[PATCH v5 3/3] dmaengine: qcom: Add GPI dma driver
From: Vinod Koul
Date: Tue Nov 03 2020 - 06:27:01 EST
This controller provides DMAengine capabilities for a variety of peripheral
buses such as I2C, UART, and SPI. By using GPI dmaengine driver, bus
drivers can use a standardize interface that is protocol independent to
transfer data between memory and peripheral.
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
---
drivers/dma/qcom/Kconfig | 12 +
drivers/dma/qcom/Makefile | 1 +
drivers/dma/qcom/gpi.c | 2303 ++++++++++++++++++++++++++++++
include/linux/dma/qcom-gpi-dma.h | 83 ++
4 files changed, 2399 insertions(+)
create mode 100644 drivers/dma/qcom/gpi.c
create mode 100644 include/linux/dma/qcom-gpi-dma.h
diff --git a/drivers/dma/qcom/Kconfig b/drivers/dma/qcom/Kconfig
index 3bcb689162c6..f925296b0c85 100644
--- a/drivers/dma/qcom/Kconfig
+++ b/drivers/dma/qcom/Kconfig
@@ -8,6 +8,18 @@ config QCOM_BAM_DMA
Enable support for the QCOM BAM DMA controller. This controller
provides DMA capabilities for a variety of on-chip devices.
+config QCOM_GPI_DMA
+ tristate "Qualcomm Technologies GPI DMA support"
+ depends on ARCH_QCOM
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for the QCOM GPI DMA controller. This controller
+ provides DMA capabilities for a variety of peripheral buses such
+ as I2C, UART, and SPI. By using GPI dmaengine driver, bus drivers
+ can use a standardize interface that is protocol independent to
+ transfer data between DDR and peripheral.
+
config QCOM_HIDMA_MGMT
tristate "Qualcomm Technologies HIDMA Management support"
select DMA_ENGINE
diff --git a/drivers/dma/qcom/Makefile b/drivers/dma/qcom/Makefile
index 1ae92da88b0c..f33f027dd0fc 100644
--- a/drivers/dma/qcom/Makefile
+++ b/drivers/dma/qcom/Makefile
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_QCOM_BAM_DMA) += bam_dma.o
+obj-$(CONFIG_QCOM_GPI_DMA) += gpi.o
obj-$(CONFIG_QCOM_HIDMA_MGMT) += hdma_mgmt.o
hdma_mgmt-objs := hidma_mgmt.o hidma_mgmt_sys.o
obj-$(CONFIG_QCOM_HIDMA) += hdma.o
diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c
new file mode 100644
index 000000000000..d2334f535de2
--- /dev/null
+++ b/drivers/dma/qcom/gpi.c
@@ -0,0 +1,2303 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#include <dt-bindings/dma/qcom-gpi.h>
+#include <linux/bitfield.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/dma/qcom-gpi-dma.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include "../dmaengine.h"
+#include "../virt-dma.h"
+
+#define TRE_TYPE_DMA 0x10
+#define TRE_TYPE_GO 0x20
+#define TRE_TYPE_CONFIG0 0x22
+
+/* TRE flags */
+#define TRE_FLAGS_CHAIN BIT(0)
+#define TRE_FLAGS_IEOB BIT(8)
+#define TRE_FLAGS_IEOT BIT(9)
+#define TRE_FLAGS_BEI BIT(10)
+#define TRE_FLAGS_LINK BIT(11)
+#define TRE_FLAGS_TYPE GENMASK(23, 16)
+
+/* SPI CONFIG0 WD0 */
+#define TRE_SPI_C0_WORD_SZ GENMASK(4, 0)
+#define TRE_SPI_C0_LOOPBACK BIT(8)
+#define TRE_SPI_C0_CS BIT(11)
+#define TRE_SPI_C0_CPHA BIT(12)
+#define TRE_SPI_C0_CPOL BIT(13)
+#define TRE_SPI_C0_TX_PACK BIT(24)
+#define TRE_SPI_C0_RX_PACK BIT(25)
+
+/* CONFIG0 WD2 */
+#define TRE_C0_CLK_DIV GENMASK(11, 0)
+#define TRE_C0_CLK_SRC GENMASK(19, 16)
+
+/* SPI GO WD0 */
+#define TRE_SPI_GO_CMD GENMASK(4, 0)
+#define TRE_SPI_GO_CS GENMASK(10, 8)
+#define TRE_SPI_GO_FRAG BIT(26)
+
+/* GO WD2 */
+#define TRE_RX_LEN GENMASK(23, 0)
+
+/* I2C Config0 WD0 */
+#define TRE_I2C_C0_TLOW GENMASK(7, 0)
+#define TRE_I2C_C0_THIGH GENMASK(15, 8)
+#define TRE_I2C_C0_TCYL GENMASK(23, 16)
+#define TRE_I2C_C0_TX_PACK BIT(24)
+#define TRE_I2C_C0_RX_PACK BIT(25)
+
+/* I2C GO WD0 */
+#define TRE_I2C_GO_CMD GENMASK(4, 0)
+#define TRE_I2C_GO_ADDR GENMASK(14, 8)
+#define TRE_I2C_GO_STRETCH BIT(26)
+
+/* DMA TRE */
+#define TRE_DMA_LEN GENMASK(23, 0)
+
+/* Register offsets from gpi-top */
+#define GPII_n_CH_k_CNTXT_0_OFFS(n, k) (0x20000 + (0x4000 * (n)) + (0x80 * (k)))
+#define GPII_n_CH_k_CNTXT_0_EL_SIZE GENMASK(31, 24)
+#define GPII_n_CH_k_CNTXT_0_CHSTATE GENMASK(23, 20)
+#define GPII_n_CH_k_CNTXT_0_ERIDX GENMASK(18, 14)
+#define GPII_n_CH_k_CNTXT_0_DIR BIT(3)
+#define GPII_n_CH_k_CNTXT_0_PROTO GENMASK(2, 0)
+
+#define GPII_n_CH_k_CNTXT_0(el_size, erindex, dir, chtype_proto) \
+ (FIELD_PREP(GPII_n_CH_k_CNTXT_0_EL_SIZE, el_size) | \
+ FIELD_PREP(GPII_n_CH_k_CNTXT_0_ERIDX, erindex) | \
+ FIELD_PREP(GPII_n_CH_k_CNTXT_0_DIR, dir) | \
+ FIELD_PREP(GPII_n_CH_k_CNTXT_0_PROTO, chtype_proto))
+
+#define GPI_CHTYPE_DIR_IN (0)
+#define GPI_CHTYPE_DIR_OUT (1)
+
+#define GPI_CHTYPE_PROTO_GPI (0x2)
+
+#define GPII_n_CH_k_DOORBELL_0_OFFS(n, k) (0x22000 + (0x4000 * (n)) + (0x8 * (k)))
+#define GPII_n_CH_CMD_OFFS(n) (0x23008 + (0x4000 * (n)))
+#define GPII_n_CH_CMD_OPCODE GENMASK(31, 24)
+#define GPII_n_CH_CMD_CHID GENMASK(7, 0)
+#define GPII_n_CH_CMD(opcode, chid) \
+ (FIELD_PREP(GPII_n_CH_CMD_OPCODE, opcode) | \
+ FIELD_PREP(GPII_n_CH_CMD_CHID, chid))
+
+#define GPII_n_CH_CMD_ALLOCATE (0)
+#define GPII_n_CH_CMD_START (1)
+#define GPII_n_CH_CMD_STOP (2)
+#define GPII_n_CH_CMD_RESET (9)
+#define GPII_n_CH_CMD_DE_ALLOC (10)
+#define GPII_n_CH_CMD_UART_SW_STALE (32)
+#define GPII_n_CH_CMD_UART_RFR_READY (33)
+#define GPII_n_CH_CMD_UART_RFR_NOT_READY (34)
+
+/* EV Context Array */
+#define GPII_n_EV_CH_k_CNTXT_0_OFFS(n, k) (0x21000 + (0x4000 * (n)) + (0x80 * (k)))
+#define GPII_n_EV_k_CNTXT_0_EL_SIZE GENMASK(31, 24)
+#define GPII_n_EV_k_CNTXT_0_CHSTATE GENMASK(23, 20)
+#define GPII_n_EV_k_CNTXT_0_INTYPE BIT(16)
+#define GPII_n_EV_k_CNTXT_0_CHTYPE GENMASK(3, 0)
+
+#define GPII_n_EV_k_CNTXT_0(el_size, inttype, chtype) \
+ (FIELD_PREP(GPII_n_EV_k_CNTXT_0_EL_SIZE, el_size) | \
+ FIELD_PREP(GPII_n_EV_k_CNTXT_0_INTYPE, inttype) | \
+ FIELD_PREP(GPII_n_EV_k_CNTXT_0_CHTYPE, chtype))
+
+#define GPI_INTTYPE_IRQ (1)
+#define GPI_CHTYPE_GPI_EV (0x2)
+
+enum CNTXT_OFFS {
+ CNTXT_0_CONFIG = 0x0,
+ CNTXT_1_R_LENGTH = 0x4,
+ CNTXT_2_RING_BASE_LSB = 0x8,
+ CNTXT_3_RING_BASE_MSB = 0xC,
+ CNTXT_4_RING_RP_LSB = 0x10,
+ CNTXT_5_RING_RP_MSB = 0x14,
+ CNTXT_6_RING_WP_LSB = 0x18,
+ CNTXT_7_RING_WP_MSB = 0x1C,
+ CNTXT_8_RING_INT_MOD = 0x20,
+ CNTXT_9_RING_INTVEC = 0x24,
+ CNTXT_10_RING_MSI_LSB = 0x28,
+ CNTXT_11_RING_MSI_MSB = 0x2C,
+ CNTXT_12_RING_RP_UPDATE_LSB = 0x30,
+ CNTXT_13_RING_RP_UPDATE_MSB = 0x34,
+};
+
+#define GPII_n_EV_CH_k_DOORBELL_0_OFFS(n, k) (0x22100 + (0x4000 * (n)) + (0x8 * (k)))
+#define GPII_n_EV_CH_CMD_OFFS(n) (0x23010 + (0x4000 * (n)))
+#define GPII_n_EV_CMD_OPCODE GENMASK(31, 24)
+#define GPII_n_EV_CMD_CHID GENMASK(7, 0)
+#define GPII_n_EV_CMD(opcode, chid) \
+ (FIELD_PREP(GPII_n_EV_CMD_OPCODE, opcode) | \
+ FIELD_PREP(GPII_n_EV_CMD_CHID, chid))
+
+#define GPII_n_EV_CH_CMD_ALLOCATE (0x00)
+#define GPII_n_EV_CH_CMD_RESET (0x09)
+#define GPII_n_EV_CH_CMD_DE_ALLOC (0x0A)
+
+#define GPII_n_CNTXT_TYPE_IRQ_OFFS(n) (0x23080 + (0x4000 * (n)))
+
+/* mask type register */
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(n) (0x23088 + (0x4000 * (n)))
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK GENMASK(6, 0)
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_GENERAL BIT(6)
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB BIT(3)
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB BIT(2)
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL BIT(1)
+#define GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL BIT(0)
+
+#define GPII_n_CNTXT_SRC_GPII_CH_IRQ_OFFS(n) (0x23090 + (0x4000 * (n)))
+#define GPII_n_CNTXT_SRC_EV_CH_IRQ_OFFS(n) (0x23094 + (0x4000 * (n)))
+
+/* Mask channel control interrupt register */
+#define GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(n) (0x23098 + (0x4000 * (n)))
+#define GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK GENMASK(1, 0)
+
+/* Mask event control interrupt register */
+#define GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(n) (0x2309C + (0x4000 * (n)))
+#define GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK BIT(0)
+
+#define GPII_n_CNTXT_SRC_CH_IRQ_CLR_OFFS(n) (0x230A0 + (0x4000 * (n)))
+#define GPII_n_CNTXT_SRC_EV_CH_IRQ_CLR_OFFS(n) (0x230A4 + (0x4000 * (n)))
+
+/* Mask event interrupt register */
+#define GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(n) (0x230B8 + (0x4000 * (n)))
+#define GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK BIT(0)
+
+#define GPII_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(n) (0x230C0 + (0x4000 * (n)))
