linuxdebug/drivers/clk/at91/clk-master.c

873 lines
22 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "pmc.h"
#define MASTER_PRES_MASK 0x7
#define MASTER_PRES_MAX MASTER_PRES_MASK
#define MASTER_DIV_SHIFT 8
#define MASTER_DIV_MASK 0x7
#define PMC_MCR_CSS_SHIFT (16)
#define MASTER_MAX_ID 4
#define to_clk_master(hw) container_of(hw, struct clk_master, hw)
struct clk_master {
struct clk_hw hw;
struct regmap *regmap;
spinlock_t *lock;
const struct clk_master_layout *layout;
const struct clk_master_characteristics *characteristics;
struct at91_clk_pms pms;
u32 *mux_table;
u32 mckr;
int chg_pid;
u8 id;
u8 parent;
u8 div;
u32 safe_div;
};
/* MCK div reference to be used by notifier. */
static struct clk_master *master_div;
static inline bool clk_master_ready(struct clk_master *master)
{
unsigned int bit = master->id ? AT91_PMC_MCKXRDY : AT91_PMC_MCKRDY;
unsigned int status;
regmap_read(master->regmap, AT91_PMC_SR, &status);
return !!(status & bit);
}
static int clk_master_prepare(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
spin_lock_irqsave(master->lock, flags);
while (!clk_master_ready(master))
cpu_relax();
spin_unlock_irqrestore(master->lock, flags);
return 0;
}
static int clk_master_is_prepared(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
bool status;
spin_lock_irqsave(master->lock, flags);
status = clk_master_ready(master);
spin_unlock_irqrestore(master->lock, flags);
return status;
}
static unsigned long clk_master_div_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
u8 div;
unsigned long flags, rate = parent_rate;
struct clk_master *master = to_clk_master(hw);
const struct clk_master_layout *layout = master->layout;
const struct clk_master_characteristics *characteristics =
master->characteristics;
unsigned int mckr;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &mckr);
spin_unlock_irqrestore(master->lock, flags);
mckr &= layout->mask;
div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
rate /= characteristics->divisors[div];
if (rate < characteristics->output.min)
pr_warn("master clk div is underclocked");
else if (rate > characteristics->output.max)
pr_warn("master clk div is overclocked");
return rate;
}
static int clk_master_div_save_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
struct clk_hw *parent_hw = clk_hw_get_parent(hw);
unsigned long flags;
unsigned int mckr, div;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &mckr);
spin_unlock_irqrestore(master->lock, flags);
mckr &= master->layout->mask;
div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
div = master->characteristics->divisors[div];
master->pms.parent_rate = clk_hw_get_rate(parent_hw);
master->pms.rate = DIV_ROUND_CLOSEST(master->pms.parent_rate, div);
return 0;
}
static void clk_master_div_restore_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
unsigned int mckr;
u8 div;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &mckr);
spin_unlock_irqrestore(master->lock, flags);
mckr &= master->layout->mask;
div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
div = master->characteristics->divisors[div];
if (div != DIV_ROUND_CLOSEST(master->pms.parent_rate, master->pms.rate))
pr_warn("MCKR DIV not configured properly by firmware!\n");
}
static const struct clk_ops master_div_ops = {
.prepare = clk_master_prepare,
.is_prepared = clk_master_is_prepared,
.recalc_rate = clk_master_div_recalc_rate,
.save_context = clk_master_div_save_context,
.restore_context = clk_master_div_restore_context,
};
/* This function must be called with lock acquired. */
static int clk_master_div_set(struct clk_master *master,
unsigned long parent_rate, int div)
{
const struct clk_master_characteristics *characteristics =
master->characteristics;
unsigned long rate = parent_rate;
unsigned int max_div = 0, div_index = 0, max_div_index = 0;
unsigned int i, mckr, tmp;
int ret;
for (i = 0; i < ARRAY_SIZE(characteristics->divisors); i++) {
if (!characteristics->divisors[i])
break;
if (div == characteristics->divisors[i])
div_index = i;
if (max_div < characteristics->divisors[i]) {
