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linux/drivers/bus/ti-sysc.c
Tony Lindgren 4e23be473e bus: ti-sysc: Add support for module specific reset quirks 
Some older interconnect target modules need module internal clock
toggling quirks to reset properly. We've been doing this in the
platform code earlier, but need to be able to it directly in the
ti-sysc driver when we no longer rely on on the platform code.

Let's add reset handling for 1-wire, i2c and watchdog. Later on
we can add more modules like msdi and dss as they get tested.
For dra7 pcie, we should be able to just use the rstctrl reset
driver when available.

Signed-off-by: Tony Lindgren <tony@atomide.com>
2019-06-10 04:52:22 -07:00

2538 lines
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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_MAX_CLOCKS] = {
"fck", "ick", "opt0", "opt1", "opt2", "opt3", "opt4",
"opt5", "opt6", "opt7",
};
#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
* @clk_enable_quirk: module specific clock enable quirk
* @clk_disable_quirk: module specific clock disable quirk
* @reset_done_quirk: module specific reset done quirk
*/
struct sysc {
struct device *dev;
u64 module_pa;
u32 module_size;
void __iomem *module_va;
int offsets[SYSC_MAX_REGS];
struct ti_sysc_module_data *mdata;
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;
unsigned int enabled:1;
unsigned int needs_resume:1;
unsigned int child_needs_resume:1;
unsigned int disable_on_idle:1;
struct delayed_work idle_work;
void (*clk_enable_quirk)(struct sysc *sysc);
void (*clk_disable_quirk)(struct sysc *sysc);
void (*reset_done_quirk)(struct sysc *sysc);
};
static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
bool is_child);
static void sysc_write(struct sysc *ddata, int offset, u32 value)
{
if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
writew_relaxed(value & 0xffff, ddata->module_va + offset);
/* Only i2c revision has LO and HI register with stride of 4 */
if (ddata->offsets[SYSC_REVISION] >= 0 &&
offset == ddata->offsets[SYSC_REVISION]) {
u16 hi = value >> 16;
writew_relaxed(hi, ddata->module_va + offset + 4);
}
return;
}
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);
/* Only i2c revision has LO and HI register with stride of 4 */
if (ddata->offsets[SYSC_REVISION] >= 0 &&
offset == ddata->offsets[SYSC_REVISION]) {
u16 tmp = readw_relaxed(ddata->module_va + offset + 4);
val |= tmp << 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 u32 sysc_read_sysconfig(struct sysc *ddata)
{
int offset = ddata->offsets[SYSC_SYSCONFIG];
if (offset < 0)
return 0;
return sysc_read(ddata, offset);
}
static u32 sysc_read_sysstatus(struct sysc *ddata)
{
int offset = ddata->offsets[SYSC_SYSSTATUS];
if (offset < 0)
return 0;
return sysc_read(ddata, offset);
}
static int sysc_add_named_clock_from_child(struct sysc *ddata,
const char *name,
const char *optfck_name)
{
struct device_node *np = ddata->dev->of_node;
struct device_node *child;
struct clk_lookup *cl;
struct clk *clock;
const char *n;
if (name)
n = name;
else
n = optfck_name;
/* Does the clock alias already exist? */
clock = of_clk_get_by_name(np, n);
if (!IS_ERR(clock)) {
clk_put(clock);
return 0;
}
child = of_get_next_available_child(np, NULL);
if (!child)
return -ENODEV;
clock = devm_get_clk_from_child(ddata->dev, child, name);
if (IS_ERR(clock))
return PTR_ERR(clock);
/*
* Use clkdev_add() instead of clkdev_alloc() to avoid the MAX_DEV_ID
* limit for clk_get(). If cl ever needs to be freed, it should be done
* with clkdev_drop().