+#define GPII_n_CNTXT_GLOB_IRQ_STTS_OFFS(n) (0x23100 + (0x4000 * (n)))
+#define GPI_GLOB_IRQ_ERROR_INT_MSK BIT(0)
+
+/* GPII specific Global - Enable bit register */
+#define GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(n) (0x23108 + (0x4000 * (n)))
+#define GPII_n_CNTXT_GLOB_IRQ_CLR_OFFS(n) (0x23110 + (0x4000 * (n)))
+#define GPII_n_CNTXT_GPII_IRQ_STTS_OFFS(n) (0x23118 + (0x4000 * (n)))
+
+/* GPII general interrupt - Enable bit register */
+#define GPII_n_CNTXT_GPII_IRQ_EN_OFFS(n) (0x23120 + (0x4000 * (n)))
+#define GPII_n_CNTXT_GPII_IRQ_EN_BMSK GENMASK(3, 0)
+
+#define GPII_n_CNTXT_GPII_IRQ_CLR_OFFS(n) (0x23128 + (0x4000 * (n)))
+
+/* GPII Interrupt Type register */
+#define GPII_n_CNTXT_INTSET_OFFS(n) (0x23180 + (0x4000 * (n)))
+#define GPII_n_CNTXT_INTSET_BMSK BIT(0)
+
+#define GPII_n_CNTXT_MSI_BASE_LSB_OFFS(n) (0x23188 + (0x4000 * (n)))
+#define GPII_n_CNTXT_MSI_BASE_MSB_OFFS(n) (0x2318C + (0x4000 * (n)))
+#define GPII_n_CNTXT_SCRATCH_0_OFFS(n) (0x23400 + (0x4000 * (n)))
+#define GPII_n_CNTXT_SCRATCH_1_OFFS(n) (0x23404 + (0x4000 * (n)))
+
+#define GPII_n_ERROR_LOG_OFFS(n) (0x23200 + (0x4000 * (n)))
+
+/* QOS Registers */
+#define GPII_n_CH_k_QOS_OFFS(n, k) (0x2005C + (0x4000 * (n)) + (0x80 * (k)))
+
+/* Scratch registers */
+#define GPII_n_CH_k_SCRATCH_0_OFFS(n, k) (0x20060 + (0x4000 * (n)) + (0x80 * (k)))
+#define GPII_n_CH_k_SCRATCH_0_SEID GENMASK(2, 0)
+#define GPII_n_CH_k_SCRATCH_0_PROTO GENMASK(7, 4)
+#define GPII_n_CH_k_SCRATCH_0_PAIR GENMASK(20, 16)
+#define GPII_n_CH_k_SCRATCH_0(pair, proto, seid) \
+ (FIELD_PREP(GPII_n_CH_k_SCRATCH_0_PAIR, pair) | \
+ FIELD_PREP(GPII_n_CH_k_SCRATCH_0_PROTO, proto) | \
+ FIELD_PREP(GPII_n_CH_k_SCRATCH_0_SEID, seid))
+#define GPII_n_CH_k_SCRATCH_1_OFFS(n, k) (0x20064 + (0x4000 * (n)) + (0x80 * (k)))
+#define GPII_n_CH_k_SCRATCH_2_OFFS(n, k) (0x20068 + (0x4000 * (n)) + (0x80 * (k)))
+#define GPII_n_CH_k_SCRATCH_3_OFFS(n, k) (0x2006C + (0x4000 * (n)) + (0x80 * (k)))
+
+struct __packed gpi_tre {
+ u32 dword[4];
+};
+
+enum msm_gpi_tce_code {
+ MSM_GPI_TCE_SUCCESS = 1,
+ MSM_GPI_TCE_EOT = 2,
+ MSM_GPI_TCE_EOB = 4,
+ MSM_GPI_TCE_UNEXP_ERR = 16,
+};
+
+#define CMD_TIMEOUT_MS (250)
+
+#define MAX_CHANNELS_PER_GPII (2)
+#define GPI_TX_CHAN (0)
+#define GPI_RX_CHAN (1)
+#define STATE_IGNORE (U32_MAX)
+#define EV_FACTOR (2)
+#define REQ_OF_DMA_ARGS (5) /* # of arguments required from client */
+#define CHAN_TRES 64
+
+struct __packed xfer_compl_event {
+ u64 ptr;
+ u32 length:24;
+ u8 code;
+ u16 status;
+ u8 type;
+ u8 chid;
+};
+
+struct __packed immediate_data_event {
+ u8 data_bytes[8];
+ u8 length:4;
+ u8 resvd:4;
+ u16 tre_index;
+ u8 code;
+ u16 status;
+ u8 type;
+ u8 chid;
+};
+
+struct __packed qup_notif_event {
+ u32 status;
+ u32 time;
+ u32 count:24;
+ u8 resvd;
+ u16 resvd1;
+ u8 type;
+ u8 chid;
+};
+
+struct __packed gpi_ere {
+ u32 dword[4];
+};
+
+enum GPI_EV_TYPE {
+ XFER_COMPLETE_EV_TYPE = 0x22,
+ IMMEDIATE_DATA_EV_TYPE = 0x30,
+ QUP_NOTIF_EV_TYPE = 0x31,
+ STALE_EV_TYPE = 0xFF,
+};
+
+union __packed gpi_event {
+ struct __packed xfer_compl_event xfer_compl_event;
+ struct __packed immediate_data_event immediate_data_event;
+ struct __packed qup_notif_event qup_notif_event;
+ struct __packed gpi_ere gpi_ere;
+};
+
+enum gpii_irq_settings {
+ DEFAULT_IRQ_SETTINGS,
+ MASK_IEOB_SETTINGS,
+};
+
+enum gpi_ev_state {
+ DEFAULT_EV_CH_STATE = 0,
+ EV_STATE_NOT_ALLOCATED = DEFAULT_EV_CH_STATE,
+ EV_STATE_ALLOCATED,
+ MAX_EV_STATES
+};
+
+static const char *const gpi_ev_state_str[MAX_EV_STATES] = {
+ [EV_STATE_NOT_ALLOCATED] = "NOT ALLOCATED",
+ [EV_STATE_ALLOCATED] = "ALLOCATED",
+};
+
+#define TO_GPI_EV_STATE_STR(_state) (((_state) >= MAX_EV_STATES) ? \
+ "INVALID" : gpi_ev_state_str[(_state)])
+
+enum gpi_ch_state {
+ DEFAULT_CH_STATE = 0x0,
+ CH_STATE_NOT_ALLOCATED = DEFAULT_CH_STATE,
+ CH_STATE_ALLOCATED = 0x1,
+ CH_STATE_STARTED = 0x2,
+ CH_STATE_STOPPED = 0x3,
+ CH_STATE_STOP_IN_PROC = 0x4,
+ CH_STATE_ERROR = 0xf,
+ MAX_CH_STATES
+};
+
+enum gpi_cmd {
+ GPI_CH_CMD_BEGIN,
+ GPI_CH_CMD_ALLOCATE = GPI_CH_CMD_BEGIN,
+ GPI_CH_CMD_START,
+ GPI_CH_CMD_STOP,
+ GPI_CH_CMD_RESET,
+ GPI_CH_CMD_DE_ALLOC,
+ GPI_CH_CMD_UART_SW_STALE,
+ GPI_CH_CMD_UART_RFR_READY,
+ GPI_CH_CMD_UART_RFR_NOT_READY,
+ GPI_CH_CMD_END = GPI_CH_CMD_UART_RFR_NOT_READY,
+ GPI_EV_CMD_BEGIN,
+ GPI_EV_CMD_ALLOCATE = GPI_EV_CMD_BEGIN,
+ GPI_EV_CMD_RESET,
+ GPI_EV_CMD_DEALLOC,
+ GPI_EV_CMD_END = GPI_EV_CMD_DEALLOC,
+ GPI_MAX_CMD,
+};
+
+#define IS_CHAN_CMD(_cmd) ((_cmd) <= GPI_CH_CMD_END)
+
+static const char *const gpi_cmd_str[GPI_MAX_CMD] = {
+ [GPI_CH_CMD_ALLOCATE] = "CH ALLOCATE",
+ [GPI_CH_CMD_START] = "CH START",
+ [GPI_CH_CMD_STOP] = "CH STOP",
+ [GPI_CH_CMD_RESET] = "CH_RESET",
+ [GPI_CH_CMD_DE_ALLOC] = "DE ALLOC",
+ [GPI_CH_CMD_UART_SW_STALE] = "UART SW STALE",
+ [GPI_CH_CMD_UART_RFR_READY] = "UART RFR READY",
+ [GPI_CH_CMD_UART_RFR_NOT_READY] = "UART RFR NOT READY",
+ [GPI_EV_CMD_ALLOCATE] = "EV ALLOCATE",
+ [GPI_EV_CMD_RESET] = "EV RESET",
+ [GPI_EV_CMD_DEALLOC] = "EV DEALLOC",
+};
+
+#define TO_GPI_CMD_STR(_cmd) (((_cmd) >= GPI_MAX_CMD) ? "INVALID" : \
+ gpi_cmd_str[(_cmd)])
+
+/*
+ * @DISABLE_STATE: no register access allowed
+ * @CONFIG_STATE: client has configured the channel
+ * @PREP_HARDWARE: register access is allowed
+ * however, no processing EVENTS
+ * @ACTIVE_STATE: channels are fully operational
+ * @PREPARE_TERMINATE: graceful termination of channels
+ * register access is allowed
+ * @PAUSE_STATE: channels are active, but not processing any events
+ */
+enum gpi_pm_state {
+ DISABLE_STATE,
+ CONFIG_STATE,
+ PREPARE_HARDWARE,
+ ACTIVE_STATE,
+ PREPARE_TERMINATE,
+ PAUSE_STATE,
+ MAX_PM_STATE
+};
+
+#define REG_ACCESS_VALID(_pm_state) ((_pm_state) >= PREPARE_HARDWARE)
+
+static const char *const gpi_pm_state_str[MAX_PM_STATE] = {
+ [DISABLE_STATE] = "DISABLE",
+ [CONFIG_STATE] = "CONFIG",
+ [PREPARE_HARDWARE] = "PREPARE HARDWARE",
+ [ACTIVE_STATE] = "ACTIVE",
+ [PREPARE_TERMINATE] = "PREPARE TERMINATE",
+ [PAUSE_STATE] = "PAUSE",
+};
+
+#define TO_GPI_PM_STR(_state) (((_state) >= MAX_PM_STATE) ? \
+ "INVALID" : gpi_pm_state_str[(_state)])
+
+static const struct {
+ enum gpi_cmd gpi_cmd;
+ u32 opcode;
+ u32 state;
+} gpi_cmd_info[GPI_MAX_CMD] = {
+ {
+ GPI_CH_CMD_ALLOCATE,
+ GPII_n_CH_CMD_ALLOCATE,
+ CH_STATE_ALLOCATED,
+ },
+ {
+ GPI_CH_CMD_START,
+ GPII_n_CH_CMD_START,
+ CH_STATE_STARTED,
+ },
+ {
+ GPI_CH_CMD_STOP,
+ GPII_n_CH_CMD_STOP,
+ CH_STATE_STOPPED,
+ },
+ {
+ GPI_CH_CMD_RESET,
+ GPII_n_CH_CMD_RESET,
+ CH_STATE_ALLOCATED,
+ },
+ {
+ GPI_CH_CMD_DE_ALLOC,
+ GPII_n_CH_CMD_DE_ALLOC,
+ CH_STATE_NOT_ALLOCATED,
+ },
+ {
+ GPI_CH_CMD_UART_SW_STALE,
+ GPII_n_CH_CMD_UART_SW_STALE,
+ STATE_IGNORE,
+ },
+ {
+ GPI_CH_CMD_UART_RFR_READY,
+ GPII_n_CH_CMD_UART_RFR_READY,
+ STATE_IGNORE,
+ },
+ {
+ GPI_CH_CMD_UART_RFR_NOT_READY,
+ GPII_n_CH_CMD_UART_RFR_NOT_READY,
+ STATE_IGNORE,
+ },
+ {
+ GPI_EV_CMD_ALLOCATE,
+ GPII_n_EV_CH_CMD_ALLOCATE,
+ EV_STATE_ALLOCATED,
+ },
+ {
+ GPI_EV_CMD_RESET,
+ GPII_n_EV_CH_CMD_RESET,
+ EV_STATE_ALLOCATED,
+ },
+ {
+ GPI_EV_CMD_DEALLOC,
+ GPII_n_EV_CH_CMD_DE_ALLOC,
+ EV_STATE_NOT_ALLOCATED,
+ },
+};
+
+struct gpi_ring {
+ void *pre_aligned;
+ size_t alloc_size;
+ phys_addr_t phys_addr;
+ dma_addr_t dma_handle;
+ void *base;
+ void *wp;
+ void *rp;
+ u32 len;
+ u32 el_size;
+ u32 elements;
+ bool configured;
+};
+
+struct gpi_dev {
+ struct dma_device dma_device;
+ struct device *dev;
+ struct resource *res;
+ void __iomem *regs;
+ void __iomem *ee_base; /*ee register base address*/
+ u32 max_gpii; /* maximum # of gpii instances available per gpi block */
+ u32 gpii_mask; /* gpii instances available for apps */
+ u32 ev_factor; /* ev ring length factor */
+ struct gpii *gpiis;
+};
+
+struct reg_info {
+ char *name;
+ u32 offset;
+ u32 val;
+};
+
+struct gchan {
+ struct virt_dma_chan vc;
+ u32 chid;
+ u32 seid;
+ u32 protocol;
+ struct gpii *gpii;
+ enum gpi_ch_state ch_state;
+ enum gpi_pm_state pm_state;
+ void __iomem *ch_cntxt_base_reg;
+ void __iomem *ch_cntxt_db_reg;
+ void __iomem *ch_cmd_reg;
+ u32 dir;
+ struct gpi_ring ch_ring;
+ void *config;
+};
+
+struct gpii {
+ u32 gpii_id;
+ struct gchan gchan[MAX_CHANNELS_PER_GPII];
+ struct gpi_dev *gpi_dev;
+ int irq;
+ void __iomem *regs; /* points to gpi top */
