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
  27 #include <asm/system.h>
  28 #include <asm/irq.h>
  29 #include <asm/io.h>
  30 #include <asm/mach-types.h>
  31 #include <asm/hardware.h>
  32 #include <asm/hardware/clock.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
  40 #include "omap-tsc2101.h"
  41
  42 #if CONFIG_ARCH_OMAP16XX
  43 #include <../drivers/ssi/omap-uwire.h>
  44 #else
  45 #error "Unsupported configuration"
  46 #endif
  47
  48 #define SPIO 1
  49
  50 static int count;
  51 static spinlock_t tsc2101_lock = SPIN_LOCK_UNLOCKED;
  52 static struct clk  * tsc2101_mclk_ck;
  53
  54 static int omap_tsc2101_configure(void);
  55
  56 /* FIXME: add driver model usage to powerdown the tsc2101 on suspend */
  57 /* Clock  -Hard coding for the time being */
  58 #define CLK_SOFT_REQ_REG_BASE  (0xFFFE0800+0x34)
  59 #define SOFT_COM_MCK0_REQ_MASK (0x1<<6)
  60
  61 int omap_tsc2101_enable(void)
  62 {
  63         int ret = 0;
  64
  65         spin_lock(&tsc2101_lock);
  66         if (count++ == 0) {
  67                 int ret = 0;
  68                 /* set the Mux to provide MCLK to TSC2101 */
  69                 if (machine_is_omap_h3()) {
  70                         ret = omap_cfg_reg(V5_1710_MCLK_ON);
  71                 } else {
  72                         if (machine_is_omap_h2()) {
  73                                 ret = omap_cfg_reg(R10_1610_MCLK_ON);
  74                         }
  75                 }
  76
  77                 /* Get the MCLK */
  78                 tsc2101_mclk_ck = clk_get(NULL, "mclk");
  79                 if (NULL == tsc2101_mclk_ck) {
  80                         printk(KERN_ERR "Unable to get the clock MCLK!!!\n");;
  81                         ret = -EPERM;
  82                         goto done;
  83                 }
  84                 if (clk_set_rate(tsc2101_mclk_ck, 12000000)) {
  85                         printk(KERN_ERR "Unable to set rate to the MCLK!!!\n");;
  86                         ret = -EPERM;
  87                         goto done;
  88                 }
  89                 clk_enable(tsc2101_mclk_ck);
  90
  91                 ret = omap_tsc2101_configure();
  92
  93                 /* Lock the module */
  94                 if (!ret && !try_module_get(THIS_MODULE)) {
  95                         printk(KERN_CRIT "Failed to get TSC module\n");
  96                         ret = -ESTALE;
  97                 }
  98         }
  99
 100 done:
 101         spin_unlock(&tsc2101_lock);
 102         return ret;
 103 }
 104
 105 void omap_tsc2101_disable(void)
 106 {
 107         spin_lock(&tsc2101_lock);
 108         if (--count == 0) {
 109                 int ret = 0;
 110                 /* Remove the Mux to Stop MCLK to TSC2101 */
 111                 if (machine_is_omap_h3()) {
 112                         ret = omap_cfg_reg(V5_1710_MCLK_OFF);
 113                 } else {
 114                         if (machine_is_omap_h2()) {
 115                                 ret = omap_cfg_reg(R10_1610_MCLK_OFF);
 116                         }
 117                 }
 118
 119                 /* Release the MCLK */
 120                 clk_disable(tsc2101_mclk_ck);
 121                 clk_put(tsc2101_mclk_ck);
 122                 tsc2101_mclk_ck = NULL;
 123
 124                 module_put(THIS_MODULE);
 125         }
 126         spin_unlock(&tsc2101_lock);
 127 }
 128
 129 void omap_tsc2101_write(int page, u8 address, u16 data)
 130 {
 131
 132         int ret = 0;
 133
 134         if (machine_is_omap_h2()) {
 135                 ret =
 136                     omap_uwire_data_transfer(1,
 137                                              (((page) << 11) | (address << 5)),
 138                                              16, 0, NULL, 1);
 139                 if (ret) {
 140                         printk(KERN_ERR
 141                                "uwire-write returned error for address %x\n",
