+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/arch/arm/mach-ebsa110/core.c
- *
- * Copyright (C) 1998-2001 Russell King
- *
- * Extra MM routines for the EBSA-110 architecture
- */
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/serial_8250.h>
-#include <linux/init.h>
-#include <linux/io.h>
-
-#include <mach/hardware.h>
-#include <asm/irq.h>
-#include <asm/setup.h>
-#include <asm/mach-types.h>
-#include <asm/page.h>
-#include <asm/system_misc.h>
-
-#include <asm/mach/arch.h>
-#include <asm/mach/irq.h>
-#include <asm/mach/map.h>
-
-#include <asm/mach/time.h>
-
-#include "core.h"
-
-static void ebsa110_mask_irq(struct irq_data *d)
-{
- __raw_writeb(1 << d->irq, IRQ_MCLR);
-}
-
-static void ebsa110_unmask_irq(struct irq_data *d)
-{
- __raw_writeb(1 << d->irq, IRQ_MSET);
-}
-
-static struct irq_chip ebsa110_irq_chip = {
- .irq_ack = ebsa110_mask_irq,
- .irq_mask = ebsa110_mask_irq,
- .irq_unmask = ebsa110_unmask_irq,
-};
-
-static void __init ebsa110_init_irq(void)
-{
- unsigned long flags;
- unsigned int irq;
-
- local_irq_save(flags);
- __raw_writeb(0xff, IRQ_MCLR);
- __raw_writeb(0x55, IRQ_MSET);
- __raw_writeb(0x00, IRQ_MSET);
- if (__raw_readb(IRQ_MASK) != 0x55)
- while (1);
- __raw_writeb(0xff, IRQ_MCLR); /* clear all interrupt enables */
- local_irq_restore(flags);
-
- for (irq = 0; irq < NR_IRQS; irq++) {
- irq_set_chip_and_handler(irq, &ebsa110_irq_chip,
- handle_level_irq);
- irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
- }
-}
-
-static struct map_desc ebsa110_io_desc[] __initdata = {
- /*
- * sparse external-decode ISAIO space
- */
- { /* IRQ_STAT/IRQ_MCLR */
- .virtual = (unsigned long)IRQ_STAT,
- .pfn = __phys_to_pfn(TRICK4_PHYS),
- .length = TRICK4_SIZE,
- .type = MT_DEVICE
- }, { /* IRQ_MASK/IRQ_MSET */
- .virtual = (unsigned long)IRQ_MASK,
- .pfn = __phys_to_pfn(TRICK3_PHYS),
- .length = TRICK3_SIZE,
- .type = MT_DEVICE
- }, { /* SOFT_BASE */
- .virtual = (unsigned long)SOFT_BASE,
- .pfn = __phys_to_pfn(TRICK1_PHYS),
- .length = TRICK1_SIZE,
- .type = MT_DEVICE
- }, { /* PIT_BASE */
- .virtual = (unsigned long)PIT_BASE,
- .pfn = __phys_to_pfn(TRICK0_PHYS),
- .length = TRICK0_SIZE,
- .type = MT_DEVICE
- },
-
- /*
- * self-decode ISAIO space
- */
- {
- .virtual = ISAIO_BASE,
- .pfn = __phys_to_pfn(ISAIO_PHYS),
- .length = ISAIO_SIZE,
- .type = MT_DEVICE
- }, {
- .virtual = ISAMEM_BASE,
- .pfn = __phys_to_pfn(ISAMEM_PHYS),
- .length = ISAMEM_SIZE,
- .type = MT_DEVICE
- }
-};
-
-static void __init ebsa110_map_io(void)
-{
- iotable_init(ebsa110_io_desc, ARRAY_SIZE(ebsa110_io_desc));
-}
-
-static void __iomem *ebsa110_ioremap_caller(phys_addr_t cookie, size_t size,
- unsigned int flags, void *caller)
-{
- return (void __iomem *)cookie;
-}
-
-static void ebsa110_iounmap(volatile void __iomem *io_addr)
-{}
-
-static void __init ebsa110_init_early(void)
-{
- arch_ioremap_caller = ebsa110_ioremap_caller;
- arch_iounmap = ebsa110_iounmap;
-}
-
-#define PIT_CTRL (PIT_BASE + 0x0d)
-#define PIT_T2 (PIT_BASE + 0x09)
-#define PIT_T1 (PIT_BASE + 0x05)
-#define PIT_T0 (PIT_BASE + 0x01)
-
-/*
- * This is the rate at which your MCLK signal toggles (in Hz)
- * This was measured on a 10 digit frequency counter sampling
- * over 1 second.
- */
-#define MCLK 47894000
-
-/*
- * This is the rate at which the PIT timers get clocked
- */
-#define CLKBY7 (MCLK / 7)
-
-/*
- * This is the counter value. We tick at 200Hz on this platform.
