diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs/mxs.c')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/mxs.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/mxs.c b/arch/arm/cpu/arm926ejs/mxs/mxs.c new file mode 100644 index 000000000..6ce8019b8 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/mxs/mxs.c @@ -0,0 +1,344 @@ +/* + * 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) & 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) & mask) == 0) + break; + udelay(1); + } + + return !timeout; +} + +int mxs_reset_block(struct mxs_register_32 *reg) +{ + /* Clear SFTRST */ + writel(MXS_BLOCK_SFTRST, ®->reg_clr); + + if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) + return 1; + + /* Clear CLKGATE */ + writel(MXS_BLOCK_CLKGATE, ®->reg_clr); + + /* Set SFTRST */ + writel(MXS_BLOCK_SFTRST, ®->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_clr); + + if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) + return 1; + + /* Clear CLKGATE */ + writel(MXS_BLOCK_CLKGATE, ®->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", + "" +); |