From: Patrice Chotard patrice.chotard@st.com
This allows to controls the memory internal mapping at address 0x0000 0000. We can either map at 0x0000 0000 : _ main flash memory _ system flash memory _ FMC bank1 (NOR/PSRAM 1 and 2) _ embedded SRAM _ FMC/SDRAM bank1
This is needed for future STM32F469-disco board
Signed-off-by: Patrice Chotard patrice.chotard@st.com --- drivers/ram/stm32_sdram.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/ram/stm32_sdram.c b/drivers/ram/stm32_sdram.c index 6e92b22..ec2edd6 100644 --- a/drivers/ram/stm32_sdram.c +++ b/drivers/ram/stm32_sdram.c @@ -11,6 +11,9 @@ #include <ram.h> #include <asm/io.h>
+#define MEM_MODE_MASK GENMASK(2, 0) +#define NOT_FOUND 0xff + DECLARE_GLOBAL_DATA_PTR;
struct stm32_fmc_regs { @@ -253,9 +256,31 @@ static int stm32_fmc_ofdata_to_platdata(struct udevice *dev) { struct stm32_sdram_params *params = dev_get_platdata(dev); struct bank_params *bank_params; + struct ofnode_phandle_args args; + u32 *syscfg_base; + u32 mem_remap; ofnode bank_node; char *bank_name; u8 bank = 0; + int ret; + + mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND); + if (mem_remap != NOT_FOUND) { + ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0, + &args); + if (ret) { + debug("%s: can't find syscon device (%d)\n", __func__, + ret); + return ret; + } + + syscfg_base = (u32 *)ofnode_get_addr(args.node); + + /* set memory mapping selection */ + clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap); + } else { + debug("%s: cannot find st,mem_remap property\n", __func__); + }
dev_for_each_subnode(bank_node, dev) { /* extract the bank index from DT */