1/* 2 * linux/arch/arm/plat-omap/common.c 3 * 4 * Code common to all OMAP machines. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10#include <linux/module.h> 11#include <linux/kernel.h> 12#include <linux/init.h> 13#include <linux/delay.h> 14#include <linux/pm.h> 15#include <linux/console.h> 16#include <linux/serial.h> 17#include <linux/tty.h> 18#include <linux/serial_8250.h> 19#include <linux/serial_reg.h> 20#include <linux/clk.h> 21 22#include <asm/hardware.h> 23#include <asm/system.h> 24#include <asm/pgtable.h> 25#include <asm/mach/map.h> 26#include <asm/io.h> 27#include <asm/setup.h> 28 29#include <asm/arch/board.h> 30#include <asm/arch/mux.h> 31#include <asm/arch/fpga.h> 32 33#include <asm/arch/clock.h> 34 35#define NO_LENGTH_CHECK 0xffffffff 36 37unsigned char omap_bootloader_tag[512]; 38int omap_bootloader_tag_len; 39 40struct omap_board_config_kernel *omap_board_config; 41int omap_board_config_size; 42 43static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out) 44{ 45 struct omap_board_config_kernel *kinfo = NULL; 46 int i; 47 48#ifdef CONFIG_OMAP_BOOT_TAG 49 struct omap_board_config_entry *info = NULL; 50 51 if (omap_bootloader_tag_len > 4) 52 info = (struct omap_board_config_entry *) omap_bootloader_tag; 53 while (info != NULL) { 54 u8 *next; 55 56 if (info->tag == tag) { 57 if (skip == 0) 58 break; 59 skip--; 60 } 61 62 if ((info->len & 0x03) != 0) { 63 /* We bail out to avoid an alignment fault */ 64 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n", 65 info->len, info->tag); 66 return NULL; 67 } 68 next = (u8 *) info + sizeof(*info) + info->len; 69 if (next >= omap_bootloader_tag + omap_bootloader_tag_len) 70 info = NULL; 71 else 72 info = (struct omap_board_config_entry *) next; 73 } 74 if (info != NULL) { 75 /* Check the length as a lame attempt to check for 76 * binary inconsistency. */ 77 if (len != NO_LENGTH_CHECK) { 78 /* Word-align len */ 79 if (len & 0x03) 80 len = (len + 3) & ~0x03; 81 if (info->len != len) { 82 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n", 83 tag, len, info->len); 84 return NULL; 85 } 86 } 87 if (len_out != NULL) 88 *len_out = info->len; 89 return info->data; 90 } 91#endif 92 /* Try to find the config from the board-specific structures 93 * in the kernel. */ 94 for (i = 0; i < omap_board_config_size; i++) { 95 if (omap_board_config[i].tag == tag) { 96 if (skip == 0) { 97 kinfo = &omap_board_config[i]; 98 break; 99 } else { 100 skip--; 101 } 102 } 103 } 104 if (kinfo == NULL) 105 return NULL; 106 return kinfo->data; 107} 108 109const void *__omap_get_config(u16 tag, size_t len, int nr) 110{ 111 return get_config(tag, len, nr, NULL); 112} 113EXPORT_SYMBOL(__omap_get_config); 114 115const void *omap_get_var_config(u16 tag, size_t *len) 116{ 117 return get_config(tag, NO_LENGTH_CHECK, 0, len); 118} 119EXPORT_SYMBOL(omap_get_var_config); 120 121static int __init omap_add_serial_console(void) 122{ 123 const struct omap_serial_console_config *con_info; 124 const struct omap_uart_config *uart_info; 125 static char speed[11], *opt = NULL; 126 int line, i, uart_idx; 127 128 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config); 129 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE, 130 struct omap_serial_console_config); 131 if (uart_info == NULL || con_info == NULL) 132 return 0; 133 134 if (con_info->console_uart == 0) 135 return 0; 136 137 if (con_info->console_speed) { 138 snprintf(speed, sizeof(speed), "%u", con_info->console_speed); 139 opt = speed; 140 } 141 142 uart_idx = con_info->console_uart - 1; 143 if (uart_idx >= OMAP_MAX_NR_PORTS) { 144 printk(KERN_INFO "Console: external UART#%d. " 145 "Not adding it as console this time.\n", 146 uart_idx + 1); 147 return 0; 148 } 149 if (!(uart_info->enabled_uarts & (1 << uart_idx))) { 150 printk(KERN_ERR "Console: Selected UART#%d is " 151 "not enabled for this platform\n", 152 uart_idx + 1); 153 return -1; 154 } 155 line = 0; 156 for (i = 0; i < uart_idx; i++) { 157 if (uart_info->enabled_uarts & (1 << i)) 158 line++; 159 } 160 return add_preferred_console("ttyS", line, opt); 161} 162console_initcall(omap_add_serial_console); 163 164 165/* 166 * 32KHz clocksource ... always available, on pretty most chips except 167 * OMAP 730 and 1510. Other timers could be used as clocksources, with 168 * higher resolution in free-running counter modes (e.g. 12 MHz xtal), 169 * but systems won't necessarily want to spend resources that way. 170 */ 171 172#if defined(CONFIG_ARCH_OMAP16XX) 173#define TIMER_32K_SYNCHRONIZED 0xfffbc410 174#elif defined(CONFIG_ARCH_OMAP24XX) 175#define TIMER_32K_SYNCHRONIZED 0x48004010 176#endif 177 178#ifdef TIMER_32K_SYNCHRONIZED 179 180#include <linux/clocksource.h> 181 182static cycle_t omap_32k_read(void) 183{ 184 return omap_readl(TIMER_32K_SYNCHRONIZED); 185} 186 187static struct clocksource clocksource_32k = { 188 .name = "32k_counter", 189 .rating = 250, 190 .read = omap_32k_read, 191 .mask = CLOCKSOURCE_MASK(32), 192 .shift = 10, 193 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 194}; 195 196static int __init omap_init_clocksource_32k(void) 197{ 198 static char err[] __initdata = KERN_ERR 199 "%s: can't register clocksource!\n"; 200 201 if (cpu_is_omap16xx() || cpu_is_omap24xx()) { 202 clocksource_32k.mult = clocksource_hz2mult(32768, 203 clocksource_32k.shift); 204 205 if (clocksource_register(&clocksource_32k)) 206 printk(err, clocksource_32k.name); 207 } 208 return 0; 209} 210arch_initcall(omap_init_clocksource_32k); 211 212#endif /* TIMER_32K_SYNCHRONIZED */ 213