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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/drivers/remoteproc/st_slim_rproc.c
Bhumika Goyal c008fad264 drivers: remoteproc: constify rproc_ops structures
Declare rproc_ops structures as const as they are only passed as an
argument to the function rproc_alloc. This argument is of type const, so
rproc_ops structures having this property can be declared const too.
Done using Coccinelle:

@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct rproc_ops i@p = {...};

@ok1@
identifier r1.i;
position p;
@@
rproc_alloc(...,&i@p,...)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct rproc_ops i;

File size details:

Size of the file remoteproc/da8xx_remoteproc.o remains the same before and
after applying the changes.

   text	   data	    bss	    dec	    hex	filename
   1312	    100	      4	   1416	    588 remoteproc/da8xx_remoteproc.o
   1312	    100	      4	   1416	    588 remoteproc/da8xx_remoteproc.o

    970	    240	      0	   1210	    4ba remoteproc/omap_remoteproc.o
   1002	    192	      0	   1194	    4aa remoteproc/omap_remoteproc.o

   1901	    240	      0	   2141	    85d remoteproc/st_remoteproc.o
   1933	    192	      0	   2125	    84d remoteproc/st_remoteproc.o

   1288	     96	      0	   1384	    568 remoteproc/st_slim_rproc.o
   1320	     64	      0	   1384	    568 remoteproc/st_slim_rproc.o

   2121	    240	      0	   2361	    939 remoteproc/wkup_m3_rproc.o
   2161	    192	      0	   2353	    931 remoteproc/wkup_m3_rproc.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-01-18 10:46:50 -08:00

