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kernel-fxtec-pro1x/drivers/bus/ti-sysc.c
Tony Lindgren 2fe6d9c113 bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated 
[ Upstream commit aaa29bb01cc4bf5a87dbdb219efba3b09f259d8e ]

If we return early before ddata->clocks have been allocated we will get a
NULL pointer dereference in sysc_unprepare(). Let's fix this by returning
early when no clocks are allocated.

Fixes: 0eecc636e5 ("bus: ti-sysc: Add minimal TI sysc interconnect target driver")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-27 14:50:36 +01:00

1871 lines
43 KiB
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/*
* 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/clkdev.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/iopoll.h>
#include <linux/platform_data/ti-sysc.h>
#include <dt-bindings/bus/ti-sysc.h>
#define MAX_MODULE_SOFTRESET_WAIT 10000
static const char * const reg_names[] = { "rev", "sysc", "syss", };
enum sysc_clocks {
SYSC_FCK,
SYSC_ICK,
SYSC_OPTFCK0,
SYSC_OPTFCK1,
SYSC_OPTFCK2,
SYSC_OPTFCK3,
SYSC_OPTFCK4,
SYSC_OPTFCK5,
SYSC_OPTFCK6,
SYSC_OPTFCK7,
SYSC_MAX_CLOCKS,
};
static const char * const clock_names[SYSC_ICK + 1] = { "fck", "ick", };
#define SYSC_IDLEMODE_MASK 3
#define SYSC_CLOCKACTIVITY_MASK 3
/**
* 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
* @clock_roles: clock role names for the found clocks
* @nr_clocks: number of clocks used by the interconnect target module
* @legacy_mode: configured for legacy mode if set
* @cap: interconnect target module capabilities
* @cfg: interconnect target module configuration
* @name: name if available
* @revision: interconnect target module revision
* @needs_resume: runtime resume needed on resume from suspend
*/
struct sysc {
struct device *dev;
u64 module_pa;
u32 module_size;
void __iomem *module_va;
int offsets[SYSC_MAX_REGS];
struct clk **clocks;
const char **clock_roles;
int nr_clocks;
struct reset_control *rsts;
const char *legacy_mode;
const struct sysc_capabilities *cap;
struct sysc_config cfg;
struct ti_sysc_cookie cookie;
const char *name;
u32 revision;
bool enabled;
bool needs_resume;
bool child_needs_resume;
struct delayed_work idle_work;
};
static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
bool is_child);
void sysc_write(struct sysc *ddata, int offset, u32 value)
{
writel_relaxed(value, ddata->module_va + offset);
}
static u32 sysc_read(struct sysc *ddata, int offset)
{
if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
u32 val;
val = readw_relaxed(ddata->module_va + offset);
val |= (readw_relaxed(ddata->module_va + offset + 4) << 16);
return val;
}
return readl_relaxed(ddata->module_va + offset);
}
static bool sysc_opt_clks_needed(struct sysc *ddata)
{
return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
}
static u32 sysc_read_revision(struct sysc *ddata)
{
int offset = ddata->offsets[SYSC_REVISION];
if (offset < 0)
return 0;
return sysc_read(ddata, offset);
}
static int sysc_get_one_clock(struct sysc *ddata, const char *name)
{
int error, i, index = -ENODEV;
if (!strncmp(clock_names[SYSC_FCK], name, 3))
index = SYSC_FCK;
else if (!strncmp(clock_names[SYSC_ICK], name, 3))
index = SYSC_ICK;
if (index < 0) {
for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
if (!ddata->clocks[i]) {
index = i;
break;
}
}
}
if (index < 0) {
dev_err(ddata->dev, "clock %s not added\n", name);
return 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)
{
struct device_node *np = ddata->dev->of_node;
struct property *prop;
const char *name;
int nr_fck = 0, nr_ick = 0, i, error = 0;
ddata->clock_roles = devm_kcalloc(ddata->dev,
SYSC_MAX_CLOCKS,
sizeof(*ddata->clock_roles),
GFP_KERNEL);
if (!ddata->clock_roles)
return -ENOMEM;
of_property_for_each_string(np, "clock-names", prop, name) {
if (!strncmp(clock_names[SYSC_FCK], name, 3))
nr_fck++;
if (!strncmp(clock_names[SYSC_ICK], name, 3))
nr_ick++;
ddata->clock_roles[ddata->nr_clocks] = name;
ddata->nr_clocks++;
}
if (ddata->nr_clocks < 1)
return 0;
if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
dev_err(ddata->dev, "too many clocks for %pOF\n", np);
return -EINVAL;
}
if (nr_fck > 1 || nr_ick > 1) {
dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);
return -EINVAL;
}
ddata->clocks = devm_kcalloc(ddata->dev,
ddata->nr_clocks, sizeof(*ddata->clocks),
GFP_KERNEL);
if (!ddata->clocks)
return -ENOMEM;
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
const char *name = ddata->clock_roles[i];
if (!name)
continue;
error = sysc_get_one_clock(ddata, name);
if (error && error != -ENOENT)
return error;
}
return 0;
}
/**
* sysc_init_resets - reset module on init
* @ddata: device driver data
*
* A module can have both OCP softreset control and external rstctrl.
