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drivers: memc: stm32: add support for st,mem-swap

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Implements H7 FMC binding memory remap
or swap configuration.

Enables:
* sdram-sram - swaps the NOR/PSRAM and SDRAM banks.
* sdramb2 - remaps SDRAM bank 2.

Does nothing for 'disabled' value (default mapping, reset state).

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
This commit is contained in:
Georgij Cernysiov 2022-04-01 11:14:13 +02:00 • committed by Carles Cufí
commit 2dca9d859a
1 changed files with 19 additions and 2 deletions
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21
drivers/memc/memc_stm32.c
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@ -4,9 +4,8 @@
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
*/ */
#define DT_DRV_COMPAT st_stm32_fmc
#include <device.h> #include <device.h>
#include <soc.h>
#include <drivers/clock_control/stm32_clock_control.h> #include <drivers/clock_control/stm32_clock_control.h>
#include <drivers/pinctrl.h> #include <drivers/pinctrl.h>
@ -14,6 +13,14 @@
#include <logging/log.h> #include <logging/log.h>
LOG_MODULE_REGISTER(memc_stm32, CONFIG_MEMC_LOG_LEVEL); LOG_MODULE_REGISTER(memc_stm32, CONFIG_MEMC_LOG_LEVEL);
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_fmc)
#define DT_DRV_COMPAT st_stm32_fmc
#elif DT_HAS_COMPAT_STATUS_OKAY(st_stm32h7_fmc)
#define DT_DRV_COMPAT st_stm32h7_fmc
#else
#error "No compatible FMC devicetree node found"
#endif
struct memc_stm32_config { struct memc_stm32_config {
uint32_t fmc; uint32_t fmc;
struct stm32_pclken pclken; struct stm32_pclken pclken;
@ -43,6 +50,16 @@ static int memc_stm32_init(const struct device *dev)
return r; return r;
} }
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32h7_fmc)
#if (DT_ENUM_IDX(DT_DRV_INST(0), st_mem_swap) == 1)
/* sdram-sram */
MODIFY_REG(FMC_Bank1_R->BTCR[0], FMC_BCR1_BMAP, FMC_BCR1_BMAP_0);
#elif (DT_ENUM_IDX(DT_DRV_INST(0), st_mem_swap) == 2)
/* sdramb2 */
MODIFY_REG(FMC_Bank1_R->BTCR[0], FMC_BCR1_BMAP, FMC_BCR1_BMAP_1);
#endif
#endif
return 0; return 0;
} }