[RFC net-next 2/3] net: marvell: prestera: Add PCI interface support
From: Vadym Kochan
Date: Tue Feb 25 2020 - 11:31:12 EST
Add PCI interface driver for Prestera Switch ASICs family devices, which
provides:
- Firmware loading mechanism
- Requests & events handling to/from the firmware
- Access to the firmware on the bus level
The firmware has to be loaded each time device is reset. The driver is
loading it from:
/lib/firmware/marvell/prestera_fw_img.bin
The firmware image version is located within internal header and consists
of 3 numbers - MAJOR.MINOR.PATCH. Additionally, driver has hard-coded
minimum supported firmware version which it can work with:
MAJOR - reflects the support on ABI level between driver and loaded
firmware, this number should be the same for driver and loaded
firmware.
MINOR - this is the minimal supported version between driver and the
firmware.
PATCH - indicates only fixes, firmware ABI is not changed.
Signed-off-by: Vadym Kochan <vadym.kochan@xxxxxxxxxxx>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/prestera/Kconfig | 11 +
.../net/ethernet/marvell/prestera/Makefile | 2 +
.../ethernet/marvell/prestera/prestera_pci.c | 840 ++++++++++++++++++
3 files changed, 853 insertions(+)
create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_pci.c
diff --git a/drivers/net/ethernet/marvell/prestera/Kconfig b/drivers/net/ethernet/marvell/prestera/Kconfig
index d0b416dcb677..a4e52f7af8dd 100644
--- a/drivers/net/ethernet/marvell/prestera/Kconfig
+++ b/drivers/net/ethernet/marvell/prestera/Kconfig
@@ -11,3 +11,14 @@ config PRESTERA
To compile this driver as a module, choose M here: the
module will be called prestera_sw.
+
+config PRESTERA_PCI
+ tristate "PCI interface driver for Marvell Prestera Switch ASICs family"
+ depends on PCI && HAS_IOMEM && PRESTERA
+ default m
+ ---help---
+ This is implementation of PCI interface support for Marvell Prestera
+ Switch ASICs family.
+
+ To compile this driver as a module, choose M here: the
+ module will be called prestera_pci.
diff --git a/drivers/net/ethernet/marvell/prestera/Makefile b/drivers/net/ethernet/marvell/prestera/Makefile
index 9446298fb7f4..5d9b579a0314 100644
--- a/drivers/net/ethernet/marvell/prestera/Makefile
+++ b/drivers/net/ethernet/marvell/prestera/Makefile
@@ -1,3 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PRESTERA) += prestera_sw.o
prestera_sw-objs := prestera.o prestera_hw.o prestera_switchdev.o
+
+obj-$(CONFIG_PRESTERA_PCI) += prestera_pci.o
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
new file mode 100644
index 000000000000..847a84e3684a
--- /dev/null
+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
@@ -0,0 +1,840 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+ *
+ * Copyright (c) 2019-2020 Marvell International Ltd. All rights reserved.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/circ_buf.h>
