459 lines
11 KiB
C
459 lines
11 KiB
C
/*
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* linux/arch/arm/mach-sa1100/assabet.c
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*
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* Author: Nicolas Pitre
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*
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* This file contains all Assabet-specific tweaks.
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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/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/serial_core.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <asm/irq.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/flash.h>
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#include <asm/mach/irda.h>
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#include <asm/mach/map.h>
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#include <asm/mach/serial_sa1100.h>
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#include <mach/assabet.h>
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#include <mach/mcp.h>
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#include "generic.h"
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#define ASSABET_BCR_DB1110 \
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(ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \
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ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \
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ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \
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ASSABET_BCR_IRDA_MD0)
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#define ASSABET_BCR_DB1111 \
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(ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \
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ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \
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ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \
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ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
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ASSABET_BCR_IRDA_MD0 | ASSABET_BCR_CF_RST)
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unsigned long SCR_value = ASSABET_SCR_INIT;
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EXPORT_SYMBOL(SCR_value);
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static unsigned long BCR_value = ASSABET_BCR_DB1110;
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void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
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{
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unsigned long flags;
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local_irq_save(flags);
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BCR_value = (BCR_value & ~mask) | val;
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ASSABET_BCR = BCR_value;
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(ASSABET_BCR_frob);
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static void assabet_backlight_power(int on)
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{
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#ifndef ASSABET_PAL_VIDEO
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if (on)
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ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
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else
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#endif
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ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
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}
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/*
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* Turn on/off the backlight. When turning the backlight on,
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* we wait 500us after turning it on so we don't cause the
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* supplies to droop when we enable the LCD controller (and
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* cause a hard reset.)
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*/
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static void assabet_lcd_power(int on)
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{
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#ifndef ASSABET_PAL_VIDEO
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if (on) {
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ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
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udelay(500);
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} else
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#endif
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ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
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}
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/*
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* Assabet flash support code.
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*/
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#ifdef ASSABET_REV_4
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/*
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* Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
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*/
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static struct mtd_partition assabet_partitions[] = {
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{
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.name = "bootloader",
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.size = 0x00020000,
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.offset = 0,
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.mask_flags = MTD_WRITEABLE,
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}, {
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.name = "bootloader params",
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.size = 0x00020000,
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.offset = MTDPART_OFS_APPEND,
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.mask_flags = MTD_WRITEABLE,
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}, {
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.name = "jffs",
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.size = MTDPART_SIZ_FULL,
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#else
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/*
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* Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
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*/
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static struct mtd_partition assabet_partitions[] = {
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{
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.name = "bootloader",
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.size = 0x00040000,
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.offset = 0,
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.mask_flags = MTD_WRITEABLE,
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}, {
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.name = "bootloader params",
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.size = 0x00040000,
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.offset = MTDPART_OFS_APPEND,
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.mask_flags = MTD_WRITEABLE,
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}, {
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.name = "jffs",
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.size = MTDPART_SIZ_FULL,
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#endif
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static struct flash_platform_data assabet_flash_data = {
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.map_name = "cfi_probe",
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.parts = assabet_partitions,
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.nr_parts = ARRAY_SIZE(assabet_partitions),
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};
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static struct resource assabet_flash_resources[] = {
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{
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.start = SA1100_CS0_PHYS,
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.end = SA1100_CS0_PHYS + SZ_32M - 1,
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.flags = IORESOURCE_MEM,
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}, {
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.start = SA1100_CS1_PHYS,
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.end = SA1100_CS1_PHYS + SZ_32M - 1,
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.flags = IORESOURCE_MEM,
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}
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};
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/*
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* Assabet IrDA support code.
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*/
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static int assabet_irda_set_power(struct device *dev, unsigned int state)
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{
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static unsigned int bcr_state[4] = {
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ASSABET_BCR_IRDA_MD0,
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ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
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ASSABET_BCR_IRDA_MD1,
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0
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};
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if (state < 4) {
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state = bcr_state[state];
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ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
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ASSABET_BCR_IRDA_MD0));
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ASSABET_BCR_set(state);
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}
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return 0;
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}
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static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
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{
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if (speed < 4000000)
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ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
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else
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ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
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}
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static struct irda_platform_data assabet_irda_data = {
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.set_power = assabet_irda_set_power,
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.set_speed = assabet_irda_set_speed,
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};
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static struct mcp_plat_data assabet_mcp_data = {
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.mccr0 = MCCR0_ADM,
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.sclk_rate = 11981000,
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};
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static void __init assabet_init(void)
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{
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/*
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* Ensure that the power supply is in "high power" mode.
