drivers/ssi/omap-tsc2101.c

   1 /*
   2  * linux/drivers/ssi/omap-tsc2101.c
   3  *
   4  * TSC2101 codec interface driver for the OMAP platform
   5  *
   6  * Copyright (C) 2004 Texas Instruments, Inc.
   7  *
   8  * This package is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  13  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  14  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  15  *
  16  * History:
  17  *
  18  * 2004/11/07   Nishanth Menon - Modified for common hooks for Audio and Touchscreen
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/sched.h>
  24 #include <linux/errno.h>
  25 #include <linux/delay.h>
  26 #include <linux/clk.h>
  27
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31 #include <asm/mach-types.h>
  32 #include <asm/hardware.h>
  33
  34 #include <asm/arch/mux.h>
  35 #include <asm/arch/io.h>
  36 #include <asm/arch/hardware.h>
  37 #include <asm/hardware/tsc2101.h>
  38 #include <asm/arch/gpioexpander.h>
  39 #include <asm/arch/gpio.h>
  40
  41 #include "omap-tsc2101.h"
  42
  43 #if CONFIG_ARCH_OMAP1
  44 #include <../drivers/ssi/omap-uwire.h>
  45 #else
  46 #error "Unsupported configuration"
  47 #endif
  48
  49 #define SPIO 1
  50
  51 static int count;
  52 static spinlock_t tsc2101_lock = SPIN_LOCK_UNLOCKED;
  53 static struct clk  * tsc2101_mclk_ck;
  54
  55 static int omap_tsc2101_configure(void);
  56
  57 /* FIXME: add driver model usage to powerdown the tsc2101 on suspend */
  58 /* Clock  -Hard coding for the time being */
  59 #define CLK_SOFT_REQ_REG_BASE  (0xFFFE0800+0x34)
  60 #define SOFT_COM_MCK0_REQ_MASK (0x1<<6)
  61
  62 int omap_tsc2101_enable(void)
  63 {
  64         int ret = 0;
  65
  66         spin_lock(&tsc2101_lock);
  67         if (count++ == 0) {
  68                 int ret = 0;
  69                 /* set the Mux to provide MCLK to TSC2101 */
  70                 if (machine_is_omap_h3())
  71                         ret = omap_cfg_reg(V5_1710_MCLK_ON);
  72                 else if (machine_is_omap_h2())
  73                         ret = omap_cfg_reg(R10_1610_MCLK_ON);
  74                 else if (machine_is_omap_h6300())
  75                         ret = omap_cfg_reg(R10_1510_MCLK_ON);
  76
  77                 if (!cpu_is_omap1510 ()) {
  78                         /* Get the MCLK */
  79                         tsc2101_mclk_ck = clk_get(NULL, "mclk");
  80                         if (NULL == tsc2101_mclk_ck) {
  81                                 printk(KERN_ERR "Unable to get the clock MCLK!!!\n");;
  82                                 ret = -EPERM;
  83                                 goto done;
  84                         }
  85                         if (clk_set_rate(tsc2101_mclk_ck, 12000000)) {
  86                                 printk(KERN_ERR "Unable to set rate to the MCLK!!!\n");;
  87                                 ret = -EPERM;
  88                                 goto done;
  89                         }
  90                         clk_enable(tsc2101_mclk_ck);
  91                 } /* if (!cpu_is_omap1510 ()) */
  92
  93                 ret = omap_tsc2101_configure();
  94
  95                 /* Lock the module */
  96                 if (!ret && !try_module_get(THIS_MODULE)) {
  97                         printk(KERN_CRIT "Failed to get TSC module\n");
  98                         ret = -ESTALE;
  99                 }
 100         }
 101
 102 done:
 103         spin_unlock(&tsc2101_lock);
 104         return ret;
 105 }
 106
 107 void omap_tsc2101_disable(void)
 108 {
 109         spin_lock(&tsc2101_lock);
 110         if (--count == 0) {
 111                 int ret = 0;
 112                 /* Remove the Mux to Stop MCLK to TSC2101 */
 113                 if (machine_is_omap_h3()) {
 114                         ret = omap_cfg_reg(V5_1710_MCLK_OFF);
 115                 } else {
 116                         if (machine_is_omap_h2()) {
 117                                 ret = omap_cfg_reg(R10_1610_MCLK_OFF);
 118                         }
 119                 }
 120
 121                 if (!cpu_is_omap1510 ()) {
 122                         /* Release the MCLK */
 123                         clk_disable(tsc2101_mclk_ck);
 124                         clk_put(tsc2101_mclk_ck);
 125                         tsc2101_mclk_ck = NULL;
 126                 }
 127
 128 #if defined(CONFIG_MACH_OMAP_H6300)
 129                 omap_free_gpio(8);
 130 #endif
 131
 132                 module_put(THIS_MODULE);
 133         }
 134         spin_unlock(&tsc2101_lock);
 135 }
 136
 137 void omap_tsc2101_write(int page, u8 address, u16 data)
 138 {
 139
 140         int ret = 0;
 141
 142         if (machine_is_omap_h2()) {
 143                 ret =
 144                     omap_uwire_data_transfer(1,
 145                                              (((page) << 11) | (address << 5)),
 146                                              16, 0, NULL, 1);
 147                 if (ret) {
 148                         printk(KERN_ERR
 149                                "uwire-write returned error for address %x\n",
 150                                address);
 151                         return;
 152                 }