*/
cl = kcalloc(1, sizeof(*cl), GFP_KERNEL);
if (!cl)
return -ENOMEM;
cl->con_id = n;
cl->dev_id = dev_name(ddata->dev);
cl->clk = clock;
clkdev_add(cl);
clk_put(clock);
return 0;
}
static int sysc_init_ext_opt_clock(struct sysc *ddata, const char *name)
{
const char *optfck_name;
int error, index;
if (ddata->nr_clocks < SYSC_OPTFCK0)
index = SYSC_OPTFCK0;
else
index = ddata->nr_clocks;
if (name)
optfck_name = name;
else
optfck_name = clock_names[index];
error = sysc_add_named_clock_from_child(ddata, name, optfck_name);
if (error)
return error;
ddata->clock_roles[index] = optfck_name;
ddata->nr_clocks++;
return 0;
}
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->cfg.quirks & SYSC_QUIRK_EXT_OPT_CLOCK)) {
error = sysc_init_ext_opt_clock(ddata, NULL);
if (error)
return error;
}
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;
}
static int sysc_enable_main_clocks(struct sysc *ddata)
{
struct clk *clock;
int i, error;
if (!ddata->clocks)
return 0;
for (i = 0; i < SYSC_OPTFCK0; i++) {
clock = ddata->clocks[i];
/* Main clocks may not have ick */
if (IS_ERR_OR_NULL(clock))
continue;
error = clk_enable(clock);
if (error)
goto err_disable;
}
return 0;
err_disable:
for (i--; i >= 0; i--) {
clock = ddata->clocks[i];
/* Main clocks may not have ick */
if (IS_ERR_OR_NULL(clock))
continue;
clk_disable(clock);
}
return error;
}
static void sysc_disable_main_clocks(struct sysc *ddata)
{
struct clk *clock;
int i;
if (!ddata->clocks)
return;
for (i = 0; i < SYSC_OPTFCK0; i++) {
clock = ddata->clocks[i];
if (IS_ERR_OR_NULL(clock))
continue;
clk_disable(clock);
}
}
static int sysc_enable_opt_clocks(struct sysc *ddata)
{
struct clk *clock;
int i, error;
if (!ddata->clocks)
return 0;
for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
clock = ddata->clocks[i];
/* Assume no holes for opt clocks */
if (IS_ERR_OR_NULL(clock))
return 0;
error = clk_enable(clock);
if (error)
goto err_disable;
}
return 0;
err_disable:
for (i--; i >= 0; i--) {
clock = ddata->clocks[i];
if (IS_ERR_OR_NULL(clock))
continue;
clk_disable(clock);
}
return error;
}
static void sysc_disable_opt_clocks(struct sysc *ddata)
{
struct clk *clock;
int i;
if (!ddata->clocks)
return;
for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
clock = ddata->clocks[i];
/* Assume no holes for opt clocks */
if (IS_ERR_OR_NULL(clock))
return;
clk_disable(clock);
}
}
static void sysc_clkdm_deny_idle(struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata;
if (ddata->legacy_mode)
return;
pdata = dev_get_platdata(ddata->dev);
if (pdata && pdata->clkdm_deny_idle)
pdata->clkdm_deny_idle(ddata->dev, &ddata->cookie);
}
static void sysc_clkdm_allow_idle(struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata;
if (ddata->legacy_mode)
return;
pdata = dev_get_platdata(ddata->dev);
if (pdata && pdata->clkdm_allow_idle)
pdata->clkdm_allow_idle(ddata->dev, &ddata->cookie);
}
/**
* sysc_init_resets - init rstctrl reset line if configured
* @ddata: device driver data
*
* See sysc_rstctrl_reset_deassert().
