diff options
Diffstat (limited to 'kernel/arch/arm/mach-ixp4xx/common.c')
| -rw-r--r-- | kernel/arch/arm/mach-ixp4xx/common.c | 672 |
1 files changed, 672 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-ixp4xx/common.c b/kernel/arch/arm/mach-ixp4xx/common.c new file mode 100644 index 000000000..8537d4c41 --- /dev/null +++ b/kernel/arch/arm/mach-ixp4xx/common.c @@ -0,0 +1,672 @@ +/* + * 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/time.h> +#include <linux/clocksource.h> +#include <linux/clockchips.h> +#include <linux/io.h> +#include <linux/export.h> +#include <linux/gpio.h> +#include <linux/cpu.h> +#include <linux/pci.h> +#include <linux/sched_clock.h> +#include <mach/udc.h> +#include <mach/hardware.h> +#include <mach/io.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> +#include <asm/page.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> + +#define IXP4XX_TIMER_FREQ 66666000 + +/* + * The timer register doesn't allow to specify the two least significant bits of + * the timeout value and assumes them being zero. So make sure IXP4XX_LATCH is + * the best value with the two least significant bits unset. + */ +#define IXP4XX_LATCH DIV_ROUND_CLOSEST(IXP4XX_TIMER_FREQ, \ + (IXP4XX_OST_RELOAD_MASK + 1) * HZ) * \ + (IXP4XX_OST_RELOAD_MASK + 1) + +static void __init ixp4xx_clocksource_init(void); +static void __init ixp4xx_clockevent_init(void); +static struct clock_event_device clockevent_ixp4xx; + +/************************************************************************* + * 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 + }, { /* Queue Manager */ + .virtual = (unsigned long)IXP4XX_QMGR_BASE_VIRT, + .pfn = __phys_to_pfn(IXP4XX_QMGR_BASE_PHYS), + .length = IXP4XX_QMGR_REGION_SIZE, + .type = MT_DEVICE + }, +}; + +void __init ixp4xx_map_io(void) +{ + iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc)); +} + +/* + * GPIO-functions + */ +/* + * The following converted to the real HW bits the gpio_line_config + */ +/* GPIO pin types */ +#define IXP4XX_GPIO_OUT 0x1 +#define IXP4XX_GPIO_IN 0x2 + +/* GPIO signal types */ +#define IXP4XX_GPIO_LOW 0 +#define IXP4XX_GPIO_HIGH 1 + +/* GPIO Clocks */ +#define IXP4XX_GPIO_CLK_0 14 +#define IXP4XX_GPIO_CLK_1 15 + +static void gpio_line_config(u8 line, u32 direction) +{ + if (direction == IXP4XX_GPIO_IN) + *IXP4XX_GPIO_GPOER |= (1 << line); + else + *IXP4XX_GPIO_GPOER &= ~(1 << line); +} + +static void gpio_line_get(u8 line, int *value) +{ + *value = (*IXP4XX_GPIO_GPINR >> line) & 0x1; +} + +static void gpio_line_set(u8 line, int value) +{ + if (value == IXP4XX_GPIO_HIGH) + *IXP4XX_GPIO_GPOUTR |= (1 << line); + else if (value == IXP4XX_GPIO_LOW) + *IXP4XX_GPIO_GPOUTR &= ~(1 << line); +} + +/************************************************************************* + * IXP4xx chipset IRQ handling + * + * TODO: GPIO IRQs should be marked invalid until the user of the IRQ + * (be it PCI or something else) configures that GPIO line + * as an IRQ. + **************************************************************************/ +enum ixp4xx_irq_type { + IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE +}; + +/* Each bit represents an IRQ: 1: edge-triggered, 0: level triggered */ +static unsigned long long ixp4xx_irq_edge = 0; + +/* + * IRQ -> GPIO mapping table + */ +static signed char irq2gpio[32] = { + -1, -1, -1, -1, -1, -1, 0, 1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, 2, 3, 4, 5, 6, + 7, 8, 9, 10, 11, 12, -1, -1, +}; + +static int ixp4xx_gpio_to_irq(struct gpio_chip *chip, unsigned gpio) +{ + int irq; + + for (irq = 0; irq < 32; irq++) { + if (irq2gpio[irq] == gpio) + return irq; + } + return -EINVAL; +} + +static int ixp4xx_set_irq_type(struct irq_data *d, unsigned int type) +{ + int line = irq2gpio[d->irq]; + u32 int_style; + enum ixp4xx_irq_type irq_type; + volatile