linux-stable/drivers/remoteproc/mtk_scp.c
Linus Torvalds abfbb29297 remoteproc updates for v5.8
This introduces device managed versions of functions used to register
 remoteproc devices, add support for remoteproc driver specific resource
 control, enables remoteproc drivers to specify ELF class and machine for
 coredumps. It integrates pm_runtime in the core for keeping resources
 active while the remote is booted and holds a wake source while
 recoverying a remote processor after a firmware crash.
 
 It refactors the remoteproc device's allocation path to simplify the
 logic, fix a few cleanup bugs and to not clone const strings onto the
 heap. Debugfs code is simplifies using the DEFINE_SHOW_ATTRIBUTE and a
 zero-length array is replaced with flexible-array.
 
 A new remoteproc driver for the JZ47xx VPU is introduced, the Qualcomm
 SM8250 gains support for audio, compute and sensor remoteprocs and the
 Qualcomm SC7180 modem support is cleaned up and improved.
 
 The Qualcomm glink subsystem-restart driver is merged into the main
 glink driver, the Qualcomm sysmon driver is extended to properly notify
 remote processors about all other remote processors' state transitions.
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Merge tag 'rproc-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

Pull remoteproc updates from Bjorn Andersson:
 "This introduces device managed versions of functions used to register
  remoteproc devices, add support for remoteproc driver specific
  resource control, enables remoteproc drivers to specify ELF class and
  machine for coredumps. It integrates pm_runtime in the core for
  keeping resources active while the remote is booted and holds a wake
  source while recoverying a remote processor after a firmware crash.

  It refactors the remoteproc device's allocation path to simplify the
  logic, fix a few cleanup bugs and to not clone const strings onto the
  heap. Debugfs code is simplifies using the DEFINE_SHOW_ATTRIBUTE and a
  zero-length array is replaced with flexible-array.

  A new remoteproc driver for the JZ47xx VPU is introduced, the Qualcomm
  SM8250 gains support for audio, compute and sensor remoteprocs and the
  Qualcomm SC7180 modem support is cleaned up and improved.

  The Qualcomm glink subsystem-restart driver is merged into the main
  glink driver, the Qualcomm sysmon driver is extended to properly
  notify remote processors about all other remote processors' state
  transitions"

* tag 'rproc-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc: (43 commits)
  remoteproc: Fix an error code in devm_rproc_alloc()
  MAINTAINERS: Add myself as reviewer for Ingenic rproc driver
  remoteproc: ingenic: Added remoteproc driver
  remoteproc: Add support for runtime PM
  dt-bindings: Document JZ47xx VPU auxiliary processor
  remoteproc: wcss: Fix arguments passed to qcom_add_glink_subdev()
  remoteproc: Fix and restore the parenting hierarchy for vdev
  remoteproc: Fall back to using parent memory pool if no dedicated available
  remoteproc: Replace zero-length array with flexible-array
  remoteproc: wcss: add support for rpmsg communication
  remoteproc: core: Prevent system suspend during remoteproc recovery
  remoteproc: qcom_q6v5_mss: Remove unused q6v5_da_to_va function
  remoteproc: qcom_q6v5_mss: map/unmap mpss segments before/after use
  remoteproc: qcom_q6v5_mss: Drop accesses to MPSS PERPH register space
  dt-bindings: remoteproc: qcom: Replace halt-nav with spare-regs
  remoteproc: qcom: pas: Add SM8250 PAS remoteprocs
  dt-bindings: remoteproc: qcom: pas: Add SM8250 remoteprocs
  remoteproc: qcom_q6v5_mss: Extract mba/mpss from memory-region
  dt-bindings: remoteproc: qcom: Use memory-region to reference memory
  remoteproc: qcom: pas: Add SC7180 Modem support
  ...
2020-06-08 13:01:08 -07:00

