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25af3b0f EM |
1 | /* |
2 | * SSP control code for Sharp Corgi devices | |
3 | * | |
4 | * Copyright (c) 2004-2005 Richard Purdie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/sched.h> | |
25af3b0f EM |
16 | #include <linux/delay.h> |
17 | #include <linux/platform_device.h> | |
18 | #include <mach/hardware.h> | |
19 | #include <asm/mach-types.h> | |
20 | ||
21 | #include <mach/ssp.h> | |
25af3b0f EM |
22 | #include <mach/pxa2xx-gpio.h> |
23 | #include <mach/regs-ssp.h> | |
24 | #include "sharpsl.h" | |
25 | ||
26 | static DEFINE_SPINLOCK(corgi_ssp_lock); | |
27 | static struct ssp_dev corgi_ssp_dev; | |
28 | static struct ssp_state corgi_ssp_state; | |
29 | static struct corgissp_machinfo *ssp_machinfo; | |
30 | ||
31 | /* | |
32 | * There are three devices connected to the SSP interface: | |
33 | * 1. A touchscreen controller (TI ADS7846 compatible) | |
34 | * 2. An LCD controller (with some Backlight functionality) | |
35 | * 3. A battery monitoring IC (Maxim MAX1111) | |
36 | * | |
37 | * Each device uses a different speed/mode of communication. | |
38 | * | |
39 | * The touchscreen is very sensitive and the most frequently used | |
40 | * so the port is left configured for this. | |
41 | * | |
42 | * Devices are selected using Chip Selects on GPIOs. | |
43 | */ | |
44 | ||
45 | /* | |
46 | * ADS7846 Routines | |
47 | */ | |
48 | unsigned long corgi_ssp_ads7846_putget(ulong data) | |
49 | { | |
50 | unsigned long flag; | |
51 | u32 ret = 0; | |
52 | ||
53 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
54 | if (ssp_machinfo->cs_ads7846 >= 0) | |
55 | GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
56 | ||
57 | ssp_write_word(&corgi_ssp_dev,data); | |
58 | ssp_read_word(&corgi_ssp_dev, &ret); | |
59 | ||
60 | if (ssp_machinfo->cs_ads7846 >= 0) | |
61 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
62 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | /* | |
68 | * NOTE: These functions should always be called in interrupt context | |
69 | * and use the _lock and _unlock functions. They are very time sensitive. | |
70 | */ | |
71 | void corgi_ssp_ads7846_lock(void) | |
72 | { | |
73 | spin_lock(&corgi_ssp_lock); | |
74 | if (ssp_machinfo->cs_ads7846 >= 0) | |
75 | GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
76 | } | |
77 | ||
78 | void corgi_ssp_ads7846_unlock(void) | |
79 | { | |
80 | if (ssp_machinfo->cs_ads7846 >= 0) | |
81 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
82 | spin_unlock(&corgi_ssp_lock); | |
83 | } | |
84 | ||
85 | void corgi_ssp_ads7846_put(ulong data) | |
86 | { | |
87 | ssp_write_word(&corgi_ssp_dev,data); | |
88 | } | |
89 | ||
90 | unsigned long corgi_ssp_ads7846_get(void) | |
91 | { | |
92 | u32 ret = 0; | |
93 | ssp_read_word(&corgi_ssp_dev, &ret); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | EXPORT_SYMBOL(corgi_ssp_ads7846_putget); | |
98 | EXPORT_SYMBOL(corgi_ssp_ads7846_lock); | |
99 | EXPORT_SYMBOL(corgi_ssp_ads7846_unlock); | |
100 | EXPORT_SYMBOL(corgi_ssp_ads7846_put); | |
101 | EXPORT_SYMBOL(corgi_ssp_ads7846_get); | |
102 | ||
103 | ||
104 | /* | |
105 | * LCD/Backlight Routines | |
106 | */ | |
107 | unsigned long corgi_ssp_dac_put(ulong data) | |
108 | { | |
109 | unsigned long flag, sscr1 = SSCR1_SPH; | |
110 | u32 tmp; | |
111 | ||
112 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
113 | ||
114 | if (machine_is_spitz() || machine_is_akita() || machine_is_borzoi()) | |
115 | sscr1 = 0; | |
116 | ||
117 | ssp_disable(&corgi_ssp_dev); | |
118 | ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), sscr1, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_lcdcon)); | |
119 | ssp_enable(&corgi_ssp_dev); | |
120 | ||
121 | if (ssp_machinfo->cs_lcdcon >= 0) | |
122 | GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); | |
123 | ssp_write_word(&corgi_ssp_dev,data); | |
124 | /* Read null data back from device to prevent SSP overflow */ | |
125 | ssp_read_word(&corgi_ssp_dev, &tmp); | |
126 | if (ssp_machinfo->cs_lcdcon >= 0) | |
127 | GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); | |
128 | ||
129 | ssp_disable(&corgi_ssp_dev); | |
130 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); | |
131 | ssp_enable(&corgi_ssp_dev); | |
132 | ||
133 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | void corgi_ssp_lcdtg_send(u8 adrs, u8 data) | |
139 | { | |
140 | corgi_ssp_dac_put(((adrs & 0x07) << 5) | (data & 0x1f)); | |
