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Diffstat (limited to 'src/cpu/allwinner/a10/raminit.c')
-rw-r--r--src/cpu/allwinner/a10/raminit.c468
1 files changed, 468 insertions, 0 deletions
diff --git a/src/cpu/allwinner/a10/raminit.c b/src/cpu/allwinner/a10/raminit.c
new file mode 100644
index 0000000000..84fe4e8d99
--- /dev/null
+++ b/src/cpu/allwinner/a10/raminit.c
@@ -0,0 +1,468 @@
+/*
+ * Allwinner A10 DRAM controller initialization
+ *
+ * Based on sun4i Linux kernel sources mach-sunxi/pm/standby/dram*.c
+ * and earlier U-Boot Allwiner A10 SPL work
+ *
+ * Copyright (C) 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
+ * Copyright (C) 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+ * Copyright (C) 2007-2012 Allwinner Technology Co., Ltd.
+ * Berg Xing <bergxing@allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+#include "clock.h"
+#include "dramc.h"
+#include "memmap.h"
+#include "timer.h"
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+
+static struct a1x_dramc *const dram = (void *)A1X_DRAMC_BASE;
+
+static void mctl_ddr3_reset(void)
+{
+ if (a1x_get_cpu_chip_revision() != A1X_CHIP_REV_A) {
+ setbits_le32(&dram->mcr, DRAM_MCR_RESET);
+ udelay(2);
+ clrbits_le32(&dram->mcr, DRAM_MCR_RESET);
+ } else {
+ clrbits_le32(&dram->mcr, DRAM_MCR_RESET);
+ udelay(2);
+ setbits_le32(&dram->mcr, DRAM_MCR_RESET);
+ }
+}
+
+static void mctl_set_drive(void)
+{
+ clrsetbits_le32(&dram->mcr, DRAM_MCR_MODE_NORM(0x3),
+ DRAM_MCR_MODE_EN(0x3) | 0xffc);
+}
+
+static void mctl_itm_disable(void)
+{
+ clrsetbits_le32(&dram->ccr, DRAM_CCR_INIT, DRAM_CCR_ITM_OFF);
+}
+
+static void mctl_itm_enable(void)
+{
+ clrbits_le32(&dram->ccr, DRAM_CCR_ITM_OFF);
+}
+
+static void mctl_enable_dll0(u32 phase)
+{
+ clrsetbits_le32(&dram->dllcr[0], 0x3f << 6,
+ ((phase >> 16) & 0x3f) << 6);
+ clrsetbits_le32(&dram->dllcr[0], DRAM_DLLCR_NRESET, DRAM_DLLCR_DISABLE);
+ udelay(2);
+
+ clrbits_le32(&dram->dllcr[0], DRAM_DLLCR_NRESET | DRAM_DLLCR_DISABLE);
+ udelay(22);
+
+ clrsetbits_le32(&dram->dllcr[0], DRAM_DLLCR_DISABLE, DRAM_DLLCR_NRESET);
+ udelay(22);
+}
+
+/*
+ * Note: This differs from pm/standby in that it checks the bus width
+ */
+static void mctl_enable_dllx(u32 phase)
+{
+ u32 i, n, bus_width;
+
+ bus_width = read32(&dram->dcr);
+
+ if ((bus_width & DRAM_DCR_BUS_WIDTH_MASK) ==
+ DRAM_DCR_BUS_WIDTH(DRAM_DCR_BUS_WIDTH_32BIT))
+ n = DRAM_DCR_NR_DLLCR_32BIT;
+ else
+ n = DRAM_DCR_NR_DLLCR_16BIT;
+
+ for (i = 1; i < n; i++) {
+ clrsetbits_le32(&dram->dllcr[i], 0x4 << 14,
+ (phase & 0xf) << 14);
