drivers/mfd/rk616-core.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/delay.h>
   5 #include <linux/mfd/core.h>
   6 #include <linux/slab.h>
   7 #include <linux/mfd/rk616.h>
   8 #include <linux/clk.h>
   9 #include <mach/iomux.h>
  10 #include <linux/err.h>
  11 #include <linux/uaccess.h>
  12 #if defined(CONFIG_DEBUG_FS)
  13 #include <linux/fs.h>
  14 #include <linux/debugfs.h>
  15 #include <linux/seq_file.h>
  16 #endif
  17
  18 #ifndef MHZ
  19 #define MHZ (1000*1000)
  20 #endif
  21
  22 static struct mfd_cell rk616_devs[] = {
  23         {
  24                 .name = "rk616-lvds",
  25                 .id = 0,
  26         },
  27         {
  28                 .name = "rk616-codec",
  29                 .id = 1,
  30         },
  31         {
  32                 .name = "rk616-hdmi",
  33                 .id = 2,
  34         },
  35         {
  36                 .name = "rk616-mipi",
  37                 .id = 3,
  38         },
  39 };
  40
  41 static int rk616_i2c_read_reg(struct mfd_rk616 *rk616, u16 reg,u32 *pval)
  42 {
  43         struct i2c_client * client = rk616->client;
  44         struct i2c_adapter *adap = client->adapter;
  45         struct i2c_msg msgs[2];
  46         int ret;
  47         char reg_buf[2];
  48
  49         memcpy(reg_buf, &reg, 2);
  50
  51         msgs[0].addr = client->addr;
  52         msgs[0].flags = client->flags;
  53         msgs[0].len = 2;
  54         msgs[0].buf = reg_buf;
  55         msgs[0].scl_rate = rk616->pdata->scl_rate;
  56         msgs[0].udelay = client->udelay;
  57
  58         msgs[1].addr = client->addr;
  59         msgs[1].flags = client->flags | I2C_M_RD;
  60         msgs[1].len = 4;
  61         msgs[1].buf = (char *)pval;
  62         msgs[1].scl_rate = rk616->pdata->scl_rate;
  63         msgs[1].udelay = client->udelay;
  64
  65         ret = i2c_transfer(adap, msgs, 2);
  66
  67
  68         return (ret == 2)? 4 : ret;
  69
  70 }
  71
  72 static int rk616_i2c_write_reg(struct mfd_rk616 *rk616, u16 reg,u32 *pval)
  73 {
  74         struct i2c_client *client = rk616->client;
  75         struct i2c_adapter *adap = client->adapter;
  76         struct i2c_msg msg;
  77         int ret;
  78         char *tx_buf = (char *)kmalloc(6, GFP_KERNEL);
  79         if(!tx_buf)
  80                 return -ENOMEM;
  81
  82         memcpy(tx_buf, &reg, 2);
  83         memcpy(tx_buf+2, (char *)pval, 4);
  84
  85         msg.addr = client->addr;
  86         msg.flags = client->flags;
  87         msg.len = 6;
  88         msg.buf = (char *)tx_buf;
  89         msg.scl_rate = rk616->pdata->scl_rate;
  90         msg.udelay = client->udelay;
  91
  92         ret = i2c_transfer(adap, &msg, 1);
  93         kfree(tx_buf);
  94
  95
  96         return (ret == 1) ? 4 : ret;
  97 }
  98
  99
 100 #if defined(CONFIG_DEBUG_FS)
 101 static int rk616_reg_show(struct seq_file *s, void *v)
 102 {
 103         int i = 0;
 104         u32 val = 0;
 105         struct mfd_rk616 *rk616 = s->private;
 106         if(!rk616)
 107         {
 108                 dev_err(rk616->dev,"no mfd rk616!\n");
 109                 return 0;
 110         }
 111
 112         for(i=0;i<= CRU_CFGMISC_CON;i+=4)
 113         {
 114                 rk616->read_dev(rk616,i,&val);
 115                 seq_printf(s,"0x%04x>>0x%08x\n",i,val);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static ssize_t rk616_reg_write (struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 122 {
 123         struct mfd_rk616 *rk616 = file->f_path.dentry->d_inode->i_private;
 124         u32 reg;
 125         u32 val;
 126         char kbuf[25];
 127         if (copy_from_user(kbuf, buf, count))
 128                 return -EFAULT;
 129         sscanf(kbuf, "%x%x", &reg,&val);
 130         dev_dbg(rk616->dev,"%s:reg:0x%04x val:0x%08x\n",__func__,reg,val);
 131         rk616->write_dev(rk616,reg,&val);
 132         return count;
 133 }
 134
 135 static int rk616_reg_open(struct inode *inode, struct file *file)