+#include <linux/firmware.h>
+
+#include "prestera.h"
+
+#define MVSW_FW_FILENAME "marvell/mvsw_prestera_fw.img"
+
+#define MVSW_SUPP_FW_MAJ_VER 1
+#define MVSW_SUPP_FW_MIN_VER 0
+#define MVSW_SUPP_FW_PATCH_VER 0
+
+#define mvsw_wait_timeout(cond, waitms) \
+({ \
+ unsigned long __wait_end = jiffies + msecs_to_jiffies(waitms); \
+ bool __wait_ret = false; \
+ do { \
+ if (cond) { \
+ __wait_ret = true; \
+ break; \
+ } \
+ cond_resched(); \
+ } while (time_before(jiffies, __wait_end)); \
+ __wait_ret; \
+})
+
+#define MVSW_FW_HDR_MAGIC 0x351D9D06
+#define MVSW_FW_DL_TIMEOUT 50000
+#define MVSW_FW_BLK_SZ 1024
+
+#define FW_VER_MAJ_MUL 1000000
+#define FW_VER_MIN_MUL 1000
+
+#define FW_VER_MAJ(v) ((v) / FW_VER_MAJ_MUL)
+
+#define FW_VER_MIN(v) \
+ (((v) - (FW_VER_MAJ(v) * FW_VER_MAJ_MUL)) / FW_VER_MIN_MUL)
+
+#define FW_VER_PATCH(v) \
+ (v - (FW_VER_MAJ(v) * FW_VER_MAJ_MUL) - (FW_VER_MIN(v) * FW_VER_MIN_MUL))
+
+struct mvsw_pr_fw_header {
+ __be32 magic_number;
+ __be32 version_value;
+ u8 reserved[8];
+} __packed;
+
+struct mvsw_pr_ldr_regs {
+ u32 ldr_ready;
+ u32 pad1;
+
+ u32 ldr_img_size;
+ u32 ldr_ctl_flags;
+
+ u32 ldr_buf_offs;
+ u32 ldr_buf_size;
+
+ u32 ldr_buf_rd;
+ u32 pad2;
+ u32 ldr_buf_wr;
+
+ u32 ldr_status;
+} __packed __aligned(4);
+
+#define MVSW_LDR_REG_OFFSET(f) offsetof(struct mvsw_pr_ldr_regs, f)
+
+#define MVSW_LDR_READY_MAGIC 0xf00dfeed
+
+#define MVSW_LDR_STATUS_IMG_DL BIT(0)
+#define MVSW_LDR_STATUS_START_FW BIT(1)
+#define MVSW_LDR_STATUS_INVALID_IMG BIT(2)
+#define MVSW_LDR_STATUS_NOMEM BIT(3)
+
+#define mvsw_ldr_write(fw, reg, val) \
+ writel(val, (fw)->ldr_regs + (reg))
+#define mvsw_ldr_read(fw, reg) \
+ readl((fw)->ldr_regs + (reg))
+
+/* fw loader registers */
+#define MVSW_LDR_READY_REG MVSW_LDR_REG_OFFSET(ldr_ready)
+#define MVSW_LDR_IMG_SIZE_REG MVSW_LDR_REG_OFFSET(ldr_img_size)
+#define MVSW_LDR_CTL_REG MVSW_LDR_REG_OFFSET(ldr_ctl_flags)
+#define MVSW_LDR_BUF_SIZE_REG MVSW_LDR_REG_OFFSET(ldr_buf_size)
+#define MVSW_LDR_BUF_OFFS_REG MVSW_LDR_REG_OFFSET(ldr_buf_offs)
+#define MVSW_LDR_BUF_RD_REG MVSW_LDR_REG_OFFSET(ldr_buf_rd)
+#define MVSW_LDR_BUF_WR_REG MVSW_LDR_REG_OFFSET(ldr_buf_wr)
+#define MVSW_LDR_STATUS_REG MVSW_LDR_REG_OFFSET(ldr_status)
+
+#define MVSW_LDR_CTL_DL_START BIT(0)
+
+#define MVSW_LDR_WR_IDX_MOVE(fw, n) \
+do { \
+ typeof(fw) __fw = (fw); \
+ (__fw)->ldr_wr_idx = ((__fw)->ldr_wr_idx + (n)) & \
+ ((__fw)->ldr_buf_len - 1); \
+} while (0)
+
+#define MVSW_LDR_WR_IDX_COMMIT(fw) \
+({ \
+ typeof(fw) __fw = (fw); \
+ mvsw_ldr_write((__fw), MVSW_LDR_BUF_WR_REG, \
+ (__fw)->ldr_wr_idx); \
+})
+
+#define MVSW_LDR_WR_PTR(fw) \
+({ \
+ typeof(fw) __fw = (fw); \
+ ((__fw)->ldr_ring_buf + (__fw)->ldr_wr_idx); \
+})
+
+#define MVSW_EVT_QNUM_MAX 4
+
+struct mvsw_pr_fw_evtq_regs {
+ u32 rd_idx;
+ u32 pad1;
+ u32 wr_idx;
+ u32 pad2;
