// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP clkctrl clock support
*
* Copyright (C) 2017 Texas Instruments, Inc.
*
* Tero Kristo <[email protected]>
*/
#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>
#include <linux/delay.h>
#include <linux/string_helpers.h>
#include <linux/timekeeping.h>
#include "clock.h"
#define NO_IDLEST 0
#define OMAP4_MODULEMODE_MASK 0x3
#define MODULEMODE_HWCTRL 0x1
#define MODULEMODE_SWCTRL 0x2
#define OMAP4_IDLEST_MASK (0x3 << 16)
#define OMAP4_IDLEST_SHIFT 16
#define OMAP4_STBYST_MASK BIT(18)
#define OMAP4_STBYST_SHIFT 18
#define CLKCTRL_IDLEST_FUNCTIONAL 0x0
#define CLKCTRL_IDLEST_INTERFACE_IDLE 0x2
#define CLKCTRL_IDLEST_DISABLED 0x3
/* These timeouts are in us */
#define OMAP4_MAX_MODULE_READY_TIME 2000
#define OMAP4_MAX_MODULE_DISABLE_TIME 5000
static bool _early_timeout = true;
struct omap_clkctrl_provider {
void __iomem *base;
struct list_head clocks;
char *clkdm_name;
};
struct omap_clkctrl_clk {
struct clk_hw *clk;
u16 reg_offset;
int bit_offset;
struct list_head node;
};
union omap4_timeout {
u32 cycles;
ktime_t start;
};
static const struct omap_clkctrl_data default_clkctrl_data[] __initconst = {
{ 0 },
};
static u32 _omap4_idlest(u32 val)
{
val &= OMAP4_IDLEST_MASK;
val >>= OMAP4_IDLEST_SHIFT;
return val;
}
static bool _omap4_is_idle(u32 val)
{
val = _omap4_idlest(val);
return val == CLKCTRL_IDLEST_DISABLED;
}
static bool _omap4_is_ready(u32 val)
{
val = _omap4_idlest(val);
return val == CLKCTRL_IDLEST_FUNCTIONAL ||
val == CLKCTRL_IDLEST_INTERFACE_IDLE;
}
static bool _omap4_is_timeout(union omap4_timeout *time, u32 timeout)
{
/*
* There are two special cases where ktime_to_ns() can't be
* used to track the timeouts. First one is during early boot
* when the timers haven't been initialized yet. The second
* one is during suspend-resume cycle while timekeeping is
* being suspended / resumed. Clocksource for the system
* can be from a timer that requires pm_runtime access, which
* will eventually bring us here with timekeeping_suspended,
* during both suspend entry and resume paths. This happens
* at least on am43xx platform. Account for flakeyness
* with udelay() by multiplying the timeout value by 2.
*/
if (unlikely(_early_timeout || timekeeping_suspended)) {
if (time->cycles++ < timeout) {
udelay(1 * 2);
return false;
}
} else {
if (!ktime_to_ns(time->start)) {
time->start = ktime_get();
return false;
}
if (ktime_us_delta(ktime_get(), time->start) < timeout) {
cpu_relax();
return false;
}
}
return true;
}
static int __init _omap4_disable_early_timeout(void)
{
_early_timeout = false;
return 0;
}
arch_initcall(_omap4_disable_early_timeout);
static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
u32 val;
int ret;
union omap4_timeout timeout = { 0 };
if (clk->clkdm) {
ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);
if (ret) {
WARN(1,
"%s: could not enable %s's clockdomain %s: %d\n",
__func__, clk_hw_get_name(hw),
clk->clkdm_name, ret);
return ret;
}
}
if (!clk->enable_bit)
return 0;
val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
val &= ~OMAP4_MODULEMODE_MASK;
val |= clk->enable_bit;
ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
if (test_bit(NO_IDLEST, &clk->flags))
return 0;
/* Wait until module is enabled */
while (!_omap4_is_ready(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
if (_omap4_is_timeout(&timeout, OMAP4_MAX_MODULE_READY_TIME)) {
