--- /dev/null
+/*
+ * 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);
+ 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);
+}
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