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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/config.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/timex.h>
  22 #include <linux/signal.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/irq.h>
  26 #include <asm/sizes.h>
  27 #include <asm/hardware/amba.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 #include "clock.h"
  36
  37 /*
  38  * Common I/O mapping:
  39  *
  40  * Static virtual address mappings are as follow:
  41  *
  42  * 0xf8000000-0xf8001ffff: Devices connected to APB bus
  43  * 0xf8002000-0xf8003ffff: Devices connected to AHB bus
  44  *
  45  * Below 0xe8000000 is reserved for vm allocation.
  46  *
  47  * The machine specific code must provide the extra mapping beside the
  48  * default mapping provided here.
  49  */
  50 static struct map_desc standard_io_desc[] __initdata = {
  51         {
  52                 .virtual        = VIO_APB_BASE,
  53                 .physical       = __phys_to_pfn(PIO_APB_BASE),
  54                 .length         = IO_APB_LENGTH,
  55                 .type           = MT_DEVICE
  56         }, {
  57                 .virtual        = VIO_AHB_BASE,
  58                 .physical       = __phys_to_pfn(PIO_AHB_BASE),
  59                 .length         = IO_AHB_LENGTH,
  60                 .type           = MT_DEVICE
  61         }
  62 };
  63
  64 void __init aaec2000_map_io(void)
  65 {
  66         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
  67 }
  68
  69 /*
  70  * Interrupt handling routines
  71  */
  72 static void aaec2000_int_ack(unsigned int irq)
  73 {
  74         IRQ_INTSR = 1 << irq;
  75 }
  76
  77 static void aaec2000_int_mask(unsigned int irq)
  78 {
  79         IRQ_INTENC |= (1 << irq);
  80 }
  81
  82 static void aaec2000_int_unmask(unsigned int irq)
  83 {
  84         IRQ_INTENS |= (1 << irq);
  85 }
  86
  87 static struct irqchip aaec2000_irq_chip = {
  88         .ack    = aaec2000_int_ack,
  89         .mask   = aaec2000_int_mask,
  90         .unmask = aaec2000_int_unmask,
  91 };
  92
  93 void __init aaec2000_init_irq(void)
  94 {
  95         unsigned int i;
  96
  97         for (i = 0; i < NR_IRQS; i++) {
  98                 set_irq_handler(i, do_level_IRQ);
  99                 set_irq_chip(i, &aaec2000_irq_chip);
 100                 set_irq_flags(i, IRQF_VALID);
 101         }
 102
 103         /* Disable all interrupts */
 104         IRQ_INTENC = 0xffffffff;
 105
 106         /* Clear any pending interrupts */
 107         IRQ_INTSR = IRQ_INTSR;
 108 }
 109
 110 /*
 111  * Time keeping
 112  */
 113 /* IRQs are disabled before entering here from do_gettimeofday() */
 114 static unsigned long aaec2000_gettimeoffset(void)
 115 {
 116         unsigned long ticks_to_match, elapsed, usec;
 117
 118         /* Get ticks before next timer match */
 119         ticks_to_match = TIMER1_LOAD - TIMER1_VAL;
 120
 121         /* We need elapsed ticks since last match */
 122         elapsed = LATCH - ticks_to_match;
 123
 124         /* Now, convert them to usec */
 125         usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
 126
 127         return usec;
 128 }
 129
 130 /* We enter here with IRQs enabled */
 131 static irqreturn_t
 132 aaec2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 133 {
 134         /* TODO: Check timer accuracy */
 135         write_seqlock(&xtime_lock);
 136
 137         timer_tick(regs);
 138         TIMER1_CLEAR = 1;
 139
 140         write_sequnlock(&xtime_lock);
 141
 142         return IRQ_HANDLED;
 143 }
 144
 145 static struct irqaction aaec2000_timer_irq = {
 146         .name           = "AAEC-2000 Timer Tick",
 147         .flags          = SA_INTERRUPT | SA_TIMER,
 148         .handler        = aaec2000_timer_interrupt,
 149 };
 150
 151 static void __init aaec2000_timer_init(void)
 152 {
 153         /* Disable timer 1 */
 154         TIMER1_CTRL = 0;
 155
 156         /* We have somehow to generate a 100Hz clock.
