rk3288: detect sdram size at runtime

we use Kconfig define sdram size before, but there may use
different sdram size in the same overlay, so we must detect
sdram size at runtime now. If we use 4G byte sdram, we can
use[0x00000000:0xff000000], since the [0xff000000:0xffffffff]
is the register space.

BUG=chrome-os-partner:35521
TEST=Boot from mighty
BRANCH=None

Change-Id: I7a167c268483743c3eaed8b71c7ec545a688270c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ad4f27dd08c467888eee87e3d9c4ab3077751898
Original-Change-Id: Ib32aed50c9cae6db495ff3bab28266de91f3e73b
Original-Signed-off-by: huang lin <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/243139
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9734
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

5 files changed, 79 insertions, 27 deletions

diff --git a/src/soc/rockchip/rk3288/Makefile.inc b/src/soc/rockchip/rk3288/Makefile.inc
index c7e52a9f3e..c4a77e0fcd 100644
--- a/src/soc/rockchip/rk3288/Makefile.inc
+++ b/src/soc/rockchip/rk3288/Makefile.inc
@@ -57,6 +57,7 @@ ramstage-y += timer.c
 ramstage-y += i2c.c
 ramstage-y += clock.c
 ramstage-y += spi.c
+ramstage-y += sdram.c
 ramstage-y += gpio.c
 ramstage-y += rk808.c
 ramstage-y += pwm.c
diff --git a/src/soc/rockchip/rk3288/cbmem.c b/src/soc/rockchip/rk3288/cbmem.c
index 2eed97281a..38ea365469 100644
--- a/src/soc/rockchip/rk3288/cbmem.c
+++ b/src/soc/rockchip/rk3288/cbmem.c
@@ -20,9 +20,9 @@
 #include <cbmem.h>
 #include <stddef.h>
 #include <symbols.h>
+#include <soc/sdram.h>
 
 void *cbmem_top(void)
 {
-	return _dram + (size_t)CONFIG_DRAM_SIZE_MB*MiB;
+	return _dram + sdram_size_mb()*MiB;
 }
-
diff --git a/src/soc/rockchip/rk3288/include/soc/sdram.h b/src/soc/rockchip/rk3288/include/soc/sdram.h
index 16e4f81713..8f37cb7574 100644
--- a/src/soc/rockchip/rk3288/include/soc/sdram.h
+++ b/src/soc/rockchip/rk3288/include/soc/sdram.h
@@ -98,5 +98,6 @@ struct rk3288_sdram_params {
 
