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Date: Mon, 11 May 2020 13:23:46 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Vadym Kochan <vadym.kochan@...ision.eu>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
Serhiy Boiko <serhiy.boiko@...ision.eu>,
Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
Taras Chornyi <taras.chornyi@...ision.eu>,
Andrii Savka <andrii.savka@...ision.eu>,
Jiri Pirko <jiri@...lanox.com>,
Ido Schimmel <idosch@...lanox.com>,
Andrew Lunn <andrew@...n.ch>,
Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Subject: Re: [RFC next-next v2 2/5] net: marvell: prestera: Add PCI interface
support
Fri, May 01, 2020 at 01:20:49AM CEST, vadym.kochan@...ision.eu wrote:
>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-v{MAJOR}.{MINOR}.img
>
>The full 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 minimum supported version between driver and the
> firmware.
>
> PATCH - indicates only fixes, firmware ABI is not changed.
>
>Firmware image file name contains only MAJOR and MINOR numbers to make
>driver be compatible with any PATCH version.
>
>Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
>Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
>---
> drivers/net/ethernet/marvell/prestera/Kconfig | 11 +
> .../net/ethernet/marvell/prestera/Makefile | 2 +
> .../ethernet/marvell/prestera/prestera_pci.c | 829 ++++++++++++++++++
> 3 files changed, 842 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 0eddbc2e5901..087c0abae489 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 2c35c498339e..aa99b1348ac4 100644
>--- a/drivers/net/ethernet/marvell/prestera/Makefile
>+++ b/drivers/net/ethernet/marvell/prestera/Makefile
>@@ -2,3 +2,5 @@
> obj-$(CONFIG_PRESTERA) += prestera_sw.o
> prestera_sw-objs := prestera.o prestera_hw.o prestera_dsa.o \
> prestera_rxtx.o
>+
>+obj-$(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..a3b1bcd4fc73
>--- /dev/null
>+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
>@@ -0,0 +1,829 @@
>+// 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 <linux/iopoll.h>
>+
>+#include "prestera.h"
>+
>+#define PRESTERA_MSG_MAX_SIZE 1500
>+
>+#define PRESTERA_SUPP_FW_MAJ_VER 2
>+#define PRESTERA_SUPP_FW_MIN_VER 0
>+
>+#define PRESTERA_FW_PATH \
>+ "marvell/mvsw_prestera_fw-v" __stringify(PRESTERA_SUPP_FW_MAJ_VER) \
>+ "." __stringify(PRESTERA_SUPP_FW_MIN_VER) ".img"
>+
>+#define PRESTERA_FW_HDR_MAGIC 0x351D9D06
>+#define PRESTERA_FW_DL_TIMEOUT 50000
>+#define PRESTERA_FW_BLK_SZ 1024
>+
>+#define PRESTERA_FW_VER_MAJ_MUL 1000000
>+#define PRESTERA_FW_VER_MIN_MUL 1000
>+
>+#define PRESTERA_FW_VER_MAJ(v) ((v) / PRESTERA_FW_VER_MAJ_MUL)
>+
>+#define PRESTERA_FW_VER_MIN(v) \
>+ (((v) - (PRESTERA_FW_VER_MAJ(v) * PRESTERA_FW_VER_MAJ_MUL)) / \
>+ PRESTERA_FW_VER_MIN_MUL)
>+
>+#define PRESTERA_FW_VER_PATCH(v) \
>+ ((v) - (PRESTERA_FW_VER_MAJ(v) * PRESTERA_FW_VER_MAJ_MUL) - \
