/* * arch/arm/mach-ixp4xx/common.c * * Generic code shared across all IXP4XX platforms * * Maintainer: Deepak Saxena * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /************************************************************************* * 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, .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. 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. **************************************************************************/ static void ixp4xx_irq_mask(unsigned int irq) { *IXP4XX_ICMR &= ~(1 << irq); } static void ixp4xx_irq_mask_ack(unsigned int irq) { ixp4xx_irq_mask(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]; /* * 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_ICMR |= (1 << irq); } static struct irqchip ixp4xx_irq_chip = { .ack = ixp4xx_irq_mask_ack, .mask = ixp4xx_irq_mask, .unmask = ixp4xx_irq_unmask, }; 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; 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); } } /************************************************************************* * 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) /* 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) { /* Clear Pending Interrupt by writing '1' to it */ *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND; /* * Catch up with the real idea of time */ do { do_timer(regs); last_jiffy_time += LATCH; } while((*IXP4XX_OSTS - last_jiffy_time) > LATCH); return IRQ_HANDLED; } extern unsigned long (*gettimeoffset)(void); static struct irqaction timer_irq = { .name = "IXP4xx Timer Tick", .flags = SA_INTERRUPT }; void __init time_init(void) { gettimeoffset = ixp4xx_gettimeoffset; timer_irq.handler = ixp4xx_timer_interrupt; /* 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, &timer_irq); }