+ void __iomem *ev_cntxt_base_reg;
+ void __iomem *ev_cntxt_db_reg;
+ void __iomem *ev_ring_rp_lsb_reg;
+ void __iomem *ev_cmd_reg;
+ void __iomem *ieob_clr_reg;
+ struct mutex ctrl_lock;
+ enum gpi_ev_state ev_state;
+ bool configured_irq;
+ enum gpi_pm_state pm_state;
+ rwlock_t pm_lock;
+ struct gpi_ring ev_ring;
+ struct tasklet_struct ev_task; /* event processing tasklet */
+ struct completion cmd_completion;
+ enum gpi_cmd gpi_cmd;
+ u32 cntxt_type_irq_msk;
+ bool ieob_set;
+};
+
+#define MAX_TRE 3
+
+struct gpi_desc {
+ struct virt_dma_desc vd;
+ size_t len;
+ void *db; /* DB register to program */
+ struct gchan *gchan;
+ struct gpi_tre tre[MAX_TRE];
+ u32 num_tre;
+};
+
+static const u32 GPII_CHAN_DIR[MAX_CHANNELS_PER_GPII] = {
+ GPI_CHTYPE_DIR_OUT, GPI_CHTYPE_DIR_IN
+};
+
+static irqreturn_t gpi_handle_irq(int irq, void *data);
+static void gpi_ring_recycle_ev_element(struct gpi_ring *ring);
+static int gpi_ring_add_element(struct gpi_ring *ring, void **wp);
+static void gpi_process_events(struct gpii *gpii);
+
+static inline struct gchan *to_gchan(struct dma_chan *dma_chan)
+{
+ return container_of(dma_chan, struct gchan, vc.chan);
+}
+
+static inline struct gpi_desc *to_gpi_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct gpi_desc, vd);
+}
+
+static inline phys_addr_t to_physical(const struct gpi_ring *const ring,
+ void *addr)
+{
+ return ring->phys_addr + (addr - ring->base);
+}
+
+static inline void *to_virtual(const struct gpi_ring *const ring, phys_addr_t addr)
+{
+ return ring->base + (addr - ring->phys_addr);
+}
+
+static inline u32 gpi_read_reg(struct gpii *gpii, void __iomem *addr)
+{
+ return readl_relaxed(addr);
+}
+
+static inline void gpi_write_reg(struct gpii *gpii, void __iomem *addr, u32 val)
+{
+ writel_relaxed(val, addr);
+}
+
+/* gpi_write_reg_field - write to specific bit field */
+static inline void gpi_write_reg_field(struct gpii *gpii, void __iomem *addr,
+ u32 mask, u32 shift, u32 val)
+{
+ u32 tmp = gpi_read_reg(gpii, addr);
+
+ tmp &= ~mask;
+ val = tmp | ((val << shift) & mask);
+ gpi_write_reg(gpii, addr, val);
+}
+
+static inline void
+gpi_update_reg(struct gpii *gpii, u32 offset, u32 mask, u32 val)
+{
+ void __iomem *addr = gpii->regs + offset;
+ u32 tmp = gpi_read_reg(gpii, addr);
+
+ tmp &= ~mask;
+ tmp |= u32_encode_bits(val, mask);
+
+ gpi_write_reg(gpii, addr, tmp);
+}
+
+static void gpi_disable_interrupts(struct gpii *gpii)
+{
+ gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_GPII_IRQ_EN_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_GPII_IRQ_EN_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_GPII_IRQ_EN_BMSK, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_INTSET_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_INTSET_BMSK, 0);
+
+ gpii->cntxt_type_irq_msk = 0;
+ devm_free_irq(gpii->gpi_dev->dev, gpii->irq, gpii);
+ gpii->configured_irq = false;
+}
+
+/* configure and enable interrupts */
+static int gpi_config_interrupts(struct gpii *gpii, enum gpii_irq_settings settings, bool mask)
+{
+ const u32 enable = (GPII_n_CNTXT_TYPE_IRQ_MSK_GENERAL |
+ GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB |
+ GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB |
+ GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL |
+ GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL);
+ int ret;
+
+ if (!gpii->configured_irq) {
+ ret = devm_request_irq(gpii->gpi_dev->dev, gpii->irq,
+ gpi_handle_irq, IRQF_TRIGGER_HIGH,
+ "gpi-dma", gpii);
+ if (ret < 0) {
+ dev_err(gpii->gpi_dev->dev, "error request irq:%d ret:%d\n",
+ gpii->irq, ret);
+ return ret;
+ }
+ }
+
+ if (settings == MASK_IEOB_SETTINGS) {
+ /*
+ * GPII only uses one EV ring per gpii so we can globally
+ * enable/disable IEOB interrupt
+ */
+ if (mask)
+ gpii->cntxt_type_irq_msk |= GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB;
+ else
+ gpii->cntxt_type_irq_msk &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB);
+ gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, gpii->cntxt_type_irq_msk);
+ } else {
+ gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, enable);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK,
+ GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK,
+ GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK,
+ GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK);
+ gpi_update_reg(gpii, GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_GPII_IRQ_EN_BMSK,
+ GPII_n_CNTXT_GPII_IRQ_EN_BMSK);
+ gpi_update_reg(gpii, GPII_n_CNTXT_GPII_IRQ_EN_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_GPII_IRQ_EN_BMSK, GPII_n_CNTXT_GPII_IRQ_EN_BMSK);
+ gpi_update_reg(gpii, GPII_n_CNTXT_MSI_BASE_LSB_OFFS(gpii->gpii_id), U32_MAX, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_MSI_BASE_MSB_OFFS(gpii->gpii_id), U32_MAX, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SCRATCH_0_OFFS(gpii->gpii_id), U32_MAX, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_SCRATCH_1_OFFS(gpii->gpii_id), U32_MAX, 0);
+ gpi_update_reg(gpii, GPII_n_CNTXT_INTSET_OFFS(gpii->gpii_id),
+ GPII_n_CNTXT_INTSET_BMSK, 1);
+ gpi_update_reg(gpii, GPII_n_ERROR_LOG_OFFS(gpii->gpii_id), U32_MAX, 0);
+
+ gpii->cntxt_type_irq_msk = enable;
+ }
+
+ gpii->configured_irq = true;
+ return 0;
+}
+
+/* Sends gpii event or channel command */
+static int gpi_send_cmd(struct gpii *gpii, struct gchan *gchan,
+ enum gpi_cmd gpi_cmd)
+{
+ u32 chid = MAX_CHANNELS_PER_GPII;
+ unsigned long timeout;
+ void __iomem *cmd_reg;
+ u32 cmd;
+
+ if (gpi_cmd >= GPI_MAX_CMD)
+ return -EINVAL;
+ if (IS_CHAN_CMD(gpi_cmd))
+ chid = gchan->chid;
+
+ dev_dbg(gpii->gpi_dev->dev,
+ "sending cmd: %s:%u\n", TO_GPI_CMD_STR(gpi_cmd), chid);
+
+ /* send opcode and wait for completion */
+ reinit_completion(&gpii->cmd_completion);
+ gpii->gpi_cmd = gpi_cmd;
+
+ cmd_reg = IS_CHAN_CMD(gpi_cmd) ? gchan->ch_cmd_reg : gpii->ev_cmd_reg;
+ cmd = IS_CHAN_CMD(gpi_cmd) ? GPII_n_CH_CMD(gpi_cmd_info[gpi_cmd].opcode, chid) :
+ GPII_n_EV_CMD(gpi_cmd_info[gpi_cmd].opcode, 0);
+ gpi_write_reg(gpii, cmd_reg, cmd);
+ timeout = wait_for_completion_timeout(&gpii->cmd_completion,
+ msecs_to_jiffies(CMD_TIMEOUT_MS));
+ if (!timeout) {
+ dev_err(gpii->gpi_dev->dev, "cmd: %s completion timeout:%u\n",
+ TO_GPI_CMD_STR(gpi_cmd), chid);
+ return -EIO;
+ }
+
+ /* confirm new ch state is correct , if the cmd is a state change cmd */
+ if (gpi_cmd_info[gpi_cmd].state == STATE_IGNORE)
+ return 0;
+
+ if (IS_CHAN_CMD(gpi_cmd) && gchan->ch_state == gpi_cmd_info[gpi_cmd].state)
+ return 0;
+
+ if (!IS_CHAN_CMD(gpi_cmd) && gpii->ev_state == gpi_cmd_info[gpi_cmd].state)
+ return 0;
+
+ return -EIO;
+}
+
+/* program transfer ring DB register */
+static inline void gpi_write_ch_db(struct gchan *gchan,
+ struct gpi_ring *ring, void *wp)
+{
+ struct gpii *gpii = gchan->gpii;
+ phys_addr_t p_wp;
+
+ p_wp = to_physical(ring, wp);
+ gpi_write_reg(gpii, gchan->ch_cntxt_db_reg, p_wp);
+}
+
+/* program event ring DB register */
+static inline void gpi_write_ev_db(struct gpii *gpii,
+ struct gpi_ring *ring, void *wp)
+{
+ phys_addr_t p_wp;
+
+ p_wp = ring->phys_addr + (wp - ring->base);
+ gpi_write_reg(gpii, gpii->ev_cntxt_db_reg, p_wp);
+}
+
+/* process transfer completion interrupt */
+static void gpi_process_ieob(struct gpii *gpii)
+{
+ gpi_write_reg(gpii, gpii->ieob_clr_reg, BIT(0));
+
+ gpi_config_interrupts(gpii, MASK_IEOB_SETTINGS, 0);
+ tasklet_hi_schedule(&gpii->ev_task);
+}
+
+/* process channel control interrupt */
+static void gpi_process_ch_ctrl_irq(struct gpii *gpii)
+{
+ u32 gpii_id = gpii->gpii_id;
+ u32 offset = GPII_n_CNTXT_SRC_GPII_CH_IRQ_OFFS(gpii_id);
+ u32 ch_irq = gpi_read_reg(gpii, gpii->regs + offset);
+ struct gchan *gchan;
+ u32 chid, state;
+
+ /* clear the status */
+ offset = GPII_n_CNTXT_SRC_CH_IRQ_CLR_OFFS(gpii_id);
+ gpi_write_reg(gpii, gpii->regs + offset, (u32)ch_irq);
+
+ for (chid = 0; chid < MAX_CHANNELS_PER_GPII; chid++) {
+ if (!(BIT(chid) & ch_irq))
+ continue;
+
+ gchan = &gpii->gchan[chid];
+ state = gpi_read_reg(gpii, gchan->ch_cntxt_base_reg +
+ CNTXT_0_CONFIG);
+ state = FIELD_GET(GPII_n_CH_k_CNTXT_0_CHSTATE, state);
+
+ /*
+ * CH_CMD_DEALLOC cmd always successful. However cmd does
+ * not change hardware status. So overwriting software state
+ * to default state.