+ clrsetbits_le32(&dram->dllcr[i], DRAM_DLLCR_NRESET,
+ DRAM_DLLCR_DISABLE);
+ phase >>= 4;
+ }
+ udelay(2);
+
+ for (i = 1; i < n; i++)
+ clrbits_le32(&dram->dllcr[i], DRAM_DLLCR_NRESET |
+ DRAM_DLLCR_DISABLE);
+ udelay(22);
+
+ for (i = 1; i < n; i++)
+ clrsetbits_le32(&dram->dllcr[i], DRAM_DLLCR_DISABLE,
+ DRAM_DLLCR_NRESET);
+ udelay(22);
+}
+
+static u32 hpcr_value[32] = {
+ 0x0301, 0x0301, 0x0301, 0x0301,
+ 0x0301, 0x0301, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0x1031, 0x1031, 0x0735, 0x1035,
+ 0x1035, 0x0731, 0x1031, 0x0735,
+ 0x1035, 0x1031, 0x0731, 0x1035,
+ 0x1031, 0x0301, 0x0301, 0x0731
+};
+
+static void mctl_configure_hostport(void)
+{
+ u32 i;
+
+ for (i = 0; i < 32; i++)
+ write32(hpcr_value[i], &dram->hpcr[i]);
+}
+
+static void mctl_setup_dram_clock(u32 clk)
+{
+ /* setup DRAM PLL */
+ a1x_pll5_configure(clk / 24, 2, 2, 1);
+
+ /* FIXME: This bit is not documented for A10, and altering it doesn't
+ * seem to change anything.
+ *
+ * #define CCM_PLL5_CTRL_VCO_GAIN (0x1 << 19)
+ * reg_val = read32(&ccm->pll5_cfg);
+ * reg_val &= ~CCM_PLL5_CTRL_VCO_GAIN; // PLL VCO Gain off
+ * write32(reg_val, &ccm->pll5_cfg);
+ */
+ udelay(5500);
+
+ a1x_pll5_enable_dram_clock_output();
+
+ /* reset GPS */
+ /* FIXME: These bits are also undocumented, and seem to have no effect
+ * on A10.
+ *
+ * #define CCM_GPS_CTRL_RESET (0x1 << 0)
+ * #define CCM_GPS_CTRL_GATE (0x1 << 1)
+ * clrbits_le32(&ccm->gps_clk_cfg, CCM_GPS_CTRL_RESET | CCM_GPS_CTRL_GATE);
+ */
+ a1x_periph_clock_enable(A1X_CLKEN_GPS);
+ udelay(1);
+ a1x_periph_clock_disable(A1X_CLKEN_GPS);
+
+ /* setup MBUS clock */
+ /* FIXME: The MBUS does not seem to be present or do anything on A10. It
+ * is documented in the A13 user manual, but changing settings on A10
+ * has no effect.
+ *
+ * #define CCM_MBUS_CTRL_M(n) (((n) & 0xf) << 0)
+ * #define CCM_MBUS_CTRL_M_MASK CCM_MBUS_CTRL_M(0xf)
+ * #define CCM_MBUS_CTRL_M_X(n) ((n) - 1)
+ * #define CCM_MBUS_CTRL_N(n) (((n) & 0xf) << 16)
+ * #define CCM_MBUS_CTRL_N_MASK CCM_MBUS_CTRL_N(0xf)
+ * #define CCM_MBUS_CTRL_N_X(n) (((n) >> 3) ? 3 : (((n) >> 2) ? 2 : (((n) >> 1) ? 1 : 0)))
+ * #define CCM_MBUS_CTRL_CLK_SRC(n) (((n) & 0x3) << 24)
+ * #define CCM_MBUS_CTRL_CLK_SRC_MASK CCM_MBUS_CTRL_CLK_SRC(0x3)
+ * #define CCM_MBUS_CTRL_CLK_SRC_HOSC 0x0
+ * #define CCM_MBUS_CTRL_CLK_SRC_PLL6 0x1
+ * #define CCM_MBUS_CTRL_CLK_SRC_PLL5 0x2
+ * #define CCM_MBUS_CTRL_GATE (0x1 << 31)
+ * reg_val = CCM_MBUS_CTRL_GATE |
+ * CCM_MBUS_CTRL_CLK_SRC(CCM_MBUS_CTRL_CLK_SRC_PLL5) |
+ * CCM_MBUS_CTRL_N(CCM_MBUS_CTRL_N_X(1)) |
