mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 21:16:39 +07:00
684be5a48f
Looks like we're missing remove() that's needed if a driver instance rebound. Otherwise we will get "Unbalanced pm_runtime_enable!". Signed-off-by: Tony Lindgren <tony@atomide.com>
584 lines
12 KiB
C
584 lines
12 KiB
C
/*
|
|
* ti-sysc.c - Texas Instruments sysc interconnect target driver
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
enum sysc_registers {
|
|
SYSC_REVISION,
|
|
SYSC_SYSCONFIG,
|
|
SYSC_SYSSTATUS,
|
|
SYSC_MAX_REGS,
|
|
};
|
|
|
|
static const char * const reg_names[] = { "rev", "sysc", "syss", };
|
|
|
|
enum sysc_clocks {
|
|
SYSC_FCK,
|
|
SYSC_ICK,
|
|
SYSC_MAX_CLOCKS,
|
|
};
|
|
|
|
static const char * const clock_names[] = { "fck", "ick", };
|
|
|
|
/**
|
|
* struct sysc - TI sysc interconnect target module registers and capabilities
|
|
* @dev: struct device pointer
|
|
* @module_pa: physical address of the interconnect target module
|
|
* @module_size: size of the interconnect target module
|
|
* @module_va: virtual address of the interconnect target module
|
|
* @offsets: register offsets from module base
|
|
* @clocks: clocks used by the interconnect target module
|
|
* @legacy_mode: configured for legacy mode if set
|
|
*/
|
|
struct sysc {
|
|
struct device *dev;
|
|
u64 module_pa;
|
|
u32 module_size;
|
|
void __iomem *module_va;
|
|
int offsets[SYSC_MAX_REGS];
|
|
struct clk *clocks[SYSC_MAX_CLOCKS];
|
|
const char *legacy_mode;
|
|
};
|
|
|
|
static u32 sysc_read_revision(struct sysc *ddata)
|
|
{
|
|
return readl_relaxed(ddata->module_va +
|
|
ddata->offsets[SYSC_REVISION]);
|
|
}
|
|
|
|
static int sysc_get_one_clock(struct sysc *ddata,
|
|
enum sysc_clocks index)
|
|
{
|
|
const char *name;
|
|
int error;
|
|
|
|
switch (index) {
|
|
case SYSC_FCK:
|
|
break;
|
|
case SYSC_ICK:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
name = clock_names[index];
|
|
|
|
ddata->clocks[index] = devm_clk_get(ddata->dev, name);
|
|
if (IS_ERR(ddata->clocks[index])) {
|
|
if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
|
|
return 0;
|
|
|
|
dev_err(ddata->dev, "clock get error for %s: %li\n",
|
|
name, PTR_ERR(ddata->clocks[index]));
|
|
|
|
return PTR_ERR(ddata->clocks[index]);
|
|
}
|
|
|
|
error = clk_prepare(ddata->clocks[index]);
|
|
if (error) {
|
|
dev_err(ddata->dev, "clock prepare error for %s: %i\n",
|
|
name, error);
|
|
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sysc_get_clocks(struct sysc *ddata)
|
|
{
|
|
int i, error;
|
|
|
|
if (ddata->legacy_mode)
|
|
return 0;
|
|
|
|
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
|
|
error = sysc_get_one_clock(ddata, i);
|
|
if (error && error != -ENOENT)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_parse_and_check_child_range - parses module IO region from ranges
|
|
* @ddata: device driver data
|
|
*
|
|
* In general we only need rev, syss, and sysc registers and not the whole
|
|
* module range. But we do want the offsets for these registers from the
|
|
* module base. This allows us to check them against the legacy hwmod
|
|
* platform data. Let's also check the ranges are configured properly.
