ram: ast2700: Add DRAM controller initialization

Add driver for AST2700 to initialize DRAM in SPL.

This patch also refactors the Kconfig dependency of
Aspeed DRAM drivers as some of them are shared among
the file structures of RV and ARM ISAs.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Acked-by: Leo Yu-Chi Liang <ycliang@andestech.com>

arch/riscv/include/asm/arch-ast2700/sdram.h

@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) Aspeed Technology Inc.
+ */
+#ifndef __ASM_AST2700_SDRAM_H__
+#define __ASM_AST2700_SDRAM_H__
+
+struct sdrammc_regs {
+	u32 prot_key;
+	u32 intr_status;
+	u32 intr_clear;
+	u32 intr_mask;
+	u32 mcfg;
+	u32 mctl;
+	u32 msts;
+	u32 error_status;
+	u32 actime1;
+	u32 actime2;
+	u32 actime3;
+	u32 actime4;
+	u32 actime5;
+	u32 actime6;
+	u32 actime7;
+	u32 dfi_timing;
+	u32 dcfg;
+	u32 dctl;
+	u32 mrctl;
+	u32 mrwr;
+	u32 mrrd;
+	u32 mr01;
+	u32 mr23;
+	u32 mr45;
+	u32 mr67;
+	u32 refctl;
+	u32 refmng_ctl;
+	u32 refsts;
+	u32 zqctl;
+	u32 ecc_addr_range;
+	u32 ecc_failure_status;
+	u32 ecc_failure_addr;
+	u32 ecc_test_control;
+	u32 ecc_test_status;
+	u32 arbctl;
+	u32 enccfg;
+	u32 protect_lock_set;
+	u32 protect_lock_status;
+	u32 protect_lock_reset;
+	u32 enc_min_addr;
+	u32 enc_max_addr;
+	u32 enc_key[4];
+	u32 enc_iv[3];
+	u32 bistcfg;
+	u32 bist_addr;
+	u32 bist_size;
+	u32 bist_patt;
+	u32 bist_res;
+	u32 bist_fail_addr;
+	u32 bist_fail_data[4];
+	u32 reserved2[2];
+	u32 debug_control;
+	u32 debug_status;
+	u32 phy_intf_status;
+	u32 testcfg;
+	u32 gfmcfg;
+	u32 gfm0ctl;
+	u32 gfm1ctl;
+	u32 reserved3[0xf8];
+};
+
+#define DRAMC_UNLK_KEY	0x1688a8a8
+
+/* offset 0x04 */
+#define DRAMC_IRQSTA_PWRCTL_ERR			BIT(16)
+#define DRAMC_IRQSTA_PHY_ERR			BIT(15)
+#define DRAMC_IRQSTA_LOWPOWER_DONE		BIT(12)
+#define DRAMC_IRQSTA_FREQ_CHG_DONE		BIT(11)
+#define DRAMC_IRQSTA_REF_DONE			BIT(10)
+#define DRAMC_IRQSTA_ZQ_DONE			BIT(9)
+#define DRAMC_IRQSTA_BIST_DONE			BIT(8)
+#define DRAMC_IRQSTA_ECC_RCVY_ERR		BIT(5)
+#define DRAMC_IRQSTA_ECC_ERR			BIT(4)
+#define DRAMC_IRQSTA_PROT_ERR			BIT(3)
+#define DRAMC_IRQSTA_OVERSZ_ERR			BIT(2)
+#define DRAMC_IRQSTA_MR_DONE			BIT(1)
+#define DRAMC_IRQSTA_PHY_INIT_DONE		BIT(0)
+
+/* offset 0x14 */
+#define DRAMC_MCTL_WB_SOFT_RESET		BIT(24)
+#define DRAMC_MCTL_PHY_CLK_DIS			BIT(18)
+#define DRAMC_MCTL_PHY_RESET			BIT(17)
+#define DRAMC_MCTL_PHY_POWER_ON			BIT(16)
+#define DRAMC_MCTL_FREQ_CHG_START		BIT(3)
+#define DRAMC_MCTL_PHY_LOWPOWER_START		BIT(2)
+#define DRAMC_MCTL_SELF_REF_START		BIT(1)
+#define DRAMC_MCTL_PHY_INIT_START		BIT(0)
+
+/* offset 0x40 */
+#define DRAMC_DFICFG_WD_POL			BIT(18)
+#define DRAMC_DFICFG_CKE_OUT			BIT(17)
+#define DRAMC_DFICFG_RESET			BIT(16)
+
+/* offset 0x48 */
+#define DRAMC_MRCTL_ERR_STATUS			BIT(31)
+#define DRAMC_MRCTL_READY_STATUS		BIT(30)
+#define DRAMC_MRCTL_MR_ADDR			BIT(8)
+#define DRAMC_MRCTL_CMD_DLL_RST			BIT(7)
+#define DRAMC_MRCTL_CMD_DQ_SEL			BIT(6)
+#define DRAMC_MRCTL_CMD_TYPE			BIT(2)
+#define DRAMC_MRCTL_CMD_WR_CTL			BIT(1)
+#define DRAMC_MRCTL_CMD_START			BIT(0)
+
+/* offset 0xC0 */
+#define DRAMC_BISTRES_RUNNING			BIT(10)
+#define DRAMC_BISTRES_FAIL			BIT(9)
+#define DRAMC_BISTRES_DONE			BIT(8)
+#define DRAMC_BISTCFG_INIT_MODE			BIT(7)
+#define DRAMC_BISTCFG_PMODE			GENMASK(6, 4)
+#define DRAMC_BISTCFG_BMODE			GENMASK(3, 2)
+#define DRAMC_BISTCFG_ENABLE			BIT(1)
+#define DRAMC_BISTCFG_START			BIT(0)
+#define BIST_PMODE_CRC				(3)
+#define BIST_BMODE_RW_SWITCH			(3)
+
+/* DRAMC048 MR Control Register */
+#define MR_TYPE_SHIFT				2
+#define MR_RW					(0 << MR_TYPE_SHIFT)
+#define MR_MPC					BIT(2)
+#define MR_VREFCS				(2 << MR_TYPE_SHIFT)
+#define MR_VREFCA				(3 << MR_TYPE_SHIFT)
+#define MR_ADDRESS_SHIFT			8
+#define MR_ADDR(n)				(((n) << MR_ADDRESS_SHIFT) | DRAMC_MRCTL_CMD_WR_CTL)
+#define MR_NUM_SHIFT				4
+#define MR_NUM(n)				((n) << MR_NUM_SHIFT)
+#define MR_DLL_RESET				BIT(7)
+#define MR_1T_MODE				BIT(16)
+
+#endif

