stm32: Add SDRAM support for stm32f746 discovery board
This patch adds SDRAM support for stm32f746 discovery board.
This patch depends on previous patch.
This patch is based on STM32F4 and emcraft's[1].
[1]: https://github.com/EmcraftSystems/u-boot
Signed-off-by: Toshifumi NISHINAGA <tnishinaga.dev@gmail.com>
diff --git a/board/st/stm32f746-disco/stm32f746-disco.c b/board/st/stm32f746-disco/stm32f746-disco.c
index 0e04d14..404fdfa 100644
--- a/board/st/stm32f746-disco/stm32f746-disco.c
+++ b/board/st/stm32f746-disco/stm32f746-disco.c
@@ -10,6 +10,8 @@
#include <asm/armv7m.h>
#include <asm/arch/stm32.h>
#include <asm/arch/gpio.h>
+#include <asm/arch/rcc.h>
+#include <asm/arch/fmc.h>
#include <dm/platdata.h>
#include <dm/platform_data/serial_stm32x7.h>
#include <asm/arch/stm32_periph.h>
@@ -33,6 +35,221 @@
.af = STM32_GPIO_AF7
};
+const struct stm32_gpio_ctl gpio_ctl_fmc = {
+ .mode = STM32_GPIO_MODE_AF,
+ .otype = STM32_GPIO_OTYPE_PP,
+ .speed = STM32_GPIO_SPEED_100M,
+ .pupd = STM32_GPIO_PUPD_NO,
+ .af = STM32_GPIO_AF12
+};
+
+static const struct stm32_gpio_dsc ext_ram_fmc_gpio[] = {
+ /* Chip is LQFP144, see DM00077036.pdf for details */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_10}, /* 79, FMC_D15 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_9}, /* 78, FMC_D14 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_8}, /* 77, FMC_D13 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_15}, /* 68, FMC_D12 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_14}, /* 67, FMC_D11 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_13}, /* 66, FMC_D10 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_12}, /* 65, FMC_D9 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_11}, /* 64, FMC_D8 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_10}, /* 63, FMC_D7 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_9}, /* 60, FMC_D6 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_8}, /* 59, FMC_D5 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_7}, /* 58, FMC_D4 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_1}, /* 115, FMC_D3 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_0}, /* 114, FMC_D2 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_15}, /* 86, FMC_D1 */
+ {STM32_GPIO_PORT_D, STM32_GPIO_PIN_14}, /* 85, FMC_D0 */
+
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_1}, /* 142, FMC_NBL1 */
+ {STM32_GPIO_PORT_E, STM32_GPIO_PIN_0}, /* 141, FMC_NBL0 */
+
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_5}, /* 90, FMC_A15, BA1 */
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_4}, /* 89, FMC_A14, BA0 */
+
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_1}, /* 57, FMC_A11 */
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_0}, /* 56, FMC_A10 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_15}, /* 55, FMC_A9 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_14}, /* 54, FMC_A8 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_13}, /* 53, FMC_A7 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_12}, /* 50, FMC_A6 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_5}, /* 15, FMC_A5 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_4}, /* 14, FMC_A4 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_3}, /* 13, FMC_A3 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_2}, /* 12, FMC_A2 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_1}, /* 11, FMC_A1 */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_0}, /* 10, FMC_A0 */
+
+ {STM32_GPIO_PORT_H, STM32_GPIO_PIN_3}, /* 136, SDRAM_NE */
+ {STM32_GPIO_PORT_F, STM32_GPIO_PIN_11}, /* 49, SDRAM_NRAS */
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_15}, /* 132, SDRAM_NCAS */
+ {STM32_GPIO_PORT_H, STM32_GPIO_PIN_5}, /* 26, SDRAM_NWE */
+ {STM32_GPIO_PORT_C, STM32_GPIO_PIN_3}, /* 135, SDRAM_CKE */
+
+ {STM32_GPIO_PORT_G, STM32_GPIO_PIN_8}, /* 93, SDRAM_CLK */
+};
+
+static int fmc_setup_gpio(void)
+{
+ int rv = 0;
+ int i;
+
+ clock_setup(GPIO_B_CLOCK_CFG);
+ clock_setup(GPIO_C_CLOCK_CFG);
+ clock_setup(GPIO_D_CLOCK_CFG);
+ clock_setup(GPIO_E_CLOCK_CFG);
+ clock_setup(GPIO_F_CLOCK_CFG);
