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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/platform_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
  28 #include <asm/mach/flash.h>
  29 #include <asm/mach/irq.h>
  30 #include <asm/mach/time.h>
  31 #include <asm/mach/map.h>
  32
  33 #include "core.h"
  34 #include "clock.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(unsigned int irq)
  72 {
  73         IRQ_INTSR = 1 << irq;
  74 }
  75
  76 static void aaec2000_int_mask(unsigned int irq)
  77 {
  78         IRQ_INTENC |= (1 << irq);
  79 }
  80
  81 static void aaec2000_int_unmask(unsigned int irq)
  82 {
  83         IRQ_INTENS |= (1 << irq);
  84 }
  85
  86 static struct irqchip aaec2000_irq_chip = {
  87         .ack    = aaec2000_int_ack,
  88         .mask   = aaec2000_int_mask,
  89         .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, do_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, struct pt_regs *regs)
 132 {
 133         /* TODO: Check timer accuracy */
 134         write_seqlock(&xtime_lock);
 135
 136         timer_tick(regs);
 137         TIMER1_CLEAR = 1;
 138
 139         write_sequnlock(&xtime_lock);
 140
 141         return IRQ_HANDLED;
 142 }
 143
 144 static struct irqaction aaec2000_timer_irq = {
 145         .name           = "AAEC-2000 Timer Tick",
 146         .flags          = SA_INTERRUPT | SA_TIMER,
 147         .handler        = aaec2000_timer_interrupt,
 148 };
 149
 150 static void __init aaec2000_timer_init(void)
 151 {
 152         /* Disable timer 1 */
 153         TIMER1_CTRL = 0;
 154
 155         /* We have somehow to generate a 100Hz clock.
 156          * We then use the 508KHz timer in periodic mode.
 157          */
 158         TIMER1_LOAD = LATCH;
 159         TIMER1_CLEAR = 1; /* Clear interrupt */
 160
 161         setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
 162
 163         TIMER1_CTRL = TIMER_CTRL_ENABLE |
 164                         TIMER_CTRL_PERIODIC |
 165                         TIMER_CTRL_CLKSEL_508K;
 166 }
 167
 168 struct sys_timer aaec2000_timer = {
 169         .init           = aaec2000_timer_init,
 170         .offset         = aaec2000_gettimeoffset,
 171 };
 172
 173 static struct clcd_panel mach_clcd_panel;
 174
 175 static int aaec2000_clcd_setup(struct clcd_fb *fb)
 176 {
 177         dma_addr_t dma;
 178
 179         fb->panel = &mach_clcd_panel;
 180
 181         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
 182                         &dma, GFP_KERNEL);
 183
 184         if (!fb->fb.screen_base) {
 185                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 186                 return -ENOMEM;
 187         }
 188
 189         fb->fb.fix.smem_start = dma;
 190         fb->fb.fix.smem_len = SZ_1M;
 191
 192         return 0;
 193 }
 194
 195 static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 196 {
 197         return dma_mmap_writecombine(&fb->dev->dev, vma,
 198                         fb->fb.screen_base,
 199                         fb->fb.fix.smem_start,
 200                         fb->fb.fix.smem_len);
 201 }
 202
 203 static void aaec2000_clcd_remove(struct clcd_fb *fb)
 204 {
 205         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 206                         fb->fb.screen_base, fb->fb.fix.smem_start);
 207 }
 208
 209 static struct clcd_board clcd_plat_data = {
 210         .name   = "AAEC-2000",
 211         .check  = clcdfb_check,
 212         .decode = clcdfb_decode,
 213         .setup  = aaec2000_clcd_setup,
 214         .mmap   = aaec2000_clcd_mmap,
 215         .remove = aaec2000_clcd_remove,
 216 };
 217
 218 static struct amba_device clcd_device = {
 219         .dev            = {
 220                 .bus_id                 = "mb:16",
 221                 .coherent_dma_mask      = ~0,
 222                 .platform_data          = &clcd_plat_data,
 223         },
 224         .res            = {
 225                 .start                  = AAEC_CLCD_PHYS,
 226                 .end                    = AAEC_CLCD_PHYS + SZ_4K - 1,
 227                 .flags                  = IORESOURCE_MEM,
 228         },
 229         .irq            = { INT_LCD, NO_IRQ },
 230         .periphid       = 0x41110,
 231 };
 232
 233 static struct amba_device *amba_devs[] __initdata = {
 234         &clcd_device,
 235 };
 236
 237 static struct clk aaec2000_clcd_clk = {
 238         .name = "CLCDCLK",
 239 };
 240
 241 void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
 242 {
 243         clcd_plat_data.enable = clcd->enable;
 244         clcd_plat_data.disable = clcd->disable;
 245         memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
 246 }
 247
 248 static struct flash_platform_data aaec2000_flash_data = {
 249         .map_name       = "cfi_probe",
 250         .width          = 4,
 251 };
 252
 253 static struct resource aaec2000_flash_resource = {
 254         .start          = AAEC_FLASH_BASE,
 255         .end            = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
 256         .flags          = IORESOURCE_MEM,
 257 };
 258
 259 static struct platform_device aaec2000_flash_device = {
 260         .name           = "armflash",
 261         .id             = 0,
 262         .dev            = {
 263                 .platform_data  = &aaec2000_flash_data,
 264         },
 265         .num_resources  = 1,
 266         .resource       = &aaec2000_flash_resource,
 267 };
 268
 269 static int __init aaec2000_init(void)
 270 {
 271         int i;
 272
 273         clk_register(&aaec2000_clcd_clk);
 274
 275         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 276                 struct amba_device *d = amba_devs[i];
 277                 amba_device_register(d, &iomem_resource);
 278         }
 279
 280         platform_device_register(&aaec2000_flash_device);
 281
 282         return 0;
 283 };
 284 arch_initcall(aaec2000_init);
 285