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 <asm/hardware.h>
  20 #include <asm/mach-types.h>
  21
  22 #include <asm/arch/ssp.h>
  23 #include <asm/arch/pxa-regs.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 contoller (with some Backlight functionality)
  35  *   3. A battery moinitoring 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 ret,flag;
  51
  52         spin_lock_irqsave(&corgi_ssp_lock, flag);
  53         if (ssp_machinfo->cs_ads7846 >= 0)
  54                 GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  55
  56         ssp_write_word(&corgi_ssp_dev,data);
  57         ret = ssp_read_word(&corgi_ssp_dev);
  58
  59         if (ssp_machinfo->cs_ads7846 >= 0)
  60                 GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  61         spin_unlock_irqrestore(&corgi_ssp_lock, flag);
  62
  63         return ret;
  64 }
  65
  66 /*
  67  * NOTE: These functions should always be called in interrupt context
  68  * and use the _lock and _unlock functions. They are very time sensitive.
  69  */
  70 void corgi_ssp_ads7846_lock(void)
  71 {
  72         spin_lock(&corgi_ssp_lock);
  73         if (ssp_machinfo->cs_ads7846 >= 0)
  74                 GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  75 }
  76
  77 void corgi_ssp_ads7846_unlock(void)
  78 {
  79         if (ssp_machinfo->cs_ads7846 >= 0)
  80                 GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
  81         spin_unlock(&corgi_ssp_lock);
  82 }
  83
  84 void corgi_ssp_ads7846_put(ulong data)
  85 {
  86         ssp_write_word(&corgi_ssp_dev,data);
  87 }
  88
  89 unsigned long corgi_ssp_ads7846_get(void)
  90 {
  91         return ssp_read_word(&corgi_ssp_dev);
  92 }
  93
  94 EXPORT_SYMBOL(corgi_ssp_ads7846_putget);
  95 EXPORT_SYMBOL(corgi_ssp_ads7846_lock);
  96 EXPORT_SYMBOL(corgi_ssp_ads7846_unlock);
  97 EXPORT_SYMBOL(corgi_ssp_ads7846_put);
  98 EXPORT_SYMBOL(corgi_ssp_ads7846_get);
  99
 100
 101 /*
 102  *  LCD/Backlight Routines
 103  */
 104 unsigned long corgi_ssp_dac_put(ulong data)
 105 {
 106         unsigned long flag, sscr1 = SSCR1_SPH;
 107
 108         spin_lock_irqsave(&corgi_ssp_lock, flag);
 109
 110         if (machine_is_spitz() || machine_is_akita() || machine_is_borzoi())
 111                 sscr1 = 0;
 112
 113         ssp_disable(&corgi_ssp_dev);
 114         ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), sscr1, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_lcdcon));
 115         ssp_enable(&corgi_ssp_dev);
 116
 117         if (ssp_machinfo->cs_lcdcon >= 0)
 118                 GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
 119         ssp_write_word(&corgi_ssp_dev,data);
 120         /* Read null data back from device to prevent SSP overflow */
 121         ssp_read_word(&corgi_ssp_dev);
 122         if (ssp_machinfo->cs_lcdcon >= 0)
 123                 GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
 124
 125         ssp_disable(&corgi_ssp_dev);
 126         ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 127         ssp_enable(&corgi_ssp_dev);
 128
 129         spin_unlock_irqrestore(&corgi_ssp_lock, flag);
 130
 131         return 0;
 132 }
 133
 134 void corgi_ssp_lcdtg_send(u8 adrs, u8 data)
 135 {
 136         corgi_ssp_dac_put(((adrs & 0x07) << 5) | (data & 0x1f));
 137 }
 138
 139 void corgi_ssp_blduty_set(int duty)
 140 {
 141         corgi_ssp_lcdtg_send(0x02,duty);
 142 }
 143
 144 EXPORT_SYMBOL(corgi_ssp_lcdtg_send);
 145 EXPORT_SYMBOL(corgi_ssp_blduty_set);
 146
 147 /*
 148  *  Max1111 Routines
 149  */
 150 int corgi_ssp_max1111_get(ulong data)
 151 {
 152         unsigned long flag;
 153         int voltage,voltage1,voltage2;
 154
 155         spin_lock_irqsave(&corgi_ssp_lock, flag);
 156         if (ssp_machinfo->cs_max1111 >= 0)
 157                 GPCR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
 158         ssp_disable(&corgi_ssp_dev);
