forked from Minki/linux
c6b69bf143
In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().
Fixes: 3e99cb214f
("soc: ti: add initial PRM driver with reset control support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
392 lines
11 KiB
C
392 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* OMAP2+ PRM driver
|
|
*
|
|
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Tero Kristo <t-kristo@ti.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/iopoll.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/platform_data/ti-prm.h>
|
|
|
|
struct omap_rst_map {
|
|
s8 rst;
|
|
s8 st;
|
|
};
|
|
|
|
struct omap_prm_data {
|
|
u32 base;
|
|
const char *name;
|
|
const char *clkdm_name;
|
|
u16 rstctrl;
|
|
u16 rstst;
|
|
const struct omap_rst_map *rstmap;
|
|
u8 flags;
|
|
};
|
|
|
|
struct omap_prm {
|
|
const struct omap_prm_data *data;
|
|
void __iomem *base;
|
|
};
|
|
|
|
struct omap_reset_data {
|
|
struct reset_controller_dev rcdev;
|
|
struct omap_prm *prm;
|
|
u32 mask;
|
|
spinlock_t lock;
|
|
struct clockdomain *clkdm;
|
|
struct device *dev;
|
|
};
|
|
|
|
#define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev)
|
|
|
|
#define OMAP_MAX_RESETS 8
|
|
#define OMAP_RESET_MAX_WAIT 10000
|
|
|
|
#define OMAP_PRM_HAS_RSTCTRL BIT(0)
|
|
#define OMAP_PRM_HAS_RSTST BIT(1)
|
|
#define OMAP_PRM_HAS_NO_CLKDM BIT(2)
|
|
|
|
#define OMAP_PRM_HAS_RESETS (OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST)
|
|
|
|
static const struct omap_rst_map rst_map_0[] = {
|
|
{ .rst = 0, .st = 0 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_rst_map rst_map_01[] = {
|
|
{ .rst = 0, .st = 0 },
|
|
{ .rst = 1, .st = 1 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_rst_map rst_map_012[] = {
|
|
{ .rst = 0, .st = 0 },
|
|
{ .rst = 1, .st = 1 },
|
|
{ .rst = 2, .st = 2 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_prm_data omap4_prm_data[] = {
|
|
{ .name = "tesla", .base = 0x4a306400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "core", .base = 0x4a306700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ducati", .rstmap = rst_map_012 },
|
|
{ .name = "ivahd", .base = 0x4a306f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
|
|
{ .name = "device", .base = 0x4a307b00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
|
|
{ },
|
|
};
|
|
|
|
static const struct omap_prm_data omap5_prm_data[] = {
|
|
{ .name = "dsp", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu", .rstmap = rst_map_012 },
|
|
{ .name = "iva", .base = 0x4ae07200, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
|
|
{ .name = "device", .base = 0x4ae07c00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
|
|
{ },
|
|
};
|
|
|
|
static const struct omap_prm_data dra7_prm_data[] = {
|
|
{ .name = "dsp1", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "ipu", .base = 0x4ae06500, .rstctrl = 0x10, .rstst = 0x14, .clkdm_name = "ipu1", .rstmap = rst_map_012 },
|
|
{ .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu2", .rstmap = rst_map_012 },
|
|
{ .name = "iva", .base = 0x4ae06f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
|
|
{ .name = "dsp2", .base = 0x4ae07b00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "eve1", .base = 0x4ae07b40, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "eve2", .base = 0x4ae07b80, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "eve3", .base = 0x4ae07bc0, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ .name = "eve4", .base = 0x4ae07c00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
|
|
{ },
|
|
};
|
|
|
|
static const struct omap_rst_map am3_per_rst_map[] = {
|
|
{ .rst = 1 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_rst_map am3_wkup_rst_map[] = {
|
|
{ .rst = 3, .st = 5 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_prm_data am3_prm_data[] = {
|
|
{ .name = "per", .base = 0x44e00c00, .rstctrl = 0x0, .rstmap = am3_per_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL, .clkdm_name = "pruss_ocp" },