+ clock_setup(GPIO_G_CLOCK_CFG);
+ clock_setup(GPIO_H_CLOCK_CFG);
+
+ for (i = 0; i < ARRAY_SIZE(ext_ram_fmc_gpio); i++) {
+ rv = stm32_gpio_config(&ext_ram_fmc_gpio[i],
+ &gpio_ctl_fmc);
+ if (rv)
+ goto out;
+ }
+
+out:
+ return rv;
+}
+
+/*
+ * STM32 RCC FMC specific definitions
+ */
+#define RCC_ENR_FMC (1 << 0) /* FMC module clock */
+
+static inline u32 _ns2clk(u32 ns, u32 freq)
+{
+ u32 tmp = freq/1000000;
+ return (tmp * ns) / 1000;
+}
+
+#define NS2CLK(ns) (_ns2clk(ns, freq))
+
+/*
+ * Following are timings for IS42S16400J, from corresponding datasheet
+ */
+#define SDRAM_CAS 3 /* 3 cycles */
+#define SDRAM_NB 1 /* Number of banks */
+#define SDRAM_MWID 1 /* 16 bit memory */
+
+#define SDRAM_NR 0x1 /* 12-bit row */
+#define SDRAM_NC 0x0 /* 8-bit col */
+#define SDRAM_RBURST 0x1 /* Single read requests always as bursts */
+#define SDRAM_RPIPE 0x0 /* No HCLK clock cycle delay */
+
+#define SDRAM_TRRD NS2CLK(12)
+#define SDRAM_TRCD NS2CLK(18)
+#define SDRAM_TRP NS2CLK(18)
+#define SDRAM_TRAS NS2CLK(42)
+#define SDRAM_TRC NS2CLK(60)
+#define SDRAM_TRFC NS2CLK(60)
+#define SDRAM_TCDL (1 - 1)
+#define SDRAM_TRDL NS2CLK(12)
+#define SDRAM_TBDL (1 - 1)
+#define SDRAM_TREF (NS2CLK(64000000 / 8192) - 20)
+#define SDRAM_TCCD (1 - 1)
+
+#define SDRAM_TXSR SDRAM_TRFC /* Row cycle time after precharge */
+#define SDRAM_TMRD 1 /* Page 10, Mode Register Set */
+
+
+/* Last data in to row precharge, need also comply ineq on page 1648 */
+#define SDRAM_TWR max(\
+ (int)max((int)SDRAM_TRDL, (int)(SDRAM_TRAS - SDRAM_TRCD)), \
+ (int)(SDRAM_TRC - SDRAM_TRCD - SDRAM_TRP)\
+)
+
+
+#define SDRAM_MODE_BL_SHIFT 0
+#define SDRAM_MODE_CAS_SHIFT 4
+#define SDRAM_MODE_BL 0
+#define SDRAM_MODE_CAS SDRAM_CAS
+
+int dram_init(void)
+{
+ u32 freq;
+ int rv;
+
+ rv = fmc_setup_gpio();
+ if (rv)
+ return rv;
+
+ setbits_le32(RCC_BASE + RCC_AHB3ENR, RCC_ENR_FMC);
+
+ /*
+ * Get frequency for NS2CLK calculation.
+ */
+ freq = clock_get(CLOCK_AHB) / CONFIG_SYS_RAM_FREQ_DIV;
+
+ writel(
+ CONFIG_SYS_RAM_FREQ_DIV << FMC_SDCR_SDCLK_SHIFT
+ | SDRAM_CAS << FMC_SDCR_CAS_SHIFT
+ | SDRAM_NB << FMC_SDCR_NB_SHIFT
+ | SDRAM_MWID << FMC_SDCR_MWID_SHIFT
+ | SDRAM_NR << FMC_SDCR_NR_SHIFT
+ | SDRAM_NC << FMC_SDCR_NC_SHIFT
+ | SDRAM_RPIPE << FMC_SDCR_RPIPE_SHIFT
+ | SDRAM_RBURST << FMC_SDCR_RBURST_SHIFT,
+ &STM32_SDRAM_FMC->sdcr1);
+
+ writel(
+ SDRAM_TRCD << FMC_SDTR_TRCD_SHIFT
+ | SDRAM_TRP << FMC_SDTR_TRP_SHIFT
+ | SDRAM_TWR << FMC_SDTR_TWR_SHIFT
+ | SDRAM_TRC << FMC_SDTR_TRC_SHIFT
+ | SDRAM_TRAS << FMC_SDTR_TRAS_SHIFT
+ | SDRAM_TXSR << FMC_SDTR_TXSR_SHIFT
+ | SDRAM_TMRD << FMC_SDTR_TMRD_SHIFT,
+ &STM32_SDRAM_FMC->sdtr1);
+
+ writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_START_CLOCK,
+ &STM32_SDRAM_FMC->sdcmr);
+
+ udelay(200); /* 200 us delay, page 10, "Power-Up" */
+ FMC_BUSY_WAIT();
+
+ writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_PRECHARGE,
+ &STM32_SDRAM_FMC->sdcmr);
+
+ udelay(100);
+ FMC_BUSY_WAIT();
+
+ writel((FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_AUTOREFRESH
+ | 7 << FMC_SDCMR_NRFS_SHIFT), &STM32_SDRAM_FMC->sdcmr);
+
+ udelay(100);
+ FMC_BUSY_WAIT();
+
+ writel(FMC_SDCMR_BANK_1 | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
+ | SDRAM_MODE_CAS << SDRAM_MODE_CAS_SHIFT)
+ << FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
+ &STM32_SDRAM_FMC->sdcmr);
+
+ udelay(100);
+
+ FMC_BUSY_WAIT();
+
+ writel(FMC_SDCMR_BANK_1 | FMC_SDCMR_MODE_NORMAL,
+ &STM32_SDRAM_FMC->sdcmr);
+
+ FMC_BUSY_WAIT();
+
+ /* Refresh timer */
+ writel(SDRAM_TREF, &STM32_SDRAM_FMC->sdrtr);
+
+ /*
+ * Fill in global info with description of SRAM configuration
+ */
+ gd->bd->bi_dram[0].start = CONFIG_SYS_RAM_BASE;
+ gd->bd->bi_dram[0].size = CONFIG_SYS_RAM_SIZE;
+
+ gd->ram_size = CONFIG_SYS_RAM_SIZE;
+
+ return rv;
+}
+
static const struct stm32_gpio_dsc usart_gpio[] = {
{STM32_GPIO_PORT_A, STM32_GPIO_PIN_9}, /* TX */
{STM32_GPIO_PORT_B, STM32_GPIO_PIN_7}, /* RX */
@@ -88,12 +305,3 @@
return 0;
}
-
-int dram_init(void)
-{
- gd->bd->bi_dram[0].start = CONFIG_SYS_RAM_BASE;
- gd->bd->bi_dram[0].size = CONFIG_SYS_RAM_SIZE;
-
- gd->ram_size = CONFIG_SYS_RAM_SIZE;
- return 0;
-}