*/
static int sysc_init_resets(struct sysc *ddata)
{
ddata->rsts =
devm_reset_control_get_optional(ddata->dev, "rstctrl");
if (IS_ERR(ddata->rsts))
return PTR_ERR(ddata->rsts);
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_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;
if (ddata->offsets[SYSC_REVISION] < 0 &&
ddata->offsets[SYSC_SYSCONFIG] < 0 &&
ddata->offsets[SYSC_SYSSTATUS] < 0) {
size = ddata->module_size;
} else {
size = max3(ddata->offsets[SYSC_REVISION],
ddata->offsets[SYSC_SYSCONFIG],
ddata->offsets[SYSC_SYSSTATUS]);
if (size < SZ_1K)
size = SZ_1K;
if ((size + sizeof(u32)) > ddata->module_size)
size = ddata->module_size;
}
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);
}
#define SYSC_IDLE_MASK (SYSC_NR_IDLEMODES - 1)
#define SYSC_CLOCACT_ICK 2
/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
static int sysc_enable_module(struct device *dev)
{
struct sysc *ddata;
const struct sysc_regbits *regbits;
u32 reg, idlemodes, best_mode;
ddata = dev_get_drvdata(dev);
if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
return 0;
regbits = ddata->cap->regbits;
reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
/* Set CLOCKACTIVITY, we only use it for ick */
if (regbits->clkact_shift >= 0 &&
(ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT ||
ddata->cfg.sysc_val & BIT(regbits->clkact_shift)))
reg |= SYSC_CLOCACT_ICK << regbits->clkact_shift;
/* Set SIDLE mode */
idlemodes = ddata->cfg.sidlemodes;
if (!idlemodes || regbits->sidle_shift < 0)
goto set_midle;
if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE |
SYSC_QUIRK_SWSUP_SIDLE_ACT)) {
best_mode = SYSC_IDLE_NO;
} else {
best_mode = fls(ddata->cfg.sidlemodes) - 1;
if (best_mode > SYSC_IDLE_MASK) {
dev_err(dev, "%s: invalid sidlemode\n", __func__);
return -EINVAL;
}
/* Set WAKEUP */
if (regbits->enwkup_shift >= 0 &&
ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
reg |= BIT(regbits->enwkup_shift);
}
reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
reg |= best_mode << regbits->sidle_shift;
sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
set_midle:
/* Set MIDLE mode */
idlemodes = ddata->cfg.midlemodes;
if (!idlemodes || regbits->midle_shift < 0)
goto set_autoidle;
best_mode = fls(ddata->cfg.midlemodes) - 1;
if (best_mode > SYSC_IDLE_MASK) {
dev_err(dev, "%s: invalid midlemode\n", __func__);
return -EINVAL;
}
reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
reg |= best_mode << regbits->midle_shift;
sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
set_autoidle:
/* Autoidle bit must enabled separately if available */
if (regbits->autoidle_shift >= 0 &&
ddata->cfg.sysc_val & BIT(regbits->autoidle_shift)) {
reg |= 1 << regbits->autoidle_shift;
sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
}
return 0;
}
static int sysc_best_idle_mode(u32 idlemodes, u32 *best_mode)
{
if (idlemodes & BIT(SYSC_IDLE_SMART_WKUP))
*best_mode = SYSC_IDLE_SMART_WKUP;
else if (idlemodes & BIT(SYSC_IDLE_SMART))
*best_mode = SYSC_IDLE_SMART;
else if (idlemodes & SYSC_IDLE_FORCE)
*best_mode = SYSC_IDLE_FORCE;
else
return -EINVAL;
return 0;
}
/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
static int sysc_disable_module(struct device *dev)
{
struct sysc *ddata;
const struct sysc_regbits *regbits;
u32 reg, idlemodes, best_mode;
int ret;
ddata = dev_get_drvdata(dev);
if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
return 0;
regbits = ddata->cap->regbits;
reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
/* Set MIDLE mode */
idlemodes = ddata->cfg.midlemodes;
if (!idlemodes || regbits->midle_shift < 0)
goto set_sidle;
ret = sysc_best_idle_mode(idlemodes, &best_mode);
if (ret) {
dev_err(dev, "%s: invalid midlemode\n", __func__);