pr_err("%s: failed to enable\n", clk_hw_get_name(hw));
return -EBUSY;
}
}
return 0;
}
static void _omap4_clkctrl_clk_disable(struct clk_hw *hw)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
u32 val;
union omap4_timeout timeout = { 0 };
if (!clk->enable_bit)
goto exit;
val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
val &= ~OMAP4_MODULEMODE_MASK;
ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
if (test_bit(NO_IDLEST, &clk->flags))
goto exit;
/* Wait until module is disabled */
while (!_omap4_is_idle(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
if (_omap4_is_timeout(&timeout,
OMAP4_MAX_MODULE_DISABLE_TIME)) {
pr_err("%s: failed to disable\n", clk_hw_get_name(hw));
break;
}
}
exit:
if (clk->clkdm)
ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk);
}
static int _omap4_clkctrl_clk_is_enabled(struct clk_hw *hw)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
u32 val;
val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
if (val & clk->enable_bit)
return 1;
return 0;
}
static const struct clk_ops omap4_clkctrl_clk_ops = {
.enable = _omap4_clkctrl_clk_enable,
.disable = _omap4_clkctrl_clk_disable,
.is_enabled = _omap4_clkctrl_clk_is_enabled,
.init = omap2_init_clk_clkdm,
};
static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
void *data)
{
struct omap_clkctrl_provider *provider = data;
struct omap_clkctrl_clk *entry = NULL, *iter;
if (clkspec->args_count != 2)
return ERR_PTR(-EINVAL);
pr_debug("%s: looking for %x:%x\n", __func__,
clkspec->args[0], clkspec->args[1]);
list_for_each_entry(iter, &provider->clocks, node) {
if (iter->reg_offset == clkspec->args[0] &&
iter->bit_offset == clkspec->args[1]) {
entry = iter;
break;
}
}
if (!entry)
return ERR_PTR(-EINVAL);
return entry->clk;
}
/* Get clkctrl clock base name based on clkctrl_name or dts node */
static const char * __init clkctrl_get_clock_name(struct device_node *np,
const char *clkctrl_name,
int offset, int index,
bool legacy_naming)
{
char *clock_name;
/* l4per-clkctrl:1234:0 style naming based on clkctrl_name */
if (clkctrl_name && !legacy_naming) {
clock_name = kasprintf(GFP_KERNEL, "%s-clkctrl:%04x:%d",
clkctrl_name, offset, index);
if (!clock_name)
return NULL;
strreplace(clock_name, '_', '-');
return clock_name;
}
/* l4per:1234:0 old style naming based on clkctrl_name */
if (clkctrl_name)
return kasprintf(GFP_KERNEL, "%s_cm:clk:%04x:%d",
clkctrl_name, offset, index);
/* l4per_cm:1234:0 old style naming based on parent node name */
if (legacy_naming)
return kasprintf(GFP_KERNEL, "%pOFn:clk:%04x:%d",
np->parent, offset, index);
/* l4per-clkctrl:1234:0 style naming based on node name */
return kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", np, offset, index);
}
static int __init
_ti_clkctrl_clk_register(struct omap_clkctrl_provider *provider,
struct device_node *node, struct clk_hw *clk_hw,
u16 offset, u8 bit, const char * const *parents,
int num_parents, const struct clk_ops *ops,
const char *clkctrl_name)
{
struct clk_init_data init = { NULL };
struct clk *clk;
struct omap_clkctrl_clk *clkctrl_clk;
int ret = 0;
init.name = clkctrl_get_clock_name(node, clkctrl_name, offset, bit,
ti_clk_get_features()->flags &
TI_CLK_CLKCTRL_COMPAT);
clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
if (!init.name || !clkctrl_clk) {
ret = -ENOMEM;
goto cleanup;
}
clk_hw->init = &init;
init.parent_names = parents;
init.num_parents = num_parents;
init.ops = ops;
