drivers/mfd/mcp-sa11x0.c

   1 /*
   2  *  linux/drivers/mfd/mcp-sa11x0.c
   3  *
   4  *  Copyright (C) 2001-2005 Russell King
   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 as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  *  SA11x0 MCP (Multimedia Communications Port) driver.
  11  *
  12  *  MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/kernel.h>
  18 #include <linux/delay.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/slab.h>
  21 #include <linux/device.h>
  22
  23 #include <asm/dma.h>
  24 #include <asm/hardware.h>
  25 #include <asm/mach-types.h>
  26 #include <asm/system.h>
  27
  28 #include <asm/arch/assabet.h>
  29
  30 #include "mcp.h"
  31
  32 struct mcp_sa11x0 {
  33         u32     mccr0;
  34         u32     mccr1;
  35 };
  36
  37 #define priv(mcp)       ((struct mcp_sa11x0 *)mcp_priv(mcp))
  38
  39 static void
  40 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
  41 {
  42         unsigned int mccr0;
  43
  44         divisor /= 32;
  45
  46         mccr0 = Ser4MCCR0 & ~0x00007f00;
  47         mccr0 |= divisor << 8;
  48         Ser4MCCR0 = mccr0;
  49 }
  50
  51 static void
  52 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
  53 {
  54         unsigned int mccr0;
  55
  56         divisor /= 32;
  57
  58         mccr0 = Ser4MCCR0 & ~0x0000007f;
  59         mccr0 |= divisor;
  60         Ser4MCCR0 = mccr0;
  61 }
  62
  63 /*
  64  * Write data to the device.  The bit should be set after 3 subframe
  65  * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
  66  * We really should try doing something more productive while we
  67  * wait.
  68  */
  69 static void
  70 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
  71 {
  72         int ret = -ETIME;
  73         int i;
  74
  75         Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
  76
  77         for (i = 0; i < 2; i++) {
  78                 udelay(mcp->rw_timeout);
  79                 if (Ser4MCSR & MCSR_CWC) {
  80                         ret = 0;
  81                         break;
  82                 }
  83         }
  84
  85         if (ret < 0)
  86                 printk(KERN_WARNING "mcp: write timed out\n");
  87 }
  88
  89 /*
  90  * Read data from the device.  The bit should be set after 3 subframe
  91  * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
  92  * We really should try doing something more productive while we
  93  * wait.
  94  */
  95 static unsigned int
  96 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
  97 {
  98         int ret = -ETIME;
  99         int i;
 100
 101         Ser4MCDR2 = reg << 17 | MCDR2_Rd;
 102
 103         for (i = 0; i < 2; i++) {
 104                 udelay(mcp->rw_timeout);
 105                 if (Ser4MCSR & MCSR_CRC) {
 106                         ret = Ser4MCDR2 & 0xffff;
 107                         break;
 108                 }
 109         }
 110
 111         if (ret < 0)
 112                 printk(KERN_WARNING "mcp: read timed out\n");
 113
 114         return ret;
 115 }
 116
 117 static void mcp_sa11x0_enable(struct mcp *mcp)
 118 {
 119         Ser4MCSR = -1;
 120         Ser4MCCR0 |= MCCR0_MCE;
 121 }
 122
 123 static void mcp_sa11x0_disable(struct mcp *mcp)
 124 {
 125         Ser4MCCR0 &= ~MCCR0_MCE;
 126 }
 127
 128 /*
 129  * Our methods.
