/* * arch/arm/mach-ixp23xx/core.c * * Core routines for IXP23xx chips * * Author: Deepak Saxena <dsaxena@plexity.net> * * Copyright 2005 (c) MontaVista Software, Inc. * * Based on 2.4 code Copyright 2004 (c) Intel Corporation * * 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/init.h> #include <linux/spinlock.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/serial.h> #include <linux/tty.h> #include <linux/bitops.h> #include <linux/serial_8250.h> #include <linux/serial_core.h> #include <linux/device.h> #include <linux/mm.h> #include <linux/time.h> #include <linux/timex.h> #include <asm/types.h> #include <asm/setup.h> #include <asm/memory.h> #include <mach/hardware.h> #include <asm/irq.h> #include <asm/system.h> #include <asm/tlbflush.h> #include <asm/pgtable.h> #include <asm/mach/map.h> #include <asm/mach/time.h> #include <asm/mach/irq.h> #include <asm/mach/arch.h> /************************************************************************* * Chip specific mappings shared by all IXP23xx systems *************************************************************************/ static struct map_desc ixp23xx_io_desc[] __initdata = { { /* XSI-CPP CSRs */ .virtual = IXP23XX_XSI2CPP_CSR_VIRT, .pfn = __phys_to_pfn(IXP23XX_XSI2CPP_CSR_PHYS), .length = IXP23XX_XSI2CPP_CSR_SIZE, .type = MT_DEVICE, }, { /* Expansion Bus Config */ .virtual = IXP23XX_EXP_CFG_VIRT, .pfn = __phys_to_pfn(IXP23XX_EXP_CFG_PHYS), .length = IXP23XX_EXP_CFG_SIZE, .type = MT_DEVICE, }, { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACS,.... */ .virtual = IXP23XX_PERIPHERAL_VIRT, .pfn = __phys_to_pfn(IXP23XX_PERIPHERAL_PHYS), .length = IXP23XX_PERIPHERAL_SIZE, .type = MT_DEVICE, }, { /* CAP CSRs */ .virtual = IXP23XX_CAP_CSR_VIRT, .pfn = __phys_to_pfn(IXP23XX_CAP_CSR_PHYS), .length = IXP23XX_CAP_CSR_SIZE, .type = MT_DEVICE, }, { /* MSF CSRs */ .virtual = IXP23XX_MSF_CSR_VIRT, .pfn = __phys_to_pfn(IXP23XX_MSF_CSR_PHYS), .length = IXP23XX_MSF_CSR_SIZE, .type = MT_DEVICE, }, { /* PCI I/O Space */ .virtual = IXP23XX_PCI_IO_VIRT, .pfn = __phys_to_pfn(IXP23XX_PCI_IO_PHYS), .length = IXP23XX_PCI_IO_SIZE, .type = MT_DEVICE, }, { /* PCI Config Space */ .virtual = IXP23XX_PCI_CFG_VIRT, .pfn = __phys_to_pfn(IXP23XX_PCI_CFG_PHYS), .length = IXP23XX_PCI_CFG_SIZE, .type = MT_DEVICE, }, { /* PCI local CFG CSRs */ .virtual = IXP23XX_PCI_CREG_VIRT, .pfn = __phys_to_pfn(IXP23XX_PCI_CREG_PHYS), .length = IXP23XX_PCI_CREG_SIZE, .type = MT_DEVICE, }, { /* PCI MEM Space */ .virtual = IXP23XX_PCI_MEM_VIRT, .pfn = __phys_to_pfn(IXP23XX_PCI_MEM_PHYS), .length = IXP23XX_PCI_MEM_SIZE, .type = MT_DEVICE, } }; void __init ixp23xx_map_io(void) { iotable_init(ixp23xx_io_desc, ARRAY_SIZE(ixp23xx_io_desc)); } /*************************************************************************** * IXP23xx Interrupt Handling ***************************************************************************/ enum ixp23xx_irq_type { IXP23XX_IRQ_LEVEL, IXP23XX_IRQ_EDGE }; static void ixp23xx_config_irq(unsigned int, enum ixp23xx_irq_type); static int ixp23xx_irq_set_type(struct irq_data *d, unsigned int type) { int line = d->irq - IRQ_IXP23XX_GPIO6 + 6; u32 int_style; enum ixp23xx_irq_type irq_type; volatile u32 *int_reg; /* * Only GPIOs 6-15 are wired to interrupts on IXP23xx */ if (line < 6 || line > 15) return -EINVAL; switch (type) { case IRQ_TYPE_EDGE_BOTH: int_style = IXP23XX_GPIO_STYLE_TRANSITIONAL; irq_type = IXP23XX_IRQ_EDGE; break; case IRQ_TYPE_EDGE_RISING: int_style = IXP23XX_GPIO_STYLE_RISING_EDGE; irq_type = IXP23XX_IRQ_EDGE; break; case