Commit 63c13d61 authored by Erin Lo's avatar Erin Lo Committed by Bjorn Andersson

remoteproc/mediatek: add SCP support for mt8183

Provide a basic driver to control Cortex M4 co-processor
Signed-off-by: default avatarErin Lo <erin.lo@mediatek.com>
Signed-off-by: default avatarNicolas Boichat <drinkcat@chromium.org>
Signed-off-by: default avatarPi-Hsun Shih <pihsun@chromium.org>
Link: https://lore.kernel.org/r/20191112110330.179649-3-pihsun@chromium.orgSigned-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent e47e9887
...@@ -23,6 +23,15 @@ config IMX_REMOTEPROC ...@@ -23,6 +23,15 @@ config IMX_REMOTEPROC
It's safe to say N here. It's safe to say N here.
config MTK_SCP
tristate "Mediatek SCP support"
depends on ARCH_MEDIATEK
help
Say y here to support Mediatek's System Companion Processor (SCP) via
the remote processor framework.
It's safe to say N here.
config OMAP_REMOTEPROC config OMAP_REMOTEPROC
tristate "OMAP remoteproc support" tristate "OMAP remoteproc support"
depends on ARCH_OMAP4 || SOC_OMAP5 depends on ARCH_OMAP4 || SOC_OMAP5
......
...@@ -10,6 +10,7 @@ remoteproc-y += remoteproc_sysfs.o ...@@ -10,6 +10,7 @@ remoteproc-y += remoteproc_sysfs.o
remoteproc-y += remoteproc_virtio.o remoteproc-y += remoteproc_virtio.o
remoteproc-y += remoteproc_elf_loader.o remoteproc-y += remoteproc_elf_loader.o
obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
obj-$(CONFIG_MTK_SCP) += mtk_scp.o mtk_scp_ipi.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
......
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2019 MediaTek Inc.
*/
#ifndef __RPROC_MTK_COMMON_H
#define __RPROC_MTK_COMMON_H
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/mtk_scp.h>
#define MT8183_SW_RSTN 0x0
#define MT8183_SW_RSTN_BIT BIT(0)
#define MT8183_SCP_TO_HOST 0x1C
#define MT8183_SCP_IPC_INT_BIT BIT(0)
#define MT8183_SCP_WDT_INT_BIT BIT(8)
#define MT8183_HOST_TO_SCP 0x28
#define MT8183_HOST_IPC_INT_BIT BIT(0)
#define MT8183_WDT_CFG 0x84
#define MT8183_SCP_CLK_SW_SEL 0x4000
#define MT8183_SCP_CLK_DIV_SEL 0x4024
#define MT8183_SCP_SRAM_PDN 0x402C
#define MT8183_SCP_L1_SRAM_PD 0x4080
#define MT8183_SCP_TCM_TAIL_SRAM_PD 0x4094
#define MT8183_SCP_CACHE_SEL(x) (0x14000 + (x) * 0x3000)
#define MT8183_SCP_CACHE_CON MT8183_SCP_CACHE_SEL(0)
#define MT8183_SCP_DCACHE_CON MT8183_SCP_CACHE_SEL(1)
#define MT8183_SCP_CACHESIZE_8KB BIT(8)
#define MT8183_SCP_CACHE_CON_WAYEN BIT(10)
#define SCP_FW_VER_LEN 32
#define SCP_SHARE_BUFFER_SIZE 288
struct scp_run {
u32 signaled;
s8 fw_ver[SCP_FW_VER_LEN];
u32 dec_capability;
u32 enc_capability;
wait_queue_head_t wq;
};
struct scp_ipi_desc {
/* For protecting handler. */
struct mutex lock;
scp_ipi_handler_t handler;
void *priv;
};
struct mtk_scp {
struct device *dev;
struct rproc *rproc;
struct clk *clk;
void __iomem *reg_base;
void __iomem *sram_base;
size_t sram_size;
struct mtk_share_obj __iomem *recv_buf;
struct mtk_share_obj __iomem *send_buf;
struct scp_run run;
/* To prevent multiple ipi_send run concurrently. */
struct mutex send_lock;
struct scp_ipi_desc ipi_desc[SCP_IPI_MAX];
bool ipi_id_ack[SCP_IPI_MAX];
wait_queue_head_t ack_wq;
void __iomem *cpu_addr;
phys_addr_t phys_addr;
size_t dram_size;
};
/**
* struct mtk_share_obj - SRAM buffer shared with AP and SCP
*
* @id: IPI id
* @len: share buffer length
* @share_buf: share buffer data
*/
struct mtk_share_obj {
u32 id;
u32 len;
u8 share_buf[SCP_SHARE_BUFFER_SIZE];
};
void scp_memcpy_aligned(void __iomem *dst, const void *src, unsigned int len);
void scp_ipi_lock(struct mtk_scp *scp, u32 id);
void scp_ipi_unlock(struct mtk_scp *scp, u32 id);
#endif
This diff is collapsed.