 void sdram_init(const struct rk3288_sdram_params *sdram_params);
 u32 sdram_get_ram_code(void);
+size_t sdram_size_mb(void);
 const struct rk3288_sdram_params *get_sdram_config(void);
 #endif
diff --git a/src/soc/rockchip/rk3288/sdram.c b/src/soc/rockchip/rk3288/sdram.c
index cda36be05d..2698024435 100644
--- a/src/soc/rockchip/rk3288/sdram.c
+++ b/src/soc/rockchip/rk3288/sdram.c
@@ -489,18 +489,27 @@ static struct rk3288_msch_regs * const rk3288_msch[2] = {
  * [3:2] bw_ch0
  * [1:0] dbw_ch0
 */
-#define SYS_REG_DDRTYPE(n)		((n) << 13)
-#define SYS_REG_NUM_CH(n)		(((n) - 1) << 12)
-#define SYS_REG_ROW_3_4(n, ch)		((n) << (30 + (ch)))
-#define SYS_REG_CHINFO(ch)		(1 << (28 + (ch)))
-#define SYS_REG_RANK(n, ch)		(((n) - 1) << (11 + ((ch) * 16)))
-#define SYS_REG_COL(n, ch)		(((n) - 9) << (9 + ((ch) * 16)))
-#define SYS_REG_BK(n, ch)		(((n) == 3 ? 0 : 1) \
+#define SYS_REG_ENC_ROW_3_4(n, ch)	((n) << (30 + (ch)))
+#define SYS_REG_DEC_ROW_3_4(n, ch)	((n >> (30 + ch)) & 0x1)
+#define SYS_REG_ENC_CHINFO(ch)		(1 << (28 + (ch)))
+#define SYS_REG_ENC_DDRTYPE(n)		((n) << 13)
+#define SYS_REG_ENC_NUM_CH(n)		(((n) - 1) << 12)
+#define SYS_REG_DEC_NUM_CH(n)		(1 + ((n >> 12) & 0x1))
+#define SYS_REG_ENC_RANK(n, ch)		(((n) - 1) << (11 + ((ch) * 16)))
+#define SYS_REG_DEC_RANK(n, ch)		(1 + ((n >> (11 + 16 * ch)) & 0x1))
+#define SYS_REG_ENC_COL(n, ch)		(((n) - 9) << (9 + ((ch) * 16)))
+#define SYS_REG_DEC_COL(n, ch)		(9 + ((n >> (9 + 16 * ch)) & 0x3))
+#define SYS_REG_ENC_BK(n, ch)		(((n) == 3 ? 0 : 1) \
 					<< (8 + ((ch) * 16)))
-#define SYS_REG_CS0_ROW(n, ch)		(((n) - 13) << (6 + ((ch) * 16)))
-#define SYS_REG_CS1_ROW(n, ch)		(((n) - 13) << (4 + ((ch) * 16)))
-#define SYS_REG_BW(n, ch)		((2 >> (n)) << (2 + ((ch) * 16)))
-#define SYS_REG_DBW(n, ch)		((2 >> (n)) << (0 + ((ch) * 16)))
+#define SYS_REG_DEC_BK(n, ch)		(3 - ((n >> (8 + 16 * ch)) & 0x1))
+#define SYS_REG_ENC_CS0_ROW(n, ch)	(((n) - 13) << (6 + ((ch) * 16)))
+#define SYS_REG_DEC_CS0_ROW(n, ch)	(13 + ((n >> (6 + 16 * ch)) & 0x3))
+#define SYS_REG_ENC_CS1_ROW(n, ch)	(((n) - 13) << (4 + ((ch) * 16)))
+#define SYS_REG_DEC_CS1_ROW(n, ch)	(13 + ((n >> (4 + 16 * ch)) & 0x3))
+#define SYS_REG_ENC_BW(n, ch)		((2 >> (n)) << (2 + ((ch) * 16)))
+#define SYS_REG_DEC_BW(n, ch)		(2 >> ((n >> (2 + 16 * ch)) & 0x3))
+#define SYS_REG_ENC_DBW(n, ch)		((2 >> (n)) << (0 + ((ch) * 16)))
+#define SYS_REG_DEC_DBW(n, ch)		(2 >> ((n >> (0 + 16 * ch)) & 0x3))
 
 static void copy_to_reg(u32 *dest, const u32 *src, u32 n)
 {
@@ -942,20 +951,20 @@ static void dram_all_config(const struct rk3288_sdram_params *sdram_params)
 	u32 sys_reg = 0;
 	unsigned int channel;
 
-	sys_reg |= SYS_REG_DDRTYPE(sdram_params->dramtype);
-	sys_reg |= SYS_REG_NUM_CH(sdram_params->num_channels);
+	sys_reg |= SYS_REG_ENC_DDRTYPE(sdram_params->dramtype);
+	sys_reg |= SYS_REG_ENC_NUM_CH(sdram_params->num_channels);
 	for (channel = 0; channel < sdram_params->num_channels; channel++) {
 		const struct rk3288_sdram_channel *info =
 			&(sdram_params->ch[channel]);
-		sys_reg |= SYS_REG_ROW_3_4(info->row_3_4, channel);
-		sys_reg |= SYS_REG_CHINFO(channel);
-		sys_reg |= SYS_REG_RANK(info->rank, channel);
-		sys_reg |= SYS_REG_COL(info->col, channel);
-		sys_reg |= SYS_REG_BK(info->bk, channel);
-		sys_reg |= SYS_REG_CS0_ROW(info->cs0_row, channel);
-		sys_reg |= SYS_REG_CS1_ROW(info->cs1_row, channel);
-		sys_reg |= SYS_REG_BW(info->bw, channel);
-		sys_reg |= SYS_REG_DBW(info->dbw, channel);
+		sys_reg |= SYS_REG_ENC_ROW_3_4(info->row_3_4, channel);
+		sys_reg |= SYS_REG_ENC_CHINFO(channel);
+		sys_reg |= SYS_REG_ENC_RANK(info->rank, channel);
+		sys_reg |= SYS_REG_ENC_COL(info->col, channel);
+		sys_reg |= SYS_REG_ENC_BK(info->bk, channel);
+		sys_reg |= SYS_REG_ENC_CS0_ROW(info->cs0_row, channel);
+		sys_reg |= SYS_REG_ENC_CS1_ROW(info->cs1_row, channel);
+		sys_reg |= SYS_REG_ENC_BW(info->bw, channel);
+		sys_reg |= SYS_REG_ENC_DBW(info->dbw, channel);
 
