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   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
  23 #include <asm/hardware.h>
  24 #include <asm/irq.h>
  25 #include <asm/sizes.h>
  26
  27 #include <asm/mach/flash.h>
  28 #include <asm/mach/irq.h>
  29 #include <asm/mach/time.h>
  30 #include <asm/mach/map.h>
  31
  32 #include "core.h"
  33 #include "clock.h"
  34
  35 /*
  36  * Common I/O mapping:
  37  *
  38  * Static virtual address mappings are as follow:
  39  *
  40  * 0xf8000000-0xf8001ffff: Devices connected to APB bus
  41  * 0xf8002000-0xf8003ffff: Devices connected to AHB bus
  42  *
  43  * Below 0xe8000000 is reserved for vm allocation.
  44  *
  45  * The machine specific code must provide the extra mapping beside the
  46  * default mapping provided here.
  47  */
  48 static struct map_desc standard_io_desc[] __initdata = {
  49         {
  50                 .virtual        = VIO_APB_BASE,
  51                 .pfn            = __phys_to_pfn(PIO_APB_BASE),
  52                 .length         = IO_APB_LENGTH,
  53                 .type           = MT_DEVICE
  54         }, {
  55                 .virtual        = VIO_AHB_BASE,
  56                 .pfn            = __phys_to_pfn(PIO_AHB_BASE),
  57                 .length         = IO_AHB_LENGTH,
  58                 .type           = MT_DEVICE
  59         }
  60 };
  61
  62 void __init aaec2000_map_io(void)
  63 {
  64         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
  65 }
  66
  67 /*
  68  * Interrupt handling routines
  69  */
  70 static void aaec2000_int_ack(unsigned int irq)
  71 {
  72         IRQ_INTSR = 1 << irq;
  73 }
  74
  75 static void aaec2000_int_mask(unsigned int irq)
  76 {
  77         IRQ_INTENC |= (1 << irq);
  78 }
  79
  80 static void aaec2000_int_unmask(unsigned int irq)
  81 {
  82         IRQ_INTENS |= (1 << irq);
  83 }
  84
  85 static struct irq_chip aaec2000_irq_chip = {
  86         .ack    = aaec2000_int_ack,
  87         .mask   = aaec2000_int_mask,
  88         .unmask = aaec2000_int_unmask,
  89 };
  90
  91 void __init aaec2000_init_irq(void)
  92 {
  93         unsigned int i;
  94
  95         for (i = 0; i < NR_IRQS; i++) {
  96                 set_irq_handler(i, handle_level_irq);
  97                 set_irq_chip(i, &aaec2000_irq_chip);
  98                 set_irq_flags(i, IRQF_VALID);
  99         }
 100
 101         /* Disable all interrupts */
 102         IRQ_INTENC = 0xffffffff;
 103
 104         /* Clear any pending interrupts */
 105         IRQ_INTSR = IRQ_INTSR;
 106 }
 107
 108 /*
 109  * Time keeping
 110  */
 111 /* IRQs are disabled before entering here from do_gettimeofday() */
 112 static unsigned long aaec2000_gettimeoffset(void)
 113 {
 114         unsigned long ticks_to_match, elapsed, usec;
 115
 116         /* Get ticks before next timer match */
 117         ticks_to_match = TIMER1_LOAD - TIMER1_VAL;
 118
 119         /* We need elapsed ticks since last match */
 120         elapsed = LATCH - ticks_to_match;
 121
 122         /* Now, convert them to usec */
 123         usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
 124
 125         return usec;
 126 }
 127
 128 /* We enter here with IRQs enabled */
 129 static irqreturn_t
 130 aaec2000_timer_interrupt(int irq, void *dev_id)
 131 {
 132         /* TODO: Check timer accuracy */
 133         write_seqlock(&xtime_lock);
 134
 135         timer_tick();
 136         TIMER1_CLEAR = 1;
 137
 138         write_sequnlock(&xtime_lock);
 139
 140         return IRQ_HANDLED;
 141 }
 142
 143 static struct irqaction aaec2000_timer_irq = {
 144         .name           = "AAEC-2000 Timer Tick",
 145         .flags          = IRQF_DISABLED | IRQF_TIMER,
 146         .handler        = aaec2000_timer_interrupt,
 147 };
 148
 149 static void __init aaec2000_timer_init(void)
 150 {
 151         /* Disable timer 1 */
 152         TIMER1_CTRL = 0;
 153
 154         /* We have somehow to generate a 100Hz clock.
