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u-boot-brain/arch/arm/cpu/armv7/sunxi/dram.c
Siarhei Siamashka 34759d74a3 sunxi: dram: Remove useless 'dramc_scan_dll_para()' function 
The attempt to do DRAM parameters calibration in 'dramc_scan_dll_para()'
function by trying different DLL adjustments and using the hardware
DQS gate training result as a feedback is a great source of inspiration,
but it just can't work properly the way it is implemented now. The fatal
problem of this implementation is that the DQS gating window can be
successfully found for almost every DLL delay adjustment setup that
gets tried. Thus making it unable to see any real difference between
'good' and 'bad' settings.

Also this code was supposed to be only activated by setting the highest
bit in the 'dram_tpr3' variable of the 'dram_para' struct (per-board
dram configuration). But none of the linux-sunxi devices has ever used
it for real. Basically, this code is just a dead weight.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2014-08-12 08:42:32 +02:00

567 lines
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/*
* sunxi DRAM controller initialization
* (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
* (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
*
* Based on sun4i Linux kernel sources mach-sunxi/pm/standby/dram*.c
* and earlier U-Boot Allwiner A10 SPL work
*
* (C) Copyright 2007-2012
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Berg Xing <bergxing@allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Unfortunately the only documentation we have on the sun7i DRAM
* controller is Allwinner boot0 + boot1 code, and that code uses
* magic numbers & shifts with no explanations. Hence this code is
* rather undocumented and full of magic.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/dram.h>
#include <asm/arch/timer.h>
#include <asm/arch/sys_proto.h>
#define CPU_CFG_CHIP_VER(n) ((n) << 6)
#define CPU_CFG_CHIP_VER_MASK CPU_CFG_CHIP_VER(0x3)
#define CPU_CFG_CHIP_REV_A 0x0
#define CPU_CFG_CHIP_REV_C1 0x1
#define CPU_CFG_CHIP_REV_C2 0x2
#define CPU_CFG_CHIP_REV_B 0x3
/*
* Wait up to 1s for mask to be clear in given reg.
*/
static void await_completion(u32 *reg, u32 mask)
{
unsigned long tmo = timer_get_us() + 1000000;
while (readl(reg) & mask) {
if (timer_get_us() > tmo)
panic("Timeout initialising DRAM\n");
}
}
static void mctl_ddr3_reset(void)
{
struct sunxi_dram_reg *dram =
(struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
#ifdef CONFIG_SUN4I
struct sunxi_timer_reg *timer =
(struct sunxi_timer_reg *)SUNXI_TIMER_BASE;
u32 reg_val;
writel(0, &timer->cpu_cfg);
reg_val = readl(&timer->cpu_cfg);
if ((reg_val & CPU_CFG_CHIP_VER_MASK) !=
CPU_CFG_CHIP_VER(CPU_CFG_CHIP_REV_A)) {
setbits_le32(&dram->mcr, DRAM_MCR_RESET);
udelay(2);
clrbits_le32(&dram->mcr, DRAM_MCR_RESET);
} else
#endif
{
clrbits_le32(&dram->mcr, DRAM_MCR_RESET);
udelay(2);
setbits_le32(&dram->mcr, DRAM_MCR_RESET);
}
}
static void mctl_set_drive(void)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
#ifdef CONFIG_SUN7I
clrsetbits_le32(&dram->mcr, DRAM_MCR_MODE_NORM(0x3) | (0x3 << 28),
#else
clrsetbits_le32(&dram->mcr, DRAM_MCR_MODE_NORM(0x3),
#endif
DRAM_MCR_MODE_EN(0x3) |
0xffc);
}
static void mctl_itm_disable(void)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
clrsetbits_le32(&dram->ccr, DRAM_CCR_INIT, DRAM_CCR_ITM_OFF);
}
static void mctl_itm_enable(void)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
clrbits_le32(&dram->ccr, DRAM_CCR_ITM_OFF);
}
static void mctl_enable_dll0(u32 phase)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
