mirror of https://gitee.com/openkylin/linux.git
365 lines
8.5 KiB
C
365 lines
8.5 KiB
C
/*
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* arch/arm/mach-ixp4xx/common.c
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*
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* Generic code shared across all IXP4XX platforms
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*
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* Maintainer: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2002 (c) Intel Corporation
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* Copyright 2003-2004 (c) MontaVista, Software, Inc.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/serial.h>
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#include <linux/tty.h>
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#include <linux/platform_device.h>
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#include <linux/serial_core.h>
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#include <linux/interrupt.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/cpu.h>
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#include <linux/pci.h>
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#include <linux/sched_clock.h>
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#include <linux/irqchip/irq-ixp4xx.h>
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#include <linux/platform_data/timer-ixp4xx.h>
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#include <mach/udc.h>
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#include <mach/hardware.h>
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#include <mach/io.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/exception.h>
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#include <asm/irq.h>
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#include <asm/system_misc.h>
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#include <asm/mach/map.h>
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#include <asm/mach/irq.h>
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#include <asm/mach/time.h>
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#include "irqs.h"
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#define IXP4XX_TIMER_FREQ 66666000
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/*************************************************************************
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* IXP4xx chipset I/O mapping
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*************************************************************************/
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static struct map_desc ixp4xx_io_desc[] __initdata = {
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{ /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
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.virtual = (unsigned long)IXP4XX_PERIPHERAL_BASE_VIRT,
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.pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
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.length = IXP4XX_PERIPHERAL_REGION_SIZE,
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.type = MT_DEVICE
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}, { /* Expansion Bus Config Registers */
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.virtual = (unsigned long)IXP4XX_EXP_CFG_BASE_VIRT,
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.pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
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.length = IXP4XX_EXP_CFG_REGION_SIZE,
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.type = MT_DEVICE
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}, { /* PCI Registers */
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.virtual = (unsigned long)IXP4XX_PCI_CFG_BASE_VIRT,
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.pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
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.length = IXP4XX_PCI_CFG_REGION_SIZE,
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.type = MT_DEVICE
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},
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};
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void __init ixp4xx_map_io(void)
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{
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iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
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}
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void __init ixp4xx_init_irq(void)
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{
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/*
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* ixp4xx does not implement the XScale PWRMODE register
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* so it must not call cpu_do_idle().
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*/
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cpu_idle_poll_ctrl(true);
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ixp4xx_irq_init(IXP4XX_INTC_BASE_PHYS,
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(cpu_is_ixp46x() || cpu_is_ixp43x()));
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}
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void __init ixp4xx_timer_init(void)
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{
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return ixp4xx_timer_setup(IXP4XX_TIMER_BASE_PHYS,
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IRQ_IXP4XX_TIMER1,
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IXP4XX_TIMER_FREQ);
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}
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static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
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void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
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{
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memcpy(&ixp4xx_udc_info, info, sizeof *info);
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}
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static struct resource ixp4xx_udc_resources[] = {
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[0] = {
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.start = 0xc800b000,
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.end = 0xc800bfff,
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.start = IRQ_IXP4XX_USB,
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.end = IRQ_IXP4XX_USB,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct resource ixp4xx_gpio_resource[] = {
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{
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.start = IXP4XX_GPIO_BASE_PHYS,
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.end = IXP4XX_GPIO_BASE_PHYS + 0xfff,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device ixp4xx_gpio_device = {
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.name = "ixp4xx-gpio",
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.id = -1,
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.dev = {
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.coherent_dma_mask = DMA_BIT_MASK(32),
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},
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.resource = ixp4xx_gpio_resource,
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.num_resources = ARRAY_SIZE(ixp4xx_gpio_resource),
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};
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/*
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* USB device controller. The IXP4xx uses the same controller as PXA25X,
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* so we just use the same device.
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*/
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static struct platform_device ixp4xx_udc_device = {
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.name = "pxa25x-udc",
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.id = -1,
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.num_resources = 2,
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.resource = ixp4xx_udc_resources,
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.dev = {
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.platform_data = &ixp4xx_udc_info,
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},
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};
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static struct resource ixp4xx_npe_resources[] = {
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{
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.start = IXP4XX_NPEA_BASE_PHYS,
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.end = IXP4XX_NPEA_BASE_PHYS + 0xfff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IXP4XX_NPEB_BASE_PHYS,
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.end = IXP4XX_NPEB_BASE_PHYS + 0xfff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IXP4XX_NPEC_BASE_PHYS,
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.end = IXP4XX_NPEC_BASE_PHYS + 0xfff,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device ixp4xx_npe_device = {
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.name = "ixp4xx-npe",
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.id = -1,
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.num_resources = ARRAY_SIZE(ixp4xx_npe_resources),
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.resource = ixp4xx_npe_resources,
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};
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static struct resource ixp4xx_qmgr_resources[] = {
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{
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.start = IXP4XX_QMGR_BASE_PHYS,
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.end = IXP4XX_QMGR_BASE_PHYS + 0x3fff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IRQ_IXP4XX_QM1,
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.end = IRQ_IXP4XX_QM1,
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.flags = IORESOURCE_IRQ,
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},
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{
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.start = IRQ_IXP4XX_QM2,
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.end = IRQ_IXP4XX_QM2,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct platform_device ixp4xx_qmgr_device = {
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.name = "ixp4xx-qmgr",
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.id = -1,
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.num_resources = ARRAY_SIZE(ixp4xx_qmgr_resources),
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.resource = ixp4xx_qmgr_resources,
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};
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static struct platform_device *ixp4xx_devices[] __initdata = {
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&ixp4xx_npe_device,
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&ixp4xx_qmgr_device,
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&ixp4xx_gpio_device,
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&ixp4xx_udc_device,
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};
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static struct resource ixp46x_i2c_resources[] = {
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[0] = {
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.start = 0xc8011000,
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.end = 0xc801101c,
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.start = IRQ_IXP4XX_I2C,
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.end = IRQ_IXP4XX_I2C,
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.flags = IORESOURCE_IRQ
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}
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};
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/*
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* I2C controller. The IXP46x uses the same block as the IOP3xx, so
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* we just use the same device name.
