diff options
Diffstat (limited to 'arch/arm/mach-ixp4xx/common.c')
| -rw-r--r-- | arch/arm/mach-ixp4xx/common.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c new file mode 100644 index 000000000..000f672a9 --- /dev/null +++ b/arch/arm/mach-ixp4xx/common.c @@ -0,0 +1,365 @@ +/* + * arch/arm/mach-ixp4xx/common.c + * + * Generic code shared across all IXP4XX platforms + * + * Maintainer: Deepak Saxena <dsaxena@plexity.net> + * + * Copyright 2002 (c) Intel Corporation + * Copyright 2003-2004 (c) MontaVista, Software, Inc. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/serial.h> +#include <linux/tty.h> +#include <linux/platform_device.h> +#include <linux/serial_core.h> +#include <linux/interrupt.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/export.h> +#include <linux/cpu.h> +#include <linux/pci.h> +#include <linux/sched_clock.h> +#include <linux/irqchip/irq-ixp4xx.h> +#include <linux/platform_data/timer-ixp4xx.h> +#include <linux/dma-map-ops.h> +#include <mach/udc.h> +#include <mach/hardware.h> +#include <mach/io.h> +#include <linux/uaccess.h> +#include <asm/page.h> +#include <asm/exception.h> +#include <asm/irq.h> +#include <asm/system_misc.h> +#include <asm/mach/map.h> +#include <asm/mach/irq.h> +#include <asm/mach/time.h> + +#include "irqs.h" + +#define IXP4XX_TIMER_FREQ 66666000 + +/************************************************************************* + * IXP4xx chipset I/O mapping + *************************************************************************/ +static struct map_desc ixp4xx_io_desc[] __initdata = { + { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */ + .virtual = (unsigned long)IXP4XX_PERIPHERAL_BASE_VIRT, + .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS), + .length = IXP4XX_PERIPHERAL_REGION_SIZE, + .type = MT_DEVICE + }, { /* Expansion Bus Config Registers */ + .virtual = (unsigned long)IXP4XX_EXP_CFG_BASE_VIRT, + .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS), + .length = IXP4XX_EXP_CFG_REGION_SIZE, + .type = MT_DEVICE + }, { /* PCI Registers */ + .virtual = (unsigned long)IXP4XX_PCI_CFG_BASE_VIRT, + .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS), + .length = IXP4XX_PCI_CFG_REGION_SIZE, + .type = MT_DEVICE + }, +}; + +void __init ixp4xx_map_io(void) +{ + iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc)); +} + +void __init ixp4xx_init_irq(void) +{ + /* + * ixp4xx does not implement the XScale PWRMODE register + * so it must not call cpu_do_idle(). + */ + cpu_idle_poll_ctrl(true); + + ixp4xx_irq_init(IXP4XX_INTC_BASE_PHYS, + (cpu_is_ixp46x() || cpu_is_ixp43x())); +} + +void __init ixp4xx_timer_init(void) +{ + return ixp4xx_timer_setup(IXP4XX_TIMER_BASE_PHYS, + IRQ_IXP4XX_TIMER1, + IXP4XX_TIMER_FREQ); +} + +static struct pxa2xx_udc_mach_info ixp4xx_udc_info; + +void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info) +{ + memcpy(&ixp4xx_udc_info, info, sizeof *info); +} + +static struct resource ixp4xx_udc_resources[] = { + [0] = { + .start = 0xc800b000, + .end = 0xc800bfff, + .flags = IORESOURCE_MEM, + }, + [1] = { + .start = IRQ_IXP4XX_USB, + .end = IRQ_IXP4XX_USB, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct resource ixp4xx_gpio_resource[] = { + { + .start = IXP4XX_GPIO_BASE_PHYS, + .end = IXP4XX_GPIO_BASE_PHYS + 0xfff, + .flags = IORESOURCE_MEM, + }, +}; + +static struct platform_device ixp4xx_gpio_device = { + .name = "ixp4xx-gpio", + .id = -1, + .dev = { + .coherent_dma_mask = DMA_BIT_MASK(32), + }, + .resource = ixp4xx_gpio_resource, + .num_resources = ARRAY_SIZE(ixp4xx_gpio_resource), +}; + +/* + * USB device controller. The IXP4xx uses the same controller as PXA25X, + * so we just use the same device. + */ +static struct platform_device ixp4xx_udc_device = { + .name = "pxa25x-udc", + .id = -1, + .num_resources = 2, + .resource = ixp4xx_udc_resources, + .dev = { + .platform_data = &ixp4xx_udc_info, + }, +}; + +static struct resource ixp4xx_npe_resources[] = { + { + .start = IXP4XX_NPEA_BASE_PHYS, + .end = IXP4XX_NPEA_BASE_PHYS + 0xfff, + .flags = IORESOURCE_MEM, + }, + { + .start = IXP4XX_NPEB_BASE_PHYS, + .end = IXP4XX_NPEB_BASE_PHYS + 0xfff, + .flags = IORESOURCE_MEM, + }, + { + .start = IXP4XX_NPEC_BASE_PHYS, + .end = IXP4XX_NPEC_BASE_PHYS + 0xfff, + .flags = IORESOURCE_MEM, + }, + +}; + +static struct platform_device ixp4xx_npe_device = { + .name = "ixp4xx-npe", + .id = -1, + .num_resources = ARRAY_SIZE(ixp4xx_npe_resources), + .resource = ixp4xx_npe_resources, +}; + +static struct resource ixp4xx_qmgr_resources[] = { + { + .start = IXP4XX_QMGR_BASE_PHYS, + .end = IXP4XX_QMGR_BASE_PHYS + 0x3fff, + .flags = IORESOURCE_MEM, + }, + { + .start = IRQ_IXP4XX_QM1, + .end = IRQ_IXP4XX_QM1, + .flags = IORESOURCE_IRQ, + }, + { + .start = IRQ_IXP4XX_QM2, + .end = IRQ_IXP4XX_QM2, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device ixp4xx_qmgr_device = { + .name = "ixp4xx-qmgr", + .id = -1, + .num_resources = ARRAY_SIZE(ixp4xx_qmgr_resources), + .resource = ixp4xx_qmgr_resources, +}; + +static struct platform_device *ixp4xx_devices[] __initdata = { + &ixp4xx_npe_device, + &ixp4xx_qmgr_device, + &ixp4xx_gpio_device, + &ixp4xx_udc_device, +}; + +static struct resource ixp46x_i2c_resources[] = { + [0] = { + .start = 0xc8011000, + .end = 0xc801101c, + .flags = IORESOURCE_MEM, + }, + [1] = { + .start = IRQ_IXP4XX_I2C, + .end = IRQ_IXP4XX_I2C, + .flags = IORESOURCE_IRQ + } +}; + +/* + * I2C controller. The IXP46x uses the same block as the IOP3xx, so + * we just use the same device name. + */ +static struct platform_device ixp46x_i2c_controller = { + .name = "IOP3xx-I2C", + .id = 0, + .num_resources = 2, + .resource = ixp46x_i2c_resources +}; + +static struct platform_device *ixp46x_devices[] __initdata = { + &ixp46x_i2c_controller +}; + +unsigned long ixp4xx_exp_bus_size; +EXPORT_SYMBOL(ixp4xx_exp_bus_size); + +void __init ixp4xx_sys_init(void) +{ + ixp4xx_exp_bus_size = SZ_16M; + + platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices)); + + if (cpu_is_ixp46x()) { + int region; + + platform_add_devices(ixp46x_devices, + ARRAY_SIZE(ixp46x_devices)); + + for (region = 0; region < 7; region++) { + if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) { + ixp4xx_exp_bus_size = SZ_32M; + break; + } + } + } + + printk("IXP4xx: Using %luMiB expansion bus window size\n", + ixp4xx_exp_bus_size >> 20); +} + +unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ; +EXPORT_SYMBOL(ixp4xx_timer_freq); + +void ixp4xx_restart(enum reboot_mode mode, const char *cmd) +{ + if (mode == REBOOT_SOFT) { + /* Jump into ROM at address 0 */ + soft_restart(0); + } else { + /* Use on-chip reset capability */ + + /* set the "key" register to enable access to + * "timer" and "enable" registers + */ + *IXP4XX_OSWK = IXP4XX_WDT_KEY; + + /* write 0 to the timer register for an immediate reset */ + *IXP4XX_OSWT = 0; + + *IXP4XX_OSWE = IXP4XX_WDT_RESET_ENABLE | IXP4XX_WDT_COUNT_ENABLE; + } +} + +#ifdef CONFIG_PCI +static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size) +{ + return (dma_addr + size) > SZ_64M; +} + +static int ixp4xx_platform_notify_remove(struct device *dev) +{ + if (dev_is_pci(dev)) + dmabounce_unregister_dev(dev); + + return 0; +} +#endif + +/* + * Setup DMA mask to 64MB on PCI devices and 4 GB on all other things. + */ +static int ixp4xx_platform_notify(struct device *dev) +{ + dev->dma_mask = &dev->coherent_dma_mask; + +#ifdef CONFIG_PCI + if (dev_is_pci(dev)) { + dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */ + dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce); + return 0; + } +#endif + + dev->coherent_dma_mask = DMA_BIT_MASK(32); + return 0; +} + +int dma_set_coherent_mask(struct device *dev, u64 mask) +{ + if (dev_is_pci(dev)) + mask &= DMA_BIT_MASK(28); /* 64 MB */ + + if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) { + dev->coherent_dma_mask = mask; + return 0; + } + + return -EIO; /* device wanted sub-64MB mask */ +} +EXPORT_SYMBOL(dma_set_coherent_mask); + +#ifdef CONFIG_IXP4XX_INDIRECT_PCI +/* + * In the case of using indirect PCI, we simply return the actual PCI + * address and our read/write implementation use that to drive the + * access registers. If something outside of PCI is ioremap'd, we + * fallback to the default. + */ + +static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size, + unsigned int mtype, void *caller) +{ + if (!is_pci_memory(addr)) + return __arm_ioremap_caller(addr, size, mtype, caller); + + return (void __iomem *)addr; +} + +static void ixp4xx_iounmap(volatile void __iomem *addr) +{ + if (!is_pci_memory((__force u32)addr)) + __iounmap(addr); +} +#endif + +void __init ixp4xx_init_early(void) +{ + platform_notify = ixp4xx_platform_notify; +#ifdef CONFIG_PCI + platform_notify_remove = ixp4xx_platform_notify_remove; +#endif +#ifdef CONFIG_IXP4XX_INDIRECT_PCI + arch_ioremap_caller = ixp4xx_ioremap_caller; + arch_iounmap = ixp4xx_iounmap; +#endif +} |