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)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
u32 i, n, bus_width;
bus_width = readl(&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], 0xf << 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] = {
#ifdef CONFIG_SUN5I
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0x1031, 0x1031, 0x0735, 0x1035,
0x1035, 0x0731, 0x1031, 0,
0x0301, 0x0301, 0x0301, 0x0301,
0x0301, 0x0301, 0x0301, 0
#endif
#ifdef CONFIG_SUN4I
0x0301, 0x0301, 0x0301, 0x0301,
0x0301, 0x0301, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0x1031, 0x1031, 0x0735, 0x5031,
0x1035, 0x0731, 0x1031, 0x0735,
0x1035, 0x1031, 0x0731, 0x1035,
0x1031, 0x0301, 0x0301, 0x0731
#endif
#ifdef CONFIG_SUN7I
0x0301, 0x0301, 0x0301, 0x0301,
0x0301, 0x0301, 0x0301, 0x0301,
0, 0, 0, 0,
0, 0, 0, 0,
0x1031, 0x1031, 0x0735, 0x1035,
0x1035, 0x0731, 0x1031, 0x0735,
0x1035, 0x1031, 0x0731, 0x1035,
0x0001, 0x1031, 0, 0x1031
/* last row differs from boot0 source table
* 0x1031, 0x0301, 0x0301, 0x0731
* but boot0 code skips #28 and #30, and sets #29 and #31 to the
* value from #28 entry (0x1031)
*/
#endif
};
static void mctl_configure_hostport(void)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
u32 i;
for (i = 0; i < 32; i++)
writel(hpcr_value[i], &dram->hpcr[i]);
}
static void mctl_setup_dram_clock(u32 clk)
{
u32 reg_val;
struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
/* setup DRAM PLL */
reg_val = readl(&ccm->pll5_cfg);
reg_val &= ~CCM_PLL5_CTRL_M_MASK; /* set M to 0 (x1) */
reg_val &= ~CCM_PLL5_CTRL_K_MASK; /* set K to 0 (x1) */
reg_val &= ~CCM_PLL5_CTRL_N_MASK; /* set N to 0 (x0) */
reg_val &= ~CCM_PLL5_CTRL_P_MASK; /* set P to 0 (x1) */
if (clk >= 540 && clk < 552) {
/* dram = 540MHz, pll5p = 540MHz */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(15));
reg_val |= CCM_PLL5_CTRL_P(1);
} else if (clk >= 512 && clk < 528) {
/* dram = 512MHz, pll5p = 384MHz */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(3));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(4));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(16));
reg_val |= CCM_PLL5_CTRL_P(2);
} else if (clk >= 496 && clk < 504) {
/* dram = 496MHz, pll5p = 372MHz */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(3));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(2));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(31));
reg_val |= CCM_PLL5_CTRL_P(2);
} else if (clk >= 468 && clk < 480) {
/* dram = 468MHz, pll5p = 468MHz */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(13));
reg_val |= CCM_PLL5_CTRL_P(1);
} else if (clk >= 396 && clk < 408) {
/* dram = 396MHz, pll5p = 396MHz */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(11));
reg_val |= CCM_PLL5_CTRL_P(1);
} else {
/* any other frequency that is a multiple of 24 */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(2));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(clk / 24));
reg_val |= CCM_PLL5_CTRL_P(CCM_PLL5_CTRL_P_X(2));
}
reg_val &= ~CCM_PLL5_CTRL_VCO_GAIN; /* PLL VCO Gain off */
reg_val |= CCM_PLL5_CTRL_EN; /* PLL On */
writel(reg_val, &ccm->pll5_cfg);
udelay(5500);
setbits_le32(&ccm->pll5_cfg, CCM_PLL5_CTRL_DDR_CLK);
#if defined(CONFIG_SUN4I) || defined(CONFIG_SUN7I)
/* reset GPS */
clrbits_le32(&ccm->gps_clk_cfg, CCM_GPS_CTRL_RESET | CCM_GPS_CTRL_GATE);
setbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_GPS);
udelay(1);
clrbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_GPS);
#endif
#if defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I)
/* setup MBUS clock */
reg_val = CCM_MBUS_CTRL_GATE |
#ifdef CONFIG_SUN7I
CCM_MBUS_CTRL_CLK_SRC(CCM_MBUS_CTRL_CLK_SRC_PLL6) |
CCM_MBUS_CTRL_N(CCM_MBUS_CTRL_N_X(2)) |
