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[karo-tx-linux.git] / arch / arm / mach-pxa / pxa25x.c
1 /*
2  *  linux/arch/arm/mach-pxa/pxa25x.c
3  *
4  *  Author:     Nicolas Pitre
5  *  Created:    Jun 15, 2001
6  *  Copyright:  MontaVista Software Inc.
7  *
8  * Code specific to PXA21x/25x/26x variants.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * Since this file should be linked before any other machine specific file,
15  * the __initcall() here will be executed first.  This serves as default
16  * initialization stuff for PXA machines which can be overridden later if
17  * need be.
18  */
19 #include <linux/gpio.h>
20 #include <linux/gpio-pxa.h>
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/platform_device.h>
25 #include <linux/suspend.h>
26 #include <linux/syscore_ops.h>
27 #include <linux/irq.h>
28
29 #include <asm/mach/map.h>
30 #include <asm/suspend.h>
31 #include <mach/hardware.h>
32 #include <mach/irqs.h>
33 #include <mach/pxa25x.h>
34 #include <mach/reset.h>
35 #include <mach/pm.h>
36 #include <mach/dma.h>
37 #include <mach/smemc.h>
38
39 #include "generic.h"
40 #include "devices.h"
41
42 /*
43  * Various clock factors driven by the CCCR register.
44  */
45
46 #ifdef CONFIG_PM
47
48 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
49 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
50
51 /*
52  * List of global PXA peripheral registers to preserve.
53  * More ones like CP and general purpose register values are preserved
54  * with the stack pointer in sleep.S.
55  */
56 enum {
57         SLEEP_SAVE_PSTR,
58         SLEEP_SAVE_COUNT
59 };
60
61
62 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
63 {
64         SAVE(PSTR);
65 }
66
67 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
68 {
69         RESTORE(PSTR);
70 }
71
72 static void pxa25x_cpu_pm_enter(suspend_state_t state)
73 {
74         /* Clear reset status */
75         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
76
77         switch (state) {
78         case PM_SUSPEND_MEM:
79                 cpu_suspend(PWRMODE_SLEEP, pxa25x_finish_suspend);
80                 break;
81         }
82 }
83
84 static int pxa25x_cpu_pm_prepare(void)
85 {
86         /* set resume return address */
87         PSPR = virt_to_phys(cpu_resume);
88         return 0;
89 }
90
91 static void pxa25x_cpu_pm_finish(void)
92 {
93         /* ensure not to come back here if it wasn't intended */
94         PSPR = 0;
95 }
96
97 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
98         .save_count     = SLEEP_SAVE_COUNT,
99         .valid          = suspend_valid_only_mem,
100         .save           = pxa25x_cpu_pm_save,
101         .restore        = pxa25x_cpu_pm_restore,
102         .enter          = pxa25x_cpu_pm_enter,
103         .prepare        = pxa25x_cpu_pm_prepare,
104         .finish         = pxa25x_cpu_pm_finish,
105 };
106
107 static void __init pxa25x_init_pm(void)
108 {
109         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
110 }
111 #else
112 static inline void pxa25x_init_pm(void) {}
113 #endif
114
115 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
116  */
117
118 static int pxa25x_set_wake(struct irq_data *d, unsigned int on)
119 {
120         int gpio = pxa_irq_to_gpio(d->irq);
121         uint32_t mask = 0;
122
123         if (gpio >= 0 && gpio < 85)
124                 return gpio_set_wake(gpio, on);
125
126         if (d->irq == IRQ_RTCAlrm) {
127                 mask = PWER_RTC;
128                 goto set_pwer;
129         }
130
131         return -EINVAL;
132
133 set_pwer:
134         if (on)
135                 PWER |= mask;
136         else
137                 PWER &=~mask;
138
139         return 0;
140 }
141
142 void __init pxa25x_init_irq(void)
143 {
144         pxa_init_irq(32, pxa25x_set_wake);
145 }
146
147 #ifdef CONFIG_CPU_PXA26x
148 void __init pxa26x_init_irq(void)
149 {
150         pxa_init_irq(32, pxa25x_set_wake);
151 }
152 #endif
153
154 static struct map_desc pxa25x_io_desc[] __initdata = {
155         {       /* Mem Ctl */
156                 .virtual        = (unsigned long)SMEMC_VIRT,
157                 .pfn            = __phys_to_pfn(PXA2XX_SMEMC_BASE),
158                 .length         = SMEMC_SIZE,
159                 .type           = MT_DEVICE
160         }, {    /* UNCACHED_PHYS_0 */
161                 .virtual        = UNCACHED_PHYS_0,
162                 .pfn            = __phys_to_pfn(0x00000000),
163                 .length         = UNCACHED_PHYS_0_SIZE,
164                 .type           = MT_DEVICE
165         },
166 };
167
168 void __init pxa25x_map_io(void)
169 {
170         pxa_map_io();
171         iotable_init(ARRAY_AND_SIZE(pxa25x_io_desc));
172         pxa25x_get_clk_frequency_khz(1);
173 }
174
175 static struct pxa_gpio_platform_data pxa25x_gpio_info __initdata = {
176         .irq_base       = PXA_GPIO_TO_IRQ(0),
177         .gpio_set_wake  = gpio_set_wake,
178 };
179
180 static struct platform_device *pxa25x_devices[] __initdata = {
181         &pxa25x_device_udc,
182         &pxa_device_pmu,
183         &pxa_device_i2s,
184         &sa1100_device_rtc,
185         &pxa25x_device_ssp,
186         &pxa25x_device_nssp,
187         &pxa25x_device_assp,
188         &pxa25x_device_pwm0,
189         &pxa25x_device_pwm1,
190         &pxa_device_asoc_platform,
191 };
192
193 static int __init pxa25x_init(void)
194 {
195         int ret = 0;
196
197         if (cpu_is_pxa25x()) {
198
199                 reset_status = RCSR;
200
201                 if ((ret = pxa_init_dma(IRQ_DMA, 16)))
202                         return ret;
203
204                 pxa25x_init_pm();
205
206                 register_syscore_ops(&pxa_irq_syscore_ops);
207                 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
208
209                 pxa2xx_set_dmac_info(16);
210                 pxa_register_device(&pxa25x_device_gpio, &pxa25x_gpio_info);
211                 ret = platform_add_devices(pxa25x_devices,
212                                            ARRAY_SIZE(pxa25x_devices));
213                 if (ret)
214                         return ret;
215         }
216
217         return ret;
218 }
219
220 postcore_initcall(pxa25x_init);