>+ (PRESTERA_FW_VER_MIN(v) * PRESTERA_FW_VER_MIN_MUL))
>+
>+struct prestera_fw_header {
>+ __be32 magic_number;
>+ __be32 version_value;
>+ u8 reserved[8];
>+} __packed;
>+
>+struct prestera_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 PRESTERA_LDR_REG_OFFSET(f) offsetof(struct prestera_ldr_regs, f)
>+
>+#define PRESTERA_LDR_READY_MAGIC 0xf00dfeed
>+
>+#define PRESTERA_LDR_STATUS_IMG_DL BIT(0)
>+#define PRESTERA_LDR_STATUS_START_FW BIT(1)
>+#define PRESTERA_LDR_STATUS_INVALID_IMG BIT(2)
>+#define PRESTERA_LDR_STATUS_NOMEM BIT(3)
>+
>+#define PRESTERA_LDR_REG_BASE(fw) ((fw)->ldr_regs)
>+#define PRESTERA_LDR_REG_ADDR(fw, reg) (PRESTERA_LDR_REG_BASE(fw) + (reg))
>+
>+#define prestera_ldr_write(fw, reg, val) \
>+ writel(val, PRESTERA_LDR_REG_ADDR(fw, reg))
>+#define prestera_ldr_read(fw, reg) \
>+ readl(PRESTERA_LDR_REG_ADDR(fw, reg))
>+
>+/* fw loader registers */
>+#define PRESTERA_LDR_READY_REG PRESTERA_LDR_REG_OFFSET(ldr_ready)
>+#define PRESTERA_LDR_IMG_SIZE_REG PRESTERA_LDR_REG_OFFSET(ldr_img_size)
>+#define PRESTERA_LDR_CTL_REG PRESTERA_LDR_REG_OFFSET(ldr_ctl_flags)
>+#define PRESTERA_LDR_BUF_SIZE_REG PRESTERA_LDR_REG_OFFSET(ldr_buf_size)
>+#define PRESTERA_LDR_BUF_OFFS_REG PRESTERA_LDR_REG_OFFSET(ldr_buf_offs)
>+#define PRESTERA_LDR_BUF_RD_REG PRESTERA_LDR_REG_OFFSET(ldr_buf_rd)
>+#define PRESTERA_LDR_BUF_WR_REG PRESTERA_LDR_REG_OFFSET(ldr_buf_wr)
>+#define PRESTERA_LDR_STATUS_REG PRESTERA_LDR_REG_OFFSET(ldr_status)
>+
>+#define PRESTERA_LDR_CTL_DL_START BIT(0)
>+
>+#define PRESTERA_EVT_QNUM_MAX 4
>+
>+struct prestera_fw_evtq_regs {
>+ u32 rd_idx;
>+ u32 pad1;
>+ u32 wr_idx;
>+ u32 pad2;
>+ u32 offs;
>+ u32 len;
>+};
>+
>+struct prestera_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;
>+ u32 rx_status;
>+
>+ struct prestera_fw_evtq_regs evtq_list[PRESTERA_EVT_QNUM_MAX];
>+};
>+
>+#define PRESTERA_FW_REG_OFFSET(f) offsetof(struct prestera_fw_regs, f)
>+
>+#define PRESTERA_FW_READY_MAGIC 0xcafebabe
>+
>+/* fw registers */
>+#define PRESTERA_FW_READY_REG PRESTERA_FW_REG_OFFSET(fw_ready)
>+
>+#define PRESTERA_CMD_BUF_OFFS_REG PRESTERA_FW_REG_OFFSET(cmd_offs)
>+#define PRESTERA_CMD_BUF_LEN_REG PRESTERA_FW_REG_OFFSET(cmd_len)
>+#define PRESTERA_EVT_BUF_OFFS_REG PRESTERA_FW_REG_OFFSET(evt_offs)
>+#define PRESTERA_EVT_QNUM_REG PRESTERA_FW_REG_OFFSET(evt_qnum)
>+
>+#define PRESTERA_CMD_REQ_CTL_REG PRESTERA_FW_REG_OFFSET(cmd_req_ctl)
>+#define PRESTERA_CMD_REQ_LEN_REG PRESTERA_FW_REG_OFFSET(cmd_req_len)
>+
>+#define PRESTERA_CMD_RCV_CTL_REG PRESTERA_FW_REG_OFFSET(cmd_rcv_ctl)
>+#define PRESTERA_CMD_RCV_LEN_REG PRESTERA_FW_REG_OFFSET(cmd_rcv_len)
>+#define PRESTERA_FW_STATUS_REG PRESTERA_FW_REG_OFFSET(fw_status)
>+#define PRESTERA_RX_STATUS_REG PRESTERA_FW_REG_OFFSET(rx_status)
>+
>+/* PRESTERA_CMD_REQ_CTL_REG flags */
>+#define PRESTERA_CMD_F_REQ_SENT BIT(0)
>+#define PRESTERA_CMD_F_REPL_RCVD BIT(1)
>+