CCM_MBUS_CTRL_M(CCM_MBUS_CTRL_M_X(2));
#else /* defined(CONFIG_SUN5I) */
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));
#endif
writel(reg_val, &ccm->mbus_clk_cfg);
#endif
/*
* open DRAMC AHB & DLL register clock
* close it first
*/
#if defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I)
clrbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_SDRAM | CCM_AHB_GATE_DLL);
#else
clrbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_SDRAM);
#endif
udelay(22);
/* then open it */
#if defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I)
setbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_SDRAM | CCM_AHB_GATE_DLL);
#else
setbits_le32(&ccm->ahb_gate0, CCM_AHB_GATE_SDRAM);
#endif
udelay(22);
}
static int dramc_scan_readpipe(void)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
u32 reg_val;
/* data training trigger */
#ifdef CONFIG_SUN7I
clrbits_le32(&dram->csr, DRAM_CSR_FAILED);
#endif
setbits_le32(&dram->ccr, DRAM_CCR_DATA_TRAINING);
/* check whether data training process has completed */
await_completion(&dram->ccr, DRAM_CCR_DATA_TRAINING);
/* check data training result */
reg_val = readl(&dram->csr);
if (reg_val & DRAM_CSR_FAILED)
return -1;
return 0;
}
static void dramc_clock_output_en(u32 on)
{
#if defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I)
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
if (on)
setbits_le32(&dram->mcr, DRAM_MCR_DCLK_OUT);
else
clrbits_le32(&dram->mcr, DRAM_MCR_DCLK_OUT);
#endif
#ifdef CONFIG_SUN4I
struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
if (on)
setbits_le32(&ccm->dram_clk_cfg, CCM_DRAM_CTRL_DCLK_OUT);
else
clrbits_le32(&ccm->dram_clk_cfg, CCM_DRAM_CTRL_DCLK_OUT);
#endif
}
static const u16 tRFC_table[2][6] = {
/* 256Mb 512Mb 1Gb 2Gb 4Gb 8Gb */
/* DDR2 75ns 105ns 127.5ns 195ns 327.5ns invalid */
{ 77, 108, 131, 200, 336, 336 },
/* DDR3 invalid 90ns 110ns 160ns 300ns 350ns */
{ 93, 93, 113, 164, 308, 359 }
};
static void dramc_set_autorefresh_cycle(u32 clk, u32 type, u32 density)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
u32 tRFC, tREFI;
tRFC = (tRFC_table[type][density] * clk + 1023) >> 10;
tREFI = (7987 * clk) >> 10; /* <= 7.8us */
writel(DRAM_DRR_TREFI(tREFI) | DRAM_DRR_TRFC(tRFC), &dram->drr);
}
unsigned long dramc_init(struct dram_para *para)
{
struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
u32 reg_val;
u32 density;
int ret_val;
/* check input dram parameter structure */
if (!para)
return 0;
/* setup DRAM relative clock */
mctl_setup_dram_clock(para->clock);
#ifdef CONFIG_SUN5I
/* Disable any pad power save control */
writel(0, &dram->ppwrsctl);
#endif
/* reset external DRAM */
#ifndef CONFIG_SUN7I
mctl_ddr3_reset();
#endif
mctl_set_drive();
/* dram clock off */
dramc_clock_output_en(0);
#ifdef CONFIG_SUN4I
/* select dram controller 1 */
writel(DRAM_CSEL_MAGIC, &dram->csel);
#endif
mctl_itm_disable();
mctl_enable_dll0(para->tpr3);
/* configure external DRAM */
reg_val = 0x0;
if (para->type == DRAM_MEMORY_TYPE_DDR3)
reg_val |= DRAM_DCR_TYPE_DDR3;
reg_val |= DRAM_DCR_IO_WIDTH(para->io_width >> 3);
if (para->density == 256)
density = DRAM_DCR_CHIP_DENSITY_256M;
else if (para->density == 512)
density = DRAM_DCR_CHIP_DENSITY_512M;
else if (para->density == 1024)
density = DRAM_DCR_CHIP_DENSITY_1024M;
else if (para->density == 2048)
density = DRAM_DCR_CHIP_DENSITY_2048M;
else if (para->density == 4096)
density = DRAM_DCR_CHIP_DENSITY_4096M;
else if (para->density == 8192)
density = DRAM_DCR_CHIP_DENSITY_8192M;
else
density = DRAM_DCR_CHIP_DENSITY_256M;
reg_val |= DRAM_DCR_CHIP_DENSITY(density);
reg_val |= DRAM_DCR_BUS_WIDTH((para->bus_width >> 3) - 1);
