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path: root/drivers/clk/at91/clk-master.c
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Diffstat (limited to 'drivers/clk/at91/clk-master.c')
-rw-r--r--drivers/clk/at91/clk-master.c98
1 files changed, 39 insertions, 59 deletions
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 620ea323356b..d1021e106191 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -12,13 +12,8 @@
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include "pmc.h"
@@ -44,32 +39,26 @@ struct clk_master_layout {
struct clk_master {
struct clk_hw hw;
- struct at91_pmc *pmc;
- unsigned int irq;
- wait_queue_head_t wait;
+ struct regmap *regmap;
const struct clk_master_layout *layout;
const struct clk_master_characteristics *characteristics;
};
-static irqreturn_t clk_master_irq_handler(int irq, void *dev_id)
+static inline bool clk_master_ready(struct regmap *regmap)
{
- struct clk_master *master = (struct clk_master *)dev_id;
+ unsigned int status;
- wake_up(&master->wait);
- disable_irq_nosync(master->irq);
+ regmap_read(regmap, AT91_PMC_SR, &status);
- return IRQ_HANDLED;
+ return status & AT91_PMC_MCKRDY ? 1 : 0;
}
+
static int clk_master_prepare(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
- struct at91_pmc *pmc = master->pmc;
- while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY)) {
- enable_irq(master->irq);
- wait_event(master->wait,
- pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
- }
+ while (!clk_master_ready(master->regmap))
+ cpu_relax();
return 0;
}
@@ -78,7 +67,7 @@ static int clk_master_is_prepared(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
- return !!(pmc_read(master->pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
+ return clk_master_ready(master->regmap);
}
static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
@@ -88,18 +77,16 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
u8 div;
unsigned long rate = parent_rate;
struct clk_master *master = to_clk_master(hw);
- struct at91_pmc *pmc = master->pmc;
const struct clk_master_layout *layout = master->layout;
const struct clk_master_characteristics *characteristics =
master->characteristics;
- u32 tmp;
+ unsigned int mckr;
- pmc_lock(pmc);
- tmp = pmc_read(pmc, AT91_PMC_MCKR) & layout->mask;
- pmc_unlock(pmc);
+ regmap_read(master->regmap, AT91_PMC_MCKR, &mckr);
+ mckr &= layout->mask;
- pres = (tmp >> layout->pres_shift) & MASTER_PRES_MASK;
- div = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+ pres = (mckr >> layout->pres_shift) & MASTER_PRES_MASK;
+ div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
if (characteristics->have_div3_pres && pres == MASTER_PRES_MAX)
rate /= 3;
@@ -119,9 +106,11 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
static u8 clk_master_get_parent(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
- struct at91_pmc *pmc = master->pmc;
+ unsigned int mckr;
- return pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_CSS;
+ regmap_read(master->regmap, AT91_PMC_MCKR, &mckr);
+
+ return mckr & AT91_PMC_CSS;
}
static const struct clk_ops master_ops = {
@@ -132,18 +121,17 @@ static const struct clk_ops master_ops = {
};
static struct clk * __init
-at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
+at91_clk_register_master(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)
{
- int ret;
struct clk_master *master;
struct clk *clk = NULL;
struct clk_init_data init;
- if (!pmc || !irq || !name || !num_parents || !parent_names)
+ if (!name || !num_parents || !parent_names)
return ERR_PTR(-EINVAL);
master = kzalloc(sizeof(*master), GFP_KERNEL);
@@ -159,20 +147,10 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
master->hw.init = &init;
master->layout = layout;
master->characteristics = characteristics;
- master->pmc = pmc;
- master->irq = irq;
- init_waitqueue_head(&master->wait);
- irq_set_status_flags(master->irq, IRQ_NOAUTOEN);
- ret = request_irq(master->irq, clk_master_irq_handler,
- IRQF_TRIGGER_HIGH, "clk-master", master);
- if (ret) {
- kfree(master);
- return ERR_PTR(ret);
- }
+ master->regmap = regmap;
clk = clk_register(NULL, &master->hw);
if (IS_ERR(clk)) {
- free_irq(master->irq, master);
kfree(master);
}
@@ -217,18 +195,18 @@ out_free_characteristics:
}
static void __init
-of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
+of_at91_clk_master_setup(struct device_node *np,
const struct clk_master_layout *layout)
{
struct clk *clk;
- int num_parents;
- unsigned int irq;
+ unsigned int num_parents;
const char *parent_names[MASTER_SOURCE_MAX];
const char *name = np->name;
struct clk_master_characteristics *characteristics;
+ struct regmap *regmap;
num_parents = of_clk_get_parent_count(np);
- if (num_parents <= 0 || num_parents > MASTER_SOURCE_MAX)
+ if (num_parents == 0 || num_parents > MASTER_SOURCE_MAX)
return;
of_clk_parent_fill(np, parent_names, num_parents);
@@ -239,11 +217,11 @@ of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
if (!characteristics)
return;
- irq = irq_of_parse_and_map(np, 0);
- if (!irq)
- goto out_free_characteristics;
+ regmap = syscon_node_to_regmap(of_get_parent(np));
+ if (IS_ERR(regmap))
+ return;
- clk = at91_clk_register_master(pmc, irq, name, num_parents,
+ clk = at91_clk_register_master(regmap, name, num_parents,
parent_names, layout,
characteristics);
if (IS_ERR(clk))
@@ -256,14 +234,16 @@ out_free_characteristics:
kfree(characteristics);
}
-void __init of_at91rm9200_clk_master_setup(struct device_node *np,
- struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_master_setup(struct device_node *np)
{
- of_at91_clk_master_setup(np, pmc, &at91rm9200_master_layout);
+ of_at91_clk_master_setup(np, &at91rm9200_master_layout);
}
+CLK_OF_DECLARE(at91rm9200_clk_master, "atmel,at91rm9200-clk-master",
+ of_at91rm9200_clk_master_setup);
-void __init of_at91sam9x5_clk_master_setup(struct device_node *np,
- struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_master_setup(struct device_node *np)
{
- of_at91_clk_master_setup(np, pmc, &at91sam9x5_master_layout);
+ of_at91_clk_master_setup(np, &at91sam9x5_master_layout);
}
+CLK_OF_DECLARE(at91sam9x5_clk_master, "atmel,at91sam9x5-clk-master",
+ of_at91sam9x5_clk_master_setup);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.