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drivers: pinctrl: stm32: fix MAPR remap

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- Move SWJ_CFG initialization into pinctrl.
- Don't disable the AFIO clock after SWJ_CFG
  initialization.
- Apply '111' to the SWJ_CFG bits upon remap
  application, that fixes the remap usage.

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
This commit is contained in:
Georgij Cernysiov 2022-03-09 15:20:21 +01:00 • committed by Carles Cufí
commit e17c42bd42
1 changed files with 42 additions and 11 deletions
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53
drivers/pinctrl/pinctrl_stm32.c
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@ -87,6 +87,39 @@ SYS_INIT(stm32_pinmux_init_remap, PRE_KERNEL_1,
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_pinctrl)
/* ignore swj-cfg reset state (default value) */
#if ((DT_NODE_HAS_PROP(DT_NODELABEL(pinctrl), swj_cfg)) && \
(DT_ENUM_IDX(DT_NODELABEL(pinctrl), swj_cfg) != 0))
static int stm32f1_swj_cfg_init(const struct device *dev)
{
ARG_UNUSED(dev);
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
/* reset state is '000' (Full SWJ, (JTAG-DP + SW-DP)) */
/* only one of the 3 bits can be set */
#if (DT_ENUM_IDX(DT_NODELABEL(pinctrl), swj_cfg) == 1)
/* 001: Full SWJ (JTAG-DP + SW-DP) but without NJTRST */
/* releases: PB4 */
LL_GPIO_AF_Remap_SWJ_NONJTRST();
#elif (DT_ENUM_IDX(DT_NODELABEL(pinctrl), swj_cfg) == 2)
/* 010: JTAG-DP Disabled and SW-DP Enabled */
/* releases: PB4 PB3 PA15 */
LL_GPIO_AF_Remap_SWJ_NOJTAG();
#elif (DT_ENUM_IDX(DT_NODELABEL(pinctrl), swj_cfg) == 3)
/* 100: JTAG-DP Disabled and SW-DP Disabled */
/* releases: PB4 PB3 PA13 PA14 PA15 */
LL_GPIO_AF_DisableRemap_SWJ();
#endif
return 0;
}
SYS_INIT(stm32f1_swj_cfg_init, PRE_KERNEL_1, 0);
#endif /* DT_NODE_HAS_PROP(DT_NODELABEL(pinctrl), swj_cfg) */
/**
* @brief Helper function to check and apply provided pinctrl remap
* configuration.
@ -102,9 +135,7 @@ SYS_INIT(stm32_pinmux_init_remap, PRE_KERNEL_1,
*/
static int stm32_pins_remap(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt)
{
uint8_t pos;
uint32_t reg_val;
volatile uint32_t *reg;
uint16_t remap;
remap = (uint16_t)STM32_DT_PINMUX_REMAP(pins[0].pinmux);
@ -125,18 +156,18 @@ static int stm32_pins_remap(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt)
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
if (STM32_REMAP_REG_GET(remap) == 0U) {
reg = &AFIO->MAPR;
/* read initial value, ignore write-only SWJ_CFG */
reg_val = AFIO->MAPR & ~AFIO_MAPR_SWJ_CFG;
reg_val |= STM32_REMAP_VAL_GET(remap) << STM32_REMAP_SHIFT_GET(remap);
/* apply undocumented '111' (AFIO_MAPR_SWJ_CFG) to affirm SWJ_CFG */
/* the pins are not remapped without that (when SWJ_CFG is not default) */
AFIO->MAPR = reg_val | AFIO_MAPR_SWJ_CFG;
} else {
reg = &AFIO->MAPR2;
reg_val = AFIO->MAPR2;
reg_val |= STM32_REMAP_VAL_GET(remap) << STM32_REMAP_SHIFT_GET(remap);
AFIO->MAPR2 = reg_val;
}
pos = STM32_REMAP_SHIFT_GET(remap);
reg_val = *reg;
reg_val &= ~(STM32_REMAP_MASK_GET(remap) << pos);
reg_val |= STM32_REMAP_VAL_GET(remap) << pos;
*reg = reg_val;
return 0;
}