+ u32 offs;
+ u32 len;
+};
+
+struct mvsw_pr_fw_regs {
+ u32 fw_ready;
+ u32 pad;
+ u32 cmd_offs;
+ u32 cmd_len;
+ u32 evt_offs;
+ u32 evt_qnum;
+
+ u32 cmd_req_ctl;
+ u32 cmd_req_len;
+ u32 cmd_rcv_ctl;
+ u32 cmd_rcv_len;
+
+ u32 fw_status;
+
+ struct mvsw_pr_fw_evtq_regs evtq_list[MVSW_EVT_QNUM_MAX];
+};
+
+#define MVSW_FW_REG_OFFSET(f) offsetof(struct mvsw_pr_fw_regs, f)
+
+#define MVSW_FW_READY_MAGIC 0xcafebabe
+
+/* fw registers */
+#define MVSW_FW_READY_REG MVSW_FW_REG_OFFSET(fw_ready)
+
+#define MVSW_CMD_BUF_OFFS_REG MVSW_FW_REG_OFFSET(cmd_offs)
+#define MVSW_CMD_BUF_LEN_REG MVSW_FW_REG_OFFSET(cmd_len)
+#define MVSW_EVT_BUF_OFFS_REG MVSW_FW_REG_OFFSET(evt_offs)
+#define MVSW_EVT_QNUM_REG MVSW_FW_REG_OFFSET(evt_qnum)
+
+#define MVSW_CMD_REQ_CTL_REG MVSW_FW_REG_OFFSET(cmd_req_ctl)
+#define MVSW_CMD_REQ_LEN_REG MVSW_FW_REG_OFFSET(cmd_req_len)
+
+#define MVSW_CMD_RCV_CTL_REG MVSW_FW_REG_OFFSET(cmd_rcv_ctl)
+#define MVSW_CMD_RCV_LEN_REG MVSW_FW_REG_OFFSET(cmd_rcv_len)
+#define MVSW_FW_STATUS_REG MVSW_FW_REG_OFFSET(fw_status)
+
+/* MVSW_CMD_REQ_CTL_REG flags */
+#define MVSW_CMD_F_REQ_SENT BIT(0)
+#define MVSW_CMD_F_REPL_RCVD BIT(1)
+
+/* MVSW_CMD_RCV_CTL_REG flags */
+#define MVSW_CMD_F_REPL_SENT BIT(0)
+
+#define MVSW_EVTQ_REG_OFFSET(q, f) \
+ (MVSW_FW_REG_OFFSET(evtq_list) + \
+ (q) * sizeof(struct mvsw_pr_fw_evtq_regs) + \
+ offsetof(struct mvsw_pr_fw_evtq_regs, f))
+
+#define MVSW_EVTQ_RD_IDX_REG(q) MVSW_EVTQ_REG_OFFSET(q, rd_idx)
+#define MVSW_EVTQ_WR_IDX_REG(q) MVSW_EVTQ_REG_OFFSET(q, wr_idx)
+#define MVSW_EVTQ_OFFS_REG(q) MVSW_EVTQ_REG_OFFSET(q, offs)
+#define MVSW_EVTQ_LEN_REG(q) MVSW_EVTQ_REG_OFFSET(q, len)
+
+#define mvsw_fw_write(fw, reg, val) writel(val, (fw)->hw_regs + (reg))
+#define mvsw_fw_read(fw, reg) readl((fw)->hw_regs + (reg))
+
+struct mvsw_pr_fw_evtq {
+ u8 __iomem *addr;
+ size_t len;
+};
+
+struct mvsw_pr_fw {
+ struct workqueue_struct *wq;
+ struct mvsw_pr_device dev;
+ struct pci_dev *pci_dev;
+ u8 __iomem *mem_addr;
+
+ u8 __iomem *ldr_regs;
+ u8 __iomem *hw_regs;
+
+ u8 __iomem *ldr_ring_buf;
+ u32 ldr_buf_len;
+ u32 ldr_wr_idx;
+
+ /* serialize access to dev->send_req */
+ struct mutex cmd_mtx;
+ size_t cmd_mbox_len;
+ u8 __iomem *cmd_mbox;
+ struct mvsw_pr_fw_evtq evt_queue[MVSW_EVT_QNUM_MAX];
+ u8 evt_qnum;
+ struct work_struct evt_work;
+ u8 __iomem *evt_buf;
+ u8 *evt_msg;
+};
+
+#define mvsw_fw_dev(fw) ((fw)->dev.dev)
+
+#define PRESTERA_DEVICE(id) PCI_VDEVICE(MARVELL, (id))
+
+static struct mvsw_pr_pci_match {
+ struct pci_driver driver;
+ const struct pci_device_id id;
+ bool registered;
+} mvsw_pci_devices[] = {
+ {
+ .driver = { .name = "AC3x 98DX326x", },
+ .id = { PRESTERA_DEVICE(0xc804), 0 },
+ },
+ {{ }, { },}
+};
+
+static int mvsw_pr_fw_load(struct mvsw_pr_fw *fw);
+
+static u32 mvsw_pr_fw_evtq_len(struct mvsw_pr_fw *fw, u8 qid)
+{
+ return fw->evt_queue[qid].len;