 		dram_cfg_rbc(channel, sdram_params);
 	}
@@ -1076,3 +1085,45 @@ void sdram_init(const struct rk3288_sdram_params *sdram_params)
 	dram_all_config(sdram_params);
 	printk(BIOS_INFO, "Finish SDRAM initialization...\n");
 }
+
+size_t sdram_size_mb(void)
+{
+	u32 rank, col, bk, cs0_row, cs1_row, bw, row_3_4;
+	size_t chipsize_mb = 0;
+	static size_t size_mb = 0;
+	u32 ch;
+
+	if (!size_mb) {
+
+		u32 sys_reg = readl(&rk3288_pmu->sys_reg[2]);
+		u32 ch_num = SYS_REG_DEC_NUM_CH(sys_reg);
+
+		for (ch = 0; ch < ch_num; ch++) {
+			rank = SYS_REG_DEC_RANK(sys_reg, ch);
+			col = SYS_REG_DEC_COL(sys_reg, ch);
+			bk = SYS_REG_DEC_BK(sys_reg, ch);
+			cs0_row = SYS_REG_DEC_CS0_ROW(sys_reg, ch);
+			cs1_row = SYS_REG_DEC_CS1_ROW(sys_reg, ch);
+			bw = SYS_REG_DEC_BW(sys_reg, ch);
+			row_3_4 = SYS_REG_DEC_ROW_3_4(sys_reg, ch);
+
+			chipsize_mb = (1 << (cs0_row + col + bk + bw - 20));
+
+			if (rank > 1)
+				chipsize_mb += chipsize_mb >>
+					(cs0_row - cs1_row);
+			if (row_3_4)
+				chipsize_mb = chipsize_mb * 3 / 4;
+			size_mb += chipsize_mb;
+		}
+
+		/*
+		 * we use the 0x00000000~0xfeffffff space
+		 * since 0xff000000~0xffffffff is soc register space
+		 * so we reserve it
+		 */
+		size_mb = MIN(size_mb, 0xff000000/MiB);
+	}
+
+	return size_mb;
+}
diff --git a/src/soc/rockchip/rk3288/soc.c b/src/soc/rockchip/rk3288/soc.c
index fa26c6db36..ec04f9ccd7 100644
--- a/src/soc/rockchip/rk3288/soc.c
+++ b/src/soc/rockchip/rk3288/soc.c
@@ -25,6 +25,7 @@
 #include <gpio.h>
 #include <soc/display.h>
 #include <soc/soc.h>
+#include <soc/sdram.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
@@ -35,9 +36,7 @@
 
 static void soc_init(device_t dev)
 {
-	ram_resource(dev, 0, (uintptr_t)_dram/KiB,
-		     CONFIG_DRAM_SIZE_MB*(MiB/KiB));
-
+	ram_resource(dev, 0, (uintptr_t)_dram/KiB, sdram_size_mb()*(MiB/KiB));
 	if (vboot_skip_display_init())
 		printk(BIOS_INFO, "Skipping display init.\n");
 #if !IS_ENABLED(CONFIG_SKIP_DISPLAY_INIT_HACK)