* If more complicated rstctrl resets are needed, please handle these
* directly from the child device driver and map only the module reset
* for the parent interconnect target module device.
*
* Automatic reset of the module on init can be skipped with the
* "ti,no-reset-on-init" device tree property.
*/
static int sysc_init_resets(struct sysc *ddata)
{
int error;
ddata->rsts =
devm_reset_control_array_get_optional_exclusive(ddata->dev);
if (IS_ERR(ddata->rsts))
return PTR_ERR(ddata->rsts);
if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
goto deassert;
error = reset_control_assert(ddata->rsts);
if (error)
return error;
deassert:
error = reset_control_deassert(ddata->rsts);
if (error)
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);
return 0;
}
static struct device_node *stdout_path;
static void sysc_init_stdout_path(struct sysc *ddata)
{
struct device_node *np = NULL;
const char *uart;
if (IS_ERR(stdout_path))
return;
if (stdout_path)
return;
np = of_find_node_by_path("/chosen");
if (!np)
goto err;
uart = of_get_property(np, "stdout-path", NULL);
if (!uart)
goto err;
np = of_find_node_by_path(uart);
if (!np)
goto err;
stdout_path = np;
return;
err:
stdout_path = ERR_PTR(-ENODEV);
}
static void sysc_check_quirk_stdout(struct sysc *ddata,
struct device_node *np)
{
sysc_init_stdout_path(ddata);
if (np != stdout_path)
return;
ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
SYSC_QUIRK_NO_RESET_ON_INIT;
}
/**
* 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?");
sysc_check_quirk_stdout(ddata, np);
sysc_parse_dts_quirks(ddata, np, true);
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;
}
/*
* So far only I2C uses 16-bit read access with clockactivity with revision
* in two registers with stride of 4. We can detect this based on the rev
* register size to configure things far enough to be able to properly read
* the revision register.
*/
static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
{
if (resource_size(res) == 8)
ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
}
/**
* 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) {
ddata->offsets[reg] = -ENODEV;
return 0;
}
ddata->offsets[reg] = res->start - ddata->module_pa;
if (reg == SYSC_REVISION)
sysc_check_quirk_16bit(ddata, res);
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: device driver data
*
* Note that the interconnect target module registers can be anywhere
* within the interconnect target module range. For example, SGX has
* them at offset 0x1fc00 in the 32MB module address space. And cpsw
* has them at offset 0x1200 in the CPSW_WR child. Usually the
* the interconnect target module registers are at the beginning of
* the module range though.