 136 {
 137         struct mfd_rk616 *rk616 = inode->i_private;
 138         return single_open(file,rk616_reg_show,rk616);
 139 }
 140
 141 static const struct file_operations rk616_reg_fops = {
 142         .owner          = THIS_MODULE,
 143         .open           = rk616_reg_open,
 144         .read           = seq_read,
 145         .write          = rk616_reg_write,
 146         .llseek         = seq_lseek,
 147         .release        = single_release,
 148 };
 149 #endif
 150
 151
 152 static u32 rk616_clk_gcd(u32 numerator, u32 denominator)
 153 {
 154         u32 a, b;
 155
 156         if (!numerator || !denominator)
 157                 return 0;
 158
 159         if (numerator > denominator) {
 160                 a = numerator;
 161                 b = denominator;
 162         } else {
 163                 a = denominator;
 164                 b = numerator;
 165         }
 166
 167         while (b != 0) {
 168                 int r = b;
 169                 b = a % b;
 170                 a = r;
 171         }
 172
 173         return a;
 174 }
 175
 176
 177 static int rk616_pll_clk_get_set(struct mfd_rk616 *rk616,unsigned long fin_hz,unsigned long fout_hz,
 178                                         u32 *refdiv, u32 *fbdiv, u32 *postdiv1, u32 *postdiv2, u32 *frac)
 179 {
 180         // FIXME set postdiv1/2 always 1
 181         u32 gcd;
 182         u64 fin_64, frac_64;
 183         u32 f_frac;
 184         if(!fin_hz || !fout_hz || fout_hz == fin_hz)
 185                 return -1;
 186
 187         if(fin_hz / MHZ * MHZ == fin_hz && fout_hz /MHZ * MHZ == fout_hz)
 188         {
 189                 fin_hz /= MHZ;
 190                 fout_hz /= MHZ;
 191                 gcd = rk616_clk_gcd(fin_hz, fout_hz);
 192                 *refdiv = fin_hz / gcd;
 193                 *fbdiv = fout_hz / gcd;
 194                 *postdiv1 = 1;
 195                 *postdiv2 = 1;
 196
 197                 *frac = 0;
 198
 199                 dev_info(rk616->dev,"fin=%lu,fout=%lu,gcd=%u,refdiv=%u,fbdiv=%u,postdiv1=%u,postdiv2=%u,frac=%u\n",
 200                                 fin_hz, fout_hz, gcd, *refdiv, *fbdiv, *postdiv1, *postdiv2, *frac);
 201         }
 202         else
 203         {
 204                 dev_info(rk616->dev,"******frac div running, fin_hz=%lu, fout_hz=%lu, fin_mhz=%lu, fout_mhz=%lu\n",
 205                                 fin_hz, fout_hz, fin_hz / MHZ * MHZ, fout_hz / MHZ * MHZ);
 206                 gcd = rk616_clk_gcd(fin_hz / MHZ, fout_hz / MHZ);
 207                 *refdiv = fin_hz / MHZ / gcd;
 208                 *fbdiv = fout_hz / MHZ / gcd;
 209                 *postdiv1 = 1;
 210                 *postdiv2 = 1;
 211
 212                 *frac = 0;
 213
 214                 f_frac = (fout_hz % MHZ);
 215                 fin_64 = fin_hz;
 216                 do_div(fin_64, (u64)*refdiv);
 217                 frac_64 = (u64)f_frac << 24;
 218                 do_div(frac_64, fin_64);
 219                 *frac = (u32) frac_64;
 220                 dev_dbg(rk616->dev,"frac_64=%llx, frac=%u\n", frac_64, *frac);
 221         }
 222         return 0;
 223 }
 224
 225 /***********************************
 226 default clk patch settiing:
 227 CLKIN-------->CODEC
 228 LCD_DCLK0--->PLL0--->Dither--->LVDS/MIPI
 229 LCD_DCLK1--->PLL1--->HDMI
 230 ************************************/
 231
 232 static int rk616_clk_common_init(struct mfd_rk616 *rk616)
 233 {
 234         u32 val = 0;
 235         int ret;
 236
 237         val = PLL1_CLK_SEL(1) | PLL0_CLK_SEL(0) | LCD1_CLK_DIV(0) | LCD0_CLK_DIV(0) |
 238                 PLL1_CLK_SEL_MASK | PLL0_CLK_SEL_MASK | LCD1_CLK_DIV_MASK |
 239                 LCD0_CLK_DIV_MASK; //pll1 clk from lcdc1_dclk,pll0 clk from lcdc0_dclk,mux_lcdx = lcdx_clk
 240         ret = rk616->write_dev(rk616,CRU_CLKSEL0_CON,&val);
 241
 242         val = CODEC_MCLK_SEL(2) | CODEC_MCLK_SEL_MASK; //codec mclk from clkin
 243         ret = rk616->write_dev(rk616,CRU_CLKSEL1_CON,&val);
