ram: rockchip: add common code for sdram driver

There are some function like os_reg setting, capacity detect functions,
can be used as common code for different Rockchip SoCs, add a
sdram_common.c for all these functions.

Signed-off-by: YouMin Chen <cym@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

3 files changed, 292 insertions, 0 deletions

diff --git a/drivers/ram/rockchip/Kconfig b/drivers/ram/rockchip/Kconfig
index 4f274e01b3..dcc06b3fd3 100644
--- a/drivers/ram/rockchip/Kconfig
+++ b/drivers/ram/rockchip/Kconfig
@@ -5,6 +5,12 @@ config RAM_ROCKCHIP
 	help
 	  This enables support for ram drivers Rockchip SoCs.
 
+config ROCKCHIP_SDRAM_COMMON
+	bool "Enable rockchip sdram common driver"
+	depends on TPL_RAM || SPL_RAM
+	help
+	  This enable sdram common driver
+
 if RAM_ROCKCHIP
 
 config RAM_ROCKCHIP_DEBUG
diff --git a/drivers/ram/rockchip/Makefile b/drivers/ram/rockchip/Makefile
index feb1f82d00..2f90f4088e 100644
--- a/drivers/ram/rockchip/Makefile
+++ b/drivers/ram/rockchip/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_ROCKCHIP_RK322X) = sdram_rk322x.o
 obj-$(CONFIG_ROCKCHIP_RK3288) = sdram_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3328) = sdram_rk3328.o
 obj-$(CONFIG_RAM_RK3399) += sdram_rk3399.o
+obj-$(CONFIG_ROCKCHIP_SDRAM_COMMON) += sdram_common.o
diff --git a/drivers/ram/rockchip/sdram_common.c b/drivers/ram/rockchip/sdram_common.c
new file mode 100644
index 0000000000..3f0e1d9a42
--- /dev/null
+++ b/drivers/ram/rockchip/sdram_common.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2018 Rockchip Electronics Co., Ltd.
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/sdram.h>
+#include <asm/arch-rockchip/sdram_common.h>
+
+/* n: Unit bytes */
+void sdram_copy_to_reg(u32 *dest, const u32 *src, u32 n)
+{
+	int i;
+
+	for (i = 0; i < n / sizeof(u32); i++) {
+		writel(*src, dest);
+		src++;
+		dest++;
+	}
+}
+
+void sdram_org_config(struct sdram_cap_info *cap_info,
+		      struct sdram_base_params *base,
+		      u32 *p_os_reg2, u32 *p_os_reg3, u32 channel)
+{
+	*p_os_reg2 |= SYS_REG_ENC_DDRTYPE(base->dramtype);
+	*p_os_reg2 |= SYS_REG_ENC_NUM_CH(base->num_channels);
+
+	*p_os_reg2 |= SYS_REG_ENC_ROW_3_4(cap_info->row_3_4, channel);
+	*p_os_reg2 |= SYS_REG_ENC_CHINFO(channel);
+	*p_os_reg2 |= SYS_REG_ENC_RANK(cap_info->rank, channel);
+	*p_os_reg2 |= SYS_REG_ENC_COL(cap_info->col, channel);
+	*p_os_reg2 |= SYS_REG_ENC_BK(cap_info->bk, channel);
+	*p_os_reg2 |= SYS_REG_ENC_BW(cap_info->bw, channel);
+	*p_os_reg2 |= SYS_REG_ENC_DBW(cap_info->dbw, channel);
+
+	SYS_REG_ENC_CS0_ROW(cap_info->cs0_row, *p_os_reg2, *p_os_reg3, channel);
+	if (cap_info->cs1_row)
+		SYS_REG_ENC_CS1_ROW(cap_info->cs1_row, *p_os_reg2,
+				    *p_os_reg3, channel);
+	*p_os_reg3 |= SYS_REG_ENC_CS1_COL(cap_info->col, channel);
+	*p_os_reg3 |= SYS_REG_ENC_VERSION(DDR_SYS_REG_VERSION);