>+/* PRESTERA_CMD_RCV_CTL_REG flags */
>+#define PRESTERA_CMD_F_REPL_SENT BIT(0)
>+
>+#define PRESTERA_EVTQ_REG_OFFSET(q, f) \
>+ (PRESTERA_FW_REG_OFFSET(evtq_list) + \
>+ (q) * sizeof(struct prestera_fw_evtq_regs) + \
>+ offsetof(struct prestera_fw_evtq_regs, f))
>+
>+#define PRESTERA_EVTQ_RD_IDX_REG(q) PRESTERA_EVTQ_REG_OFFSET(q, rd_idx)
>+#define PRESTERA_EVTQ_WR_IDX_REG(q) PRESTERA_EVTQ_REG_OFFSET(q, wr_idx)
>+#define PRESTERA_EVTQ_OFFS_REG(q) PRESTERA_EVTQ_REG_OFFSET(q, offs)
>+#define PRESTERA_EVTQ_LEN_REG(q) PRESTERA_EVTQ_REG_OFFSET(q, len)
>+
>+#define PRESTERA_FW_REG_BASE(fw) ((fw)->dev.ctl_regs)
>+#define PRESTERA_FW_REG_ADDR(fw, reg) PRESTERA_FW_REG_BASE(fw) + (reg)
>+
>+#define prestera_fw_write(fw, reg, val) \
>+ writel(val, PRESTERA_FW_REG_ADDR(fw, reg))
>+#define prestera_fw_read(fw, reg) \
>+ readl(PRESTERA_FW_REG_ADDR(fw, reg))
>+
>+struct prestera_fw_evtq {
>+ u8 __iomem *addr;
>+ size_t len;
>+};
>+
>+struct prestera_fw {
>+ struct workqueue_struct *wq;
>+ struct prestera_device dev;
>+ struct pci_dev *pci_dev;
>+
>+ u8 __iomem *ldr_regs;
>+
Empty lines not needed here.
>+ u8 __iomem *ldr_ring_buf;
>+ u32 ldr_buf_len;
>+ u32 ldr_wr_idx;
>+
>+ /* serialize access to dev->send_req */
You can put the comment on the same line
>+ struct mutex cmd_mtx;
>+ size_t cmd_mbox_len;
>+ u8 __iomem *cmd_mbox;
>+ struct prestera_fw_evtq evt_queue[PRESTERA_EVT_QNUM_MAX];
>+ u8 evt_qnum;
>+ struct work_struct evt_work;
>+ u8 __iomem *evt_buf;
>+ u8 *evt_msg;
>+};
>+
>+static int prestera_fw_load(struct prestera_fw *fw);
>+
>+static u32 prestera_fw_evtq_len(struct prestera_fw *fw, u8 qid)
>+{
>+ return fw->evt_queue[qid].len;
>+}
>+
>+static u32 prestera_fw_evtq_avail(struct prestera_fw *fw, u8 qid)
>+{
>+ u32 wr_idx = prestera_fw_read(fw, PRESTERA_EVTQ_WR_IDX_REG(qid));
>+ u32 rd_idx = prestera_fw_read(fw, PRESTERA_EVTQ_RD_IDX_REG(qid));
>+
>+ return CIRC_CNT(wr_idx, rd_idx, prestera_fw_evtq_len(fw, qid));
>+}
>+
>+static void prestera_fw_evtq_rd_set(struct prestera_fw *fw,
>+ u8 qid, u32 idx)
>+{
>+ u32 rd_idx = idx & (prestera_fw_evtq_len(fw, qid) - 1);
>+
>+ prestera_fw_write(fw, PRESTERA_EVTQ_RD_IDX_REG(qid), rd_idx);
>+}
>+
>+static u8 __iomem *prestera_fw_evtq_buf(struct prestera_fw *fw, u8 qid)
>+{
>+ return fw->evt_queue[qid].addr;
>+}
>+
>+static u32 prestera_fw_evtq_read32(struct prestera_fw *fw, u8 qid)
>+{
>+ u32 rd_idx = prestera_fw_read(fw, PRESTERA_EVTQ_RD_IDX_REG(qid));
>+ u32 val;
>+
>+ val = readl(prestera_fw_evtq_buf(fw, qid) + rd_idx);
>+ prestera_fw_evtq_rd_set(fw, qid, rd_idx + 4);
>+ return val;
>+}
>+
>+static ssize_t prestera_fw_evtq_read_buf(struct prestera_fw *fw,
>+ u8 qid, u8 *buf, size_t len)
>+{
>+ u32 idx = prestera_fw_read(fw, PRESTERA_EVTQ_RD_IDX_REG(qid));
>+ u8 __iomem *evtq_addr = prestera_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) & (prestera_fw_evtq_len(fw, qid) - 1);
>+ }
>+
