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mb/siemens/mc_ehl5: Provide static function for disabling SDR modes

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As the functionality is required for other devices, it makes sense to
provide a function for this.

Change-Id: If1f070eebd365de93d4bce13d5201045d3306b17
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
This commit is contained in:
Mario Scheithauer 2024-11-26 12:30:00 +01:00 • committed by Werner Zeh
commit 7749088de7
1 changed files with 13 additions and 9 deletions
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22
src/mainboard/siemens/mc_ehl/variants/mc_ehl5/mainboard.c
View file

@ -17,6 +17,17 @@
#define MMC_CAP_BYP_SDR104 (1 << 14)
#define MMC_CAP_BYP_DDR50 (1 << 15)
/* Disable SDR104 and SDR50 mode while keeping DDR50 mode enabled. */
static void disable_sdr_modes(struct resource *res)
{
uint32_t reg;
write32(res2mmio(res, MMC_CAP_BYP, 0), MMC_CAP_BYP_EN);
reg = read32(res2mmio(res, MMC_CAP_BYP_REG1, 0));
reg &= ~(MMC_CAP_BYP_SDR104 | MMC_CAP_BYP_SDR50);
reg |= MMC_CAP_BYP_DDR50;
write32(res2mmio(res, MMC_CAP_BYP_REG1, 0), reg);
}
void variant_mainboard_final(void)
{
struct device *dev;
@ -30,21 +41,14 @@ void variant_mainboard_final(void)
if (dev)
pci_write_config8(dev, 0xd8, 0x3e);
/* Limit SD-Card speed to DDR50 mode to avoid SDR104/SDR50 modes due to
layout limitations. */
dev = pcidev_path_on_root(PCH_DEVFN_SDCARD);
if (dev) {
uint32_t reg;
uint16_t reg16;
struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0);
if (!res)
return;
write32(res2mmio(res, MMC_CAP_BYP, 0), MMC_CAP_BYP_EN);
reg = read32(res2mmio(res, MMC_CAP_BYP_REG1, 0));
/* Disable SDR104 and SDR50 mode while keeping DDR50 mode enabled. */
reg &= ~(MMC_CAP_BYP_SDR104 | MMC_CAP_BYP_SDR50);
reg |= MMC_CAP_BYP_DDR50;
write32(res2mmio(res, MMC_CAP_BYP_REG1, 0), reg);
disable_sdr_modes(res);
/* Use preset driver strength from preset value registers. */
reg16 = read16(res2mmio(res, HOSTCTRL2, 0));