+}
+
+int sdram_detect_bw(struct sdram_cap_info *cap_info)
+{
+	return 0;
+}
+
+int sdram_detect_cs(struct sdram_cap_info *cap_info)
+{
+	return 0;
+}
+
+int sdram_detect_col(struct sdram_cap_info *cap_info,
+		     u32 coltmp)
+{
+	void __iomem *test_addr;
+	u32 col;
+	u32 bw = cap_info->bw;
+
+	for (col = coltmp; col >= 9; col -= 1) {
+		writel(0, CONFIG_SYS_SDRAM_BASE);
+		test_addr = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+				(1ul << (col + bw - 1ul)));
+		writel(PATTERN, test_addr);
+		if ((readl(test_addr) == PATTERN) &&
+		    (readl(CONFIG_SYS_SDRAM_BASE) == 0))
+			break;
+	}
+	if (col == 8) {
+		printascii("col error\n");
+		return -1;
+	}
+
+	cap_info->col = col;
+
+	return 0;
+}
+
+int sdram_detect_bank(struct sdram_cap_info *cap_info,
+		      u32 coltmp, u32 bktmp)
+{
+	void __iomem *test_addr;
+	u32 bk;
+	u32 bw = cap_info->bw;
+
+	test_addr = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+			(1ul << (coltmp + bktmp + bw - 1ul)));
+	writel(0, CONFIG_SYS_SDRAM_BASE);
+	writel(PATTERN, test_addr);
+	if ((readl(test_addr) == PATTERN) &&
+	    (readl(CONFIG_SYS_SDRAM_BASE) == 0))
+		bk = 3;
+	else
+		bk = 2;
+
+	cap_info->bk = bk;
+
+	return 0;
+}
+
+/* detect bg for ddr4 */
+int sdram_detect_bg(struct sdram_cap_info *cap_info,
+		    u32 coltmp)
+{
+	void __iomem *test_addr;
+	u32 dbw;
+	u32 bw = cap_info->bw;
+
+	test_addr = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+			(1ul << (coltmp + bw + 1ul)));
+	writel(0, CONFIG_SYS_SDRAM_BASE);
+	writel(PATTERN, test_addr);
+	if ((readl(test_addr) == PATTERN) &&
+	    (readl(CONFIG_SYS_SDRAM_BASE) == 0))
+		dbw = 0;
+	else
+		dbw = 1;
+
+	cap_info->dbw = dbw;
+
+	return 0;
+}
+
+/* detect dbw for ddr3,lpddr2,lpddr3,lpddr4 */
+int sdram_detect_dbw(struct sdram_cap_info *cap_info, u32 dram_type)
+{
+	u32 row, col, bk, bw, cs_cap, cs;
+	u32 die_bw_0 = 0, die_bw_1 = 0;
+
+	if (dram_type == DDR3 || dram_type == LPDDR4) {
+		cap_info->dbw = 1;
+	} else if (dram_type == LPDDR3 || dram_type == LPDDR2) {
+		row = cap_info->cs0_row;
+		col = cap_info->col;
+		bk = cap_info->bk;
+		cs = cap_info->rank;
+		bw = cap_info->bw;
+		cs_cap = (1 << (row + col + bk + bw - 20));
+		if (bw == 2) {
+			if (cs_cap <= 0x2000000) /* 256Mb */
+				die_bw_0 = (col < 9) ? 2 : 1;
+			else if (cs_cap <= 0x10000000) /* 2Gb */
+				die_bw_0 = (col < 10) ? 2 : 1;
+			else if (cs_cap <= 0x40000000) /* 8Gb */
+				die_bw_0 = (col < 11) ? 2 : 1;
+			else
+				die_bw_0 = (col < 12) ? 2 : 1;
+			if (cs > 1) {
+				row = cap_info->cs1_row;
+				cs_cap = (1 << (row + col + bk + bw - 20));
+				if (cs_cap <= 0x2000000) /* 256Mb */
+					die_bw_0 = (col < 9) ? 2 : 1;
+				else if (cs_cap <= 0x10000000) /* 2Gb */
+					die_bw_0 = (col < 10) ? 2 : 1;
+				else if (cs_cap <= 0x40000000) /* 8Gb */
+					die_bw_0 = (col < 11) ? 2 : 1;
+				else
