linux/drivers/remoteproc/st_slim_rproc.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

336 lines
8.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SLIM core rproc driver
*
* Copyright (C) 2016 STMicroelectronics
*
* Author: Peter Griffin <peter.griffin@linaro.org>
*/
#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%pK\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,
.get_boot_addr = rproc_elf_get_boot_addr,
.load = rproc_elf_load_segments,
.sanity_check = rproc_elf_sanity_check,
};
/**
* 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;
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;
/* 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");