diff options
Diffstat (limited to 'arch/arm/mach-ixp4xx/common.c')
| -rw-r--r-- | arch/arm/mach-ixp4xx/common.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c new file mode 100644 index 0000000..267ba02 --- /dev/null +++ b/arch/arm/mach-ixp4xx/common.c @@ -0,0 +1,353 @@ +/* + * 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/config.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/serial.h> +#include <linux/sched.h> +#include <linux/tty.h> +#include <linux/serial_core.h> +#include <linux/bootmem.h> +#include <linux/interrupt.h> +#include <linux/bitops.h> +#include <linux/time.h> +#include <linux/timex.h> + +#include <asm/hardware.h> +#include <asm/uaccess.h> +#include <asm/io.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/irq.h> + +#include <asm/mach/map.h> +#include <asm/mach/irq.h> +#include <asm/mach/time.h> + +enum ixp4xx_irq_type { + IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE +}; +static void ixp4xx_config_irq(unsigned irq, enum ixp4xx_irq_type type); + +/************************************************************************* + * 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) +{ + static const int gpio2irq[] = { + 6, 7, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 + }; + u32 enable; + volatile u32 *int_reg; + u32 int_style; + enum ixp4xx_irq_type irq_type; + + 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; + irq_type = IXP4XX_IRQ_LEVEL; + break; + case (IXP4XX_GPIO_ACTIVE_LOW): + int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW; + irq_type = IXP4XX_IRQ_LEVEL; + break; + case (IXP4XX_GPIO_RISING_EDGE): + int_style = IXP4XX_GPIO_STYLE_RISING_EDGE; + irq_type = IXP4XX_IRQ_EDGE; + break; + case (IXP4XX_GPIO_FALLING_EDGE): + int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE; + irq_type = IXP4XX_IRQ_EDGE; + break; + case (IXP4XX_GPIO_TRANSITIONAL): + int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL; + irq_type = IXP4XX_IRQ_EDGE; + break; + default: + int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH; + irq_type = IXP4XX_IRQ_LEVEL; + break; + } + + if (style & IXP4XX_GPIO_INTSTYLE_MASK) + ixp4xx_config_irq(gpio2irq[line], 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)); + + /* 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, + .length = IXP4XX_PERIPHERAL_REGION_SIZE, + .type = MT_DEVICE + }, { /* Expansion Bus Config Registers */ + .virtual = IXP4XX_EXP_CFG_BASE_VIRT, + .physical = 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, + .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)); +} + + +/************************************************************************* + * 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. + **************************************************************************/ +static void ixp4xx_irq_mask(unsigned int 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) +{ + if (cpu_is_ixp46x() && irq >= 32) + *IXP4XX_ICMR2 |= (1 << (irq - 32)); + else + *IXP4XX_ICMR |= (1 << irq); +} + +static void ixp4xx_irq_ack(unsigned int irq) +{ + static int 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, + }; + int line = (irq < 32) ? irq2gpio[irq] : -1; + + if (line >= 0) + gpio_line_isr_clear(line); +} + +/* + * 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_level_chip = { + .ack = ixp4xx_irq_mask, + .mask = ixp4xx_irq_mask, + .unmask = ixp4xx_irq_level_unmask, +}; + +static struct irqchip ixp4xx_irq_edge_chip = { + .ack = ixp4xx_irq_ack, + .mask = ixp4xx_irq_mask, + .unmask = ixp4xx_irq_unmask, +}; + +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; + + /* Route all sources to IRQ instead of FIQ */ + *IXP4XX_ICLR = 0x0; + + /* Disable all interrupt */ + *IXP4XX_ICMR = 0x0; + + 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); +} + + +/************************************************************************* + * 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 unsigned volatile last_jiffy_time; + +#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) +{ + u32 elapsed; + + elapsed = *IXP4XX_OSTS - last_jiffy_time; + + return elapsed / CLOCK_TICKS_PER_USEC; +} + +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 + */ + while ((*IXP4XX_OSTS - last_jiffy_time) > LATCH) { + timer_tick(regs); + 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 +}; + +static void __init ixp4xx_timer_init(void) +{ + /* Clear Pending Interrupt by writing '1' to it */ + *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND; + + /* Setup the Timer counter value */ + *IXP4XX_OSRT1 = (LATCH & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE; + + /* Reset time-stamp counter */ + *IXP4XX_OSTS = 0; + last_jiffy_time = 0; + + /* Connect the interrupt handler and enable the interrupt */ + 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 +}; + +void __init ixp4xx_sys_init(void) +{ + if (cpu_is_ixp46x()) { + platform_add_devices(ixp46x_devices, + ARRAY_SIZE(ixp46x_devices)); + } +} + |