+ * CCM_MBUS_CTRL_M(CCM_MBUS_CTRL_M_X(2));
+ * write32(reg_val, &ccm->mbus_clk_cfg);
+ */
+ /*
+ * open DRAMC AHB & DLL register clock
+ * close it first
+ */
+ a1x_periph_clock_disable(A1X_CLKEN_SDRAM);
+
+ udelay(22);
+
+ /* then open it */
+ a1x_periph_clock_enable(A1X_CLKEN_SDRAM);
+ udelay(22);
+}
+
+static int dramc_scan_readpipe(void)
+{
+ u32 reg32;
+
+ /* data training trigger */
+ setbits_le32(&dram->ccr, DRAM_CCR_DATA_TRAINING);
+
+ /* check whether data training process has completed */
+ while (read32(&dram->ccr) & DRAM_CCR_DATA_TRAINING) ;
+
+ /* check data training result */
+ reg32 = read32(&dram->csr);
+ if (reg32 & DRAM_CSR_FAILED)
+ return -1;
+
+ return 0;
+}
+
+static int dramc_scan_dll_para(void)
+{
+ const u32 dqs_dly[7] = { 0x3, 0x2, 0x1, 0x0, 0xe, 0xd, 0xc };
+ const u32 clk_dly[15] = { 0x07, 0x06, 0x05, 0x04, 0x03,
+ 0x02, 0x01, 0x00, 0x08, 0x10,
+ 0x18, 0x20, 0x28, 0x30, 0x38
+ };
+ u32 clk_dqs_count[15];
+ u32 dqs_i, clk_i, cr_i;
+ u32 max_val, min_val;
+ u32 dqs_index, clk_index;
+
+ /* Find DQS_DLY Pass Count for every CLK_DLY */
+ for (clk_i = 0; clk_i < 15; clk_i++) {
+ clk_dqs_count[clk_i] = 0;
+ clrsetbits_le32(&dram->dllcr[0], 0x3f << 6,
+ (clk_dly[clk_i] & 0x3f) << 6);
+ for (dqs_i = 0; dqs_i < 7; dqs_i++) {
+ for (cr_i = 1; cr_i < 5; cr_i++) {
+ clrsetbits_le32(&dram->dllcr[cr_i],
+ 0x4f << 14,
+ (dqs_dly[clk_i] & 0x4f) << 14);
+ }
+ udelay(2);
+ if (dramc_scan_readpipe() == 0)
+ clk_dqs_count[clk_i]++;
+ }
+ }
+ /* Test DQS_DLY Pass Count for every CLK_DLY from up to down */
+ for (dqs_i = 15; dqs_i > 0; dqs_i--) {
+ max_val = 15;
+ min_val = 15;
+ for (clk_i = 0; clk_i < 15; clk_i++) {
+ if (clk_dqs_count[clk_i] == dqs_i) {
+ max_val = clk_i;
+ if (min_val == 15)
+ min_val = clk_i;
+ }
+ }
+ if (max_val < 15)
+ break;
+ }
+
+ /* Check if Find a CLK_DLY failed */
+ if (!dqs_i)
+ goto fail;
+
+ /* Find the middle index of CLK_DLY */
+ clk_index = (max_val + min_val) >> 1;
+ if ((max_val == (15 - 1)) && (min_val > 0))
+ /* if CLK_DLY[MCTL_CLK_DLY_COUNT] is very good, then the middle
+ * value can be more close to the max_val
+ */
+ clk_index = (15 + clk_index) >> 1;
+ else if ((max_val < (15 - 1)) && (min_val == 0))
+ /* if CLK_DLY[0] is very good, then the middle value can be more
+ * close to the min_val
+ */
+ clk_index >>= 1;
+ if (clk_dqs_count[clk_index] < dqs_i)
+ clk_index = min_val;
+
+ /* Find the middle index of DQS_DLY for the CLK_DLY got above, and Scan
+ * read pipe again
+ */
+ clrsetbits_le32(&dram->dllcr[0], 0x3f << 6,
+ (clk_dly[clk_index] & 0x3f) << 6);
+ max_val = 7;