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*/
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GPDR |= GPIO_GPIO16;
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GPSR = GPIO_GPIO16;
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/*
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* Ensure that these pins are set as outputs and are driving
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* logic 0. This ensures that we won't inadvertently toggle
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* the WS latch in the CPLD, and we don't float causing
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* excessive power drain. --rmk
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*/
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GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
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GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
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/*
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* Set up registers for sleep mode.
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*/
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PWER = PWER_GPIO0;
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PGSR = 0;
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PCFR = 0;
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PSDR = 0;
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PPDR |= PPC_TXD3 | PPC_TXD1;
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PPSR |= PPC_TXD3 | PPC_TXD1;
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sa1100fb_lcd_power = assabet_lcd_power;
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sa1100fb_backlight_power = assabet_backlight_power;
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if (machine_has_neponset()) {
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/*
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* Angel sets this, but other bootloaders may not.
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*
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* This must precede any driver calls to BCR_set()
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* or BCR_clear().
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*/
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ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
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#ifndef CONFIG_ASSABET_NEPONSET
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printk( "Warning: Neponset detected but full support "
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"hasn't been configured in the kernel\n" );
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#endif
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}
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sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
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ARRAY_SIZE(assabet_flash_resources));
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sa11x0_register_irda(&assabet_irda_data);
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sa11x0_register_mcp(&assabet_mcp_data);
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}
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/*
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* On Assabet, we must probe for the Neponset board _before_
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* paging_init() has occurred to actually determine the amount
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* of RAM available. To do so, we map the appropriate IO section
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* in the page table here in order to access GPIO registers.
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*/
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static void __init map_sa1100_gpio_regs( void )
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{
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unsigned long phys = __PREG(GPLR) & PMD_MASK;
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unsigned long virt = io_p2v(phys);
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int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
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pmd_t *pmd;
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pmd = pmd_offset(pgd_offset_k(virt), virt);
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*pmd = __pmd(phys | prot);
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flush_pmd_entry(pmd);
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}
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/*
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* Read System Configuration "Register"
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* (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
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* User's Guide", section 4.4.1)
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*
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* This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
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* to set up the serial port for decompression status messages. We
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* repeat it here because the kernel may not be loaded as a zImage, and
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* also because it's a hassle to communicate the SCR value to the kernel
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* from the decompressor.
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*
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* Note that IRQs are guaranteed to be disabled.
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*/
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static void __init get_assabet_scr(void)
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{
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unsigned long scr, i;
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GPDR |= 0x3fc; /* Configure GPIO 9:2 as outputs */
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GPSR = 0x3fc; /* Write 0xFF to GPIO 9:2 */
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GPDR &= ~(0x3fc); /* Configure GPIO 9:2 as inputs */
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for(i = 100; i--; ) /* Read GPIO 9:2 */
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scr = GPLR;
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GPDR |= 0x3fc; /* restore correct pin direction */
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scr &= 0x3fc; /* save as system configuration byte. */
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SCR_value = scr;
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}
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static void __init
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fixup_assabet(struct machine_desc *desc, struct tag *tags,
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char **cmdline, struct meminfo *mi)
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{
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/* This must be done before any call to machine_has_neponset() */
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map_sa1100_gpio_regs();
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get_assabet_scr();
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if (machine_has_neponset())
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printk("Neponset expansion board detected\n");
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}
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static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
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{
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if (port->mapbase == _Ser1UTCR0) {
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if (state)
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ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
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ASSABET_BCR_COM_RTS |
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ASSABET_BCR_COM_DTR);
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else
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ASSABET_BCR_set(ASSABET_BCR_RS232EN |
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ASSABET_BCR_COM_RTS |
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ASSABET_BCR_COM_DTR);
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}
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}
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/*
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* Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
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* and UART3 (radio module). We only handle them for UART1 here.