u32 *int_reg; + + /* + * Only for GPIO IRQs + */ + if (line < 0) + return -EINVAL; + + switch (type){ + case IRQ_TYPE_EDGE_BOTH: + int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL; + irq_type = IXP4XX_IRQ_EDGE; + break; + case IRQ_TYPE_EDGE_RISING: + int_style = IXP4XX_GPIO_STYLE_RISING_EDGE; + irq_type = IXP4XX_IRQ_EDGE; + break; + case IRQ_TYPE_EDGE_FALLING: + int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE; + irq_type = IXP4XX_IRQ_EDGE; + break; + case IRQ_TYPE_LEVEL_HIGH: + int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH; + irq_type = IXP4XX_IRQ_LEVEL; + break; + case IRQ_TYPE_LEVEL_LOW: + int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW; + irq_type = IXP4XX_IRQ_LEVEL; + break; + default: + return -EINVAL; + } + + if (irq_type == IXP4XX_IRQ_EDGE) + ixp4xx_irq_edge |= (1 << d->irq); + else + ixp4xx_irq_edge &= ~(1 << d->irq); + + if (line >= 8) { /* pins 8-15 */ + line -= 8; + int_reg = IXP4XX_GPIO_GPIT2R; + } else { /* pins 0-7 */ + int_reg = IXP4XX_GPIO_GPIT1R; + } + + /* Clear the style for the appropriate pin */ + *int_reg &= ~(IXP4XX_GPIO_STYLE_CLEAR << + (line * IXP4XX_GPIO_STYLE_SIZE)); + + *IXP4XX_GPIO_GPISR = (1 << line); + + /* Set the new style */ + *int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE)); + + /* Configure the line as an input */ + gpio_line_config(irq2gpio[d->irq], IXP4XX_GPIO_IN); + + return 0; +} + +static void ixp4xx_irq_mask(struct irq_data *d) +{ + if ((cpu_is_ixp46x() || cpu_is_ixp43x()) && d->irq >= 32) + *IXP4XX_ICMR2 &= ~(1 << (d->irq - 32)); + else + *IXP4XX_ICMR &= ~(1 << d->irq); +} + +static void ixp4xx_irq_ack(struct irq_data *d) +{ + int line = (d->irq < 32) ? irq2gpio[d->irq] : -1; + + if (line >= 0) + *IXP4XX_GPIO_GPISR = (1 << line); +} + +/* + * Level triggered interrupts on GPIO lines can only be cleared when the + * interrupt condition disappears. + */ +static void ixp4xx_irq_unmask(struct irq_data *d) +{ + if (!(ixp4xx_irq_edge & (1 << d->irq))) + ixp4xx_irq_ack(d); + + if ((cpu_is_ixp46x() || cpu_is_ixp43x()) && d->irq >= 32) + *IXP4XX_ICMR2 |= (1 << (d->irq - 32)); + else + *IXP4XX_ICMR |= (1 << d->irq); +} + +static struct irq_chip ixp4xx_irq_chip = { + .name = "IXP4xx", + .irq_ack = ixp4xx_irq_ack, + .irq_mask = ixp4xx_irq_mask, + .irq_unmask = ixp4xx_irq_unmask, + .irq_set_type = ixp4xx_set_irq_type, +}; + +void __init ixp4xx_init_irq(void) +{ + int i = 0; + + /* + * ixp4xx does not implement the XScale PWRMODE register + * so it must not call cpu_do_idle(). + */ + cpu_idle_poll_ctrl(true); + + /* Route all sources to IRQ instead of FIQ */ + *IXP4XX_ICLR = 0x0; + + /* Disable all interrupt */ + *IXP4XX_ICMR = 0x0; + + if (cpu_is_ixp46x() || cpu_is_ixp43x()) { + /* Route upper 32 sources to IRQ instead of FIQ */ + *IXP4XX_ICLR2 = 0x00; + + /* Disable upper 32 interrupts */ + *IXP4XX_ICMR2 = 0x00; + } + + /* Default to all level triggered */ + for(i = 0; i < NR_IRQS; i++) { + irq_set_chip_and_handler(i, &ixp4xx_irq_chip, + handle_level_irq); + set_irq_flags(i, IRQF_VALID); + } +} + + +/************************************************************************* + * IXP4xx timer tick + * We use OS timer1 on the CPU for the timer tick and the timestamp + * counter as a source of real clock ticks to account for missed jiffies. + *************************************************************************/ + +static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + + /* Clear Pending Interrupt by writing '1' to it */ + *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND; + + evt->event_handler(evt); + + return IRQ_HANDLED; +} + +static struct irqaction ixp4xx_timer_irq = { + .name = "timer1", + .flags = IRQF_TIMER | IRQF_IRQPOLL, + .handler = ixp4xx_timer_interrupt, + .dev_id = &clockevent_ixp4xx, +}; + +void __init ixp4xx_timer_init(void) +{ + /* Reset/disable counter */ + *IXP4XX_OSRT1 = 0; + + /* Clear Pending Interrupt by writing '1' to it */ + *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND; + + /* Reset time-stamp counter */ + *IXP4XX_OSTS = 0; + + /* Connect the interrupt handler and enable the interrupt */ + setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq); + + ixp4xx_clocksource_init(); + ixp4xx_clockevent_init(); +} + +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, + }, +}; + +/* + * 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 platform_device *ixp4xx_devices[] __initdata = { + &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); + +static int ixp4xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + gpio_line_config(gpio, IXP4XX_GPIO_IN); + + return 0; +} + +static int ixp4xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, + int level) +{ + gpio_line_set(gpio, level); + gpio_line_config(gpio, IXP4XX_GPIO_OUT); + + return 0; +} + +static int ixp4xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +{ + int value; + + gpio_line_get(gpio, &value); + + return value; +} + +static void ixp4xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, + int value) +{ + gpio_line_set(gpio, value); +} + +static struct gpio_chip ixp4xx_gpio_chip = { + .label = "IXP4XX_GPIO_CHIP", + .direction_input = ixp4xx_gpio_direction_input, + .direction_output = ixp4xx_gpio_direction_output, + .get = ixp4xx_gpio_get_value, + .set = ixp4xx_gpio_set_value, + .to_irq = ixp4xx_gpio_to_irq, + .base = 0, + .ngpio = 16, +}; + +void __init ixp4xx_sys_init(void) +{ + ixp4xx_exp_bus_size = SZ_16M; + + platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices)); + + gpiochip_add(&ixp4xx_gpio_chip); + + 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); +} + +/* + * sched_clock() + */ +static u64 notrace ixp4xx_read_sched_clock(void) +{ + return *IXP4XX_OSTS; +} + +/* + * clocksource + */ + +static cycle_t ixp4xx_clocksource_read(struct clocksource *c) +{ + return *IXP4XX_OSTS; +} + +unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ; +EXPORT_SYMBOL(ixp4xx_timer_freq); +static void __init ixp4xx_clocksource_init(void) +{ + sched_clock_register(ixp4xx_read_sched_clock, 32, ixp4xx_timer_freq); + + clocksource_mmio_init(NULL, "OSTS", ixp4xx_timer_freq, 200, 32, + ixp4xx_clocksource_read); +} + +/* + * clockevents + */ +static int ixp4xx_set_next_event(unsigned long evt, + struct clock_event_device *unused) +{ + unsigned long opts = *IXP4XX_OSRT1 & IXP4XX_OST_RELOAD_MASK; + + *IXP4XX_OSRT1 = (evt & ~IXP4XX_OST_RELOAD_MASK) | opts; + + return 0; +} + +static void ixp4xx_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + unsigned long opts = *IXP4XX_OSRT1 & IXP4XX_OST_RELOAD_MASK; + unsigned long osrt = *IXP4XX_OSRT1 & ~IXP4XX_OST_RELOAD_MASK; + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + osrt = IXP4XX_LATCH & ~IXP4XX_OST_RELOAD_MASK; + opts = IXP4XX_OST_ENABLE; + break; + case CLOCK_EVT_MODE_ONESHOT: + /* period set by 'set next_event' */ + osrt = 0; + opts = IXP4XX_OST_ENABLE | IXP4XX_OST_ONE_SHOT; + break; + case CLOCK_EVT_MODE_SHUTDOWN: + opts &= ~IXP4XX_OST_ENABLE; + break; + case CLOCK_EVT_MODE_RESUME: + opts |= IXP4XX_OST_ENABLE; + break; + case CLOCK_EVT_MODE_UNUSED: + default: + osrt = opts = 0; + break; + } + + *IXP4XX_OSRT1 = osrt | opts; +} + +static struct clock_event_device clockevent_ixp4xx = { + .name = "ixp4xx timer1", + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, + .rating = 200, + .set_mode = ixp4xx_set_mode, + .set_next_event = ixp4xx_set_next_event, +}; + +static void __init ixp4xx_clockevent_init(void) +{ + clockevent_ixp4xx.cpumask = cpumask_of(0); + clockevents_config_and_register(&clockevent_ixp4xx, IXP4XX_TIMER_FREQ, + 0xf, 0xfffffffe); +} + +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 +} |