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1da177e4 LT |
1 | /* |
2 | * SSP control code for Sharp Corgi devices | |
3 | * | |
50a5de44 | 4 | * Copyright (c) 2004-2005 Richard Purdie |
1da177e4 LT |
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> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/delay.h> | |
d052d1be | 18 | #include <linux/platform_device.h> |
1da177e4 | 19 | #include <asm/hardware.h> |
50a5de44 | 20 | #include <asm/mach-types.h> |
1da177e4 LT |
21 | |
22 | #include <asm/arch/ssp.h> | |
1da177e4 | 23 | #include <asm/arch/pxa-regs.h> |
a683b14d | 24 | #include <asm/arch/pxa2xx-gpio.h> |
0aea1fd5 | 25 | #include <asm/arch/regs-ssp.h> |
50a5de44 | 26 | #include "sharpsl.h" |
1da177e4 | 27 | |
a9f6a0dd | 28 | static DEFINE_SPINLOCK(corgi_ssp_lock); |
1da177e4 LT |
29 | static struct ssp_dev corgi_ssp_dev; |
30 | static struct ssp_state corgi_ssp_state; | |
50a5de44 | 31 | static struct corgissp_machinfo *ssp_machinfo; |
1da177e4 LT |
32 | |
33 | /* | |
34 | * There are three devices connected to the SSP interface: | |
35 | * 1. A touchscreen controller (TI ADS7846 compatible) | |
87b9bcd5 | 36 | * 2. An LCD controller (with some Backlight functionality) |
6cbdc8c5 | 37 | * 3. A battery monitoring IC (Maxim MAX1111) |
1da177e4 LT |
38 | * |
39 | * Each device uses a different speed/mode of communication. | |
40 | * | |
41 | * The touchscreen is very sensitive and the most frequently used | |
42 | * so the port is left configured for this. | |
43 | * | |
44 | * Devices are selected using Chip Selects on GPIOs. | |
45 | */ | |
46 | ||
47 | /* | |
48 | * ADS7846 Routines | |
49 | */ | |
50 | unsigned long corgi_ssp_ads7846_putget(ulong data) | |
51 | { | |
8f1bf874 PS |
52 | unsigned long flag; |
53 | u32 ret = 0; | |
1da177e4 LT |
54 | |
55 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
faed5684 RP |
56 | if (ssp_machinfo->cs_ads7846 >= 0) |
57 | GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
1da177e4 LT |
58 | |
59 | ssp_write_word(&corgi_ssp_dev,data); | |
8f1bf874 | 60 | ssp_read_word(&corgi_ssp_dev, &ret); |
1da177e4 | 61 | |
faed5684 RP |
62 | if (ssp_machinfo->cs_ads7846 >= 0) |
63 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
1da177e4 LT |
64 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | /* | |
70 | * NOTE: These functions should always be called in interrupt context | |
71 | * and use the _lock and _unlock functions. They are very time sensitive. | |
72 | */ | |
73 | void corgi_ssp_ads7846_lock(void) | |
74 | { | |
75 | spin_lock(&corgi_ssp_lock); | |
faed5684 RP |
76 | if (ssp_machinfo->cs_ads7846 >= 0) |
77 | GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
1da177e4 LT |
78 | } |
79 | ||
80 | void corgi_ssp_ads7846_unlock(void) | |
81 | { | |
faed5684 RP |
82 | if (ssp_machinfo->cs_ads7846 >= 0) |
83 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); | |
1da177e4 LT |
84 | spin_unlock(&corgi_ssp_lock); |
85 | } | |
86 | ||
87 | void corgi_ssp_ads7846_put(ulong data) | |
88 | { | |
89 | ssp_write_word(&corgi_ssp_dev,data); | |
90 | } | |
91 | ||
92 | unsigned long corgi_ssp_ads7846_get(void) | |
93 | { | |
8f1bf874 PS |
94 | u32 ret = 0; |
95 | ssp_read_word(&corgi_ssp_dev, &ret); | |
96 | return ret; | |
1da177e4 LT |
97 | } |
98 | ||
99 | EXPORT_SYMBOL(corgi_ssp_ads7846_putget); | |
