Merge branch 'linus' into sched/core
[linux-3.10.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 #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(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 irq_chip 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, 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