*/
static int sysc_ioremap(struct sysc *ddata)
{
int size;
size = max3(ddata->offsets[SYSC_REVISION],
ddata->offsets[SYSC_SYSCONFIG],
ddata->offsets[SYSC_SYSSTATUS]);
if (size < 0 || (size + sizeof(u32)) > ddata->module_size)
return -EINVAL;
ddata->module_va = devm_ioremap(ddata->dev,
ddata->module_pa,
size + sizeof(u32));
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 len;
if (ddata->offsets[SYSC_REVISION] < 0)
return sprintf(bufp, ":NA");
len = sprintf(bufp, ":%08x", ddata->revision);
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]);
}
static int sysc_show_name(char *bufp, struct sysc *ddata)
{
if (!ddata->name)
return 0;
return sprintf(bufp, ":%s", ddata->name);
}
/**
* 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);
bufp += sysc_show_name(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 ti_sysc_platform_data *pdata;
struct sysc *ddata;
int error = 0, i;
ddata = dev_get_drvdata(dev);
if (!ddata->enabled)
return 0;
if (ddata->legacy_mode) {
pdata = dev_get_platdata(ddata->dev);
if (!pdata)
return 0;
if (!pdata->idle_module)
return -ENODEV;
error = pdata->idle_module(dev, &ddata->cookie);
if (error)
dev_err(dev, "%s: could not idle: %i\n",
__func__, error);
goto idled;
}
for (i = 0; i < ddata->nr_clocks; i++) {
if (IS_ERR_OR_NULL(ddata->clocks[i]))
continue;
if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
break;
clk_disable(ddata->clocks[i]);
}
idled:
ddata->enabled = false;
return error;
}
static int __maybe_unused sysc_runtime_resume(struct device *dev)
{
struct ti_sysc_platform_data *pdata;
struct sysc *ddata;
int error = 0, i;
ddata = dev_get_drvdata(dev);
if (ddata->enabled)
return 0;
if (ddata->legacy_mode) {
pdata = dev_get_platdata(ddata->dev);
if (!pdata)
return 0;
if (!pdata->enable_module)
return -ENODEV;
error = pdata->enable_module(dev, &ddata->cookie);
if (error)
dev_err(dev, "%s: could not enable: %i\n",
__func__, error);
goto awake;
}
for (i = 0; i < ddata->nr_clocks; i++) {
if (IS_ERR_OR_NULL(ddata->clocks[i]))
continue;
if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
break;
error = clk_enable(ddata->clocks[i]);
if (error)
return error;
}
awake:
ddata->enabled = true;
return error;
}
#ifdef CONFIG_PM_SLEEP
static int sysc_suspend(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
SYSC_QUIRK_LEGACY_IDLE))
return 0;
if (!ddata->enabled)
return 0;
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
error = pm_runtime_put_sync_suspend(dev);
if (error < 0) {
dev_warn(ddata->dev, "%s not idle %i %s\n",
__func__, error,
ddata->name ? ddata->name : "");
return 0;
}
ddata->needs_resume = true;
return 0;
}
static int sysc_resume(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
SYSC_QUIRK_LEGACY_IDLE))
return 0;
if (ddata->needs_resume) {
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
error = pm_runtime_get_sync(dev);
if (error < 0) {
dev_err(ddata->dev, "%s error %i %s\n",
__func__, error,
ddata->name ? ddata->name : "");
return error;
}
ddata->needs_resume = false;
}
return 0;
}
static int sysc_noirq_suspend(struct device *dev)
{
struct sysc *ddata;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
return 0;
if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
return 0;
if (!ddata->enabled)
return 0;
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
ddata->needs_resume = true;
return sysc_runtime_suspend(dev);
}
static int sysc_noirq_resume(struct device *dev)
{
struct sysc *ddata;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
return 0;
if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
return 0;
if (ddata->needs_resume) {
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
ddata->needs_resume = false;
return sysc_runtime_resume(dev);
}
return 0;
}
#endif
static const struct dev_pm_ops sysc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(sysc_suspend, sysc_resume)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
sysc_runtime_resume,
NULL)
};
/* Module revision register based quirks */
struct sysc_revision_quirk {
const char *name;
u32 base;
int rev_offset;
int sysc_offset;
int syss_offset;
u32 revision;
u32 revision_mask;
u32 quirks;
};
#define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss, \
optrev_val, optrevmask, optquirkmask) \
{ \
.name = (optname), \
.base = (optbase), \
.rev_offset = (optrev), \
.sysc_offset = (optsysc), \
.syss_offset = (optsyss), \
.revision = (optrev_val), \