+ */
+ if (gpii->gpi_cmd == GPI_CH_CMD_DE_ALLOC)
+ state = DEFAULT_CH_STATE;
+ gchan->ch_state = state;
+
+ /*
+ * Triggering complete all if ch_state is not a stop in process.
+ * Stop in process is a transition state and we will wait for
+ * stop interrupt before notifying.
+ */
+ if (gchan->ch_state != CH_STATE_STOP_IN_PROC)
+ complete_all(&gpii->cmd_completion);
+ }
+}
+
+/* processing gpi general error interrupts */
+static void gpi_process_gen_err_irq(struct gpii *gpii)
+{
+ u32 gpii_id = gpii->gpii_id;
+ u32 offset = GPII_n_CNTXT_GPII_IRQ_STTS_OFFS(gpii_id);
+ u32 irq_stts = gpi_read_reg(gpii, gpii->regs + offset);
+
+ /* clear the status */
+ dev_dbg(gpii->gpi_dev->dev, "irq_stts:0x%x\n", irq_stts);
+
+ /* Clear the register */
+ offset = GPII_n_CNTXT_GPII_IRQ_CLR_OFFS(gpii_id);
+ gpi_write_reg(gpii, gpii->regs + offset, irq_stts);
+}
+
+/* processing gpi level error interrupts */
+static void gpi_process_glob_err_irq(struct gpii *gpii)
+{
+ u32 gpii_id = gpii->gpii_id;
+ u32 offset = GPII_n_CNTXT_GLOB_IRQ_STTS_OFFS(gpii_id);
+ u32 irq_stts = gpi_read_reg(gpii, gpii->regs + offset);
+
+ offset = GPII_n_CNTXT_GLOB_IRQ_CLR_OFFS(gpii_id);
+ gpi_write_reg(gpii, gpii->regs + offset, irq_stts);
+
+ /* only error interrupt should be set */
+ if (irq_stts & ~GPI_GLOB_IRQ_ERROR_INT_MSK) {
+ dev_err(gpii->gpi_dev->dev, "invalid error status:0x%x\n", irq_stts);
+ return;
+ }
+
+ offset = GPII_n_ERROR_LOG_OFFS(gpii_id);
+ gpi_write_reg(gpii, gpii->regs + offset, 0);
+}
+
+/* gpii interrupt handler */
+static irqreturn_t gpi_handle_irq(int irq, void *data)
+{
+ struct gpii *gpii = data;
+ u32 gpii_id = gpii->gpii_id;
+ u32 type, offset;
+ unsigned long flags;
+
+ read_lock_irqsave(&gpii->pm_lock, flags);
+
+ /*
+ * States are out of sync to receive interrupt
+ * while software state is in DISABLE state, bailing out.
+ */
+ if (!REG_ACCESS_VALID(gpii->pm_state)) {
+ dev_err(gpii->gpi_dev->dev, "receive interrupt while in %s state\n",
+ TO_GPI_PM_STR(gpii->pm_state));
+ goto exit_irq;
+ }
+
+ offset = GPII_n_CNTXT_TYPE_IRQ_OFFS(gpii->gpii_id);
+ type = gpi_read_reg(gpii, gpii->regs + offset);
+
+ do {
+ /* global gpii error */
+ if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB) {
+ gpi_process_glob_err_irq(gpii);
+ type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB);
+ }
+
+ /* transfer complete interrupt */
+ if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB) {
+ gpi_process_ieob(gpii);
+ type &= ~GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB;
+ }
+
+ /* event control irq */
+ if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL) {
+ u32 ev_state;
+ u32 ev_ch_irq;
+
+ dev_dbg(gpii->gpi_dev->dev,
+ "processing EV CTRL interrupt\n");
+ offset = GPII_n_CNTXT_SRC_EV_CH_IRQ_OFFS(gpii_id);
+ ev_ch_irq = gpi_read_reg(gpii, gpii->regs + offset);
+
+ offset = GPII_n_CNTXT_SRC_EV_CH_IRQ_CLR_OFFS
+ (gpii_id);
+ gpi_write_reg(gpii, gpii->regs + offset, ev_ch_irq);
+ ev_state = gpi_read_reg(gpii, gpii->ev_cntxt_base_reg +
+ CNTXT_0_CONFIG);
+ ev_state = FIELD_GET(GPII_n_EV_k_CNTXT_0_CHSTATE, ev_state);
+
+ /*
+ * CMD EV_CMD_DEALLOC is always successful. However
+ * cmd does not change hardware status. So overwriting
+ * software state to default state.
+ */
+ if (gpii->gpi_cmd == GPI_EV_CMD_DEALLOC)
+ ev_state = DEFAULT_EV_CH_STATE;
+
+ gpii->ev_state = ev_state;
+ dev_dbg(gpii->gpi_dev->dev, "setting EV state to %s\n",
+ TO_GPI_EV_STATE_STR(gpii->ev_state));
+ complete_all(&gpii->cmd_completion);
+ type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL);
+ }
+
+ /* channel control irq */
+ if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL) {
+ dev_dbg(gpii->gpi_dev->dev, "process CH CTRL interrupts\n");
+ gpi_process_ch_ctrl_irq(gpii);
+ type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL);
+ }
+
+ if (type) {
+ dev_err(gpii->gpi_dev->dev, "Unhandled interrupt status:0x%x\n", type);
+ gpi_process_gen_err_irq(gpii);
+ goto exit_irq;
+ }
+
+ offset = GPII_n_CNTXT_TYPE_IRQ_OFFS(gpii->gpii_id);
+ type = gpi_read_reg(gpii, gpii->regs + offset);
+ } while (type);
+
+exit_irq:
+ read_unlock_irqrestore(&gpii->pm_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+/* process DMA Immediate completion data events */
+static void gpi_process_imed_data_event(struct gchan *gchan,
+ struct immediate_data_event *imed_event)
+{
+ struct gpii *gpii = gchan->gpii;
+ struct gpi_ring *ch_ring = &gchan->ch_ring;
+ void *tre = ch_ring->base + (ch_ring->el_size * imed_event->tre_index);
+ struct dmaengine_result result;
+ struct gpi_desc *gpi_desc;
+ struct virt_dma_desc *vd;
+ unsigned long flags;
+ u32 chid;
+
+ /*
+ * If channel not active don't process event
+ */
+ if (gchan->pm_state != ACTIVE_STATE) {
+ dev_err(gpii->gpi_dev->dev, "skipping processing event because ch @ %s state\n",
+ TO_GPI_PM_STR(gchan->pm_state));
+ return;
+ }
+
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ vd = vchan_next_desc(&gchan->vc);
+ if (!vd) {
+ struct gpi_ere *gpi_ere;
+ struct gpi_tre *gpi_tre;
+
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+ dev_dbg(gpii->gpi_dev->dev, "event without a pending descriptor!\n");
+ gpi_ere = (struct gpi_ere *)imed_event;
+ dev_dbg(gpii->gpi_dev->dev,
+ "Event: %08x %08x %08x %08x\n",
+ gpi_ere->dword[0], gpi_ere->dword[1],
+ gpi_ere->dword[2], gpi_ere->dword[3]);
+ gpi_tre = tre;
+ dev_dbg(gpii->gpi_dev->dev,
+ "Pending TRE: %08x %08x %08x %08x\n",
+ gpi_tre->dword[0], gpi_tre->dword[1],
+ gpi_tre->dword[2], gpi_tre->dword[3]);
+ return;
+ }
+ gpi_desc = to_gpi_desc(vd);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+
+ /*
+ * RP pointed by Event is to last TRE processed,
+ * we need to update ring rp to tre + 1
+ */
+ tre += ch_ring->el_size;
+ if (tre >= (ch_ring->base + ch_ring->len))
+ tre = ch_ring->base;
+ ch_ring->rp = tre;
+
+ /* make sure rp updates are immediately visible to all cores */
+ smp_wmb();
+
+ chid = imed_event->chid;
+ if (imed_event->code == MSM_GPI_TCE_EOT && gpii->ieob_set) {
+ if (chid == GPI_RX_CHAN)
+ goto gpi_free_desc;
+ else
+ return;
+ }
+
+ if (imed_event->code == MSM_GPI_TCE_UNEXP_ERR)
+ result.result = DMA_TRANS_ABORTED;
+ else
+ result.result = DMA_TRANS_NOERROR;
+ result.residue = gpi_desc->len - imed_event->length;
+
+ dma_cookie_complete(&vd->tx);
+ dmaengine_desc_get_callback_invoke(&vd->tx, &result);
+
+gpi_free_desc:
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ list_del(&vd->node);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+ kfree(gpi_desc);
+ gpi_desc = NULL;
+}
+
+/* processing transfer completion events */
+static void gpi_process_xfer_compl_event(struct gchan *gchan,
+ struct xfer_compl_event *compl_event)
+{
+ struct gpii *gpii = gchan->gpii;
+ struct gpi_ring *ch_ring = &gchan->ch_ring;
+ void *ev_rp = to_virtual(ch_ring, compl_event->ptr);
+ struct virt_dma_desc *vd;
+ struct gpi_desc *gpi_desc;
+ struct dmaengine_result result;
+ unsigned long flags;
+ u32 chid;
+
+ /* only process events on active channel */
+ if (unlikely(gchan->pm_state != ACTIVE_STATE)) {
+ dev_err(gpii->gpi_dev->dev, "skipping processing event because ch @ %s state\n",
+ TO_GPI_PM_STR(gchan->pm_state));
+ return;
+ }
+
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ vd = vchan_next_desc(&gchan->vc);
+ if (!vd) {
+ struct gpi_ere *gpi_ere;
+
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+ dev_err(gpii->gpi_dev->dev, "Event without a pending descriptor!\n");
+ gpi_ere = (struct gpi_ere *)compl_event;
+ dev_err(gpii->gpi_dev->dev,
+ "Event: %08x %08x %08x %08x\n",
+ gpi_ere->dword[0], gpi_ere->dword[1],
+ gpi_ere->dword[2], gpi_ere->dword[3]);
+ return;
+ }
+
+ gpi_desc = to_gpi_desc(vd);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+
+ /*
+ * RP pointed by Event is to last TRE processed,
+ * we need to update ring rp to ev_rp + 1
+ */
+ ev_rp += ch_ring->el_size;
+ if (ev_rp >= (ch_ring->base + ch_ring->len))
+ ev_rp = ch_ring->base;
+ ch_ring->rp = ev_rp;
+
+ /* update must be visible to other cores */
+ smp_wmb();
+
+ chid = compl_event->chid;
+ if (compl_event->code == MSM_GPI_TCE_EOT && gpii->ieob_set) {
+ if (chid == GPI_RX_CHAN)
+ goto gpi_free_desc;
+ else
+ return;
+ }
+
+ if (compl_event->code == MSM_GPI_TCE_UNEXP_ERR) {
+ dev_err(gpii->gpi_dev->dev, "Error in Transaction\n");
+ result.result = DMA_TRANS_ABORTED;
+ } else {
+ dev_dbg(gpii->gpi_dev->dev, "Transaction Success\n");
+ result.result = DMA_TRANS_NOERROR;
+ }
+ result.residue = gpi_desc->len - compl_event->length;
+ dev_dbg(gpii->gpi_dev->dev, "Residue %d\n", result.residue);
+
+ dma_cookie_complete(&vd->tx);
+ dmaengine_desc_get_callback_invoke(&vd->tx, &result);
+
+gpi_free_desc:
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ list_del(&vd->node);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+ kfree(gpi_desc);
+ gpi_desc = NULL;
+}
+
+/* process all events */
+static void gpi_process_events(struct gpii *gpii)
+{
+ struct gpi_ring *ev_ring = &gpii->ev_ring;
+ phys_addr_t cntxt_rp;
+ void *rp;
