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-rw-r--r--kernel/arch/arm/mach-ixp4xx/common.c672
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
+}