOPLL_0_PWRDN;
+ val |= BLCG_IOPLL_1_PWRDN;
+ val |= BLCG_IOPLL_2_PWRDN;
+
+ xudc_writel(xudc, val, BLCG);
+ }
+
+ /* Set a reasonable U3 exit timer value. */
+ val = xudc_readl(xudc, SSPX_CORE_PADCTL4);
+ val &= ~(SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_MASK);
+ val |= SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3(0x5dc0);
+ xudc_writel(xudc, val, SSPX_CORE_PADCTL4);
+
+ /* Default ping LFPS tBurst is too large. */
+ val = xudc_readl(xudc, SSPX_CORE_CNT0);
+ val &= ~(SSPX_CORE_CNT0_PING_TBURST_MASK);
+ val |= SSPX_CORE_CNT0_PING_TBURST(0xa);
+ xudc_writel(xudc, val, SSPX_CORE_CNT0);
+
+ /* Default tPortConfiguration timeout is too small. */
+ val = xudc_readl(xudc, SSPX_CORE_CNT30);
+ val &= ~(SSPX_CORE_CNT30_LMPITP_TIMER_MASK);
+ val |= SSPX_CORE_CNT30_LMPITP_TIMER(0x978);
+ xudc_writel(xudc, val, SSPX_CORE_CNT30);
+
+ if (xudc->soc->lpm_enable) {
+ /* Set L1 resume duration to 95 us. */
+ val = xudc_readl(xudc, HSFSPI_COUNT13);
+ val &= ~(HSFSPI_COUNT13_U2_RESUME_K_DURATION_MASK);
+ val |= HSFSPI_COUNT13_U2_RESUME_K_DURATION(0x2c88);
+ xudc_writel(xudc, val, HSFSPI_COUNT13);
+ }
+
+ /*
+ * Compliacne suite appears to be violating polling LFPS tBurst max
+ * of 1.4us. Send 1.45us instead.
+ */
+ val = xudc_readl(xudc, SSPX_CORE_CNT32);
+ val &= ~(SSPX_CORE_CNT32_POLL_TBURST_MAX_MASK);
+ val |= SSPX_CORE_CNT32_POLL_TBURST_MAX(0xb0);
+ xudc_writel(xudc, val, SSPX_CORE_CNT32);
+
+ /* Direct HS/FS port instance to RxDetect. */
+ val = xudc_readl(xudc, CFG_DEV_FE);
+ val &= ~(CFG_DEV_FE_PORTREGSEL_MASK);
+ val |= CFG_DEV_FE_PORTREGSEL(CFG_DEV_FE_PORTREGSEL_HSFS_PI);
+ xudc_writel(xudc, val, CFG_DEV_FE);
+
+ val = xudc_readl(xudc, PORTSC);
+ val &= ~(PORTSC_CHANGE_MASK | PORTSC_PLS_MASK);
+ val |= PORTSC_LWS | PORTSC_PLS(PORTSC_PLS_RXDETECT);
+ xudc_writel(xudc, val, PORTSC);
+
+ /* Direct SS port instance to RxDetect. */
+ val = xudc_readl(xudc, CFG_DEV_FE);
+ val &= ~(CFG_DEV_FE_PORTREGSEL_MASK);
+ val |= CFG_DEV_FE_PORTREGSEL_SS_PI & CFG_DEV_FE_PORTREGSEL_MASK;
+ xudc_writel(xudc, val, CFG_DEV_FE);
+
+ val = xudc_readl(xudc, PORTSC);
+ val &= ~(PORTSC_CHANGE_MASK | PORTSC_PLS_MASK);
+ val |= PORTSC_LWS | PORTSC_PLS(PORTSC_PLS_RXDETECT);
+ xudc_writel(xudc, val, PORTSC);
+
+ /* Restore port instance. */
+ val = xudc_readl(xudc, CFG_DEV_FE);
+ val &= ~(CFG_DEV_FE_PORTREGSEL_MASK);
+ xudc_writel(xudc, val, CFG_DEV_FE);
+
+ /*
+ * Enable INFINITE_SS_RETRY to prevent device from entering
+ * Disabled.Error when attached to buggy SuperSpeed hubs.
