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/system_misc.h>
  40
  41 /*
  42  * This maps the generic CLPS711x registers
  43  */
  44 static struct map_desc clps711x_io_desc[] __initdata = {
  45         {
  46                 .virtual        = (unsigned long)CLPS711X_VIRT_BASE,
  47                 .pfn            = __phys_to_pfn(CLPS711X_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         switch (d->irq) {
  70         case IRQ_CSINT:  clps_writel(0, COEOI);  break;
  71         case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
  72         case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
  73         case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
  74         case IRQ_TINT:   clps_writel(0, TEOI);   break;
  75         case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
  76         }
  77 }
  78
  79 static void int1_unmask(struct irq_data *d)
  80 {
  81         u32 intmr1;
  82
  83         intmr1 = clps_readl(INTMR1);
  84         intmr1 |= 1 << d->irq;
  85         clps_writel(intmr1, INTMR1);
  86 }
  87
  88 static struct irq_chip int1_chip = {
  89         .irq_ack        = int1_ack,
  90         .irq_mask       = int1_mask,
  91         .irq_unmask     = int1_unmask,
  92 };
  93
  94 static void int2_mask(struct irq_data *d)
  95 {
  96         u32 intmr2;
  97
  98         intmr2 = clps_readl(INTMR2);
  99         intmr2 &= ~(1 << (d->irq - 16));
 100         clps_writel(intmr2, INTMR2);
 101 }
 102
 103 static void int2_ack(struct irq_data *d)
 104 {
 105         switch (d->irq) {
 106         case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
 107         }
 108 }
 109
 110 static void int2_unmask(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
 119 static struct irq_chip int2_chip = {
 120         .irq_ack        = int2_ack,
 121         .irq_mask       = int2_mask,
 122         .irq_unmask     = int2_unmask,
 123 };
 124
 125 void __init clps711x_init_irq(void)
 126 {
 127         unsigned int i;
 128
 129         for (i = 0; i < NR_IRQS; i++) {
 130                 if (INT1_IRQS & (1 << i)) {
 131                         irq_set_chip_and_handler(i, &int1_chip,
 132                                                  handle_level_irq);
 133                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 134                 }
 135                 if (INT2_IRQS & (1 << i)) {
 136                         irq_set_chip_and_handler(i, &int2_chip,
 137                                                  handle_level_irq);
 138                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 139                 }
 140         }
 141
 142         /*
 143          * Disable interrupts
 144          */
 145         clps_writel(0, INTMR1);
 146         clps_writel(0, INTMR2);
 147
 148         /*
 149          * Clear down any pending interrupts
 150          */
 151         clps_writel(0, COEOI);
 152         clps_writel(0, TC1EOI);
 153         clps_writel(0, TC2EOI);
 154         clps_writel(0, RTCEOI);
 155         clps_writel(0, TEOI);
 156         clps_writel(0, UMSEOI);
 157         clps_writel(0, SYNCIO);
 158         clps_writel(0, KBDEOI);
 159 }
 160
 161 /*
 162  * gettimeoffset() returns time since last timer tick, in usecs.
 163  *
 164  * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
 165  * 'tick' is usecs per jiffy.
 166  */
 167 static unsigned long clps711x_gettimeoffset(void)
 168 {
 169         unsigned long hwticks;
 170         hwticks = LATCH - (clps_readl(TC2D) & 0xffff);  /* since last underflow */
 171         return (hwticks * (tick_nsec / 1000)) / LATCH;
 172 }
 173
 174 /*
 175  * IRQ handler for the timer
 176  */
 177 static irqreturn_t p720t_timer_interrupt(int irq, void *dev_id)
 178 {
 179         timer_tick();
 180         return IRQ_HANDLED;
 181 }
 182
 183 static struct irqaction clps711x_timer_irq = {
 184         .name           = "CLPS711x Timer Tick",
 185         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 186         .handler        = p720t_timer_interrupt,
 187 };
 188
 189 static void __init clps711x_timer_init(void)
 190 {
 191         struct timespec tv;
 192         unsigned int syscon;
 193
 194         syscon = clps_readl(SYSCON1);
 195         syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
 196         clps_writel(syscon, SYSCON1);
 197
 198         clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
 199
 200         setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
 201
 202         tv.tv_nsec = 0;
 203         tv.tv_sec = clps_readl(RTCDR);
 204         do_settimeofday(&tv);
 205 }
 206
 207 struct sys_timer clps711x_timer = {
 208         .init           = clps711x_timer_init,
 209         .offset         = clps711x_gettimeoffset,
 210 };
 211
 212 void clps711x_restart(char mode, const char *cmd)
 213 {
 214         soft_restart(0);
 215 }
 216
 217 static void clps711x_idle(void)
 218 {
 219         clps_writel(1, HALT);
 220         __asm__ __volatile__(
 221         "mov    r0, r0\n\
 222         mov     r0, r0");
 223 }
 224
 225 static int __init clps711x_idle_init(void)
 226 {
 227         arm_pm_idle = clps711x_idle;
 228         return 0;
 229 }
 230
 231 arch_initcall(clps711x_idle_init);