|
|
*/
|
|
static int sysc_parse_and_check_child_range(struct sysc *ddata)
|
|
{
|
|
struct device_node *np = ddata->dev->of_node;
|
|
const __be32 *ranges;
|
|
u32 nr_addr, nr_size;
|
|
int len, error;
|
|
|
|
ranges = of_get_property(np, "ranges", &len);
|
|
if (!ranges) {
|
|
dev_err(ddata->dev, "missing ranges for %pOF\n", np);
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
len /= sizeof(*ranges);
|
|
|
|
if (len < 3) {
|
|
dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
error = of_property_read_u32(np, "#address-cells", &nr_addr);
|
|
if (error)
|
|
return -ENOENT;
|
|
|
|
error = of_property_read_u32(np, "#size-cells", &nr_size);
|
|
if (error)
|
|
return -ENOENT;
|
|
|
|
if (nr_addr != 1 || nr_size != 1) {
|
|
dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
ranges++;
|
|
ddata->module_pa = of_translate_address(np, ranges++);
|
|
ddata->module_size = be32_to_cpup(ranges);
|
|
|
|
dev_dbg(ddata->dev, "interconnect target 0x%llx size 0x%x for %pOF\n",
|
|
ddata->module_pa, ddata->module_size, np);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_check_one_child - check child configuration
|
|
* @ddata: device driver data
|
|
* @np: child device node
|
|
*
|
|
* Let's avoid messy situations where we have new interconnect target
|
|
* node but children have "ti,hwmods". These belong to the interconnect
|
|
* target node and are managed by this driver.
|
|
*/
|
|
static int sysc_check_one_child(struct sysc *ddata,
|
|
struct device_node *np)
|
|
{
|
|
const char *name;
|
|
|
|
name = of_get_property(np, "ti,hwmods", NULL);
|
|
if (name)
|
|
dev_warn(ddata->dev, "really a child ti,hwmods property?");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sysc_check_children(struct sysc *ddata)
|
|
{
|
|
struct device_node *child;
|
|
int error;
|
|
|
|
for_each_child_of_node(ddata->dev->of_node, child) {
|
|
error = sysc_check_one_child(ddata, child);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_parse_one - parses the interconnect target module registers
|
|
* @ddata: device driver data
|
|
* @reg: register to parse
|
|
*/
|
|
static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
|
|
{
|
|
struct resource *res;
|
|
const char *name;
|
|
|
|
switch (reg) {
|
|
case SYSC_REVISION:
|
|
case SYSC_SYSCONFIG:
|
|
case SYSC_SYSSTATUS:
|
|
name = reg_names[reg];
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
res = platform_get_resource_byname(to_platform_device(ddata->dev),
|
|
IORESOURCE_MEM, name);
|
|
if (!res) {
|
|
dev_dbg(ddata->dev, "has no %s register\n", name);
|
|
ddata->offsets[reg] = -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
ddata->offsets[reg] = res->start - ddata->module_pa;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sysc_parse_registers(struct sysc *ddata)
|
|
{
|
|
int i, error;
|
|
|
|
for (i = 0; i < SYSC_MAX_REGS; i++) {
|
|
error = sysc_parse_one(ddata, i);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_check_registers - check for misconfigured register overlaps
|
|
* @ddata: device driver data
|
|
*/
|
|
static int sysc_check_registers(struct sysc *ddata)
|
|
{
|
|
int i, j, nr_regs = 0, nr_matches = 0;
|
|
|
|
for (i = 0; i < SYSC_MAX_REGS; i++) {
|
|
if (ddata->offsets[i] < 0)
|
|
continue;
|
|
|
|
if (ddata->offsets[i] > (ddata->module_size - 4)) {
|
|
dev_err(ddata->dev, "register outside module range");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (j = 0; j < SYSC_MAX_REGS; j++) {
|
|
if (ddata->offsets[j] < 0)
|
|
continue;
|
|
|
|
if (ddata->offsets[i] == ddata->offsets[j])
|
|
nr_matches++;
|
|
}
|
|
nr_regs++;
|
|
}
|
|
|
|
if (nr_regs < 1) {
|
|
dev_err(ddata->dev, "missing registers\n");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nr_matches > nr_regs) {
|
|
dev_err(ddata->dev, "overlapping registers: (%i/%i)",
|
|
nr_regs, nr_matches);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* syc_ioremap - ioremap register space for the interconnect target module
|
|
* @ddata: deviec driver data
|
|
*
|
|
* Note that the interconnect target module registers can be anywhere
|
|
* within the first child device address space. For example, SGX has
|
|
* them at offset 0x1fc00 in the 32MB module address space. We just
|
|
* what we need around the interconnect target module registers.
