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Date: Mon, 21 Jan 2019 15:03:52 +0800
From: Peter Shih <pihsun@...omium.org>
To: Nicolas Boichat <drinkcat@...omium.org>
Cc: Ohad Ben-Cohen <ohad@...ery.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
open list <linux-kernel@...r.kernel.org>,
"open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM"
<linux-remoteproc@...r.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>
Subject: Re: [RFC v2 3/6] remoteproc: move IPI interface into separate file.
On Sat, Jan 19, 2019 at 5:04 AM Nicolas Boichat <drinkcat@...omium.org> wrote:
>
> Hi,
>
> On Mon, Jan 7, 2019 at 9:26 PM Pi-Hsun Shih <pihsun@...omium.org> wrote:
> >
> > Move the IPI interface into a separate file mtk_scp_ipi.c, so the things
> > that use the interface only can depend on the module only.
> >
> > Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>
> > ---
> > Changes from v1:
> > - Resolved conflict because of change in Patch 2.
> > ---
> > drivers/remoteproc/Makefile | 2 +-
> > drivers/remoteproc/mtk_common.h | 73 +++++++++++++++
> > drivers/remoteproc/mtk_scp.c | 154 +------------------------------
>
> The fact that you remove a bunch of stuff from mtk_scp.c makes me
> think that we should probably reorganize the patches. The series here
> shows the history of how we developed this, but for upstreaming
> purpose, we want independent, small-ish patches.
>
> Maybe 2/6 should contain just basic mtk_scp code with no IPI. 3/6 IPI
> only, and _maybe_ 4/6 rpmsg should be folded into 3/6?
>
> Thanks,
>
I think it's hard to have mtk_scp code without IPI, since the
initialization itself depends on IPI.
I'll fold 3/6 into 2/6 in v3.
> > drivers/remoteproc/mtk_scp_ipi.c | 108 ++++++++++++++++++++++
> > 4 files changed, 183 insertions(+), 154 deletions(-)
> > create mode 100644 drivers/remoteproc/mtk_common.h
> > create mode 100644 drivers/remoteproc/mtk_scp_ipi.c
> >
> > diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> > index 98e3498dbbe0e2..16b3e5e7a81c8e 100644
> > --- a/drivers/remoteproc/Makefile
> > +++ b/drivers/remoteproc/Makefile
> > @@ -10,7 +10,7 @@ remoteproc-y += remoteproc_sysfs.o
> > remoteproc-y += remoteproc_virtio.o
> > remoteproc-y += remoteproc_elf_loader.o
> > obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
> > -obj-$(CONFIG_MTK_SCP) += mtk_scp.o
> > +obj-$(CONFIG_MTK_SCP) += mtk_scp.o mtk_scp_ipi.o
> > obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
> > obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
> > obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
> > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> > new file mode 100644
> > index 00000000000000..e97287a4eb25cc
> > --- /dev/null
> > +++ b/drivers/remoteproc/mtk_common.h
> > @@ -0,0 +1,73 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +//
> > +// Copyright (c) 2018 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>
> > +
> > +#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_SCP_SRAM_PDN 0x402C
> > +
> > +#define SCP_FW_VER_LEN 32
> > +
> > +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 {
> > + scp_ipi_handler_t handler;
> > + const char *name;
> > + 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 share_obj *recv_buf;
> > + struct share_obj *send_buf;
> > + struct scp_run run;
> > + struct mutex scp_mutex; /* for protecting mtk_scp data structure */
> > + 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 share_obj - SRAM buffer shared with
> > + * AP and SCP
> > + *
> > + * @id: IPI id
> > + * @len: share buffer length
> > + * @share_buf: share buffer data
> > + */
> > +struct share_obj {
> > + s32 id;
> > + u32 len;
> > + u8 share_buf[288];
> > +};
> > +
> > +#endif
> > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> > index 6e2e17a227d018..3e84c696523436 100644
> > --- a/drivers/remoteproc/mtk_scp.c
> > +++ b/drivers/remoteproc/mtk_scp.c
> > @@ -13,163 +13,11 @@
> > #include <linux/platform_device.h>
> > #include <linux/remoteproc.h>
> >
> > +#include "mtk_common.h"
> > #include "remoteproc_internal.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_SCP_SRAM_PDN 0x402C
> > -
> > -#define SCP_FW_VER_LEN 32
> > -
> > #define MAX_CODE_SIZE 0x500000
> >
> > -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 {
> > - scp_ipi_handler_t handler;
> > - const char *name;
> > - 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 share_obj *recv_buf;
> > - struct share_obj *send_buf;
> > - struct scp_run run;
> > - struct mutex scp_mutex; /* for protecting mtk_scp data structure */
> > - 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 share_obj - SRAM buffer shared with
> > - * AP and SCP
> > - *
> > - * @id: IPI id
> > - * @len: share buffer length
> > - * @share_buf: share buffer data
> > - */
> > -struct share_obj {
> > - s32 id;
> > - u32 len;
> > - u8 share_buf[288];
> > -};
> > -
> > -int scp_ipi_register(struct platform_device *pdev,
> > - enum scp_ipi_id id,