|
|
{ .name = "wkup", .base = 0x44e00d00, .rstctrl = 0x0, .rstst = 0xc, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
|
|
{ .name = "device", .base = 0x44e00f00, .rstctrl = 0x0, .rstst = 0x8, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
|
|
{ .name = "gfx", .base = 0x44e01100, .rstctrl = 0x4, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" },
|
|
{ },
|
|
};
|
|
|
|
static const struct omap_rst_map am4_per_rst_map[] = {
|
|
{ .rst = 1, .st = 0 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_rst_map am4_device_rst_map[] = {
|
|
{ .rst = 0, .st = 1 },
|
|
{ .rst = 1, .st = 0 },
|
|
{ .rst = -1 },
|
|
};
|
|
|
|
static const struct omap_prm_data am4_prm_data[] = {
|
|
{ .name = "gfx", .base = 0x44df0400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" },
|
|
{ .name = "per", .base = 0x44df0800, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am4_per_rst_map, .clkdm_name = "pruss_ocp" },
|
|
{ .name = "wkup", .base = 0x44df2000, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_NO_CLKDM },
|
|
{ .name = "device", .base = 0x44df4000, .rstctrl = 0x0, .rstst = 0x4, .rstmap = am4_device_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
|
|
{ },
|
|
};
|
|
|
|
static const struct of_device_id omap_prm_id_table[] = {
|
|
{ .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data },
|
|
{ .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data },
|
|
{ .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data },
|
|
{ .compatible = "ti,am3-prm-inst", .data = am3_prm_data },
|
|
{ .compatible = "ti,am4-prm-inst", .data = am4_prm_data },
|
|
{ },
|
|
};
|
|
|
|
static bool _is_valid_reset(struct omap_reset_data *reset, unsigned long id)
|
|
{
|
|
if (reset->mask & BIT(id))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int omap_reset_get_st_bit(struct omap_reset_data *reset,
|
|
unsigned long id)
|
|
{
|
|
const struct omap_rst_map *map = reset->prm->data->rstmap;
|
|
|
|
while (map->rst >= 0) {
|
|
if (map->rst == id)
|
|
return map->st;
|
|
|
|
map++;
|
|
}
|
|
|
|
return id;
|
|
}
|
|
|
|
static int omap_reset_status(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct omap_reset_data *reset = to_omap_reset_data(rcdev);
|
|
u32 v;
|
|
int st_bit = omap_reset_get_st_bit(reset, id);
|
|
bool has_rstst = reset->prm->data->rstst ||
|
|
(reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
|
|
|
|
/* Check if we have rstst */
|
|
if (!has_rstst)
|
|
return -ENOTSUPP;
|
|
|
|
/* Check if hw reset line is asserted */
|
|
v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
|
|
if (v & BIT(id))
|
|
return 1;
|
|
|
|
/*
|
|
* Check reset status, high value means reset sequence has been
|
|
* completed successfully so we can return 0 here (reset deasserted)
|
|
*/
|
|
v = readl_relaxed(reset->prm->base + reset->prm->data->rstst);
|
|
v >>= st_bit;
|
|
v &= 1;
|
|
|
|
return !v;
|
|
}
|
|
|
|
static int omap_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct omap_reset_data *reset = to_omap_reset_data(rcdev);
|
|
u32 v;
|
|
unsigned long flags;
|
|
|
|
/* assert the reset control line */
|
|
spin_lock_irqsave(&reset->lock, flags);
|
|
v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
|
|
v |= 1 << id;
|
|
writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
|
|
spin_unlock_irqrestore(&reset->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct omap_reset_data *reset = to_omap_reset_data(rcdev);
|
|
u32 v;
|
|
int st_bit;
|
|
bool has_rstst;
|
|
unsigned long flags;
|
|
struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev);
|
|
int ret = 0;
|
|
|
|
has_rstst = reset->prm->data->rstst ||
|
|
(reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
|
|
|
|
if (has_rstst) {
|
|
st_bit = omap_reset_get_st_bit(reset, id);
|
|
|
|
/* Clear the reset status by writing 1 to the status bit */
|
|
v = 1 << st_bit;
|