 155          * We then use the 508KHz timer in periodic mode.
 156          */
 157         TIMER1_LOAD = LATCH;
 158         TIMER1_CLEAR = 1; /* Clear interrupt */
 159
 160         setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
 161
 162         TIMER1_CTRL = TIMER_CTRL_ENABLE |
 163                         TIMER_CTRL_PERIODIC |
 164                         TIMER_CTRL_CLKSEL_508K;
 165 }
 166
 167 struct sys_timer aaec2000_timer = {
 168         .init           = aaec2000_timer_init,
 169         .offset         = aaec2000_gettimeoffset,
 170 };
 171
 172 static struct clcd_panel mach_clcd_panel;
 173
 174 static int aaec2000_clcd_setup(struct clcd_fb *fb)
 175 {
 176         dma_addr_t dma;
 177
 178         fb->panel = &mach_clcd_panel;
 179
 180         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
 181                         &dma, GFP_KERNEL);
 182
 183         if (!fb->fb.screen_base) {
 184                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 185                 return -ENOMEM;
 186         }
 187
 188         fb->fb.fix.smem_start = dma;
 189         fb->fb.fix.smem_len = SZ_1M;
 190
 191         return 0;
 192 }
 193
 194 static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 195 {
 196         return dma_mmap_writecombine(&fb->dev->dev, vma,
 197                         fb->fb.screen_base,
 198                         fb->fb.fix.smem_start,
 199                         fb->fb.fix.smem_len);
 200 }
 201
 202 static void aaec2000_clcd_remove(struct clcd_fb *fb)
 203 {
 204         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 205                         fb->fb.screen_base, fb->fb.fix.smem_start);
 206 }
 207
 208 static struct clcd_board clcd_plat_data = {
 209         .name   = "AAEC-2000",
 210         .check  = clcdfb_check,
 211         .decode = clcdfb_decode,
 212         .setup  = aaec2000_clcd_setup,
 213         .mmap   = aaec2000_clcd_mmap,
 214         .remove = aaec2000_clcd_remove,
 215 };
 216
 217 static struct amba_device clcd_device = {
 218         .dev            = {
 219                 .bus_id                 = "mb:16",
 220                 .coherent_dma_mask      = ~0,
 221                 .platform_data          = &clcd_plat_data,
 222         },
 223         .res            = {
 224                 .start                  = AAEC_CLCD_PHYS,
 225                 .end                    = AAEC_CLCD_PHYS + SZ_4K - 1,
 226                 .flags                  = IORESOURCE_MEM,
 227         },
 228         .irq            = { INT_LCD, NO_IRQ },
 229         .periphid       = 0x41110,
 230 };
 231
 232 static struct amba_device *amba_devs[] __initdata = {
 233         &clcd_device,
 234 };
 235
 236 static struct clk aaec2000_clcd_clk = {
 237         .name = "CLCDCLK",
 238 };
 239
 240 void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
 241 {
 242         clcd_plat_data.enable = clcd->enable;
 243         clcd_plat_data.disable = clcd->disable;
 244         memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
 245 }
 246
 247 static struct flash_platform_data aaec2000_flash_data = {
 248         .map_name       = "cfi_probe",
 249         .width          = 4,
 250 };
 251
 252 static struct resource aaec2000_flash_resource = {
 253         .start          = AAEC_FLASH_BASE,
 254         .end            = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
 255         .flags          = IORESOURCE_MEM,
 256 };
 257
 258 static struct platform_device aaec2000_flash_device = {
 259         .name           = "armflash",
 260         .id             = 0,
 261         .dev            = {
 262                 .platform_data  = &aaec2000_flash_data,
 263         },
 264         .num_resources  = 1,
 265         .resource       = &aaec2000_flash_resource,
 266 };
 267
 268 static int __init aaec2000_init(void)
 269 {
 270         int i;
 271
 272         clk_register(&aaec2000_clcd_clk);
 273
 274         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 275                 struct amba_device *d = amba_devs[i];
 276                 amba_device_register(d, &iomem_resource);
 277         }
 278
 279         platform_device_register(&aaec2000_flash_device);
 280
 281         return 0;
 282 };
 283 arch_initcall(aaec2000_init);
 284