/* * 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/platform_device.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> /************************************************************************* * 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, .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, .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, .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) { 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. **************************************************************************/ 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) { 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(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) { int line = (irq < 32) ? irq2gpio[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_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, .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; /* 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 ((signed long)(*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 | SA_TIMER, .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 }; 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); }