 130  */
 131 static struct mcp_ops mcp_sa11x0 = {
 132         .set_telecom_divisor    = mcp_sa11x0_set_telecom_divisor,
 133         .set_audio_divisor      = mcp_sa11x0_set_audio_divisor,
 134         .reg_write              = mcp_sa11x0_write,
 135         .reg_read               = mcp_sa11x0_read,
 136         .enable                 = mcp_sa11x0_enable,
 137         .disable                = mcp_sa11x0_disable,
 138 };
 139
 140 static int mcp_sa11x0_probe(struct device *dev)
 141 {
 142         struct platform_device *pdev = to_platform_device(dev);
 143         struct mcp *mcp;
 144         int ret;
 145
 146         if (!machine_is_adsbitsy()       && !machine_is_assabet()        &&
 147             !machine_is_cerf()           && !machine_is_flexanet()       &&
 148             !machine_is_freebird()       && !machine_is_graphicsclient() &&
 149             !machine_is_graphicsmaster() && !machine_is_lart()           &&
 150             !machine_is_omnimeter()      && !machine_is_pfs168()         &&
 151             !machine_is_shannon()        && !machine_is_simpad()         &&
 152             !machine_is_yopy())
 153                 return -ENODEV;
 154
 155         if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
 156                 return -EBUSY;
 157
 158         mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
 159         if (!mcp) {
 160                 ret = -ENOMEM;
 161                 goto release;
 162         }
 163
 164         mcp->owner              = THIS_MODULE;
 165         mcp->ops                = &mcp_sa11x0;
 166         mcp->sclk_rate          = 11981000,
 167         mcp->dma_audio_rd       = DMA_Ser4MCP0Rd;
 168         mcp->dma_audio_wr       = DMA_Ser4MCP0Wr;
 169         mcp->dma_telco_rd       = DMA_Ser4MCP1Rd;
 170         mcp->dma_telco_wr       = DMA_Ser4MCP1Wr;
 171
 172         dev_set_drvdata(dev, mcp);
 173
 174         if (machine_is_assabet()) {
 175                 ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
 176         }
 177
 178         /*
 179          * Setup the PPC unit correctly.
 180          */
 181         PPDR &= ~PPC_RXD4;
 182         PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
 183         PSDR |= PPC_RXD4;
 184         PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
 185         PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
 186
 187         Ser4MCSR = -1;
 188         Ser4MCCR1 = 0;
 189         Ser4MCCR0 = 0x00007f7f | MCCR0_ADM;
 190
 191         /*
 192          * Calculate the read/write timeout (us) from the bit clock
 193          * rate.  This is the period for 3 64-bit frames.  Always
 194          * round this time up.
 195          */
 196         mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
 197                           mcp->sclk_rate;
 198
 199         ret = mcp_host_register(mcp);
 200         if (ret == 0)
 201                 goto out;
 202
 203  release:
 204         release_mem_region(0x80060000, 0x60);
 205         dev_set_drvdata(dev, NULL);
 206
 207  out:
 208         return ret;
 209 }
 210
 211 static int mcp_sa11x0_remove(struct device *dev)
 212 {
 213         struct mcp *mcp = dev_get_drvdata(dev);
 214
 215         dev_set_drvdata(dev, NULL);
 216         mcp_host_unregister(mcp);
 217         release_mem_region(0x80060000, 0x60);
 218
 219         return 0;
 220 }
 221
 222 static int mcp_sa11x0_suspend(struct device *dev, pm_message_t state, u32 level)
 223 {
 224         struct mcp *mcp = dev_get_drvdata(dev);
 225
 226         if (level == SUSPEND_DISABLE) {
 227                 priv(mcp)->mccr0 = Ser4MCCR0;
 228                 priv(mcp)->mccr1 = Ser4MCCR1;
 229                 Ser4MCCR0 &= ~MCCR0_MCE;
 230         }
 231         return 0;
 232 }
 233
 234 static int mcp_sa11x0_resume(struct device *dev, u32 level)
 235 {
 236         struct mcp *mcp = dev_get_drvdata(dev);
 237
 238         if (level == RESUME_RESTORE_STATE) {
 239                 Ser4MCCR1 = priv(mcp)->mccr1;
 240                 Ser4MCCR0 = priv(mcp)->mccr0;
 241         }
 242         return 0;
 243 }
 244
 245 /*
 246  * The driver for the SA11x0 MCP port.
 247  */
 248 static struct device_driver mcp_sa11x0_driver = {
 249         .name           = "sa11x0-mcp",
 250         .bus            = &platform_bus_type,
 251         .probe          = mcp_sa11x0_probe,
 252         .remove         = mcp_sa11x0_remove,
 253         .suspend        = mcp_sa11x0_suspend,
 254         .resume         = mcp_sa11x0_resume,
 255 };
 256
 257 /*
 258  * This needs re-working
 259  */
 260 static int __init mcp_sa11x0_init(void)
 261 {
 262         return driver_register(&mcp_sa11x0_driver);
 263 }
 264
 265 static void __exit mcp_sa11x0_exit(void)
 266 {
 267         driver_unregister(&mcp_sa11x0_driver);
 268 }
 269
 270 module_init(mcp_sa11x0_init);
 271 module_exit(mcp_sa11x0_exit);
 272
 273 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 274 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
 275 MODULE_LICENSE("GPL");