arch/arm/mach-aaec2000/core.c

   1 /*
   2  *  linux/arch/arm/mach-aaec2000/core.c
   3  *
   4  *  Code common to all AAEC-2000 machines
   5  *
   6  *  Copyright (c) 2005 Nicolas Bellido Y Ortega
   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 version 2 as
  10  *  published by the Free Software Foundation.
  11  */
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/list.h>
  17 #include <linux/errno.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/timex.h>
  21 #include <linux/signal.h>
  22 #include <linux/clk.h>
  23 #include <linux/gfp.h>
  24
  25 #include <mach/hardware.h>
  26 #include <asm/irq.h>
  27 #include <asm/sizes.h>
  28
  29 #include <asm/mach/flash.h>
  30 #include <asm/mach/irq.h>
  31 #include <asm/mach/time.h>
  32 #include <asm/mach/map.h>
  33
  34 #include "core.h"
  35
  36 /*
  37  * Common I/O mapping:
  38  *
  39  * Static virtual address mappings are as follow:
  40  *
  41  * 0xf8000000-0xf8001ffff: Devices connected to APB bus
  42  * 0xf8002000-0xf8003ffff: Devices connected to AHB bus
  43  *
  44  * Below 0xe8000000 is reserved for vm allocation.
  45  *
  46  * The machine specific code must provide the extra mapping beside the
  47  * default mapping provided here.
  48  */
  49 static struct map_desc standard_io_desc[] __initdata = {
  50         {
  51                 .virtual        = VIO_APB_BASE,
  52                 .pfn            = __phys_to_pfn(PIO_APB_BASE),
  53                 .length         = IO_APB_LENGTH,
  54                 .type           = MT_DEVICE
  55         }, {
  56                 .virtual        = VIO_AHB_BASE,
  57                 .pfn            = __phys_to_pfn(PIO_AHB_BASE),
  58                 .length         = IO_AHB_LENGTH,
  59                 .type           = MT_DEVICE
  60         }
  61 };
  62
  63 void __init aaec2000_map_io(void)
  64 {
  65         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
  66 }
  67
  68 /*
  69  * Interrupt handling routines
  70  */
  71 static void aaec2000_int_ack(struct irq_data *d)
  72 {
  73         IRQ_INTSR = 1 << d->irq;
  74 }
  75
  76 static void aaec2000_int_mask(struct irq_data *d)
  77 {
  78         IRQ_INTENC |= (1 << d->irq);
  79 }
  80
  81 static void aaec2000_int_unmask(struct irq_data *d)
  82 {
  83         IRQ_INTENS |= (1 << d->irq);
  84 }
  85
  86 static struct irq_chip aaec2000_irq_chip = {
  87         .irq_ack        = aaec2000_int_ack,
  88         .irq_mask       = aaec2000_int_mask,
  89         .irq_unmask     = aaec2000_int_unmask,
  90 };
  91
  92 void __init aaec2000_init_irq(void)
  93 {
  94         unsigned int i;
  95
  96         for (i = 0; i < NR_IRQS; i++) {
  97                 set_irq_handler(i, handle_level_irq);
  98                 set_irq_chip(i, &aaec2000_irq_chip);
  99                 set_irq_flags(i, IRQF_VALID);
 100         }
 101
 102         /* Disable all interrupts */
 103         IRQ_INTENC = 0xffffffff;
 104
 105         /* Clear any pending interrupts */
 106         IRQ_INTSR = IRQ_INTSR;
 107 }
 108
 109 /*
 110  * Time keeping
 111  */
 112 /* IRQs are disabled before entering here from do_gettimeofday() */
 113 static unsigned long aaec2000_gettimeoffset(void)
 114 {
 115         unsigned long ticks_to_match, elapsed, usec;
 116
 117         /* Get ticks before next timer match */
 118         ticks_to_match = TIMER1_LOAD - TIMER1_VAL;
 119
 120         /* We need elapsed ticks since last match */
 121         elapsed = LATCH - ticks_to_match;
 122
 123         /* Now, convert them to usec */
 124         usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
 125
 126         return usec;
 127 }
 128
 129 /* We enter here with IRQs enabled */
 130 static irqreturn_t
 131 aaec2000_timer_interrupt(int irq, void *dev_id)
 132 {
 133         /* TODO: Check timer accuracy */
 134         timer_tick();
 135         TIMER1_CLEAR = 1;
 136
 137         return IRQ_HANDLED;
 138 }
 139
 140 static struct irqaction aaec2000_timer_irq = {
 141         .name           = "AAEC-2000 Timer Tick",
 142         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 143         .handler        = aaec2000_timer_interrupt,
 144 };
 145
 146 static void __init aaec2000_timer_init(void)
 147 {
 148         /* Disable timer 1 */
 149         TIMER1_CTRL = 0;
 150
 151         /* We have somehow to generate a 100Hz clock.
