linux-stable/drivers/remoteproc/ingenic_rproc.c
Mathieu Poirier 4605ad8f45 remoteproc: ingenic: Move clock handling to prepare/unprepare callbacks
This patch moves clock related operations to the remoteproc prepare()
and unprepare() callbacks so that the PM runtime framework doesn't
have to be involved needlessly.  This provides a simpler approach and
requires less code.

Based on the work from Paul Cercueil published here:
https://lore.kernel.org/linux-remoteproc/20191116170846.67220-4-paul@crapouillou.net/

Reviewed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200630163118.3830422-2-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-07-01 16:05:18 -07:00

248 lines
5.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Ingenic JZ47xx remoteproc driver
* Copyright 2019, Paul Cercueil <paul@crapouillou.net>
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include "remoteproc_internal.h"
#define REG_AUX_CTRL 0x0
#define REG_AUX_MSG_ACK 0x10
#define REG_AUX_MSG 0x14
#define REG_CORE_MSG_ACK 0x18
#define REG_CORE_MSG 0x1C
#define AUX_CTRL_SLEEP BIT(31)
#define AUX_CTRL_MSG_IRQ_EN BIT(3)
#define AUX_CTRL_NMI_RESETS BIT(2)
#define AUX_CTRL_NMI BIT(1)
#define AUX_CTRL_SW_RESET BIT(0)
struct vpu_mem_map {
const char *name;
unsigned int da;
};
struct vpu_mem_info {
const struct vpu_mem_map *map;
unsigned long len;
void __iomem *base;
};
static const struct vpu_mem_map vpu_mem_map[] = {
{ "tcsm0", 0x132b0000 },
{ "tcsm1", 0xf4000000 },
{ "sram", 0x132f0000 },
};
/**
* struct vpu - Ingenic VPU remoteproc private structure
* @irq: interrupt number
* @clks: pointers to the VPU and AUX clocks
* @aux_base: raw pointer to the AUX interface registers
* @mem_info: array of struct vpu_mem_info, which contain the mapping info of
* each of the external memories
* @dev: private pointer to the device
*/
struct vpu {
int irq;
struct clk_bulk_data clks[2];
void __iomem *aux_base;
struct vpu_mem_info mem_info[ARRAY_SIZE(vpu_mem_map)];
struct device *dev;
};
static int ingenic_rproc_prepare(struct rproc *rproc)
{
struct vpu *vpu = rproc->priv;
int ret;
/* The clocks must be enabled for the firmware to be loaded in TCSM */
ret = clk_bulk_prepare_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
if (ret)
dev_err(vpu->dev, "Unable to start clocks: %d\n", ret);
return ret;
}
static int ingenic_rproc_unprepare(struct rproc *rproc)
{
struct vpu *vpu = rproc->priv;
clk_bulk_disable_unprepare(ARRAY_SIZE(vpu->clks), vpu->clks);
return 0;
}
static int ingenic_rproc_start(struct rproc *rproc)
{
struct vpu *vpu = rproc->priv;
u32 ctrl;
enable_irq(vpu->irq);
/* Reset the AUX and enable message IRQ */
ctrl = AUX_CTRL_NMI_RESETS | AUX_CTRL_NMI | AUX_CTRL_MSG_IRQ_EN;
writel(ctrl, vpu->aux_base + REG_AUX_CTRL);
return 0;
}
static int ingenic_rproc_stop(struct rproc *rproc)
{
struct vpu *vpu = rproc->priv;
disable_irq(vpu->irq);
/* Keep AUX in reset mode */
writel(AUX_CTRL_SW_RESET, vpu->aux_base + REG_AUX_CTRL);
return 0;
}
static void ingenic_rproc_kick(struct rproc *rproc, int vqid)
{
struct vpu *vpu = rproc->priv;
writel(vqid, vpu->aux_base + REG_CORE_MSG);
}
static void *ingenic_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
{
struct vpu *vpu = rproc->priv;
void __iomem *va = NULL;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
const struct vpu_mem_info *info = &vpu->mem_info[i];
const struct vpu_mem_map *map = info->map;
if (da >= map->da && (da + len) < (map->da + info->len)) {
va = info->base + (da - map->da);
break;
}
}
return (__force void *)va;
}
static struct rproc_ops ingenic_rproc_ops = {
.prepare = ingenic_rproc_prepare,
.unprepare = ingenic_rproc_unprepare,
.start = ingenic_rproc_start,
.stop = ingenic_rproc_stop,
.kick = ingenic_rproc_kick,
.da_to_va = ingenic_rproc_da_to_va,
};
static irqreturn_t vpu_interrupt(int irq, void *data)
{
struct rproc *rproc = data;
struct vpu *vpu = rproc->priv;
u32 vring;
vring = readl(vpu->aux_base + REG_AUX_MSG);
/* Ack the interrupt */
writel(0, vpu->aux_base + REG_AUX_MSG_ACK);
return rproc_vq_interrupt(rproc, vring);
}
static int ingenic_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *mem;
struct rproc *rproc;
struct vpu *vpu;
unsigned int i;
int ret;
rproc = devm_rproc_alloc(dev, "ingenic-vpu",
&ingenic_rproc_ops, NULL, sizeof(*vpu));
if (!rproc)
return -ENOMEM;
vpu = rproc->priv;
vpu->dev = &pdev->dev;
platform_set_drvdata(pdev, vpu);
mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "aux");
vpu->aux_base = devm_ioremap_resource(dev, mem);
if (IS_ERR(vpu->aux_base)) {
dev_err(dev, "Failed to ioremap\n");
return PTR_ERR(vpu->aux_base);
}
for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
vpu_mem_map[i].name);
vpu->mem_info[i].base = devm_ioremap_resource(dev, mem);
if (IS_ERR(vpu->mem_info[i].base)) {
ret = PTR_ERR(vpu->mem_info[i].base);
dev_err(dev, "Failed to ioremap\n");
return ret;
}
vpu->mem_info[i].len = resource_size(mem);
vpu->mem_info[i].map = &vpu_mem_map[i];
}
vpu->clks[0].id = "vpu";
vpu->clks[1].id = "aux";
ret = devm_clk_bulk_get(dev, ARRAY_SIZE(vpu->clks), vpu->clks);
if (ret) {
dev_err(dev, "Failed to get clocks\n");
return ret;
}
vpu->irq = platform_get_irq(pdev, 0);
if (vpu->irq < 0)
return vpu->irq;
ret = devm_request_irq(dev, vpu->irq, vpu_interrupt, 0, "VPU", rproc);
if (ret < 0) {
dev_err(dev, "Failed to request IRQ\n");
return ret;
}
disable_irq(vpu->irq);
ret = devm_rproc_add(dev, rproc);
if (ret) {
dev_err(dev, "Failed to register remote processor\n");
return ret;
}
return 0;
}
static const struct of_device_id ingenic_rproc_of_matches[] = {
{ .compatible = "ingenic,jz4770-vpu-rproc", },
{}
};
MODULE_DEVICE_TABLE(of, ingenic_rproc_of_matches);
static struct platform_driver ingenic_rproc_driver = {
.probe = ingenic_rproc_probe,
.driver = {
.name = "ingenic-vpu",
.of_match_table = ingenic_rproc_of_matches,
},
};
module_platform_driver(ingenic_rproc_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
MODULE_DESCRIPTION("Ingenic JZ47xx Remote Processor control driver");