+ union gpi_event *gpi_event;
+ struct gchan *gchan;
+ u32 chid, type;
+
+ cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
+ rp = to_virtual(ev_ring, cntxt_rp);
+
+ do {
+ while (rp != ev_ring->rp) {
+ gpi_event = ev_ring->rp;
+ chid = gpi_event->xfer_compl_event.chid;
+ type = gpi_event->xfer_compl_event.type;
+
+ dev_dbg(gpii->gpi_dev->dev,
+ "Event: CHID:%u, type:%x %08x %08x %08x %08x\n",
+ chid, type, gpi_event->gpi_ere.dword[0],
+ gpi_event->gpi_ere.dword[1], gpi_event->gpi_ere.dword[2],
+ gpi_event->gpi_ere.dword[3]);
+
+ switch (type) {
+ case XFER_COMPLETE_EV_TYPE:
+ gchan = &gpii->gchan[chid];
+ gpi_process_xfer_compl_event(gchan,
+ &gpi_event->xfer_compl_event);
+ break;
+ case STALE_EV_TYPE:
+ dev_dbg(gpii->gpi_dev->dev, "stale event, not processing\n");
+ break;
+ case IMMEDIATE_DATA_EV_TYPE:
+ gchan = &gpii->gchan[chid];
+ gpi_process_imed_data_event(gchan,
+ &gpi_event->immediate_data_event);
+ break;
+ case QUP_NOTIF_EV_TYPE:
+ dev_dbg(gpii->gpi_dev->dev, "QUP_NOTIF_EV_TYPE\n");
+ break;
+ default:
+ dev_dbg(gpii->gpi_dev->dev,
+ "not supported event type:0x%x\n", type);
+ }
+ gpi_ring_recycle_ev_element(ev_ring);
+ }
+ gpi_write_ev_db(gpii, ev_ring, ev_ring->wp);
+
+ /* clear pending IEOB events */
+ gpi_write_reg(gpii, gpii->ieob_clr_reg, BIT(0));
+
+ cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
+ rp = to_virtual(ev_ring, cntxt_rp);
+
+ } while (rp != ev_ring->rp);
+}
+
+/* processing events using tasklet */
+static void gpi_ev_tasklet(unsigned long data)
+{
+ struct gpii *gpii = (struct gpii *)data;
+
+ read_lock_bh(&gpii->pm_lock);
+ if (!REG_ACCESS_VALID(gpii->pm_state)) {
+ read_unlock_bh(&gpii->pm_lock);
+ dev_err(gpii->gpi_dev->dev, "not processing any events, pm_state:%s\n",
+ TO_GPI_PM_STR(gpii->pm_state));
+ return;
+ }
+
+ /* process the events */
+ gpi_process_events(gpii);
+
+ /* enable IEOB, switching back to interrupts */
+ gpi_config_interrupts(gpii, MASK_IEOB_SETTINGS, 1);
+ read_unlock_bh(&gpii->pm_lock);
+}
+
+/* marks all pending events for the channel as stale */
+static void gpi_mark_stale_events(struct gchan *gchan)
+{
+ struct gpii *gpii = gchan->gpii;
+ struct gpi_ring *ev_ring = &gpii->ev_ring;
+ u32 cntxt_rp, local_rp;
+ void *ev_rp;
+
+ cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
+
+ ev_rp = ev_ring->rp;
+ local_rp = (u32)to_physical(ev_ring, ev_rp);
+ while (local_rp != cntxt_rp) {
+ union gpi_event *gpi_event = ev_rp;
+ u32 chid = gpi_event->xfer_compl_event.chid;
+
+ if (chid == gchan->chid)
+ gpi_event->xfer_compl_event.type = STALE_EV_TYPE;
+ ev_rp += ev_ring->el_size;
+ if (ev_rp >= (ev_ring->base + ev_ring->len))
+ ev_rp = ev_ring->base;
+ cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
+ local_rp = (u32)to_physical(ev_ring, ev_rp);
+ }
+}
+
+/* reset sw state and issue channel reset or de-alloc */
+static int gpi_reset_chan(struct gchan *gchan, enum gpi_cmd gpi_cmd)
+{
+ struct gpii *gpii = gchan->gpii;
+ struct gpi_ring *ch_ring = &gchan->ch_ring;
+ unsigned long flags;
+ LIST_HEAD(list);
+ int ret;
+
+ ret = gpi_send_cmd(gpii, gchan, gpi_cmd);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
+ TO_GPI_CMD_STR(gpi_cmd), ret);
+ return ret;
+ }
+
+ /* initialize the local ring ptrs */
+ ch_ring->rp = ch_ring->base;
+ ch_ring->wp = ch_ring->base;
+
+ /* visible to other cores */
+ smp_wmb();
+
+ /* check event ring for any stale events */
+ write_lock_irq(&gpii->pm_lock);
+ gpi_mark_stale_events(gchan);
+
+ /* remove all async descriptors */
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ vchan_get_all_descriptors(&gchan->vc, &list);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+ write_unlock_irq(&gpii->pm_lock);
+ vchan_dma_desc_free_list(&gchan->vc, &list);
+
+ return 0;
+}
+
+static int gpi_start_chan(struct gchan *gchan)
+{
+ struct gpii *gpii = gchan->gpii;
+ int ret;
+
+ ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_START);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
+ TO_GPI_CMD_STR(GPI_CH_CMD_START), ret);
+ return ret;
+ }
+
+ /* gpii CH is active now */
+ write_lock_irq(&gpii->pm_lock);
+ gchan->pm_state = ACTIVE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+ return 0;
+}
+
+static int gpi_stop_chan(struct gchan *gchan)
+{
+ struct gpii *gpii = gchan->gpii;
+ int ret;
+
+ ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_STOP);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
+ TO_GPI_CMD_STR(GPI_CH_CMD_STOP), ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/* allocate and configure the transfer channel */
+static int gpi_alloc_chan(struct gchan *chan, bool send_alloc_cmd)
+{
+ struct gpii *gpii = chan->gpii;
+ struct gpi_ring *ring = &chan->ch_ring;
+ int ret;
+ u32 id = gpii->gpii_id;
+ u32 chid = chan->chid;
+ u32 pair_chid = !chid;
+
+ if (send_alloc_cmd) {
+ ret = gpi_send_cmd(gpii, chan, GPI_CH_CMD_ALLOCATE);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
+ TO_GPI_CMD_STR(GPI_CH_CMD_ALLOCATE), ret);
+ return ret;
+ }
+ }
+
+ gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_0_CONFIG,
+ GPII_n_CH_k_CNTXT_0(ring->el_size, 0, chan->dir, GPI_CHTYPE_PROTO_GPI));
+ gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_1_R_LENGTH, ring->len);
+ gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_2_RING_BASE_LSB, ring->phys_addr);
+ gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_3_RING_BASE_MSB,
+ upper_32_bits(ring->phys_addr));
+ gpi_write_reg(gpii, chan->ch_cntxt_db_reg + CNTXT_5_RING_RP_MSB - CNTXT_4_RING_RP_LSB,
+ upper_32_bits(ring->phys_addr));
+ gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_0_OFFS(id, chid),
+ GPII_n_CH_k_SCRATCH_0(pair_chid, chan->protocol, chan->seid));
+ gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_1_OFFS(id, chid), 0);
+ gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_2_OFFS(id, chid), 0);
+ gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_3_OFFS(id, chid), 0);
+ gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_QOS_OFFS(id, chid), 1);
+
+ /* flush all the writes */
+ wmb();
+ return 0;
+}
+
+/* allocate and configure event ring */
+static int gpi_alloc_ev_chan(struct gpii *gpii)
+{
+ struct gpi_ring *ring = &gpii->ev_ring;
+ void __iomem *base = gpii->ev_cntxt_base_reg;
+ int ret;
+
+ ret = gpi_send_cmd(gpii, NULL, GPI_EV_CMD_ALLOCATE);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "error with cmd:%s ret:%d\n",
+ TO_GPI_CMD_STR(GPI_EV_CMD_ALLOCATE), ret);
+ return ret;
+ }
+
+ /* program event context */
+ gpi_write_reg(gpii, base + CNTXT_0_CONFIG,
+ GPII_n_EV_k_CNTXT_0(ring->el_size, GPI_INTTYPE_IRQ, GPI_CHTYPE_GPI_EV));
+ gpi_write_reg(gpii, base + CNTXT_1_R_LENGTH, ring->len);
+ gpi_write_reg(gpii, base + CNTXT_2_RING_BASE_LSB, lower_32_bits(ring->phys_addr));
+ gpi_write_reg(gpii, base + CNTXT_3_RING_BASE_MSB, upper_32_bits(ring->phys_addr));
+ gpi_write_reg(gpii, gpii->ev_cntxt_db_reg + CNTXT_5_RING_RP_MSB - CNTXT_4_RING_RP_LSB,
+ upper_32_bits(ring->phys_addr));
+ gpi_write_reg(gpii, base + CNTXT_8_RING_INT_MOD, 0);
+ gpi_write_reg(gpii, base + CNTXT_10_RING_MSI_LSB, 0);
+ gpi_write_reg(gpii, base + CNTXT_11_RING_MSI_MSB, 0);
+ gpi_write_reg(gpii, base + CNTXT_8_RING_INT_MOD, 0);
+ gpi_write_reg(gpii, base + CNTXT_12_RING_RP_UPDATE_LSB, 0);
+ gpi_write_reg(gpii, base + CNTXT_13_RING_RP_UPDATE_MSB, 0);
+
+ /* add events to ring */
+ ring->wp = (ring->base + ring->len - ring->el_size);
+
+ /* flush all the writes */
+ wmb();
+
+ /* gpii is active now */
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = ACTIVE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+ gpi_write_ev_db(gpii, ring, ring->wp);
+
+ return 0;
+}
+
+/* calculate # of ERE/TRE available to queue */
+static int gpi_ring_num_elements_avail(const struct gpi_ring * const ring)
+{
+ int elements = 0;
+
+ if (ring->wp < ring->rp) {
+ elements = ((ring->rp - ring->wp) / ring->el_size) - 1;
+ } else {
+ elements = (ring->rp - ring->base) / ring->el_size;
+ elements += ((ring->base + ring->len - ring->wp) / ring->el_size) - 1;
+ }
+
+ return elements;
+}
+
+static int gpi_ring_add_element(struct gpi_ring *ring, void **wp)
+{
+ if (gpi_ring_num_elements_avail(ring) <= 0)
+ return -ENOMEM;
+
+ *wp = ring->wp;
+ ring->wp += ring->el_size;
+ if (ring->wp >= (ring->base + ring->len))
+ ring->wp = ring->base;
+
+ /* visible to other cores */
+ smp_wmb();
+
+ return 0;
+}
+
+static void gpi_ring_recycle_ev_element(struct gpi_ring *ring)
+{
+ /* Update the WP */
+ ring->wp += ring->el_size;
+ if (ring->wp >= (ring->base + ring->len))
+ ring->wp = ring->base;
+
+ /* Update the RP */
+ ring->rp += ring->el_size;
+ if (ring->rp >= (ring->base + ring->len))
+ ring->rp = ring->base;
+
+ /* visible to other cores */
+ smp_wmb();
+}
+
+static void gpi_free_ring(struct gpi_ring *ring,
+ struct gpii *gpii)
+{
+ dma_free_coherent(gpii->gpi_dev->dev, ring->alloc_size,
+ ring->pre_aligned, ring->dma_handle);
+ memset(ring, 0, sizeof(*ring));
+}
+
+/* allocate memory for transfer and event rings */
