u-boot/arch/mips/mach-ath79/ar934x/ddr.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

162 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* Based on RAM init sequence by Piotr Dymacz <pepe2k@gmail.com>
*/
#include <common.h>
#include <asm/io.h>
#include <asm/addrspace.h>
#include <asm/types.h>
#include <mach/ar71xx_regs.h>
#include <mach/ath79.h>
DECLARE_GLOBAL_DATA_PTR;
enum {
AR934X_SDRAM = 0,
AR934X_DDR1,
AR934X_DDR2,
};
struct ar934x_mem_config {
u32 config1;
u32 config2;
u32 mode;
u32 extmode;
u32 tap;
};
static const struct ar934x_mem_config ar934x_mem_config[] = {
[AR934X_SDRAM] = { 0x7fbe8cd0, 0x959f66a8, 0x33, 0, 0x1f1f },
[AR934X_DDR1] = { 0x7fd48cd0, 0x99d0e6a8, 0x33, 0, 0x14 },
[AR934X_DDR2] = { 0xc7d48cd0, 0x9dd0e6a8, 0x33, 0, 0x10012 },
};
void ar934x_ddr_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz)
{
void __iomem *ddr_regs;
const struct ar934x_mem_config *memcfg;
int memtype;
u32 reg, cycle, ctl;
ddr_regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
MAP_NOCACHE);
reg = ath79_get_bootstrap();
if (reg & AR934X_BOOTSTRAP_SDRAM_DISABLED) { /* DDR */
if (reg & AR934X_BOOTSTRAP_DDR1) { /* DDR 1 */
memtype = AR934X_DDR1;
cycle = 0xffff;
} else { /* DDR 2 */
memtype = AR934X_DDR2;
if (gd->arch.rev) {
ctl = BIT(6); /* Undocumented bit :-( */
if (reg & BIT(3))
cycle = 0xff;
else
cycle = 0xffff;
} else {
/* Force DDR2/x16 configuratio on old chips. */
ctl = 0;
cycle = 0xffff; /* DDR2 16bit */
}
writel(0xe59, ddr_regs + AR934X_DDR_REG_DDR2_CONFIG);
udelay(100);
writel(0x10, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(0x20, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(ctl, ddr_regs + AR934X_DDR_REG_CTL_CONF);
udelay(10);
}
} else { /* SDRAM */
memtype = AR934X_SDRAM;
cycle = 0xffffffff;
writel(0x13b, ddr_regs + AR934X_DDR_REG_CTL_CONF);
udelay(100);
/* Undocumented register */
writel(0x13b, ddr_regs + 0x118);
udelay(100);
}
memcfg = &ar934x_mem_config[memtype];
writel(memcfg->config1, ddr_regs + AR71XX_DDR_REG_CONFIG);
udelay(100);
writel(memcfg->config2, ddr_regs + AR71XX_DDR_REG_CONFIG2);
udelay(100);
writel(0x8, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(memcfg->mode | 0x100, ddr_regs + AR71XX_DDR_REG_MODE);
mdelay(1);
writel(0x1, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
if (memtype == AR934X_DDR2) {
writel(memcfg->mode | 0x100, ddr_regs + AR71XX_DDR_REG_EMR);
udelay(100);
writel(0x2, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
}
if (memtype != AR934X_SDRAM)
writel(0x402, ddr_regs + AR71XX_DDR_REG_EMR);
udelay(100);
writel(0x2, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(0x8, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(memcfg->mode, ddr_regs + AR71XX_DDR_REG_MODE);
udelay(100);
writel(0x1, ddr_regs + AR71XX_DDR_REG_CONTROL);
udelay(10);
writel(0x412c /* FIXME */, ddr_regs + AR71XX_DDR_REG_REFRESH);
udelay(100);
writel(memcfg->tap, ddr_regs + AR71XX_DDR_REG_TAP_CTRL0);
writel(memcfg->tap, ddr_regs + AR71XX_DDR_REG_TAP_CTRL1);
if (memtype != AR934X_SDRAM) {
if ((gd->arch.rev && (reg & BIT(3))) || !gd->arch.rev) {
writel(memcfg->tap,
ddr_regs + AR934X_DDR_REG_TAP_CTRL2);
writel(memcfg->tap,
ddr_regs + AR934X_DDR_REG_TAP_CTRL3);
}
}
writel(cycle, ddr_regs + AR71XX_DDR_REG_RD_CYCLE);
udelay(100);
writel(0x74444444, ddr_regs + AR934X_DDR_REG_BURST);
udelay(100);
writel(0x222, ddr_regs + AR934X_DDR_REG_BURST2);
udelay(100);
writel(0xfffff, ddr_regs + AR934X_DDR_REG_TIMEOUT_MAX);
udelay(100);
}
void ddr_tap_tuning(void)
{
}