 153                 ret = omap_uwire_data_transfer(1, data, 16, 0, NULL, 0);
 154                 if (ret) {
 155                         printk(KERN_ERR
 156                                "uwire-write returned error for address %x\n",
 157                                address);
 158                         return;
 159                 }
 160         }
 161         if (machine_is_omap_h3() || machine_is_omap_h6300()) {
 162
 163                 if (machine_is_omap_h6300())
 164                         omap_set_gpio_dataout (8, 0);
 165
 166                 ret =
 167                     omap_uwire_data_transfer(0, ((page << 11) | (address << 5)),
 168                                              16, 0, NULL, 1);
 169                 if (ret) {
 170                         printk(KERN_ERR
 171                                "uwire-write returned error for address %x\n",
 172                                address);
 173                 if (machine_is_omap_h6300())
 174                         omap_set_gpio_dataout (8, 1);
 175                         return;
 176                 }
 177                 ret = omap_uwire_data_transfer(0, data, 16, 0, NULL, 0);
 178                 if (ret) {
 179                         printk(KERN_ERR
 180                                "uwire-write returned error for address %x\n",
 181                                address);
 182                         if (machine_is_omap_h6300())
 183                                 omap_set_gpio_dataout (8, 1);
 184                         return;
 185                 }
 186
 187                 if (machine_is_omap_h6300())
 188                         omap_set_gpio_dataout (8, 1);
 189         }
 190 }
 191
 192 void omap_tsc2101_reads(int page, u8 startaddress, u16 * data, int numregs)
 193 {
 194         int cs = 0, i;
 195         if (machine_is_omap_h2()) {
 196                 cs = 1;
 197         }
 198         if (machine_is_omap_h3() || machine_is_omap_h6300()) {
 199                 cs = 0;
 200         }
 201
 202         if (machine_is_omap_h6300())
 203                 omap_set_gpio_dataout(8, 0);
 204
 205         (void)omap_uwire_data_transfer(cs, (0x8000 | (page << 11)
 206                                             | (startaddress << 5)),
 207                                        16, 0, NULL, 1);
 208         for (i = 0; i < (numregs - 1); i++, data++) {
 209                 omap_uwire_data_transfer(cs, 0, 0, 16, data, 1);
 210         }
 211         omap_uwire_data_transfer(cs, 0, 0, 16, data, 0);
 212
 213         if (machine_is_omap_h6300())
 214                 omap_set_gpio_dataout(8, 1);
 215 }
 216
 217 u16 omap_tsc2101_read(int page, u8 address)
 218 {
 219         u16 ret;
 220         omap_tsc2101_reads(page, address, &ret, 1);
 221         return ret;
 222 }
 223
 224 /* FIXME: adapt clock divisors for uwire to current ARM xor clock rate */
 225 static int omap_tsc2101_configure(void)
 226 {
 227         unsigned long uwire_flags = 0;
 228
 229 #ifdef CONFIG_MACH_OMAP_H3
 230         int err = 0;
 231         u8 ioExpanderVal = 0;
 232
 233         if ((err = read_gpio_expa(&ioExpanderVal, 0x24))) {
 234                 printk(" Error reading from I/O EXPANDER \n");
 235                 return err;
 236         }
 237         ioExpanderVal |= 0x8;
 238
 239         if ((err = write_gpio_expa(ioExpanderVal, 0x24))) {
 240                 printk(KERN_ERR ": Error writing to I/O EXPANDER \n");
 241                 return err;
 242         }
 243 #endif
 244
 245         if (machine_is_omap_h2()) {
 246                 uwire_flags = UWIRE_READ_RISING_EDGE | UWIRE_WRITE_RISING_EDGE;
 247                 omap_cfg_reg(N15_1610_UWIRE_CS1);
 248                 omap_uwire_configure_mode(1, uwire_flags);
 249         }
 250         if (machine_is_omap_h3()) {
 251                 uwire_flags = UWIRE_READ_RISING_EDGE | UWIRE_WRITE_RISING_EDGE;
 252                 omap_cfg_reg(N14_1610_UWIRE_CS0);
 253                 omap_uwire_configure_mode(0, uwire_flags);
 254         }
 255         if (machine_is_omap_h6300()) {
 256                 uwire_flags = UWIRE_READ_RISING_EDGE | UWIRE_WRITE_RISING_EDGE;
 257                 omap_cfg_reg(N14_1510_UWIRE_CS0);
 258                 omap_uwire_configure_mode(0, uwire_flags);
 259
 260                 omap_request_gpio(8);
 261                 omap_set_gpio_dataout(8, 0);
 262                 omap_set_gpio_direction (8, 0);
 263         }
 264
 265         /* Configure MCLK enable */
 266         if (cpu_is_omap16xx() || cpu_is_omap1710())
 267                 omap_writel(omap_readl(PU_PD_SEL_2) | (1 << 22), PU_PD_SEL_2);
 268         if (machine_is_omap_h6300()) {
 269                 omap_cfg_reg(V19_1510_UWIRE_SCLK);
 270                 omap_cfg_reg(W21_1510_UWIRE_SDO);
 271                 omap_cfg_reg(U18_1510_UWIRE_SDI);
 272         }
 273
 274         return 0;
 275 }
 276
 277 EXPORT_SYMBOL(omap_tsc2101_enable);
 278 EXPORT_SYMBOL(omap_tsc2101_read);
 279 EXPORT_SYMBOL(omap_tsc2101_reads);
 280 EXPORT_SYMBOL(omap_tsc2101_write);
 281 EXPORT_SYMBOL(omap_tsc2101_disable);
 282
 283 MODULE_AUTHOR("Texas Instruments");
 284 MODULE_DESCRIPTION
 285     ("Glue audio driver for the TI OMAP1610/OMAP1710 TSC2101 codec.");
 286 MODULE_LICENSE("GPL");