USB: Fix a bug on appledisplay.c regarding signedness
[linux-2.6.git] / 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
24 #include <mach/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
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         timer_tick();
134         TIMER1_CLEAR = 1;
135
136         return IRQ_HANDLED;
137 }
138
139 static struct irqaction aaec2000_timer_irq = {
140         .name           = "AAEC-2000 Timer Tick",
141         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
142         .handler        = aaec2000_timer_interrupt,
143 };
144
145 static void __init aaec2000_timer_init(void)
146 {
147         /* Disable timer 1 */
148         TIMER1_CTRL = 0;
149
150         /* We have somehow to generate a 100Hz clock.
151          * We then use the 508KHz timer in periodic mode.
152          */
153         TIMER1_LOAD = LATCH;
154         TIMER1_CLEAR = 1; /* Clear interrupt */
155
156         setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
157
158         TIMER1_CTRL = TIMER_CTRL_ENABLE |
159                         TIMER_CTRL_PERIODIC |
160                         TIMER_CTRL_CLKSEL_508K;
161 }
162
163 struct sys_timer aaec2000_timer = {
164         .init           = aaec2000_timer_init,
165         .offset         = aaec2000_gettimeoffset,
166 };
167
168 static struct clcd_panel mach_clcd_panel;
169
170 static int aaec2000_clcd_setup(struct clcd_fb *fb)
171 {
172         dma_addr_t dma;
173
174         fb->panel = &mach_clcd_panel;
175
176         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
177                         &dma, GFP_KERNEL);
178
179         if (!fb->fb.screen_base) {
180                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
181                 return -ENOMEM;
182         }
183
184         fb->fb.fix.smem_start = dma;
185         fb->fb.fix.smem_len = SZ_1M;
186
187         return 0;
188 }
189
190 static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
191 {
192         return dma_mmap_writecombine(&fb->dev->dev, vma,
193                         fb->fb.screen_base,
194                         fb->fb.fix.smem_start,
195                         fb->fb.fix.smem_len);
196 }
197
198 static void aaec2000_clcd_remove(struct clcd_fb *fb)
199 {
200         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
201                         fb->fb.screen_base, fb->fb.fix.smem_start);
202 }
203
204 static struct clcd_board clcd_plat_data = {
205         .name   = "AAEC-2000",
206         .check  = clcdfb_check,
207         .decode = clcdfb_decode,
208         .setup  = aaec2000_clcd_setup,
209         .mmap   = aaec2000_clcd_mmap,
210         .remove = aaec2000_clcd_remove,
211 };
212
213 static struct amba_device clcd_device = {
214         .dev            = {
215                 .init_name              = "mb:16",
216                 .coherent_dma_mask      = ~0,
217                 .platform_data          = &clcd_plat_data,
218         },
219         .res            = {
220                 .start                  = AAEC_CLCD_PHYS,
221                 .end                    = AAEC_CLCD_PHYS + SZ_4K - 1,
222                 .flags                  = IORESOURCE_MEM,
223         },
224         .irq            = { INT_LCD, NO_IRQ },
225         .periphid       = 0x41110,
226 };
227
228 static struct amba_device *amba_devs[] __initdata = {
229         &clcd_device,
230 };
231
232 void clk_disable(struct clk *clk)
233 {
234 }
235
236 int clk_set_rate(struct clk *clk, unsigned long rate)
237 {
238         return 0;
239 }
240
241 int clk_enable(struct clk *clk)
242 {
243         return 0;
244 }
245
246 struct clk *clk_get(struct device *dev, const char *id)
247 {
248         return dev && strcmp(dev_name(dev), "mb:16") == 0 ? NULL : ERR_PTR(-ENOENT);
249 }
250
251 void clk_put(struct clk *clk)
252 {
253 }
254
255 void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
256 {
257         clcd_plat_data.enable = clcd->enable;
258         clcd_plat_data.disable = clcd->disable;
259         memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
260 }
261
262 static struct flash_platform_data aaec2000_flash_data = {
263         .map_name       = "cfi_probe",
264         .width          = 4,
265 };
266
267 static struct resource aaec2000_flash_resource = {
268         .start          = AAEC_FLASH_BASE,
269         .end            = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
270         .flags          = IORESOURCE_MEM,
271 };
272
273 static struct platform_device aaec2000_flash_device = {
274         .name           = "armflash",
275         .id             = 0,
276         .dev            = {
277                 .platform_data  = &aaec2000_flash_data,
278         },
279         .num_resources  = 1,
280         .resource       = &aaec2000_flash_resource,
281 };
282
283 static int __init aaec2000_init(void)
284 {
285         int i;
286
287         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
288                 struct amba_device *d = amba_devs[i];
289                 amba_device_register(d, &iomem_resource);
290         }
291
292         platform_device_register(&aaec2000_flash_device);
293
294         return 0;
295 };
296 arch_initcall(aaec2000_init);
297