.revision_mask = (optrevmask), \
.quirks = (optquirkmask), \
}
static const struct sysc_revision_quirk sysc_revision_quirks[] = {
/* These need to use noirq_suspend */
SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff,
SYSC_QUIRK_RESOURCE_PROVIDER),
/* These drivers need to be fixed to not use pm_runtime_irq_safe() */
SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff,
0),
/* Some timers on omap4 and later */
SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffffffff,
0),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
/* Uarts on omap4 and later */
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
/* These devices don't yet suspend properly without legacy setting */
SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0d00, 0xffffffff,
SYSC_QUIRK_LEGACY_IDLE),
#ifdef DEBUG
SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, 0),
SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40000902, 0xffffffff, 0),
SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40002903, 0xffffffff, 0),
SYSC_QUIRK("spinlock", 0, 0, 0x10, -1, 0x50020000, 0xffffffff, 0),
SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
0xffffffff, 0),
#endif
};
static void sysc_init_revision_quirks(struct sysc *ddata)
{
const struct sysc_revision_quirk *q;
int i;
for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
q = &sysc_revision_quirks[i];
if (q->base && q->base != ddata->module_pa)
continue;
if (q->rev_offset >= 0 &&
q->rev_offset != ddata->offsets[SYSC_REVISION])
continue;
if (q->sysc_offset >= 0 &&
q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
continue;
if (q->syss_offset >= 0 &&
q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
continue;
if (q->revision == ddata->revision ||
(q->revision & q->revision_mask) ==
(ddata->revision & q->revision_mask)) {
ddata->name = q->name;
ddata->cfg.quirks |= q->quirks;
}
}
}
static int sysc_reset(struct sysc *ddata)
{
int offset = ddata->offsets[SYSC_SYSCONFIG];
int val;
if (ddata->legacy_mode || offset < 0 ||
ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
return 0;
/*
* Currently only support reset status in sysstatus.
* Warn and return error in all other cases
*/
if (!ddata->cfg.syss_mask) {
dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n");
return -EINVAL;
}
val = sysc_read(ddata, offset);
val |= (0x1 << ddata->cap->regbits->srst_shift);
sysc_write(ddata, offset, val);
/* Poll on reset status */
offset = ddata->offsets[SYSC_SYSSTATUS];
return readl_poll_timeout(ddata->module_va + offset, val,
(val & ddata->cfg.syss_mask) == 0x0,
100, MAX_MODULE_SOFTRESET_WAIT);
}
/* At this point the module is configured enough to read the revision */
static int sysc_init_module(struct sysc *ddata)
{
int error;
if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE_ON_INIT) {
ddata->revision = sysc_read_revision(ddata);
goto rev_quirks;
}
error = pm_runtime_get_sync(ddata->dev);
if (error < 0) {
pm_runtime_put_noidle(ddata->dev);
return 0;
}
error = sysc_reset(ddata);
if (error) {
dev_err(ddata->dev, "Reset failed with %d\n", error);
pm_runtime_put_sync(ddata->dev);
return error;
}
ddata->revision = sysc_read_revision(ddata);
pm_runtime_put_sync(ddata->dev);
rev_quirks:
sysc_init_revision_quirks(ddata);
return 0;
}
static int sysc_init_sysc_mask(struct sysc *ddata)
{
struct device_node *np = ddata->dev->of_node;
int error;
u32 val;
error = of_property_read_u32(np, "ti,sysc-mask", &val);
if (error)
return 0;
ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
return 0;
}
static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
const char *name)
{
struct device_node *np = ddata->dev->of_node;
struct property *prop;
const __be32 *p;
u32 val;
of_property_for_each_u32(np, name, prop, p, val) {
if (val >= SYSC_NR_IDLEMODES) {
dev_err(ddata->dev, "invalid idlemode: %i\n", val);
return -EINVAL;
}
*idlemodes |= (1 << val);
}
return 0;
}
static int sysc_init_idlemodes(struct sysc *ddata)
{
int error;
error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
"ti,sysc-midle");
if (error)
return error;
error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
"ti,sysc-sidle");
if (error)
return error;
return 0;
}
/*
* Only some devices on omap4 and later have SYSCONFIG reset done
* bit. We can detect this if there is no SYSSTATUS at all, or the
* SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
* have multiple bits for the child devices like OHCI and EHCI.
