#include <linux/serial.h>
#include <linux/sched.h>
#include <linux/tty.h>
+#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/bootmem.h>
#include <linux/interrupt.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
-
-/*************************************************************************
- * GPIO acces functions
- *************************************************************************/
-
-/*
- * Configure GPIO line for input, interrupt, or output operation
- *
- * TODO: Enable/disable the irq_desc based on interrupt or output mode.
- * TODO: Should these be named ixp4xx_gpio_?
- */
-void gpio_line_config(u8 line, u32 style)
-{
- u32 enable;
- volatile u32 *int_reg;
- u32 int_style;
-
- enable = *IXP4XX_GPIO_GPOER;
-
- if (style & IXP4XX_GPIO_OUT) {
- enable &= ~((1) << line);
- } else if (style & IXP4XX_GPIO_IN) {
- enable |= ((1) << line);
-
- switch (style & IXP4XX_GPIO_INTSTYLE_MASK)
- {
- case (IXP4XX_GPIO_ACTIVE_HIGH):
- int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
- break;
- case (IXP4XX_GPIO_ACTIVE_LOW):
- int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
- break;
- case (IXP4XX_GPIO_RISING_EDGE):
- int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
- break;
- case (IXP4XX_GPIO_FALLING_EDGE):
- int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
- break;
- case (IXP4XX_GPIO_TRANSITIONAL):
- int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
- break;
- default:
- int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
- break;
- }
-
- 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));
-
- /* Set the new style */
- *int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
- }
-
- *IXP4XX_GPIO_GPOER = enable;
-}
-
-EXPORT_SYMBOL(gpio_line_config);
-
/*************************************************************************
* IXP4xx chipset I/O mapping
*************************************************************************/
static struct map_desc ixp4xx_io_desc[] __initdata = {
{ /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
.virtual = IXP4XX_PERIPHERAL_BASE_VIRT,
- .physical = IXP4XX_PERIPHERAL_BASE_PHYS,
+ .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
.length = IXP4XX_PERIPHERAL_REGION_SIZE,
.type = MT_DEVICE
}, { /* Expansion Bus Config Registers */
.virtual = IXP4XX_EXP_CFG_BASE_VIRT,
- .physical = IXP4XX_EXP_CFG_BASE_PHYS,
+ .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
.length = IXP4XX_EXP_CFG_REGION_SIZE,
.type = MT_DEVICE
}, { /* PCI Registers */
.virtual = IXP4XX_PCI_CFG_BASE_VIRT,
- .physical = IXP4XX_PCI_CFG_BASE_PHYS,
+ .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
.length = IXP4XX_PCI_CFG_REGION_SIZE,
.type = MT_DEVICE
+ },
+#ifdef CONFIG_DEBUG_LL
+ { /* Debug UART mapping */
+ .virtual = IXP4XX_DEBUG_UART_BASE_VIRT,
+ .pfn = __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
+ .length = IXP4XX_DEBUG_UART_REGION_SIZE,
+ .type = MT_DEVICE
}
+#endif
};
void __init ixp4xx_map_io(void)
*
* 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. Also, we should use a different chip structure for
- * level-based GPIO vs edge-based GPIO. Currently nobody needs this as
- * all HW that's publically available uses level IRQs, so we'll
- * worry about it if/when we have HW to test.
+ * as an IRQ.
**************************************************************************/
-static void ixp4xx_irq_mask(unsigned int irq)
+enum ixp4xx_irq_type {
+ IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
+};
+
+static void ixp4xx_config_irq(unsigned irq, enum ixp4xx_irq_type type);
+
+/*
+ * 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_set_irq_type(unsigned int irq, unsigned int type)
{
- *IXP4XX_ICMR &= ~(1 << irq);
+ int line = irq2gpio[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 IRQT_BOTHEDGE:
+ int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
+ irq_type = IXP4XX_IRQ_EDGE;
+ break;
+ case IRQT_RISING:
+ int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
+ irq_type = IXP4XX_IRQ_EDGE;
+ break;
+ case IRQT_FALLING:
+ int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
+ irq_type = IXP4XX_IRQ_EDGE;
+ break;
+ case IRQT_HIGH:
+ int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
+ irq_type = IXP4XX_IRQ_LEVEL;
+ break;
+ case IRQT_LOW:
+ int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
+ irq_type = IXP4XX_IRQ_LEVEL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ ixp4xx_config_irq(irq, irq_type);
+
+ 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(line, IXP4XX_GPIO_IN);
+
+ return 0;
}
-static void ixp4xx_irq_mask_ack(unsigned int irq)
+static void ixp4xx_irq_mask(unsigned int irq)
{
- ixp4xx_irq_mask(irq);
+ if (cpu_is_ixp46x() && irq >= 32)
+ *IXP4XX_ICMR2 &= ~(1 << (irq - 32));
+ else
+ *IXP4XX_ICMR &= ~(1 << irq);
}
static void ixp4xx_irq_unmask(unsigned int irq)
{
- static int irq2gpio[NR_IRQS] = {
- -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,
- };
- int line = irq2gpio[irq];
+ if (cpu_is_ixp46x() && irq >= 32)
+ *IXP4XX_ICMR2 |= (1 << (irq - 32));
+ else
+ *IXP4XX_ICMR |= (1 << irq);
+}
+
+static void ixp4xx_irq_ack(unsigned int irq)
+{
+ int line = (irq < 32) ? irq2gpio[irq] : -1;
- /*
- * This only works for LEVEL gpio IRQs as per the IXP4xx developer's
- * manual. If edge-triggered, need to move it to the mask_ack.