return ret;
}
reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
reg |= best_mode << regbits->midle_shift;
sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
set_sidle:
/* Set SIDLE mode */
idlemodes = ddata->cfg.sidlemodes;
if (!idlemodes || regbits->sidle_shift < 0)
return 0;
if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) {
best_mode = SYSC_IDLE_FORCE;
} else {
ret = sysc_best_idle_mode(idlemodes, &best_mode);
if (ret) {
dev_err(dev, "%s: invalid sidlemode\n", __func__);
return ret;
}
}
reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
reg |= best_mode << regbits->sidle_shift;
if (regbits->autoidle_shift >= 0 &&
ddata->cfg.sysc_val & BIT(regbits->autoidle_shift))
reg |= 1 << regbits->autoidle_shift;
sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
return 0;
}
static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev,
struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata;
int error;
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);
if (ddata->disable_on_idle)
reset_control_assert(ddata->rsts);
return 0;
}
static int __maybe_unused sysc_runtime_resume_legacy(struct device *dev,
struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata;
int error;
if (ddata->disable_on_idle)
reset_control_deassert(ddata->rsts);
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);
return 0;
}
static int __maybe_unused sysc_runtime_suspend(struct device *dev)
{
struct sysc *ddata;
int error = 0;
ddata = dev_get_drvdata(dev);
if (!ddata->enabled)
return 0;
sysc_clkdm_deny_idle(ddata);
if (ddata->legacy_mode) {
error = sysc_runtime_suspend_legacy(dev, ddata);
if (error)
goto err_allow_idle;
} else {
error = sysc_disable_module(dev);
if (error)
goto err_allow_idle;
}
sysc_disable_main_clocks(ddata);
if (sysc_opt_clks_needed(ddata))
sysc_disable_opt_clocks(ddata);
ddata->enabled = false;
err_allow_idle:
sysc_clkdm_allow_idle(ddata);
if (ddata->disable_on_idle)
reset_control_assert(ddata->rsts);
return error;
}
static int __maybe_unused sysc_runtime_resume(struct device *dev)
{
struct sysc *ddata;
int error = 0;
ddata = dev_get_drvdata(dev);
if (ddata->enabled)
return 0;
if (ddata->disable_on_idle)
reset_control_deassert(ddata->rsts);
sysc_clkdm_deny_idle(ddata);
if (sysc_opt_clks_needed(ddata)) {
error = sysc_enable_opt_clocks(ddata);
if (error)
goto err_allow_idle;
}
error = sysc_enable_main_clocks(ddata);
if (error)
goto err_opt_clocks;
if (ddata->legacy_mode) {
error = sysc_runtime_resume_legacy(dev, ddata);
if (error)
goto err_main_clocks;
} else {
error = sysc_enable_module(dev);
if (error)
goto err_main_clocks;
}
ddata->enabled = true;
sysc_clkdm_allow_idle(ddata);
return 0;
err_main_clocks:
sysc_disable_main_clocks(ddata);
err_opt_clocks:
if (sysc_opt_clks_needed(ddata))
sysc_disable_opt_clocks(ddata);
err_allow_idle:
sysc_clkdm_allow_idle(ddata);
return error;
}
static int __maybe_unused sysc_noirq_suspend(struct device *dev)
{
struct sysc *ddata;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
return 0;
return pm_runtime_force_suspend(dev);
}
static int __maybe_unused sysc_noirq_resume(struct device *dev)
{
struct sysc *ddata;
ddata = dev_get_drvdata(dev);
if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
return 0;
return pm_runtime_force_resume(dev);
}
static const struct dev_pm_ops sysc_pm_ops = {
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 drivers need to be fixed to not use pm_runtime_irq_safe() */
SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
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, 0x50002100, 0xffffffff,
0),
SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffff00ff,
0),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
/* Uarts on omap4 and later */