* Depends on SYSC being parsed first.
*/
static int sysc_init_syss_mask(struct sysc *ddata)
{
struct device_node *np = ddata->dev->of_node;
int error;
u32 val;
error = of_property_read_u32(np, "ti,syss-mask", &val);
if (error) {
if ((ddata->cap->type == TI_SYSC_OMAP4 ||
ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
(ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
return 0;
}
if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
ddata->cfg.syss_mask = val;
return 0;
}
/*
* Many child device drivers need to have fck and opt clocks available
* to get the clock rate for device internal configuration etc.
*/
static int sysc_child_add_named_clock(struct sysc *ddata,
struct device *child,
const char *name)
{
struct clk *clk;
struct clk_lookup *l;
int error = 0;
if (!name)
return 0;
clk = clk_get(child, name);
if (!IS_ERR(clk)) {
clk_put(clk);
return -EEXIST;
}
clk = clk_get(ddata->dev, name);
if (IS_ERR(clk))
return -ENODEV;
l = clkdev_create(clk, name, dev_name(child));
if (!l)
error = -ENOMEM;
clk_put(clk);
return error;
}
static int sysc_child_add_clocks(struct sysc *ddata,
struct device *child)
{
int i, error;
for (i = 0; i < ddata->nr_clocks; i++) {
error = sysc_child_add_named_clock(ddata,
child,
ddata->clock_roles[i]);
if (error && error != -EEXIST) {
dev_err(ddata->dev, "could not add child clock %s: %i\n",
ddata->clock_roles[i], error);
return error;
}
}
return 0;
}
static struct device_type sysc_device_type = {
};
static struct sysc *sysc_child_to_parent(struct device *dev)
{
struct device *parent = dev->parent;
if (!parent || parent->type != &sysc_device_type)
return NULL;
return dev_get_drvdata(parent);
}
static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = sysc_child_to_parent(dev);
error = pm_generic_runtime_suspend(dev);
if (error)
return error;
if (!ddata->enabled)
return 0;
return sysc_runtime_suspend(ddata->dev);
}
static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = sysc_child_to_parent(dev);
if (!ddata->enabled) {
error = sysc_runtime_resume(ddata->dev);
if (error < 0)
dev_err(ddata->dev,
"%s error: %i\n", __func__, error);
}
return pm_generic_runtime_resume(dev);
}
#ifdef CONFIG_PM_SLEEP
static int sysc_child_suspend_noirq(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = sysc_child_to_parent(dev);
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
error = pm_generic_suspend_noirq(dev);
if (error) {
dev_err(dev, "%s error at %i: %i\n",
__func__, __LINE__, error);
return error;
}
if (!pm_runtime_status_suspended(dev)) {
error = pm_generic_runtime_suspend(dev);
if (error) {
dev_warn(dev, "%s busy at %i: %i\n",
__func__, __LINE__, error);
return 0;
}
error = sysc_runtime_suspend(ddata->dev);
if (error) {
dev_err(dev, "%s error at %i: %i\n",
__func__, __LINE__, error);
return error;
}
ddata->child_needs_resume = true;
}
return 0;
}
static int sysc_child_resume_noirq(struct device *dev)
{
struct sysc *ddata;
int error;
ddata = sysc_child_to_parent(dev);
dev_dbg(ddata->dev, "%s %s\n", __func__,
ddata->name ? ddata->name : "");
if (ddata->child_needs_resume) {
ddata->child_needs_resume = false;
error = sysc_runtime_resume(ddata->dev);
if (error)
dev_err(ddata->dev,
"%s runtime resume error: %i\n",
__func__, error);
error = pm_generic_runtime_resume(dev);
if (error)
dev_err(ddata->dev,
"%s generic runtime resume: %i\n",
__func__, error);
}
return pm_generic_resume_noirq(dev);
}
#endif
struct dev_pm_domain sysc_child_pm_domain = {
.ops = {
SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
sysc_child_runtime_resume,
NULL)
USE_PLATFORM_PM_SLEEP_OPS
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
sysc_child_resume_noirq)
}
};
/**
* sysc_legacy_idle_quirk - handle children in omap_device compatible way
* @ddata: device driver data
* @child: child device driver
*
* Allow idle for child devices as done with _od_runtime_suspend().