+}
+
+static u32 mvsw_pr_fw_evtq_avail(struct mvsw_pr_fw *fw, u8 qid)
+{
+ u32 wr_idx = mvsw_fw_read(fw, MVSW_EVTQ_WR_IDX_REG(qid));
+ u32 rd_idx = mvsw_fw_read(fw, MVSW_EVTQ_RD_IDX_REG(qid));
+
+ return CIRC_CNT(wr_idx, rd_idx, mvsw_pr_fw_evtq_len(fw, qid));
+}
+
+static void mvsw_pr_fw_evtq_rd_set(struct mvsw_pr_fw *fw,
+ u8 qid, u32 idx)
+{
+ u32 rd_idx = idx & (mvsw_pr_fw_evtq_len(fw, qid) - 1);
+
+ mvsw_fw_write(fw, MVSW_EVTQ_RD_IDX_REG(qid), rd_idx);
+}
+
+static u8 __iomem *mvsw_pr_fw_evtq_buf(struct mvsw_pr_fw *fw,
+ u8 qid)
+{
+ return fw->evt_queue[qid].addr;
+}
+
+static u32 mvsw_pr_fw_evtq_read32(struct mvsw_pr_fw *fw, u8 qid)
+{
+ u32 rd_idx = mvsw_fw_read(fw, MVSW_EVTQ_RD_IDX_REG(qid));
+ u32 val;
+
+ val = readl(mvsw_pr_fw_evtq_buf(fw, qid) + rd_idx);
+ mvsw_pr_fw_evtq_rd_set(fw, qid, rd_idx + 4);
+ return val;
+}
+
+static ssize_t mvsw_pr_fw_evtq_read_buf(struct mvsw_pr_fw *fw,
+ u8 qid, u8 *buf, size_t len)
+{
+ u32 idx = mvsw_fw_read(fw, MVSW_EVTQ_RD_IDX_REG(qid));
+ u8 __iomem *evtq_addr = mvsw_pr_fw_evtq_buf(fw, qid);
+ u32 *buf32 = (u32 *)buf;
+ int i;
+
+ for (i = 0; i < len / 4; buf32++, i++) {
+ *buf32 = readl_relaxed(evtq_addr + idx);
+ idx = (idx + 4) & (mvsw_pr_fw_evtq_len(fw, qid) - 1);
+ }
+
+ mvsw_pr_fw_evtq_rd_set(fw, qid, idx);
+
+ return i;
+}
+
+static u8 mvsw_pr_fw_evtq_pick(struct mvsw_pr_fw *fw)
+{
+ int qid;
+
+ for (qid = 0; qid < fw->evt_qnum; qid++) {
+ if (mvsw_pr_fw_evtq_avail(fw, qid) >= 4)
+ return qid;
+ }
+
+ return MVSW_EVT_QNUM_MAX;
+}
+
+static void mvsw_pr_fw_evt_work_fn(struct work_struct *work)
+{
+ struct mvsw_pr_fw *fw;
+ u8 *msg;
+ u8 qid;
+
+ fw = container_of(work, struct mvsw_pr_fw, evt_work);
+ msg = fw->evt_msg;
+
+ while ((qid = mvsw_pr_fw_evtq_pick(fw)) < MVSW_EVT_QNUM_MAX) {
+ u32 idx;
+ u32 len;
+
+ len = mvsw_pr_fw_evtq_read32(fw, qid);
+ idx = mvsw_fw_read(fw, MVSW_EVTQ_RD_IDX_REG(qid));
+
+ WARN_ON(mvsw_pr_fw_evtq_avail(fw, qid) < len);
+
+ if (WARN_ON(len > MVSW_MSG_MAX_SIZE)) {
+ mvsw_pr_fw_evtq_rd_set(fw, qid, idx + len);
+ continue;
+ }
+
+ mvsw_pr_fw_evtq_read_buf(fw, qid, msg, len);
+
+ if (fw->dev.recv_msg)
+ fw->dev.recv_msg(&fw->dev, msg, len);
+ }
+}
+
+static int mvsw_pr_fw_wait_reg32(struct mvsw_pr_fw *fw,
+ u32 reg, u32 val, unsigned int wait)
+{
+ if (mvsw_wait_timeout(mvsw_fw_read(fw, reg) == val, wait))
+ return 0;
+
+ return -EBUSY;
+}
+
+static void mvsw_pci_copy_to(u8 __iomem *dst, u8 *src, size_t len)
+{
+ u32 __iomem *dst32 = (u32 __iomem *)dst;
+ u32 *src32 = (u32 *)src;
+ int i;
+
+ for (i = 0; i < (len / 4); dst32++, src32++, i++)
+ writel_relaxed(*src32, dst32);
+}
+
+static void mvsw_pci_copy_from(u8 *dst, u8 __iomem *src, size_t len)
+{
+ u32 *dst32 = (u32 *)dst;
+ u32 __iomem *src32 = (u32 __iomem *)src;
+ int i;
+
+ for (i = 0; i < (len / 4); dst32++, src32++, i++)
+ *dst32 = readl_relaxed(src32);