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
/* Quirks that need to be set based on the module address */
SYSC_QUIRK("mcpdm", 0x40132000, 0, 0x10, -1, 0x50000800, 0xffffffff,
SYSC_QUIRK_EXT_OPT_CLOCK | SYSC_QUIRK_NO_RESET_ON_INIT |
SYSC_QUIRK_SWSUP_SIDLE),
/* Quirks that need to be set based on detected module */
SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff,
SYSC_MODULE_QUIRK_HDQ1W),
SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff,
SYSC_MODULE_QUIRK_HDQ1W),
SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff,
SYSC_MODULE_QUIRK_I2C),
SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff,
SYSC_MODULE_QUIRK_I2C),
SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff,
SYSC_MODULE_QUIRK_I2C),
SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0,
SYSC_MODULE_QUIRK_I2C),
SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
SYSC_MODULE_QUIRK_WDT),
#ifdef DEBUG
SYSC_QUIRK("adc", 0, 0, 0x10, -1, 0x47300001, 0xffffffff, 0),
SYSC_QUIRK("atl", 0, 0, -1, -1, 0x0a070100, 0xffffffff, 0),
SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
SYSC_QUIRK("cm", 0, 0, -1, -1, 0x40000301, 0xffffffff, 0),
SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
0xffff00f0, 0),
SYSC_QUIRK("dcan", 0, 0, -1, -1, 0xffffffff, 0xffffffff, 0),
SYSC_QUIRK("dmic", 0, 0, 0x10, -1, 0x50010000, 0xffffffff, 0),
SYSC_QUIRK("dwc3", 0, 0, 0x10, -1, 0x500a0200, 0xffffffff, 0),
SYSC_QUIRK("epwmss", 0, 0, 0x4, -1, 0x47400001, 0xffffffff, 0),
SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
SYSC_QUIRK("lcdc", 0, 0, 0x54, -1, 0x4f201000, 0xffffffff, 0),
SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44307b02, 0xffffffff, 0),
SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffff00ff, 0),
SYSC_QUIRK("mcspi", 0, 0, 0x110, 0x114, 0x40300a0b, 0xffffffff, 0),
SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
SYSC_QUIRK("m3", 0, 0, -1, -1, 0x5f580105, 0x0fff0f00, 0),
SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xfffffff0, 0),
SYSC_QUIRK("ocp2scp", 0, 0, -1, -1, 0x50060007, 0xffffffff, 0),
SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff, 0),
SYSC_QUIRK("padconf", 0, 0, -1, -1, 0x40001100, 0xffffffff, 0),
SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff, 0),
SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x00004102, 0xffffffff, 0),
SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000400, 0xffffffff, 0),
SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4e8b0100, 0xffffffff, 0),
SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4f000100, 0xffffffff, 0),
SYSC_QUIRK("scm", 0, 0, -1, -1, 0x40000900, 0xffffffff, 0),
SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff, 0),
SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffff0ff0, 0),
SYSC_QUIRK("sdio", 0, 0x2fc, 0x110, 0x114, 0x31010000, 0xffffffff, 0),
SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 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("rng", 0, 0x1fe0, 0x1fe4, -1, 0x00000020, 0xffffffff, 0),
SYSC_QUIRK("rtc", 0, 0x74, 0x78, -1, 0x4eb01908, 0xffff00f0, 0),
SYSC_QUIRK("timer32k", 0, 0, 0x4, -1, 0x00000060, 0xffffffff, 0),
SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000008, 0xffffffff, 0),
SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -1, 0x50700101, 0xffffffff, 0),
SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
0xffffffff, 0),
SYSC_QUIRK("vfpe", 0, 0, 0x104, -1, 0x4d001200, 0xffffffff, 0),
#endif
};
/*
* Early quirks based on module base and register offsets only that are
* needed before the module revision can be read
*/
static void sysc_init_early_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)
continue;
if (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;
ddata->name = q->name;