* Otherwise many child devices will not idle because of the permanent
* parent usecount set in pm_runtime_irq_safe().
*
* Note that the long term solution is to just modify the child device
* drivers to not set pm_runtime_irq_safe() and then this can be just
* dropped.
*/
static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
{
if (!ddata->legacy_mode)
return;
if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
dev_pm_domain_set(child, &sysc_child_pm_domain);
}
static int sysc_notifier_call(struct notifier_block *nb,
unsigned long event, void *device)
{
struct device *dev = device;
struct sysc *ddata;
int error;
ddata = sysc_child_to_parent(dev);
if (!ddata)
return NOTIFY_DONE;
switch (event) {
case BUS_NOTIFY_ADD_DEVICE:
error = sysc_child_add_clocks(ddata, dev);
if (error)
return error;
sysc_legacy_idle_quirk(ddata, dev);
break;
default:
break;
}
return NOTIFY_DONE;
}
static struct notifier_block sysc_nb = {
.notifier_call = sysc_notifier_call,
};
/* Device tree configured quirks */
struct sysc_dts_quirk {
const char *name;
u32 mask;
};
static const struct sysc_dts_quirk sysc_dts_quirks[] = {
{ .name = "ti,no-idle-on-init",
.mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
{ .name = "ti,no-reset-on-init",
.mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
};
static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
bool is_child)
{
const struct property *prop;
int i, len;
for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
const char *name = sysc_dts_quirks[i].name;
prop = of_get_property(np, name, &len);
if (!prop)
continue;
ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
if (is_child) {
dev_warn(ddata->dev,
"dts flag should be at module level for %s\n",
name);
}
}
}
static int sysc_init_dts_quirks(struct sysc *ddata)
{
struct device_node *np = ddata->dev->of_node;
int error;
u32 val;
ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
sysc_parse_dts_quirks(ddata, np, false);
error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
if (!error) {
if (val > 255) {
dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
val);
}
ddata->cfg.srst_udelay = (u8)val;
}
return 0;
}
static void sysc_unprepare(struct sysc *ddata)
{
int i;
if (!ddata->clocks)
return;
for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
if (!IS_ERR_OR_NULL(ddata->clocks[i]))
clk_unprepare(ddata->clocks[i]);
}
}
/*
* Common sysc register bits found on omap2, also known as type1
*/
static const struct sysc_regbits sysc_regbits_omap2 = {
.dmadisable_shift = -ENODEV,
.midle_shift = 12,
.sidle_shift = 3,
.clkact_shift = 8,
.emufree_shift = 5,
.enwkup_shift = 2,
.srst_shift = 1,
.autoidle_shift = 0,
};
static const struct sysc_capabilities sysc_omap2 = {
.type = TI_SYSC_OMAP2,
.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
SYSC_OMAP2_AUTOIDLE,
.regbits = &sysc_regbits_omap2,
};
/* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
static const struct sysc_capabilities sysc_omap2_timer = {
.type = TI_SYSC_OMAP2_TIMER,
.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
SYSC_OMAP2_AUTOIDLE,
.regbits = &sysc_regbits_omap2,
.mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
};
/*
* SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
* with different sidle position
*/
static const struct sysc_regbits sysc_regbits_omap3_sham = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = 4,
.clkact_shift = -ENODEV,
.enwkup_shift = -ENODEV,
.srst_shift = 1,
.autoidle_shift = 0,
.emufree_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap3_sham = {
.type = TI_SYSC_OMAP3_SHAM,
.sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
.regbits = &sysc_regbits_omap3_sham,
};
/*
* AES register bits found on omap3 and later, a variant of
* sysc_regbits_omap2 with different sidle position
*/
static const struct sysc_regbits sysc_regbits_omap3_aes = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = 6,
.clkact_shift = -ENODEV,
.enwkup_shift = -ENODEV,
.srst_shift = 1,
.autoidle_shift = 0,
.emufree_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap3_aes = {
