sun8i: Add dram initialization support

Based on the register / dram_para headers from the Allwinner u-boot / linux
sources + the init sequences from boot0.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

3 files changed, 349 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile
index 3e8975a..1e89937 100644
--- a/arch/arm/cpu/armv7/sunxi/Makefile
+++ b/arch/arm/cpu/armv7/sunxi/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_MACH_SUN4I)	+= dram_sun4i.o
 obj-$(CONFIG_MACH_SUN5I)	+= dram_sun4i.o
 obj-$(CONFIG_MACH_SUN6I)	+= dram_sun6i.o
 obj-$(CONFIG_MACH_SUN7I)	+= dram_sun4i.o
+obj-$(CONFIG_MACH_SUN8I)	+= dram_sun8i.o
 ifdef CONFIG_SPL_FEL
 obj-y	+= start.o
 endif
diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c
index 9b3e80c..bc98c56 100644
--- a/arch/arm/cpu/armv7/sunxi/board.c
+++ b/arch/arm/cpu/armv7/sunxi/board.c
@@ -114,7 +114,8 @@ void reset_cpu(ulong addr)
 /* do some early init */
 void s_init(void)
 {
-#if defined CONFIG_SPL_BUILD && defined CONFIG_MACH_SUN6I
+#if defined CONFIG_SPL_BUILD && \
+		(defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I)
 	/* Magic (undocmented) value taken from boot0, without this DRAM
 	 * access gets messed up (seems cache related) */
 	setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800);
diff --git a/arch/arm/cpu/armv7/sunxi/dram_sun8i.c b/arch/arm/cpu/armv7/sunxi/dram_sun8i.c
new file mode 100644
index 0000000..aa6445e
--- /dev/null
+++ b/arch/arm/cpu/armv7/sunxi/dram_sun8i.c
@@ -0,0 +1,346 @@
+/*
+ * Sun8i platform dram controller init.
+ *
+ * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * Note this code uses a lot of magic hex values, that is because this code
+ * simply replays the init sequence as done by the Allwinner boot0 code, so
+ * we do not know what these values mean. There are no symbolic constants for
+ * these magic values, since we do not know how to name them and making up
+ * names for them is not useful.
+ *
+ * The register-layout of the sunxi_mctl_phy_reg-s looks a lot like the one
+ * found in the TI Keystone2 documentation:
+ * http://www.ti.com/lit/ug/spruhn7a/spruhn7a.pdf
+ * "Table4-2 DDR3 PHY Registers"
+ * This may be used as a (possible) reference for future work / cleanups.
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/dram.h>
+#include <asm/arch/prcm.h>
+
+static const struct dram_para dram_para = {
+	.clock = CONFIG_DRAM_CLK,
+	.type = 3,
+	.zq = CONFIG_DRAM_ZQ,
+	.odt_en = 1,
+	.para1 = 0, /* not used (only used when tpr13 bit 31 is set */
+	.para2 = 0, /* not used (only used when tpr13 bit 31 is set */
+	.mr0 = 6736,
+	.mr1 = 4,
+	.mr2 = 16,
+	.mr3 = 0,
+	/* tpr0 - 10 contain timing constants or-ed together in u32 vals */
+	.tpr0 = 0x2ab83def,
+	.tpr1 = 0x18082356,
+	.tpr2 = 0x00034156,
+	.tpr3 = 0x448c5533,
+	.tpr4 = 0x08010d00,
+	.tpr5 = 0x0340b20f,
+	.tpr6 = 0x20d118cc,
+	.tpr7 = 0x14062485,
+	.tpr8 = 0x220d1d52,
+	.tpr9 = 0x1e078c22,
+	.tpr10 = 0x3c,
+	.tpr11 = 0, /* not used */
+	.tpr12 = 0, /* not used */
+	.tpr13 = 0x30000,