- * Nobody seems to be using the edge-triggered mode on the GPIOs.
- */
if (line >= 0)
- gpio_line_isr_clear(line);
+ *IXP4XX_GPIO_GPISR = (1 << line);
+}
- *IXP4XX_ICMR |= (1 << irq);
+/*
+ * Level triggered interrupts on GPIO lines can only be cleared when the
+ * interrupt condition disappears.
+ */
+static void ixp4xx_irq_level_unmask(unsigned int irq)
+{
+ ixp4xx_irq_ack(irq);
+ ixp4xx_irq_unmask(irq);
}
-static struct irqchip ixp4xx_irq_chip = {
- .ack = ixp4xx_irq_mask_ack,
- .mask = ixp4xx_irq_mask,
- .unmask = ixp4xx_irq_unmask,
+static struct irqchip ixp4xx_irq_level_chip = {
+ .ack = ixp4xx_irq_mask,
+ .mask = ixp4xx_irq_mask,
+ .unmask = ixp4xx_irq_level_unmask,
+ .set_type = ixp4xx_set_irq_type,
};
+static struct irqchip ixp4xx_irq_edge_chip = {
+ .ack = ixp4xx_irq_ack,
+ .mask = ixp4xx_irq_mask,
+ .unmask = ixp4xx_irq_unmask,
+ .set_type = ixp4xx_set_irq_type,
+};
+
+static void ixp4xx_config_irq(unsigned irq, enum ixp4xx_irq_type type)
+{
+ switch (type) {
+ case IXP4XX_IRQ_LEVEL:
+ set_irq_chip(irq, &ixp4xx_irq_level_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ break;
+ case IXP4XX_IRQ_EDGE:
+ set_irq_chip(irq, &ixp4xx_irq_edge_chip);
+ set_irq_handler(irq, do_edge_IRQ);
+ break;
+ }
+ set_irq_flags(irq, IRQF_VALID);
+}
+
void __init ixp4xx_init_irq(void)
{
int i = 0;
/* Disable all interrupt */
*IXP4XX_ICMR = 0x0;
- for(i = 0; i < NR_IRQS; i++)
- {
- set_irq_chip(i, &ixp4xx_irq_chip);
- set_irq_handler(i, do_level_IRQ);
- set_irq_flags(i, IRQF_VALID);
+ if (cpu_is_ixp46x()) {
+ /* 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++)
+ ixp4xx_config_irq(i, IXP4XX_IRQ_LEVEL);
}
static unsigned volatile last_jiffy_time;
-#define CLOCK_TICKS_PER_USEC (CLOCK_TICK_RATE / USEC_PER_SEC)
+#define CLOCK_TICKS_PER_USEC ((CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC)
/* IRQs are disabled before entering here from do_gettimeofday() */
static unsigned long ixp4xx_gettimeoffset(void)
static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
+ write_seqlock(&xtime_lock);
+
/* Clear Pending Interrupt by writing '1' to it */
*IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
/*
* Catch up with the real idea of time
*/
- do {
+ while ((*IXP4XX_OSTS - last_jiffy_time) > LATCH) {
timer_tick(regs);
last_jiffy_time += LATCH;
- } while((*IXP4XX_OSTS - last_jiffy_time) > LATCH);
+ }
+
+ write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
static struct irqaction ixp4xx_timer_irq = {
.name = "IXP4xx Timer Tick",
- .flags = SA_INTERRUPT,
- .handler = ixp4xx_timer_interrupt
+ .flags = SA_INTERRUPT | SA_TIMER,
+ .handler = ixp4xx_timer_interrupt,
};
-void __init ixp4xx_init_time(void)
+static void __init ixp4xx_timer_init(void)
{
- gettimeoffset = ixp4xx_gettimeoffset;
-
/* Clear Pending Interrupt by writing '1' to it */
*IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq);
}
+struct sys_timer ixp4xx_timer = {
+ .init = ixp4xx_timer_init,
+ .offset = ixp4xx_gettimeoffset,
+};
+
+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;
+
+ 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);
+}
git://git.onelab.eu / linux-2.6.git / blobdiff