>+ prestera_fw_evtq_rd_set(fw, qid, idx);
>+
>+ return i;
>+}
>+
>+static u8 prestera_fw_evtq_pick(struct prestera_fw *fw)
>+{
>+ int qid;
>+
>+ for (qid = 0; qid < fw->evt_qnum; qid++) {
>+ if (prestera_fw_evtq_avail(fw, qid) >= 4)
>+ return qid;
>+ }
>+
>+ return PRESTERA_EVT_QNUM_MAX;
>+}
>+
>+static void prestera_fw_evt_work_fn(struct work_struct *work)
>+{
>+ struct prestera_fw *fw;
>+ u8 *msg;
>+ u8 qid;
>+
>+ fw = container_of(work, struct prestera_fw, evt_work);
>+ msg = fw->evt_msg;
>+
>+ while ((qid = prestera_fw_evtq_pick(fw)) < PRESTERA_EVT_QNUM_MAX) {
>+ u32 idx;
>+ u32 len;
>+
>+ len = prestera_fw_evtq_read32(fw, qid);
>+ idx = prestera_fw_read(fw, PRESTERA_EVTQ_RD_IDX_REG(qid));
>+
>+ WARN_ON(prestera_fw_evtq_avail(fw, qid) < len);
>+
>+ if (WARN_ON(len > PRESTERA_MSG_MAX_SIZE)) {
>+ prestera_fw_evtq_rd_set(fw, qid, idx + len);
>+ continue;
>+ }
>+
>+ prestera_fw_evtq_read_buf(fw, qid, msg, len);
>+
>+ if (fw->dev.recv_msg)
>+ fw->dev.recv_msg(&fw->dev, msg, len);
>+ }
>+}
>+
>+static int prestera_fw_wait_reg32(struct prestera_fw *fw, u32 reg, u32 cmp,
>+ unsigned int waitms)
>+{
>+ u8 __iomem *addr = PRESTERA_FW_REG_ADDR(fw, reg);
>+ u32 val = 0;
>+
>+ return readl_poll_timeout(addr, val, cmp == val, 1000 * 10, waitms * 1000);
>+}
>+
>+static void prestera_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 prestera_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 prestera_fw_cmd_send(struct prestera_fw *fw,
>+ u8 *in_msg, size_t in_size,
>+ u8 *out_msg, size_t out_size,
>+ unsigned int waitms)
>+{
>+ u32 ret_size = 0;
>+ int err = 0;
>+
>+ if (!waitms)
>+ waitms = 30000;
>+
>+ if (ALIGN(in_size, 4) > fw->cmd_mbox_len)
>+ return -EMSGSIZE;
>+
>+ /* wait for finish previous reply from FW */
>+ err = prestera_fw_wait_reg32(fw, PRESTERA_CMD_RCV_CTL_REG, 0, 30);
>+ if (err) {
>+ dev_err(fw->dev.dev, "finish reply from FW is timed out\n");
>+ return err;
>+ }
>+
>+ prestera_fw_write(fw, PRESTERA_CMD_REQ_LEN_REG, in_size);
>+ prestera_pci_copy_to(fw->cmd_mbox, in_msg, in_size);
>+
>+ prestera_fw_write(fw, PRESTERA_CMD_REQ_CTL_REG, PRESTERA_CMD_F_REQ_SENT);
>+
>+ /* wait for reply from FW */
>+ err = prestera_fw_wait_reg32(fw, PRESTERA_CMD_RCV_CTL_REG,
>+ PRESTERA_CMD_F_REPL_SENT, waitms);
>+ if (err) {
>+ dev_err(fw->dev.dev, "reply from FW is timed out\n");
>+ goto cmd_exit;
>+ }
>+
>+ ret_size = prestera_fw_read(fw, PRESTERA_CMD_RCV_LEN_REG);
>+ if (ret_size > out_size) {
>+ dev_err(fw->dev.dev, "ret_size (%u) > out_len(%zu)\n",
>+ ret_size, out_size);
>+ err = -EMSGSIZE;
>+ goto cmd_exit;
>+ }
>+
>+ prestera_pci_copy_from(out_msg, fw->cmd_mbox + in_size, ret_size);
>+
>+cmd_exit:
>+ prestera_fw_write(fw, PRESTERA_CMD_REQ_CTL_REG, PRESTERA_CMD_F_REPL_RCVD);
>+ return err;
>+}
>+
>+static int prestera_fw_send_req(struct prestera_device *dev,
>+ u8 *in_msg, size_t in_size, u8 *out_msg,
>+ size_t out_size, unsigned int waitms)