.type = TI_SYSC_OMAP3_AES,
.sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
.regbits = &sysc_regbits_omap3_aes,
};
/*
* Common sysc register bits found on omap4, also known as type2
*/
static const struct sysc_regbits sysc_regbits_omap4 = {
.dmadisable_shift = 16,
.midle_shift = 4,
.sidle_shift = 2,
.clkact_shift = -ENODEV,
.enwkup_shift = -ENODEV,
.emufree_shift = 1,
.srst_shift = 0,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap4 = {
.type = TI_SYSC_OMAP4,
.sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
SYSC_OMAP4_SOFTRESET,
.regbits = &sysc_regbits_omap4,
};
static const struct sysc_capabilities sysc_omap4_timer = {
.type = TI_SYSC_OMAP4_TIMER,
.sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
SYSC_OMAP4_SOFTRESET,
.regbits = &sysc_regbits_omap4,
};
/*
* Common sysc register bits found on omap4, also known as type3
*/
static const struct sysc_regbits sysc_regbits_omap4_simple = {
.dmadisable_shift = -ENODEV,
.midle_shift = 2,
.sidle_shift = 0,
.clkact_shift = -ENODEV,
.enwkup_shift = -ENODEV,
.srst_shift = -ENODEV,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap4_simple = {
.type = TI_SYSC_OMAP4_SIMPLE,
.regbits = &sysc_regbits_omap4_simple,
};
/*
* SmartReflex sysc found on omap34xx
*/
static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = -ENODEV,
.clkact_shift = 20,
.enwkup_shift = -ENODEV,
.srst_shift = -ENODEV,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_34xx_sr = {
.type = TI_SYSC_OMAP34XX_SR,
.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
.regbits = &sysc_regbits_omap34xx_sr,
.mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
SYSC_QUIRK_LEGACY_IDLE,
};
/*
* SmartReflex sysc found on omap36xx and later
*/
static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = 24,
.clkact_shift = -ENODEV,
.enwkup_shift = 26,
.srst_shift = -ENODEV,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_36xx_sr = {
.type = TI_SYSC_OMAP36XX_SR,
.sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
.regbits = &sysc_regbits_omap36xx_sr,
.mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
};
static const struct sysc_capabilities sysc_omap4_sr = {
.type = TI_SYSC_OMAP4_SR,
.regbits = &sysc_regbits_omap36xx_sr,
.mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
};
/*
* McASP register bits found on omap4 and later
*/
static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = 0,
.clkact_shift = -ENODEV,
.enwkup_shift = -ENODEV,
.srst_shift = -ENODEV,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap4_mcasp = {
.type = TI_SYSC_OMAP4_MCASP,
.regbits = &sysc_regbits_omap4_mcasp,
.mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
};
/*
* McASP found on dra7 and later
*/
static const struct sysc_capabilities sysc_dra7_mcasp = {
.type = TI_SYSC_OMAP4_SIMPLE,
.regbits = &sysc_regbits_omap4_simple,
.mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
};
/*
* FS USB host found on omap4 and later
*/
static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = 24,
.clkact_shift = -ENODEV,
.enwkup_shift = 26,
.srst_shift = -ENODEV,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
.type = TI_SYSC_OMAP4_USB_HOST_FS,
.sysc_mask = SYSC_OMAP2_ENAWAKEUP,
.regbits = &sysc_regbits_omap4_usb_host_fs,
};
static const struct sysc_regbits sysc_regbits_dra7_mcan = {
.dmadisable_shift = -ENODEV,
.midle_shift = -ENODEV,
.sidle_shift = -ENODEV,
.clkact_shift = -ENODEV,
.enwkup_shift = 4,
.srst_shift = 0,
.emufree_shift = -ENODEV,
.autoidle_shift = -ENODEV,
};
static const struct sysc_capabilities sysc_dra7_mcan = {
.type = TI_SYSC_DRA7_MCAN,
.sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
.regbits = &sysc_regbits_dra7_mcan,
};
static int sysc_init_pdata(struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
struct ti_sysc_module_data mdata;
int error = 0;
if (!pdata || !ddata->legacy_mode)
return 0;
mdata.name = ddata->legacy_mode;
mdata.module_pa = ddata->module_pa;
mdata.module_size = ddata->module_size;
mdata.offsets = ddata->offsets;
mdata.nr_offsets = SYSC_MAX_REGS;
mdata.cap = ddata->cap;
mdata.cfg = &ddata->cfg;
