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ram: stm32: add stm32h7 support

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STM32F7 and H7 shared the same SDRAM control block.
On STM32H7 few control bits has been added.
The current driver need some minor adaptation as FMC block
enable/disable for H7.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrice Chotard 2017-07-18 17:37:29 +02:00 committed by Tom Rini
parent 4eefb0070d
commit 7016651eac
1 changed files with 24 additions and 1 deletions
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25
drivers/ram/stm32_sdram.c
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@ -54,6 +54,12 @@ struct stm32_fmc_regs {
u32 sdsr; /* SDRAM Status register */
};
/*
* NOR/PSRAM Control register BCR1
* FMC controller Enable, only availabe for H7
*/
#define FMC_BCR1_FMCEN BIT(31)
/* Control register SDCR */
#define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */
#define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */
@ -123,6 +129,11 @@ enum stm32_fmc_bank {
MAX_SDRAM_BANK,
};
enum stm32_fmc_family {
STM32F7_FMC,
STM32H7_FMC,
};
struct bank_params {
struct stm32_sdram_control *sdram_control;
struct stm32_sdram_timing *sdram_timing;
@ -134,6 +145,7 @@ struct stm32_sdram_params {
struct stm32_fmc_regs *base;
u8 no_sdram_banks;
struct bank_params bank_params[MAX_SDRAM_BANK];
enum stm32_fmc_family family;
};
#define SDRAM_MODE_BL_SHIFT 0
@ -151,6 +163,10 @@ int stm32_sdram_init(struct udevice *dev)
u32 ref_count;
u8 i;
/* disable the FMC controller */
if (params->family == STM32H7_FMC)
clrbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
for (i = 0; i < params->no_sdram_banks; i++) {
control = params->bank_params[i].sdram_control;
timing = params->bank_params[i].sdram_timing;
@ -193,6 +209,7 @@ int stm32_sdram_init(struct udevice *dev)
| timing->txsr << FMC_SDTR_TXSR_SHIFT
| timing->tmrd << FMC_SDTR_TMRD_SHIFT,
&regs->sdtr2);
if (target_bank == SDRAM_BANK1)
ctb = FMC_SDCMR_BANK_1;
else
@ -225,6 +242,10 @@ int stm32_sdram_init(struct udevice *dev)
writel(ref_count << 1, &regs->sdrtr);
}
/* enable the FMC controller */
if (params->family == STM32H7_FMC)
setbits_le32(&regs->bcr1, FMC_BCR1_FMCEN);
return 0;
}
@ -305,6 +326,7 @@ static int stm32_fmc_probe(struct udevice *dev)
return -EINVAL;
params->base = (struct stm32_fmc_regs *)addr;
params->family = dev_get_driver_data(dev);
#ifdef CONFIG_CLK
struct clk clk;
@ -337,7 +359,8 @@ static struct ram_ops stm32_fmc_ops = {
};
static const struct udevice_id stm32_fmc_ids[] = {
{ .compatible = "st,stm32-fmc" },
{ .compatible = "st,stm32-fmc", .data = STM32F7_FMC },
{ .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC },
{ }
};