1 // SPDX-License-Identifier: GPL-2.0+
3 * Freescale i.MX23/i.MX28 common code
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
8 * Based on code from LTIB:
9 * Copyright (C) 2010 Freescale Semiconductor, Inc.
18 #include <linux/delay.h>
19 #include <linux/errno.h>
21 #include <asm/arch/clock.h>
22 #include <asm/mach-imx/dma.h>
23 #include <asm/arch/gpio.h>
24 #include <asm/arch/iomux.h>
25 #include <asm/arch/imx-regs.h>
26 #include <asm/arch/sys_proto.h>
27 #include <linux/compiler.h>
29 DECLARE_GLOBAL_DATA_PTR;
31 /* Lowlevel init isn't used on i.MX28, so just have a dummy here */
32 __weak void lowlevel_init(void) {}
34 void reset_cpu(ulong ignored) __attribute__((noreturn));
36 void reset_cpu(ulong ignored)
38 struct mxs_rtc_regs *rtc_regs =
39 (struct mxs_rtc_regs *)MXS_RTC_BASE;
40 struct mxs_lcdif_regs *lcdif_regs =
41 (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
44 * Shut down the LCD controller as it interferes with BootROM boot mode
47 writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr);
49 /* Wait 1 uS before doing the actual watchdog reset */
50 writel(1, &rtc_regs->hw_rtc_watchdog);
51 writel(RTC_CTRL_WATCHDOGEN, &rtc_regs->hw_rtc_ctrl_set);
53 /* Endless loop, reset will exit from here */
59 * This function will craft a jumptable at 0x0 which will redirect interrupt
60 * vectoring to proper location of U-Boot in RAM.
62 * The structure of the jumptable will be as follows:
63 * ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times
64 * <destination address> ... for each previous ldr, thus also repeated 8 times
66 * The "ldr pc, [pc, #0x18]" instruction above loads address from memory at
67 * offset 0x18 from current value of PC register. Note that PC is already
68 * incremented by 4 when computing the offset, so the effective offset is
69 * actually 0x20, this the associated <destination address>. Loading the PC
70 * register with an address performs a jump to that address.
72 void mx28_fixup_vt(uint32_t start_addr)
74 /* ldr pc, [pc, #0x18] */
75 const uint32_t ldr_pc = 0xe59ff018;
76 /* Jumptable location is 0x0 */
77 uint32_t *vt = (uint32_t *)0x0;
80 for (i = 0; i < 8; i++) {
81 /* cppcheck-suppress nullPointer */
83 /* cppcheck-suppress nullPointer */
84 vt[i + 8] = start_addr + (4 * i);
88 #ifdef CONFIG_ARCH_MISC_INIT
89 int arch_misc_init(void)
91 mx28_fixup_vt(gd->relocaddr);
96 int arch_cpu_init(void)
98 struct mxs_clkctrl_regs *clkctrl_regs =
99 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
100 extern uint32_t _start;
102 mx28_fixup_vt((uint32_t)&_start);
108 writel(CLKCTRL_CLKSEQ_BYPASS_GPMI,
109 &clkctrl_regs->hw_clkctrl_clkseq_set);
111 /* Set GPMI clock to ref_xtal / 1 */
112 clrbits_le32(&clkctrl_regs->hw_clkctrl_gpmi, CLKCTRL_GPMI_CLKGATE);
113 while (readl(&clkctrl_regs->hw_clkctrl_gpmi) & CLKCTRL_GPMI_CLKGATE)
115 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_gpmi,
116 CLKCTRL_GPMI_DIV_MASK, 1);
121 * Configure GPIO unit
125 #ifdef CONFIG_APBH_DMA
133 u32 get_cpu_rev(void)
135 struct mxs_digctl_regs *digctl_regs =
