arch/arm/mach-clps711x/common.c

   1 /*
   2  *  linux/arch/arm/mach-clps711x/core.c
   3  *
   4  *  Core support for the CLPS711x-based machines.
   5  *
   6  *  Copyright (C) 2001,2011 Deep Blue Solutions Ltd
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/irq.h>
  28 #include <linux/sched.h>
  29 #include <linux/timex.h>
  30
  31 #include <asm/sizes.h>
  32 #include <mach/hardware.h>
  33 #include <asm/irq.h>
  34 #include <asm/leds.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/page.h>
  37 #include <asm/mach/map.h>
  38 #include <asm/mach/time.h>
  39 #include <asm/hardware/clps7111.h>
  40
  41 /*
  42  * This maps the generic CLPS711x registers
  43  */
  44 static struct map_desc clps711x_io_desc[] __initdata = {
  45         {
  46                 .virtual        = CLPS7111_VIRT_BASE,
  47                 .pfn            = __phys_to_pfn(CLPS7111_PHYS_BASE),
  48                 .length         = SZ_1M,
  49                 .type           = MT_DEVICE
  50         }
  51 };
  52
  53 void __init clps711x_map_io(void)
  54 {
  55         iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
  56 }
  57
  58 static void int1_mask(struct irq_data *d)
  59 {
  60         u32 intmr1;
  61
  62         intmr1 = clps_readl(INTMR1);
  63         intmr1 &= ~(1 << d->irq);
  64         clps_writel(intmr1, INTMR1);
  65 }
  66
  67 static void int1_ack(struct irq_data *d)
  68 {
  69         u32 intmr1;
  70
  71         intmr1 = clps_readl(INTMR1);
  72         intmr1 &= ~(1 << d->irq);
  73         clps_writel(intmr1, INTMR1);
  74
  75         switch (d->irq) {
  76         case IRQ_CSINT:  clps_writel(0, COEOI);  break;
  77         case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
  78         case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
  79         case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
  80         case IRQ_TINT:   clps_writel(0, TEOI);   break;
  81         case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
  82         }
  83 }
  84
  85 static void int1_unmask(struct irq_data *d)
  86 {
  87         u32 intmr1;
  88
  89         intmr1 = clps_readl(INTMR1);
  90         intmr1 |= 1 << d->irq;
  91         clps_writel(intmr1, INTMR1);
  92 }
  93
  94 static struct irq_chip int1_chip = {
  95         .irq_ack        = int1_ack,
  96         .irq_mask       = int1_mask,
  97         .irq_unmask     = int1_unmask,
  98 };
  99
 100 static void int2_mask(struct irq_data *d)
 101 {
 102         u32 intmr2;
 103
 104         intmr2 = clps_readl(INTMR2);
 105         intmr2 &= ~(1 << (d->irq - 16));
 106         clps_writel(intmr2, INTMR2);
 107 }
 108
 109 static void int2_ack(struct irq_data *d)
 110 {
 111         u32 intmr2;
 112
 113         intmr2 = clps_readl(INTMR2);
 114         intmr2 &= ~(1 << (d->irq - 16));
 115         clps_writel(intmr2, INTMR2);
 116
 117         switch (d->irq) {
 118         case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
 119         }
 120 }
 121
 122 static void int2_unmask(struct irq_data *d)
 123 {
 124         u32 intmr2;
 125
 126         intmr2 = clps_readl(INTMR2);
 127         intmr2 |= 1 << (d->irq - 16);
 128         clps_writel(intmr2, INTMR2);
 129 }
 130
 131 static struct irq_chip int2_chip = {
 132         .irq_ack        = int2_ack,
 133         .irq_mask       = int2_mask,
 134         .irq_unmask     = int2_unmask,
 135 };
 136
 137 void __init clps711x_init_irq(void)
 138 {
 139         unsigned int i;
 140
 141         for (i = 0; i < NR_IRQS; i++) {
 142                 if (INT1_IRQS & (1 << i)) {
 143                         irq_set_chip_and_handler(i, &int1_chip,
 144                                                  handle_level_irq);
 145                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 146                 }
 147                 if (INT2_IRQS & (1 << i)) {
 148                         irq_set_chip_and_handler(i, &int2_chip,
 149                                                  handle_level_irq);
 150                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 151                 }
 152         }
 153
 154         /*
 155          * Disable interrupts
 156          */
 157         clps_writel(0, INTMR1);
 158         clps_writel(0, INTMR2);
 159
 160         /*
 161          * Clear down any pending interrupts
 162          */
 163         clps_writel(0, COEOI);
 164         clps_writel(0, TC1EOI);
 165         clps_writel(0, TC2EOI);
 166         clps_writel(0, RTCEOI);
 167         clps_writel(0, TEOI);
 168         clps_writel(0, UMSEOI);
 169         clps_writel(0, SYNCIO);
 170         clps_writel(0, KBDEOI);
 171 }
 172
 173 /*
 174  * gettimeoffset() returns time since last timer tick, in usecs.
 175  *
 176  * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
 177  * 'tick' is usecs per jiffy.
 178  */
 179 static unsigned long clps711x_gettimeoffset(void)
 180 {
 181         unsigned long hwticks;
 182         hwticks = LATCH - (clps_readl(TC2D) & 0xffff);  /* since last underflow */
 183         return (hwticks * (tick_nsec / 1000)) / LATCH;
 184 }
 185
 186 /*
 187  * IRQ handler for the timer
 188  */
 189 static irqreturn_t p720t_timer_interrupt(int irq, void *dev_id)
 190 {
 191         timer_tick();
 192         return IRQ_HANDLED;
 193 }
 194
 195 static struct irqaction clps711x_timer_irq = {
 196         .name           = "CLPS711x Timer Tick",
 197         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 198         .handler        = p720t_timer_interrupt,
 199 };
 200
 201 static void __init clps711x_timer_init(void)
 202 {
 203         struct timespec tv;
 204         unsigned int syscon;
 205
 206         syscon = clps_readl(SYSCON1);
 207         syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
 208         clps_writel(syscon, SYSCON1);
 209
 210         clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
 211
 212         setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
 213
 214         tv.tv_nsec = 0;
 215         tv.tv_sec = clps_readl(RTCDR);
 216         do_settimeofday(&tv);
 217 }
 218
 219 struct sys_timer clps711x_timer = {
 220         .init           = clps711x_timer_init,
 221         .offset         = clps711x_gettimeoffset,
 222 };
 223
 224 void clps711x_restart(char mode, const char *cmd)
 225 {
 226         soft_restart(0);
 227 }