|
|
*/
|
|
static int sysc_ioremap(struct sysc *ddata)
|
|
{
|
|
u32 size = 0;
|
|
|
|
if (ddata->offsets[SYSC_SYSSTATUS] >= 0)
|
|
size = ddata->offsets[SYSC_SYSSTATUS];
|
|
else if (ddata->offsets[SYSC_SYSCONFIG] >= 0)
|
|
size = ddata->offsets[SYSC_SYSCONFIG];
|
|
else if (ddata->offsets[SYSC_REVISION] >= 0)
|
|
size = ddata->offsets[SYSC_REVISION];
|
|
else
|
|
return -EINVAL;
|
|
|
|
size &= 0xfff00;
|
|
size += SZ_256;
|
|
|
|
ddata->module_va = devm_ioremap(ddata->dev,
|
|
ddata->module_pa,
|
|
size);
|
|
if (!ddata->module_va)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_map_and_check_registers - ioremap and check device registers
|
|
* @ddata: device driver data
|
|
*/
|
|
static int sysc_map_and_check_registers(struct sysc *ddata)
|
|
{
|
|
int error;
|
|
|
|
error = sysc_parse_and_check_child_range(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysc_check_children(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysc_parse_registers(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysc_ioremap(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysc_check_registers(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sysc_show_rev - read and show interconnect target module revision
|
|
* @bufp: buffer to print the information to
|
|
* @ddata: device driver data
|
|
*/
|
|
static int sysc_show_rev(char *bufp, struct sysc *ddata)
|
|
{
|
|
int error, len;
|
|
|
|
if (ddata->offsets[SYSC_REVISION] < 0)
|
|
return sprintf(bufp, ":NA");
|
|
|
|
error = pm_runtime_get_sync(ddata->dev);
|
|
if (error < 0) {
|
|
pm_runtime_put_noidle(ddata->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
len = sprintf(bufp, ":%08x", sysc_read_revision(ddata));
|
|
|
|
pm_runtime_mark_last_busy(ddata->dev);
|
|
pm_runtime_put_autosuspend(ddata->dev);
|
|
|
|
return len;
|
|
}
|
|
|
|
static int sysc_show_reg(struct sysc *ddata,
|
|
char *bufp, enum sysc_registers reg)
|
|
{
|
|
if (ddata->offsets[reg] < 0)
|
|
return sprintf(bufp, ":NA");
|
|
|
|
return sprintf(bufp, ":%x", ddata->offsets[reg]);
|
|
}
|
|
|
|
/**
|
|
* sysc_show_registers - show information about interconnect target module
|
|
* @ddata: device driver data
|
|
*/
|
|
static void sysc_show_registers(struct sysc *ddata)
|
|
{
|
|
char buf[128];
|
|
char *bufp = buf;
|
|
int i;
|
|
|
|
for (i = 0; i < SYSC_MAX_REGS; i++)
|
|
bufp += sysc_show_reg(ddata, bufp, i);
|
|
|
|
bufp += sysc_show_rev(bufp, ddata);
|
|
|
|
dev_dbg(ddata->dev, "%llx:%x%s\n",
|
|
ddata->module_pa, ddata->module_size,
|
|
buf);
|
|
}
|
|
|
|
static int __maybe_unused sysc_runtime_suspend(struct device *dev)
|
|
{
|
|
struct sysc *ddata;
|
|
int i;
|
|
|
|
ddata = dev_get_drvdata(dev);
|
|
|
|
if (ddata->legacy_mode)
|
|
return 0;
|
|
|
|
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
|
|
if (IS_ERR_OR_NULL(ddata->clocks[i]))
|
|
continue;
|
|
clk_disable(ddata->clocks[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused sysc_runtime_resume(struct device *dev)
|
|
{
|
|
struct sysc *ddata;
|
|
int i, error;
|
|
|
|
ddata = dev_get_drvdata(dev);
|
|
|
|
if (ddata->legacy_mode)
|
|
return 0;
|
|
|
|
