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