+ min_val = 7;
+ for (dqs_i = 0; dqs_i < 7; dqs_i++) {
+ clk_dqs_count[dqs_i] = 0;
+ for (cr_i = 1; cr_i < 5; cr_i++) {
+ clrsetbits_le32(&dram->dllcr[cr_i],
+ 0x4f << 14,
+ (dqs_dly[dqs_i] & 0x4f) << 14);
+ }
+ udelay(2);
+ if (dramc_scan_readpipe() == 0) {
+ clk_dqs_count[dqs_i] = 1;
+ max_val = dqs_i;
+ if (min_val == 7)
+ min_val = dqs_i;
+ }
+ }
+
+ if (max_val < 7) {
+ dqs_index = (max_val + min_val) >> 1;
+ if ((max_val == (7 - 1)) && (min_val > 0))
+ dqs_index = (7 + dqs_index) >> 1;
+ else if ((max_val < (7 - 1)) && (min_val == 0))
+ dqs_index >>= 1;
+ if (!clk_dqs_count[dqs_index])
+ dqs_index = min_val;
+ for (cr_i = 1; cr_i < 5; cr_i++) {
+ clrsetbits_le32(&dram->dllcr[cr_i],
+ 0x4f << 14,
+ (dqs_dly[dqs_index] & 0x4f) << 14);
+ }
+ udelay(2);
+ return dramc_scan_readpipe();
+ }
+
+ fail:
+ clrbits_le32(&dram->dllcr[0], 0x3f << 6);
+ for (cr_i = 1; cr_i < 5; cr_i++)
+ clrbits_le32(&dram->dllcr[cr_i], 0x4f << 14);
+ udelay(2);
+
+ return dramc_scan_readpipe();
+}
+
+static void dramc_set_autorefresh_cycle(u32 clk)
+{
+ u32 reg32;
+ u32 tmp_val;
+ u32 reg_dcr;
+
+ if (clk < 600) {
+ reg_dcr = read32(&dram->dcr);
+ if ((reg_dcr & DRAM_DCR_CHIP_DENSITY_MASK) <=
+ DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_1024M))
+ reg32 = (131 * clk) >> 10;
+ else
+ reg32 = (336 * clk) >> 10;
+
+ tmp_val = (7987 * clk) >> 10;
+ tmp_val = tmp_val * 9 - 200;
+ reg32 |= tmp_val << 8;
+ reg32 |= 0x8 << 24;
+ write32(reg32, &dram->drr);
+ } else {
+ write32(0x0, &dram->drr);
+ }
+}
+
+unsigned long dramc_init(struct dram_para *para)
+{
+ u32 reg32;
+ int ret_val;
+
+ /* check input dram parameter structure */
+ if (!para)
+ return 0;
+
+ /* setup DRAM relative clock */
+ mctl_setup_dram_clock(para->clock);
+
+ /* reset external DRAM */
+ mctl_ddr3_reset();
+
+ mctl_set_drive();
+
+ /* dram clock off */
+ a1x_gate_dram_clock_output();
+
+ /* select dram controller 1 */
+ write32(DRAM_CSEL_MAGIC, &dram->csel);
+
+ mctl_itm_disable();
+ mctl_enable_dll0(para->tpr3);
+
+ /* configure external DRAM */
+ reg32 = 0x0;
+ if (para->type == DRAM_MEMORY_TYPE_DDR3)
+ reg32 |= DRAM_DCR_TYPE_DDR3;
+ reg32 |= DRAM_DCR_IO_WIDTH(para->io_width >> 3);
+
+ if (para->density == 256)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_256M);
+ else if (para->density == 512)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_512M);
+ else if (para->density == 1024)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_1024M);
+ else if (para->density == 2048)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_2048M);