max_div = characteristics->divisors[i];
max_div_index = i;
}
}
if (div > max_div)
div_index = max_div_index;
ret = regmap_read(master->regmap, master->layout->offset, &mckr);
if (ret)
return ret;
mckr &= master->layout->mask;
tmp = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
if (tmp == div_index)
return 0;
rate /= characteristics->divisors[div_index];
if (rate < characteristics->output.min)
pr_warn("master clk div is underclocked");
else if (rate > characteristics->output.max)
pr_warn("master clk div is overclocked");
mckr &= ~(MASTER_DIV_MASK << MASTER_DIV_SHIFT);
mckr |= (div_index << MASTER_DIV_SHIFT);
ret = regmap_write(master->regmap, master->layout->offset, mckr);
if (ret)
return ret;
while (!clk_master_ready(master))
cpu_relax();
master->div = characteristics->divisors[div_index];
return 0;
}
static unsigned long clk_master_div_recalc_rate_chg(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_master *master = to_clk_master(hw);
return DIV_ROUND_CLOSEST_ULL(parent_rate, master->div);
}
static void clk_master_div_restore_context_chg(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
int ret;
spin_lock_irqsave(master->lock, flags);
ret = clk_master_div_set(master, master->pms.parent_rate,
DIV_ROUND_CLOSEST(master->pms.parent_rate,
master->pms.rate));
spin_unlock_irqrestore(master->lock, flags);
if (ret)
pr_warn("Failed to restore MCK DIV clock\n");
}
static const struct clk_ops master_div_ops_chg = {
.prepare = clk_master_prepare,
.is_prepared = clk_master_is_prepared,
.recalc_rate = clk_master_div_recalc_rate_chg,
.save_context = clk_master_div_save_context,
.restore_context = clk_master_div_restore_context_chg,
};
static int clk_master_div_notifier_fn(struct notifier_block *notifier,
unsigned long code, void *data)
{
const struct clk_master_characteristics *characteristics =
master_div->characteristics;
struct clk_notifier_data *cnd = data;
unsigned long flags, new_parent_rate, new_rate;
unsigned int mckr, div, new_div = 0;
int ret, i;
long tmp_diff;
long best_diff = -1;
spin_lock_irqsave(master_div->lock, flags);
switch (code) {
case PRE_RATE_CHANGE:
/*
* We want to avoid any overclocking of MCK DIV domain. To do
* this we set a safe divider (the underclocking is not of
* interest as we can go as low as 32KHz). The relation
* b/w this clock and its parents are as follows:
*
* FRAC PLL -> DIV PLL -> MCK DIV
*
* With the proper safe divider we should be good even with FRAC
* PLL at its maximum value.
*/
ret = regmap_read(master_div->regmap, master_div->layout->offset,
&mckr);
if (ret) {
ret = NOTIFY_STOP_MASK;
goto unlock;
}
mckr &= master_div->layout->mask;
div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
/* Switch to safe divider. */
clk_master_div_set(master_div,
cnd->old_rate * characteristics->divisors[div],
master_div->safe_div);
break;
case POST_RATE_CHANGE:
/*
* At this point we want to restore MCK DIV domain to its maximum
* allowed rate.
*/
ret = regmap_read(master_div->regmap, master_div->layout->offset,
&mckr);
if (ret) {
ret = NOTIFY_STOP_MASK;
goto unlock;
}
mckr &= master_div->layout->mask;
div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
new_parent_rate = cnd->new_rate * characteristics->divisors[div];
for (i = 0; i < ARRAY_SIZE(characteristics->divisors); i++) {
if (!characteristics->divisors[i])
break;
new_rate = DIV_ROUND_CLOSEST_ULL(new_parent_rate,
characteristics->divisors[i]);
tmp_diff = characteristics->output.max - new_rate;
if (tmp_diff < 0)
continue;
if (best_diff < 0 || best_diff > tmp_diff) {
new_div = characteristics->divisors[i];
best_diff = tmp_diff;
}
if (!tmp_diff)
break;
}
if (!new_div) {
ret = NOTIFY_STOP_MASK;
goto unlock;
}
/* Update the div to preserve MCK DIV clock rate. */
clk_master_div_set(master_div, new_parent_rate,
new_div);
ret = NOTIFY_OK;
break;
default:
ret = NOTIFY_DONE;
break;
}
unlock:
spin_unlock_irqrestore(master_div->lock, flags);
return ret;
}
static struct notifier_block clk_master_div_notifier = {
.notifier_call = clk_master_div_notifier_fn,
};
static void clk_sama7g5_master_best_diff(struct clk_rate_request *req,
