[PATCH v2 2/5] clk: stm32mp1: use stm32mp13 reset driver

From: gabriel.fernandez
Date: Thu Nov 16 2023 - 10:54:33 EST

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From: Gabriel Fernandez <gabriel.fernandez@xxxxxxxxxxx>

STM32MP15 is now using the same reset driver as STM32MP13 as they
have the same binding requirement.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@xxxxxxxxxxx>
---
drivers/clk/stm32/Makefile | 2 +-
drivers/clk/stm32/clk-stm32-core.c | 5 +-
drivers/clk/stm32/clk-stm32-core.h | 5 +-
drivers/clk/stm32/clk-stm32mp1.c | 127 ++++-------------------------
drivers/clk/stm32/clk-stm32mp13.c | 9 +-
drivers/clk/stm32/reset-stm32.c | 14 ++--
drivers/clk/stm32/reset-stm32.h | 8 +-
7 files changed, 42 insertions(+), 128 deletions(-)

diff --git a/drivers/clk/stm32/Makefile b/drivers/clk/stm32/Makefile
index c154ef3e88f9..5ced7fe3ddec 100644
--- a/drivers/clk/stm32/Makefile
+++ b/drivers/clk/stm32/Makefile
@@ -1,2 +1,2 @@
obj-$(CONFIG_COMMON_CLK_STM32MP135) += clk-stm32mp13.o clk-stm32-core.o reset-stm32.o
-obj-$(CONFIG_COMMON_CLK_STM32MP157) += clk-stm32mp1.o
+obj-$(CONFIG_COMMON_CLK_STM32MP157) += clk-stm32mp1.o reset-stm32.o
diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
index 067b918a8894..58705fcad334 100644
--- a/drivers/clk/stm32/clk-stm32-core.c
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -70,6 +70,7 @@ static int stm32_rcc_clock_init(struct device *dev,
int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data,
void __iomem *base)
{
+ const struct stm32_rcc_match_data *rcc_match_data;
const struct of_device_id *match;
int err;

@@ -79,8 +80,10 @@ int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data,
return -ENODEV;
}

+ rcc_match_data = match->data;
+
/* RCC Reset Configuration */
- err = stm32_rcc_reset_init(dev, match, base);
+ err = stm32_rcc_reset_init(dev, rcc_match_data->reset_data, base);
if (err) {
pr_err("stm32 reset failed to initialize\n");
return err;
diff --git a/drivers/clk/stm32/clk-stm32-core.h b/drivers/clk/stm32/clk-stm32-core.h
index 76cffda02308..bb5aa19a792d 100644
--- a/drivers/clk/stm32/clk-stm32-core.h
+++ b/drivers/clk/stm32/clk-stm32-core.h
@@ -70,15 +70,12 @@ struct stm32_rcc_match_data {
const struct clock_config *tab_clocks;
unsigned int maxbinding;
struct clk_stm32_clock_data *clock_data;
- u32 clear_offset;
+ struct clk_stm32_reset_data *reset_data;
int (*check_security)(void __iomem *base,
const struct clock_config *cfg);
int (*multi_mux)(void __iomem *base, const struct clock_config *cfg);
};

-int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match,
- void __iomem *base);
-
int stm32_rcc_init(struct device *dev, const struct of_device_id *match_data,
void __iomem *base);

diff --git a/drivers/clk/stm32/clk-stm32mp1.c b/drivers/clk/stm32/clk-stm32mp1.c
index 939779f66867..c7cbd3488aab 100644
--- a/drivers/clk/stm32/clk-stm32mp1.c
+++ b/drivers/clk/stm32/clk-stm32mp1.c
@@ -20,6 +20,10 @@

#include <dt-bindings/clock/stm32mp1-clks.h>

+#include "reset-stm32.h"
+
+#define STM32MP1_RESET_ID_MASK GENMASK(15, 0)
+
static DEFINE_SPINLOCK(rlock);

#define RCC_OCENSETR 0x0C
@@ -2137,22 +2141,27 @@ struct stm32_rcc_match_data {
const struct clock_config *cfg;
unsigned int num;
unsigned int maxbinding;
- u32 clear_offset;
+ struct clk_stm32_reset_data *reset_data;
bool (*check_security)(const struct clock_config *cfg);
};