+					die_bw_0 = (col < 12) ? 2 : 1;
+			}
+		} else {
+			die_bw_1 = 1;
+			die_bw_0 = 1;
+		}
+		cap_info->dbw = (die_bw_0 > die_bw_1) ? die_bw_0 : die_bw_1;
+	}
+
+	return 0;
+}
+
+int sdram_detect_row(struct sdram_cap_info *cap_info,
+		     u32 coltmp, u32 bktmp, u32 rowtmp)
+{
+	u32 row;
+	u32 bw = cap_info->bw;
+	void __iomem *test_addr;
+
+	for (row = rowtmp; row > 12; row--) {
+		writel(0, CONFIG_SYS_SDRAM_BASE);
+		test_addr = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+				(1ul << (row + bktmp + coltmp + bw - 1ul)));
+		writel(PATTERN, test_addr);
+		if ((readl(test_addr) == PATTERN) &&
+		    (readl(CONFIG_SYS_SDRAM_BASE) == 0))
+			break;
+	}
+	if (row == 12) {
+		printascii("row error");
+		return -1;
+	}
+
+	cap_info->cs0_row = row;
+
+	return 0;
+}
+
+int sdram_detect_row_3_4(struct sdram_cap_info *cap_info,
+			 u32 coltmp, u32 bktmp)
+{
+	u32 row_3_4;
+	u32 bw = cap_info->bw;
+	u32 row = cap_info->cs0_row;
+	void __iomem *test_addr, *test_addr1;
+
+	test_addr = CONFIG_SYS_SDRAM_BASE;
+	test_addr1 = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+			(0x3ul << (row + bktmp + coltmp + bw - 1ul - 1ul)));
+
+	writel(0, test_addr);
+	writel(PATTERN, test_addr1);
+	if ((readl(test_addr) == 0) && (readl(test_addr1) == PATTERN))
+		row_3_4 = 0;
+	else
+		row_3_4 = 1;
+
+	cap_info->row_3_4 = row_3_4;
+
+	return 0;
+}
+
+int sdram_detect_high_row(struct sdram_cap_info *cap_info)
+{
+	cap_info->cs0_high16bit_row = cap_info->cs0_row;
+	cap_info->cs1_high16bit_row = cap_info->cs1_row;
+
+	return 0;
+}
+
+int sdram_detect_cs1_row(struct sdram_cap_info *cap_info, u32 dram_type)
+{
+	void __iomem *test_addr;
+	u32 row = 0, bktmp, coltmp, bw;
+	ulong cs0_cap;
+	u32 byte_mask;
+
+	if (cap_info->rank == 2) {
+		cs0_cap = sdram_get_cs_cap(cap_info, 0, dram_type);
+
+		if (dram_type == DDR4) {
+			if (cap_info->dbw == 0)
+				bktmp = cap_info->bk + 2;
+			else
+				bktmp = cap_info->bk + 1;
+		} else {
+			bktmp = cap_info->bk;
+		}
+		bw = cap_info->bw;
+		coltmp = cap_info->col;
+
+		/*
+		 * because px30 support axi split,min bandwidth
+		 * is 8bit. if cs0 is 32bit, cs1 may 32bit or 16bit
+		 * so we check low 16bit data when detect cs1 row.
+		 * if cs0 is 16bit/8bit, we check low 8bit data.
+		 */
+		if (bw == 2)
+			byte_mask = 0xFFFF;
+		else
+			byte_mask = 0xFF;
+
+		/* detect cs1 row */
+		for (row = cap_info->cs0_row; row > 12; row--) {
+			test_addr = (void __iomem *)(CONFIG_SYS_SDRAM_BASE +
+				    cs0_cap +
+				    (1ul << (row + bktmp + coltmp + bw - 1ul)));
+			writel(0, CONFIG_SYS_SDRAM_BASE + cs0_cap);
+			writel(PATTERN, test_addr);
+
+			if (((readl(test_addr) & byte_mask) ==
+			     (PATTERN & byte_mask)) &&
+			    ((readl(CONFIG_SYS_SDRAM_BASE + cs0_cap) &
+			      byte_mask) == 0)) {
+				break;
+			}
+		}
+	}
+
+	cap_info->cs1_row = row;
+
+	return 0;
+}