u-boot/arch/arm/cpu/arm926ejs/mxs/mxs.c

345 lines
7.8 KiB
C
Raw Normal View History

/*
* Freescale i.MX28 common code
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* Copyright (C) 2010 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/dma.h>
#include <asm/arch/gpio.h>
#include <asm/arch/iomux.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
DECLARE_GLOBAL_DATA_PTR;
/* 1 second delay should be plenty of time for block reset. */
#define RESET_MAX_TIMEOUT 1000000
#define MXS_BLOCK_SFTRST (1 << 31)
#define MXS_BLOCK_CLKGATE (1 << 30)
/* Lowlevel init isn't used on i.MX28, so just have a dummy here */
inline void lowlevel_init(void) {}
void reset_cpu(ulong ignored) __attribute__((noreturn));
void reset_cpu(ulong ignored)
{
struct mxs_rtc_regs *rtc_regs =
(struct mxs_rtc_regs *)MXS_RTC_BASE;
struct mxs_lcdif_regs *lcdif_regs =
(struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
/*
* Shut down the LCD controller as it interferes with BootROM boot mode
* pads sampling.
*/
writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr);
/* Wait 1 uS before doing the actual watchdog reset */
writel(1, &rtc_regs->hw_rtc_watchdog);
writel(RTC_CTRL_WATCHDOGEN, &rtc_regs->hw_rtc_ctrl_set);
/* Endless loop, reset will exit from here */
for (;;)
;
}
void enable_caches(void)
{
#ifndef CONFIG_SYS_ICACHE_OFF
icache_enable();
#endif
#ifndef CONFIG_SYS_DCACHE_OFF
dcache_enable();
#endif
}
int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
int timeout)
{
while (--timeout) {
if ((readl(&reg->reg) & mask) == mask)
break;
udelay(1);
}
return !timeout;
}
int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
int timeout)
{
while (--timeout) {
if ((readl(&reg->reg) & mask) == 0)
break;
udelay(1);
}
return !timeout;
}
int mxs_reset_block(struct mxs_register_32 *reg)
{
/* Clear SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
return 1;
/* Clear CLKGATE */
writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
/* Set SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_set);
/* Wait for CLKGATE being set */
if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
return 1;
/* Clear SFTRST */
writel(MXS_BLOCK_SFTRST, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
return 1;
/* Clear CLKGATE */
writel(MXS_BLOCK_CLKGATE, &reg->reg_clr);
if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
return 1;
return 0;
}
void mx28_fixup_vt(uint32_t start_addr)
{
uint32_t *vt = (uint32_t *)0x20;
int i;
for (i = 0; i < 8; i++)
vt[i] = start_addr + (4 * i);
}
#ifdef CONFIG_ARCH_MISC_INIT
int arch_misc_init(void)
{
mx28_fixup_vt(gd->relocaddr);
return 0;
}
#endif
int arch_cpu_init(void)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
extern uint32_t _start;
mx28_fixup_vt((uint32_t)&_start);
/*
* Enable NAND clock
*/
/* Clear bypass bit */
writel(CLKCTRL_CLKSEQ_BYPASS_GPMI,
&clkctrl_regs->hw_clkctrl_clkseq_set);
/* Set GPMI clock to ref_gpmi / 12 */
clrsetbits_le32(&clkctrl_regs->hw_clkctrl_gpmi,
CLKCTRL_GPMI_CLKGATE | CLKCTRL_GPMI_DIV_MASK, 1);
udelay(1000);
/*
* Configure GPIO unit
*/
mxs_gpio_init();
#ifdef CONFIG_APBH_DMA
/* Start APBH DMA */
mxs_dma_init();
#endif
return 0;
}
#if defined(CONFIG_DISPLAY_CPUINFO)
static const char *get_cpu_type(void)
{
struct mxs_digctl_regs *digctl_regs =
(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
case HW_DIGCTL_CHIPID_MX28:
return "28";
default:
return "??";
}
}
static const char *get_cpu_rev(void)
{
struct mxs_digctl_regs *digctl_regs =
(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
uint8_t rev = readl(&digctl_regs->hw_digctl_chipid) & 0x000000FF;
switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
case HW_DIGCTL_CHIPID_MX28:
switch (rev) {
case 0x1:
return "1.2";
default:
return "??";
}
default:
return "??";
}
}
int print_cpuinfo(void)
{
struct mxs_spl_data *data = (struct mxs_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
printf("CPU: Freescale i.MX%s rev%s at %d MHz\n",
get_cpu_type(),
get_cpu_rev(),
mxc_get_clock(MXC_ARM_CLK) / 1000000);
printf("BOOT: %s\n", mxs_boot_modes[data->boot_mode_idx].mode);
return 0;
}
#endif
int do_mx28_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
printf("CPU: %3d MHz\n", mxc_get_clock(MXC_ARM_CLK) / 1000000);
printf("BUS: %3d MHz\n", mxc_get_clock(MXC_AHB_CLK) / 1000000);
printf("EMI: %3d MHz\n", mxc_get_clock(MXC_EMI_CLK));
printf("GPMI: %3d MHz\n", mxc_get_clock(MXC_GPMI_CLK) / 1000000);
return 0;
}
/*
* Initializes on-chip ethernet controllers.