+}
+
+static int mvsw_pr_fw_cmd_send(struct mvsw_pr_fw *fw,
+ u8 *in_msg, size_t in_size,
+ u8 *out_msg, size_t out_size,
+ unsigned int wait)
+{
+ u32 ret_size = 0;
+ int err = 0;
+
+ if (!wait)
+ wait = 30000;
+
+ if (ALIGN(in_size, 4) > fw->cmd_mbox_len)
+ return -EMSGSIZE;
+
+ /* wait for finish previous reply from FW */
+ err = mvsw_pr_fw_wait_reg32(fw, MVSW_CMD_RCV_CTL_REG, 0, 30);
+ if (err) {
+ dev_err(mvsw_fw_dev(fw), "finish reply from FW is timed out\n");
+ return err;
+ }
+
+ mvsw_fw_write(fw, MVSW_CMD_REQ_LEN_REG, in_size);
+ mvsw_pci_copy_to(fw->cmd_mbox, in_msg, in_size);
+
+ mvsw_fw_write(fw, MVSW_CMD_REQ_CTL_REG, MVSW_CMD_F_REQ_SENT);
+
+ /* wait for reply from FW */
+ err = mvsw_pr_fw_wait_reg32(fw, MVSW_CMD_RCV_CTL_REG, MVSW_CMD_F_REPL_SENT,
+ wait);
+ if (err) {
+ dev_err(mvsw_fw_dev(fw), "reply from FW is timed out\n");
+ goto cmd_exit;
+ }
+
+ ret_size = mvsw_fw_read(fw, MVSW_CMD_RCV_LEN_REG);
+ if (ret_size > out_size) {
+ dev_err(mvsw_fw_dev(fw), "ret_size (%u) > out_len(%zu)\n",
+ ret_size, out_size);
+ err = -EMSGSIZE;
+ goto cmd_exit;
+ }
+
+ mvsw_pci_copy_from(out_msg, fw->cmd_mbox + in_size, ret_size);
+
+cmd_exit:
+ mvsw_fw_write(fw, MVSW_CMD_REQ_CTL_REG, MVSW_CMD_F_REPL_RCVD);
+ return err;
+}
+
+static int mvsw_pr_fw_send_req(struct mvsw_pr_device *dev,
+ u8 *in_msg, size_t in_size, u8 *out_msg,
+ size_t out_size, unsigned int wait)
+{
+ struct mvsw_pr_fw *fw;
+ ssize_t ret;
+
+ fw = container_of(dev, struct mvsw_pr_fw, dev);
+
+ mutex_lock(&fw->cmd_mtx);
+ ret = mvsw_pr_fw_cmd_send(fw, in_msg, in_size, out_msg, out_size, wait);
+ mutex_unlock(&fw->cmd_mtx);
+
+ return ret;
+}
+
+static int mvsw_pr_fw_init(struct mvsw_pr_fw *fw)
+{
+ u8 __iomem *base;
+ int err;
+ u8 qid;
+
+ err = mvsw_pr_fw_load(fw);
+ if (err && err != -ETIMEDOUT)
+ return err;
+
+ err = mvsw_pr_fw_wait_reg32(fw, MVSW_FW_READY_REG,
+ MVSW_FW_READY_MAGIC, 20000);
+ if (err) {
+ dev_err(mvsw_fw_dev(fw), "FW is failed to start\n");
+ return err;
+ }
+
+ base = fw->mem_addr;
+
+ fw->cmd_mbox = base + mvsw_fw_read(fw, MVSW_CMD_BUF_OFFS_REG);
+ fw->cmd_mbox_len = mvsw_fw_read(fw, MVSW_CMD_BUF_LEN_REG);
+ mutex_init(&fw->cmd_mtx);
+
+ fw->evt_buf = base + mvsw_fw_read(fw, MVSW_EVT_BUF_OFFS_REG);
+ fw->evt_qnum = mvsw_fw_read(fw, MVSW_EVT_QNUM_REG);
+ fw->evt_msg = kmalloc(MVSW_MSG_MAX_SIZE, GFP_KERNEL);
+ if (!fw->evt_msg)
+ return -ENOMEM;
+
+ for (qid = 0; qid < fw->evt_qnum; qid++) {
+ u32 offs = mvsw_fw_read(fw, MVSW_EVTQ_OFFS_REG(qid));
+ struct mvsw_pr_fw_evtq *evtq = &fw->evt_queue[qid];
+
+ evtq->len = mvsw_fw_read(fw, MVSW_EVTQ_LEN_REG(qid));
+ evtq->addr = fw->evt_buf + offs;
+ }
+
+ return 0;
+}
+
+static void mvsw_pr_fw_uninit(struct mvsw_pr_fw *fw)
+{
+ kfree(fw->evt_msg);
+}
+
+static irqreturn_t mvsw_pci_irq_handler(int irq, void *dev_id)
+{
+ struct mvsw_pr_fw *fw = dev_id;
+