+static int gpi_alloc_ring(struct gpi_ring *ring, u32 elements,
+ u32 el_size, struct gpii *gpii)
+{
+ u64 len = elements * el_size;
+ int bit;
+
+ /* ring len must be power of 2 */
+ bit = find_last_bit((unsigned long *)&len, 32);
+ if (((1 << bit) - 1) & len)
+ bit++;
+ len = 1 << bit;
+ ring->alloc_size = (len + (len - 1));
+ dev_dbg(gpii->gpi_dev->dev,
+ "#el:%u el_size:%u len:%u actual_len:%llu alloc_size:%lu\n",
+ elements, el_size, (elements * el_size), len,
+ ring->alloc_size);
+
+ ring->pre_aligned = dma_alloc_coherent(gpii->gpi_dev->dev,
+ ring->alloc_size,
+ &ring->dma_handle, GFP_KERNEL);
+ if (!ring->pre_aligned) {
+ dev_err(gpii->gpi_dev->dev, "could not alloc size:%lu mem for ring\n",
+ ring->alloc_size);
+ return -ENOMEM;
+ }
+
+ /* align the physical mem */
+ ring->phys_addr = (ring->dma_handle + (len - 1)) & ~(len - 1);
+ ring->base = ring->pre_aligned + (ring->phys_addr - ring->dma_handle);
+ ring->rp = ring->base;
+ ring->wp = ring->base;
+ ring->len = len;
+ ring->el_size = el_size;
+ ring->elements = ring->len / ring->el_size;
+ memset(ring->base, 0, ring->len);
+ ring->configured = true;
+
+ /* update to other cores */
+ smp_wmb();
+
+ dev_dbg(gpii->gpi_dev->dev,
+ "phy_pre:0x%0llx phy_alig:0x%0llx len:%u el_size:%u elements:%u\n",
+ ring->dma_handle, ring->phys_addr, ring->len,
+ ring->el_size, ring->elements);
+
+ return 0;
+}
+
+/* copy tre into transfer ring */
+static void gpi_queue_xfer(struct gpii *gpii, struct gchan *gchan,
+ struct gpi_tre *gpi_tre, void **wp)
+{
+ struct gpi_tre *ch_tre;
+ int ret;
+
+ /* get next tre location we can copy */
+ ret = gpi_ring_add_element(&gchan->ch_ring, (void **)&ch_tre);
+ if (unlikely(ret)) {
+ dev_err(gpii->gpi_dev->dev, "Error adding ring element to xfer ring\n");
+ return;
+ }
+
+ /* copy the tre info */
+ memcpy(ch_tre, gpi_tre, sizeof(*ch_tre));
+ *wp = ch_tre;
+}
+
+/* reset and restart transfer channel */
+static int gpi_terminate_all(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ int schid, echid, i;
+ int ret = 0;
+
+ mutex_lock(&gpii->ctrl_lock);
+
+ /*
+ * treat both channels as a group if its protocol is not UART
+ * STOP, RESET, or START needs to be in lockstep
+ */
+ schid = (gchan->protocol == QCOM_GPI_UART) ? gchan->chid : 0;
+ echid = (gchan->protocol == QCOM_GPI_UART) ? schid + 1 : MAX_CHANNELS_PER_GPII;
+
+ /* stop the channel */
+ for (i = schid; i < echid; i++) {
+ gchan = &gpii->gchan[i];
+
+ /* disable ch state so no more TRE processing */
+ write_lock_irq(&gpii->pm_lock);
+ gchan->pm_state = PREPARE_TERMINATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+ /* send command to Stop the channel */
+ ret = gpi_stop_chan(gchan);
+ }
+
+ /* reset the channels (clears any pending tre) */
+ for (i = schid; i < echid; i++) {
+ gchan = &gpii->gchan[i];
+
+ ret = gpi_reset_chan(gchan, GPI_CH_CMD_RESET);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error resetting channel ret:%d\n", ret);
+ goto terminate_exit;
+ }
+
+ /* reprogram channel CNTXT */
+ ret = gpi_alloc_chan(gchan, false);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error alloc_channel ret:%d\n", ret);
+ goto terminate_exit;
+ }
+ }
+
+ /* restart the channels */
+ for (i = schid; i < echid; i++) {
+ gchan = &gpii->gchan[i];
+
+ ret = gpi_start_chan(gchan);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error Starting Channel ret:%d\n", ret);
+ goto terminate_exit;
+ }
+ }
+
+terminate_exit:
+ mutex_unlock(&gpii->ctrl_lock);
+ return ret;
+}
+
+/* pause dma transfer for all channels */
+static int gpi_pause(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ int i, ret;
+
+ mutex_lock(&gpii->ctrl_lock);
+
+ /*
+ * pause/resume are per gpii not per channel, so
+ * client needs to call pause only once
+ */
+ if (gpii->pm_state == PAUSE_STATE) {
+ dev_dbg(gpii->gpi_dev->dev, "channel is already paused\n");
+ mutex_unlock(&gpii->ctrl_lock);
+ return 0;
+ }
+
+ /* send stop command to stop the channels */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
+ ret = gpi_stop_chan(&gpii->gchan[i]);
+ if (ret) {
+ mutex_unlock(&gpii->ctrl_lock);
+ return ret;
+ }
+ }
+
+ disable_irq(gpii->irq);
+
+ /* Wait for threads to complete out */
+ tasklet_kill(&gpii->ev_task);
+
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = PAUSE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+ mutex_unlock(&gpii->ctrl_lock);
+
+ return 0;
+}
+
+/* resume dma transfer */
+static int gpi_resume(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ int i, ret;
+
+ mutex_lock(&gpii->ctrl_lock);
+ if (gpii->pm_state == ACTIVE_STATE) {
+ dev_dbg(gpii->gpi_dev->dev, "channel is already active\n");
+ mutex_unlock(&gpii->ctrl_lock);
+ return 0;
+ }
+
+ enable_irq(gpii->irq);
+
+ /* send start command to start the channels */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
+ ret = gpi_send_cmd(gpii, &gpii->gchan[i], GPI_CH_CMD_START);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error starting chan, ret:%d\n", ret);
+ mutex_unlock(&gpii->ctrl_lock);
+ return ret;
+ }
+ }
+
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = ACTIVE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+ mutex_unlock(&gpii->ctrl_lock);
+
+ return 0;
+}
+
+static void gpi_desc_free(struct virt_dma_desc *vd)
+{
+ struct gpi_desc *gpi_desc = to_gpi_desc(vd);
+
+ kfree(gpi_desc);
+ gpi_desc = NULL;
+}
+
+static int
+gpi_peripheral_config(struct dma_chan *chan, struct dma_slave_config *config)
+{
+ struct gchan *gchan = to_gchan(chan);
+
+ if (!config->peripheral_config)
+ return -EINVAL;
+
+ gchan->config = krealloc(gchan->config, config->peripheral_size, GFP_NOWAIT);
+ if (!gchan->config)
+ return -ENOMEM;
+
+ memcpy(gchan->config, config->peripheral_config, config->peripheral_size);
+
+ return 0;
+}
+
+static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc,
+ struct scatterlist *sgl, enum dma_transfer_direction direction)
+{
+ struct gpi_i2c_config *i2c = chan->config;
+ struct device *dev = chan->gpii->gpi_dev->dev;
+ unsigned int tre_idx = 0;
+ dma_addr_t address;
+ struct gpi_tre *tre;
+ unsigned int i;
+
+ /* first create config tre if applicable */
+ if (i2c->set_config) {
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ tre->dword[0] = u32_encode_bits(i2c->low_count, TRE_I2C_C0_TLOW);
+ tre->dword[0] |= u32_encode_bits(i2c->high_count, TRE_I2C_C0_THIGH);
+ tre->dword[0] |= u32_encode_bits(i2c->cycle_count, TRE_I2C_C0_TCYL);
+ tre->dword[0] |= u32_encode_bits(i2c->pack_enable, TRE_I2C_C0_TX_PACK);
+ tre->dword[0] |= u32_encode_bits(i2c->pack_enable, TRE_I2C_C0_RX_PACK);
+
+ tre->dword[1] = 0;
+
+ tre->dword[2] = u32_encode_bits(i2c->clk_div, TRE_C0_CLK_DIV);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_CONFIG0, TRE_FLAGS_TYPE);
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
+ }
+
+ /* create the GO tre for Tx */
+ if (i2c->op == I2C_WRITE) {
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ if (i2c->multi_msg)
+ tre->dword[0] = u32_encode_bits(I2C_READ, TRE_I2C_GO_CMD);
+ else
+ tre->dword[0] = u32_encode_bits(i2c->op, TRE_I2C_GO_CMD);
+
+ tre->dword[0] |= u32_encode_bits(i2c->addr, TRE_I2C_GO_ADDR);
+ tre->dword[0] |= u32_encode_bits(i2c->stretch, TRE_I2C_GO_STRETCH);
+
+ tre->dword[1] = 0;
+ tre->dword[2] = u32_encode_bits(i2c->rx_len, TRE_RX_LEN);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
+
+ if (i2c->multi_msg)
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
+ else
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
+ }
+
+ if (i2c->op == I2C_READ || i2c->multi_msg == false) {
+ /* create the DMA TRE */
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ address = sg_dma_address(sgl);
+ tre->dword[0] = lower_32_bits(address);
+ tre->dword[1] = upper_32_bits(address);
+
+ tre->dword[2] = u32_encode_bits(sg_dma_len(sgl), TRE_DMA_LEN);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE);
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT);
+ };
+
+ for (i = 0; i < tre_idx; i++)
+ dev_dbg(dev, "TRE:%d %x:%x:%x:%x\n", i, desc->tre[i].dword[0],
+ desc->tre[i].dword[1], desc->tre[i].dword[2], desc->tre[i].dword[3]);
+
+ return tre_idx;
+}
+
+static int gpi_create_spi_tre(struct gchan *chan, struct gpi_desc *desc,
+ struct scatterlist *sgl, enum dma_transfer_direction direction)
+{
+ struct gpi_spi_config *spi = chan->config;
+ struct device *dev = chan->gpii->gpi_dev->dev;
+ unsigned int tre_idx = 0;
+ dma_addr_t address;
+ struct gpi_tre *tre;
+ unsigned int i;
+
+ /* first create config tre if applicable */
+ if (direction == DMA_MEM_TO_DEV && spi->set_config) {
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ tre->dword[0] = u32_encode_bits(spi->word_len, TRE_SPI_C0_WORD_SZ);
+ tre->dword[0] |= u32_encode_bits(spi->loopback_en, TRE_SPI_C0_LOOPBACK);
+ tre->dword[0] |= u32_encode_bits(spi->clock_pol_high, TRE_SPI_C0_CPOL);
+ tre->dword[0] |= u32_encode_bits(spi->data_pol_high, TRE_SPI_C0_CPHA);
+ tre->dword[0] |= u32_encode_bits(spi->pack_en, TRE_SPI_C0_TX_PACK);
+ tre->dword[0] |= u32_encode_bits(spi->pack_en, TRE_SPI_C0_RX_PACK);
