[v6 09/18] mmc: dwmmc: socfpga: Add ATF support for MMC driver

[Siew Chin Lim]

From: Chee Hong Ang <chee.hong.ang at intel.com>

In non-secure mode (EL2), MMC driver calls the SMC/PSCI services
provided by ATF to set SDMMC's DRVSEL and SMPLSEL.

Signed-off-by: Chee Hong Ang <chee.hong.ang at intel.com>
Signed-off-by: Siew Chin Lim <elly.siew.chin.lim at intel.com>

---
v5
---
Call secure register access helper function to write the secure register.
Return error if fail to write the secure register.
---
 drivers/mmc/socfpga_dw_mmc.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
index 0a2845bcc2..7a485b492d 100644
--- a/drivers/mmc/socfpga_dw_mmc.c
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <log.h>
 #include <asm/arch/clock_manager.h>
+#include <asm/arch/secure_reg_helper.h>
 #include <asm/arch/system_manager.h>
 #include <clk.h>
 #include <dm.h>
@@ -13,6 +14,7 @@
 #include <errno.h>
 #include <fdtdec.h>
 #include <dm/device_compat.h>
+#include <linux/intel-smc.h>
 #include <linux/libfdt.h>
 #include <linux/err.h>
 #include <malloc.h>
@@ -58,10 +60,22 @@ static int socfpga_dwmci_clksel(struct dwmci_host *host)
 
 	debug("%s: drvsel %d smplsel %d\n", __func__,
 	      priv->drvsel, priv->smplsel);
+
+#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)
+	int ret;
+
+	ret = socfpga_secure_reg_write32(SOCFPGA_SECURE_REG_SYSMGR_SOC64_SDMMC,
+					 sdmmc_mask);
+	if (ret) {
+		printf("DWMMC: Failed to set clksel via SMC call");
+		return ret;
+	}
+#else
 	writel(sdmmc_mask, socfpga_get_sysmgr_addr() + SYSMGR_SDMMC);
 
 	debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
 		readl(socfpga_get_sysmgr_addr() + SYSMGR_SDMMC));
+#endif
 
 	/* Enable SDMMC clock */
 	setbits_le32(socfpga_get_clkmgr_addr() + CLKMGR_PERPLL_EN,
-- 
2.13.0