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/slab.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <mach/hardware.h>
  20 #include <asm/mach-types.h>
  21
  22 #include <mach/ssp.h>
  23 #include <mach/pxa-regs.h>
  24 #include <mach/pxa2xx-gpio.h>
  25 #include <mach/regs-ssp.h>
  26 #include "sharpsl.h"
  27
  28 static DEFINE_SPINLOCK(corgi_ssp_lock);
  29 static struct ssp_dev corgi_ssp_dev;
  30 static struct ssp_state corgi_ssp_state;
  31 static struct corgissp_machinfo *ssp_machinfo;
  32
  33 /*
  34  * There are three devices connected to the SSP interface:
  35  *   1. A touchscreen controller (TI ADS7846 compatible)
  36  *   2. An LCD controller (with some Backlight functionality)
  37  *   3. A battery monitoring IC (Maxim MAX1111)
  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 {
  52         unsigned long flag;
  53         u32 ret = 0;
  54
  55         spin_lock_irqsave(&corgi_ssp_lock, flag);
  56         if (ssp_machinfo->cs_ads7846 >= 0)
  57                 GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  58
  59         ssp_write_word(&corgi_ssp_dev,data);
  60         ssp_read_word(&corgi_ssp_dev, &ret);
  61
  62         if (ssp_machinfo->cs_ads7846 >= 0)
  63                 GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  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);
  76         if (ssp_machinfo->cs_ads7846 >= 0)
  77                 GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  78 }
  79
  80 void corgi_ssp_ads7846_unlock(void)
  81 {
  82         if (ssp_machinfo->cs_ads7846 >= 0)
  83                 GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  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 {
  94         u32 ret = 0;
  95         ssp_read_word(&corgi_ssp_dev, &ret);
  96         return ret;
  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 {
 111         unsigned long flag, sscr1 = SSCR1_SPH;
 112         u32 tmp;
 113
 114         spin_lock_irqsave(&corgi_ssp_lock, flag);
 115
 116         if (machine_is_spitz() || machine_is_akita() || machine_is_borzoi())
 117                 sscr1 = 0;
 118
 119         ssp_disable(&corgi_ssp_dev);
 120         ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), sscr1, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_lcdcon));
 121         ssp_enable(&corgi_ssp_dev);
 122
 123         if (ssp_machinfo->cs_lcdcon >= 0)
 124                 GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
 125         ssp_write_word(&corgi_ssp_dev,data);
 126         /* Read null data back from device to prevent SSP overflow */
 127         ssp_read_word(&corgi_ssp_dev, &tmp);
 128         if (ssp_machinfo->cs_lcdcon >= 0)
 129                 GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
 130
 131         ssp_disable(&corgi_ssp_dev);
 132         ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 133         ssp_enable(&corgi_ssp_dev);
 134
 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;
 159         long voltage = 0, voltage1 = 0, voltage2 = 0;
 160
 161         spin_lock_irqsave(&corgi_ssp_lock, flag);
 162         if (ssp_machinfo->cs_max1111 >= 0)
 163                 GPCR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
 164         ssp_disable(&corgi_ssp_dev);
 165         ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_max1111));
 166         ssp_enable(&corgi_ssp_dev);
 167
 168         udelay(1);
 169
 170         /* TB1/RB1 */
 171         ssp_write_word(&corgi_ssp_dev,data);
 172         ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); /* null read */
 173
 174         /* TB12/RB2 */
 175         ssp_write_word(&corgi_ssp_dev,0);
 176         ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1);
 177
 178         /* TB13/RB3*/
 179         ssp_write_word(&corgi_ssp_dev,0);
 180         ssp_read_word(&corgi_ssp_dev, (u32*)&voltage2);
 181
 182         ssp_disable(&corgi_ssp_dev);
 183         ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 184         ssp_enable(&corgi_ssp_dev);
 185         if (ssp_machinfo->cs_max1111 >= 0)
 186                 GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
 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  */
 202
 203 void __init corgi_ssp_set_machinfo(struct corgissp_machinfo *machinfo)
 204 {
 205         ssp_machinfo = machinfo;
 206 }
 207
 208 static int __init corgi_ssp_probe(struct platform_device *dev)
 209 {
 210         int ret;
 211
 212         /* Chip Select - Disable All */
 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);
 219
 220         ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0);
 221
 222         if (ret)
 223                 printk(KERN_ERR "Unable to register SSP handler!\n");
 224         else {
 225                 ssp_disable(&corgi_ssp_dev);
 226                 ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 227                 ssp_enable(&corgi_ssp_dev);
 228         }
 229
 230         return ret;
 231 }
 232
 233 static int corgi_ssp_remove(struct platform_device *dev)
 234 {
 235         ssp_exit(&corgi_ssp_dev);
 236         return 0;
 237 }
 238
 239 static int corgi_ssp_suspend(struct platform_device *dev, pm_message_t state)
 240 {
 241         ssp_flush(&corgi_ssp_dev);
 242         ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state);
 243
 244         return 0;
 245 }
 246
 247 static int corgi_ssp_resume(struct platform_device *dev)
 248 {
 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*/
 255         ssp_restore_state(&corgi_ssp_dev,&corgi_ssp_state);
 256         ssp_enable(&corgi_ssp_dev);
 257
 258         return 0;
 259 }
 260
 261 static struct platform_driver corgissp_driver = {
 262         .probe          = corgi_ssp_probe,
 263         .remove         = corgi_ssp_remove,
 264         .suspend        = corgi_ssp_suspend,
 265         .resume         = corgi_ssp_resume,
 266         .driver         = {
 267                 .name   = "corgi-ssp",
 268         },
 269 };
 270
 271 int __init corgi_ssp_init(void)
 272 {
 273         return platform_driver_register(&corgissp_driver);
 274 }
 275
 276 arch_initcall(corgi_ssp_init);