 157          * We then use the 508KHz timer in periodic mode.
 158          */
 159         TIMER1_LOAD = LATCH;
 160         TIMER1_CLEAR = 1; /* Clear interrupt */
 161
 162         setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
 163
 164         TIMER1_CTRL = TIMER_CTRL_ENABLE |
 165                         TIMER_CTRL_PERIODIC |
 166                         TIMER_CTRL_CLKSEL_508K;
 167 }
 168
 169 struct sys_timer aaec2000_timer = {
 170         .init           = aaec2000_timer_init,
 171         .offset         = aaec2000_gettimeoffset,
 172 };
 173
 174 static struct clcd_panel mach_clcd_panel;
 175
 176 static int aaec2000_clcd_setup(struct clcd_fb *fb)
 177 {
 178         dma_addr_t dma;
 179
 180         fb->panel = &mach_clcd_panel;
 181
 182         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
 183                         &dma, GFP_KERNEL);
 184
 185         if (!fb->fb.screen_base) {
 186                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 187                 return -ENOMEM;
 188         }
 189
 190         fb->fb.fix.smem_start = dma;
 191         fb->fb.fix.smem_len = SZ_1M;
 192
 193         return 0;
 194 }
 195
 196 static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 197 {
 198         return dma_mmap_writecombine(&fb->dev->dev, vma,
 199                         fb->fb.screen_base,
 200                         fb->fb.fix.smem_start,
 201                         fb->fb.fix.smem_len);
 202 }
 203
 204 static void aaec2000_clcd_remove(struct clcd_fb *fb)
 205 {
 206         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 207                         fb->fb.screen_base, fb->fb.fix.smem_start);
 208 }
 209
 210 static struct clcd_board clcd_plat_data = {
 211         .name   = "AAEC-2000",
 212         .check  = clcdfb_check,
 213         .decode = clcdfb_decode,
 214         .setup  = aaec2000_clcd_setup,
 215         .mmap   = aaec2000_clcd_mmap,
 216         .remove = aaec2000_clcd_remove,
 217 };
 218
 219 static struct amba_device clcd_device = {
 220         .dev            = {
 221                 .bus_id                 = "mb:16",
 222                 .coherent_dma_mask      = ~0,
 223                 .platform_data          = &clcd_plat_data,
 224         },
 225         .res            = {
 226                 .start                  = AAEC_CLCD_PHYS,
 227                 .end                    = AAEC_CLCD_PHYS + SZ_4K - 1,
 228                 .flags                  = IORESOURCE_MEM,
 229         },
 230         .irq            = { INT_LCD, NO_IRQ },
 231         .periphid       = 0x41110,
 232 };
 233
 234 static struct amba_device *amba_devs[] __initdata = {
 235         &clcd_device,
 236 };
 237
 238 static struct clk aaec2000_clcd_clk = {
 239         .name = "CLCDCLK",
 240 };
 241
 242 void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
 243 {
 244         clcd_plat_data.enable = clcd->enable;
 245         clcd_plat_data.disable = clcd->disable;
 246         memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
 247 }
 248
 249 static struct flash_platform_data aaec2000_flash_data = {
 250         .map_name       = "cfi_probe",
 251         .width          = 4,
 252 };
 253
 254 static struct resource aaec2000_flash_resource = {
 255         .start          = AAEC_FLASH_BASE,
 256         .end            = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
 257         .flags          = IORESOURCE_MEM,
 258 };
 259
 260 static struct platform_device aaec2000_flash_device = {
 261         .name           = "armflash",
 262         .id             = 0,
 263         .dev            = {
 264                 .platform_data  = &aaec2000_flash_data,
 265         },
 266         .num_resources  = 1,
 267         .resource       = &aaec2000_flash_resource,
 268 };
 269
 270 static int __init aaec2000_init(void)
 271 {
 272         int i;
 273
 274         clk_register(&aaec2000_clcd_clk);
 275
 276         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 277                 struct amba_device *d = amba_devs[i];
 278                 amba_device_register(d, &iomem_resource);
 279         }
 280
 281         platform_device_register(&aaec2000_flash_device);
 282
 283         return 0;
 284 };
 285 arch_initcall(aaec2000_init);
 286