+struct clk_stm32_reset_data stm32mp1_reset_data = {
+ .nr_lines = STM32MP1_RESET_ID_MASK,
+ .clear_offset = RCC_CLR,
+};
+
static struct stm32_rcc_match_data stm32mp1_data = {
.cfg = stm32mp1_clock_cfg,
.num = ARRAY_SIZE(stm32mp1_clock_cfg),
.maxbinding = STM32MP1_LAST_CLK,
- .clear_offset = RCC_CLR,
+ .reset_data = &stm32mp1_reset_data,
};

static struct stm32_rcc_match_data stm32mp1_data_secure = {
.cfg = stm32mp1_clock_cfg,
.num = ARRAY_SIZE(stm32mp1_clock_cfg),
.maxbinding = STM32MP1_LAST_CLK,
- .clear_offset = RCC_CLR,
+ .reset_data = &stm32mp1_reset_data,
.check_security = &stm32_check_security
};

@@ -2193,113 +2202,6 @@ static int stm32_register_hw_clk(struct device *dev,
return 0;
}

-#define STM32_RESET_ID_MASK GENMASK(15, 0)
-
-struct stm32_reset_data {
- /* reset lock */
- spinlock_t lock;
- struct reset_controller_dev rcdev;
- void __iomem *membase;
- u32 clear_offset;
-};
-
-static inline struct stm32_reset_data *
-to_stm32_reset_data(struct reset_controller_dev *rcdev)
-{
- return container_of(rcdev, struct stm32_reset_data, rcdev);
-}
-
-static int stm32_reset_update(struct reset_controller_dev *rcdev,
- unsigned long id, bool assert)
-{
- struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
- int reg_width = sizeof(u32);
- int bank = id / (reg_width * BITS_PER_BYTE);
- int offset = id % (reg_width * BITS_PER_BYTE);
-
- if (data->clear_offset) {
- void __iomem *addr;
-
- addr = data->membase + (bank * reg_width);
- if (!assert)
- addr += data->clear_offset;
-
- writel(BIT(offset), addr);
-
- } else {
- unsigned long flags;
- u32 reg;
-
- spin_lock_irqsave(&data->lock, flags);
-
- reg = readl(data->membase + (bank * reg_width));
-
- if (assert)
- reg |= BIT(offset);
- else
- reg &= ~BIT(offset);
-
- writel(reg, data->membase + (bank * reg_width));
-
- spin_unlock_irqrestore(&data->lock, flags);
- }
-
- return 0;
-}
-
-static int stm32_reset_assert(struct reset_controller_dev *rcdev,
- unsigned long id)
-{
- return stm32_reset_update(rcdev, id, true);
-}
-
-static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
- unsigned long id)
-{
- return stm32_reset_update(rcdev, id, false);
-}
-
-static int stm32_reset_status(struct reset_controller_dev *rcdev,
- unsigned long id)
-{
- struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
- int reg_width = sizeof(u32);
- int bank = id / (reg_width * BITS_PER_BYTE);
- int offset = id % (reg_width * BITS_PER_BYTE);
- u32 reg;
-
- reg = readl(data->membase + (bank * reg_width));
-
- return !!(reg & BIT(offset));
-}
-
-static const struct reset_control_ops stm32_reset_ops = {
- .assert = stm32_reset_assert,
- .deassert = stm32_reset_deassert,
- .status = stm32_reset_status,
-};
-
-static int stm32_rcc_reset_init(struct device *dev, void __iomem *base,
- const struct of_device_id *match)
-{
- const struct stm32_rcc_match_data *data = match->data;
- struct stm32_reset_data *reset_data = NULL;
-
- reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
- if (!reset_data)
- return -ENOMEM;
-
- spin_lock_init(&reset_data->lock);
- reset_data->membase = base;
- reset_data->rcdev.owner = THIS_MODULE;
- reset_data->rcdev.ops = &stm32_reset_ops;
- reset_data->rcdev.of_node = dev_of_node(dev);
- reset_data->rcdev.nr_resets = STM32_RESET_ID_MASK;
- reset_data->clear_offset = data->clear_offset;
-
- return reset_controller_register(&reset_data->rcdev);
-}
-
static int stm32_rcc_clock_init(struct device *dev, void __iomem *base,
const struct of_device_id *match)
{
@@ -2342,6 +2244,7 @@ static int stm32_rcc_clock_init(struct device *dev, void __iomem *base,
static int stm32_rcc_init(struct device *dev, void __iomem *base,
const struct of_device_id *match_data)
{
+ const struct stm32_rcc_match_data *rcc_match_data;
const struct of_device_id *match;
int err;

@@ -2351,8 +2254,10 @@ static int stm32_rcc_init(struct device *dev, void __iomem *base,
return -ENODEV;
}