IRQ_TYPE_EDGE_FALLING: int_style = IXP23XX_GPIO_STYLE_FALLING_EDGE; irq_type = IXP23XX_IRQ_EDGE; break; case IRQ_TYPE_LEVEL_HIGH: int_style = IXP23XX_GPIO_STYLE_ACTIVE_HIGH; irq_type = IXP23XX_IRQ_LEVEL; break; case IRQ_TYPE_LEVEL_LOW: int_style = IXP23XX_GPIO_STYLE_ACTIVE_LOW; irq_type = IXP23XX_IRQ_LEVEL; break; default: return -EINVAL; } ixp23xx_config_irq(d->irq, irq_type); if (line >= 8) { /* pins 8-15 */ line -= 8; int_reg = (volatile u32 *)IXP23XX_GPIO_GPIT2R; } else { /* pins 0-7 */ int_reg = (volatile u32 *)IXP23XX_GPIO_GPIT1R; } /* * Clear pending interrupts */ *IXP23XX_GPIO_GPISR = (1 << line); /* Clear the style for the appropriate pin */ *int_reg &= ~(IXP23XX_GPIO_STYLE_MASK << (line * IXP23XX_GPIO_STYLE_SIZE)); /* Set the new style */ *int_reg |= (int_style << (line * IXP23XX_GPIO_STYLE_SIZE)); return 0; } static void ixp23xx_irq_mask(struct irq_data *d) { volatile unsigned long *intr_reg; unsigned int irq = d->irq; if (irq >= 56) irq += 8; intr_reg = IXP23XX_INTR_EN1 + (irq / 32); *intr_reg &= ~(1 << (irq % 32)); } static void ixp23xx_irq_ack(struct irq_data *d) { int line = d->irq - IRQ_IXP23XX_GPIO6 + 6; if ((line < 6) || (line > 15)) return; *IXP23XX_GPIO_GPISR = (1 << line); } /* * Level triggered interrupts on GPIO lines can only be cleared when the * interrupt condition disappears. */ static void ixp23xx_irq_level_unmask(struct irq_data *d) { volatile unsigned long *intr_reg; unsigned int irq = d->irq; ixp23xx_irq_ack(d); if (irq >= 56) irq += 8; intr_reg = IXP23XX_INTR_EN1 + (irq / 32); *intr_reg |= (1 << (irq % 32)); } static void ixp23xx_irq_edge_unmask(struct irq_data *d) { volatile unsigned long *intr_reg; unsigned int irq = d->irq; if (irq >= 56) irq += 8; intr_reg = IXP23XX_INTR_EN1 + (irq / 32); *intr_reg |= (1 << (irq % 32)); } static struct irq_chip ixp23xx_irq_level_chip = { .irq_ack = ixp23xx_irq_mask, .irq_mask = ixp23xx_irq_mask, .irq_unmask = ixp23xx_irq_level_unmask, .irq_set_type = ixp23xx_irq_set_type }; static struct irq_chip ixp23xx_irq_edge_chip = { .irq_ack = ixp23xx_irq_ack, .irq_mask = ixp23xx_irq_mask, .irq_unmask = ixp23xx_irq_edge_unmask, .irq_set_type = ixp23xx_irq_set_type }; static void ixp23xx_pci_irq_mask(struct irq_data *d) { unsigned int irq = d->irq; *IXP23XX_PCI_XSCALE_INT_ENABLE &= ~(1 << (IRQ_IXP23XX_INTA + 27 - irq)); } static void ixp23xx_pci_irq_unmask(struct irq_data *d) { unsigned int irq = d->irq; *IXP23XX_PCI_XSCALE_INT_ENABLE |= (1 << (IRQ_IXP23XX_INTA + 27 - irq)); } /* * TODO: Should this just be done at ASM level? */ static void pci_handler(unsigned int irq, struct irq_desc *desc) { u32 pci_interrupt; unsigned int irqno; pci_interrupt = *IXP23XX_PCI_XSCALE_INT_STATUS; desc->irq_data.chip->irq_ack(&desc->irq_data); /* See which PCI_INTA, or PCI_INTB interrupted */ if (pci_interrupt & (1 << 26)) { irqno = IRQ_IXP23XX_INTB; } else if (pci_interrupt & (1 << 27)) { irqno = IRQ_IXP23XX_INTA; } else { BUG(); } generic_handle_irq(irqno); desc->irq_data.chip->irq_unmask(&desc->irq_data); } static struct irq_chip ixp23xx_pci_irq_chip = { .irq_ack = ixp23xx_pci_irq_mask, .irq_mask = ixp23xx_pci_irq_mask, .irq_unmask = ixp23xx_pci_irq_unmask }; static void ixp23xx_config_irq(unsigned int irq, enum ixp23xx_irq_type type) { switch (type) { case IXP23XX_IRQ_LEVEL: set_irq_chip(irq, &ixp23xx_irq_level_chip); set_irq_handler(irq, handle_level_irq); break; case IXP23XX_IRQ_EDGE: set_irq_chip(irq, &ixp23xx_irq_edge_chip); set_irq_handler(irq, handle_edge_irq); break; } set_irq_flags(irq, IRQF_VALID); } void __init ixp23xx_init_irq(void) { int irq; /* Route everything to IRQ */ *IXP23XX_INTR_SEL1 = 0x0; *IXP23XX_INTR_SEL2 = 0x0; *IXP23XX_INTR_SEL3 = 0x0; *IXP23XX_INTR_SEL4 = 0x0; /* Mask all sources */ *IXP23XX_INTR_EN1 = 0x0; *IXP23XX_INTR_EN2 = 0x0; *IXP23XX_INTR_EN3 = 0x0; *IXP23XX_INTR_EN4 = 0x0; /* * Configure all IRQs for level-sensitive operation */ for (irq = 0; irq <= NUM_IXP23XX_RAW_IRQS; irq++) { ixp23xx_config_irq(irq, IXP23XX_IRQ_LEVEL); } for (irq = IRQ_IXP23XX_INTA; irq <= IRQ_IXP23XX_INTB; irq++) { set_irq_chip(irq, &ixp23xx_pci_irq_chip); set_irq_handler(irq, handle_level_irq); set_irq_flags(irq, IRQF_VALID); } set_irq_chained_handler(IRQ_IXP23XX_PCI_INT_RPH, pci_handler); } /************************************************************************* * Timer-tick functions for IXP23xx *************************************************************************/ #define CLOCK_TICKS_PER_USEC (CLOCK_TICK_RATE / USEC_PER_SEC) static unsigned long next_jiffy_time; static unsigned long ixp23xx_gettimeoffset(void) { unsigned long elapsed; elapsed = *IXP23XX_TIMER_CONT - (next_jiffy_time - LATCH); return elapsed / CLOCK_TICKS_PER_USEC; } static irqreturn_t ixp23xx_timer_interrupt(int irq, void *dev_id) { /* Clear Pending Interrupt by writing '1' to it */ *IXP23XX_TIMER_STATUS = IXP23XX_TIMER1_INT_PEND; while ((signed long)(*IXP23XX_TIMER_CONT - next_jiffy_time) >= LATCH) { timer_tick(); next_jiffy_time += LATCH; } return IRQ_HANDLED; } static struct irqaction ixp23xx_timer_irq = { .name = "IXP23xx Timer Tick", .handler = ixp23xx_timer_interrupt, .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, }; void __init ixp23xx_init_timer(void) { /* Clear Pending Interrupt by writing '1' to it */ *IXP23XX_TIMER_STATUS = IXP23XX_TIMER1_INT_PEND; /* Setup the Timer counter value */ *IXP23XX_TIMER1_RELOAD = (LATCH & ~IXP23XX_TIMER_RELOAD_MASK) | IXP23XX_TIMER_ENABLE; *IXP23XX_TIMER_CONT = 0; next_jiffy_time = LATCH; /* Connect the interrupt handler and enable the interrupt */ setup_irq(IRQ_IXP23XX_TIMER1, &ixp23xx_timer_irq); } struct sys_timer ixp23xx_timer = { .init = ixp23xx_init_timer, .offset = ixp23xx_gettimeoffset, }; /************************************************************************* * IXP23xx Platform Initialization *************************************************************************/ static struct resource ixp23xx_uart_resources[] = { { .start = IXP23XX_UART1_PHYS, .end = IXP23XX_UART1_PHYS + 0x0fff, .flags = IORESOURCE_MEM }, { .start = IXP23XX_UART2_PHYS, .end = IXP23XX_UART2_PHYS + 0x0fff, .flags = IORESOURCE_MEM } }; static struct plat_serial8250_port ixp23xx_uart_data[] = { { .mapbase = IXP23XX_UART1_PHYS, .membase = (char *)(IXP23XX_UART1_VIRT + 3), .irq = IRQ_IXP23XX_UART1, .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, .iotype = UPIO_MEM, .regshift = 2, .uartclk = IXP23XX_UART_XTAL, }, { .mapbase = IXP23XX_UART2_PHYS, .membase = (char *)(IXP23XX_UART2_VIRT + 3), .irq = IRQ_IXP23XX_UART2, .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, .iotype = UPIO_MEM, .regshift = 2, .uartclk = IXP23XX_UART_XTAL, }, { }, }; static struct platform_device ixp23xx_uart = { .name = "serial8250", .id = 0, .dev.platform_data = ixp23xx_uart_data, .num_resources = 2, .resource = ixp23xx_uart_resources, }; static struct platform_device *ixp23xx_devices[] __initdata = { &ixp23xx_uart, }; void __init ixp23xx_sys_init(void) { *IXP23XX_EXP_UNIT_FUSE |= 0xf; platform_add_devices(ixp23xx_devices, ARRAY_SIZE(ixp23xx_devices)); }