init.flags = 0;
clk = of_ti_clk_register(node, clk_hw, init.name);
if (IS_ERR_OR_NULL(clk)) {
ret = -EINVAL;
goto cleanup;
}
clkctrl_clk->reg_offset = offset;
clkctrl_clk->bit_offset = bit;
clkctrl_clk->clk = clk_hw;
list_add(&clkctrl_clk->node, &provider->clocks);
return 0;
cleanup:
kfree(init.name);
kfree(clkctrl_clk);
return ret;
}
static void __init
_ti_clkctrl_setup_gate(struct omap_clkctrl_provider *provider,
struct device_node *node, u16 offset,
const struct omap_clkctrl_bit_data *data,
void __iomem *reg, const char *clkctrl_name)
{
struct clk_hw_omap *clk_hw;
clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
if (!clk_hw)
return;
clk_hw->enable_bit = data->bit;
clk_hw->enable_reg.ptr = reg;
if (_ti_clkctrl_clk_register(provider, node, &clk_hw->hw, offset,
data->bit, data->parents, 1,
&omap_gate_clk_ops, clkctrl_name))
kfree(clk_hw);
}
static void __init
_ti_clkctrl_setup_mux(struct omap_clkctrl_provider *provider,
struct device_node *node, u16 offset,
const struct omap_clkctrl_bit_data *data,
void __iomem *reg, const char *clkctrl_name)
{
struct clk_omap_mux *mux;
int num_parents = 0;
const char * const *pname;
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
return;
pname = data->parents;
while (*pname) {
num_parents++;
pname++;
}
mux->mask = num_parents;
if (!(mux->flags & CLK_MUX_INDEX_ONE))
mux->mask--;
mux->mask = (1 << fls(mux->mask)) - 1;
mux->shift = data->bit;
mux->reg.ptr = reg;
if (_ti_clkctrl_clk_register(provider, node, &mux->hw, offset,
data->bit, data->parents, num_parents,
&ti_clk_mux_ops, clkctrl_name))
kfree(mux);
}
static void __init
_ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
struct device_node *node, u16 offset,
const struct omap_clkctrl_bit_data *data,
void __iomem *reg, const char *clkctrl_name)
{
struct clk_omap_divider *div;
const struct omap_clkctrl_div_data *div_data = data->data;
u8 div_flags = 0;
div = kzalloc(sizeof(*div), GFP_KERNEL);
if (!div)
return;
div->reg.ptr = reg;
div->shift = data->bit;
div->flags = div_data->flags;
if (div->flags & CLK_DIVIDER_POWER_OF_TWO)
div_flags |= CLKF_INDEX_POWER_OF_TWO;
if (ti_clk_parse_divider_data((int *)div_data->dividers, 0,
div_data->max_div, div_flags,
div)) {
pr_err("%s: Data parsing for %pOF:%04x:%d failed\n", __func__,
node, offset, data->bit);
kfree(div);
return;
}
if (_ti_clkctrl_clk_register(provider, node, &div->hw, offset,
data->bit, data->parents, 1,
&ti_clk_divider_ops, clkctrl_name))
kfree(div);
}
static void __init
_ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
struct device_node *node,
const struct omap_clkctrl_reg_data *data,
void __iomem *reg, const char *clkctrl_name)
{
const struct omap_clkctrl_bit_data *bits = data->bit_data;
if (!bits)
return;
while (bits->bit) {
switch (bits->type) {
case TI_CLK_GATE:
_ti_clkctrl_setup_gate(provider, node, data->offset,
bits, reg, clkctrl_name);
break;
case TI_CLK_DIVIDER:
_ti_clkctrl_setup_div(provider, node, data->offset,
bits, reg, clkctrl_name);
break;
case TI_CLK_MUX:
_ti_clkctrl_setup_mux(provider, node, data->offset,
bits, reg, clkctrl_name);
break;
default:
pr_err("%s: bad subclk type: %d\n", __func__,
bits->type);
return;
}
bits++;
}
}
static void __init _clkctrl_add_provider(void *data,
struct device_node *np)
{
of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data);
}
/*
* Get clock name based on "clock-output-names" property or the
* compatible property for clkctrl.
