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i2c: stm32: Add cache memory support

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Add basic cache memory support

Signed-off-by: Simon Gilbert <srdgilbert@gmail.com>
This commit is contained in:
Simon Gilbert 2024-12-31 16:57:03 +00:00 committed by Carles Cufí
parent 26a8b36513
commit 42c3a78148
1 changed files with 52 additions and 0 deletions
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52
drivers/i2c/i2c_ll_stm32_v2.c
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@ -21,6 +21,13 @@
#include <zephyr/pm/device_runtime.h>
#include "i2c_ll_stm32.h"
#ifdef CONFIG_DCACHE
#include <zephyr/cache.h>
#include <zephyr/linker/linker-defs.h>
#include <zephyr/mem_mgmt/mem_attr.h>
#include <zephyr/dt-bindings/memory-attr/memory-attr-arm.h>
#endif /* CONFIG_DCACHE */
#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(i2c_ll_stm32_v2);
@ -676,6 +683,35 @@ void stm32_i2c_error_isr(void *arg)
}
#endif
#ifdef CONFIG_DCACHE
static bool buf_in_nocache(uintptr_t buf, size_t len_bytes)
{
bool buf_within_nocache = false;
#ifdef CONFIG_NOCACHE_MEMORY
/* Check if buffer is in nocache region defined by the linker */
buf_within_nocache = (buf >= ((uintptr_t)_nocache_ram_start)) &&
((buf + len_bytes - 1) <= ((uintptr_t)_nocache_ram_end));
if (buf_within_nocache) {
return true;
}
#endif /* CONFIG_NOCACHE_MEMORY */
/* Check if buffer is in nocache memory region defined in DT */
buf_within_nocache = mem_attr_check_buf(
(void *)buf, len_bytes, DT_MEM_ARM(ATTR_MPU_RAM_NOCACHE)) == 0;
if (buf_within_nocache) {
return true;
}
/* Check if buffer is in RO region (Flash..) */
buf_within_nocache = (buf >= ((uintptr_t)__rodata_region_start)) &&
((buf + len_bytes - 1) <= ((uintptr_t)__rodata_region_end));
return buf_within_nocache;
}
#endif /* CONFIG_DCACHE */
static int stm32_i2c_msg_write(const struct device *dev, struct i2c_msg *msg,
uint8_t *next_msg_flags, uint16_t slave)
{
@ -691,6 +727,14 @@ static int stm32_i2c_msg_write(const struct device *dev, struct i2c_msg *msg,
data->current.is_err = 0U;
data->current.msg = msg;
#ifdef CONFIG_DCACHE
if (!buf_in_nocache((uintptr_t)msg->buf, msg->len)) {
LOG_DBG("Tx buffer at %p (len %zu) is in cached memory; cleaning cache", msg->buf,
msg->len);
sys_cache_data_flush_range((void *)msg->buf, msg->len);
}
#endif /* CONFIG_DCACHE */
msg_init(dev, msg, next_msg_flags, slave, LL_I2C_REQUEST_WRITE);
stm32_i2c_enable_transfer_interrupts(dev);
@ -762,6 +806,14 @@ static int stm32_i2c_msg_read(const struct device *dev, struct i2c_msg *msg,
is_timeout = true;
}
#ifdef CONFIG_DCACHE
if (!buf_in_nocache((uintptr_t)msg->buf, msg->len)) {
LOG_DBG("Rx buffer at %p (len %zu) is in cached memory; invalidating cache",
msg->buf, msg->len);
sys_cache_data_invd_range((void *)msg->buf, msg->len);
}
#endif /* CONFIG_DCACHE */
if (data->current.is_nack || data->current.is_err ||
data->current.is_arlo || is_timeout) {
goto error;