+ rcc_match_data = match->data;
+
/* RCC Reset Configuration */
- err = stm32_rcc_reset_init(dev, base, match);
+ err = stm32_rcc_reset_init(dev, rcc_match_data->reset_data, base);
if (err) {
pr_err("stm32mp1 reset failed to initialize\n");
return err;
diff --git a/drivers/clk/stm32/clk-stm32mp13.c b/drivers/clk/stm32/clk-stm32mp13.c
index c4a737482fe5..7a1f4003227f 100644
--- a/drivers/clk/stm32/clk-stm32mp13.c
+++ b/drivers/clk/stm32/clk-stm32mp13.c
@@ -10,8 +10,10 @@
#include <linux/platform_device.h>
#include <dt-bindings/clock/stm32mp13-clks.h>
#include "clk-stm32-core.h"
+#include "reset-stm32.h"
#include "stm32mp13_rcc.h"

+#define STM32MP1_RESET_ID_MASK GENMASK(15, 0)
#define RCC_CLR_OFFSET 0x4

/* STM32 Gates definition */
@@ -1511,13 +1513,18 @@ static struct clk_stm32_clock_data stm32mp13_clock_data = {
.is_multi_mux = stm32mp13_is_multi_mux,
};

+struct clk_stm32_reset_data stm32mp13_reset_data = {
+ .nr_lines = STM32MP1_RESET_ID_MASK,
+ .clear_offset = RCC_CLR_OFFSET,
+};
+
static const struct stm32_rcc_match_data stm32mp13_data = {
.tab_clocks = stm32mp13_clock_cfg,
.num_clocks = ARRAY_SIZE(stm32mp13_clock_cfg),
.clock_data = &stm32mp13_clock_data,
.check_security = &stm32mp13_clock_is_provided_by_secure,
.maxbinding = STM32MP1_LAST_CLK,
- .clear_offset = RCC_CLR_OFFSET,
+ .reset_data = &stm32mp13_reset_data,
};

static const struct of_device_id stm32mp13_match_data[] = {
diff --git a/drivers/clk/stm32/reset-stm32.c b/drivers/clk/stm32/reset-stm32.c
index e89381528af9..14c2ee1eebee 100644
--- a/drivers/clk/stm32/reset-stm32.c
+++ b/drivers/clk/stm32/reset-stm32.c
@@ -11,9 +11,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>

-#include "clk-stm32-core.h"
-
-#define STM32_RESET_ID_MASK GENMASK(15, 0)
+#include "reset-stm32.h"

struct stm32_reset_data {
/* reset lock */
@@ -99,24 +97,22 @@ static const struct reset_control_ops stm32_reset_ops = {
.status = stm32_reset_status,
};

-int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match,
+int stm32_rcc_reset_init(struct device *dev, struct clk_stm32_reset_data *data,
void __iomem *base)
{
- const struct stm32_rcc_match_data *data = match->data;
- struct stm32_reset_data *reset_data = NULL;
-
- data = match->data;
+ struct stm32_reset_data *reset_data;

reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
if (!reset_data)
return -ENOMEM;

spin_lock_init(&reset_data->lock);
+
reset_data->membase = base;
reset_data->rcdev.owner = THIS_MODULE;
reset_data->rcdev.ops = &stm32_reset_ops;
reset_data->rcdev.of_node = dev_of_node(dev);
- reset_data->rcdev.nr_resets = STM32_RESET_ID_MASK;
+ reset_data->rcdev.nr_resets = data->nr_lines;
reset_data->clear_offset = data->clear_offset;

return reset_controller_register(&reset_data->rcdev);
diff --git a/drivers/clk/stm32/reset-stm32.h b/drivers/clk/stm32/reset-stm32.h
index 6eb6ea4b55ab..8cf1cc9be480 100644
--- a/drivers/clk/stm32/reset-stm32.h
+++ b/drivers/clk/stm32/reset-stm32.h
@@ -4,5 +4,11 @@
* Author: Gabriel Fernandez <gabriel.fernandez@xxxxxxxxxxx> for STMicroelectronics.
*/

-int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match,
+struct clk_stm32_reset_data {
+ const struct reset_control_ops *ops;
+ unsigned int nr_lines;
+ u32 clear_offset;
+};
+
+int stm32_rcc_reset_init(struct device *dev, struct clk_stm32_reset_data *data,
void __iomem *base);
--
2.25.1

Next message: gabriel.fernandez: "[PATCH v2 3/5] dt-bindings: stm32: add clocks and reset binding for stm32mp25 platform"
Previous message: gabriel.fernandez: "[PATCH v2 0/5] Introduce STM32MP257 clock driver"
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