drivers/ram/Makefile

@@ -14,7 +14,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
 
 obj-$(CONFIG_K3_AM654_DDRSS) += k3-am654-ddrss.o
 obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
-obj-$(CONFIG_ARCH_ASPEED) += aspeed/
+obj-$(CONFIG_ASPEED_RAM) += aspeed/
 obj-$(CONFIG_K3_DDRSS) += k3-ddrss/
 
 obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o

drivers/ram/aspeed/Kconfig

@@ -1,6 +1,7 @@
 menuconfig ASPEED_RAM
 	bool "ASPEED SDRAM configuration"
-	depends on RAM && ARCH_ASPEED
+	depends on RAM
+	depends on ARCH_ASPEED || TARGET_ASPEED_AST2700_IBEX
 	default ARCH_ASPEED
 	help
 	 Configuration options for DDR SDRAM on ASPEED systems.
@@ -8,8 +9,6 @@ menuconfig ASPEED_RAM
 	 RAM initialisation is always built in for the platform. This menu
 	 allows customisation of the configuration used.
 
-if ASPEED_RAM
-
 config ASPEED_DDR4_DUALX8
 	bool "Enable Dual X8 DDR4 die"
 	depends on ASPEED_RAM
@@ -74,4 +73,24 @@ config ASPEED_DDR4_1600
 	  select DDR4 target data rate at 1600M
 endchoice
 
-endif # End of ASPEED_RAM
+choice
+	prompt "AST2700 DDR target date rate"
+	default ASPEED_DDR_3200
+	depends on ASPEED_RAM
+	depends on TARGET_ASPEED_AST2700_IBEX
+
+config ASPEED_DDR_1600
+	bool "1600 Mbps"
+	help
+	  select DDR target data rate at 1600M
+
+config ASPEED_DDR_2400
+	bool "2400 Mbps"
+	help
+	  select DDR target data rate at 2400M
+
+config ASPEED_DDR_3200
+	bool "3200 Mbps"
+	help
+	  select DDR target data rate at 3200M
+endchoice

drivers/ram/aspeed/Makefile

@@ -2,3 +2,4 @@
 #
 obj-$(CONFIG_ASPEED_AST2500) += sdram_ast2500.o
 obj-$(CONFIG_ASPEED_AST2600) += sdram_ast2600.o
+obj-$(CONFIG_TARGET_ASPEED_AST2700_IBEX) += sdram_ast2700.o