- */
-#define COUNT ((CLKBY7 + (HZ / 2)) / HZ)
-
-/*
- * Get the time offset from the system PIT. Note that if we have missed an
- * interrupt, then the PIT counter will roll over (ie, be negative).
- * This actually works out to be convenient.
- */
-static u32 ebsa110_gettimeoffset(void)
-{
- unsigned long offset, count;
-
- __raw_writeb(0x40, PIT_CTRL);
- count = __raw_readb(PIT_T1);
- count |= __raw_readb(PIT_T1) << 8;
-
- /*
- * If count > COUNT, make the number negative.
- */
- if (count > COUNT)
- count |= 0xffff0000;
-
- offset = COUNT;
- offset -= count;
-
- /*
- * `offset' is in units of timer counts. Convert
- * offset to units of microseconds.
- */
- offset = offset * (1000000 / HZ) / COUNT;
-
- return offset * 1000;
-}
-
-static irqreturn_t
-ebsa110_timer_interrupt(int irq, void *dev_id)
-{
- u32 count;
-
- /* latch and read timer 1 */
- __raw_writeb(0x40, PIT_CTRL);
- count = __raw_readb(PIT_T1);
- count |= __raw_readb(PIT_T1) << 8;
-
- count += COUNT;
-
- __raw_writeb(count & 0xff, PIT_T1);
- __raw_writeb(count >> 8, PIT_T1);
-
- timer_tick();
-
- return IRQ_HANDLED;
-}
-
-/*
- * Set up timer interrupt.
- */
-void __init ebsa110_timer_init(void)
-{
- int irq = IRQ_EBSA110_TIMER0;
-
- arch_gettimeoffset = ebsa110_gettimeoffset;
-
- /*
- * Timer 1, mode 2, LSB/MSB
- */
- __raw_writeb(0x70, PIT_CTRL);
- __raw_writeb(COUNT & 0xff, PIT_T1);
- __raw_writeb(COUNT >> 8, PIT_T1);
-
- if (request_irq(irq, ebsa110_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
- "EBSA110 Timer Tick", NULL))
- pr_err("Failed to request irq %d (EBSA110 Timer Tick)\n", irq);
-}
-
-static struct plat_serial8250_port serial_platform_data[] = {
- {
- .iobase = 0x3f8,
- .irq = 1,
- .uartclk = 1843200,
- .regshift = 0,
- .iotype = UPIO_PORT,
- .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
- },
- {
- .iobase = 0x2f8,
- .irq = 2,
- .uartclk = 1843200,
- .regshift = 0,
- .iotype = UPIO_PORT,
- .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
- },
- { },
-};
-
-static struct platform_device serial_device = {
- .name = "serial8250",
- .id = PLAT8250_DEV_PLATFORM,
- .dev = {
- .platform_data = serial_platform_data,
- },
-};
-
-static struct resource am79c961_resources[] = {
- {
- .start = 0x220,
- .end = 0x238,
- .flags = IORESOURCE_IO,
- }, {
- .start = IRQ_EBSA110_ETHERNET,
- .end = IRQ_EBSA110_ETHERNET,
- .flags = IORESOURCE_IRQ,
- },
-};
-
-static struct platform_device am79c961_device = {
- .name = "am79c961",
- .id = -1,
- .num_resources = ARRAY_SIZE(am79c961_resources),
- .resource = am79c961_resources,
-};
-
-static struct platform_device *ebsa110_devices[] = {
- &serial_device,
- &am79c961_device,
-};
-
-/*
- * EBSA110 idling methodology:
- *
- * We can not execute the "wait for interrupt" instruction since that
- * will stop our MCLK signal (which provides the clock for the glue
- * logic, and therefore the timer interrupt).
- *
- * Instead, we spin, polling the IRQ_STAT register for the occurrence
- * of any interrupt with core clock down to the memory clock.
- */
-static void ebsa110_idle(void)
-{
- const char *irq_stat = (char *)0xff000000;
-
- /* disable clock switching */
- asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc");
-
- /* wait for an interrupt to occur */
- while (!*irq_stat);
-
- /* enable clock switching */
- asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");
-}
-
-static int __init ebsa110_init(void)
-{
- arm_pm_idle = ebsa110_idle;
- return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));
-}
-
-arch_initcall(ebsa110_init);
-
-static void ebsa110_restart(enum reboot_mode mode, const char *cmd)
-{
- soft_restart(0x80000000);
-}
-
-MACHINE_START(EBSA110, "EBSA110")
- /* Maintainer: Russell King */
- .atag_offset = 0x400,
- .reserve_lp0 = 1,
- .reserve_lp2 = 1,
- .map_io = ebsa110_map_io,
- .init_early = ebsa110_init_early,
- .init_irq = ebsa110_init_irq,
- .init_time = ebsa110_timer_init,
- .restart = ebsa110_restart,
-MACHINE_END
projects / linux-2.6-microblaze.git / blobdiff