*/
static const char * __init clkctrl_get_name(struct device_node *np)
{
struct property *prop;
const int prefix_len = 11;
const char *compat;
const char *output;
const char *end;
char *name;
if (!of_property_read_string_index(np, "clock-output-names", 0,
&output)) {
int len;
len = strlen(output);
end = strstr(output, "_clkctrl");
if (end)
len -= strlen(end);
name = kstrndup(output, len, GFP_KERNEL);
return name;
}
of_property_for_each_string(np, "compatible", prop, compat) {
if (!strncmp("ti,clkctrl-", compat, prefix_len)) {
end = compat + prefix_len;
/* Two letter minimum name length for l3, l4 etc */
if (strnlen(end, 16) < 2)
continue;
name = kstrdup_and_replace(end, '-', '_', GFP_KERNEL);
if (!name)
continue;
return name;
}
}
return NULL;
}
static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
{
struct omap_clkctrl_provider *provider;
const struct omap_clkctrl_data *data = default_clkctrl_data;
const struct omap_clkctrl_reg_data *reg_data;
struct clk_init_data init = { NULL };
struct clk_hw_omap *hw;
struct clk *clk;
struct omap_clkctrl_clk *clkctrl_clk = NULL;
bool legacy_naming;
const char *clkctrl_name;
u32 addr;
int ret;
char *c;
u16 soc_mask = 0;
struct resource res;
of_address_to_resource(node, 0, &res);
addr = (u32)res.start;
#ifdef CONFIG_ARCH_OMAP4
if (of_machine_is_compatible("ti,omap4"))
data = omap4_clkctrl_data;
#endif
#ifdef CONFIG_SOC_OMAP5
if (of_machine_is_compatible("ti,omap5"))
data = omap5_clkctrl_data;
#endif
#ifdef CONFIG_SOC_DRA7XX
if (of_machine_is_compatible("ti,dra7"))
data = dra7_clkctrl_data;
if (of_machine_is_compatible("ti,dra72"))
soc_mask = CLKF_SOC_DRA72;
if (of_machine_is_compatible("ti,dra74"))
soc_mask = CLKF_SOC_DRA74;
if (of_machine_is_compatible("ti,dra76"))
soc_mask = CLKF_SOC_DRA76;
#endif
#ifdef CONFIG_SOC_AM33XX
if (of_machine_is_compatible("ti,am33xx"))
data = am3_clkctrl_data;
#endif
#ifdef CONFIG_SOC_AM43XX
if (of_machine_is_compatible("ti,am4372"))
data = am4_clkctrl_data;
if (of_machine_is_compatible("ti,am438x"))
data = am438x_clkctrl_data;
#endif
#ifdef CONFIG_SOC_TI81XX
if (of_machine_is_compatible("ti,dm814"))
data = dm814_clkctrl_data;
if (of_machine_is_compatible("ti,dm816"))
data = dm816_clkctrl_data;
#endif
if (ti_clk_get_features()->flags & TI_CLK_DEVICE_TYPE_GP)
soc_mask |= CLKF_SOC_NONSEC;
while (data->addr) {
if (addr == data->addr)
break;
data++;
}
if (!data->addr) {
pr_err("%pOF not found from clkctrl data.\n", node);
return;
}
provider = kzalloc(sizeof(*provider), GFP_KERNEL);
if (!provider)
return;
provider->base = of_iomap(node, 0);
legacy_naming = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT;
clkctrl_name = clkctrl_get_name(node);
if (clkctrl_name) {
provider->clkdm_name = kasprintf(GFP_KERNEL,
"%s_clkdm", clkctrl_name);
if (!provider->clkdm_name) {
kfree(provider);
return;
}
goto clkdm_found;
}
/*
* The code below can be removed when all clkctrl nodes use domain
* specific compatible property and standard clock node naming
*/
if (legacy_naming) {
provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFnxxx", node->parent);
if (!provider->clkdm_name) {
kfree(provider);
return;
}
/*
* Create default clkdm name, replace _cm from end of parent
* node name with _clkdm
*/
provider->clkdm_name[strlen(provider->clkdm_name) - 2] = 0;
} else {
provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFn", node);
if (!provider->clkdm_name) {
kfree(provider);
return;
}
/*
* Create default clkdm name, replace _clkctrl from end of
* node name with _clkdm
*/
provider->clkdm_name[strlen(provider->clkdm_name) - 7] = 0;
}
strcat(provider->clkdm_name, "clkdm");
/* Replace any dash from the clkdm name with underscore */
c = provider->clkdm_name;
while (*c) {
if (*c == '-')
*c = '_';
c++;
}
clkdm_found:
INIT_LIST_HEAD(&provider->clocks);
/* Generate clocks */
reg_data = data->regs;
while (reg_data->parent) {
if ((reg_data->flags & CLKF_SOC_MASK) &&
(reg_data->flags & soc_mask) == 0) {
reg_data++;
continue;
}
hw = kzalloc(sizeof(*hw), GFP_KERNEL);
if (!hw)
return;
hw->enable_reg.ptr = provider->base + reg_data->offset;
_ti_clkctrl_setup_subclks(provider, node, reg_data,
hw->enable_reg.ptr, clkctrl_name);
if (reg_data->flags & CLKF_SW_SUP)
hw->enable_bit = MODULEMODE_SWCTRL;
if (reg_data->flags & CLKF_HW_SUP)
hw->enable_bit = MODULEMODE_HWCTRL;
if (reg_data->flags & CLKF_NO_IDLEST)
set_bit(NO_IDLEST, &hw->flags);
if (reg_data->clkdm_name)
hw->clkdm_name = reg_data->clkdm_name;
else
hw->clkdm_name = provider->clkdm_name;
init.parent_names = ®_data->parent;
init.num_parents = 1;
init.flags = 0;
if (reg_data->flags & CLKF_SET_RATE_PARENT)
init.flags |= CLK_SET_RATE_PARENT;
init.name = clkctrl_get_clock_name(node, clkctrl_name,
reg_data->offset, 0,
legacy_naming);
if (!init.name)
goto cleanup;
clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
if (!clkctrl_clk)
goto cleanup;
init.ops = &omap4_clkctrl_clk_ops;
hw->hw.init = &init;
clk = of_ti_clk_register_omap_hw(node, &hw->hw, init.name);
if (IS_ERR_OR_NULL(clk))
goto cleanup;
clkctrl_clk->reg_offset = reg_data->offset;
clkctrl_clk->clk = &hw->hw;
list_add(&clkctrl_clk->node, &provider->clocks);
reg_data++;
}
ret = of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
if (ret == -EPROBE_DEFER)
ti_clk_retry_init(node, provider, _clkctrl_add_provider);
kfree(clkctrl_name);
return;
cleanup:
kfree(hw);
kfree(init.name);
kfree(clkctrl_name);
kfree(clkctrl_clk);
}
CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl",
_ti_omap4_clkctrl_setup);
/**
* ti_clk_is_in_standby - Check if clkctrl clock is in standby or not
* @clk: clock to check standby status for
*
* Finds whether the provided clock is in standby mode or not. Returns
* true if the provided clock is a clkctrl type clock and it is in standby,
* false otherwise.
*/
bool ti_clk_is_in_standby(struct clk *clk)
{
struct clk_hw *hw;
struct clk_hw_omap *hwclk;
u32 val;
hw = __clk_get_hw(clk);
if (!omap2_clk_is_hw_omap(hw))
return false;
hwclk = to_clk_hw_omap(hw);
val = ti_clk_ll_ops->clk_readl(&hwclk->enable_reg);
if (val & OMAP4_STBYST_MASK)
return true;
return false;
}
EXPORT_SYMBOL_GPL(ti_clk_is_in_standby);
Codebase Browser
linux