if (!pdata->init_module)
return -ENODEV;
error = pdata->init_module(ddata->dev, &mdata, &ddata->cookie);
if (error == -EEXIST)
error = 0;
return error;
}
static int sysc_init_match(struct sysc *ddata)
{
const struct sysc_capabilities *cap;
cap = of_device_get_match_data(ddata->dev);
if (!cap)
return -EINVAL;
ddata->cap = cap;
if (ddata->cap)
ddata->cfg.quirks |= ddata->cap->mod_quirks;
return 0;
}
static void ti_sysc_idle(struct work_struct *work)
{
struct sysc *ddata;
ddata = container_of(work, struct sysc, idle_work.work);
if (pm_runtime_active(ddata->dev))
pm_runtime_put_sync(ddata->dev);
}
static const struct of_device_id sysc_match_table[] = {
{ .compatible = "simple-bus", },
{ /* sentinel */ },
};
static int sysc_probe(struct platform_device *pdev)
{
struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct sysc *ddata;
int error;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
ddata->dev = &pdev->dev;
platform_set_drvdata(pdev, ddata);
error = sysc_init_match(ddata);
if (error)
return error;
error = sysc_init_dts_quirks(ddata);
if (error)
return error;
error = sysc_get_clocks(ddata);
if (error)
return error;
error = sysc_map_and_check_registers(ddata);
if (error)
return error;
error = sysc_init_sysc_mask(ddata);
if (error)
return error;
error = sysc_init_idlemodes(ddata);
if (error)
return error;
error = sysc_init_syss_mask(ddata);
if (error)
return error;
error = sysc_init_pdata(ddata);
if (error)
return error;
error = sysc_init_resets(ddata);
if (error)
goto unprepare;
pm_runtime_enable(ddata->dev);
error = sysc_init_module(ddata);
if (error)
goto unprepare;
error = pm_runtime_get_sync(ddata->dev);
if (error < 0) {
pm_runtime_put_noidle(ddata->dev);
pm_runtime_disable(ddata->dev);
goto unprepare;
}
sysc_show_registers(ddata);
ddata->dev->type = &sysc_device_type;
error = of_platform_populate(ddata->dev->of_node, sysc_match_table,
pdata ? pdata->auxdata : NULL,
ddata->dev);
if (error)
goto err;
INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);
/* At least earlycon won't survive without deferred idle */
if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE_ON_INIT |
SYSC_QUIRK_NO_RESET_ON_INIT)) {
schedule_delayed_work(&ddata->idle_work, 3000);
} else {
pm_runtime_put(&pdev->dev);
}
if (!of_get_available_child_count(ddata->dev->of_node))
reset_control_assert(ddata->rsts);
return 0;
err:
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;
cancel_delayed_work_sync(&ddata->idle_work);
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_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
reset_control_assert(ddata->rsts);
unprepare:
sysc_unprepare(ddata);
return 0;
}
static const struct of_device_id sysc_match[] = {
{ .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
{ .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
{ .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
{ .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
{ .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
{ .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
{ .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
{ .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
{ .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
{ .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
{ .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
{ .compatible = "ti,sysc-dra7-mcasp", .data = &sysc_dra7_mcasp, },
{ .compatible = "ti,sysc-usb-host-fs",
.data = &sysc_omap4_usb_host_fs, },
{ .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
{ },
};
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,
},
};
static int __init sysc_init(void)
{
bus_register_notifier(&platform_bus_type, &sysc_nb);
return platform_driver_register(&sysc_driver);
}
module_init(sysc_init);
static void __exit sysc_exit(void)
{
bus_unregister_notifier(&platform_bus_type, &sysc_nb);
platform_driver_unregister(&sysc_driver);
}
module_exit(sysc_exit);
MODULE_DESCRIPTION("TI sysc interconnect target driver");
MODULE_LICENSE("GPL v2");
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