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
|
|
if (IS_ERR_OR_NULL(ddata->clocks[i]))
|
|
continue;
|
|
error = clk_enable(ddata->clocks[i]);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops sysc_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
|
|
sysc_runtime_resume,
|
|
NULL)
|
|
};
|
|
|
|
static void sysc_unprepare(struct sysc *ddata)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
|
|
if (!IS_ERR_OR_NULL(ddata->clocks[i]))
|
|
clk_unprepare(ddata->clocks[i]);
|
|
}
|
|
}
|
|
|
|
static int sysc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct sysc *ddata;
|
|
int error;
|
|
|
|
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
|
|
if (!ddata)
|
|
return -ENOMEM;
|
|
|
|
ddata->dev = &pdev->dev;
|
|
ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
|
|
|
|
error = sysc_get_clocks(ddata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysc_map_and_check_registers(ddata);
|
|
if (error)
|
|
goto unprepare;
|
|
|
|
platform_set_drvdata(pdev, ddata);
|
|
|
|
pm_runtime_enable(ddata->dev);
|
|
error = pm_runtime_get_sync(ddata->dev);
|
|
if (error < 0) {
|
|
pm_runtime_put_noidle(ddata->dev);
|
|
pm_runtime_disable(ddata->dev);
|
|
goto unprepare;
|
|
}
|
|
|
|
pm_runtime_use_autosuspend(ddata->dev);
|
|
|
|
sysc_show_registers(ddata);
|
|
|
|
error = of_platform_populate(ddata->dev->of_node,
|
|
NULL, NULL, ddata->dev);
|
|
if (error)
|
|
goto err;
|
|
|
|
pm_runtime_mark_last_busy(ddata->dev);
|
|
pm_runtime_put_autosuspend(ddata->dev);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
pm_runtime_dont_use_autosuspend(&pdev->dev);
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
unprepare:
|
|
sysc_unprepare(ddata);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int sysc_remove(struct platform_device *pdev)
|
|
{
|
|
struct sysc *ddata = platform_get_drvdata(pdev);
|
|
int error;
|
|
|
|
error = pm_runtime_get_sync(ddata->dev);
|
|
if (error < 0) {
|
|
pm_runtime_put_noidle(ddata->dev);
|
|
pm_runtime_disable(ddata->dev);
|
|
goto unprepare;
|
|
}
|
|
|
|
of_platform_depopulate(&pdev->dev);
|
|
|
|
pm_runtime_dont_use_autosuspend(&pdev->dev);
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
unprepare:
|
|
sysc_unprepare(ddata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sysc_match[] = {
|
|
{ .compatible = "ti,sysc-omap2" },
|
|
{ .compatible = "ti,sysc-omap4" },
|
|
{ .compatible = "ti,sysc-omap4-simple" },
|
|
{ .compatible = "ti,sysc-omap3430-sr" },
|
|
{ .compatible = "ti,sysc-omap3630-sr" },
|
|
{ .compatible = "ti,sysc-omap4-sr" },
|
|
{ .compatible = "ti,sysc-omap3-sham" },
|
|
{ .compatible = "ti,sysc-omap-aes" },
|
|
{ .compatible = "ti,sysc-mcasp" },
|
|
{ .compatible = "ti,sysc-usb-host-fs" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sysc_match);
|
|
|
|
static struct platform_driver sysc_driver = {
|
|
.probe = sysc_probe,
|
|
.remove = sysc_remove,
|
|
.driver = {
|
|
.name = "ti-sysc",
|
|
.of_match_table = sysc_match,
|
|
.pm = &sysc_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(sysc_driver);
|
|
|
|
MODULE_DESCRIPTION("TI sysc interconnect target driver");
|
|
MODULE_LICENSE("GPL v2");
|