|
writel_relaxed(v, reset->prm->base + reset->prm->data->rstst);
|
|
}
|
|
|
|
if (reset->clkdm)
|
|
pdata->clkdm_deny_idle(reset->clkdm);
|
|
|
|
/* de-assert the reset control line */
|
|
spin_lock_irqsave(&reset->lock, flags);
|
|
v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
|
|
v &= ~(1 << id);
|
|
writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
|
|
spin_unlock_irqrestore(&reset->lock, flags);
|
|
|
|
if (!has_rstst)
|
|
goto exit;
|
|
|
|
/* wait for the status to be set */
|
|
ret = readl_relaxed_poll_timeout(reset->prm->base +
|
|
reset->prm->data->rstst,
|
|
v, v & BIT(st_bit), 1,
|
|
OMAP_RESET_MAX_WAIT);
|
|
if (ret)
|
|
pr_err("%s: timedout waiting for %s:%lu\n", __func__,
|
|
reset->prm->data->name, id);
|
|
|
|
exit:
|
|
if (reset->clkdm)
|
|
pdata->clkdm_allow_idle(reset->clkdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct reset_control_ops omap_reset_ops = {
|
|
.assert = omap_reset_assert,
|
|
.deassert = omap_reset_deassert,
|
|
.status = omap_reset_status,
|
|
};
|
|
|
|
static int omap_prm_reset_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
struct omap_reset_data *reset = to_omap_reset_data(rcdev);
|
|
|
|
if (!_is_valid_reset(reset, reset_spec->args[0]))
|
|
return -EINVAL;
|
|
|
|
return reset_spec->args[0];
|
|
}
|
|
|
|
static int omap_prm_reset_init(struct platform_device *pdev,
|
|
struct omap_prm *prm)
|
|
{
|
|
struct omap_reset_data *reset;
|
|
const struct omap_rst_map *map;
|
|
struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
char buf[32];
|
|
|
|
/*
|
|
* Check if we have controllable resets. If either rstctrl is non-zero
|
|
* or OMAP_PRM_HAS_RSTCTRL flag is set, we have reset control register
|
|
* for the domain.
|
|
*/
|
|
if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL))
|
|
return 0;
|
|
|
|
/* Check if we have the pdata callbacks in place */
|
|
if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle ||
|
|
!pdata->clkdm_allow_idle)
|
|
return -EINVAL;
|
|
|
|
map = prm->data->rstmap;
|
|
if (!map)
|
|
return -EINVAL;
|
|
|
|
reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
|
|
if (!reset)
|
|
return -ENOMEM;
|
|
|
|
reset->rcdev.owner = THIS_MODULE;
|
|
reset->rcdev.ops = &omap_reset_ops;
|
|
reset->rcdev.of_node = pdev->dev.of_node;
|
|
reset->rcdev.nr_resets = OMAP_MAX_RESETS;
|
|
reset->rcdev.of_xlate = omap_prm_reset_xlate;
|
|
reset->rcdev.of_reset_n_cells = 1;
|
|
reset->dev = &pdev->dev;
|
|
spin_lock_init(&reset->lock);
|
|
|
|
reset->prm = prm;
|
|
|
|
sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name :
|
|
prm->data->name);
|
|
|
|
if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) {
|
|
reset->clkdm = pdata->clkdm_lookup(buf);
|
|
if (!reset->clkdm)
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (map->rst >= 0) {
|
|
reset->mask |= BIT(map->rst);
|
|
map++;
|
|
}
|
|
|
|
return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
|
|
}
|
|
|
|
static int omap_prm_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
const struct omap_prm_data *data;
|
|
struct omap_prm *prm;
|
|
const struct of_device_id *match;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
match = of_match_device(omap_prm_id_table, &pdev->dev);
|
|
if (!match)
|
|
return -ENOTSUPP;
|
|
|
|
prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL);
|
|
if (!prm)
|
|
return -ENOMEM;
|
|
|
|
data = match->data;
|
|
|
|
while (data->base != res->start) {
|
|
if (!data->base)
|
|
return -EINVAL;
|
|
data++;
|
|
}
|
|
|
|
prm->data = data;
|
|
|
|
prm->base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(prm->base))
|
|
return PTR_ERR(prm->base);
|
|
|
|
return omap_prm_reset_init(pdev, prm);
|
|
}
|
|
|
|
static struct platform_driver omap_prm_driver = {
|
|
.probe = omap_prm_probe,
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.of_match_table = omap_prm_id_table,
|
|
},
|
|
};
|
|
builtin_platform_driver(omap_prm_driver);
|