136 (struct mxs_digctl_regs *)MXS_DIGCTL_BASE;
137 uint8_t rev = readl(&digctl_regs->hw_digctl_chipid) & 0x000000FF;
139 switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
140 case HW_DIGCTL_CHIPID_MX23:
147 return (MXC_CPU_MX23 << 12) | (rev + 0x10);
151 case HW_DIGCTL_CHIPID_MX28:
154 return (MXC_CPU_MX28 << 12) | 0x12;
163 #if defined(CONFIG_DISPLAY_CPUINFO)
164 const char *get_imx_type(u32 imxtype)
176 int print_cpuinfo(void)
179 struct mxs_spl_data *data = MXS_SPL_DATA;
181 cpurev = get_cpu_rev();
182 printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n",
183 get_imx_type((cpurev & 0xFF000) >> 12),
184 (cpurev & 0x000F0) >> 4,
185 (cpurev & 0x0000F) >> 0,
186 mxc_get_clock(MXC_ARM_CLK) / 1000000);
187 printf("BOOT: %s\n", mxs_boot_modes[data->boot_mode_idx].mode);
192 int do_mx28_showclocks(struct cmd_tbl *cmdtp, int flag, int argc,
195 printf("CPU: %3d MHz\n", mxc_get_clock(MXC_ARM_CLK) / 1000000);
196 printf("BUS: %3d MHz\n", mxc_get_clock(MXC_AHB_CLK) / 1000000);
197 printf("EMI: %3d MHz\n", mxc_get_clock(MXC_EMI_CLK));
198 printf("GPMI: %3d MHz\n", mxc_get_clock(MXC_GPMI_CLK) / 1000000);
203 * Initializes on-chip ethernet controllers.
205 #if defined(CONFIG_MX28) && defined(CONFIG_CMD_NET)
206 int cpu_eth_init(struct bd_info *bis)
208 struct mxs_clkctrl_regs *clkctrl_regs =
209 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
211 /* Turn on ENET clocks */
212 clrbits_le32(&clkctrl_regs->hw_clkctrl_enet,
213 CLKCTRL_ENET_SLEEP | CLKCTRL_ENET_DISABLE);
215 /* Set up ENET PLL for 50 MHz */
216 /* Power on ENET PLL */
217 writel(CLKCTRL_PLL2CTRL0_POWER,
218 &clkctrl_regs->hw_clkctrl_pll2ctrl0_set);
222 /* Gate on ENET PLL */
223 writel(CLKCTRL_PLL2CTRL0_CLKGATE,
224 &clkctrl_regs->hw_clkctrl_pll2ctrl0_clr);
226 /* Enable pad output */
227 setbits_le32(&clkctrl_regs->hw_clkctrl_enet, CLKCTRL_ENET_CLK_OUT_EN);
233 __weak void mx28_adjust_mac(int dev_id, unsigned char *mac)
236 mac[1] = 0x04; /* Use FSL vendor MAC address by default */
238 if (dev_id == 1) /* Let MAC1 be MAC0 + 1 by default */
242 #ifdef CONFIG_MX28_FEC_MAC_IN_OCOTP
244 #define MXS_OCOTP_MAX_TIMEOUT 1000000
245 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
247 struct mxs_ocotp_regs *ocotp_regs =
248 (struct mxs_ocotp_regs *)MXS_OCOTP_BASE;
253 writel(OCOTP_CTRL_RD_BANK_OPEN, &ocotp_regs->hw_ocotp_ctrl_set);
255 if (mxs_wait_mask_clr(&ocotp_regs->hw_ocotp_ctrl_reg, OCOTP_CTRL_BUSY,
256 MXS_OCOTP_MAX_TIMEOUT)) {
257 printf("MXS FEC: Can't get MAC from OCOTP\n");
261 data = readl(&ocotp_regs->hw_ocotp_cust0);
263 mac[2] = (data >> 24) & 0xff;
264 mac[3] = (data >> 16) & 0xff;
265 mac[4] = (data >> 8) & 0xff;
266 mac[5] = data & 0xff;
267 mx28_adjust_mac(dev_id, mac);
270 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
276 int mxs_dram_init(void)
278 struct mxs_spl_data *data = MXS_SPL_DATA;
280 if (data->mem_dram_size == 0) {
282 "Error, the RAM size passed up from SPL is 0!\n");
286 gd->ram_size = data->mem_dram_size;
291 clocks, CONFIG_SYS_MAXARGS, 1, do_mx28_showclocks,