[PATCH u-boot v2019.04-aspeed-openbmc 1/5] ARM: Aspeed: AST2600: Support booting from eMMC

[Eddie James]

Fix a number of things in the platform code for the AST2600 to
support booting the SPL from eMMC and then loading U-Boot from
eMMC.

Signed-off-by: Eddie James <eajames at linux.ibm.com>
---
 arch/arm/include/asm/arch-aspeed/boot0.h    |  2 +-
 arch/arm/mach-aspeed/ast2600/board_common.c | 72 +++++++++++++++++++++
 arch/arm/mach-aspeed/ast2600/spl.c          |  9 +--
 include/configs/aspeed-common.h             |  3 +
 4 files changed, 78 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/arch-aspeed/boot0.h b/arch/arm/include/asm/arch-aspeed/boot0.h
index ecd1e927c7..7fd5208773 100644
--- a/arch/arm/include/asm/arch-aspeed/boot0.h
+++ b/arch/arm/include/asm/arch-aspeed/boot0.h
@@ -13,7 +13,7 @@ _start:
 #ifdef CONFIG_SPL_BUILD
 	.word	0x0	/* Key location */
 	.word	0x0	/* start address of image */
-	.word	0X0	/* image size */
+	.word	0Xfc00	/* image size 63KB */
 	.word	0x0	/* signature address */
 	.word	0x0	/* header revision ID low */
 	.word	0x0	/* header revision ID high */
diff --git a/arch/arm/mach-aspeed/ast2600/board_common.c b/arch/arm/mach-aspeed/ast2600/board_common.c
index 449c7d0a23..a6ca8d33f8 100644
--- a/arch/arm/mach-aspeed/ast2600/board_common.c
+++ b/arch/arm/mach-aspeed/ast2600/board_common.c
@@ -8,6 +8,7 @@
 #include <timer.h>
 #include <asm/io.h>
 #include <asm/arch/timer.h>
+#include <linux/bitops.h>
 #include <linux/err.h>
 #include <dm/uclass.h>
 
@@ -110,3 +111,74 @@ int arch_early_init_r(void)
 	return 0;
 }
 
+union ast2600_pll_reg {
+	unsigned int w;
+	struct {
+		unsigned int m : 13;		/* bit[12:0]	*/
+		unsigned int n : 6;		/* bit[18:13]	*/
+		unsigned int p : 4;		/* bit[22:19]	*/
+		unsigned int off : 1;		/* bit[23]	*/
+		unsigned int bypass : 1;	/* bit[24]	*/
+		unsigned int reset : 1;		/* bit[25]	*/
+		unsigned int reserved : 6;	/* bit[31:26]	*/
+	} b;
+};
+
+void aspeed_mmc_init(void)
+{
+	u32 reset_bit;
+	u32 clkstop_bit;
+	u32 clkin = 25000000;
+	u32 pll_reg = 0;
+	u32 enableclk_bit;
+	u32 rate = 0;
+	u32 div = 0;
+	u32 i = 0;
+	u32 mult;
+	u32 clk_sel = readl(0x1e6e2300);
+
+	/* check whether boot from eMMC is enabled */
+	if ((readl(0x1e6e2500) & 0x4) == 0)
+		return;
+
+	/* disable eMMC boot controller engine */
+	*(volatile int *)0x1e6f500C &= ~0x90000000;
+	/* set pinctrl for eMMC */
+	*(volatile int *)0x1e6e2400 |= 0xff000000;
+
+	/* clock setting for eMMC */
+	enableclk_bit = BIT(15);
+
+	reset_bit = BIT(16);
+	clkstop_bit = BIT(27);
+	writel(reset_bit, 0x1e6e2040);
+	udelay(100);
+	writel(clkstop_bit, 0x1e6e2084);
+	mdelay(10);
+	writel(reset_bit, 0x1e6e2044);
+
+	pll_reg = readl(0x1e6e2220);
+	if (pll_reg & BIT(24)) {
+		/* Pass through mode */
+		mult = div = 1;
+	} else {
+		/* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1) */
+		union ast2600_pll_reg reg;
+		reg.w = pll_reg;
+		mult = (reg.b.m + 1) / (reg.b.n + 1);
+		div = (reg.b.p + 1);
+	}
+	rate = ((clkin * mult)/div);
+
+	for(i = 0; i < 8; i++) {
+		div = (i + 1) * 2;
+		if ((rate / div) <= 200000000)
+			break;
+	}
+
+	clk_sel &= ~(0x7 << 12);
+	clk_sel |= (i << 12) | BIT(11);
+	writel(clk_sel, 0x1e6e2300);
+
+	setbits_le32(0x1e6e2300, enableclk_bit);
+}
diff --git a/arch/arm/mach-aspeed/ast2600/spl.c b/arch/arm/mach-aspeed/ast2600/spl.c
index 27796b7385..1a248724ee 100644
--- a/arch/arm/mach-aspeed/ast2600/spl.c
+++ b/arch/arm/mach-aspeed/ast2600/spl.c
@@ -18,6 +18,7 @@ DECLARE_GLOBAL_DATA_PTR;
 #define AST_BOOTMODE_UART	2
 
 u32 aspeed_bootmode(void);
+void aspeed_mmc_init(void);
 
 void board_init_f(ulong dummy)
 {
@@ -26,6 +27,7 @@ void board_init_f(ulong dummy)
 	timer_init();
 	preloader_console_init();
 	dram_init();
+	aspeed_mmc_init();
 #endif
 }
 
@@ -68,13 +70,6 @@ void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
 }
 #endif
 
-#ifdef CONFIG_SPL_MMC_SUPPORT
-u32 spl_boot_mode(const u32 boot_device)
-{
-	return MMCSD_MODE_RAW;
-}
-#endif
-
 #ifdef CONFIG_SPL_OS_BOOT
 int spl_start_uboot(void)
 {
diff --git a/include/configs/aspeed-common.h b/include/configs/aspeed-common.h
index cdbffc97a2..7901bc2aff 100644
--- a/include/configs/aspeed-common.h
+++ b/include/configs/aspeed-common.h
@@ -11,6 +11,8 @@
 
 #include <asm/arch/platform.h>
 
+#define CONFIG_SUPPORT_EMMC_BOOT
+
 #define CONFIG_BOOTFILE		"all.bin"
 
 #define CONFIG_GATEWAYIP	192.168.0.1
@@ -40,6 +42,7 @@
 
 #define CONFIG_SYS_BOOTMAPSZ		(256 * 1024 * 1024)
 #define CONFIG_SYS_MALLOC_LEN		(32 << 20)
+#define CONFIG_SYS_MONITOR_LEN		0xD0000
 
 /*
  * BOOTP options
-- 
2.26.2