f8ce25476d
This is needs to be visible to other architectures using the AMBA bus and peripherals. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
159 lines
4 KiB
C
159 lines
4 KiB
C
/*
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* linux/arch/arm/plat-omap/common.c
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*
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* Code common to all OMAP machines.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/console.h>
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#include <linux/serial.h>
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#include <linux/tty.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_reg.h>
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#include <linux/clk.h>
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#include <asm/hardware.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/mach/map.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#include <asm/arch/board.h>
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#include <asm/arch/mux.h>
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#include <asm/arch/fpga.h>
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#include <asm/arch/clock.h>
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#define NO_LENGTH_CHECK 0xffffffff
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unsigned char omap_bootloader_tag[512];
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int omap_bootloader_tag_len;
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struct omap_board_config_kernel *omap_board_config;
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int omap_board_config_size;
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static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
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{
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struct omap_board_config_kernel *kinfo = NULL;
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int i;
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#ifdef CONFIG_OMAP_BOOT_TAG
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struct omap_board_config_entry *info = NULL;
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if (omap_bootloader_tag_len > 4)
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info = (struct omap_board_config_entry *) omap_bootloader_tag;
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while (info != NULL) {
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u8 *next;
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if (info->tag == tag) {
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if (skip == 0)
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break;
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skip--;
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}
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if ((info->len & 0x03) != 0) {
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/* We bail out to avoid an alignment fault */
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printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
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info->len, info->tag);
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return NULL;
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}
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next = (u8 *) info + sizeof(*info) + info->len;
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if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
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info = NULL;
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else
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info = (struct omap_board_config_entry *) next;
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}
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if (info != NULL) {
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/* Check the length as a lame attempt to check for
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* binary inconsistancy. */
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if (len != NO_LENGTH_CHECK) {
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/* Word-align len */
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if (len & 0x03)
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len = (len + 3) & ~0x03;
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if (info->len != len) {
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printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
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tag, len, info->len);
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return NULL;
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}
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}
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if (len_out != NULL)
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*len_out = info->len;
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return info->data;
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}
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#endif
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/* Try to find the config from the board-specific structures
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* in the kernel. */
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for (i = 0; i < omap_board_config_size; i++) {
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if (omap_board_config[i].tag == tag) {
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kinfo = &omap_board_config[i];
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break;
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}
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}
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if (kinfo == NULL)
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return NULL;
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return kinfo->data;
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}
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const void *__omap_get_config(u16 tag, size_t len, int nr)
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{
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return get_config(tag, len, nr, NULL);
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}
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EXPORT_SYMBOL(__omap_get_config);
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const void *omap_get_var_config(u16 tag, size_t *len)
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{
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return get_config(tag, NO_LENGTH_CHECK, 0, len);
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}
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EXPORT_SYMBOL(omap_get_var_config);
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static int __init omap_add_serial_console(void)
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{
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const struct omap_serial_console_config *con_info;
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const struct omap_uart_config *uart_info;
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static char speed[11], *opt = NULL;
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int line, i, uart_idx;
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uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
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con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
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struct omap_serial_console_config);
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if (uart_info == NULL || con_info == NULL)
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return 0;
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if (con_info->console_uart == 0)
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return 0;
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if (con_info->console_speed) {
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snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
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opt = speed;
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}
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uart_idx = con_info->console_uart - 1;
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if (uart_idx >= OMAP_MAX_NR_PORTS) {
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printk(KERN_INFO "Console: external UART#%d. "
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"Not adding it as console this time.\n",
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uart_idx + 1);
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return 0;
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}
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if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
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printk(KERN_ERR "Console: Selected UART#%d is "
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"not enabled for this platform\n",
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uart_idx + 1);
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return -1;
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}
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line = 0;
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for (i = 0; i < uart_idx; i++) {
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if (uart_info->enabled_uarts & (1 << i))
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line++;
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}
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return add_preferred_console("ttyS", line, opt);
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}
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console_initcall(omap_add_serial_console);
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