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 MediaTek Inc.
#include <asm/barrier.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/remoteproc/mtk_scp.h>
#include "mtk_common.h"
/**
* scp_ipi_register() - register an ipi function
*
* @scp: mtk_scp structure
* @id: IPI ID
* @handler: IPI handler
* @priv: private data for IPI handler
*
* Register an ipi function to receive ipi interrupt from SCP.
*
* Returns 0 if ipi registers successfully, -error on error.
*/
int scp_ipi_register(struct mtk_scp *scp,
u32 id,
scp_ipi_handler_t handler,
void *priv)
{
if (!scp) {
dev_err(scp->dev, "scp device is not ready\n");
return -EPROBE_DEFER;
}
if (WARN_ON(id >= SCP_IPI_MAX) || WARN_ON(handler == NULL))
return -EINVAL;
scp_ipi_lock(scp, id);
scp->ipi_desc[id].handler = handler;
scp->ipi_desc[id].priv = priv;
scp_ipi_unlock(scp, id);
return 0;
}
EXPORT_SYMBOL_GPL(scp_ipi_register);
/**
* scp_ipi_unregister() - unregister an ipi function
*
* @scp: mtk_scp structure
* @id: IPI ID
*
* Unregister an ipi function to receive ipi interrupt from SCP.
*/
void scp_ipi_unregister(struct mtk_scp *scp, u32 id)
{
if (!scp)
return;
if (WARN_ON(id >= SCP_IPI_MAX))
return;
scp_ipi_lock(scp, id);
scp->ipi_desc[id].handler = NULL;
scp->ipi_desc[id].priv = NULL;
scp_ipi_unlock(scp, id);
}
EXPORT_SYMBOL_GPL(scp_ipi_unregister);
/*
* scp_memcpy_aligned() - Copy src to dst, where dst is in SCP SRAM region.
*
* @dst: Pointer to the destination buffer, should be in SCP SRAM region.
* @src: Pointer to the source buffer.
* @len: Length of the source buffer to be copied.
*
* Since AP access of SCP SRAM don't support byte write, this always write a
* full word at a time, and may cause some extra bytes to be written at the
* beginning & ending of dst.
*/
void scp_memcpy_aligned(void __iomem *dst, const void *src, unsigned int len)
{
void __iomem *ptr;
u32 val;
unsigned int i = 0, remain;
if (!IS_ALIGNED((unsigned long)dst, 4)) {
ptr = (void __iomem *)ALIGN_DOWN((unsigned long)dst, 4);
i = 4 - (dst - ptr);
val = readl_relaxed(ptr);
memcpy((u8 *)&val + (4 - i), src, i);
writel_relaxed(val, ptr);
}
__iowrite32_copy(dst + i, src + i, (len - i) / 4);
remain = (len - i) % 4;
if (remain > 0) {
val = readl_relaxed(dst + len - remain);
memcpy(&val, src + len - remain, remain);
writel_relaxed(val, dst + len - remain);
}
}
EXPORT_SYMBOL_GPL(scp_memcpy_aligned);
/**
* scp_ipi_lock() - Lock before operations of an IPI ID
*
* @scp: mtk_scp structure
* @id: IPI ID
*
* Note: This should not be used by drivers other than mtk_scp.
*/
void scp_ipi_lock(struct mtk_scp *scp, u32 id)
{
if (WARN_ON(id >= SCP_IPI_MAX))
return;
mutex_lock(&scp->ipi_desc[id].lock);
}
EXPORT_SYMBOL_GPL(scp_ipi_lock);
/**
* scp_ipi_lock() - Unlock after operations of an IPI ID
*
* @scp: mtk_scp structure
* @id: IPI ID
*
* Note: This should not be used by drivers other than mtk_scp.
*/
void scp_ipi_unlock(struct mtk_scp *scp, u32 id)
{
if (WARN_ON(id >= SCP_IPI_MAX))
return;
mutex_unlock(&scp->ipi_desc[id].lock);
}
EXPORT_SYMBOL_GPL(scp_ipi_unlock);
/**
* scp_ipi_send() - send data from AP to scp.