ddata->cfg.quirks |= q->quirks;
}
}
/* Quirks that also consider the revision register value */
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;
}
}
}
/* 1-wire needs module's internal clocks enabled for reset */
static void sysc_clk_enable_quirk_hdq1w(struct sysc *ddata)
{
int offset = 0x0c; /* HDQ_CTRL_STATUS */
u16 val;
val = sysc_read(ddata, offset);
val |= BIT(5);
sysc_write(ddata, offset, val);
}
/* I2C needs extra enable bit toggling for reset */
static void sysc_clk_quirk_i2c(struct sysc *ddata, bool enable)
{
int offset;
u16 val;
/* I2C_CON, omap2/3 is different from omap4 and later */
if ((ddata->revision & 0xffffff00) == 0x001f0000)
offset = 0x24;
else
offset = 0xa4;
/* I2C_EN */
val = sysc_read(ddata, offset);
if (enable)
val |= BIT(15);
else
val &= ~BIT(15);
sysc_write(ddata, offset, val);
}
static void sysc_clk_enable_quirk_i2c(struct sysc *ddata)
{
sysc_clk_quirk_i2c(ddata, true);
}
static void sysc_clk_disable_quirk_i2c(struct sysc *ddata)
{
sysc_clk_quirk_i2c(ddata, false);
}
/* Watchdog timer needs a disable sequence after reset */
static void sysc_reset_done_quirk_wdt(struct sysc *ddata)
{
int wps, spr, error;
u32 val;
wps = 0x34;
spr = 0x48;
sysc_write(ddata, spr, 0xaaaa);
error = readl_poll_timeout(ddata->module_va + wps, val,
!(val & 0x10), 100,
MAX_MODULE_SOFTRESET_WAIT);
if (error)
dev_warn(ddata->dev, "wdt disable spr failed\n");
sysc_write(ddata, wps, 0x5555);
error = readl_poll_timeout(ddata->module_va + wps, val,
!(val & 0x10), 100,
MAX_MODULE_SOFTRESET_WAIT);
if (error)
dev_warn(ddata->dev, "wdt disable wps failed\n");
}
static void sysc_init_module_quirks(struct sysc *ddata)
{
if (ddata->legacy_mode || !ddata->name)
return;
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_HDQ1W) {
ddata->clk_enable_quirk = sysc_clk_enable_quirk_hdq1w;
return;
}
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_I2C) {
ddata->clk_enable_quirk = sysc_clk_enable_quirk_i2c;
ddata->clk_disable_quirk = sysc_clk_disable_quirk_i2c;
return;
}
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_WDT)
ddata->reset_done_quirk = sysc_reset_done_quirk_wdt;
}
static int sysc_clockdomain_init(struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
struct clk *fck = NULL, *ick = NULL;
int error;
if (!pdata || !pdata->init_clockdomain)
return 0;
switch (ddata->nr_clocks) {
case 2:
ick = ddata->clocks[SYSC_ICK];
/* fallthrough */
case 1:
fck = ddata->clocks[SYSC_FCK];
break;
case 0:
return 0;
}
error = pdata->init_clockdomain(ddata->dev, fck, ick, &ddata->cookie);
if (!error || error == -ENODEV)
return 0;
return error;
}
/*
* Note that pdata->init_module() typically does a reset first. After
* pdata->init_module() is done, PM runtime can be used for the interconnect
* target module.
*/
static int sysc_legacy_init(struct sysc *ddata)
{
struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
int error;
if (!pdata || !pdata->init_module)
return 0;
error = pdata->init_module(ddata->dev, ddata->mdata, &ddata->cookie);
if (error == -EEXIST)
error = 0;
return error;
}
/**
* sysc_rstctrl_reset_deassert - deassert rstctrl reset
* @ddata: device driver data
* @reset: reset before deassert
*
* 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_rstctrl_reset_deassert(struct sysc *ddata, bool reset)
{
int error, val;
if (!ddata->rsts)
return 0;
if (reset) {
error = reset_control_assert(ddata->rsts);
if (error)
return error;
}
error = reset_control_deassert(ddata->rsts);
if (error == -EEXIST)
return 0;
error = readx_poll_timeout(reset_control_status, ddata->rsts, val,
val == 0, 100, MAX_MODULE_SOFTRESET_WAIT);
return error;
}
/*
* Note that the caller must ensure the interconnect target module is enabled
* before calling reset. Otherwise reset will not complete.