141 | } | |
142 | ||
143 | void corgi_ssp_blduty_set(int duty) | |
144 | { | |
145 | corgi_ssp_lcdtg_send(0x02,duty); | |
146 | } | |
147 | ||
148 | EXPORT_SYMBOL(corgi_ssp_lcdtg_send); | |
149 | EXPORT_SYMBOL(corgi_ssp_blduty_set); | |
150 | ||
151 | /* | |
152 | * Max1111 Routines | |
153 | */ | |
154 | int corgi_ssp_max1111_get(ulong data) | |
155 | { | |
156 | unsigned long flag; | |
157 | long voltage = 0, voltage1 = 0, voltage2 = 0; | |
158 | ||
159 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
160 | if (ssp_machinfo->cs_max1111 >= 0) | |
161 | GPCR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); | |
162 | ssp_disable(&corgi_ssp_dev); | |
163 | ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_max1111)); | |
164 | ssp_enable(&corgi_ssp_dev); | |
165 | ||
166 | udelay(1); | |
167 | ||
168 | /* TB1/RB1 */ | |
169 | ssp_write_word(&corgi_ssp_dev,data); | |
170 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); /* null read */ | |
171 | ||
172 | /* TB12/RB2 */ | |
173 | ssp_write_word(&corgi_ssp_dev,0); | |
174 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); | |
175 | ||
176 | /* TB13/RB3*/ | |
177 | ssp_write_word(&corgi_ssp_dev,0); | |
178 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage2); | |
179 | ||
180 | ssp_disable(&corgi_ssp_dev); | |
181 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); | |
182 | ssp_enable(&corgi_ssp_dev); | |
183 | if (ssp_machinfo->cs_max1111 >= 0) | |
184 | GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); | |
185 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); | |
186 | ||
187 | if (voltage1 & 0xc0 || voltage2 & 0x3f) | |
188 | voltage = -1; | |
189 | else | |
190 | voltage = ((voltage1 << 2) & 0xfc) | ((voltage2 >> 6) & 0x03); | |
191 | ||
192 | return voltage; | |
193 | } | |
194 | ||
195 | EXPORT_SYMBOL(corgi_ssp_max1111_get); | |
196 | ||
197 | /* | |
198 | * Support Routines | |
199 | */ | |
200 | ||
201 | void __init corgi_ssp_set_machinfo(struct corgissp_machinfo *machinfo) | |
202 | { | |
203 | ssp_machinfo = machinfo; | |
204 | } | |
205 | ||
91a99dfc | 206 | static int __devinit corgi_ssp_probe(struct platform_device *dev) |
25af3b0f EM |
207 | { |
208 | int ret; | |
209 | ||
210 | /* Chip Select - Disable All */ | |
211 | if (ssp_machinfo->cs_lcdcon >= 0) | |
212 | pxa_gpio_mode(ssp_machinfo->cs_lcdcon | GPIO_OUT | GPIO_DFLT_HIGH); | |
213 | if (ssp_machinfo->cs_max1111 >= 0) | |
214 | pxa_gpio_mode(ssp_machinfo->cs_max1111 | GPIO_OUT | GPIO_DFLT_HIGH); | |
215 | if (ssp_machinfo->cs_ads7846 >= 0) | |
216 | pxa_gpio_mode(ssp_machinfo->cs_ads7846 | GPIO_OUT | GPIO_DFLT_HIGH); | |
217 | ||
218 | ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0); | |
219 | ||
220 | if (ret) | |
221 | printk(KERN_ERR "Unable to register SSP handler!\n"); | |
222 | else { | |
223 | ssp_disable(&corgi_ssp_dev); | |
224 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); | |
225 | ssp_enable(&corgi_ssp_dev); | |
226 | } | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static int corgi_ssp_remove(struct platform_device *dev) | |
232 | { | |
233 | ssp_exit(&corgi_ssp_dev); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static int corgi_ssp_suspend(struct platform_device *dev, pm_message_t state) | |
238 | { | |
239 | ssp_flush(&corgi_ssp_dev); | |
240 | ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static int corgi_ssp_resume(struct platform_device *dev) | |
246 | { | |
247 | if (ssp_machinfo->cs_lcdcon >= 0) | |
248 | GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); /* High - Disable LCD Control/Timing Gen */ | |
249 | if (ssp_machinfo->cs_max1111 >= 0) | |
250 | GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/ | |
251 | if (ssp_machinfo->cs_ads7846 >= 0) | |
252 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); /* High - Disable ADS7846*/ | |
253 | ssp_restore_state(&corgi_ssp_dev,&corgi_ssp_state); | |
254 | ssp_enable(&corgi_ssp_dev); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static struct platform_driver corgissp_driver = { | |
260 | .probe = corgi_ssp_probe, | |
261 | .remove = corgi_ssp_remove, | |
262 | .suspend = corgi_ssp_suspend, | |
263 | .resume = corgi_ssp_resume, | |
264 | .driver = { | |
265 | .name = "corgi-ssp", | |
266 | }, | |
267 | }; | |
268 | ||
269 | int __init corgi_ssp_init(void) | |
270 | { | |
271 | return platform_driver_register(&corgissp_driver); | |
272 | } | |
273 | ||
274 | arch_initcall(corgi_ssp_init); |