 152          * We then use the 508KHz timer in periodic mode.
 153          */
 154         TIMER1_LOAD = LATCH;
 155         TIMER1_CLEAR = 1; /* Clear interrupt */
 156
 157         setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
 158
 159         TIMER1_CTRL = TIMER_CTRL_ENABLE |
 160                         TIMER_CTRL_PERIODIC |
 161                         TIMER_CTRL_CLKSEL_508K;
 162 }
 163
 164 struct sys_timer aaec2000_timer = {
 165         .init           = aaec2000_timer_init,
 166         .offset         = aaec2000_gettimeoffset,
 167 };
 168
 169 static struct clcd_panel mach_clcd_panel;
 170
 171 static int aaec2000_clcd_setup(struct clcd_fb *fb)
 172 {
 173         dma_addr_t dma;
 174
 175         fb->panel = &mach_clcd_panel;
 176
 177         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
 178                         &dma, GFP_KERNEL);
 179
 180         if (!fb->fb.screen_base) {
 181                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 182                 return -ENOMEM;
 183         }
 184
 185         fb->fb.fix.smem_start = dma;
 186         fb->fb.fix.smem_len = SZ_1M;
 187
 188         return 0;
 189 }
 190
 191 static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 192 {
 193         return dma_mmap_writecombine(&fb->dev->dev, vma,
 194                         fb->fb.screen_base,
 195                         fb->fb.fix.smem_start,
 196                         fb->fb.fix.smem_len);
 197 }
 198
 199 static void aaec2000_clcd_remove(struct clcd_fb *fb)
 200 {
 201         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 202                         fb->fb.screen_base, fb->fb.fix.smem_start);
 203 }
 204
 205 static struct clcd_board clcd_plat_data = {
 206         .name   = "AAEC-2000",
 207         .check  = clcdfb_check,
 208         .decode = clcdfb_decode,
 209         .setup  = aaec2000_clcd_setup,
 210         .mmap   = aaec2000_clcd_mmap,
 211         .remove = aaec2000_clcd_remove,
 212 };
 213
 214 static struct amba_device clcd_device = {
 215         .dev            = {
 216                 .init_name              = "mb:16",
 217                 .coherent_dma_mask      = ~0,
 218                 .platform_data          = &clcd_plat_data,
 219         },
 220         .res            = {
 221                 .start                  = AAEC_CLCD_PHYS,
 222                 .end                    = AAEC_CLCD_PHYS + SZ_4K - 1,
 223                 .flags                  = IORESOURCE_MEM,
 224         },
 225         .irq            = { INT_LCD, NO_IRQ },
 226         .periphid       = 0x41110,
 227 };
 228
 229 static struct amba_device *amba_devs[] __initdata = {
 230         &clcd_device,
 231 };
 232
 233 void clk_disable(struct clk *clk)
 234 {
 235 }
 236
 237 int clk_set_rate(struct clk *clk, unsigned long rate)
 238 {
 239         return 0;
 240 }
 241
 242 int clk_enable(struct clk *clk)
 243 {
 244         return 0;
 245 }
 246
 247 struct clk *clk_get(struct device *dev, const char *id)
 248 {
 249         return dev && strcmp(dev_name(dev), "mb:16") == 0 ? NULL : ERR_PTR(-ENOENT);
 250 }
 251
 252 void clk_put(struct clk *clk)
 253 {
 254 }
 255
 256 void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
 257 {
 258         clcd_plat_data.enable = clcd->enable;
 259         clcd_plat_data.disable = clcd->disable;
 260         memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
 261 }
 262
 263 static struct flash_platform_data aaec2000_flash_data = {
 264         .map_name       = "cfi_probe",
 265         .width          = 4,
 266 };
 267
 268 static struct resource aaec2000_flash_resource = {
 269         .start          = AAEC_FLASH_BASE,
 270         .end            = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
 271         .flags          = IORESOURCE_MEM,
 272 };
 273
 274 static struct platform_device aaec2000_flash_device = {
 275         .name           = "armflash",
 276         .id             = 0,
 277         .dev            = {
 278                 .platform_data  = &aaec2000_flash_data,
 279         },
 280         .num_resources  = 1,
 281         .resource       = &aaec2000_flash_resource,
 282 };
 283
 284 static int __init aaec2000_init(void)
 285 {
 286         int i;
 287
 288         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 289                 struct amba_device *d = amba_devs[i];
 290                 amba_device_register(d, &iomem_resource);
 291         }
 292
 293         platform_device_register(&aaec2000_flash_device);
 294
 295         return 0;
 296 };
 297 arch_initcall(aaec2000_init);
 298