*
* @scp: mtk_scp structure
* @id: IPI ID
* @buf: the data buffer
* @len: the data buffer length
* @wait: number of msecs to wait for ack. 0 to skip waiting.
*
* This function is thread-safe. When this function returns,
* SCP has received the data and starts the processing.
* When the processing completes, IPI handler registered
* by scp_ipi_register will be called in interrupt context.
*
* Returns 0 if sending data successfully, -error on error.
**/
int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
unsigned int wait)
{
struct mtk_share_obj __iomem *send_obj = scp->send_buf;
unsigned long timeout;
int ret;
if (WARN_ON(id <= SCP_IPI_INIT) || WARN_ON(id >= SCP_IPI_MAX) ||
WARN_ON(len > sizeof(send_obj->share_buf)) || WARN_ON(!buf))
return -EINVAL;
mutex_lock(&scp->send_lock);
ret = clk_prepare_enable(scp->clk);
if (ret) {
dev_err(scp->dev, "failed to enable clock\n");
goto unlock_mutex;
}
/* Wait until SCP receives the last command */
timeout = jiffies + msecs_to_jiffies(2000);
do {
if (time_after(jiffies, timeout)) {
dev_err(scp->dev, "%s: IPI timeout!\n", __func__);
ret = -ETIMEDOUT;
goto clock_disable;
}
} while (readl(scp->reg_base + MT8183_HOST_TO_SCP));
scp_memcpy_aligned(send_obj->share_buf, buf, len);
writel(len, &send_obj->len);
writel(id, &send_obj->id);
scp->ipi_id_ack[id] = false;
/* send the command to SCP */
writel(MT8183_HOST_IPC_INT_BIT, scp->reg_base + MT8183_HOST_TO_SCP);
if (wait) {
/* wait for SCP's ACK */
timeout = msecs_to_jiffies(wait);
ret = wait_event_timeout(scp->ack_wq,
scp->ipi_id_ack[id],
timeout);
scp->ipi_id_ack[id] = false;
if (WARN(!ret, "scp ipi %d ack time out !", id))
ret = -EIO;
else
ret = 0;
}
clock_disable:
clk_disable_unprepare(scp->clk);
unlock_mutex:
mutex_unlock(&scp->send_lock);
return ret;
}
EXPORT_SYMBOL_GPL(scp_ipi_send);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek scp IPI interface");
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2019 MediaTek Inc.
*/
#ifndef _MTK_SCP_H
#define _MTK_SCP_H
#include <linux/platform_device.h>
typedef void (*scp_ipi_handler_t) (void *data,
unsigned int len,
void *priv);
struct mtk_scp;
/**
* enum ipi_id - the id of inter-processor interrupt
*
* @SCP_IPI_INIT: The interrupt from scp is to notfiy kernel
* SCP initialization completed.
* IPI_SCP_INIT is sent from SCP when firmware is
* loaded. AP doesn't need to send IPI_SCP_INIT
* command to SCP.
* For other IPI below, AP should send the request
* to SCP to trigger the interrupt.
* @SCP_IPI_MAX: The maximum IPI number
*/
enum scp_ipi_id {
SCP_IPI_INIT = 0,
SCP_IPI_VDEC_H264,
SCP_IPI_VDEC_VP8,
SCP_IPI_VDEC_VP9,
SCP_IPI_VENC_H264,
SCP_IPI_VENC_VP8,
SCP_IPI_MDP_INIT,
SCP_IPI_MDP_DEINIT,
SCP_IPI_MDP_FRAME,
SCP_IPI_DIP,
SCP_IPI_ISP_CMD,
SCP_IPI_ISP_FRAME,
SCP_IPI_FD_CMD,
SCP_IPI_CROS_HOST_CMD,
SCP_IPI_MAX,
};
struct mtk_scp *scp_get(struct platform_device *pdev);
void scp_put(struct mtk_scp *scp);
struct device *scp_get_device(struct mtk_scp *scp);
struct rproc *scp_get_rproc(struct mtk_scp *scp);
int scp_ipi_register(struct mtk_scp *scp, u32 id, scp_ipi_handler_t handler,
void *priv);
void scp_ipi_unregister(struct mtk_scp *scp, u32 id);
int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,
unsigned int wait);
unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp);
unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp);
void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr);
#endif /* _MTK_SCP_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment