#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/delay.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "pmc.h"
#define SLOW_CLOCK_FREQ 32768
#define MAINF_DIV 16
#define MAINFRDY_TIMEOUT (((MAINF_DIV + 1) * USEC_PER_SEC) / \
SLOW_CLOCK_FREQ)
#define MAINF_LOOP_MIN_WAIT (USEC_PER_SEC / SLOW_CLOCK_FREQ)
#define MAINF_LOOP_MAX_WAIT MAINFRDY_TIMEOUT
#define MOR_KEY_MASK (0xff << 16)
#define clk_main_parent_select(s) (((s) & \
(AT91_PMC_MOSCEN | \
AT91_PMC_OSCBYPASS)) ? 1 : 0)
struct clk_main_osc {
struct clk_hw hw;
struct regmap *regmap;
struct at91_clk_pms pms;
};
#define to_clk_main_osc(hw) container_of(hw, struct clk_main_osc, hw)
struct clk_main_rc_osc {
struct clk_hw hw;
struct regmap *regmap;
unsigned long frequency;
unsigned long accuracy;
struct at91_clk_pms pms;
};
#define to_clk_main_rc_osc(hw) container_of(hw, struct clk_main_rc_osc, hw)
struct clk_rm9200_main {
struct clk_hw hw;
struct regmap *regmap;
};
#define to_clk_rm9200_main(hw) container_of(hw, struct clk_rm9200_main, hw)
struct clk_sam9x5_main {
struct clk_hw hw;
struct regmap *regmap;
struct at91_clk_pms pms;
u8 parent;
};
#define to_clk_sam9x5_main(hw) container_of(hw, struct clk_sam9x5_main, hw)
static inline bool clk_main_osc_ready(struct regmap *regmap)
{
unsigned int status;
regmap_read(regmap, AT91_PMC_SR, &status);
return status & AT91_PMC_MOSCS;
}
static int clk_main_osc_prepare(struct clk_hw *hw)
{
struct clk_main_osc *osc = to_clk_main_osc(hw);
struct regmap *regmap = osc->regmap;
u32 tmp;
regmap_read(regmap, AT91_CKGR_MOR, &tmp);
tmp &= ~MOR_KEY_MASK;
if (tmp & AT91_PMC_OSCBYPASS)
return 0;
if (!(tmp & AT91_PMC_MOSCEN)) {
tmp |= AT91_PMC_MOSCEN | AT91_PMC_KEY;
regmap_write(regmap, AT91_CKGR_MOR, tmp);
}
while (!clk_main_osc_ready(regmap))
cpu_relax();
return 0;
}
static void clk_main_osc_unprepare(struct clk_hw *hw)
{
struct clk_main_osc *osc = to_clk_main_osc(hw);
struct regmap *regmap = osc->regmap;
u32 tmp;
regmap_read(regmap, AT91_CKGR_MOR, &tmp);
if (tmp & AT91_PMC_OSCBYPASS)
return;
if (!(tmp & AT91_PMC_MOSCEN))
return;
tmp &= ~(AT91_PMC_KEY | AT91_PMC_MOSCEN);
regmap_write(regmap, AT91_CKGR_MOR, tmp | AT91_PMC_KEY);
}
static int clk_main_osc_is_prepared(struct clk_hw *hw)
{
struct clk_main_osc *osc = to_clk_main_osc(hw);
struct regmap *regmap = osc->regmap;
u32 tmp, status;
regmap_read(regmap, AT91_CKGR_MOR, &tmp);
if (tmp & AT91_PMC_OSCBYPASS)
return 1;
regmap_read(regmap, AT91_PMC_SR, &status);
return (status & AT91_PMC_MOSCS) && clk_main_parent_select(tmp);
}
static int clk_main_osc_save_context(struct clk_hw *hw)
{
struct clk_main_osc *osc = to_clk_main_osc(hw);
osc->pms.status = clk_main_osc_is_prepared(hw);
return 0;
}
static void clk_main_osc_restore_context(struct clk_hw *hw)
{
struct clk_main_osc *osc = to_clk_main_osc(hw);
if (osc->pms.status)
clk_main_osc_prepare(hw);
}
static const struct clk_ops main_osc_ops = {
.prepare = clk_main_osc_prepare,
.unprepare = clk_main_osc_unprepare,
.is_prepared = clk_main_osc_is_prepared,
.save_context = clk_main_osc_save_context,
.restore_context = clk_main_osc_restore_context,
};
struct clk_hw * __init
at91_clk_register_main_osc(struct regmap *regmap,
const char *name,
const char *parent_name,
struct clk_parent_data *parent_data,
bool bypass)
{
struct clk_main_osc *osc;
struct clk_init_data init = {};
struct clk_hw *hw;
int ret;
if (!name || !(parent_name || parent_data))
return ERR_PTR(-EINVAL);
osc = kzalloc_obj(*osc);
if (!osc)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &main_osc_ops;
if (parent_data)
init.parent_data = (const struct clk_parent_data *)parent_data;
else
init.parent_names = &parent_name;
init.num_parents = 1;
init.flags = CLK_IGNORE_UNUSED;
osc->hw.init = &init;
osc->regmap = regmap;
if (bypass)
regmap_update_bits(regmap,
AT91_CKGR_MOR, MOR_KEY_MASK |
AT91_PMC_OSCBYPASS,
AT91_PMC_OSCBYPASS | AT91_PMC_KEY);
hw = &osc->hw;
ret = clk_hw_register(NULL, &osc->hw);
if (ret) {
kfree(osc);
hw = ERR_PTR(ret);
}
return hw;
}
static bool clk_main_rc_osc_ready(struct regmap *regmap)
{
unsigned int status;
regmap_read(regmap, AT91_PMC_SR, &status);
return !!(status & AT91_PMC_MOSCRCS);
}
static int clk_main_rc_osc_prepare(struct clk_hw *hw)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
struct regmap *regmap = osc->regmap;
unsigned int mor;
regmap_read(regmap, AT91_CKGR_MOR, &mor);
if (!(mor & AT91_PMC_MOSCRCEN))
regmap_update_bits(regmap, AT91_CKGR_MOR,
MOR_KEY_MASK | AT91_PMC_MOSCRCEN,
AT91_PMC_MOSCRCEN | AT91_PMC_KEY);
while (!clk_main_rc_osc_ready(regmap))
cpu_relax();
return 0;
}
static void clk_main_rc_osc_unprepare(struct clk_hw *hw)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
struct regmap *regmap = osc->regmap;
unsigned int mor;
regmap_read(regmap, AT91_CKGR_MOR, &mor);
if (!(mor & AT91_PMC_MOSCRCEN))
return;
regmap_update_bits(regmap, AT91_CKGR_MOR,
MOR_KEY_MASK | AT91_PMC_MOSCRCEN, AT91_PMC_KEY);
}
static int clk_main_rc_osc_is_prepared(struct clk_hw *hw)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
struct regmap *regmap = osc->regmap;
unsigned int mor, status;
regmap_read(regmap, AT91_CKGR_MOR, &mor);
regmap_read(regmap, AT91_PMC_SR, &status);
return (mor & AT91_PMC_MOSCRCEN) && (status & AT91_PMC_MOSCRCS);
}
static unsigned long clk_main_rc_osc_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
return osc->frequency;
}
static unsigned long clk_main_rc_osc_recalc_accuracy(struct clk_hw *hw,
unsigned long parent_acc)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
return osc->accuracy;
}
static int clk_main_rc_osc_save_context(struct clk_hw *hw)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
osc->pms.status = clk_main_rc_osc_is_prepared(hw);
return 0;
}
static void clk_main_rc_osc_restore_context(struct clk_hw *hw)
{
struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
if (osc->pms.status)
clk_main_rc_osc_prepare(hw);
}
static const struct clk_ops main_rc_osc_ops = {
.prepare = clk_main_rc_osc_prepare,
.unprepare = clk_main_rc_osc_unprepare,
.is_prepared = clk_main_rc_osc_is_prepared,
.recalc_rate = clk_main_rc_osc_recalc_rate,
.recalc_accuracy = clk_main_rc_osc_recalc_accuracy,
.save_context = clk_main_rc_osc_save_context,
.restore_context = clk_main_rc_osc_restore_context,
};
struct clk_hw * __init
at91_clk_register_main_rc_osc(struct regmap *regmap,
const char *name,
u32 frequency, u32 accuracy)
{
struct clk_main_rc_osc *osc;
struct clk_init_data init;
struct clk_hw *hw;
int ret;
if (!name || !frequency)
return ERR_PTR(-EINVAL);
osc = kzalloc_obj(*osc);
if (!osc)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &main_rc_osc_ops;
init.parent_names = NULL;
init.num_parents = 0;
init.flags = CLK_IGNORE_UNUSED;
osc->hw.init = &init;
osc->regmap = regmap;
osc->frequency = frequency;
osc->accuracy = accuracy;
hw = &osc->hw;
ret = clk_hw_register(NULL, hw);
if (ret) {
kfree(osc);
hw = ERR_PTR(ret);
}
return hw;
}
static int clk_main_probe_frequency(struct regmap *regmap)
{
unsigned long prep_time, timeout;
unsigned int mcfr;
timeout = jiffies + usecs_to_jiffies(MAINFRDY_TIMEOUT);
do {
prep_time = jiffies;
regmap_read(regmap, AT91_CKGR_MCFR, &mcfr);
if (mcfr & AT91_PMC_MAINRDY)
return 0;
if (system_state < SYSTEM_RUNNING)
udelay(MAINF_LOOP_MIN_WAIT);
else
usleep_range(MAINF_LOOP_MIN_WAIT, MAINF_LOOP_MAX_WAIT);
} while (time_before(prep_time, timeout));
return -ETIMEDOUT;
}
static unsigned long clk_main_recalc_rate(struct regmap *regmap,
unsigned long parent_rate)
{
unsigned int mcfr;
if (parent_rate)
return parent_rate;
pr_warn("Main crystal frequency not set, using approximate value\n");
regmap_read(regmap, AT91_CKGR_MCFR, &mcfr);
if (!(mcfr & AT91_PMC_MAINRDY))
return 0;
return ((mcfr & AT91_PMC_MAINF) * SLOW_CLOCK_FREQ) / MAINF_DIV;
}
static int clk_rm9200_main_prepare(struct clk_hw *hw)
{
struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
return clk_main_probe_frequency(clkmain->regmap);
}
static int clk_rm9200_main_is_prepared(struct clk_hw *hw)
{
struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
unsigned int status;
regmap_read(clkmain->regmap, AT91_CKGR_MCFR, &status);
return !!(status & AT91_PMC_MAINRDY);
}
static unsigned long clk_rm9200_main_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
return clk_main_recalc_rate(clkmain->regmap, parent_rate);
}
static const struct clk_ops rm9200_main_ops = {
.prepare = clk_rm9200_main_prepare,
.is_prepared = clk_rm9200_main_is_prepared,
.recalc_rate = clk_rm9200_main_recalc_rate,
};
struct clk_hw * __init
at91_clk_register_rm9200_main(struct regmap *regmap,
const char *name,
const char *parent_name,
struct clk_hw *parent_hw)
{
struct clk_rm9200_main *clkmain;
struct clk_init_data init = {};
struct clk_hw *hw;
int ret;
if (!name)
return ERR_PTR(-EINVAL);
if (!(parent_name || parent_hw))
return ERR_PTR(-EINVAL);
clkmain = kzalloc_obj(*clkmain);
if (!clkmain)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &rm9200_main_ops;
if (parent_hw)
init.parent_hws = (const struct clk_hw **)&parent_hw;
else
init.parent_names = &parent_name;
init.num_parents = 1;
init.flags = 0;
clkmain->hw.init = &init;
clkmain->regmap = regmap;
hw = &clkmain->hw;
ret = clk_hw_register(NULL, &clkmain->hw);
if (ret) {
kfree(clkmain);
hw = ERR_PTR(ret);
}
return hw;
}
static inline bool clk_sam9x5_main_ready(struct regmap *regmap)
{
unsigned int status;
regmap_read(regmap, AT91_PMC_SR, &status);
return !!(status & AT91_PMC_MOSCSELS);
}
static int clk_sam9x5_main_prepare(struct clk_hw *hw)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
struct regmap *regmap = clkmain->regmap;
while (!clk_sam9x5_main_ready(regmap))
cpu_relax();
return clk_main_probe_frequency(regmap);
}
static int clk_sam9x5_main_is_prepared(struct clk_hw *hw)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
return clk_sam9x5_main_ready(clkmain->regmap);
}
static unsigned long clk_sam9x5_main_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
return clk_main_recalc_rate(clkmain->regmap, parent_rate);
}
static int clk_sam9x5_main_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
struct regmap *regmap = clkmain->regmap;
unsigned int tmp;
if (index > 1)
return -EINVAL;
regmap_read(regmap, AT91_CKGR_MOR, &tmp);
if (index && !(tmp & AT91_PMC_MOSCSEL))
tmp = AT91_PMC_MOSCSEL;
else if (!index && (tmp & AT91_PMC_MOSCSEL))
tmp = 0;
else
return 0;
regmap_update_bits(regmap, AT91_CKGR_MOR,
AT91_PMC_MOSCSEL | MOR_KEY_MASK,
tmp | AT91_PMC_KEY);
while (!clk_sam9x5_main_ready(regmap))
cpu_relax();
return 0;
}
static u8 clk_sam9x5_main_get_parent(struct clk_hw *hw)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
unsigned int status;
regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status);
return clk_main_parent_select(status);
}
static int clk_sam9x5_main_save_context(struct clk_hw *hw)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
clkmain->pms.status = clk_main_rc_osc_is_prepared(&clkmain->hw);
clkmain->pms.parent = clk_sam9x5_main_get_parent(&clkmain->hw);
return 0;
}
static void clk_sam9x5_main_restore_context(struct clk_hw *hw)
{
struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
int ret;
ret = clk_sam9x5_main_set_parent(hw, clkmain->pms.parent);
if (ret)
return;
if (clkmain->pms.status)
clk_sam9x5_main_prepare(hw);
}
static const struct clk_ops sam9x5_main_ops = {
.prepare = clk_sam9x5_main_prepare,
.is_prepared = clk_sam9x5_main_is_prepared,
.recalc_rate = clk_sam9x5_main_recalc_rate,
.determine_rate = clk_hw_determine_rate_no_reparent,
.set_parent = clk_sam9x5_main_set_parent,
.get_parent = clk_sam9x5_main_get_parent,
.save_context = clk_sam9x5_main_save_context,
.restore_context = clk_sam9x5_main_restore_context,
};
struct clk_hw * __init
at91_clk_register_sam9x5_main(struct regmap *regmap,
const char *name,
const char **parent_names,
struct clk_hw **parent_hws,
int num_parents)
{
struct clk_sam9x5_main *clkmain;
struct clk_init_data init = {};
unsigned int status;
struct clk_hw *hw;
int ret;
if (!name)
return ERR_PTR(-EINVAL);
if (!(parent_hws || parent_names) || !num_parents)
return ERR_PTR(-EINVAL);
clkmain = kzalloc_obj(*clkmain);
if (!clkmain)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &sam9x5_main_ops;
if (parent_hws)
init.parent_hws = (const struct clk_hw **)parent_hws;
else
init.parent_names = parent_names;
init.num_parents = num_parents;
init.flags = CLK_SET_PARENT_GATE;
clkmain->hw.init = &init;
clkmain->regmap = regmap;
regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status);
clkmain->parent = clk_main_parent_select(status);
hw = &clkmain->hw;
ret = clk_hw_register(NULL, &clkmain->hw);
if (ret) {
kfree(clkmain);
hw = ERR_PTR(ret);
}
return hw;
}