>+{
>+ struct prestera_fw *fw;
>+ ssize_t ret;
>+
>+ fw = container_of(dev, struct prestera_fw, dev);
>+
>+ mutex_lock(&fw->cmd_mtx);
>+ ret = prestera_fw_cmd_send(fw, in_msg, in_size, out_msg, out_size, waitms);
>+ mutex_unlock(&fw->cmd_mtx);
>+
>+ return ret;
>+}
>+
>+static int prestera_fw_init(struct prestera_fw *fw)
>+{
>+ u8 __iomem *base;
>+ int err;
>+ u8 qid;
>+
>+ fw->dev.send_req = prestera_fw_send_req;
>+ fw->ldr_regs = fw->dev.ctl_regs;
>+
>+ err = prestera_fw_load(fw);
>+ if (err && err != -ETIMEDOUT)
>+ return err;
>+
>+ err = prestera_fw_wait_reg32(fw, PRESTERA_FW_READY_REG,
>+ PRESTERA_FW_READY_MAGIC, 20000);
>+ if (err) {
>+ dev_err(fw->dev.dev, "FW is failed to start\n");
>+ return err;
>+ }
>+
>+ base = fw->dev.ctl_regs;
>+
>+ fw->cmd_mbox = base + prestera_fw_read(fw, PRESTERA_CMD_BUF_OFFS_REG);
>+ fw->cmd_mbox_len = prestera_fw_read(fw, PRESTERA_CMD_BUF_LEN_REG);
>+ mutex_init(&fw->cmd_mtx);
>+
>+ fw->evt_buf = base + prestera_fw_read(fw, PRESTERA_EVT_BUF_OFFS_REG);
>+ fw->evt_qnum = prestera_fw_read(fw, PRESTERA_EVT_QNUM_REG);
>+ fw->evt_msg = kmalloc(PRESTERA_MSG_MAX_SIZE, GFP_KERNEL);
>+ if (!fw->evt_msg)
>+ return -ENOMEM;
>+
>+ for (qid = 0; qid < fw->evt_qnum; qid++) {
>+ u32 offs = prestera_fw_read(fw, PRESTERA_EVTQ_OFFS_REG(qid));
>+ struct prestera_fw_evtq *evtq = &fw->evt_queue[qid];
>+
>+ evtq->len = prestera_fw_read(fw, PRESTERA_EVTQ_LEN_REG(qid));
>+ evtq->addr = fw->evt_buf + offs;
>+ }
>+
>+ return 0;
>+}
>+
>+static void prestera_fw_uninit(struct prestera_fw *fw)
>+{
>+ kfree(fw->evt_msg);
>+}
>+
>+static irqreturn_t prestera_pci_irq_handler(int irq, void *dev_id)
>+{
>+ struct prestera_fw *fw = dev_id;
>+
>+ if (prestera_fw_read(fw, PRESTERA_RX_STATUS_REG)) {
>+ prestera_fw_write(fw, PRESTERA_RX_STATUS_REG, 0);
>+
>+ if (fw->dev.recv_pkt)
>+ fw->dev.recv_pkt(&fw->dev);
>+ }
>+
>+ queue_work(fw->wq, &fw->evt_work);
>+
>+ return IRQ_HANDLED;
>+}
>+
>+static int prestera_ldr_wait_reg32(struct prestera_fw *fw,
>+ u32 reg, u32 cmp, unsigned int waitms)
>+{
>+ u8 __iomem *addr = PRESTERA_LDR_REG_ADDR(fw, reg);
>+ u32 val = 0;
>+
>+ return readl_poll_timeout(addr, val, cmp == val, 1000 * 10, waitms * 1000);
>+}
>+
>+static u32 prestera_ldr_wait_buf(struct prestera_fw *fw, size_t len)
>+{
>+ u8 __iomem *addr = PRESTERA_LDR_REG_ADDR(fw, PRESTERA_LDR_BUF_RD_REG);
>+ u32 buf_len = fw->ldr_buf_len;
>+ u32 wr_idx = fw->ldr_wr_idx;
>+ u32 rd_idx = 0;
>+ int err;
>+
>+ err = readl_poll_timeout(addr, rd_idx,
>+ CIRC_SPACE(wr_idx, rd_idx, buf_len) >= len,
>+ 1000, 100 * 1000);
>+ if (err)
>+ return err;
>+
>+ return 0;
>+}
>+
>+static int prestera_ldr_wait_dl_finish(struct prestera_fw *fw)
>+{
>+ u8 __iomem *addr = PRESTERA_LDR_REG_ADDR(fw, PRESTERA_LDR_STATUS_REG);
>+ unsigned long mask = ~(PRESTERA_LDR_STATUS_IMG_DL);
>+ unsigned int waitus = PRESTERA_FW_DL_TIMEOUT * 1000;
reverse christmas tree.