 244
 245         val = 0; //codec mck = clkin
 246         ret = rk616->write_dev(rk616,CRU_CODEC_DIV,&val);
 247
 248         val = (PLL0_BYPASS) | (PLL0_BYPASS << 16);  //bypass pll0
 249         ret = rk616->write_dev(rk616,CRU_PLL0_CON0,&val);
 250
 251         val = (PLL1_BYPASS) | (PLL1_BYPASS << 16);
 252         ret = rk616->write_dev(rk616,CRU_PLL1_CON0,&val);
 253
 254         return 0;
 255 }
 256 static int rk616_i2c_probe(struct i2c_client *client,const struct i2c_device_id *id)
 257 {
 258         int ret;
 259         struct mfd_rk616 *rk616 = NULL;
 260         struct clk *iis_clk;
 261
 262         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 263         {
 264                 dev_err(&client->dev, "Must have I2C_FUNC_I2C.\n");
 265                 ret = -ENODEV;
 266         }
 267         rk616 = kzalloc(sizeof(struct mfd_rk616), GFP_KERNEL);
 268         if (rk616 == NULL)
 269         {
 270                 printk(KERN_ALERT "alloc for struct rk616 fail\n");
 271                 ret = -ENOMEM;
 272         }
 273
 274         rk616->dev = &client->dev;
 275         rk616->pdata = client->dev.platform_data;
 276         rk616->client = client;
 277         i2c_set_clientdata(client, rk616);
 278         dev_set_drvdata(rk616->dev,rk616);
 279
 280         if(rk616->pdata->power_init)
 281                 rk616->pdata->power_init();
 282
 283 #if defined(CONFIG_SND_RK29_SOC_I2S_8CH)
 284         iis_clk = clk_get_sys("rk29_i2s.0", "i2s");
 285 #elif defined(CONFIG_SND_RK29_SOC_I2S_2CH)
 286         iis_clk = clk_get_sys("rk29_i2s.1", "i2s");
 287 #else
 288         iis_clk = clk_get_sys("rk29_i2s.2", "i2s");
 289 #endif
 290         if (IS_ERR(iis_clk))
 291         {
 292                 dev_err(&client->dev,"failed to get i2s clk\n");
 293                 ret = PTR_ERR(iis_clk);
 294         }
 295         else
 296         {
 297                 #if defined(CONFIG_ARCH_RK29)
 298                 rk29_mux_api_set(GPIO2D0_I2S0CLK_MIIRXCLKIN_NAME, GPIO2H_I2S0_CLK);
 299                 #else
 300                 iomux_set(I2S0_CLK);
 301                 #endif
 302                 clk_enable(iis_clk);
 303                 clk_set_rate(iis_clk, 11289600);
 304                 clk_put(iis_clk);
 305         }
 306         rk616->read_dev = rk616_i2c_read_reg;
 307         rk616->write_dev = rk616_i2c_write_reg;
 308 #if defined(CONFIG_DEBUG_FS)
 309         rk616->debugfs_dir = debugfs_create_dir("rk616", NULL);
 310         if (IS_ERR(rk616->debugfs_dir))
 311         {
 312                 dev_err(rk616->dev,"failed to create debugfs dir for rk616!\n");
 313         }
 314         else
 315                 debugfs_create_file("rk616-core", S_IRUSR,rk616->debugfs_dir,rk616,&rk616_reg_fops);
 316 #endif
 317         rk616_clk_common_init(rk616);
 318         ret = mfd_add_devices(rk616->dev, -1,
 319                                       rk616_devs, ARRAY_SIZE(rk616_devs),
 320                                       NULL, rk616->irq_base);
 321
 322         dev_info(&client->dev,"rk616 core probe success!\n");
 323         return 0;
 324 }
 325
 326 static int __devexit rk616_i2c_remove(struct i2c_client *client)
 327 {
 328         return 0;
 329 }
 330
 331 static const struct i2c_device_id id_table[] = {
 332         {"rk616", 0 },
 333         { }
 334 };
 335
 336 static struct i2c_driver rk616_i2c_driver  = {
 337         .driver = {
 338                 .name  = "rk616",
 339                 .owner = THIS_MODULE,
 340         },
 341         .probe          = &rk616_i2c_probe,
 342         .remove         = &rk616_i2c_remove,
 343         .id_table       = id_table,
 344 };
 345
 346
 347 static int __init rk616_module_init(void)
 348 {
 349         return i2c_add_driver(&rk616_i2c_driver);
 350 }
 351
 352 static void __exit rk616_module_exit(void)
 353 {
 354         i2c_del_driver(&rk616_i2c_driver);
 355 }
 356
 357 subsys_initcall_sync(rk616_module_init);
 358 module_exit(rk616_module_exit);
 359
 360