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