365 lines
9.0 KiB
C

/*
* SLIM core rproc driver
*
* Copyright (C) 2016 STMicroelectronics
*
* Author: Peter Griffin <peter.griffin@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/st_slim_rproc.h>
#include "remoteproc_internal.h"
/* SLIM core registers */
#define SLIM_ID_OFST 0x0
#define SLIM_VER_OFST 0x4
#define SLIM_EN_OFST 0x8
#define SLIM_EN_RUN BIT(0)
#define SLIM_CLK_GATE_OFST 0xC
#define SLIM_CLK_GATE_DIS BIT(0)
#define SLIM_CLK_GATE_RESET BIT(2)
#define SLIM_SLIM_PC_OFST 0x20
/* DMEM registers */
#define SLIM_REV_ID_OFST 0x0
#define SLIM_REV_ID_MIN_MASK GENMASK(15, 8)
#define SLIM_REV_ID_MIN(id) ((id & SLIM_REV_ID_MIN_MASK) >> 8)
#define SLIM_REV_ID_MAJ_MASK GENMASK(23, 16)
#define SLIM_REV_ID_MAJ(id) ((id & SLIM_REV_ID_MAJ_MASK) >> 16)
/* peripherals registers */
#define SLIM_STBUS_SYNC_OFST 0xF88
#define SLIM_STBUS_SYNC_DIS BIT(0)
#define SLIM_INT_SET_OFST 0xFD4
#define SLIM_INT_CLR_OFST 0xFD8
#define SLIM_INT_MASK_OFST 0xFDC
#define SLIM_CMD_CLR_OFST 0xFC8
#define SLIM_CMD_MASK_OFST 0xFCC
static const char *mem_names[ST_SLIM_MEM_MAX] = {
[ST_SLIM_DMEM] = "dmem",
[ST_SLIM_IMEM] = "imem",
};
static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev)
{
int clk, err;
for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) {
slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
if (IS_ERR(slim_rproc->clks[clk])) {
err = PTR_ERR(slim_rproc->clks[clk]);
if (err == -EPROBE_DEFER)
goto err_put_clks;
slim_rproc->clks[clk] = NULL;
break;
}
}
return 0;
err_put_clks:
while (--clk >= 0)
clk_put(slim_rproc->clks[clk]);
return err;
}
static void slim_clk_disable(struct st_slim_rproc *slim_rproc)
{
int clk;
for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
clk_disable_unprepare(slim_rproc->clks[clk]);
}
static int slim_clk_enable(struct st_slim_rproc *slim_rproc)
{
int clk, ret;
for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) {
ret = clk_prepare_enable(slim_rproc->clks[clk]);
if (ret)
goto err_disable_clks;
}
return 0;
err_disable_clks:
while (--clk >= 0)
clk_disable_unprepare(slim_rproc->clks[clk]);
return ret;
}
/*
* Remoteproc slim specific device handlers
*/
static int slim_rproc_start(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
struct st_slim_rproc *slim_rproc = rproc->priv;
unsigned long hw_id, hw_ver, fw_rev;
u32 val;
/* disable CPU pipeline clock & reset CPU pipeline */
val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET;
writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
/* disable SLIM core STBus sync */
writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST);
/* enable cpu pipeline clock */
writel(!SLIM_CLK_GATE_DIS,
slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
/* clear int & cmd mailbox */
writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST);
writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST);
/* enable all channels cmd & int */
writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST);
writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST);
/* enable cpu */
writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST);
hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST);
fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr +
SLIM_REV_ID_OFST);
dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev),
hw_id, hw_ver);
return 0;
}
static int slim_rproc_stop(struct rproc *rproc)
{
struct st_slim_rproc *slim_rproc = rproc->priv;
u32 val;
/* mask all (cmd & int) channels */
writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST);
writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST);
/* disable cpu pipeline clock */
writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
val = readl(slim_rproc->slimcore + SLIM_EN_OFST);
if (val & SLIM_EN_RUN)
dev_warn(&rproc->dev, "Failed to disable SLIM");
dev_dbg(&rproc->dev, "slim stopped\n");
return 0;
}
static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
{
struct st_slim_rproc *slim_rproc = rproc->priv;
void *va = NULL;
int i;
for (i = 0; i < ST_SLIM_MEM_MAX; i++) {
if (da != slim_rproc->mem[i].bus_addr)
continue;
if (len <= slim_rproc->mem[i].size) {
/* __force to make sparse happy with type conversion */
va = (__force void *)slim_rproc->mem[i].cpu_addr;
break;
}
}
dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
return va;
}
static const struct rproc_ops slim_rproc_ops = {
.start = slim_rproc_start,
.stop = slim_rproc_stop,
.da_to_va = slim_rproc_da_to_va,
};
/*
* Firmware handler operations: sanity, boot address, load ...
*/
static struct resource_table empty_rsc_tbl = {
.ver = 1,
.num = 0,
};
static struct resource_table *slim_rproc_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz)
{
*tablesz = sizeof(empty_rsc_tbl);
return &empty_rsc_tbl;
}
static struct rproc_fw_ops slim_rproc_fw_ops = {
.find_rsc_table = slim_rproc_find_rsc_table,
};
/**
* st_slim_rproc_alloc() - allocate and initialise slim rproc
* @pdev: Pointer to the platform_device struct
* @fw_name: Name of firmware for rproc to use
*
* Function for allocating and initialising a slim rproc for use by
* device drivers whose IP is based around the SLIM core. It
* obtains and enables any clocks required by the SLIM core and also
* ioremaps the various IO.
*
* Returns st_slim_rproc pointer or PTR_ERR() on error.
*/
struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev,
char *fw_name)
{
struct device *dev = &pdev->dev;
struct st_slim_rproc *slim_rproc;
struct device_node *np = dev->of_node;
struct rproc *rproc;
struct resource *res;
int err, i;
const struct rproc_fw_ops *elf_ops;
if (!fw_name)
return ERR_PTR(-EINVAL);
if (!of_device_is_compatible(np, "st,slim-rproc"))
return ERR_PTR(-EINVAL);
rproc = rproc_alloc(dev, np->name, &slim_rproc_ops,
fw_name, sizeof(*slim_rproc));
if (!rproc)
return ERR_PTR(-ENOMEM);
rproc->has_iommu = false;
slim_rproc = rproc->priv;
slim_rproc->rproc = rproc;
elf_ops = rproc->fw_ops;
/* Use some generic elf ops */
slim_rproc_fw_ops.load = elf_ops->load;
slim_rproc_fw_ops.sanity_check = elf_ops->sanity_check;
rproc->fw_ops = &slim_rproc_fw_ops;
/* get imem and dmem */
for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
mem_names[i]);
slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(slim_rproc->mem[i].cpu_addr)) {
dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
err = PTR_ERR(slim_rproc->mem[i].cpu_addr);
goto err;
}
slim_rproc->mem[i].bus_addr = res->start;
slim_rproc->mem[i].size = resource_size(res);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore");
slim_rproc->slimcore = devm_ioremap_resource(dev, res);
if (IS_ERR(slim_rproc->slimcore)) {
dev_err(&pdev->dev, "failed to ioremap slimcore IO\n");
err = PTR_ERR(slim_rproc->slimcore);
goto err;
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals");
slim_rproc->peri = devm_ioremap_resource(dev, res);
if (IS_ERR(slim_rproc->peri)) {
dev_err(&pdev->dev, "failed to ioremap peripherals IO\n");
err = PTR_ERR(slim_rproc->peri);
goto err;
}
err = slim_clk_get(slim_rproc, dev);
if (err)
goto err;
err = slim_clk_enable(slim_rproc);
if (err) {
dev_err(dev, "Failed to enable clocks\n");
goto err_clk_put;
}
/* Register as a remoteproc device */
err = rproc_add(rproc);
if (err) {
dev_err(dev, "registration of slim remoteproc failed\n");
goto err_clk_dis;
}
return slim_rproc;
err_clk_dis:
slim_clk_disable(slim_rproc);
err_clk_put:
for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
clk_put(slim_rproc->clks[i]);
err:
rproc_free(rproc);
return ERR_PTR(err);
}
EXPORT_SYMBOL(st_slim_rproc_alloc);
/**
* st_slim_rproc_put() - put slim rproc resources
* @slim_rproc: Pointer to the st_slim_rproc struct
*
* Function for calling respective _put() functions on slim_rproc resources.
*
*/
void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
{
int clk;
if (!slim_rproc)
return;
slim_clk_disable(slim_rproc);
for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
clk_put(slim_rproc->clks[clk]);
rproc_del(slim_rproc->rproc);
rproc_free(slim_rproc->rproc);
}
EXPORT_SYMBOL(st_slim_rproc_put);
MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver");
MODULE_LICENSE("GPL v2");