diff options
Diffstat (limited to 'arch/arm/mach-clps711x/common.c')
| -rw-r--r-- | arch/arm/mach-clps711x/common.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/arch/arm/mach-clps711x/common.c b/arch/arm/mach-clps711x/common.c new file mode 100644 index 000000000000..ced2a4e406f4 --- /dev/null +++ b/arch/arm/mach-clps711x/common.c @@ -0,0 +1,222 @@ +/* + * linux/arch/arm/mach-clps711x/core.c + * + * Core support for the CLPS711x-based machines. + * + * Copyright (C) 2001,2011 Deep Blue Solutions Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/sched.h> +#include <linux/timex.h> + +#include <asm/sizes.h> +#include <mach/hardware.h> +#include <asm/irq.h> +#include <asm/leds.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/mach/map.h> +#include <asm/mach/time.h> +#include <asm/hardware/clps7111.h> + +/* + * This maps the generic CLPS711x registers + */ +static struct map_desc clps711x_io_desc[] __initdata = { + { + .virtual = CLPS7111_VIRT_BASE, + .pfn = __phys_to_pfn(CLPS7111_PHYS_BASE), + .length = SZ_1M, + .type = MT_DEVICE + } +}; + +void __init clps711x_map_io(void) +{ + iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc)); +} + +static void int1_mask(struct irq_data *d) +{ + u32 intmr1; + + intmr1 = clps_readl(INTMR1); + intmr1 &= ~(1 << d->irq); + clps_writel(intmr1, INTMR1); +} + +static void int1_ack(struct irq_data *d) +{ + u32 intmr1; + + intmr1 = clps_readl(INTMR1); + intmr1 &= ~(1 << d->irq); + clps_writel(intmr1, INTMR1); + + switch (d->irq) { + case IRQ_CSINT: clps_writel(0, COEOI); break; + case IRQ_TC1OI: clps_writel(0, TC1EOI); break; + case IRQ_TC2OI: clps_writel(0, TC2EOI); break; + case IRQ_RTCMI: clps_writel(0, RTCEOI); break; + case IRQ_TINT: clps_writel(0, TEOI); break; + case IRQ_UMSINT: clps_writel(0, UMSEOI); break; + } +} + +static void int1_unmask(struct irq_data *d) +{ + u32 intmr1; + + intmr1 = clps_readl(INTMR1); + intmr1 |= 1 << d->irq; + clps_writel(intmr1, INTMR1); +} + +static struct irq_chip int1_chip = { + .irq_ack = int1_ack, + .irq_mask = int1_mask, + .irq_unmask = int1_unmask, +}; + +static void int2_mask(struct irq_data *d) +{ + u32 intmr2; + + intmr2 = clps_readl(INTMR2); + intmr2 &= ~(1 << (d->irq - 16)); + clps_writel(intmr2, INTMR2); +} + +static void int2_ack(struct irq_data *d) +{ + u32 intmr2; + + intmr2 = clps_readl(INTMR2); + intmr2 &= ~(1 << (d->irq - 16)); + clps_writel(intmr2, INTMR2); + + switch (d->irq) { + case IRQ_KBDINT: clps_writel(0, KBDEOI); break; + } +} + +static void int2_unmask(struct irq_data *d) +{ + u32 intmr2; + + intmr2 = clps_readl(INTMR2); + intmr2 |= 1 << (d->irq - 16); + clps_writel(intmr2, INTMR2); +} + +static struct irq_chip int2_chip = { + .irq_ack = int2_ack, + .irq_mask = int2_mask, + .irq_unmask = int2_unmask, +}; + +void __init clps711x_init_irq(void) +{ + unsigned int i; + + for (i = 0; i < NR_IRQS; i++) { + if (INT1_IRQS & (1 << i)) { + irq_set_chip_and_handler(i, &int1_chip, + handle_level_irq); + set_irq_flags(i, IRQF_VALID | IRQF_PROBE); + } + if (INT2_IRQS & (1 << i)) { + irq_set_chip_and_handler(i, &int2_chip, + handle_level_irq); + set_irq_flags(i, IRQF_VALID | IRQF_PROBE); + } + } + + /* + * Disable interrupts + */ + clps_writel(0, INTMR1); + clps_writel(0, INTMR2); + + /* + * Clear down any pending interrupts + */ + clps_writel(0, COEOI); + clps_writel(0, TC1EOI); + clps_writel(0, TC2EOI); + clps_writel(0, RTCEOI); + clps_writel(0, TEOI); + clps_writel(0, UMSEOI); + clps_writel(0, SYNCIO); + clps_writel(0, KBDEOI); +} + +/* + * gettimeoffset() returns time since last timer tick, in usecs. + * + * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy. + * 'tick' is usecs per jiffy. + */ +static unsigned long clps711x_gettimeoffset(void) +{ + unsigned long hwticks; + hwticks = LATCH - (clps_readl(TC2D) & 0xffff); /* since last underflow */ + return (hwticks * (tick_nsec / 1000)) / LATCH; +} + +/* + * IRQ handler for the timer + */ +static irqreturn_t p720t_timer_interrupt(int irq, void *dev_id) +{ + timer_tick(); + return IRQ_HANDLED; +} + +static struct irqaction clps711x_timer_irq = { + .name = "CLPS711x Timer Tick", + .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, + .handler = p720t_timer_interrupt, +}; + +static void __init clps711x_timer_init(void) +{ + struct timespec tv; + unsigned int syscon; + + syscon = clps_readl(SYSCON1); + syscon |= SYSCON1_TC2S | SYSCON1_TC2M; + clps_writel(syscon, SYSCON1); + + clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */ + + setup_irq(IRQ_TC2OI, &clps711x_timer_irq); + + tv.tv_nsec = 0; + tv.tv_sec = clps_readl(RTCDR); + do_settimeofday(&tv); +} + +struct sys_timer clps711x_timer = { + .init = clps711x_timer_init, + .offset = clps711x_gettimeoffset, +}; |