663 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 MediaTek Inc.
#include <asm/barrier.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/mtk_scp.h>
#include <linux/rpmsg/mtk_rpmsg.h>
#include "mtk_common.h"
#include "remoteproc_internal.h"
#define MAX_CODE_SIZE 0x500000
#define SCP_FW_END 0x7C000
/**
* scp_get() - get a reference to SCP.
*
* @pdev: the platform device of the module requesting SCP platform
* device for using SCP API.
*
* Return: Return NULL if failed. otherwise reference to SCP.
**/
struct mtk_scp *scp_get(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *scp_node;
struct platform_device *scp_pdev;
scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
if (!scp_node) {
dev_err(dev, "can't get SCP node\n");
return NULL;
}
scp_pdev = of_find_device_by_node(scp_node);
of_node_put(scp_node);
if (WARN_ON(!scp_pdev)) {
dev_err(dev, "SCP pdev failed\n");
return NULL;
}
return platform_get_drvdata(scp_pdev);
}
EXPORT_SYMBOL_GPL(scp_get);
/**
* scp_put() - "free" the SCP
*
* @scp: mtk_scp structure from scp_get().
**/
void scp_put(struct mtk_scp *scp)
{
put_device(scp->dev);
}
EXPORT_SYMBOL_GPL(scp_put);
static void scp_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
{
dev_err(scp->dev, "SCP watchdog timeout! 0x%x", scp_to_host);
rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
}
static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
{
struct mtk_scp *scp = (struct mtk_scp *)priv;
struct scp_run *run = (struct scp_run *)data;
scp->run.signaled = run->signaled;
strscpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
scp->run.dec_capability = run->dec_capability;
scp->run.enc_capability = run->enc_capability;
wake_up_interruptible(&scp->run.wq);
}
static void scp_ipi_handler(struct mtk_scp *scp)
{
struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
u8 tmp_data[SCP_SHARE_BUFFER_SIZE];
scp_ipi_handler_t handler;
u32 id = readl(&rcv_obj->id);
u32 len = readl(&rcv_obj->len);
if (len > SCP_SHARE_BUFFER_SIZE) {
dev_err(scp->dev, "ipi message too long (len %d, max %d)", len,
SCP_SHARE_BUFFER_SIZE);
return;
}
if (id >= SCP_IPI_MAX) {
dev_err(scp->dev, "No such ipi id = %d\n", id);
return;
}
scp_ipi_lock(scp, id);
handler = ipi_desc[id].handler;
if (!handler) {
dev_err(scp->dev, "No such ipi id = %d\n", id);
scp_ipi_unlock(scp, id);
return;
}
memcpy_fromio(tmp_data, &rcv_obj->share_buf, len);
handler(tmp_data, len, ipi_desc[id].priv);
scp_ipi_unlock(scp, id);
scp->ipi_id_ack[id] = true;
wake_up(&scp->ack_wq);
}
static int scp_ipi_init(struct mtk_scp *scp)
{
size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj);
size_t recv_offset = send_offset - sizeof(struct mtk_share_obj);
/* Disable SCP to host interrupt */
writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
/* shared buffer initialization */
scp->recv_buf =
(struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset);
scp->send_buf =
(struct mtk_share_obj __iomem *)(scp->sram_base + send_offset);
memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf));
memset_io(scp->send_buf, 0, sizeof(*scp->send_buf));
return 0;
}
static void scp_reset_assert(const struct mtk_scp *scp)
{
u32 val;
val = readl(scp->reg_base + MT8183_SW_RSTN);
val &= ~MT8183_SW_RSTN_BIT;
writel(val, scp->reg_base + MT8183_SW_RSTN);
}
static void scp_reset_deassert(const struct mtk_scp *scp)
{
u32 val;
val = readl(scp->reg_base + MT8183_SW_RSTN);
val |= MT8183_SW_RSTN_BIT;
writel(val, scp->reg_base + MT8183_SW_RSTN);
}
static irqreturn_t scp_irq_handler(int irq, void *priv)
{
struct mtk_scp *scp = priv;
u32 scp_to_host;
int ret;
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(scp->dev, "failed to enable clocks\n");
return IRQ_NONE;
}
scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
scp_ipi_handler(scp);
else
scp_wdt_handler(scp, scp_to_host);
/* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
scp->reg_base + MT8183_SCP_TO_HOST);
clk_disable_unprepare(scp->clk);
return IRQ_HANDLED;
}
static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = &rproc->dev;
struct elf32_hdr *ehdr;
struct elf32_phdr *phdr;
int i, ret = 0;
const u8 *elf_data = fw->data;
ehdr = (struct elf32_hdr *)elf_data;
phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
/* go through the available ELF segments */
for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
u32 da = phdr->p_paddr;
u32 memsz = phdr->p_memsz;
u32 filesz = phdr->p_filesz;
u32 offset = phdr->p_offset;
void __iomem *ptr;
if (phdr->p_type != PT_LOAD)
continue;
dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
phdr->p_type, da, memsz, filesz);
if (filesz > memsz) {
dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
filesz, memsz);
ret = -EINVAL;
break;
}
if (offset + filesz > fw->size) {
dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
