drivers/mfd/mcp-sa11x0.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/mfd/mcp-sa11x0.c
   4  *
   5  *  Copyright (C) 2001-2005 Russell King
   6  *
   7  *  SA11x0 MCP (Multimedia Communications Port) driver.
   8  *
   9  *  MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/io.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/delay.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm.h>
  19 #include <linux/mfd/mcp.h>
  20
  21 #include <mach/hardware.h>
  22 #include <asm/mach-types.h>
  23 #include <linux/platform_data/mfd-mcp-sa11x0.h>
  24
  25 #define DRIVER_NAME "sa11x0-mcp"
  26
  27 struct mcp_sa11x0 {
  28         void __iomem    *base0;
  29         void __iomem    *base1;
  30         u32             mccr0;
  31         u32             mccr1;
  32 };
  33
  34 /* Register offsets */
  35 #define MCCR0(m)        ((m)->base0 + 0x00)
  36 #define MCDR0(m)        ((m)->base0 + 0x08)
  37 #define MCDR1(m)        ((m)->base0 + 0x0c)
  38 #define MCDR2(m)        ((m)->base0 + 0x10)
  39 #define MCSR(m)         ((m)->base0 + 0x18)
  40 #define MCCR1(m)        ((m)->base1 + 0x00)
  41
  42 #define priv(mcp)       ((struct mcp_sa11x0 *)mcp_priv(mcp))
  43
  44 static void
  45 mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
  46 {
  47         struct mcp_sa11x0 *m = priv(mcp);
  48
  49         divisor /= 32;
  50
  51         m->mccr0 &= ~0x00007f00;
  52         m->mccr0 |= divisor << 8;
  53         writel_relaxed(m->mccr0, MCCR0(m));
  54 }
  55
  56 static void
  57 mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
  58 {
  59         struct mcp_sa11x0 *m = priv(mcp);
  60
  61         divisor /= 32;
  62
  63         m->mccr0 &= ~0x0000007f;
  64         m->mccr0 |= divisor;
  65         writel_relaxed(m->mccr0, MCCR0(m));
  66 }
  67
  68 /*
  69  * Write data to the device.  The bit should be set after 3 subframe
  70  * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
  71  * We really should try doing something more productive while we
  72  * wait.
  73  */
  74 static void
  75 mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
  76 {
  77         struct mcp_sa11x0 *m = priv(mcp);
  78         int ret = -ETIME;
  79         int i;
  80
  81         writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
  82
  83         for (i = 0; i < 2; i++) {
  84                 udelay(mcp->rw_timeout);
  85                 if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
  86                         ret = 0;
  87                         break;
  88                 }
  89         }
  90
  91         if (ret < 0)
  92                 printk(KERN_WARNING "mcp: write timed out\n");
  93 }
  94
  95 /*
  96  * Read data from the device.  The bit should be set after 3 subframe
  97  * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
  98  * We really should try doing something more productive while we
  99  * wait.
 100  */
 101 static unsigned int
 102 mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
 103 {
 104         struct mcp_sa11x0 *m = priv(mcp);
 105         int ret = -ETIME;
 106         int i;
 107
 108         writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
 109
 110         for (i = 0; i < 2; i++) {
 111                 udelay(mcp->rw_timeout);
 112                 if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
 113                         ret = readl_relaxed(MCDR2(m)) & 0xffff;
 114                         break;
 115                 }
 116         }
 117
 118         if (ret < 0)
 119                 printk(KERN_WARNING "mcp: read timed out\n");
 120
 121         return ret;
 122 }
 123
 124 static void mcp_sa11x0_enable(struct mcp *mcp)
 125 {
 126         struct mcp_sa11x0 *m = priv(mcp);
 127
 128         writel(-1, MCSR(m));
 129         m->mccr0 |= MCCR0_MCE;
 130         writel_relaxed(m->mccr0, MCCR0(m));
 131 }
 132
 133 static void mcp_sa11x0_disable(struct mcp *mcp)
 134 {
 135         struct mcp_sa11x0 *m = priv(mcp);
 136
 137         m->mccr0 &= ~MCCR0_MCE;
 138         writel_relaxed(m->mccr0, MCCR0(m));
 139 }
 140
 141 /*
 142  * Our methods.