struct clk_hw *parent,
unsigned long parent_rate,
long *best_rate,
long *best_diff,
u32 div)
{
unsigned long tmp_rate, tmp_diff;
if (div == MASTER_PRES_MAX)
tmp_rate = parent_rate / 3;
else
tmp_rate = parent_rate >> div;
tmp_diff = abs(req->rate - tmp_rate);
if (*best_diff < 0 || *best_diff >= tmp_diff) {
*best_rate = tmp_rate;
*best_diff = tmp_diff;
req->best_parent_rate = parent_rate;
req->best_parent_hw = parent;
}
}
static unsigned long clk_master_pres_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_master *master = to_clk_master(hw);
const struct clk_master_characteristics *characteristics =
master->characteristics;
unsigned long flags;
unsigned int val, pres;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &val);
spin_unlock_irqrestore(master->lock, flags);
val &= master->layout->mask;
pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
if (pres == MASTER_PRES_MAX && characteristics->have_div3_pres)
pres = 3;
else
pres = (1 << pres);
return DIV_ROUND_CLOSEST_ULL(parent_rate, pres);
}
static u8 clk_master_pres_get_parent(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
unsigned int mckr;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &mckr);
spin_unlock_irqrestore(master->lock, flags);
mckr &= master->layout->mask;
return mckr & AT91_PMC_CSS;
}
static int clk_master_pres_save_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
struct clk_hw *parent_hw = clk_hw_get_parent(hw);
unsigned long flags;
unsigned int val, pres;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &val);
spin_unlock_irqrestore(master->lock, flags);
val &= master->layout->mask;
pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
if (pres == MASTER_PRES_MAX && master->characteristics->have_div3_pres)
pres = 3;
else
pres = (1 << pres);
master->pms.parent = val & AT91_PMC_CSS;
master->pms.parent_rate = clk_hw_get_rate(parent_hw);
master->pms.rate = DIV_ROUND_CLOSEST_ULL(master->pms.parent_rate, pres);
return 0;
}
static void clk_master_pres_restore_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
unsigned int val, pres;
spin_lock_irqsave(master->lock, flags);
regmap_read(master->regmap, master->layout->offset, &val);
spin_unlock_irqrestore(master->lock, flags);
val &= master->layout->mask;
pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
if (pres == MASTER_PRES_MAX && master->characteristics->have_div3_pres)
pres = 3;
else
pres = (1 << pres);
if (master->pms.rate !=
DIV_ROUND_CLOSEST_ULL(master->pms.parent_rate, pres) ||
(master->pms.parent != (val & AT91_PMC_CSS)))
pr_warn("MCKR PRES was not configured properly by firmware!\n");
}
static const struct clk_ops master_pres_ops = {
.prepare = clk_master_prepare,
.is_prepared = clk_master_is_prepared,
.recalc_rate = clk_master_pres_recalc_rate,
.get_parent = clk_master_pres_get_parent,
.save_context = clk_master_pres_save_context,
.restore_context = clk_master_pres_restore_context,
};
static struct clk_hw * __init
at91_clk_register_master_internal(struct regmap *regmap,
const char *name, int num_parents,
const char **parent_names,
const struct clk_master_layout *layout,
const struct clk_master_characteristics *characteristics,
const struct clk_ops *ops, spinlock_t *lock, u32 flags)
{
struct clk_master *master;
struct clk_init_data init;
struct clk_hw *hw;
unsigned int mckr;
unsigned long irqflags;
int ret;
if (!name || !num_parents || !parent_names || !lock)
return ERR_PTR(-EINVAL);
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = ops;
init.parent_names = parent_names;
init.num_parents = num_parents;
init.flags = flags;
master->hw.init = &init;
master->layout = layout;
master->characteristics = characteristics;
master->regmap = regmap;
master->lock = lock;
if (ops == &master_div_ops_chg) {
spin_lock_irqsave(master->lock, irqflags);
regmap_read(master->regmap, master->layout->offset, &mckr);
spin_unlock_irqrestore(master->lock, irqflags);
mckr &= layout->mask;
mckr = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
master->div = characteristics->divisors[mckr];
}
hw = &master->hw;
ret = clk_hw_register(NULL, &master->hw);
if (ret) {
kfree(master);