>+ u32 val = 0;
>+ int err;
>+
>+ err = readl_poll_timeout(addr, val, val & mask, 1000 * 10, waitus);
>+ if (err) {
>+ dev_err(fw->dev.dev, "Timeout to load FW img [state=%d]",
>+ prestera_ldr_read(fw, PRESTERA_LDR_STATUS_REG));
>+ return err;
>+ }
>+
>+ return 0;
>+}
>+
>+static void prestera_ldr_wr_idx_move(struct prestera_fw *fw, unsigned int n)
>+{
>+ fw->ldr_wr_idx = (fw->ldr_wr_idx + (n)) & (fw->ldr_buf_len - 1);
>+}
>+
>+static void prestera_ldr_wr_idx_commit(struct prestera_fw *fw)
>+{
>+ prestera_ldr_write(fw, PRESTERA_LDR_BUF_WR_REG, fw->ldr_wr_idx);
>+}
>+
>+static u8 __iomem *prestera_ldr_wr_ptr(struct prestera_fw *fw)
>+{
>+ return fw->ldr_ring_buf + fw->ldr_wr_idx;
>+}
>+
>+static int prestera_ldr_send(struct prestera_fw *fw, const u8 *buf, size_t len)
>+{
>+ int err;
>+ int i;
>+
>+ err = prestera_ldr_wait_buf(fw, len);
>+ if (err) {
>+ dev_err(fw->dev.dev, "failed wait for sending firmware\n");
>+ return err;
>+ }
>+
>+ for (i = 0; i < len; i += 4) {
>+ writel_relaxed(*(u32 *)(buf + i), prestera_ldr_wr_ptr(fw));
>+ prestera_ldr_wr_idx_move(fw, 4);
>+ }
>+
>+ prestera_ldr_wr_idx_commit(fw);
>+ return 0;
>+}
>+
>+static int prestera_ldr_fw_send(struct prestera_fw *fw,
>+ const char *img, u32 fw_size)
>+{
>+ u32 status;
>+ u32 pos;
>+ int err;
>+
>+ err = prestera_ldr_wait_reg32(fw, PRESTERA_LDR_STATUS_REG,
>+ PRESTERA_LDR_STATUS_IMG_DL, 5 * 1000);
>+ if (err) {
>+ dev_err(fw->dev.dev, "Loader is not ready to load image\n");
>+ return err;
>+ }
>+
>+ for (pos = 0; pos < fw_size; pos += PRESTERA_FW_BLK_SZ) {
>+ if (pos + PRESTERA_FW_BLK_SZ > fw_size)
>+ break;
>+
>+ err = prestera_ldr_send(fw, img + pos, PRESTERA_FW_BLK_SZ);
>+ if (err)
>+ return err;
>+ }
>+
>+ if (pos < fw_size) {
>+ err = prestera_ldr_send(fw, img + pos, fw_size - pos);
>+ if (err)
>+ return err;
>+ }
>+
>+ err = prestera_ldr_wait_dl_finish(fw);
>+ if (err)
>+ return err;
>+
>+ status = prestera_ldr_read(fw, PRESTERA_LDR_STATUS_REG);
>+ if (status != PRESTERA_LDR_STATUS_START_FW) {
>+ switch (status) {
>+ case PRESTERA_LDR_STATUS_INVALID_IMG:
>+ dev_err(fw->dev.dev, "FW img has bad crc\n");
s/crc/CRC/
>+ return -EINVAL;
>+ case PRESTERA_LDR_STATUS_NOMEM:
>+ dev_err(fw->dev.dev, "Loader has no enough mem\n");
>+ return -ENOMEM;
>+ default:
>+ break;
>+ }
>+ }
>+
>+ return 0;
>+}
>+
>+static void prestera_fw_rev_parse(const struct prestera_fw_header *hdr,
>+ struct prestera_fw_rev *rev)
>+{
>+ u32 version = be32_to_cpu(hdr->version_value);
>+
>+ rev->maj = PRESTERA_FW_VER_MAJ(version);
>+ rev->min = PRESTERA_FW_VER_MIN(version);
>+ rev->sub = PRESTERA_FW_VER_PATCH(version);
>+}
>+
>+static int prestera_fw_rev_check(struct prestera_fw *fw)