offset + filesz, fw->size);
ret = -EINVAL;
break;
}
/* grab the kernel address for this device address */
ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz);
if (!ptr) {
dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
ret = -EINVAL;
break;
}
/* put the segment where the remote processor expects it */
if (phdr->p_filesz)
scp_memcpy_aligned(ptr, elf_data + phdr->p_offset,
filesz);
}
return ret;
}
static int scp_load(struct rproc *rproc, const struct firmware *fw)
{
const struct mtk_scp *scp = rproc->priv;
struct device *dev = scp->dev;
int ret;
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(dev, "failed to enable clocks\n");
return ret;
}
/* Hold SCP in reset while loading FW. */
scp_reset_assert(scp);
/* Reset clocks before loading FW */
writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
/* Initialize TCM before loading FW. */
writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
/* Turn on the power of SCP's SRAM before using it. */
writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
/*
* Set I-cache and D-cache size before loading SCP FW.
* SCP SRAM logical address may change when cache size setting differs.
*/
writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
scp->reg_base + MT8183_SCP_CACHE_CON);
writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
ret = scp_elf_load_segments(rproc, fw);
clk_disable_unprepare(scp->clk);
return ret;
}
static int scp_start(struct rproc *rproc)
{
struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
struct device *dev = scp->dev;
struct scp_run *run = &scp->run;
int ret;
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(dev, "failed to enable clocks\n");
return ret;
}
run->signaled = false;
scp_reset_deassert(scp);
ret = wait_event_interruptible_timeout(
run->wq,
run->signaled,
msecs_to_jiffies(2000));
if (ret == 0) {
dev_err(dev, "wait SCP initialization timeout!\n");
ret = -ETIME;
goto stop;
}
if (ret == -ERESTARTSYS) {
dev_err(dev, "wait SCP interrupted by a signal!\n");
goto stop;
}
clk_disable_unprepare(scp->clk);
dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
return 0;
stop:
scp_reset_assert(scp);
clk_disable_unprepare(scp->clk);
return ret;
}
static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
{
struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
int offset;
if (da < scp->sram_size) {
offset = da;
if (offset >= 0 && (offset + len) < scp->sram_size)
return (void __force *)scp->sram_base + offset;
} else {
offset = da - scp->dma_addr;
if (offset >= 0 && (offset + len) < scp->dram_size)
return (void __force *)scp->cpu_addr + offset;
}
return NULL;
}
static int scp_stop(struct rproc *rproc)
{
struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
int ret;
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(scp->dev, "failed to enable clocks\n");
return ret;
}
scp_reset_assert(scp);
/* Disable SCP watchdog */
writel(0, scp->reg_base + MT8183_WDT_CFG);
clk_disable_unprepare(scp->clk);
return 0;
}
static const struct rproc_ops scp_ops = {
.start = scp_start,
.stop = scp_stop,
.load = scp_load,
.da_to_va = scp_da_to_va,
};
/**
* scp_get_device() - get device struct of SCP
*
* @scp: mtk_scp structure
**/
struct device *scp_get_device(struct mtk_scp *scp)
{
return scp->dev;
}
EXPORT_SYMBOL_GPL(scp_get_device);
/**
* scp_get_rproc() - get rproc struct of SCP
*
* @scp: mtk_scp structure
**/
struct rproc *scp_get_rproc(struct mtk_scp *scp)
{
return scp->rproc;
}
EXPORT_SYMBOL_GPL(scp_get_rproc);
/**
* scp_get_vdec_hw_capa() - get video decoder hardware capability
*
* @scp: mtk_scp structure
*
* Return: video decoder hardware capability
**/
unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
{
return scp->run.dec_capability;
}
EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
/**
* scp_get_venc_hw_capa() - get video encoder hardware capability
*
* @scp: mtk_scp structure
*
* Return: video encoder hardware capability
**/
unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
{
return scp->run.enc_capability;
}
EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
/**
* scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
*
* @scp: mtk_scp structure
* @mem_addr: SCP views memory address
*
* Mapping the SCP's SRAM address /
* DMEM (Data Extended Memory) memory address /
* Working buffer memory address to
* kernel virtual address.
*
* Return: Return ERR_PTR(-EINVAL) if mapping failed,
* otherwise the mapped kernel virtual address
**/
void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
{
void *ptr;
ptr = scp_da_to_va(scp->rproc, mem_addr, 0);
if (!ptr)
return ERR_PTR(-EINVAL);
return ptr;
}
EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
static int scp_map_memory_region(struct mtk_scp *scp)
{
int ret;
