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

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/*
* Freescale i.MX23/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.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/imx-common/dma.h>
#include <asm/arch/gpio.h>
#include <asm/arch/iomux.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
/* Lowlevel init isn't used on i.MX28, so just have a dummy here */
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
}
/*
* This function will craft a jumptable at 0x0 which will redirect interrupt
* vectoring to proper location of U-Boot in RAM.
*
* The structure of the jumptable will be as follows:
* ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times
* <destination address> ... for each previous ldr, thus also repeated 8 times
*
* The "ldr pc, [pc, #0x18]" instruction above loads address from memory at
* offset 0x18 from current value of PC register. Note that PC is already
* incremented by 4 when computing the offset, so the effective offset is
* actually 0x20, this the associated <destination address>. Loading the PC
* register with an address performs a jump to that address.
*/
void mx28_fixup_vt(uint32_t start_addr)
{
/* ldr pc, [pc, #0x18] */
const uint32_t ldr_pc = 0xe59ff018;
/* Jumptable location is 0x0 */
uint32_t *vt = (uint32_t *)0x0;
int i;
for (i = 0; i < 8; i++) {
/* cppcheck-suppress nullPointer */
vt[i] = ldr_pc;
/* cppcheck-suppress nullPointer */
vt[i + 8] = 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;
}
u32 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_MX23:
switch (rev) {
case 0x0:
case 0x1:
case 0x2:
case 0x3:
case 0x4:
return (MXC_CPU_MX23 << 12) | (rev + 0x10);
default:
return 0;
}
case HW_DIGCTL_CHIPID_MX28:
switch (rev) {
case 0x1:
return (MXC_CPU_MX28 << 12) | 0x12;
default:
return 0;
}
default:
return 0;
}
}
#if defined(CONFIG_DISPLAY_CPUINFO)
const char *get_imx_type(u32 imxtype)
{
switch (imxtype) {
case MXC_CPU_MX23:
return "23";
case MXC_CPU_MX28:
return "28";
default:
return "??";
}
}
int print_cpuinfo(void)
{
u32 cpurev;
struct mxs_spl_data *data = (struct mxs_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
cpurev = get_cpu_rev();
printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n",
get_imx_type((cpurev & 0xFF000) >> 12),
(cpurev & 0x000F0) >> 4,
(cpurev & 0x0000F) >> 0,
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
__weak 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;
}
#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",
""
);