+ */
+ val = xudc_readl(xudc, CFG_DEV_FE);
+ val |= CFG_DEV_FE_INFINITE_SS_RETRY;
+ xudc_writel(xudc, val, CFG_DEV_FE);
+
+ /* Set interrupt moderation. */
+ imod = XUDC_INTERRUPT_MODERATION_US * 4;
+ val = xudc_readl(xudc, RT_IMOD);
+ val &= ~((RT_IMOD_IMODI_MASK) | (RT_IMOD_IMODC_MASK));
+ val |= (RT_IMOD_IMODI(imod) | RT_IMOD_IMODC(imod));
+ xudc_writel(xudc, val, RT_IMOD);
+
+ /* increase SSPI transaction timeout from 32us to 512us */
+ val = xudc_readl(xudc, CFG_DEV_SSPI_XFER);
+ val &= ~(CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK);
+ val |= CFG_DEV_SSPI_XFER_ACKTIMEOUT(0xf000);
+ xudc_writel(xudc, val, CFG_DEV_SSPI_XFER);
+}
+
+static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
+{
+ int err;
+
+ err = phy_init(xudc->utmi_phy);
+ if (err < 0) {
+ dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
+ return err;
+ }
+
+ err = phy_init(xudc->usb3_phy);
+ if (err < 0) {
+ dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
+ goto exit_utmi_phy;
+ }
+
+ return 0;
+
+exit_utmi_phy:
+ phy_exit(xudc->utmi_phy);
+ return err;
+}
+
+static void tegra_xudc_phy_exit(struct tegra_xudc *xudc)
+{
+ phy_exit(xudc->usb3_phy);
+ phy_exit(xudc->utmi_phy);
+}
+
+static const char * const tegra210_xudc_supply_names[] = {
+ "hvdd-usb",
+ "avddio-usb",
+};
+
+static const char * const tegra210_xudc_clock_names[] = {
+ "dev",
+ "ss",
+ "ss_src",
+ "hs_src",
+ "fs_src",
+};
+
+static struct tegra_xudc_soc tegra210_xudc_soc_data = {
+ .supply_names = tegra210_xudc_supply_names,
+ .num_supplies = ARRAY_SIZE(tegra210_xudc_supply_names),
+ .clock_names = tegra210_xudc_clock_names,
+ .num_clks = ARRAY_SIZE(tegra210_xudc_clock_names),
+ .u1_enable = false,
+ .u2_enable = true,
+ .lpm_enable = false,
+ .invalid_seq_num = true,
+ .pls_quirk = true,
+ .port_reset_quirk = true,
+ .has_ipfs = true,
+};
+
+static const struct of_device_id tegra_xudc_of_match[] = {
+ {
+ .compatible = "nvidia,tegra210-xudc",
+ .data = &tegra210_xudc_soc_data
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tegra_xudc_of_match);
+
+static void tegra_xudc_powerdomain_remove(struct tegra_xudc *xudc)
+{
+ if (xudc->genpd_dl_ss)
+ device_link_del(xudc->genpd_dl_ss);
+ if (xudc->genpd_dl_device)
+ device_link_del(xudc->genpd_dl_device);
+ if (xudc->genpd_dev_ss)
+ dev_pm_domain_detach(xudc->genpd_dev_ss, true);
+ if (xudc->genpd_dev_device)
+ dev_pm_domain_detach(xudc->genpd_dev_device, true);
+}
+
+static int tegra_xudc_powerdomain_init(struct tegra_xudc *xudc)
+{
+ struct device *dev = xudc->dev;
+ int err;
+
+ xudc->genpd_dev_device = dev_pm_domain_attach_by_name(dev,
+ "dev");
+ if (IS_ERR(xudc->genpd_dev_device)) {
+ err = PTR_ERR(xudc->genpd_dev_device);
+ dev_err(dev, "failed to get dev pm-domain: %d\n", err);
+ return err;
+ }
+
+ xudc->genpd_dev_ss = dev_pm_domain_attach_by_name(dev, "ss");
+ if (IS_ERR(xudc->genpd_dev_ss)) {
+ err = PTR_ERR(xudc->genpd_dev_ss);
+ dev_err(dev, "failed to get superspeed pm-domain: %d\n", err);
+ return err;
+ }
+
+ xudc->genpd_dl_device = device_link_add(dev, xudc->genpd_dev_device,
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_STATELESS);
+ if (!xudc->genpd_dl_device) {