+ queue_work(fw->wq, &fw->evt_work);
+
+ return IRQ_HANDLED;
+}
+
+static int mvsw_pr_ldr_wait_reg32(struct mvsw_pr_fw *fw,
+ u32 reg, u32 val, unsigned int wait)
+{
+ if (mvsw_wait_timeout(mvsw_ldr_read(fw, reg) == val, wait))
+ return 0;
+
+ return -EBUSY;
+}
+
+static u32 mvsw_pr_ldr_buf_avail(struct mvsw_pr_fw *fw)
+{
+ u32 rd_idx = mvsw_ldr_read(fw, MVSW_LDR_BUF_RD_REG);
+
+ return CIRC_SPACE(fw->ldr_wr_idx, rd_idx, fw->ldr_buf_len);
+}
+
+static int mvsw_pr_ldr_send_buf(struct mvsw_pr_fw *fw, const u8 *buf,
+ size_t len)
+{
+ int i;
+
+ if (!mvsw_wait_timeout(mvsw_pr_ldr_buf_avail(fw) >= len, 100)) {
+ dev_err(mvsw_fw_dev(fw), "failed wait for sending firmware\n");
+ return -EBUSY;
+ }
+
+ for (i = 0; i < len; i += 4) {
+ writel_relaxed(*(u32 *)(buf + i), MVSW_LDR_WR_PTR(fw));
+ MVSW_LDR_WR_IDX_MOVE(fw, 4);
+ }
+
+ MVSW_LDR_WR_IDX_COMMIT(fw);
+ return 0;
+}
+
+static int mvsw_pr_ldr_send(struct mvsw_pr_fw *fw,
+ const char *img, u32 fw_size)
+{
+ unsigned long mask;
+ u32 status;
+ u32 pos;
+ int err;
+
+ if (mvsw_pr_ldr_wait_reg32(fw, MVSW_LDR_STATUS_REG,
+ MVSW_LDR_STATUS_IMG_DL, 1000)) {
+ dev_err(mvsw_fw_dev(fw), "Loader is not ready to load image\n");
+ return -EBUSY;
+ }
+
+ for (pos = 0; pos < fw_size; pos += MVSW_FW_BLK_SZ) {
+ if (pos + MVSW_FW_BLK_SZ > fw_size)
+ break;
+
+ err = mvsw_pr_ldr_send_buf(fw, img + pos, MVSW_FW_BLK_SZ);
+ if (err)
+ return err;
+ }
+
+ if (pos < fw_size) {
+ err = mvsw_pr_ldr_send_buf(fw, img + pos, fw_size - pos);
+ if (err)
+ return err;
+ }
+
+ /* Waiting for status IMG_DOWNLOADING to change to something else */
+ mask = ~(MVSW_LDR_STATUS_IMG_DL);
+
+ if (!mvsw_wait_timeout(mvsw_ldr_read(fw, MVSW_LDR_STATUS_REG) & mask,
+ MVSW_FW_DL_TIMEOUT)) {
+ dev_err(mvsw_fw_dev(fw), "Timeout to load FW img [state=%d]",
+ mvsw_ldr_read(fw, MVSW_LDR_STATUS_REG));
+ return -ETIMEDOUT;
+ }
+
+ status = mvsw_ldr_read(fw, MVSW_LDR_STATUS_REG);
+ if (status != MVSW_LDR_STATUS_START_FW) {
+ switch (status) {
+ case MVSW_LDR_STATUS_INVALID_IMG:
+ dev_err(mvsw_fw_dev(fw), "FW img has bad crc\n");
+ return -EINVAL;
+ case MVSW_LDR_STATUS_NOMEM:
+ dev_err(mvsw_fw_dev(fw), "Loader has no enough mem\n");
+ return -ENOMEM;
+ default:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static bool mvsw_pr_ldr_is_ready(struct mvsw_pr_fw *fw)
+{
+ return mvsw_ldr_read(fw, MVSW_LDR_READY_REG) == MVSW_LDR_READY_MAGIC;
+}
+
+static void mvsw_pr_fw_rev_parse(const struct mvsw_pr_fw_header *hdr,
+ struct mvsw_fw_rev *rev)
+{
+ u32 version = be32_to_cpu(hdr->version_value);
+
+ rev->maj = FW_VER_MAJ(version);
+ rev->min = FW_VER_MIN(version);
+ rev->sub = FW_VER_PATCH(version);
+}
+
+static int mvsw_pr_fw_rev_check(struct mvsw_pr_fw *fw)
+{
+ struct mvsw_fw_rev *rev = &fw->dev.fw_rev;
+
+ if (rev->maj == MVSW_SUPP_FW_MAJ_VER &&
+ rev->min >= MVSW_SUPP_FW_MIN_VER) {
+ return 0;
+ }
+