+
+ tre->dword[1] = 0;
+
+ tre->dword[2] = u32_encode_bits(spi->clk_div, TRE_C0_CLK_DIV);
+ tre->dword[2] |= u32_encode_bits(spi->clk_src, TRE_C0_CLK_SRC);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_CONFIG0, TRE_FLAGS_TYPE);
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
+ }
+
+ /* create the GO tre for Tx */
+ if (direction == DMA_MEM_TO_DEV) {
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ tre->dword[0] = u32_encode_bits(spi->fragmentation, TRE_SPI_GO_FRAG);
+ tre->dword[0] |= u32_encode_bits(spi->cs, TRE_SPI_GO_CS);
+ tre->dword[0] |= u32_encode_bits(spi->cmd, TRE_SPI_GO_CMD);
+
+ tre->dword[1] = 0;
+
+ tre->dword[2] = u32_encode_bits(spi->rx_len, TRE_RX_LEN);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
+ if (spi->cmd == SPI_RX)
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOB);
+ else
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
+ }
+
+ /* create the dma tre */
+ tre = &desc->tre[tre_idx];
+ tre_idx++;
+
+ address = sg_dma_address(sgl);
+ tre->dword[0] = lower_32_bits(address);
+ tre->dword[1] = upper_32_bits(address);
+
+ tre->dword[2] = u32_encode_bits(sg_dma_len(sgl), TRE_DMA_LEN);
+
+ tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE);
+ if (direction == DMA_MEM_TO_DEV)
+ tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT);
+
+ for (i = 0; i < tre_idx; i++)
+ dev_dbg(dev, "TRE:%d %x:%x:%x:%x\n", i, desc->tre[i].dword[0],
+ desc->tre[i].dword[1], desc->tre[i].dword[2], desc->tre[i].dword[3]);
+
+ return tre_idx;
+}
+
+/* copy tre into transfer ring */
+static struct dma_async_tx_descriptor *
+gpi_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ struct device *dev = gpii->gpi_dev->dev;
+ struct gpi_ring *ch_ring = &gchan->ch_ring;
+ struct gpi_desc *gpi_desc;
+ u32 nr, nr_tre = 0;
+ u8 set_config;
+ int i;
+
+ gpii->ieob_set = false;
+ if (!is_slave_direction(direction)) {
+ dev_err(gpii->gpi_dev->dev, "invalid dma direction: %d\n", direction);
+ return NULL;
+ }
+
+ if (sg_len > 1) {
+ dev_err(dev, "Multi sg sent, we support only one atm: %d\n", sg_len);
+ return NULL;
+ }
+
+ nr_tre = 3;
+ set_config = *(u32 *)gchan->config;
+ if (!set_config)
+ nr_tre = 2;
+ if (direction == DMA_DEV_TO_MEM) /* rx */
+ nr_tre = 1;
+
+ /* calculate # of elements required & available */
+ nr = gpi_ring_num_elements_avail(ch_ring);
+ if (nr < nr_tre) {
+ dev_err(dev, "not enough space in ring, avail:%u required:%u\n", nr, nr_tre);
+ return NULL;
+ }
+
+ gpi_desc = kzalloc(sizeof(*gpi_desc), GFP_NOWAIT);
+ if (!gpi_desc)
+ return NULL;
+
+ /* create TREs for xfer */
+ if (gchan->protocol == QCOM_GPI_SPI) {
+ i = gpi_create_spi_tre(gchan, gpi_desc, sgl, direction);
+ } else if (gchan->protocol == QCOM_GPI_I2C) {
+ i = gpi_create_i2c_tre(gchan, gpi_desc, sgl, direction);
+ } else {
+ dev_err(dev, "invalid peripheral: %d\n", gchan->protocol);
+ kfree(gpi_desc);
+ return NULL;
+ }
+
+ /* set up the descriptor */
+ gpi_desc->gchan = gchan;
+ gpi_desc->len = sg_dma_len(sgl);
+ gpi_desc->num_tre = i;
+
+ return vchan_tx_prep(&gchan->vc, &gpi_desc->vd, flags);
+}
+
+/* rings transfer ring db to being transfer */
+static void gpi_issue_pending(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ unsigned long flags, pm_lock_flags;
+ struct virt_dma_desc *vd = NULL;
+ struct gpi_desc *gpi_desc;
+ struct gpi_ring *ch_ring = &gchan->ch_ring;
+ void *tre, *wp = NULL;
+ int i;
+
+ read_lock_irqsave(&gpii->pm_lock, pm_lock_flags);
+
+ /* move all submitted discriptors to issued list */
+ spin_lock_irqsave(&gchan->vc.lock, flags);
+ if (vchan_issue_pending(&gchan->vc))
+ vd = list_last_entry(&gchan->vc.desc_issued,
+ struct virt_dma_desc, node);
+ spin_unlock_irqrestore(&gchan->vc.lock, flags);
+
+ /* nothing to do list is empty */
+ if (!vd) {
+ read_unlock_irqrestore(&gpii->pm_lock, pm_lock_flags);
+ return;
+ }
+
+ gpi_desc = to_gpi_desc(vd);
+ for (i = 0; i < gpi_desc->num_tre; i++) {
+ tre = &gpi_desc->tre[i];
+ gpi_queue_xfer(gpii, gchan, tre, &wp);
+ }
+
+ gpi_desc->db = ch_ring->wp;
+ gpi_write_ch_db(gchan, &gchan->ch_ring, gpi_desc->db);
+ read_unlock_irqrestore(&gpii->pm_lock, pm_lock_flags);
+}
+
+static int gpi_ch_init(struct gchan *gchan)
+{
+ struct gpii *gpii = gchan->gpii;
+ const int ev_factor = gpii->gpi_dev->ev_factor;
+ u32 elements;
+ int i = 0, ret = 0;
+
+ gchan->pm_state = CONFIG_STATE;
+
+ /* check if both channels are configured before continue */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++)
+ if (gpii->gchan[i].pm_state != CONFIG_STATE)
+ goto exit_gpi_init;
+
+ /* protocol must be same for both channels */
+ if (gpii->gchan[0].protocol != gpii->gchan[1].protocol) {
+ dev_err(gpii->gpi_dev->dev, "protocol did not match protocol %u != %u\n",
+ gpii->gchan[0].protocol, gpii->gchan[1].protocol);
+ ret = -EINVAL;
+ goto exit_gpi_init;
+ }
+
+ /* allocate memory for event ring */
+ elements = CHAN_TRES << ev_factor;
+ ret = gpi_alloc_ring(&gpii->ev_ring, elements,
+ sizeof(union gpi_event), gpii);
+ if (ret)
+ goto exit_gpi_init;
+
+ /* configure interrupts */
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = PREPARE_HARDWARE;
+ write_unlock_irq(&gpii->pm_lock);
+ ret = gpi_config_interrupts(gpii, DEFAULT_IRQ_SETTINGS, 0);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "error config. interrupts, ret:%d\n", ret);
+ goto error_config_int;
+ }
+
+ /* allocate event rings */
+ ret = gpi_alloc_ev_chan(gpii);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "error alloc_ev_chan:%d\n", ret);
+ goto error_alloc_ev_ring;
+ }
+
+ /* Allocate all channels */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
+ ret = gpi_alloc_chan(&gpii->gchan[i], true);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error allocating chan:%d\n", ret);
+ goto error_alloc_chan;
+ }
+ }
+
+ /* start channels */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
+ ret = gpi_start_chan(&gpii->gchan[i]);
+ if (ret) {
+ dev_err(gpii->gpi_dev->dev, "Error start chan:%d\n", ret);
+ goto error_start_chan;
+ }
+ }
+ return ret;
+
+error_start_chan:
+ for (i = i - 1; i >= 0; i++) {
+ gpi_stop_chan(&gpii->gchan[i]);
+ gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
+ }
+ i = 2;
+error_alloc_chan:
+ for (i = i - 1; i >= 0; i--)
+ gpi_reset_chan(gchan, GPI_CH_CMD_DE_ALLOC);
+error_alloc_ev_ring:
+ gpi_disable_interrupts(gpii);
+error_config_int:
+ gpi_free_ring(&gpii->ev_ring, gpii);
+exit_gpi_init:
+ mutex_unlock(&gpii->ctrl_lock);
+ return ret;
+}
+
+/* release all channel resources */
+static void gpi_free_chan_resources(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ enum gpi_pm_state cur_state;
+ int ret, i;
+
+ mutex_lock(&gpii->ctrl_lock);
+
+ cur_state = gchan->pm_state;
+
+ /* disable ch state so no more TRE processing for this channel */
+ write_lock_irq(&gpii->pm_lock);
+ gchan->pm_state = PREPARE_TERMINATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+ /* attempt to do graceful hardware shutdown */
+ if (cur_state == ACTIVE_STATE) {
+ gpi_stop_chan(gchan);
+
+ ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
+ if (ret)
+ dev_err(gpii->gpi_dev->dev, "error resetting channel:%d\n", ret);
+
+ gpi_reset_chan(gchan, GPI_CH_CMD_DE_ALLOC);
+ }
+
+ /* free all allocated memory */
+ gpi_free_ring(&gchan->ch_ring, gpii);
+ vchan_free_chan_resources(&gchan->vc);
+ kfree(gchan->config);
+
+ write_lock_irq(&gpii->pm_lock);
+ gchan->pm_state = DISABLE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+ /* if other rings are still active exit */
+ for (i = 0; i < MAX_CHANNELS_PER_GPII; i++)
+ if (gpii->gchan[i].ch_ring.configured)
+ goto exit_free;
+
+ /* deallocate EV Ring */
+ cur_state = gpii->pm_state;
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = PREPARE_TERMINATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+ /* wait for threads to complete out */
+ tasklet_kill(&gpii->ev_task);
+
+ /* send command to de allocate event ring */
+ if (cur_state == ACTIVE_STATE)
+ gpi_send_cmd(gpii, NULL, GPI_EV_CMD_DEALLOC);
+
+ gpi_free_ring(&gpii->ev_ring, gpii);
+
+ /* disable interrupts */
+ if (cur_state == ACTIVE_STATE)
+ gpi_disable_interrupts(gpii);
+
+ /* set final state to disable */
+ write_lock_irq(&gpii->pm_lock);
+ gpii->pm_state = DISABLE_STATE;
+ write_unlock_irq(&gpii->pm_lock);
+
+exit_free:
+ mutex_unlock(&gpii->ctrl_lock);
+}
+
+/* allocate channel resources */
+static int gpi_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct gchan *gchan = to_gchan(chan);
+ struct gpii *gpii = gchan->gpii;
+ int ret;
+
+ mutex_lock(&gpii->ctrl_lock);
+
+ /* allocate memory for transfer ring */
+ ret = gpi_alloc_ring(&gchan->ch_ring, CHAN_TRES,
+ sizeof(struct gpi_tre), gpii);
+ if (ret)
+ goto xfer_alloc_err;
+
+ ret = gpi_ch_init(gchan);
+
+ mutex_unlock(&gpii->ctrl_lock);
+
+ return ret;
+xfer_alloc_err:
+ mutex_unlock(&gpii->ctrl_lock);
+
+ return ret;
+}
+
+static int gpi_find_avail_gpii(struct gpi_dev *gpi_dev, u32 seid)
+{
+ struct gchan *tx_chan, *rx_chan;
+ unsigned int gpii;
+