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*/
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static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
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{
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if (port->mapbase == _Ser1UTCR0) {
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u_int set = 0, clear = 0;
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if (mctrl & TIOCM_RTS)
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clear |= ASSABET_BCR_COM_RTS;
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else
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set |= ASSABET_BCR_COM_RTS;
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if (mctrl & TIOCM_DTR)
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clear |= ASSABET_BCR_COM_DTR;
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else
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set |= ASSABET_BCR_COM_DTR;
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ASSABET_BCR_clear(clear);
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ASSABET_BCR_set(set);
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}
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}
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static u_int assabet_get_mctrl(struct uart_port *port)
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{
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u_int ret = 0;
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u_int bsr = ASSABET_BSR;
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/* need 2 reads to read current value */
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bsr = ASSABET_BSR;
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if (port->mapbase == _Ser1UTCR0) {
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if (bsr & ASSABET_BSR_COM_DCD)
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ret |= TIOCM_CD;
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if (bsr & ASSABET_BSR_COM_CTS)
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ret |= TIOCM_CTS;
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if (bsr & ASSABET_BSR_COM_DSR)
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ret |= TIOCM_DSR;
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} else if (port->mapbase == _Ser3UTCR0) {
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if (bsr & ASSABET_BSR_RAD_DCD)
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ret |= TIOCM_CD;
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if (bsr & ASSABET_BSR_RAD_CTS)
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ret |= TIOCM_CTS;
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if (bsr & ASSABET_BSR_RAD_DSR)
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ret |= TIOCM_DSR;
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if (bsr & ASSABET_BSR_RAD_RI)
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ret |= TIOCM_RI;
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} else {
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ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
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}
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return ret;
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}
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static struct sa1100_port_fns assabet_port_fns __initdata = {
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.set_mctrl = assabet_set_mctrl,
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.get_mctrl = assabet_get_mctrl,
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.pm = assabet_uart_pm,
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};
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static struct map_desc assabet_io_desc[] __initdata = {
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{ /* Board Control Register */
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.virtual = 0xf1000000,
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.pfn = __phys_to_pfn(0x12000000),
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.length = 0x00100000,
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.type = MT_DEVICE
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}, { /* MQ200 */
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.virtual = 0xf2800000,
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.pfn = __phys_to_pfn(0x4b800000),
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.length = 0x00800000,
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.type = MT_DEVICE
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}
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};
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static void __init assabet_map_io(void)
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{
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sa1100_map_io();
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iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
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/*
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* Set SUS bit in SDCR0 so serial port 1 functions.
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* Its called GPCLKR0 in my SA1110 manual.
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*/
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Ser1SDCR0 |= SDCR0_SUS;
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if (machine_has_neponset()) {
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#ifdef CONFIG_ASSABET_NEPONSET
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extern void neponset_map_io(void);
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/*
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* We map Neponset registers even if it isn't present since
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* many drivers will try to probe their stuff (and fail).
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* This is still more friendly than a kernel paging request
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* crash.
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*/
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neponset_map_io();
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#endif
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} else {
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sa1100_register_uart_fns(&assabet_port_fns);
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}
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/*
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* When Neponset is attached, the first UART should be
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* UART3. That's what Angel is doing and many documents
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* are stating this.
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*
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* We do the Neponset mapping even if Neponset support
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* isn't compiled in so the user will still get something on
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* the expected physical serial port.
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*
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* We no longer do this; not all boot loaders support it,
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* and UART3 appears to be somewhat unreliable with blob.
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*/
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sa1100_register_uart(0, 1);
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sa1100_register_uart(2, 3);
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}
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MACHINE_START(ASSABET, "Intel-Assabet")
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.phys_io = 0x80000000,
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.io_pg_offst = ((0xf8000000) >> 18) & 0xfffc,
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.boot_params = 0xc0000100,
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.fixup = fixup_assabet,
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.map_io = assabet_map_io,
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.init_irq = sa1100_init_irq,
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.timer = &sa1100_timer,
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.init_machine = assabet_init,
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MACHINE_END
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