+};
+
+static void mctl_sys_init(void)
+{
+	struct sunxi_ccm_reg * const ccm =
+		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+	/* enable pll5, note the divide by 2 is deliberate! */
+	clock_set_pll5(dram_para.clock * 1000000 / 2,
+		       dram_para.tpr13 & 0x40000);
+
+	/* deassert ahb mctl reset */
+	setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MCTL);
+
+	/* enable ahb mctl clock */
+	setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL);
+}
+
+static void mctl_apply_odt_correction(u32 *reg, int correction)
+{
+	int val;
+
+	val = (readl(reg) >> 8) & 0xff;
+	val += correction;
+
+	/* clamp */
+	if (val < 0)
+		val = 0;
+	else if (val > 255)
+		val = 255;
+
+	clrsetbits_le32(reg, 0xff00, val << 8);
+}
+
+static void mctl_init(u32 *bus_width)
+{
+	struct sunxi_ccm_reg * const ccm =
+		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+	struct sunxi_mctl_com_reg * const mctl_com =
+		(struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
+	struct sunxi_mctl_ctl_reg * const mctl_ctl =
+		(struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
+	struct sunxi_mctl_phy_reg * const mctl_phy =
+		(struct sunxi_mctl_phy_reg *)SUNXI_DRAM_PHY0_BASE;
+	int correction;
+
+	if (dram_para.tpr13 & 0x20)
+		writel(0x40b, &mctl_phy->dcr);
+	else
+		writel(0x1000040b, &mctl_phy->dcr);
+
+	if (dram_para.clock >= 480)
+		writel(0x5c000, &mctl_phy->dllgcr);
+	else
+		writel(0xdc000, &mctl_phy->dllgcr);
+
+	writel(0x0a003e3f, &mctl_phy->pgcr0);
+	writel(0x03008421, &mctl_phy->pgcr1);
+
+	writel(dram_para.mr0, &mctl_phy->mr0);
+	writel(dram_para.mr1, &mctl_phy->mr1);
+	writel(dram_para.mr2, &mctl_phy->mr2);
+	writel(dram_para.mr3, &mctl_phy->mr3);
+
+	if (!(dram_para.tpr13 & 0x10000)) {
+		clrsetbits_le32(&mctl_phy->dx0gcr, 0x3800, 0x2000);
+		clrsetbits_le32(&mctl_phy->dx1gcr, 0x3800, 0x2000);
+	}
+
+	/*
+	 * All the masking and shifting below converts what I assume are DDR
+	 * timing constants from Allwinner dram_para tpr format to the actual
+	 * timing registers format.
+	 */
+
+	writel((dram_para.tpr0 & 0x000fffff), &mctl_phy->ptr2);
+	writel((dram_para.tpr1 & 0x1fffffff), &mctl_phy->ptr3);
+	writel((dram_para.tpr0 & 0x3ff00000) >> 2 |
+	       (dram_para.tpr2 & 0x0003ffff), &mctl_phy->ptr4);
+
+	writel(dram_para.tpr3, &mctl_phy->dtpr0);
+	writel(dram_para.tpr4, &mctl_phy->dtpr2);
+
+	writel(0x01000081, &mctl_phy->dtcr);
+
+	if (dram_para.clock <= 240 || !(dram_para.odt_en & 0x01)) {
+		clrbits_le32(&mctl_phy->dx0gcr, 0x600);
+		clrbits_le32(&mctl_phy->dx1gcr, 0x600);
+	}
+	if (dram_para.clock <= 240) {
+		writel(0, &mctl_phy->odtcr);
+		writel(0, &mctl_ctl->odtmap);
+	}
+
+	writel(((dram_para.tpr5 & 0x0f00) << 12) |
+	       ((dram_para.tpr5 & 0x00f8) <<  9) |
+	       ((dram_para.tpr5 & 0x0007) <<  8),
+	       &mctl_ctl->rfshctl0);
+
+	writel(((dram_para.tpr5 & 0x0003f000) << 12) |
+	       ((dram_para.tpr5 & 0x00fc0000) >>  2) |
+	       ((dram_para.tpr5 & 0x3f000000) >> 16) |
+	       ((dram_para.tpr6 & 0x0000003f) >>  0),