+ else if (para->density == 4096)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_4096M);
+ else if (para->density == 8192)
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_8192M);
+ else
+ reg32 |= DRAM_DCR_CHIP_DENSITY(DRAM_DCR_CHIP_DENSITY_256M);
+
+ reg32 |= DRAM_DCR_BUS_WIDTH((para->bus_width >> 3) - 1);
+ reg32 |= DRAM_DCR_RANK_SEL(para->rank_num - 1);
+ reg32 |= DRAM_DCR_CMD_RANK_ALL;
+ reg32 |= DRAM_DCR_MODE(DRAM_DCR_MODE_INTERLEAVE);
+ write32(reg32, &dram->dcr);
+
+ /* dram clock on */
+ a1x_ungate_dram_clock_output();
+
+ udelay(1);
+
+ while (read32(&dram->ccr) & DRAM_CCR_INIT) ;
+
+ mctl_enable_dllx(para->tpr3);
+
+ /* set odt impendance divide ratio */
+ reg32 = ((para->zq) >> 8) & 0xfffff;
+ reg32 |= ((para->zq) & 0xff) << 20;
+ reg32 |= (para->zq) & 0xf0000000;
+ write32(reg32, &dram->zqcr0);
+
+ /* set I/O configure register */
+ reg32 = 0x00cc0000;
+ reg32 |= (para->odt_en) & 0x3;
+ reg32 |= ((para->odt_en) & 0x3) << 30;
+ write32(reg32, &dram->iocr);
+
+ /* set refresh period */
+ dramc_set_autorefresh_cycle(para->clock);
+
+ /* set timing parameters */
+ write32(para->tpr0, &dram->tpr0);
+ write32(para->tpr1, &dram->tpr1);
+ write32(para->tpr2, &dram->tpr2);
+
+ if (para->type == DRAM_MEMORY_TYPE_DDR3) {
+ reg32 = DRAM_MR_BURST_LENGTH(0x0);
+ reg32 |= DRAM_MR_CAS_LAT(para->cas - 4);
+ reg32 |= DRAM_MR_WRITE_RECOVERY(0x5);
+ } else if (para->type == DRAM_MEMORY_TYPE_DDR2) {
+ reg32 = DRAM_MR_BURST_LENGTH(0x2);
+ reg32 |= DRAM_MR_CAS_LAT(para->cas);
+ reg32 |= DRAM_MR_WRITE_RECOVERY(0x5);
+ }
+ write32(reg32, &dram->mr);
+
+ write32(para->emr1, &dram->emr);
+ write32(para->emr2, &dram->emr2);
+ write32(para->emr3, &dram->emr3);
+
+ /* set DQS window mode */
+ clrsetbits_le32(&dram->ccr, DRAM_CCR_DQS_DRIFT_COMP, DRAM_CCR_DQS_GATE);
+
+ /* reset external DRAM */
+ setbits_le32(&dram->ccr, DRAM_CCR_INIT);
+ while (read32(&dram->ccr) & DRAM_CCR_INIT) ;
+
+ /* scan read pipe value */
+ mctl_itm_enable();
+ if (para->tpr3 & (0x1 << 31)) {
+ ret_val = dramc_scan_dll_para();
+ if (ret_val == 0)
+ para->tpr3 =
+ (((read32(&dram->dllcr[0]) >> 6) & 0x3f) << 16) |
+ (((read32(&dram->dllcr[1]) >> 14) & 0xf) << 0) |
+ (((read32(&dram->dllcr[2]) >> 14) & 0xf) << 4) |
+ (((read32(&dram->dllcr[3]) >> 14) & 0xf) << 8) |
+ (((read32(&dram->dllcr[4]) >> 14) & 0xf) << 12);
+ } else {
+ ret_val = dramc_scan_readpipe();
+ }
+
+ if (ret_val < 0)
+ return 0;
+
+ /* configure all host port */
+ mctl_configure_hostport();
+
+ return para->size;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-05 05:08:03 +0000