reg_val |= DRAM_DCR_RANK_SEL(para->rank_num - 1);
reg_val |= DRAM_DCR_CMD_RANK_ALL;
reg_val |= DRAM_DCR_MODE(DRAM_DCR_MODE_INTERLEAVE);
writel(reg_val, &dram->dcr);
#ifdef CONFIG_SUN7I
setbits_le32(&dram->zqcr1, (0x1 << 24) | (0x1 << 1));
if (para->tpr4 & 0x2)
clrsetbits_le32(&dram->zqcr1, (0x1 << 24), (0x1 << 1));
dramc_clock_output_en(1);
#endif
#if (defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I))
/* set odt impendance divide ratio */
reg_val = ((para->zq) >> 8) & 0xfffff;
reg_val |= ((para->zq) & 0xff) << 20;
reg_val |= (para->zq) & 0xf0000000;
writel(reg_val, &dram->zqcr0);
#endif
#ifdef CONFIG_SUN7I
/* Set CKE Delay to about 1ms */
setbits_le32(&dram->idcr, 0x1ffff);
#endif
#ifdef CONFIG_SUN7I
if ((readl(&dram->ppwrsctl) & 0x1) != 0x1)
mctl_ddr3_reset();
else
setbits_le32(&dram->mcr, DRAM_MCR_RESET);
#else
/* dram clock on */
dramc_clock_output_en(1);
#endif
udelay(1);
await_completion(&dram->ccr, DRAM_CCR_INIT);
mctl_enable_dllx(para->tpr3);
#ifdef CONFIG_SUN4I
/* set odt impedance divide ratio */
reg_val = ((para->zq) >> 8) & 0xfffff;
reg_val |= ((para->zq) & 0xff) << 20;
reg_val |= (para->zq) & 0xf0000000;
writel(reg_val, &dram->zqcr0);
#endif
#ifdef CONFIG_SUN4I
/* set I/O configure register */
reg_val = 0x00cc0000;
reg_val |= (para->odt_en) & 0x3;
reg_val |= ((para->odt_en) & 0x3) << 30;
writel(reg_val, &dram->iocr);
#endif
/* set refresh period */
dramc_set_autorefresh_cycle(para->clock, para->type - 2, density);
/* set timing parameters */
writel(para->tpr0, &dram->tpr0);
writel(para->tpr1, &dram->tpr1);
writel(para->tpr2, &dram->tpr2);
if (para->type == DRAM_MEMORY_TYPE_DDR3) {
reg_val = DRAM_MR_BURST_LENGTH(0x0);
#if (defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I))
reg_val |= DRAM_MR_POWER_DOWN;
#endif
reg_val |= DRAM_MR_CAS_LAT(para->cas - 4);
reg_val |= DRAM_MR_WRITE_RECOVERY(0x5);
} else if (para->type == DRAM_MEMORY_TYPE_DDR2) {
reg_val = DRAM_MR_BURST_LENGTH(0x2);
reg_val |= DRAM_MR_CAS_LAT(para->cas);
reg_val |= DRAM_MR_WRITE_RECOVERY(0x5);
}
writel(reg_val, &dram->mr);
writel(para->emr1, &dram->emr);
writel(para->emr2, &dram->emr2);
writel(para->emr3, &dram->emr3);
/* set DQS window mode */
clrsetbits_le32(&dram->ccr, DRAM_CCR_DQS_DRIFT_COMP, DRAM_CCR_DQS_GATE);
#ifdef CONFIG_SUN7I
/* Command rate timing mode 2T & 1T */
if (para->tpr4 & 0x1)
setbits_le32(&dram->ccr, DRAM_CCR_COMMAND_RATE_1T);
#endif
/* reset external DRAM */
setbits_le32(&dram->ccr, DRAM_CCR_INIT);
await_completion(&dram->ccr, DRAM_CCR_INIT);
#ifdef CONFIG_SUN7I
/* setup zq calibration manual */
reg_val = readl(&dram->ppwrsctl);
if ((reg_val & 0x1) == 1) {
/* super_standby_flag = 1 */
reg_val = readl(0x01c20c00 + 0x120); /* rtc */
reg_val &= 0x000fffff;
reg_val |= 0x17b00000;
writel(reg_val, &dram->zqcr0);
/* exit self-refresh state */
clrsetbits_le32(&dram->dcr, 0x1f << 27, 0x12 << 27);
/* check whether command has been executed */
await_completion(&dram->dcr, 0x1 << 31);
udelay(2);
/* dram pad hold off */
setbits_le32(&dram->ppwrsctl, 0x16510000);
await_completion(&dram->ppwrsctl, 0x1);
/* exit self-refresh state */
clrsetbits_le32(&dram->dcr, 0x1f << 27, 0x12 << 27);
/* check whether command has been executed */
await_completion(&dram->dcr, 0x1 << 31);
udelay(2);
/* issue a refresh command */
clrsetbits_le32(&dram->dcr, 0x1f << 27, 0x13 << 27);
await_completion(&dram->dcr, 0x1 << 31);
udelay(2);
}
#endif
/* scan read pipe value */
mctl_itm_enable();
ret_val = dramc_scan_readpipe();
if (ret_val < 0)
return 0;
/* configure all host port */
mctl_configure_hostport();
return get_ram_size((long *)PHYS_SDRAM_0, PHYS_SDRAM_0_SIZE);
}
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