 142                                address);
 143                         return;
 144                 }
 145                 ret = omap_uwire_data_transfer(1, data, 16, 0, NULL, 0);
 146                 if (ret) {
 147                         printk(KERN_ERR
 148                                "uwire-write returned error for address %x\n",
 149                                address);
 150                         return;
 151                 }
 152         }
 153         if (machine_is_omap_h3()) {
 154
 155                 ret =
 156                     omap_uwire_data_transfer(0, ((page << 11) | (address << 5)),
 157                                              16, 0, NULL, 1);
 158                 if (ret) {
 159                         printk(KERN_ERR
 160                                "uwire-write returned error for address %x\n",
 161                                address);
 162                         return;
 163                 }
 164                 ret = omap_uwire_data_transfer(0, data, 16, 0, NULL, 0);
 165                 if (ret) {
 166                         printk(KERN_ERR
 167                                "uwire-write returned error for address %x\n",
 168                                address);
 169                         return;
 170                 }
 171         }
 172
 173 }
 174
 175 void omap_tsc2101_reads(int page, u8 startaddress, u16 * data, int numregs)
 176 {
 177         int cs = 0, i;
 178         if (machine_is_omap_h2()) {
 179                 cs = 1;
 180         }
 181         if (machine_is_omap_h3()) {
 182                 cs = 0;
 183         }
 184         (void)omap_uwire_data_transfer(cs, (0x8000 | (page << 11)
 185                                             | (startaddress << 5)),
 186                                        16, 0, NULL, 1);
 187         for (i = 0; i < (numregs - 1); i++, data++) {
 188                 omap_uwire_data_transfer(cs, 0, 0, 16, data, 1);
 189         }
 190         omap_uwire_data_transfer(cs, 0, 0, 16, data, 0);
 191 }
 192
 193 u16 omap_tsc2101_read(int page, u8 address)
 194 {
 195         u16 ret;
 196         omap_tsc2101_reads(page, address, &ret, 1);
 197         return ret;
 198 }
 199
 200 /* FIXME: adapt clock divisors for uwire to current ARM xor clock rate */
 201 static int omap_tsc2101_configure(void)
 202 {
 203         unsigned long uwire_flags = 0;
 204
 205 #if CONFIG_MACH_OMAP_H3
 206         int err = 0;
 207         u8 ioExpanderVal = 0;
 208
 209         if ((err = read_gpio_expa(&ioExpanderVal, 0x24))) {
 210                 printk(" Error reading from I/O EXPANDER \n");
 211                 return err;
 212         }
 213         ioExpanderVal |= 0x8;
 214
 215         if ((err = write_gpio_expa(ioExpanderVal, 0x24))) {
 216                 printk(KERN_ERR ": Error writing to I/O EXPANDER \n");
 217                 return err;
 218         }
 219 #endif
 220
 221         if (machine_is_omap_h2()) {
 222                 uwire_flags = UWIRE_READ_RISING_EDGE | UWIRE_WRITE_RISING_EDGE;
 223                 omap_cfg_reg(N15_1610_UWIRE_CS1);
 224                 omap_uwire_configure_mode(1, uwire_flags);
 225         }
 226         if (machine_is_omap_h3()) {
 227                 uwire_flags = UWIRE_READ_RISING_EDGE | UWIRE_WRITE_RISING_EDGE;
 228                 omap_cfg_reg(N14_1610_UWIRE_CS0);
 229                 omap_uwire_configure_mode(0, uwire_flags);
 230         }
 231
 232         /* Configure MCLK enable */
 233         omap_writel(omap_readl(PU_PD_SEL_2) | (1 << 22), PU_PD_SEL_2);
 234
 235         return 0;
 236 }
 237
 238 EXPORT_SYMBOL(omap_tsc2101_enable);
 239 EXPORT_SYMBOL(omap_tsc2101_read);
 240 EXPORT_SYMBOL(omap_tsc2101_reads);
 241 EXPORT_SYMBOL(omap_tsc2101_write);
 242 EXPORT_SYMBOL(omap_tsc2101_disable);
 243
 244 MODULE_AUTHOR("Texas Instruments");
 245 MODULE_DESCRIPTION
 246     ("Glue audio driver for the TI OMAP1610/OMAP1710 TSC2101 codec.");
 247 MODULE_LICENSE("GPL");