hw = ERR_PTR(ret);
}
return hw;
}
struct clk_hw * __init
at91_clk_register_master_pres(struct regmap *regmap,
const char *name, int num_parents,
const char **parent_names,
const struct clk_master_layout *layout,
const struct clk_master_characteristics *characteristics,
spinlock_t *lock)
{
return at91_clk_register_master_internal(regmap, name, num_parents,
parent_names, layout,
characteristics,
&master_pres_ops,
lock, CLK_SET_RATE_GATE);
}
struct clk_hw * __init
at91_clk_register_master_div(struct regmap *regmap,
const char *name, const char *parent_name,
const struct clk_master_layout *layout,
const struct clk_master_characteristics *characteristics,
spinlock_t *lock, u32 flags, u32 safe_div)
{
const struct clk_ops *ops;
struct clk_hw *hw;
if (flags & CLK_SET_RATE_GATE)
ops = &master_div_ops;
else
ops = &master_div_ops_chg;
hw = at91_clk_register_master_internal(regmap, name, 1,
&parent_name, layout,
characteristics, ops,
lock, flags);
if (!IS_ERR(hw) && safe_div) {
master_div = to_clk_master(hw);
master_div->safe_div = safe_div;
clk_notifier_register(hw->clk,
&clk_master_div_notifier);
}
return hw;
}
static unsigned long
clk_sama7g5_master_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_master *master = to_clk_master(hw);
return DIV_ROUND_CLOSEST_ULL(parent_rate, (1 << master->div));
}
static int clk_sama7g5_master_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct clk_master *master = to_clk_master(hw);
struct clk_hw *parent;
long best_rate = LONG_MIN, best_diff = LONG_MIN;
unsigned long parent_rate;
unsigned int div, i;
/* First: check the dividers of MCR. */
for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
parent = clk_hw_get_parent_by_index(hw, i);
if (!parent)
continue;
parent_rate = clk_hw_get_rate(parent);
if (!parent_rate)
continue;
for (div = 0; div < MASTER_PRES_MAX + 1; div++) {
clk_sama7g5_master_best_diff(req, parent, parent_rate,
&best_rate, &best_diff,
div);
if (!best_diff)
break;
}
if (!best_diff)
break;
}
/* Second: try to request rate form changeable parent. */
if (master->chg_pid < 0)
goto end;
parent = clk_hw_get_parent_by_index(hw, master->chg_pid);
if (!parent)
goto end;
for (div = 0; div < MASTER_PRES_MAX + 1; div++) {
struct clk_rate_request req_parent;
unsigned long req_rate;
if (div == MASTER_PRES_MAX)
req_rate = req->rate * 3;
else
req_rate = req->rate << div;
clk_hw_forward_rate_request(hw, req, parent, &req_parent, req_rate);
if (__clk_determine_rate(parent, &req_parent))
continue;
clk_sama7g5_master_best_diff(req, parent, req_parent.rate,
&best_rate, &best_diff, div);
if (!best_diff)
break;
}
end:
pr_debug("MCK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
__func__, best_rate,
__clk_get_name((req->best_parent_hw)->clk),
req->best_parent_rate);
if (best_rate < 0)
return -EINVAL;
req->rate = best_rate;
return 0;
}
static u8 clk_sama7g5_master_get_parent(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
u8 index;
spin_lock_irqsave(master->lock, flags);
index = clk_mux_val_to_index(&master->hw, master->mux_table, 0,
master->parent);
spin_unlock_irqrestore(master->lock, flags);
return index;
}
static int clk_sama7g5_master_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
if (index >= clk_hw_get_num_parents(hw))
return -EINVAL;
spin_lock_irqsave(master->lock, flags);
master->parent = clk_mux_index_to_val(master->mux_table, 0, index);
spin_unlock_irqrestore(master->lock, flags);
return 0;
}
static void clk_sama7g5_master_set(struct clk_master *master,
unsigned int status)
{
unsigned long flags;
unsigned int val, cparent;
unsigned int enable = status ? AT91_PMC_MCR_V2_EN : 0;
unsigned int parent = master->parent << PMC_MCR_CSS_SHIFT;
unsigned int div = master->div << MASTER_DIV_SHIFT;
spin_lock_irqsave(master->lock, flags);
regmap_write(master->regmap, AT91_PMC_MCR_V2,
AT91_PMC_MCR_V2_ID(master->id));
regmap_read(master->regmap, AT91_PMC_MCR_V2, &val);
regmap_update_bits(master->regmap, AT91_PMC_MCR_V2,
enable | AT91_PMC_MCR_V2_CSS | AT91_PMC_MCR_V2_DIV |
AT91_PMC_MCR_V2_CMD | AT91_PMC_MCR_V2_ID_MSK,
enable | parent | div | AT91_PMC_MCR_V2_CMD |