+ /* check if same seid is already configured for another chid */
+ for (gpii = 0; gpii < gpi_dev->max_gpii; gpii++) {
+ if (!((1 << gpii) & gpi_dev->gpii_mask))
+ continue;
+
+ tx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_TX_CHAN];
+ rx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_RX_CHAN];
+
+ if (rx_chan->vc.chan.client_count && rx_chan->seid == seid)
+ return gpii;
+ if (tx_chan->vc.chan.client_count && tx_chan->seid == seid)
+ return gpii;
+ }
+
+ /* no channels configured with same seid, return next avail gpii */
+ for (gpii = 0; gpii < gpi_dev->max_gpii; gpii++) {
+ if (!((1 << gpii) & gpi_dev->gpii_mask))
+ continue;
+
+ tx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_TX_CHAN];
+ rx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_RX_CHAN];
+
+ /* check if gpii is configured */
+ if (tx_chan->vc.chan.client_count ||
+ rx_chan->vc.chan.client_count)
+ continue;
+
+ /* found a free gpii */
+ return gpii;
+ }
+
+ /* no gpii instance available to use */
+ return -EIO;
+}
+
+/* gpi_of_dma_xlate: open client requested channel */
+static struct dma_chan *gpi_of_dma_xlate(struct of_phandle_args *args,
+ struct of_dma *of_dma)
+{
+ struct gpi_dev *gpi_dev = (struct gpi_dev *)of_dma->of_dma_data;
+ u32 seid, chid;
+ int gpii;
+ struct gchan *gchan;
+
+ if (args->args_count < 3) {
+ dev_err(gpi_dev->dev, "gpii require minimum 2 args, client passed:%d args\n",
+ args->args_count);
+ return NULL;
+ }
+
+ chid = args->args[0];
+ if (chid >= MAX_CHANNELS_PER_GPII) {
+ dev_err(gpi_dev->dev, "gpii channel:%d not valid\n", chid);
+ return NULL;
+ }
+
+ seid = args->args[1];
+
+ /* find next available gpii to use */
+ gpii = gpi_find_avail_gpii(gpi_dev, seid);
+ if (gpii < 0) {
+ dev_err(gpi_dev->dev, "no available gpii instances\n");
+ return NULL;
+ }
+
+ gchan = &gpi_dev->gpiis[gpii].gchan[chid];
+ if (gchan->vc.chan.client_count) {
+ dev_err(gpi_dev->dev, "gpii:%d chid:%d seid:%d already configured\n",
+ gpii, chid, gchan->seid);
+ return NULL;
+ }
+
+ gchan->seid = seid;
+ gchan->protocol = args->args[2];
+
+ return dma_get_slave_channel(&gchan->vc.chan);
+}
+
+static int gpi_probe(struct platform_device *pdev)
+{
+ struct gpi_dev *gpi_dev;
+ unsigned int i;
+ int ret;
+
+ gpi_dev = devm_kzalloc(&pdev->dev, sizeof(*gpi_dev), GFP_KERNEL);
+ if (!gpi_dev)
+ return -ENOMEM;
+
+ gpi_dev->dev = &pdev->dev;
+ gpi_dev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ gpi_dev->regs = devm_ioremap_resource(gpi_dev->dev, gpi_dev->res);
+ if (IS_ERR(gpi_dev->regs))
+ return PTR_ERR(gpi_dev->regs);
+ gpi_dev->ee_base = gpi_dev->regs;
+
+ ret = of_property_read_u32(gpi_dev->dev->of_node, "dma-channels",
+ &gpi_dev->max_gpii);
+ if (ret) {
+ dev_err(gpi_dev->dev, "missing 'max-no-gpii' DT node\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(gpi_dev->dev->of_node, "dma-channel-mask",
+ &gpi_dev->gpii_mask);
+ if (ret) {
+ dev_err(gpi_dev->dev, "missing 'gpii-mask' DT node\n");
+ return ret;
+ }
+
+ gpi_dev->ev_factor = EV_FACTOR;
+
+ ret = dma_set_mask(gpi_dev->dev, DMA_BIT_MASK(64));
+ if (ret) {
+ dev_err(gpi_dev->dev, "Error setting dma_mask to 64, ret:%d\n", ret);
+ return ret;
+ }
+
+ gpi_dev->gpiis = devm_kzalloc(gpi_dev->dev, sizeof(*gpi_dev->gpiis) *
+ gpi_dev->max_gpii, GFP_KERNEL);
+ if (!gpi_dev->gpiis)
+ return -ENOMEM;
+
+ /* setup all the supported gpii */
+ INIT_LIST_HEAD(&gpi_dev->dma_device.channels);
+ for (i = 0; i < gpi_dev->max_gpii; i++) {
+ struct gpii *gpii = &gpi_dev->gpiis[i];
+ int chan;
+
+ if (!((1 << i) & gpi_dev->gpii_mask))
+ continue;
+
+ /* set up ev cntxt register map */
+ gpii->ev_cntxt_base_reg = gpi_dev->ee_base + GPII_n_EV_CH_k_CNTXT_0_OFFS(i, 0);
+ gpii->ev_cntxt_db_reg = gpi_dev->ee_base + GPII_n_EV_CH_k_DOORBELL_0_OFFS(i, 0);
+ gpii->ev_ring_rp_lsb_reg = gpii->ev_cntxt_base_reg + CNTXT_4_RING_RP_LSB;
+ gpii->ev_cmd_reg = gpi_dev->ee_base + GPII_n_EV_CH_CMD_OFFS(i);
+ gpii->ieob_clr_reg = gpi_dev->ee_base + GPII_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(i);
+
+ /* set up irq */
+ ret = platform_get_irq(pdev, i);
+ if (ret < 0) {
+ dev_err(gpi_dev->dev, "platform_get_irq failed for %d:%d\n", i, ret);
+ return ret;
+ }
+ gpii->irq = ret;
+
+ /* set up channel specific register info */
+ for (chan = 0; chan < MAX_CHANNELS_PER_GPII; chan++) {
+ struct gchan *gchan = &gpii->gchan[chan];
+
+ /* set up ch cntxt register map */
+ gchan->ch_cntxt_base_reg = gpi_dev->ee_base +
+ GPII_n_CH_k_CNTXT_0_OFFS(i, chan);
+ gchan->ch_cntxt_db_reg = gpi_dev->ee_base +
+ GPII_n_CH_k_DOORBELL_0_OFFS(i, chan);
+ gchan->ch_cmd_reg = gpi_dev->ee_base + GPII_n_CH_CMD_OFFS(i);
+
+ /* vchan setup */
+ vchan_init(&gchan->vc, &gpi_dev->dma_device);
+ gchan->vc.desc_free = gpi_desc_free;
+ gchan->chid = chan;
+ gchan->gpii = gpii;
+ gchan->dir = GPII_CHAN_DIR[chan];
+ }
+ mutex_init(&gpii->ctrl_lock);
+ rwlock_init(&gpii->pm_lock);
+ tasklet_init(&gpii->ev_task, gpi_ev_tasklet,
+ (unsigned long)gpii);
+ init_completion(&gpii->cmd_completion);
+ gpii->gpii_id = i;
+ gpii->regs = gpi_dev->ee_base;
+ gpii->gpi_dev = gpi_dev;
+ }
+
+ platform_set_drvdata(pdev, gpi_dev);
+
+ /* clear and Set capabilities */
+ dma_cap_zero(gpi_dev->dma_device.cap_mask);
+ dma_cap_set(DMA_SLAVE, gpi_dev->dma_device.cap_mask);
+
+ /* configure dmaengine apis */
+ gpi_dev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ gpi_dev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
+ gpi_dev->dma_device.src_addr_widths = DMA_SLAVE_BUSWIDTH_8_BYTES;
+ gpi_dev->dma_device.dst_addr_widths = DMA_SLAVE_BUSWIDTH_8_BYTES;
+ gpi_dev->dma_device.device_alloc_chan_resources = gpi_alloc_chan_resources;
+ gpi_dev->dma_device.device_free_chan_resources = gpi_free_chan_resources;
+ gpi_dev->dma_device.device_tx_status = dma_cookie_status;
+ gpi_dev->dma_device.device_issue_pending = gpi_issue_pending;
+ gpi_dev->dma_device.device_prep_slave_sg = gpi_prep_slave_sg;
+ gpi_dev->dma_device.device_config = gpi_peripheral_config;
+ gpi_dev->dma_device.device_terminate_all = gpi_terminate_all;
+ gpi_dev->dma_device.dev = gpi_dev->dev;
+ gpi_dev->dma_device.device_pause = gpi_pause;
+ gpi_dev->dma_device.device_resume = gpi_resume;
+
+ /* register with dmaengine framework */
+ ret = dma_async_device_register(&gpi_dev->dma_device);
+ if (ret) {
+ dev_err(gpi_dev->dev, "async_device_register failed ret:%d", ret);
+ return ret;
+ }
+
+ ret = of_dma_controller_register(gpi_dev->dev->of_node,
+ gpi_of_dma_xlate, gpi_dev);
+ if (ret) {
+ dev_err(gpi_dev->dev, "of_dma_controller_reg failed ret:%d", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct of_device_id gpi_of_match[] = {
+ { .compatible = "qcom,sdm845-gpi-dma" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, gpi_of_match);
+
+static struct platform_driver gpi_driver = {
+ .probe = gpi_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = gpi_of_match,
+ },
+};
+
+static int __init gpi_init(void)
+{
+ return platform_driver_register(&gpi_driver);
+}
+subsys_initcall(gpi_init)
+
+MODULE_DESCRIPTION("QCOM GPI DMA engine driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/dma/qcom-gpi-dma.h b/include/linux/dma/qcom-gpi-dma.h
new file mode 100644
index 000000000000..f46dc3372f11
--- /dev/null
+++ b/include/linux/dma/qcom-gpi-dma.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#ifndef QCOM_GPI_DMA_H
+#define QCOM_GPI_DMA_H
+
+/**
+ * enum spi_transfer_cmd - spi transfer commands
+ */
+enum spi_transfer_cmd {
+ SPI_TX = 1,
+ SPI_RX,
+ SPI_DUPLEX,
+};
+
+/**
+ * struct gpi_spi_config - spi config for peripheral
+ *
+ * @loopback_en: spi loopback enable when set
+ * @clock_pol_high: clock polarity
+ * @data_pol_high: data polarity
+ * @pack_en: process tx/rx buffers as packed
+ * @word_len: spi word length
+ * @clk_div: source clock divider
+ * @clk_src: serial clock
+ * @cmd: spi cmd
+ * @fragmentation: keep CS assserted at end of sequence
+ * @cs: chip select toggle
+ * @set_config: set peripheral config
+ * @rx_len: receive length for buffer
+ */
+struct gpi_spi_config {
+ u8 set_config;
+ u8 loopback_en;
+ u8 clock_pol_high;
+ u8 data_pol_high;
+ u8 pack_en;
+ u8 word_len;
+ u8 fragmentation;
+ u8 cs;
+ u32 clk_div;
+ u32 clk_src;
+ enum spi_transfer_cmd cmd;
+ u32 rx_len;
+};
+
+enum i2c_op {
+ I2C_WRITE = 1,
+ I2C_READ,
+};
+
+/**
+ * struct gpi_i2c_config - i2c config for peripheral
+ *
+ * @pack_enable: process tx/rx buffers as packed
+ * @cycle_count: clock cycles to be sent
+ * @high_count: high period of clock
+ * @low_count: low period of clock
+ * @clk_div: source clock divider
+ * @addr: i2c bus address
+ * @stretch: stretch the clock at eot
+ * @set_config: set peripheral config
+ * @rx_len: receive length for buffer
+ * @op: i2c cmd
+ * @muli-msg: is part of multi i2c r-w msgs
+ */
+struct gpi_i2c_config {
+ u8 set_config;
+ u8 pack_enable;
+ u8 cycle_count;
+ u8 high_count;
+ u8 low_count;
+ u8 addr;
+ u8 stretch;
+ u16 clk_div;
+ u32 rx_len;
+ enum i2c_op op;
+ bool multi_msg;
+};
+
+#endif /* QCOM_GPI_DMA_H */
--
2.26.2