 159         ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_max1111));
 160         ssp_enable(&corgi_ssp_dev);
 161
 162         udelay(1);
 163
 164         /* TB1/RB1 */
 165         ssp_write_word(&corgi_ssp_dev,data);
 166         ssp_read_word(&corgi_ssp_dev); /* null read */
 167
 168         /* TB12/RB2 */
 169         ssp_write_word(&corgi_ssp_dev,0);
 170         voltage1=ssp_read_word(&corgi_ssp_dev);
 171
 172         /* TB13/RB3*/
 173         ssp_write_word(&corgi_ssp_dev,0);
 174         voltage2=ssp_read_word(&corgi_ssp_dev);
 175
 176         ssp_disable(&corgi_ssp_dev);
 177         ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 178         ssp_enable(&corgi_ssp_dev);
 179         if (ssp_machinfo->cs_max1111 >= 0)
 180                 GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
 181         spin_unlock_irqrestore(&corgi_ssp_lock, flag);
 182
 183         if (voltage1 & 0xc0 || voltage2 & 0x3f)
 184                 voltage = -1;
 185         else
 186                 voltage = ((voltage1 << 2) & 0xfc) | ((voltage2 >> 6) & 0x03);
 187
 188         return voltage;
 189 }
 190
 191 EXPORT_SYMBOL(corgi_ssp_max1111_get);
 192
 193 /*
 194  *  Support Routines
 195  */
 196
 197 void __init corgi_ssp_set_machinfo(struct corgissp_machinfo *machinfo)
 198 {
 199         ssp_machinfo = machinfo;
 200 }
 201
 202 static int __init corgi_ssp_probe(struct platform_device *dev)
 203 {
 204         int ret;
 205
 206         /* Chip Select - Disable All */
 207         if (ssp_machinfo->cs_lcdcon >= 0)
 208                 pxa_gpio_mode(ssp_machinfo->cs_lcdcon  | GPIO_OUT | GPIO_DFLT_HIGH);
 209         if (ssp_machinfo->cs_max1111 >= 0)
 210                 pxa_gpio_mode(ssp_machinfo->cs_max1111 | GPIO_OUT | GPIO_DFLT_HIGH);
 211         if (ssp_machinfo->cs_ads7846 >= 0)
 212                 pxa_gpio_mode(ssp_machinfo->cs_ads7846 | GPIO_OUT | GPIO_DFLT_HIGH);
 213
 214         ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0);
 215
 216         if (ret)
 217                 printk(KERN_ERR "Unable to register SSP handler!\n");
 218         else {
 219                 ssp_disable(&corgi_ssp_dev);
 220                 ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
 221                 ssp_enable(&corgi_ssp_dev);
 222         }
 223
 224         return ret;
 225 }
 226
 227 static int corgi_ssp_remove(struct platform_device *dev)
 228 {
 229         ssp_exit(&corgi_ssp_dev);
 230         return 0;
 231 }
 232
 233 static int corgi_ssp_suspend(struct platform_device *dev, pm_message_t state)
 234 {
 235         ssp_flush(&corgi_ssp_dev);
 236         ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state);
 237
 238         return 0;
 239 }
 240
 241 static int corgi_ssp_resume(struct platform_device *dev)
 242 {
 243         if (ssp_machinfo->cs_lcdcon >= 0)
 244                 GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);  /* High - Disable LCD Control/Timing Gen */
 245         if (ssp_machinfo->cs_max1111 >= 0)
 246                 GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/
 247         if (ssp_machinfo->cs_ads7846 >= 0)
 248                 GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); /* High - Disable ADS7846*/
 249         ssp_restore_state(&corgi_ssp_dev,&corgi_ssp_state);
 250         ssp_enable(&corgi_ssp_dev);
 251
 252         return 0;
 253 }
 254
 255 static struct platform_driver corgissp_driver = {
 256         .probe          = corgi_ssp_probe,
 257         .remove         = corgi_ssp_remove,
 258         .suspend        = corgi_ssp_suspend,
 259         .resume         = corgi_ssp_resume,
 260         .driver         = {
 261                 .name   = "corgi-ssp",
 262         },
 263 };
 264
 265 int __init corgi_ssp_init(void)
 266 {
 267         return platform_driver_register(&corgissp_driver);
 268 }
 269
 270 arch_initcall(corgi_ssp_init);