+ dev_err(dev, "adding usb device device link failed!\n");
+ return -ENODEV;
+ }
+
+ xudc->genpd_dl_ss = device_link_add(dev, xudc->genpd_dev_ss,
+ DL_FLAG_PM_RUNTIME |
+ DL_FLAG_STATELESS);
+ if (!xudc->genpd_dl_ss) {
+ dev_err(dev, "adding superspeed device link failed!\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int tegra_xudc_probe(struct platform_device *pdev)
+{
+ struct tegra_xudc *xudc;
+ struct resource *res;
+ struct usb_role_switch_desc role_sx_desc = { 0 };
+ unsigned int i;
+ int err;
+
+ xudc = devm_kzalloc(&pdev->dev, sizeof(*xudc), GFP_ATOMIC);
+ if (!xudc)
+ return -ENOMEM;
+
+ xudc->dev = &pdev->dev;
+ platform_set_drvdata(pdev, xudc);
+
+ xudc->soc = of_device_get_match_data(&pdev->dev);
+ if (!xudc->soc)
+ return -ENODEV;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
+ xudc->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(xudc->base))
+ return PTR_ERR(xudc->base);
+ xudc->phys_base = res->start;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fpci");
+ xudc->fpci = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(xudc->fpci))
+ return PTR_ERR(xudc->fpci);
+
+ if (xudc->soc->has_ipfs) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "ipfs");
+ xudc->ipfs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(xudc->ipfs))
+ return PTR_ERR(xudc->ipfs);
+ }
+
+ xudc->irq = platform_get_irq(pdev, 0);
+ if (xudc->irq < 0) {
+ dev_err(xudc->dev, "failed to get IRQ: %d\n",
+ xudc->irq);
+ return xudc->irq;
+ }
+
+ err = devm_request_irq(&pdev->dev, xudc->irq, tegra_xudc_irq, 0,
+ dev_name(&pdev->dev), xudc);
+ if (err < 0) {
+ dev_err(xudc->dev, "failed to claim IRQ#%u: %d\n", xudc->irq,
+ err);
+ return err;
+ }
+
+ xudc->clks = devm_kcalloc(&pdev->dev, xudc->soc->num_clks,
+ sizeof(*xudc->clks), GFP_KERNEL);
+ if (!xudc->clks)
+ return -ENOMEM;
+
+ for (i = 0; i < xudc->soc->num_clks; i++)
+ xudc->clks[i].id = xudc->soc->clock_names[i];
+
+ err = devm_clk_bulk_get(&pdev->dev, xudc->soc->num_clks,
+ xudc->clks);
+ if (err) {
+ dev_err(xudc->dev, "failed to request clks %d\n", err);
+ return err;
+ }
+
+ xudc->supplies = devm_kcalloc(&pdev->dev, xudc->soc->num_supplies,
+ sizeof(*xudc->supplies), GFP_KERNEL);
+ if (!xudc->supplies)
+ return -ENOMEM;
+
+ for (i = 0; i < xudc->soc->num_supplies; i++)
+ xudc->supplies[i].supply = xudc->soc->supply_names[i];
+
+ err = devm_regulator_bulk_get(&pdev->dev, xudc->soc->num_supplies,
+ xudc->supplies);
+ if (err) {
+ dev_err(xudc->dev, "failed to request regulators %d\n", err);
+ return err;
+ }
+
+ xudc->padctl = tegra_xusb_padctl_get(&pdev->dev);
+ if (IS_ERR(xudc->padctl))
+ return PTR_ERR(xudc->padctl);
+
+ err = regulator_bulk_enable(xudc->soc->num_supplies, xudc->supplies);
+ if (err) {
+ dev_err(xudc->dev, "failed to enable regulators %d\n", err);
+ goto put_padctl;
+ }
+
+ xudc->usb3_phy = devm_phy_optional_get(&pdev->dev, "usb3");
+ if (IS_ERR(xudc->usb3_phy)) {
+ err = PTR_ERR(xudc->usb3_phy);
+ dev_err(xudc->dev, "failed to get usb3 phy: %d\n", err);
+ goto disable_regulator;
+ }
+
+ xudc->utmi_phy = devm_phy_optional_get(&pdev->dev, "usb2");
+ if (IS_ERR(xudc->utmi_phy)) {