*/
#if defined(CONFIG_MX28) && defined(CONFIG_CMD_NET)
int cpu_eth_init(bd_t *bis)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
/* Turn on ENET clocks */
clrbits_le32(&clkctrl_regs->hw_clkctrl_enet,
CLKCTRL_ENET_SLEEP | CLKCTRL_ENET_DISABLE);
/* Set up ENET PLL for 50 MHz */
/* Power on ENET PLL */
writel(CLKCTRL_PLL2CTRL0_POWER,
&clkctrl_regs->hw_clkctrl_pll2ctrl0_set);
udelay(10);
/* Gate on ENET PLL */
writel(CLKCTRL_PLL2CTRL0_CLKGATE,
&clkctrl_regs->hw_clkctrl_pll2ctrl0_clr);
/* Enable pad output */
setbits_le32(&clkctrl_regs->hw_clkctrl_enet, CLKCTRL_ENET_CLK_OUT_EN);
return 0;
}
#endif
static void __mx28_adjust_mac(int dev_id, unsigned char *mac)
{
mac[0] = 0x00;
mac[1] = 0x04; /* Use FSL vendor MAC address by default */
if (dev_id == 1) /* Let MAC1 be MAC0 + 1 by default */
mac[5] += 1;
}
void mx28_adjust_mac(int dev_id, unsigned char *mac)
__attribute__((weak, alias("__mx28_adjust_mac")));
#ifdef CONFIG_MX28_FEC_MAC_IN_OCOTP
#define MXS_OCOTP_MAX_TIMEOUT 1000000
void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
{
struct mxs_ocotp_regs *ocotp_regs =
(struct mxs_ocotp_regs *)MXS_OCOTP_BASE;
uint32_t data;
memset(mac, 0, 6);
writel(OCOTP_CTRL_RD_BANK_OPEN, &ocotp_regs->hw_ocotp_ctrl_set);
if (mxs_wait_mask_clr(&ocotp_regs->hw_ocotp_ctrl_reg, OCOTP_CTRL_BUSY,
MXS_OCOTP_MAX_TIMEOUT)) {
printf("MXS FEC: Can't get MAC from OCOTP\n");
return;
}
data = readl(&ocotp_regs->hw_ocotp_cust0);
mac[2] = (data >> 24) & 0xff;
mac[3] = (data >> 16) & 0xff;
mac[4] = (data >> 8) & 0xff;
mac[5] = data & 0xff;
mx28_adjust_mac(dev_id, mac);
}
#else
void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
{
memset(mac, 0, 6);
}
#endif
int mxs_dram_init(void)
{
struct mxs_spl_data *data = (struct mxs_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
if (data->mem_dram_size == 0) {
printf("MXS:\n"
"Error, the RAM size passed up from SPL is 0!\n");
hang();
}
gd->ram_size = data->mem_dram_size;
return 0;
}
U_BOOT_CMD(
clocks, CONFIG_SYS_MAXARGS, 1, do_mx28_showclocks,
"display clocks",
""
);