 143  */
 144 static struct mcp_ops mcp_sa11x0 = {
 145         .set_telecom_divisor    = mcp_sa11x0_set_telecom_divisor,
 146         .set_audio_divisor      = mcp_sa11x0_set_audio_divisor,
 147         .reg_write              = mcp_sa11x0_write,
 148         .reg_read               = mcp_sa11x0_read,
 149         .enable                 = mcp_sa11x0_enable,
 150         .disable                = mcp_sa11x0_disable,
 151 };
 152
 153 static int mcp_sa11x0_probe(struct platform_device *dev)
 154 {
 155         struct mcp_plat_data *data = dev_get_platdata(&dev->dev);
 156         struct resource *mem0, *mem1;
 157         struct mcp_sa11x0 *m;
 158         struct mcp *mcp;
 159         int ret;
 160
 161         if (!data)
 162                 return -ENODEV;
 163
 164         mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
 165         mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
 166         if (!mem0 || !mem1)
 167                 return -ENXIO;
 168
 169         if (!request_mem_region(mem0->start, resource_size(mem0),
 170                                 DRIVER_NAME)) {
 171                 ret = -EBUSY;
 172                 goto err_mem0;
 173         }
 174
 175         if (!request_mem_region(mem1->start, resource_size(mem1),
 176                                 DRIVER_NAME)) {
 177                 ret = -EBUSY;
 178                 goto err_mem1;
 179         }
 180
 181         mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
 182         if (!mcp) {
 183                 ret = -ENOMEM;
 184                 goto err_alloc;
 185         }
 186
 187         mcp->owner              = THIS_MODULE;
 188         mcp->ops                = &mcp_sa11x0;
 189         mcp->sclk_rate          = data->sclk_rate;
 190
 191         m = priv(mcp);
 192         m->mccr0 = data->mccr0 | 0x7f7f;
 193         m->mccr1 = data->mccr1;
 194
 195         m->base0 = ioremap(mem0->start, resource_size(mem0));
 196         m->base1 = ioremap(mem1->start, resource_size(mem1));
 197         if (!m->base0 || !m->base1) {
 198                 ret = -ENOMEM;
 199                 goto err_ioremap;
 200         }
 201
 202         platform_set_drvdata(dev, mcp);
 203
 204         /*
 205          * Initialise device.  Note that we initially
 206          * set the sampling rate to minimum.
 207          */
 208         writel_relaxed(-1, MCSR(m));
 209         writel_relaxed(m->mccr1, MCCR1(m));
 210         writel_relaxed(m->mccr0, MCCR0(m));
 211
 212         /*
 213          * Calculate the read/write timeout (us) from the bit clock
 214          * rate.  This is the period for 3 64-bit frames.  Always
 215          * round this time up.
 216          */
 217         mcp->rw_timeout = DIV_ROUND_UP(64 * 3 * 1000000, mcp->sclk_rate);
 218
 219         ret = mcp_host_add(mcp, data->codec_pdata);
 220         if (ret == 0)
 221                 return 0;
 222
 223  err_ioremap:
 224         iounmap(m->base1);
 225         iounmap(m->base0);
 226         mcp_host_free(mcp);
 227  err_alloc:
 228         release_mem_region(mem1->start, resource_size(mem1));
 229  err_mem1:
 230         release_mem_region(mem0->start, resource_size(mem0));
 231  err_mem0:
 232         return ret;
 233 }
 234
 235 static void mcp_sa11x0_remove(struct platform_device *dev)
 236 {
 237         struct mcp *mcp = platform_get_drvdata(dev);
 238         struct mcp_sa11x0 *m = priv(mcp);
 239         struct resource *mem0, *mem1;
 240
 241         if (m->mccr0 & MCCR0_MCE)
 242                 dev_warn(&dev->dev,
 243                          "device left active (missing disable call?)\n");
 244
 245         mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
 246         mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
 247
 248         mcp_host_del(mcp);
 249         iounmap(m->base1);
 250         iounmap(m->base0);
 251         mcp_host_free(mcp);
 252         release_mem_region(mem1->start, resource_size(mem1));
 253         release_mem_region(mem0->start, resource_size(mem0));
 254 }
 255
 256 static int mcp_sa11x0_suspend(struct device *dev)
 257 {
 258         struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
 259
 260         if (m->mccr0 & MCCR0_MCE)
 261                 dev_warn(dev, "device left active (missing disable call?)\n");
 262
 263         writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
 264
 265         return 0;
 266 }
 267
 268 static int mcp_sa11x0_resume(struct device *dev)
 269 {
 270         struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
 271
 272         writel_relaxed(m->mccr1, MCCR1(m));
 273         writel_relaxed(m->mccr0, MCCR0(m));
 274
 275         return 0;
 276 }
 277
 278 static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
 279         .suspend = mcp_sa11x0_suspend,
 280         .freeze = mcp_sa11x0_suspend,
 281         .poweroff = mcp_sa11x0_suspend,
 282         .resume_noirq = mcp_sa11x0_resume,
 283         .thaw_noirq = mcp_sa11x0_resume,
 284         .restore_noirq = mcp_sa11x0_resume,
 285 };
 286
 287 static struct platform_driver mcp_sa11x0_driver = {
 288         .probe          = mcp_sa11x0_probe,
 289         .remove         = mcp_sa11x0_remove,
 290         .driver         = {
 291                 .name   = DRIVER_NAME,
 292                 .pm     = pm_sleep_ptr(&mcp_sa11x0_pm_ops),
 293         },
 294 };
 295
 296 /*
 297  * This needs re-working
 298  */
 299 module_platform_driver(mcp_sa11x0_driver);
 300
 301 MODULE_ALIAS("platform:" DRIVER_NAME);
 302 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 303 MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
 304 MODULE_LICENSE("GPL");