100 | EXPORT_SYMBOL(corgi_ssp_ads7846_lock); | |
101 | EXPORT_SYMBOL(corgi_ssp_ads7846_unlock); | |
102 | EXPORT_SYMBOL(corgi_ssp_ads7846_put); | |
103 | EXPORT_SYMBOL(corgi_ssp_ads7846_get); | |
104 | ||
105 | ||
106 | /* | |
107 | * LCD/Backlight Routines | |
108 | */ | |
109 | unsigned long corgi_ssp_dac_put(ulong data) | |
110 | { | |
50a5de44 | 111 | unsigned long flag, sscr1 = SSCR1_SPH; |
8f1bf874 | 112 | u32 tmp; |
1da177e4 LT |
113 | |
114 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
50a5de44 RP |
115 | |
116 | if (machine_is_spitz() || machine_is_akita() || machine_is_borzoi()) | |
117 | sscr1 = 0; | |
1da177e4 LT |
118 | |
119 | ssp_disable(&corgi_ssp_dev); | |
50a5de44 | 120 | ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), sscr1, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_lcdcon)); |
1da177e4 LT |
121 | ssp_enable(&corgi_ssp_dev); |
122 | ||
faed5684 RP |
123 | if (ssp_machinfo->cs_lcdcon >= 0) |
124 | GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); | |
1da177e4 LT |
125 | ssp_write_word(&corgi_ssp_dev,data); |
126 | /* Read null data back from device to prevent SSP overflow */ | |
8f1bf874 | 127 | ssp_read_word(&corgi_ssp_dev, &tmp); |
faed5684 RP |
128 | if (ssp_machinfo->cs_lcdcon >= 0) |
129 | GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); | |
1da177e4 LT |
130 | |
131 | ssp_disable(&corgi_ssp_dev); | |
50a5de44 | 132 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); |
1da177e4 | 133 | ssp_enable(&corgi_ssp_dev); |
50a5de44 | 134 | |
1da177e4 LT |
135 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | void corgi_ssp_lcdtg_send(u8 adrs, u8 data) | |
141 | { | |
142 | corgi_ssp_dac_put(((adrs & 0x07) << 5) | (data & 0x1f)); | |
143 | } | |
144 | ||
145 | void corgi_ssp_blduty_set(int duty) | |
146 | { | |
147 | corgi_ssp_lcdtg_send(0x02,duty); | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL(corgi_ssp_lcdtg_send); | |
151 | EXPORT_SYMBOL(corgi_ssp_blduty_set); | |
152 | ||
153 | /* | |
154 | * Max1111 Routines | |
155 | */ | |
156 | int corgi_ssp_max1111_get(ulong data) | |
157 | { | |
158 | unsigned long flag; | |
8f1bf874 | 159 | long voltage = 0, voltage1 = 0, voltage2 = 0; |
1da177e4 LT |
160 | |
161 | spin_lock_irqsave(&corgi_ssp_lock, flag); | |
faed5684 RP |
162 | if (ssp_machinfo->cs_max1111 >= 0) |
163 | GPCR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); | |
1da177e4 | 164 | ssp_disable(&corgi_ssp_dev); |
50a5de44 | 165 | ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_max1111)); |
1da177e4 LT |
166 | ssp_enable(&corgi_ssp_dev); |
167 | ||
168 | udelay(1); | |
169 | ||
170 | /* TB1/RB1 */ | |
171 | ssp_write_word(&corgi_ssp_dev,data); | |
8f1bf874 | 172 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); /* null read */ |
1da177e4 LT |
173 | |
174 | /* TB12/RB2 */ | |
175 | ssp_write_word(&corgi_ssp_dev,0); | |
8f1bf874 | 176 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); |
1da177e4 LT |
177 | |
178 | /* TB13/RB3*/ | |
179 | ssp_write_word(&corgi_ssp_dev,0); | |
8f1bf874 | 180 | ssp_read_word(&corgi_ssp_dev, (u32*)&voltage2); |
1da177e4 LT |
181 | |
182 | ssp_disable(&corgi_ssp_dev); | |
50a5de44 | 183 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); |
1da177e4 | 184 | ssp_enable(&corgi_ssp_dev); |
faed5684 RP |
185 | if (ssp_machinfo->cs_max1111 >= 0) |
