mirror of
https://github.com/AsahiLinux/u-boot
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b83120df79
When imx28_xea_defconfig is built with LTO, the compiler complains about the two different declarations of _start: include/asm-generic/sections.h as extern void _start(void); arch/arm/cpu/arm926ejs/mxs/mxs.c as extern uint32_t _start; Fix this. Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
295 lines
6.7 KiB
C
295 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Freescale i.MX23/i.MX28 common code
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* Based on code from LTIB:
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* Copyright (C) 2010 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <command.h>
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#include <cpu_func.h>
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#include <hang.h>
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#include <init.h>
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#include <net.h>
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#include <asm/global_data.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/mach-imx/dma.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/iomux.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/sections.h>
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#include <linux/compiler.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Lowlevel init isn't used on i.MX28, so just have a dummy here */
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__weak void lowlevel_init(void) {}
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void reset_cpu(void) __attribute__((noreturn));
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void reset_cpu(void)
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{
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struct mxs_rtc_regs *rtc_regs =
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(struct mxs_rtc_regs *)MXS_RTC_BASE;
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struct mxs_lcdif_regs *lcdif_regs =
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(struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
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/*
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* Shut down the LCD controller as it interferes with BootROM boot mode
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* pads sampling.
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*/
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writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr);
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/* Wait 1 uS before doing the actual watchdog reset */
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writel(1, &rtc_regs->hw_rtc_watchdog);
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writel(RTC_CTRL_WATCHDOGEN, &rtc_regs->hw_rtc_ctrl_set);
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/* Endless loop, reset will exit from here */
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for (;;)
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;
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}
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/*
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* This function will craft a jumptable at 0x0 which will redirect interrupt
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* vectoring to proper location of U-Boot in RAM.
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*
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* The structure of the jumptable will be as follows:
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* ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times
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* <destination address> ... for each previous ldr, thus also repeated 8 times
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*
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* The "ldr pc, [pc, #0x18]" instruction above loads address from memory at
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* offset 0x18 from current value of PC register. Note that PC is already
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* incremented by 4 when computing the offset, so the effective offset is
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* actually 0x20, this the associated <destination address>. Loading the PC
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* register with an address performs a jump to that address.
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*/
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void mx28_fixup_vt(uint32_t start_addr)
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{
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/* ldr pc, [pc, #0x18] */
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const uint32_t ldr_pc = 0xe59ff018;
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/* Jumptable location is 0x0 */
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uint32_t *vt = (uint32_t *)0x0;
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int i;
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for (i = 0; i < 8; i++) {
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/* cppcheck-suppress nullPointer */
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vt[i] = ldr_pc;
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/* cppcheck-suppress nullPointer */
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vt[i + 8] = start_addr + (4 * i);
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}
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}
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#ifdef CONFIG_ARCH_MISC_INIT
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int arch_misc_init(void)
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{
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mx28_fixup_vt(gd->relocaddr);
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return 0;
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}
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#endif
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int arch_cpu_init(void)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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mx28_fixup_vt((uint32_t)&_start);
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/*
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* Enable NAND clock
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*/
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/* Set bypass bit */
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writel(CLKCTRL_CLKSEQ_BYPASS_GPMI,
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&clkctrl_regs->hw_clkctrl_clkseq_set);
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/* Set GPMI clock to ref_xtal / 1 */
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clrbits_le32(&clkctrl_regs->hw_clkctrl_gpmi, CLKCTRL_GPMI_CLKGATE);
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while (readl(&clkctrl_regs->hw_clkctrl_gpmi) & CLKCTRL_GPMI_CLKGATE)
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;
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clrsetbits_le32(&clkctrl_regs->hw_clkctrl_gpmi,
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CLKCTRL_GPMI_DIV_MASK, 1);
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udelay(1000);
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/*
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* Configure GPIO unit
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*/
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mxs_gpio_init();
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#ifdef CONFIG_APBH_DMA
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/* Start APBH DMA */
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mxs_dma_init();
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#endif
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return 0;
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}
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u32 get_cpu_rev(void)
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{
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struct mxs_digctl_regs *digctl_regs =
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(struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
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uint8_t rev = readl(&digctl_regs->hw_digctl_chipid) & 0x000000FF;
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switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
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case HW_DIGCTL_CHIPID_MX23:
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switch (rev) {
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case 0x0:
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case 0x1:
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case 0x2:
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case 0x3:
