aa01d6753d6ed6bb293b15a6fb40b6755fde3a3b
[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
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 irqchip 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, do_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, struct pt_regs *regs)
131 {
132         /* TODO: Check timer accuracy */
133         write_seqlock(&xtime_lock);
134
135         timer_tick(regs);
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          = SA_INTERRUPT | SA_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