arch/arm/mach-h720x/common.c

   1 /*
   2  * linux/arch/arm/mach-h720x/common.c
   3  *
   4  * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
   5  *               2003 Robert Schwebel <r.schwebel@pengutronix.de>
   6  *               2004 Sascha Hauer    <s.hauer@pengutronix.de>
   7  *
   8  * common stuff for Hynix h720x processors
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/sched.h>
  17 #include <linux/mman.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21
  22 #include <asm/page.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/dma.h>
  25 #include <mach/hardware.h>
  26 #include <asm/irq.h>
  27 #include <asm/mach/irq.h>
  28 #include <asm/mach/map.h>
  29 #include <mach/irqs.h>
  30
  31 #include <asm/mach/dma.h>
  32
  33 #if 0
  34 #define IRQDBG(args...) printk(args)
  35 #else
  36 #define IRQDBG(args...) do {} while(0)
  37 #endif
  38
  39 void __init arch_dma_init(dma_t *dma)
  40 {
  41 }
  42
  43 /*
  44  * Return usecs since last timer reload
  45  * (timercount * (usecs perjiffie)) / (ticks per jiffie)
  46  */
  47 unsigned long h720x_gettimeoffset(void)
  48 {
  49         return (CPU_REG (TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH;
  50 }
  51
  52 /*
  53  * mask Global irq's
  54  */
  55 static void mask_global_irq(struct irq_data *d)
  56 {
  57         CPU_REG (IRQC_VIRT, IRQC_IER) &= ~(1 << d->irq);
  58 }
  59
  60 /*
  61  * unmask Global irq's
  62  */
  63 static void unmask_global_irq(struct irq_data *d)
  64 {
  65         CPU_REG (IRQC_VIRT, IRQC_IER) |= (1 << d->irq);
  66 }
  67
  68
  69 /*
  70  * ack GPIO irq's
  71  * Ack only for edge triggered int's valid
  72  */
  73 static void inline ack_gpio_irq(struct irq_data *d)
  74 {
  75         u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(d->irq));
  76         u32 bit = IRQ_TO_BIT(d->irq);
  77         if ( (CPU_REG (reg_base, GPIO_EDGE) & bit))
  78                 CPU_REG (reg_base, GPIO_CLR) = bit;
  79 }
  80
  81 /*
  82  * mask GPIO irq's
  83  */
  84 static void inline mask_gpio_irq(struct irq_data *d)
  85 {
  86         u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(d->irq));
  87         u32 bit = IRQ_TO_BIT(d->irq);
  88         CPU_REG (reg_base, GPIO_MASK) &= ~bit;
  89 }
  90
  91 /*
  92  * unmask GPIO irq's
  93  */
  94 static void inline unmask_gpio_irq(struct irq_data *d)
  95 {
  96         u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(d->irq));
  97         u32 bit = IRQ_TO_BIT(d->irq);
  98         CPU_REG (reg_base, GPIO_MASK) |= bit;
  99 }
 100
 101 static void
 102 h720x_gpio_handler(unsigned int mask, unsigned int irq,
 103                  struct irq_desc *desc)
 104 {
 105         IRQDBG("%s irq: %d\n", __func__, irq);
 106         while (mask) {
 107                 if (mask & 1) {
 108                         IRQDBG("handling irq %d\n", irq);
 109                         generic_handle_irq(irq);
 110                 }
 111                 irq++;
 112                 mask >>= 1;
 113         }
 114 }
 115
 116 static void
 117 h720x_gpioa_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
 118 {
 119         unsigned int mask, irq;
 120
 121         mask = CPU_REG(GPIO_A_VIRT,GPIO_STAT);
 122         irq = IRQ_CHAINED_GPIOA(0);
 123         IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
 124         h720x_gpio_handler(mask, irq, desc);
 125 }
 126
 127 static void
 128 h720x_gpiob_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
 129 {
 130         unsigned int mask, irq;
 131         mask = CPU_REG(GPIO_B_VIRT,GPIO_STAT);
 132         irq = IRQ_CHAINED_GPIOB(0);
 133         IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
 134         h720x_gpio_handler(mask, irq, desc);
 135 }
 136
 137 static void
 138 h720x_gpioc_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
 139 {