+ err = PTR_ERR(xudc->utmi_phy);
+ dev_err(xudc->dev, "failed to get usb2 phy: %d\n", err);
+ goto disable_regulator;
+ }
+
+ err = tegra_xudc_powerdomain_init(xudc);
+ if (err)
+ goto put_powerdomains;
+
+ err = tegra_xudc_phy_init(xudc);
+ if (err)
+ goto put_powerdomains;
+
+ err = tegra_xudc_alloc_event_ring(xudc);
+ if (err)
+ goto disable_phy;
+
+ err = tegra_xudc_alloc_eps(xudc);
+ if (err)
+ goto free_event_ring;
+
+ spin_lock_init(&xudc->lock);
+
+ init_completion(&xudc->disconnect_complete);
+
+ INIT_WORK(&xudc->usb_role_sw_work, tegra_xudc_usb_role_sw_work);
+
+ INIT_DELAYED_WORK(&xudc->plc_reset_work, tegra_xudc_plc_reset_work);
+
+ INIT_DELAYED_WORK(&xudc->port_reset_war_work,
+ tegra_xudc_port_reset_war_work);
+
+ if (of_property_read_bool(xudc->dev->of_node, "usb-role-switch")) {
+ role_sx_desc.set = tegra_xudc_usb_role_sw_set;
+ role_sx_desc.fwnode = dev_fwnode(xudc->dev);
+
+ xudc->usb_role_sw = usb_role_switch_register(xudc->dev,
+ &role_sx_desc);
+ if (IS_ERR(xudc->usb_role_sw)) {
+ err = PTR_ERR(xudc->usb_role_sw);
+ dev_err(xudc->dev, "Failed to register USB role SW: %d",
+ err);
+ goto free_eps;
+ }
+ } else {
+ /* Set the mode as device mode and this keeps phy always ON */
+ dev_info(xudc->dev, "Set usb role to device mode always");
+ schedule_work(&xudc->usb_role_sw_work);
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ xudc->gadget.ops = &tegra_xudc_gadget_ops;
+ xudc->gadget.ep0 = &xudc->ep[0].usb_ep;
+ xudc->gadget.name = "tegra-xudc";
+ xudc->gadget.max_speed = USB_SPEED_SUPER;
+
+ err = usb_add_gadget_udc(&pdev->dev, &xudc->gadget);
+ if (err) {
+ dev_err(&pdev->dev, "failed to add USB gadget: %d\n", err);
+ goto free_eps;
+ }
+
+ return 0;
+
+free_eps:
+ tegra_xudc_free_eps(xudc);
+free_event_ring:
+ tegra_xudc_free_event_ring(xudc);
+disable_phy:
+ tegra_xudc_phy_exit(xudc);
+put_powerdomains:
+ tegra_xudc_powerdomain_remove(xudc);
+disable_regulator:
+ regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
+put_padctl:
+ tegra_xusb_padctl_put(xudc->padctl);
+
+ return err;
+}
+
+static int tegra_xudc_remove(struct platform_device *pdev)
+{
+ struct tegra_xudc *xudc = platform_get_drvdata(pdev);
+
+ pm_runtime_get_sync(xudc->dev);
+
+ cancel_delayed_work(&xudc->plc_reset_work);
+
+ if (xudc->usb_role_sw) {
+ usb_role_switch_unregister(xudc->usb_role_sw);
+ cancel_work_sync(&xudc->usb_role_sw_work);
+ }
+
+ usb_del_gadget_udc(&xudc->gadget);
+
+ tegra_xudc_free_eps(xudc);
+ tegra_xudc_free_event_ring(xudc);
+
+ tegra_xudc_powerdomain_remove(xudc);
+
+ regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
+
+ phy_power_off(xudc->utmi_phy);
+ phy_power_off(xudc->usb3_phy);
+
+ tegra_xudc_phy_exit(xudc);
+
+ pm_runtime_disable(xudc->dev);
+ pm_runtime_put(xudc->dev);
+
+ tegra_xusb_padctl_put(xudc->padctl);
+
+ return 0;
+}
+
+static int __maybe_unused tegra_xudc_powergate(struct tegra_xudc *xudc)
+{
+ unsigned long flags;
+
+ dev_dbg(xudc->dev, "entering ELPG\n");
+
+ spin_lock_irqsave(&xudc->lock, flags);
+
+ xudc->powergated = true;
+ xudc->saved_regs.ctrl = xudc_readl(xudc, CTRL);
+ xudc->saved_regs.portpm = xudc_readl(xudc, PORTPM);
+ xudc_writel(xudc, 0, CTRL);