+	       &mctl_ctl->dramtmg0);
+
+	writel(((dram_para.tpr6 & 0x000007c0) << 10) |
+	       ((dram_para.tpr6 & 0x0000f800) >> 3) |
+	       ((dram_para.tpr6 & 0x003f0000) >> 16),
+	       &mctl_ctl->dramtmg1);
+
+	writel(((dram_para.tpr6 & 0x0fc00000) << 2) |
+	       ((dram_para.tpr7 & 0x0000001f) << 16) |
+	       ((dram_para.tpr7 & 0x000003e0) << 3) |
+	       ((dram_para.tpr7 & 0x0000fc00) >> 10),
+	       &mctl_ctl->dramtmg2);
+
+	writel(((dram_para.tpr7 & 0x03ff0000) >> 16) |
+	       ((dram_para.tpr6 & 0xf0000000) >> 16),
+	       &mctl_ctl->dramtmg3);
+
+	writel(((dram_para.tpr7 & 0x3c000000) >> 2 ) |
+	       ((dram_para.tpr8 & 0x00000007) << 16) |
+	       ((dram_para.tpr8 & 0x00000038) << 5) |
+	       ((dram_para.tpr8 & 0x000003c0) >> 6),
+	       &mctl_ctl->dramtmg4);
+
+	writel(((dram_para.tpr8 & 0x00003c00) << 14) |
+	       ((dram_para.tpr8 & 0x0003c000) <<  2) |
+	       ((dram_para.tpr8 & 0x00fc0000) >> 10) |
+	       ((dram_para.tpr8 & 0x0f000000) >> 24),
+	       &mctl_ctl->dramtmg5);
+
+	writel(0x00000008, &mctl_ctl->dramtmg8);
+
+	writel(((dram_para.tpr8 & 0xf0000000) >> 4) |
+	       ((dram_para.tpr9 & 0x00007c00) << 6) |
+	       ((dram_para.tpr9 & 0x000003e0) << 3) |
+	       ((dram_para.tpr9 & 0x0000001f) >> 0),
+	       &mctl_ctl->pitmg0);
+
+	setbits_le32(&mctl_ctl->pitmg1, 0x80000);
+
+	writel(((dram_para.tpr9 & 0x003f8000) << 9) | 0x2001,
+	       &mctl_ctl->sched);
+
+	writel((dram_para.mr0 << 16) | dram_para.mr1, &mctl_ctl->init3);
+	writel((dram_para.mr2 << 16) | dram_para.mr3, &mctl_ctl->init4);
+
+	writel(0x00000000, &mctl_ctl->pimisc);
+	writel(0x80000000, &mctl_ctl->upd0);
+
+	writel(((dram_para.tpr9  & 0xffc00000) >> 22) |
+	       ((dram_para.tpr10 & 0x00000fff) << 16),
+	       &mctl_ctl->rfshtmg);
+
+	if (dram_para.tpr13 & 0x20)
+		writel(0x01040001, &mctl_ctl->mstr);
+	else
+		writel(0x01040401, &mctl_ctl->mstr);
+
+	if (!(dram_para.tpr13 & 0x20000)) {
+		writel(0x00000002, &mctl_ctl->pwrctl);
+		writel(0x00008001, &mctl_ctl->pwrtmg);
+	}
+
+	writel(0x00000001, &mctl_ctl->rfshctl3);
+	writel(0x00000001, &mctl_ctl->pimisc);
+
+	/* deassert dram_clk_cfg reset */
+	setbits_le32(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_RST);
+
+	setbits_le32(&mctl_com->ccr, 0x80000);
+
+	/* zq stuff */
+	writel((dram_para.zq >> 8) & 0xff, &mctl_phy->zqcr1);
+
+	writel(0x00000003, &mctl_phy->pir);
+	udelay(10);
+	mctl_await_completion(&mctl_phy->pgsr0, 0x09, 0x09);
+
+	writel(readl(&mctl_phy->zqsr0) | 0x10000000, &mctl_phy->zqcr2);
+	writel(dram_para.zq & 0xff, &mctl_phy->zqcr1);
+
+	/* A23-v1.0 SDK uses 0xfdf3, A23-v2.0 SDK uses 0x5f3 */
+	writel(0x000005f3, &mctl_phy->pir);
+	udelay(10);
+	mctl_await_completion(&mctl_phy->pgsr0, 0x03, 0x03);
+
+	if (readl(&mctl_phy->dx1gsr0) & 0x1000000) {
+		*bus_width = 8;
+		writel(0, &mctl_phy->dx1gcr);
+		writel(dram_para.zq & 0xff, &mctl_phy->zqcr1);
+		writel(0x5f3, &mctl_phy->pir);
+		udelay(10000);
+		setbits_le32(&mctl_ctl->mstr, 0x1000);
+	} else
+		*bus_width = 16;
+