+ dev_err(mvsw_fw_dev(fw), "Driver supports FW version only '%u.%u.%u'",
+ MVSW_SUPP_FW_MAJ_VER,
+ MVSW_SUPP_FW_MIN_VER,
+ MVSW_SUPP_FW_PATCH_VER);
+
+ return -EINVAL;
+}
+
+static int mvsw_pr_fw_hdr_parse(struct mvsw_pr_fw *fw,
+ const struct firmware *img)
+{
+ struct mvsw_pr_fw_header *hdr = (struct mvsw_pr_fw_header *)img->data;
+ struct mvsw_fw_rev *rev = &fw->dev.fw_rev;
+ u32 magic;
+
+ magic = be32_to_cpu(hdr->magic_number);
+ if (magic != MVSW_FW_HDR_MAGIC) {
+ dev_err(mvsw_fw_dev(fw), "FW img type is invalid");
+ return -EINVAL;
+ }
+
+ mvsw_pr_fw_rev_parse(hdr, rev);
+
+ dev_info(mvsw_fw_dev(fw), "FW version '%u.%u.%u'\n",
+ rev->maj, rev->min, rev->sub);
+
+ return mvsw_pr_fw_rev_check(fw);
+}
+
+static int mvsw_pr_fw_load(struct mvsw_pr_fw *fw)
+{
+ size_t hlen = sizeof(struct mvsw_pr_fw_header);
+ const struct firmware *f;
+ bool has_ldr;
+ int err;
+
+ has_ldr = mvsw_wait_timeout(mvsw_pr_ldr_is_ready(fw), 1000);
+ if (!has_ldr) {
+ dev_err(mvsw_fw_dev(fw), "waiting for FW loader is timed out");
+ return -ETIMEDOUT;
+ }
+
+ fw->ldr_ring_buf = fw->ldr_regs +
+ mvsw_ldr_read(fw, MVSW_LDR_BUF_OFFS_REG);
+
+ fw->ldr_buf_len =
+ mvsw_ldr_read(fw, MVSW_LDR_BUF_SIZE_REG);
+
+ fw->ldr_wr_idx = 0;
+
+ err = request_firmware_direct(&f, MVSW_FW_FILENAME, &fw->pci_dev->dev);
+ if (err) {
+ dev_err(mvsw_fw_dev(fw), "failed to request firmware file\n");
+ return err;
+ }
+
+ if (!IS_ALIGNED(f->size, 4)) {
+ dev_err(mvsw_fw_dev(fw), "FW image file is not aligned");
+ release_firmware(f);
+ return -EINVAL;
+ }
+
+ err = mvsw_pr_fw_hdr_parse(fw, f);
+ if (err) {
+ dev_err(mvsw_fw_dev(fw), "FW image header is invalid\n");
+ release_firmware(f);
+ return err;
+ }
+
+ mvsw_ldr_write(fw, MVSW_LDR_IMG_SIZE_REG, f->size - hlen);
+ mvsw_ldr_write(fw, MVSW_LDR_CTL_REG, MVSW_LDR_CTL_DL_START);
+
+ dev_info(mvsw_fw_dev(fw), "Loading prestera FW image ...");
+
+ err = mvsw_pr_ldr_send(fw, f->data + hlen, f->size - hlen);
+
+ release_firmware(f);
+ return err;
+}
+
+static int mvsw_pr_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ const char *driver_name = pdev->driver->name;
+ struct mvsw_pr_fw *fw;
+ u8 __iomem *mem_addr;
+ int err;
+
+ err = pci_enable_device(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "pci_enable_device failed\n");
+ goto err_pci_enable_device;
+ }
+
+ err = pci_request_regions(pdev, driver_name);
+ if (err) {
+ dev_err(&pdev->dev, "pci_request_regions failed\n");
+ goto err_pci_request_regions;
+ }
+
+ mem_addr = pci_ioremap_bar(pdev, 2);
+ if (!mem_addr) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ err = -EIO;
+ goto err_ioremap;
+ }
+
+ pci_set_master(pdev);
+
+ fw = kzalloc(sizeof(*fw), GFP_KERNEL);
+ if (!fw) {
+ err = -ENOMEM;
+ goto err_pci_dev_alloc;
+ }
+
+ fw->pci_dev = pdev;
+ fw->dev.dev = &pdev->dev;
+ fw->dev.send_req = mvsw_pr_fw_send_req;
+ fw->mem_addr = mem_addr;
