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ram: stm32: add memory mapping selection support

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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>
This commit is contained in:
Patrice Chotard 2017-12-12 09:49:41 +01:00 committed by Tom Rini
parent c8f787760e
commit 0b3f789ad1
1 changed files with 25 additions and 0 deletions
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25
drivers/ram/stm32_sdram.c
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@ -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 */