>+{
>+ struct prestera_fw_rev *rev = &fw->dev.fw_rev;
>+
>+ if (rev->maj == PRESTERA_SUPP_FW_MAJ_VER &&
>+ rev->min >= PRESTERA_SUPP_FW_MIN_VER) {
>+ return 0;
>+ }
>+
>+ dev_err(fw->dev.dev, "Driver supports FW version only '%u.%u.x'",
>+ PRESTERA_SUPP_FW_MAJ_VER, PRESTERA_SUPP_FW_MIN_VER);
>+
>+ return -EINVAL;
>+}
>+
>+static int prestera_fw_hdr_parse(struct prestera_fw *fw,
>+ const struct firmware *img)
>+{
>+ struct prestera_fw_header *hdr = (struct prestera_fw_header *)img->data;
>+ struct prestera_fw_rev *rev = &fw->dev.fw_rev;
>+ u32 magic;
>+
>+ magic = be32_to_cpu(hdr->magic_number);
>+ if (magic != PRESTERA_FW_HDR_MAGIC) {
>+ dev_err(fw->dev.dev, "FW img type is invalid");
Type? Isn't it "magic"?
>+ return -EINVAL;
>+ }
>+
>+ prestera_fw_rev_parse(hdr, rev);
>+
>+ dev_info(fw->dev.dev, "FW version '%u.%u.%u'\n",
>+ rev->maj, rev->min, rev->sub);
>+
>+ return prestera_fw_rev_check(fw);
>+}
>+
>+static int prestera_fw_load(struct prestera_fw *fw)
>+{
>+ size_t hlen = sizeof(struct prestera_fw_header);
>+ const struct firmware *f;
>+ int err;
>+
>+ err = prestera_ldr_wait_reg32(fw, PRESTERA_LDR_READY_REG,
>+ PRESTERA_LDR_READY_MAGIC, 5 * 1000);
>+ if (err) {
>+ dev_err(fw->dev.dev, "waiting for FW loader is timed out");
>+ return err;
>+ }
>+
>+ fw->ldr_ring_buf = fw->ldr_regs +
>+ prestera_ldr_read(fw, PRESTERA_LDR_BUF_OFFS_REG);
>+
>+ fw->ldr_buf_len =
>+ prestera_ldr_read(fw, PRESTERA_LDR_BUF_SIZE_REG);
>+
>+ fw->ldr_wr_idx = 0;
>+
>+ err = request_firmware_direct(&f, PRESTERA_FW_PATH, &fw->pci_dev->dev);
>+ if (err) {
>+ dev_err(fw->dev.dev, "failed to request firmware file\n");
>+ return err;
>+ }
>+
>+ if (!IS_ALIGNED(f->size, 4)) {
>+ dev_err(fw->dev.dev, "FW image file is not aligned");
>+ release_firmware(f);
>+ return -EINVAL;
>+ }
>+
>+ err = prestera_fw_hdr_parse(fw, f);
>+ if (err) {
>+ dev_err(fw->dev.dev, "FW image header is invalid\n");
>+ release_firmware(f);
>+ return err;
>+ }
>+
>+ prestera_ldr_write(fw, PRESTERA_LDR_IMG_SIZE_REG, f->size - hlen);
>+ prestera_ldr_write(fw, PRESTERA_LDR_CTL_REG, PRESTERA_LDR_CTL_DL_START);
>+
>+ dev_info(fw->dev.dev, "Loading prestera FW image ...");
>+
>+ err = prestera_ldr_fw_send(fw, f->data + hlen, f->size - hlen);
>+
>+ release_firmware(f);
>+ return err;
>+}
>+
>+static int prestera_pci_probe(struct pci_dev *pdev,
>+ const struct pci_device_id *id)
>+{
>+ const char *driver_name = pdev->driver->name;
>+ struct prestera_fw *fw;
>+ u8 __iomem *ctl_addr, *pp_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;
>+ }
>+
>+ if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(30))) {
>+ dev_err(&pdev->dev, "fail to set DMA mask\n");