ret = of_reserved_mem_device_init(scp->dev);
if (ret) {
dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
return -ENOMEM;
}
/* Reserved SCP code size */
scp->dram_size = MAX_CODE_SIZE;
scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
&scp->dma_addr, GFP_KERNEL);
if (!scp->cpu_addr)
return -ENOMEM;
return 0;
}
static void scp_unmap_memory_region(struct mtk_scp *scp)
{
dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
scp->dma_addr);
of_reserved_mem_device_release(scp->dev);
}
static int scp_register_ipi(struct platform_device *pdev, u32 id,
ipi_handler_t handler, void *priv)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
return scp_ipi_register(scp, id, handler, priv);
}
static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
scp_ipi_unregister(scp, id);
}
static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
unsigned int len, unsigned int wait)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
return scp_ipi_send(scp, id, buf, len, wait);
}
static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
.send_ipi = scp_send_ipi,
.register_ipi = scp_register_ipi,
.unregister_ipi = scp_unregister_ipi,
.ns_ipi_id = SCP_IPI_NS_SERVICE,
};
static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
{
scp->rpmsg_subdev =
mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
&mtk_scp_rpmsg_info);
if (scp->rpmsg_subdev)
rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
}
static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
{
if (scp->rpmsg_subdev) {
rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
scp->rpmsg_subdev = NULL;
}
}
static int scp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct mtk_scp *scp;
struct rproc *rproc;
struct resource *res;
char *fw_name = "scp.img";
int ret, i;
rproc = rproc_alloc(dev,
np->name,
&scp_ops,
fw_name,
sizeof(*scp));
if (!rproc) {
dev_err(dev, "unable to allocate remoteproc\n");
return -ENOMEM;
}
scp = (struct mtk_scp *)rproc->priv;
scp->rproc = rproc;
scp->dev = dev;
platform_set_drvdata(pdev, scp);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
scp->sram_base = devm_ioremap_resource(dev, res);
if (IS_ERR((__force void *)scp->sram_base)) {
dev_err(dev, "Failed to parse and map sram memory\n");
ret = PTR_ERR((__force void *)scp->sram_base);
goto free_rproc;
}
scp->sram_size = resource_size(res);
mutex_init(&scp->send_lock);
for (i = 0; i < SCP_IPI_MAX; i++)
mutex_init(&scp->ipi_desc[i].lock);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
scp->reg_base = devm_ioremap_resource(dev, res);
if (IS_ERR((__force void *)scp->reg_base)) {
dev_err(dev, "Failed to parse and map cfg memory\n");
ret = PTR_ERR((__force void *)scp->reg_base);
goto destroy_mutex;
}
ret = scp_map_memory_region(scp);
if (ret)
goto destroy_mutex;
scp->clk = devm_clk_get(dev, "main");
if (IS_ERR(scp->clk)) {
dev_err(dev, "Failed to get clock\n");
ret = PTR_ERR(scp->clk);
goto release_dev_mem;
}
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(dev, "failed to enable clocks\n");
goto release_dev_mem;
}
ret = scp_ipi_init(scp);
clk_disable_unprepare(scp->clk);
if (ret) {
dev_err(dev, "Failed to init ipi\n");
goto release_dev_mem;
}
/* register SCP initialization IPI */
ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
if (ret) {
dev_err(dev, "Failed to register IPI_SCP_INIT\n");
goto release_dev_mem;
}
init_waitqueue_head(&scp->run.wq);
init_waitqueue_head(&scp->ack_wq);
scp_add_rpmsg_subdev(scp);
ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
scp_irq_handler, IRQF_ONESHOT,
pdev->name, scp);
if (ret) {
dev_err(dev, "failed to request irq\n");
goto remove_subdev;
}
ret = rproc_add(rproc);
if (ret)
goto remove_subdev;
return 0;
remove_subdev:
scp_remove_rpmsg_subdev(scp);
scp_ipi_unregister(scp, SCP_IPI_INIT);
release_dev_mem:
scp_unmap_memory_region(scp);
destroy_mutex:
for (i = 0; i < SCP_IPI_MAX; i++)
mutex_destroy(&scp->ipi_desc[i].lock);
mutex_destroy(&scp->send_lock);
free_rproc:
rproc_free(rproc);
return ret;
}
static int scp_remove(struct platform_device *pdev)
{
struct mtk_scp *scp = platform_get_drvdata(pdev);
int i;
rproc_del(scp->rproc);
scp_remove_rpmsg_subdev(scp);
scp_ipi_unregister(scp, SCP_IPI_INIT);
scp_unmap_memory_region(scp);
for (i = 0; i < SCP_IPI_MAX; i++)
mutex_destroy(&scp->ipi_desc[i].lock);
mutex_destroy(&scp->send_lock);
rproc_free(scp->rproc);
return 0;
}
static const struct of_device_id mtk_scp_of_match[] = {
{ .compatible = "mediatek,mt8183-scp"},
{},
};
MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
static struct platform_driver mtk_scp_driver = {
.probe = scp_probe,
.remove = scp_remove,
.driver = {
.name = "mtk-scp",
.of_match_table = of_match_ptr(mtk_scp_of_match),
},
};
module_platform_driver(mtk_scp_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek SCP control driver");