*/
static int sysc_reset(struct sysc *ddata)
{
int sysc_offset, syss_offset, sysc_val, rstval, quirks, error = 0;
u32 sysc_mask, syss_done;
sysc_offset = ddata->offsets[SYSC_SYSCONFIG];
syss_offset = ddata->offsets[SYSC_SYSSTATUS];
quirks = ddata->cfg.quirks;
if (ddata->legacy_mode || sysc_offset < 0 ||
ddata->cap->regbits->srst_shift < 0 ||
ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
return 0;
sysc_mask = BIT(ddata->cap->regbits->srst_shift);
if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED)
syss_done = 0;
else
syss_done = ddata->cfg.syss_mask;
if (ddata->clk_disable_quirk)
ddata->clk_disable_quirk(ddata);
sysc_val = sysc_read_sysconfig(ddata);
sysc_val |= sysc_mask;
sysc_write(ddata, sysc_offset, sysc_val);
if (ddata->clk_enable_quirk)
ddata->clk_enable_quirk(ddata);
/* Poll on reset status */
if (syss_offset >= 0) {
error = readx_poll_timeout(sysc_read_sysstatus, ddata, rstval,
(rstval & ddata->cfg.syss_mask) ==
syss_done,
100, MAX_MODULE_SOFTRESET_WAIT);
} else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
error = readx_poll_timeout(sysc_read_sysconfig, ddata, rstval,
!(rstval & sysc_mask),
100, MAX_MODULE_SOFTRESET_WAIT);
}
if (ddata->reset_done_quirk)
ddata->reset_done_quirk(ddata);
return error;
}
/*
* At this point the module is configured enough to read the revision but
* module may not be completely configured yet to use PM runtime. Enable
* all clocks directly during init to configure the quirks needed for PM
* runtime based on the revision register.
*/
static int sysc_init_module(struct sysc *ddata)
{
int error = 0;
bool manage_clocks = true;
error = sysc_rstctrl_reset_deassert(ddata, false);
if (error)
return error;
if (ddata->cfg.quirks &
(SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))
manage_clocks = false;
error = sysc_clockdomain_init(ddata);
if (error)
return error;
if (manage_clocks) {
sysc_clkdm_deny_idle(ddata);
error = sysc_enable_opt_clocks(ddata);
if (error)
return error;
error = sysc_enable_main_clocks(ddata);
if (error)
goto err_opt_clocks;
}
if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)) {
error = sysc_rstctrl_reset_deassert(ddata, true);
if (error)
goto err_main_clocks;
}
ddata->revision = sysc_read_revision(ddata);
sysc_init_revision_quirks(ddata);
sysc_init_module_quirks(ddata);
if (ddata->legacy_mode) {
error = sysc_legacy_init(ddata);
if (error)
goto err_main_clocks;
}
if (!ddata->legacy_mode && manage_clocks) {
error = sysc_enable_module(ddata->dev);
if (error)
goto err_main_clocks;
}
error = sysc_reset(ddata);
if (error)
dev_err(ddata->dev, "Reset failed with %d\n", error);
if (!ddata->legacy_mode && manage_clocks)
sysc_disable_module(ddata->dev);
err_main_clocks:
if (manage_clocks)
sysc_disable_main_clocks(ddata);
err_opt_clocks:
if (manage_clocks) {
sysc_disable_opt_clocks(ddata);
sysc_clkdm_allow_idle(ddata);
}
return error;
}
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;
if (val)
ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
else
ddata->cfg.sysc_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_dbg(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
static 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->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, },
{ .name = "ti,no-idle",
.mask = SYSC_QUIRK_NO_IDLE, },
};
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,
.mod_quirks = SYSS_QUIRK_RESETDONE_INVERTED,
};
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;
if (!pdata)
return 0;
mdata = devm_kzalloc(ddata->dev, sizeof(*mdata), GFP_KERNEL);
if (!mdata)
return -ENOMEM;
if (ddata->legacy_mode) {
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;
}
ddata->mdata = mdata;
return 0;
}
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)
goto unprepare;
error = sysc_map_and_check_registers(ddata);
if (error)
goto unprepare;
error = sysc_init_sysc_mask(ddata);
if (error)
goto unprepare;
error = sysc_init_idlemodes(ddata);
if (error)
goto unprepare;
error = sysc_init_syss_mask(ddata);
if (error)
goto unprepare;
error = sysc_init_pdata(ddata);
if (error)
goto unprepare;
sysc_init_early_quirks(ddata);
error = sysc_get_clocks(ddata);
if (error)
return error;
error = sysc_init_resets(ddata);
if (error)
return error;
error = sysc_init_module(ddata);
if (error)
goto unprepare;
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;
}
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))
ddata->disable_on_idle = true;
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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