+	correction = (dram_para.odt_en >> 8) & 0xff;
+	if (correction) {
+		if (dram_para.odt_en & 0x80000000)
+			correction = -correction;
+
+		mctl_apply_odt_correction(&mctl_phy->dx0lcdlr1, correction);
+		mctl_apply_odt_correction(&mctl_phy->dx1lcdlr1, correction);
+	}
+
+	mctl_await_completion(&mctl_ctl->statr, 0x01, 0x01);
+
+	writel(0x08003e3f, &mctl_phy->pgcr0);
+	writel(0x00000000, &mctl_ctl->rfshctl3);
+}
+
+unsigned long sunxi_dram_init(void)
+{
+	struct sunxi_mctl_com_reg * const mctl_com =
+		(struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
+	const u32 columns = 13;
+	u32 bus, bus_width, offset, page_size, rows;
+
+	mctl_sys_init();
+	mctl_init(&bus_width);
+
+	if (bus_width == 16) {
+		page_size = 8;
+		bus = 1;
+	} else {
+		page_size = 7;
+		bus = 0;
+	}
+
+	if (!(dram_para.tpr13 & 0x80000000)) {
+		/* Detect and set rows */
+		writel(0x000310f4 | MCTL_CR_PAGE_SIZE(page_size),
+		       &mctl_com->cr);
+		setbits_le32(&mctl_com->swonr, 0x0003ffff);
+		mctl_mem_fill();
+		for (rows = 11; rows < 16; rows++) {
+			offset = 1 << (rows + columns + bus);
+			if (mctl_mem_matches(offset))
+				break;
+		}
+		clrsetbits_le32(&mctl_com->cr, MCTL_CR_ROW_MASK,
+				MCTL_CR_ROW(rows));
+	} else {
+		rows = (dram_para.para1 >> 16) & 0xff;
+		writel(((dram_para.para2 & 0x000000f0) << 11) |
+		       ((rows - 1) << 4) |
+		       ((dram_para.para1 & 0x0f000000) >> 22) |
+		       0x31000 | MCTL_CR_PAGE_SIZE(page_size),
+		       &mctl_com->cr);
+		setbits_le32(&mctl_com->swonr, 0x0003ffff);
+	}
+
+	/* Setup DRAM master priority? If this is left out things still work */
+	writel(0x00000008, &mctl_com->mcr0_0);
+	writel(0x0001000d, &mctl_com->mcr1_0);
+	writel(0x00000004, &mctl_com->mcr0_1);
+	writel(0x00000080, &mctl_com->mcr1_1);
+	writel(0x00000004, &mctl_com->mcr0_2);
+	writel(0x00000019, &mctl_com->mcr1_2);
+	writel(0x00000004, &mctl_com->mcr0_3);
+	writel(0x00000080, &mctl_com->mcr1_3);
+	writel(0x00000004, &mctl_com->mcr0_4);
+	writel(0x01010040, &mctl_com->mcr1_4);
+	writel(0x00000004, &mctl_com->mcr0_5);
+	writel(0x0001002f, &mctl_com->mcr1_5);
+	writel(0x00000004, &mctl_com->mcr0_6);
+	writel(0x00010020, &mctl_com->mcr1_6);
+	writel(0x00000004, &mctl_com->mcr0_7);
+	writel(0x00010020, &mctl_com->mcr1_7);
+	writel(0x00000008, &mctl_com->mcr0_8);
+	writel(0x00000001, &mctl_com->mcr1_8);
+	writel(0x00000008, &mctl_com->mcr0_9);
+	writel(0x00000005, &mctl_com->mcr1_9);
+	writel(0x00000008, &mctl_com->mcr0_10);
+	writel(0x00000003, &mctl_com->mcr1_10);
+	writel(0x00000008, &mctl_com->mcr0_11);
+	writel(0x00000005, &mctl_com->mcr1_11);
+	writel(0x00000008, &mctl_com->mcr0_12);
+	writel(0x00000003, &mctl_com->mcr1_12);
+	writel(0x00000008, &mctl_com->mcr0_13);
+	writel(0x00000004, &mctl_com->mcr1_13);
+	writel(0x00000008, &mctl_com->mcr0_14);
+	writel(0x00000002, &mctl_com->mcr1_14);
+	writel(0x00000008, &mctl_com->mcr0_15);
+	writel(0x00000003, &mctl_com->mcr1_15);
+	writel(0x00010138, &mctl_com->bwcr);
+
+	return 1 << (rows + columns + bus);
+}