+ fw->ldr_regs = mem_addr;
+ fw->hw_regs = mem_addr;
+
+ fw->wq = alloc_workqueue("mvsw_fw_wq", WQ_HIGHPRI, 1);
+ if (!fw->wq)
+ goto err_wq_alloc;
+
+ INIT_WORK(&fw->evt_work, mvsw_pr_fw_evt_work_fn);
+
+ err = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (err < 0) {
+ dev_err(&pdev->dev, "MSI IRQ init failed\n");
+ goto err_irq_alloc;
+ }
+
+ err = request_irq(pci_irq_vector(pdev, 0), mvsw_pci_irq_handler,
+ 0, driver_name, fw);
+ if (err) {
+ dev_err(&pdev->dev, "fail to request IRQ\n");
+ goto err_request_irq;
+ }
+
+ pci_set_drvdata(pdev, fw);
+
+ err = mvsw_pr_fw_init(fw);
+ if (err)
+ goto err_mvsw_fw_init;
+
+ dev_info(mvsw_fw_dev(fw), "Prestera Switch FW is ready\n");
+
+ err = mvsw_pr_device_register(&fw->dev);
+ if (err)
+ goto err_mvsw_dev_register;
+
+ return 0;
+
+err_mvsw_dev_register:
+ mvsw_pr_fw_uninit(fw);
+err_mvsw_fw_init:
+ free_irq(pci_irq_vector(pdev, 0), fw);
+err_request_irq:
+ pci_free_irq_vectors(pdev);
+err_irq_alloc:
+ destroy_workqueue(fw->wq);
+err_wq_alloc:
+ kfree(fw);
+err_pci_dev_alloc:
+ iounmap(mem_addr);
+err_ioremap:
+ pci_release_regions(pdev);
+err_pci_request_regions:
+ pci_disable_device(pdev);
+err_pci_enable_device:
+ return err;
+}
+
+static void mvsw_pr_pci_remove(struct pci_dev *pdev)
+{
+ struct mvsw_pr_fw *fw = pci_get_drvdata(pdev);
+
+ free_irq(pci_irq_vector(pdev, 0), fw);
+ pci_free_irq_vectors(pdev);
+ mvsw_pr_device_unregister(&fw->dev);
+ flush_workqueue(fw->wq);
+ destroy_workqueue(fw->wq);
+ mvsw_pr_fw_uninit(fw);
+ iounmap(fw->mem_addr);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ kfree(fw);
+}
+
+static int __init mvsw_pr_pci_init(void)
+{
+ struct mvsw_pr_pci_match *match;
+ int err;
+
+ for (match = mvsw_pci_devices; match->driver.name; match++) {
+ match->driver.probe = mvsw_pr_pci_probe;
+ match->driver.remove = mvsw_pr_pci_remove;
+ match->driver.id_table = &match->id;
+
+ err = pci_register_driver(&match->driver);
+ if (err) {
+ pr_err("prestera_pci: failed to register %s\n",
+ match->driver.name);
+ break;
+ }
+
+ match->registered = true;
+ }
+
+ if (err) {
+ for (match = mvsw_pci_devices; match->driver.name; match++) {
+ if (!match->registered)
+ break;
+
+ pci_unregister_driver(&match->driver);
+ }
+
+ return err;
+ }
+
+ pr_info("prestera_pci: Registered Marvell Prestera PCI driver\n");
+ return 0;
+}
+
+static void __exit mvsw_pr_pci_exit(void)
+{
+ struct mvsw_pr_pci_match *match;
+
+ for (match = mvsw_pci_devices; match->driver.name; match++) {
+ if (!match->registered)
+ break;
+
+ pci_unregister_driver(&match->driver);
+ }
+
+ pr_info("prestera_pci: Unregistered Marvell Prestera PCI driver\n");
+}
+
+module_init(mvsw_pr_pci_init);
+module_exit(mvsw_pr_pci_exit);
+
+MODULE_AUTHOR("Marvell Semi.");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Marvell Prestera switch PCI interface");
--
2.17.1