LXR uboot/arch/arm/cpu/arm926ejs/spear/spl

   1/*
   2 * (C) Copyright 2000-2009
   3 * Vipin Kumar, ST Microelectronics, vipin.kumar@st.com
   4 *
   5 * Copyright (C) 2012 Stefan Roese <sr@denx.de>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <image.h>
  12#include <linux/compiler.h>
  13#include <asm/io.h>
  14#include <asm/arch/spr_defs.h>
  15#include <linux/mtd/st_smi.h>
  16
  17static const char kernel_name[] = "Linux";
  18static const char loader_name[] = "U-Boot";
  19
  20int image_check_header(image_header_t *hdr, const char *name)
  21{
  22        if (image_check_magic(hdr) &&
  23            (!strncmp(image_get_name(hdr), name, strlen(name))) &&
  24            image_check_hcrc(hdr)) {
  25                return 1;
  26        }
  27        return 0;
  28}
  29
  30int image_check_data(image_header_t *hdr)
  31{
  32        if (image_check_dcrc(hdr))
  33                return 1;
  34
  35        return 0;
  36}
  37
  38/*
  39 * SNOR (Serial NOR flash) related functions
  40 */
  41void snor_init(void)
  42{
  43        struct smi_regs *const smicntl =
  44                (struct smi_regs * const)CONFIG_SYS_SMI_BASE;
  45
  46        /* Setting the fast mode values. SMI working at 166/4 = 41.5 MHz */
  47        writel(HOLD1 | FAST_MODE | BANK_EN | DSEL_TIME | PRESCAL4,
  48               &smicntl->smi_cr1);
  49}
  50
  51static int snor_image_load(u8 *load_addr, void (**image_p)(void),
  52                           const char *image_name)
  53{
  54        image_header_t *header;
  55
  56        /*
  57         * Since calculating the crc in the SNOR flash does not
  58         * work, we copy the image to the destination address
  59         * minus the header size. And point the header to this
  60         * new destination. This will not work for address 0
  61         * of course.
  62         */
  63        header = (image_header_t *)load_addr;
  64        memcpy((ulong *)(image_get_load(header) - sizeof(image_header_t)),
  65               (const ulong *)load_addr,
  66               image_get_data_size(header) + sizeof(image_header_t));
  67        header = (image_header_t *)(image_get_load(header) -
  68                                    sizeof(image_header_t));
  69
  70        if (image_check_header(header, image_name)) {
  71                if (image_check_data(header)) {
  72                        /* Jump to boot image */
  73                        *image_p = (void *)image_get_load(header);
  74                        return 1;
  75                }
  76        }
  77
  78        return 0;
  79}
  80
  81static void boot_image(void (*image)(void))
  82{
  83        void (*funcp)(void) __noreturn = (void *)image;
  84
  85        (*funcp)();
  86}
  87
  88/*
  89 * spl_boot:
  90 *
  91 * All supported booting types of all supported SoCs are listed here.
  92 * Generic readback APIs are provided for each supported booting type
  93 * eg. nand_read_skip_bad
  94 */
  95u32 spl_boot(void)
  96{
  97        void (*image)(void);
  98
  99#ifdef CONFIG_SPEAR_USBTTY
 100        plat_late_init();
 101        return 1;
 102#endif
 103
 104        /*
 105         * All the supported booting devices are listed here. Each of
 106         * the booting type supported by the platform would define the
 107         * macro xxx_BOOT_SUPPORTED to true.
 108         */
 109
 110        if (SNOR_BOOT_SUPPORTED && snor_boot_selected()) {
 111                /* SNOR-SMI initialization */
 112                snor_init();
 113
 114                serial_puts("Booting via SNOR\n");
 115                /* Serial NOR booting */
 116                if (1 == snor_image_load((u8 *)CONFIG_SYS_UBOOT_BASE,
 117                                            &image, loader_name)) {
 118                        /* Platform related late initialasations */
 119                        plat_late_init();
 120
 121                        /* Jump to boot image */
 122                        serial_puts("Jumping to U-Boot\n");
 123                        boot_image(image);
 124                        return 1;
 125                }
 126        }
 127
 128        if (NAND_BOOT_SUPPORTED && nand_boot_selected()) {
 129                /* NAND booting */
 130                /* Not ported from XLoader to SPL yet */
 131                return 0;
 132        }
 133
 134        if (PNOR_BOOT_SUPPORTED && pnor_boot_selected()) {
 135                /* PNOR booting */
 136                /* Not ported from XLoader to SPL yet */
 137                return 0;
 138        }
 139
 140        if (MMC_BOOT_SUPPORTED && mmc_boot_selected()) {
 141                /* MMC booting */
 142                /* Not ported from XLoader to SPL yet */
 143                return 0;
 144        }
 145
 146        if (SPI_BOOT_SUPPORTED && spi_boot_selected()) {
 147                /* SPI booting */
 148                /* Not supported for any platform as of now */
 149                return 0;
 150        }
 151
 152        if (I2C_BOOT_SUPPORTED && i2c_boot_selected()) {
 153                /* I2C booting */
 154                /* Not supported for any platform as of now */
 155                return 0;
 156        }
 157
 158        /*
 159         * All booting types without memory are listed as below
 160         * Control has to be returned to BootROM in case of all
 161         * the following booting scenarios
 162         */
 163
 164        if (USB_BOOT_SUPPORTED && usb_boot_selected()) {
 165                plat_late_init();
 166                return 1;
 167        }
 168
 169        if (TFTP_BOOT_SUPPORTED && tftp_boot_selected()) {
 170                plat_late_init();
 171                return 1;
 172        }
 173
 174        if (UART_BOOT_SUPPORTED && uart_boot_selected()) {
 175                plat_late_init();
 176                return 1;
 177        }
 178
 179        /* Ideally, the control should not reach here. */
 180        hang();
 181}
 182