+
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ clk_bulk_disable_unprepare(xudc->soc->num_clks, xudc->clks);
+
+ regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
+
+ dev_dbg(xudc->dev, "entering ELPG done\n");
+ return 0;
+}
+
+static int __maybe_unused tegra_xudc_unpowergate(struct tegra_xudc *xudc)
+{
+ unsigned long flags;
+ int err;
+
+ dev_dbg(xudc->dev, "exiting ELPG\n");
+
+ err = regulator_bulk_enable(xudc->soc->num_supplies,
+ xudc->supplies);
+ if (err < 0)
+ return err;
+
+ err = clk_bulk_prepare_enable(xudc->soc->num_clks, xudc->clks);
+ if (err < 0)
+ return err;
+
+ tegra_xudc_fpci_ipfs_init(xudc);
+
+ tegra_xudc_device_params_init(xudc);
+
+ tegra_xudc_init_event_ring(xudc);
+
+ tegra_xudc_init_eps(xudc);
+
+ xudc_writel(xudc, xudc->saved_regs.portpm, PORTPM);
+ xudc_writel(xudc, xudc->saved_regs.ctrl, CTRL);
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ xudc->powergated = false;
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ dev_dbg(xudc->dev, "exiting ELPG done\n");
+ return 0;
+}
+
+static int __maybe_unused tegra_xudc_suspend(struct device *dev)
+{
+ struct tegra_xudc *xudc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ xudc->suspended = true;
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ flush_work(&xudc->usb_role_sw_work);
+
+ /* Forcibly disconnect before powergating. */
+ tegra_xudc_device_mode_off(xudc);
+
+ if (!pm_runtime_status_suspended(dev))
+ tegra_xudc_powergate(xudc);
+
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+static int __maybe_unused tegra_xudc_resume(struct device *dev)
+{
+ struct tegra_xudc *xudc = dev_get_drvdata(dev);
+ unsigned long flags;
+ int err;
+
+ err = tegra_xudc_unpowergate(xudc);
+ if (err < 0)
+ return err;
+
+ spin_lock_irqsave(&xudc->lock, flags);
+ xudc->suspended = false;
+ spin_unlock_irqrestore(&xudc->lock, flags);
+
+ schedule_work(&xudc->usb_role_sw_work);
+
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+
+static int __maybe_unused tegra_xudc_runtime_suspend(struct device *dev)
+{
+ struct tegra_xudc *xudc = dev_get_drvdata(dev);
+
+ return tegra_xudc_powergate(xudc);
+}
+
+static int __maybe_unused tegra_xudc_runtime_resume(struct device *dev)
+{
+ struct tegra_xudc *xudc = dev_get_drvdata(dev);
+
+ return tegra_xudc_unpowergate(xudc);
+}
+
+static const struct dev_pm_ops tegra_xudc_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_xudc_suspend, tegra_xudc_resume)
+ SET_RUNTIME_PM_OPS(tegra_xudc_runtime_suspend,
+ tegra_xudc_runtime_resume, NULL)
+};
+
+static struct platform_driver tegra_xudc_driver = {
+ .probe = tegra_xudc_probe,
+ .remove = tegra_xudc_remove,
+ .driver = {
+ .name = "tegra-xudc",
+ .pm = &tegra_xudc_pm_ops,
+ .of_match_table = tegra_xudc_of_match,
+ },
+};
+module_platform_driver(tegra_xudc_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra XUSB Device Controller");
+MODULE_AUTHOR("Andrew Bresticker <abrestic@xxxxxxxxxxxx>");
+MODULE_AUTHOR("Hui Fu <hfu@xxxxxxxxxx>");
+MODULE_AUTHOR("Nagarjuna Kristam <nkristam@xxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.7.4

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