arch/arm/mach-pxa/corgi_ssp.c

   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>
  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>
  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
 206 static int __devinit corgi_ssp_probe(struct platform_device *dev)
 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);