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case 0x4:
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return (MXC_CPU_MX23 << 12) | (rev + 0x10);
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default:
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return 0;
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}
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case HW_DIGCTL_CHIPID_MX28:
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switch (rev) {
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case 0x1:
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return (MXC_CPU_MX28 << 12) | 0x12;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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#if defined(CONFIG_DISPLAY_CPUINFO)
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const char *get_imx_type(u32 imxtype)
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{
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switch (imxtype) {
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case MXC_CPU_MX23:
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return "23";
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case MXC_CPU_MX28:
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return "28";
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default:
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return "??";
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}
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}
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int print_cpuinfo(void)
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{
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u32 cpurev;
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struct mxs_spl_data *data = MXS_SPL_DATA;
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cpurev = get_cpu_rev();
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printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n",
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get_imx_type((cpurev & 0xFF000) >> 12),
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(cpurev & 0x000F0) >> 4,
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(cpurev & 0x0000F) >> 0,
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mxc_get_clock(MXC_ARM_CLK) / 1000000);
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printf("BOOT: %s\n", mxs_boot_modes[data->boot_mode_idx].mode);
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return 0;
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}
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#endif
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int do_mx28_showclocks(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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printf("CPU: %3d MHz\n", mxc_get_clock(MXC_ARM_CLK) / 1000000);
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printf("BUS: %3d MHz\n", mxc_get_clock(MXC_AHB_CLK) / 1000000);
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printf("EMI: %3d MHz\n", mxc_get_clock(MXC_EMI_CLK));
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printf("GPMI: %3d MHz\n", mxc_get_clock(MXC_GPMI_CLK) / 1000000);
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return 0;
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}
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/*
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* Initializes on-chip ethernet controllers.
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*/
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#if defined(CONFIG_MX28) && defined(CONFIG_CMD_NET)
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int cpu_eth_init(struct bd_info *bis)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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/* Turn on ENET clocks */
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clrbits_le32(&clkctrl_regs->hw_clkctrl_enet,
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CLKCTRL_ENET_SLEEP | CLKCTRL_ENET_DISABLE);
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/* Set up ENET PLL for 50 MHz */
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/* Power on ENET PLL */
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writel(CLKCTRL_PLL2CTRL0_POWER,
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&clkctrl_regs->hw_clkctrl_pll2ctrl0_set);
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udelay(10);
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/* Gate on ENET PLL */
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writel(CLKCTRL_PLL2CTRL0_CLKGATE,
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&clkctrl_regs->hw_clkctrl_pll2ctrl0_clr);
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/* Enable pad output */
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setbits_le32(&clkctrl_regs->hw_clkctrl_enet, CLKCTRL_ENET_CLK_OUT_EN);
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return 0;
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}
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#endif
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__weak void mx28_adjust_mac(int dev_id, unsigned char *mac)
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{
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mac[0] = 0x00;
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mac[1] = 0x04; /* Use FSL vendor MAC address by default */
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if (dev_id == 1) /* Let MAC1 be MAC0 + 1 by default */
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mac[5] += 1;
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}
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#ifdef CONFIG_MX28_FEC_MAC_IN_OCOTP
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#define MXS_OCOTP_MAX_TIMEOUT 1000000
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void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
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{
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struct mxs_ocotp_regs *ocotp_regs =
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(struct mxs_ocotp_regs *)MXS_OCOTP_BASE;
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uint32_t data;
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memset(mac, 0, 6);
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writel(OCOTP_CTRL_RD_BANK_OPEN, &ocotp_regs->hw_ocotp_ctrl_set);
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if (mxs_wait_mask_clr(&ocotp_regs->hw_ocotp_ctrl_reg, OCOTP_CTRL_BUSY,
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MXS_OCOTP_MAX_TIMEOUT)) {
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printf("MXS FEC: Can't get MAC from OCOTP\n");
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return;
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}
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data = readl(&ocotp_regs->hw_ocotp_cust0);
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mac[2] = (data >> 24) & 0xff;
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mac[3] = (data >> 16) & 0xff;
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mac[4] = (data >> 8) & 0xff;
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mac[5] = data & 0xff;
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mx28_adjust_mac(dev_id, mac);
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}
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#else
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void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
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{
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memset(mac, 0, 6);
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}
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#endif
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int mxs_dram_init(void)
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{
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struct mxs_spl_data *data = MXS_SPL_DATA;
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if (data->mem_dram_size == 0) {
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printf("MXS:\n"
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"Error, the RAM size passed up from SPL is 0!\n");
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hang();
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}
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gd->ram_size = data->mem_dram_size;
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return 0;
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}
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U_BOOT_CMD(
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clocks, CONFIG_SYS_MAXARGS, 1, do_mx28_showclocks,
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"display clocks",
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""
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);
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