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*/
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static struct platform_device ixp46x_i2c_controller = {
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.name = "IOP3xx-I2C",
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.id = 0,
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.num_resources = 2,
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.resource = ixp46x_i2c_resources
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};
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static struct platform_device *ixp46x_devices[] __initdata = {
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&ixp46x_i2c_controller
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};
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unsigned long ixp4xx_exp_bus_size;
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EXPORT_SYMBOL(ixp4xx_exp_bus_size);
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void __init ixp4xx_sys_init(void)
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{
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ixp4xx_exp_bus_size = SZ_16M;
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platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
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if (cpu_is_ixp46x()) {
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int region;
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platform_add_devices(ixp46x_devices,
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ARRAY_SIZE(ixp46x_devices));
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for (region = 0; region < 7; region++) {
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if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
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ixp4xx_exp_bus_size = SZ_32M;
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break;
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}
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}
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}
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printk("IXP4xx: Using %luMiB expansion bus window size\n",
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ixp4xx_exp_bus_size >> 20);
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}
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unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
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EXPORT_SYMBOL(ixp4xx_timer_freq);
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void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
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{
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if (mode == REBOOT_SOFT) {
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/* Jump into ROM at address 0 */
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soft_restart(0);
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} else {
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/* Use on-chip reset capability */
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/* set the "key" register to enable access to
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* "timer" and "enable" registers
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*/
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*IXP4XX_OSWK = IXP4XX_WDT_KEY;
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/* write 0 to the timer register for an immediate reset */
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*IXP4XX_OSWT = 0;
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*IXP4XX_OSWE = IXP4XX_WDT_RESET_ENABLE | IXP4XX_WDT_COUNT_ENABLE;
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}
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}
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#ifdef CONFIG_PCI
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static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
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{
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return (dma_addr + size) > SZ_64M;
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}
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static int ixp4xx_platform_notify_remove(struct device *dev)
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{
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if (dev_is_pci(dev))
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dmabounce_unregister_dev(dev);
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return 0;
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}
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#endif
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/*
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* Setup DMA mask to 64MB on PCI devices and 4 GB on all other things.
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*/
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static int ixp4xx_platform_notify(struct device *dev)
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{
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dev->dma_mask = &dev->coherent_dma_mask;
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#ifdef CONFIG_PCI
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if (dev_is_pci(dev)) {
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dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */
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dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
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return 0;
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}
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#endif
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dev->coherent_dma_mask = DMA_BIT_MASK(32);
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return 0;
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}
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int dma_set_coherent_mask(struct device *dev, u64 mask)
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{
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if (dev_is_pci(dev))
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mask &= DMA_BIT_MASK(28); /* 64 MB */
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if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) {
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dev->coherent_dma_mask = mask;
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return 0;
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}
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return -EIO; /* device wanted sub-64MB mask */
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}
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EXPORT_SYMBOL(dma_set_coherent_mask);
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#ifdef CONFIG_IXP4XX_INDIRECT_PCI
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/*
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* In the case of using indirect PCI, we simply return the actual PCI
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* address and our read/write implementation use that to drive the
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* access registers. If something outside of PCI is ioremap'd, we
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* fallback to the default.
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*/
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static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size,
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unsigned int mtype, void *caller)
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{
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if (!is_pci_memory(addr))
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return __arm_ioremap_caller(addr, size, mtype, caller);
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return (void __iomem *)addr;
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}
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static void ixp4xx_iounmap(volatile void __iomem *addr)
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{
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if (!is_pci_memory((__force u32)addr))
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__iounmap(addr);
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}
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#endif
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void __init ixp4xx_init_early(void)
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{
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platform_notify = ixp4xx_platform_notify;
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#ifdef CONFIG_PCI
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platform_notify_remove = ixp4xx_platform_notify_remove;
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#endif
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#ifdef CONFIG_IXP4XX_INDIRECT_PCI
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arch_ioremap_caller = ixp4xx_ioremap_caller;
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arch_iounmap = ixp4xx_iounmap;
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#endif
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}
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