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
aaec2000_map_io(void)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 */
aaec2000_int_ack(unsigned int irq)70 static void aaec2000_int_ack(unsigned int irq)
71 {
72 IRQ_INTSR = 1 << irq;
73 }
74
aaec2000_int_mask(unsigned int irq)75 static void aaec2000_int_mask(unsigned int irq)
76 {
77 IRQ_INTENC |= (1 << irq);
78 }
79
aaec2000_int_unmask(unsigned int irq)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
aaec2000_init_irq(void)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() */
aaec2000_gettimeoffset(void)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
aaec2000_timer_interrupt(int irq,void * dev_id)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
aaec2000_timer_init(void)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
aaec2000_clcd_setup(struct clcd_fb * fb)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
aaec2000_clcd_mmap(struct clcd_fb * fb,struct vm_area_struct * vma)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
aaec2000_clcd_remove(struct clcd_fb * fb)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
clk_disable(struct clk * clk)232 void clk_disable(struct clk *clk)
233 {
234 }
235
clk_set_rate(struct clk * clk,unsigned long rate)236 int clk_set_rate(struct clk *clk, unsigned long rate)
237 {
238 return 0;
239 }
240
clk_enable(struct clk * clk)241 int clk_enable(struct clk *clk)
242 {
243 return 0;
244 }
245
clk_get(struct device * dev,const char * id)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
clk_put(struct clk * clk)251 void clk_put(struct clk *clk)
252 {
253 }
254
aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info * clcd)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
aaec2000_init(void)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
298