AT91_PMC_MCR_V2_ID(master->id));
cparent = (val & AT91_PMC_MCR_V2_CSS) >> PMC_MCR_CSS_SHIFT;
/* Wait here only if parent is being changed. */
while ((cparent != master->parent) && !clk_master_ready(master))
cpu_relax();
spin_unlock_irqrestore(master->lock, flags);
}
static int clk_sama7g5_master_enable(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
clk_sama7g5_master_set(master, 1);
return 0;
}
static void clk_sama7g5_master_disable(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
spin_lock_irqsave(master->lock, flags);
regmap_write(master->regmap, AT91_PMC_MCR_V2, master->id);
regmap_update_bits(master->regmap, AT91_PMC_MCR_V2,
AT91_PMC_MCR_V2_EN | AT91_PMC_MCR_V2_CMD |
AT91_PMC_MCR_V2_ID_MSK,
AT91_PMC_MCR_V2_CMD |
AT91_PMC_MCR_V2_ID(master->id));
spin_unlock_irqrestore(master->lock, flags);
}
static int clk_sama7g5_master_is_enabled(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
unsigned long flags;
unsigned int val;
spin_lock_irqsave(master->lock, flags);
regmap_write(master->regmap, AT91_PMC_MCR_V2, master->id);
regmap_read(master->regmap, AT91_PMC_MCR_V2, &val);
spin_unlock_irqrestore(master->lock, flags);
return !!(val & AT91_PMC_MCR_V2_EN);
}
static int clk_sama7g5_master_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_master *master = to_clk_master(hw);
unsigned long div, flags;
div = DIV_ROUND_CLOSEST(parent_rate, rate);
if ((div > (1 << (MASTER_PRES_MAX - 1))) || (div & (div - 1)))
return -EINVAL;
if (div == 3)
div = MASTER_PRES_MAX;
else if (div)
div = ffs(div) - 1;
spin_lock_irqsave(master->lock, flags);
master->div = div;
spin_unlock_irqrestore(master->lock, flags);
return 0;
}
static int clk_sama7g5_master_save_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
master->pms.status = clk_sama7g5_master_is_enabled(hw);
return 0;
}
static void clk_sama7g5_master_restore_context(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
if (master->pms.status)
clk_sama7g5_master_set(master, master->pms.status);
}
static const struct clk_ops sama7g5_master_ops = {
.enable = clk_sama7g5_master_enable,
.disable = clk_sama7g5_master_disable,
.is_enabled = clk_sama7g5_master_is_enabled,
.recalc_rate = clk_sama7g5_master_recalc_rate,
.determine_rate = clk_sama7g5_master_determine_rate,
.set_rate = clk_sama7g5_master_set_rate,
.get_parent = clk_sama7g5_master_get_parent,
.set_parent = clk_sama7g5_master_set_parent,
.save_context = clk_sama7g5_master_save_context,
.restore_context = clk_sama7g5_master_restore_context,
};
struct clk_hw * __init
at91_clk_sama7g5_register_master(struct regmap *regmap,
const char *name, int num_parents,
const char **parent_names,
u32 *mux_table,
spinlock_t *lock, u8 id,
bool critical, int chg_pid)
{
struct clk_master *master;
struct clk_hw *hw;
struct clk_init_data init;
unsigned long flags;
unsigned int val;
int ret;
if (!name || !num_parents || !parent_names || !mux_table ||
!lock || id > MASTER_MAX_ID)
return ERR_PTR(-EINVAL);
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &sama7g5_master_ops;
init.parent_names = parent_names;
init.num_parents = num_parents;
init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
if (chg_pid >= 0)
init.flags |= CLK_SET_RATE_PARENT;
if (critical)
init.flags |= CLK_IS_CRITICAL;
master->hw.init = &init;
master->regmap = regmap;
master->id = id;
master->chg_pid = chg_pid;
master->lock = lock;
master->mux_table = mux_table;
spin_lock_irqsave(master->lock, flags);
regmap_write(master->regmap, AT91_PMC_MCR_V2, master->id);
regmap_read(master->regmap, AT91_PMC_MCR_V2, &val);
master->parent = (val & AT91_PMC_MCR_V2_CSS) >> PMC_MCR_CSS_SHIFT;
master->div = (val & AT91_PMC_MCR_V2_DIV) >> MASTER_DIV_SHIFT;
spin_unlock_irqrestore(master->lock, flags);
hw = &master->hw;
ret = clk_hw_register(NULL, &master->hw);
if (ret) {
kfree(master);
hw = ERR_PTR(ret);
}
return hw;
}
const struct clk_master_layout at91rm9200_master_layout = {
.mask = 0x31F,
.pres_shift = 2,
.offset = AT91_PMC_MCKR,
};
const struct clk_master_layout at91sam9x5_master_layout = {
.mask = 0x373,
.pres_shift = 4,
.offset = AT91_PMC_MCKR,
};