>+ goto err_dma_mask;
>+ }
>+
>+ ctl_addr = pci_ioremap_bar(pdev, 2);
>+ if (!ctl_addr) {
>+ dev_err(&pdev->dev, "ioremap failed\n");
>+ err = -EIO;
>+ goto err_ctl_ioremap;
>+ }
>+
>+ pp_addr = pci_ioremap_bar(pdev, 4);
>+ if (!pp_addr) {
>+ dev_err(&pdev->dev, "ioremap failed\n");
>+ err = -EIO;
>+ goto err_pp_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.ctl_regs = ctl_addr;
>+ fw->dev.pp_regs = pp_addr;
>+
>+ fw->wq = alloc_workqueue("prestera_fw_wq", WQ_HIGHPRI, 1);
>+ if (!fw->wq)
>+ goto err_wq_alloc;
>+
>+ INIT_WORK(&fw->evt_work, prestera_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), prestera_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 = prestera_fw_init(fw);
>+ if (err)
>+ goto err_prestera_fw_init;
>+
>+ dev_info(fw->dev.dev, "Switch FW is ready\n");
>+
>+ err = prestera_device_register(&fw->dev);
>+ if (err)
>+ goto err_prestera_dev_register;
>+
>+ return 0;
>+
>+err_prestera_dev_register:
>+ prestera_fw_uninit(fw);
>+err_prestera_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(pp_addr);
>+err_pp_ioremap:
>+ iounmap(ctl_addr);
>+err_ctl_ioremap:
>+err_dma_mask:
>+ pci_release_regions(pdev);
>+err_pci_request_regions:
>+ pci_disable_device(pdev);
>+err_pci_enable_device:
>+ return err;
>+}
>+
>+static void prestera_pci_remove(struct pci_dev *pdev)
>+{
>+ struct prestera_fw *fw = pci_get_drvdata(pdev);
>+
>+ free_irq(pci_irq_vector(pdev, 0), fw);
>+ pci_free_irq_vectors(pdev);
>+ prestera_device_unregister(&fw->dev);
>+ flush_workqueue(fw->wq);
>+ destroy_workqueue(fw->wq);
>+ prestera_fw_uninit(fw);
>+ iounmap(fw->dev.pp_regs);
>+ iounmap(fw->dev.ctl_regs);
>+ pci_release_regions(pdev);
>+ pci_disable_device(pdev);
>+ kfree(fw);
>+}
>+
>+static const struct pci_device_id prestera_pci_devices[] = {
>+ { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0xC804) },
>+ { }
>+};
>+MODULE_DEVICE_TABLE(pci, prestera_pci_devices);
>+
>+static struct pci_driver prestera_pci_driver = {
>+ .name = "Prestera AC3x 98DX326x",
This looks very specific. Is is related to 0xC804?
>+ .id_table = prestera_pci_devices,
>+ .probe = prestera_pci_probe,
>+ .remove = prestera_pci_remove,
>+};
>+
>+static int __init prestera_pci_init(void)
>+{
>+ return pci_register_driver(&prestera_pci_driver);
>+}
>+
>+static void __exit prestera_pci_exit(void)
>+{
>+ pci_unregister_driver(&prestera_pci_driver);
>+}
>+
>+module_init(prestera_pci_init);
>+module_exit(prestera_pci_exit);
>+
>+MODULE_AUTHOR("Marvell Semi.");
Author is you, not a company.
>+MODULE_LICENSE("Dual BSD/GPL");
>+MODULE_DESCRIPTION("Marvell Prestera switch PCI interface");
>--
>2.17.1
>
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