186 | GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); | |
1da177e4 LT |
187 | spin_unlock_irqrestore(&corgi_ssp_lock, flag); |
188 | ||
189 | if (voltage1 & 0xc0 || voltage2 & 0x3f) | |
190 | voltage = -1; | |
191 | else | |
192 | voltage = ((voltage1 << 2) & 0xfc) | ((voltage2 >> 6) & 0x03); | |
193 | ||
194 | return voltage; | |
195 | } | |
196 | ||
197 | EXPORT_SYMBOL(corgi_ssp_max1111_get); | |
198 | ||
199 | /* | |
200 | * Support Routines | |
201 | */ | |
50a5de44 RP |
202 | |
203 | void __init corgi_ssp_set_machinfo(struct corgissp_machinfo *machinfo) | |
204 | { | |
205 | ssp_machinfo = machinfo; | |
206 | } | |
207 | ||
3ae5eaec | 208 | static int __init corgi_ssp_probe(struct platform_device *dev) |
1da177e4 LT |
209 | { |
210 | int ret; | |
211 | ||
212 | /* Chip Select - Disable All */ | |
faed5684 RP |
213 | if (ssp_machinfo->cs_lcdcon >= 0) |
214 | pxa_gpio_mode(ssp_machinfo->cs_lcdcon | GPIO_OUT | GPIO_DFLT_HIGH); | |
215 | if (ssp_machinfo->cs_max1111 >= 0) | |
216 | pxa_gpio_mode(ssp_machinfo->cs_max1111 | GPIO_OUT | GPIO_DFLT_HIGH); | |
217 | if (ssp_machinfo->cs_ads7846 >= 0) | |
218 | pxa_gpio_mode(ssp_machinfo->cs_ads7846 | GPIO_OUT | GPIO_DFLT_HIGH); | |
1da177e4 | 219 | |
b216c018 | 220 | ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0); |
1da177e4 LT |
221 | |
222 | if (ret) | |
223 | printk(KERN_ERR "Unable to register SSP handler!\n"); | |
224 | else { | |
225 | ssp_disable(&corgi_ssp_dev); | |
50a5de44 | 226 | ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); |
1da177e4 LT |
227 | ssp_enable(&corgi_ssp_dev); |
228 | } | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
3ae5eaec | 233 | static int corgi_ssp_remove(struct platform_device *dev) |
1da177e4 LT |
234 | { |
235 | ssp_exit(&corgi_ssp_dev); | |
236 | return 0; | |
237 | } | |
238 | ||
3ae5eaec | 239 | static int corgi_ssp_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 240 | { |
9480e307 RK |
241 | ssp_flush(&corgi_ssp_dev); |
242 | ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state); | |
243 | ||
1da177e4 LT |
244 | return 0; |
245 | } | |
246 | ||
3ae5eaec | 247 | static int corgi_ssp_resume(struct platform_device *dev) |
1da177e4 | 248 | { |
faed5684 RP |
249 | if (ssp_machinfo->cs_lcdcon >= 0) |
250 | GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); /* High - Disable LCD Control/Timing Gen */ | |
251 | if (ssp_machinfo->cs_max1111 >= 0) | |
252 | GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/ | |
253 | if (ssp_machinfo->cs_ads7846 >= 0) | |
254 | GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); /* High - Disable ADS7846*/ | |
9480e307 RK |
255 | ssp_restore_state(&corgi_ssp_dev,&corgi_ssp_state); |
256 | ssp_enable(&corgi_ssp_dev); | |
257 | ||
1da177e4 LT |
258 | return 0; |
259 | } | |
260 | ||
3ae5eaec | 261 | static struct platform_driver corgissp_driver = { |
1da177e4 LT |
262 | .probe = corgi_ssp_probe, |
263 | .remove = corgi_ssp_remove, | |
264 | .suspend = corgi_ssp_suspend, | |
265 | .resume = corgi_ssp_resume, | |
3ae5eaec RK |
266 | .driver = { |
267 | .name = "corgi-ssp", | |
268 | }, | |
1da177e4 LT |
269 | }; |
270 | ||
271 | int __init corgi_ssp_init(void) | |
272 | { | |
3ae5eaec | 273 | return platform_driver_register(&corgissp_driver); |
1da177e4 LT |
274 | } |
275 | ||
276 | arch_initcall(corgi_ssp_init); |