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 #include <asm/system_misc.h>
  41
  42 /*
  43  * This maps the generic CLPS711x registers
  44  */
  45 static struct map_desc clps711x_io_desc[] __initdata = {
  46         {
  47                 .virtual        = CLPS7111_VIRT_BASE,
  48                 .pfn            = __phys_to_pfn(CLPS7111_PHYS_BASE),
  49                 .length         = SZ_1M,
  50                 .type           = MT_DEVICE
  51         }
  52 };
  53
  54 void __init clps711x_map_io(void)
  55 {
  56         iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
  57 }
  58
  59 static void int1_mask(struct irq_data *d)
  60 {
  61         u32 intmr1;
  62
  63         intmr1 = clps_readl(INTMR1);
  64         intmr1 &= ~(1 << d->irq);
  65         clps_writel(intmr1, INTMR1);
  66 }
  67
  68 static void int1_ack(struct irq_data *d)
  69 {
  70         u32 intmr1;
  71
  72         intmr1 = clps_readl(INTMR1);
  73         intmr1 &= ~(1 << d->irq);
  74         clps_writel(intmr1, INTMR1);
  75
  76         switch (d->irq) {
  77         case IRQ_CSINT:  clps_writel(0, COEOI);  break;
  78         case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
  79         case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
  80         case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
  81         case IRQ_TINT:   clps_writel(0, TEOI);   break;
  82         case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
  83         }
  84 }
  85
  86 static void int1_unmask(struct irq_data *d)
  87 {
  88         u32 intmr1;
  89
  90         intmr1 = clps_readl(INTMR1);
  91         intmr1 |= 1 << d->irq;
  92         clps_writel(intmr1, INTMR1);
  93 }
  94
  95 static struct irq_chip int1_chip = {
  96         .irq_ack        = int1_ack,
  97         .irq_mask       = int1_mask,
  98         .irq_unmask     = int1_unmask,
  99 };
 100
 101 static void int2_mask(struct irq_data *d)
 102 {
 103         u32 intmr2;
 104
 105         intmr2 = clps_readl(INTMR2);
 106         intmr2 &= ~(1 << (d->irq - 16));
 107         clps_writel(intmr2, INTMR2);
 108 }
 109
 110 static void int2_ack(struct irq_data *d)
 111 {
 112         u32 intmr2;
 113
 114         intmr2 = clps_readl(INTMR2);
 115         intmr2 &= ~(1 << (d->irq - 16));
 116         clps_writel(intmr2, INTMR2);
 117
 118         switch (d->irq) {
 119         case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
 120         }
 121 }
 122
 123 static void int2_unmask(struct irq_data *d)
 124 {
 125         u32 intmr2;
 126
 127         intmr2 = clps_readl(INTMR2);
 128         intmr2 |= 1 << (d->irq - 16);
 129         clps_writel(intmr2, INTMR2);
 130 }
 131
 132 static struct irq_chip int2_chip = {
 133         .irq_ack        = int2_ack,
 134         .irq_mask       = int2_mask,
 135         .irq_unmask     = int2_unmask,
 136 };
 137
 138 void __init clps711x_init_irq(void)
 139 {
 140         unsigned int i;
 141
 142         for (i = 0; i < NR_IRQS; i++) {
 143                 if (INT1_IRQS & (1 << i)) {
 144                         irq_set_chip_and_handler(i, &int1_chip,
 145                                                  handle_level_irq);
 146                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 147                 }
 148                 if (INT2_IRQS & (1 << i)) {
 149                         irq_set_chip_and_handler(i, &int2_chip,
 150                                                  handle_level_irq);
 151                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 152                 }
 153         }
 154
 155         /*
 156          * Disable interrupts
 157          */
 158         clps_writel(0, INTMR1);
 159         clps_writel(0, INTMR2);
 160
 161         /*
 162          * Clear down any pending interrupts
 163          */
 164         clps_writel(0, COEOI);
 165         clps_writel(0, TC1EOI);
 166         clps_writel(0, TC2EOI);
 167         clps_writel(0, RTCEOI);
 168         clps_writel(0, TEOI);
 169         clps_writel(0, UMSEOI);
 170         clps_writel(0, SYNCIO);
 171         clps_writel(0, KBDEOI);
 172 }
 173
 174 /*
 175  * gettimeoffset() returns time since last timer tick, in usecs.
 176  *
 177  * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
 178  * 'tick' is usecs per jiffy.
 179  */
 180 static unsigned long clps711x_gettimeoffset(void)
 181 {
 182         unsigned long hwticks;
 183         hwticks = LATCH - (clps_readl(TC2D) & 0xffff);  /* since last underflow */
 184         return (hwticks * (tick_nsec / 1000)) / LATCH;
 185 }
 186
 187 /*
 188  * IRQ handler for the timer
 189  */
 190 static irqreturn_t p720t_timer_interrupt(int irq, void *dev_id)
 191 {
 192         timer_tick();
 193         return IRQ_HANDLED;
 194 }
 195
 196 static struct irqaction clps711x_timer_irq = {
 197         .name           = "CLPS711x Timer Tick",
 198         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 199         .handler        = p720t_timer_interrupt,
 200 };
 201
 202 static void __init clps711x_timer_init(void)
 203 {
 204         struct timespec tv;
 205         unsigned int syscon;
 206
 207         syscon = clps_readl(SYSCON1);
 208         syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
 209         clps_writel(syscon, SYSCON1);
 210
 211         clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
 212
 213         setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
 214
 215         tv.tv_nsec = 0;
 216         tv.tv_sec = clps_readl(RTCDR);
 217         do_settimeofday(&tv);
 218 }
 219
 220 struct sys_timer clps711x_timer = {
 221         .init           = clps711x_timer_init,
 222         .offset         = clps711x_gettimeoffset,
 223 };
 224
 225 void clps711x_restart(char mode, const char *cmd)
 226 {
 227         soft_restart(0);
 228 }
 229
 230 static void clps711x_idle(void)
 231 {
 232         clps_writel(1, HALT);
 233         __asm__ __volatile__(
 234         "mov    r0, r0\n\
 235         mov     r0, r0");
 236 }
 237
 238 static int __init clps711x_idle_init(void)
 239 {
 240         arm_pm_idle = clps711x_idle;
 241         return 0;
 242 }
 243
 244 arch_initcall(clps711x_idle_init);