target/linux/adm8668/files/arch/mips/adm8668/prom.c

   1 /*
   2  * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
   3  *
   4  * based on work of rb532 prom.c
   5  *  Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
   6  *  Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
   7  *  Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
   8  *                      Felix Fietkau <nbd@openwrt.org>
   9  *                      Florian Fainelli <florian@openwrt.org>
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/console.h>
  20 #include <linux/string.h>
  21 #include <linux/serial_core.h>
  22 #include <asm/bootinfo.h>
  23 #include <adm8668.h>
  24 #include "u-boot.h"
  25
  26 register volatile struct global_data *gd asm ("k0");
  27
  28 #ifdef CONFIG_SERIAL_ADM8668_CONSOLE
  29 static inline unsigned int adm_uart_readl(unsigned int offset)
  30 {
  31         return (*(volatile unsigned int *)(0xbe400000 + offset));
  32 }
  33
  34 static inline void adm_uart_writel(unsigned int value, unsigned int offset)
  35 {
  36         (*((volatile unsigned int *)(0xbe400000 + offset))) = value;
  37 }
  38
  39 static void prom_putchar(char c)
  40 {
  41         adm_uart_writel(c, UART_DR_REG);
  42         while ((adm_uart_readl(UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
  43                 ;
  44 }
  45
  46 static void __init
  47 early_console_write(struct console *con, const char *s, unsigned n)
  48 {
  49         while (n-- && *s) {
  50                 if (*s == '\n')
  51                         prom_putchar('\r');
  52                 prom_putchar(*s);
  53                 s++;
  54         }
  55 }
  56
  57 static struct console early_console __initdata = {
  58         .name   = "early",
  59         .write  = early_console_write,
  60         .flags  = CON_BOOT,
  61         .index  = -1
  62 };
  63
  64 #endif
  65
  66 void __init prom_free_prom_memory(void)
  67 {
  68         /* No prom memory to free */
  69 }
  70
  71 static inline int match_tag(char *arg, const char *tag)
  72 {
  73         return strncmp(arg, tag, strlen(tag)) == 0;
  74 }
  75
  76 static inline unsigned long tag2ul(char *arg, const char *tag)
  77 {
  78         char *num;
  79
  80         num = arg + strlen(tag);
  81         return simple_strtoul(num, 0, 10);
  82 }
  83
  84 void __init prom_setup_cmdline(void)
  85 {
  86         char *cp;
  87         int prom_argc;
  88         char **prom_argv;
  89         int i;
  90
  91         prom_argc = fw_arg0;
  92         prom_argv = (char **)KSEG0ADDR(fw_arg1);
  93
  94         cp = &(arcs_cmdline[0]);
  95         for (i = 1; i < prom_argc; i++) {
  96                 prom_argv[i] = (char *)KSEG0ADDR(prom_argv[i]);
  97
  98                 /* default bootargs has "console=/dev/ttyS0" yet console won't
  99                  * show up at all if you include the '/dev/' nowadays ... */
 100                 if (match_tag(prom_argv[i], "console=/dev/")) {
 101                         char *ptr = prom_argv[i] + strlen("console=/dev/");
 102
 103                         strcpy(cp, "console=");
 104                         cp += strlen("console=");
 105                         strcpy(cp, ptr);
 106                         cp += strlen(ptr);
 107                         *cp++ = ' ';
 108                         continue;
 109                 }
 110                 strcpy(cp, prom_argv[i]);
 111                 cp += strlen(prom_argv[i]);
 112                 *cp++ = ' ';
 113         }
 114         if (prom_argc > 1)
 115                 --cp; /* trailing space */
 116
 117         *cp = '\0';
 118 }
 119
 120 void __init prom_init(void)
 121 {
 122         bd_t *bd = gd->bd;
 123         int memsize;
 124
 125 #ifdef CONFIG_SERIAL_ADM8668_CONSOLE
 126         register_console(&early_console);
 127 #endif
 128
 129         memsize = bd->bi_memsize;
 130         printk("Board info:\n");
 131         printk("  RAM size: %d MB\n", (int)memsize/(1024*1024));
 132         printk("  NOR start: %#lx\n", bd->bi_flashstart);
 133         printk("  NOR size: %#lx\n", bd->bi_flashsize);
 134
 135         prom_setup_cmdline();
 136         add_memory_region(0, memsize, BOOT_MEM_RAM);
 137 }