 140         unsigned int mask, irq;
 141
 142         mask = CPU_REG(GPIO_C_VIRT,GPIO_STAT);
 143         irq = IRQ_CHAINED_GPIOC(0);
 144         IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
 145         h720x_gpio_handler(mask, irq, desc);
 146 }
 147
 148 static void
 149 h720x_gpiod_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
 150 {
 151         unsigned int mask, irq;
 152
 153         mask = CPU_REG(GPIO_D_VIRT,GPIO_STAT);
 154         irq = IRQ_CHAINED_GPIOD(0);
 155         IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
 156         h720x_gpio_handler(mask, irq, desc);
 157 }
 158
 159 #ifdef CONFIG_CPU_H7202
 160 static void
 161 h720x_gpioe_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
 162 {
 163         unsigned int mask, irq;
 164
 165         mask = CPU_REG(GPIO_E_VIRT,GPIO_STAT);
 166         irq = IRQ_CHAINED_GPIOE(0);
 167         IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
 168         h720x_gpio_handler(mask, irq, desc);
 169 }
 170 #endif
 171
 172 static struct irq_chip h720x_global_chip = {
 173         .irq_ack = mask_global_irq,
 174         .irq_mask = mask_global_irq,
 175         .irq_unmask = unmask_global_irq,
 176 };
 177
 178 static struct irq_chip h720x_gpio_chip = {
 179         .irq_ack = ack_gpio_irq,
 180         .irq_mask = mask_gpio_irq,
 181         .irq_unmask = unmask_gpio_irq,
 182 };
 183
 184 /*
 185  * Initialize IRQ's, mask all, enable multiplexed irq's
 186  */
 187 void __init h720x_init_irq (void)
 188 {
 189         int     irq;
 190
 191         /* Mask global irq's */
 192         CPU_REG (IRQC_VIRT, IRQC_IER) = 0x0;
 193
 194         /* Mask all multiplexed irq's */
 195         CPU_REG (GPIO_A_VIRT, GPIO_MASK) = 0x0;
 196         CPU_REG (GPIO_B_VIRT, GPIO_MASK) = 0x0;
 197         CPU_REG (GPIO_C_VIRT, GPIO_MASK) = 0x0;
 198         CPU_REG (GPIO_D_VIRT, GPIO_MASK) = 0x0;
 199
 200         /* Initialize global IRQ's, fast path */
 201         for (irq = 0; irq < NR_GLBL_IRQS; irq++) {
 202                 irq_set_chip_and_handler(irq, &h720x_global_chip,
 203                                          handle_level_irq);
 204                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 205         }
 206
 207         /* Initialize multiplexed IRQ's, slow path */
 208         for (irq = IRQ_CHAINED_GPIOA(0) ; irq <= IRQ_CHAINED_GPIOD(31); irq++) {
 209                 irq_set_chip_and_handler(irq, &h720x_gpio_chip,
 210                                          handle_edge_irq);
 211                 set_irq_flags(irq, IRQF_VALID );
 212         }
 213         irq_set_chained_handler(IRQ_GPIOA, h720x_gpioa_demux_handler);
 214         irq_set_chained_handler(IRQ_GPIOB, h720x_gpiob_demux_handler);
 215         irq_set_chained_handler(IRQ_GPIOC, h720x_gpioc_demux_handler);
 216         irq_set_chained_handler(IRQ_GPIOD, h720x_gpiod_demux_handler);
 217
 218 #ifdef CONFIG_CPU_H7202
 219         for (irq = IRQ_CHAINED_GPIOE(0) ; irq <= IRQ_CHAINED_GPIOE(31); irq++) {
 220                 irq_set_chip_and_handler(irq, &h720x_gpio_chip,
 221                                          handle_edge_irq);
 222                 set_irq_flags(irq, IRQF_VALID );
 223         }
 224         irq_set_chained_handler(IRQ_GPIOE, h720x_gpioe_demux_handler);
 225 #endif
 226
 227         /* Enable multiplexed irq's */
 228         CPU_REG (IRQC_VIRT, IRQC_IER) = IRQ_ENA_MUX;
 229 }
 230
 231 static struct map_desc h720x_io_desc[] __initdata = {
 232         {
 233                 .virtual        = IO_VIRT,
 234                 .pfn            = __phys_to_pfn(IO_PHYS),
 235                 .length         = IO_SIZE,
 236                 .type           = MT_DEVICE
 237         },
 238 };
 239
 240 /* Initialize io tables */
 241 void __init h720x_map_io(void)
 242 {
 243         iotable_init(h720x_io_desc,ARRAY_SIZE(h720x_io_desc));
 244 }