> > - scp_ipi_handler_t handler,
> > - const char *name,
> > - void *priv)
> > -{
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > - struct scp_ipi_desc *ipi_desc;
> > -
> > - if (!scp) {
> > - dev_err(&pdev->dev, "scp device is not ready\n");
> > - return -EPROBE_DEFER;
> > - }
> > -
> > - if (WARN(id < 0 || id >= SCP_IPI_MAX || handler == NULL,
> > - "register scp ipi id %d with invalid arguments\n", id))
> > - return -EINVAL;
> > -
> > - ipi_desc = scp->ipi_desc;
> > - ipi_desc[id].name = name;
> > - ipi_desc[id].handler = handler;
> > - ipi_desc[id].priv = priv;
> > -
> > - return 0;
> > -}
> > -EXPORT_SYMBOL_GPL(scp_ipi_register);
> > -
> > -int scp_ipi_send(struct platform_device *pdev,
> > - enum scp_ipi_id id,
> > - void *buf,
> > - unsigned int len,
> > - unsigned int wait)
> > -{
> > - struct mtk_scp *scp = platform_get_drvdata(pdev);
> > - struct share_obj *send_obj = scp->send_buf;
> > - unsigned long timeout;
> > - int ret;
> > -
> > - if (WARN(id <= SCP_IPI_INIT || id >= SCP_IPI_MAX ||
> > - len > sizeof(send_obj->share_buf) || !buf,
> > - "failed to send ipi message\n"))
> > - return -EINVAL;
> > -
> > - ret = clk_prepare_enable(scp->clk);
> > - if (ret) {
> > - dev_err(scp->dev, "failed to enable clock\n");
> > - return ret;
> > - }
> > -
> > - mutex_lock(&scp->scp_mutex);
> > -
> > - /* Wait until SCP receives the last command */
> > - timeout = jiffies + msecs_to_jiffies(2000);
> > - do {
> > - if (time_after(jiffies, timeout)) {
> > - dev_err(scp->dev, "scp_ipi_send: IPI timeout!\n");
> > - ret = -EIO;
> > - mutex_unlock(&scp->scp_mutex);
> > - goto clock_disable;
> > - }
> > - } while (readl(scp->reg_base + MT8183_HOST_TO_SCP));
> > -
> > - memcpy(send_obj->share_buf, buf, len);
> > - send_obj->len = len;
> > - send_obj->id = 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);
> > -
> > - mutex_unlock(&scp->scp_mutex);
> > -
> > - 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);
> > -
> > - return ret;
> > -}
> > -EXPORT_SYMBOL_GPL(scp_ipi_send);
> > -
> > struct platform_device *scp_get_plat_device(struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> > diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
> > new file mode 100644
> > index 00000000000000..3aa18a387056d3
> > --- /dev/null
> > +++ b/drivers/remoteproc/mtk_scp_ipi.c
> > @@ -0,0 +1,108 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +//
> > +// Copyright (c) 2018 MediaTek Inc.
> > +
> > +#include <linux/clk.h>
> > +#include <linux/err.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_data/mtk_scp.h>
> > +#include <linux/platform_device.h>
> > +
> > +#include "mtk_common.h"
> > +
> > +int scp_ipi_register(struct platform_device *pdev,
> > + enum scp_ipi_id id,
> > + scp_ipi_handler_t handler,
> > + const char *name,
> > + void *priv)
> > +{
> > + struct mtk_scp *scp = platform_get_drvdata(pdev);
> > + struct scp_ipi_desc *ipi_desc;
> > +
> > + if (!scp) {
> > + dev_err(&pdev->dev, "scp device is not ready\n");
> > + return -EPROBE_DEFER;
> > + }
> > +
> > + if (WARN(id < 0 || id >= SCP_IPI_MAX || handler == NULL,
> > + "register scp ipi id %d with invalid arguments\n", id))
> > + return -EINVAL;
> > +
> > + ipi_desc = scp->ipi_desc;
> > + ipi_desc[id].name = name;
> > + ipi_desc[id].handler = handler;
> > + ipi_desc[id].priv = priv;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(scp_ipi_register);
> > +
> > +int scp_ipi_send(struct platform_device *pdev,
> > + enum scp_ipi_id id,
> > + void *buf,
> > + unsigned int len,
> > + unsigned int wait)
> > +{
> > + struct mtk_scp *scp = platform_get_drvdata(pdev);
> > + struct share_obj *send_obj = scp->send_buf;
> > + unsigned long timeout;
> > + int ret;
> > +
> > + if (WARN(id <= SCP_IPI_INIT || id >= SCP_IPI_MAX ||
> > + len > sizeof(send_obj->share_buf) || !buf,
> > + "failed to send ipi message\n"))
> > + return -EINVAL;
> > +
> > + ret = clk_prepare_enable(scp->clk);
> > + if (ret) {
> > + dev_err(scp->dev, "failed to enable clock\n");
> > + return ret;
> > + }
> > +
> > + mutex_lock(&scp->scp_mutex);
> > +
> > + /* Wait until SCP receives the last command */
> > + timeout = jiffies + msecs_to_jiffies(2000);
> > + do {
> > + if (time_after(jiffies, timeout)) {
> > + dev_err(scp->dev, "scp_ipi_send: IPI timeout!\n");
> > + ret = -EIO;
> > + mutex_unlock(&scp->scp_mutex);
> > + goto clock_disable;
> > + }
> > + } while (readl(scp->reg_base + MT8183_HOST_TO_SCP));
> > +
> > + memcpy(send_obj->share_buf, buf, len);
> > + send_obj->len = len;
> > + send_obj->id = 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);
> > +
> > + mutex_unlock(&scp->scp_mutex);
> > +
> > + 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);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(scp_ipi_send);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("MediaTek scp IPI interface");
> > --
> > 2.20.1.97.g81188d93c3-goog
> >
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