target/linux/ramips/patches-3.18/0111-i2c-MIPS-add-mt7621-I2C-driver.patch

   1 Index: linux-3.18.9/drivers/i2c/busses/Kconfig
   2 ===================================================================
   3 --- linux-3.18.9.orig/drivers/i2c/busses/Kconfig        2015-03-23 15:00:11.730403938 +0800
   4 +++ linux-3.18.9/drivers/i2c/busses/Kconfig     2015-03-23 15:00:11.982403926 +0800
   5 @@ -714,6 +714,10 @@
   6         tristate "Ralink I2C Controller"
   7         select OF_I2C
   8
   9 +config I2C_MT7621
  10 +       tristate "MT7621 I2C Controller"
  11 +       select OF_I2C
  12 +
  13  config HAVE_S3C2410_I2C
  14         bool
  15         help
  16 Index: linux-3.18.9/drivers/i2c/busses/Makefile
  17 ===================================================================
  18 --- linux-3.18.9.orig/drivers/i2c/busses/Makefile       2015-03-23 15:00:11.730403938 +0800
  19 +++ linux-3.18.9/drivers/i2c/busses/Makefile    2015-03-23 15:00:11.982403926 +0800
  20 @@ -67,6 +67,7 @@
  21  obj-$(CONFIG_I2C_PXA)          += i2c-pxa.o
  22  obj-$(CONFIG_I2C_PXA_PCI)      += i2c-pxa-pci.o
  23  obj-$(CONFIG_I2C_RALINK)       += i2c-ralink.o
  24 +obj-$(CONFIG_I2C_MT7621)       += i2c-mt7621.o
  25  obj-$(CONFIG_I2C_QUP)          += i2c-qup.o
  26  obj-$(CONFIG_I2C_RIIC)         += i2c-riic.o
  27  obj-$(CONFIG_I2C_RK3X)         += i2c-rk3x.o
  28 Index: linux-3.18.9/drivers/i2c/busses/i2c-mt7621.c
  29 ===================================================================
  30 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  31 +++ linux-3.18.9/drivers/i2c/busses/i2c-mt7621.c        2015-03-23 16:31:42.684747034 +0800
  32 @@ -0,0 +1,303 @@
  33 +/*
  34 + * drivers/i2c/busses/i2c-mt7621.c
  35 + *
  36 + * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.com>
  37 + *
  38 + * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus.
  39 + * (C) 2014 Sittisak <sittisaks@hotmail.com>
  40 + *
  41 + * This software is licensed under the terms of the GNU General Public
  42 + * License version 2, as published by the Free Software Foundation, and
  43 + * may be copied, distributed, and modified under those terms.
  44 + *
  45 + * This program is distributed in the hope that it will be useful,
  46 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  47 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  48 + * GNU General Public License for more details.
  49 + *
  50 + */
  51 +
  52 +#include <linux/interrupt.h>
  53 +#include <linux/kernel.h>
  54 +#include <linux/module.h>
  55 +#include <linux/reset.h>
  56 +#include <linux/delay.h>
  57 +#include <linux/slab.h>
  58 +#include <linux/init.h>
  59 +#include <linux/errno.h>
  60 +#include <linux/platform_device.h>
  61 +#include <linux/i2c.h>
  62 +#include <linux/io.h>
  63 +#include <linux/err.h>
  64 +
  65 +#include <asm/mach-ralink/ralink_regs.h>
  66 +
  67 +#define REG_CONFIG_REG                       0x00
  68 +#define REG_CLKDIV_REG                       0x04
  69 +#define REG_DEVADDR_REG                      0x08
  70 +#define REG_ADDR_REG                         0x0C
  71 +#define REG_DATAOUT_REG                      0x10
  72 +#define REG_DATAIN_REG                       0x14
  73 +#define REG_STATUS_REG                       0x18
  74 +#define REG_STARTXFR_REG                     0x1C
  75 +#define REG_BYTECNT_REG                      0x20
  76 +#define REG_SM0_IS_AUTOMODE                  0x28
  77 +#define REG_SM0CTL0                          0x40
  78 +
  79 +
  80 +#define I2C_STARTERR                         0x10
  81 +#define I2C_ACKERR                           0x08
  82 +#define I2C_DATARDY                          0x04
  83 +#define I2C_SDOEMPTY                         0x02
  84 +#define I2C_BUSY                             0x01
  85 +
  86 +/* I2C_CFG register bit field */
  87 +#define I2C_CFG_ADDRLEN_8                    (7<<5)    /* 8 bits */
  88 +#define I2C_CFG_DEVADLEN_7                   (6<<2)
  89 +#define I2C_CFG_ADDRDIS                      BIT(1)
  90 +#define I2C_CFG_DEVADDIS                     BIT(0)
  91 +
  92 +#define I2C_CFG_DEFAULT        (I2C_CFG_ADDRLEN_8 | \
  93 +               I2C_CFG_DEVADLEN_7 | \
  94 +               I2C_CFG_ADDRDIS)
  95 +
  96 +#define I2C_RETRY                            0x1000
  97 +
  98 +#define CLKDIV_VALUE                         333
  99 +#define i2c_busy_loop                        (CLKDIV_VALUE*30)
 100 +
 101 +#define READ_CMD                             0x01
 102 +#define WRITE_CMD                            0x00
 103 +#define READ_BLOCK                           16
 104 +
 105 +#define SM0_ODRAIN                           BIT(31)
 106 +#define SM0_VSYNC_MODE                       BIT(28)
 107 +#define SM0_CLK_DIV                          (CLKDIV_VALUE << 16)
 108 +#define SM0_WAIT_LEVEL                       BIT(6)
 109 +#define SM0_EN                               BIT(1)
 110 +
 111 +#define SM0_CFG_DEFUALT (SM0_ODRAIN | SM0_VSYNC_MODE | \
 112 +                        SM0_CLK_DIV | SM0_WAIT_LEVEL | \
 113 +                        SM0_EN)
 114 +/***********************************************************/
 115 +
 116 +static void __iomem *membase;
 117 +static struct i2c_adapter *adapter;
 118 +
 119 +static void rt_i2c_w32(u32 val, unsigned reg)
 120 +{
 121 +       iowrite32(val, membase + reg);
 122 +}
 123 +
 124 +static u32 rt_i2c_r32(unsigned reg)
 125 +{
 126 +       return ioread32(membase + reg);
 127 +}
 128 +
 129 +static void mt7621_i2c_reset(struct i2c_adapter *a)
 130 +{
 131 +       device_reset(a->dev.parent);
 132 +}
 133 +static void mt7621_i2c_enable(struct i2c_msg *msg)
 134 +{
 135 +       rt_i2c_w32(msg->addr,REG_DEVADDR_REG);
 136 +       rt_i2c_w32(0,REG_ADDR_REG);
 137 +}
 138 +
 139 +static void i2c_master_init(struct i2c_adapter *a)
 140 +{
 141 +       mt7621_i2c_reset(a);
 142 +       rt_i2c_w32(I2C_CFG_DEFAULT,REG_CONFIG_REG);
 143 +       rt_i2c_w32(SM0_CFG_DEFUALT,REG_SM0CTL0);
 144 +       rt_i2c_w32(1,REG_SM0_IS_AUTOMODE);//auto mode
 145 +}
 146 +
 147 +
 148 +static inline int rt_i2c_wait_rx_done(void)
 149 +{
 150 +       int i=0;
 151 +       while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY)) && (i<i2c_busy_loop))
 152 +               i++;
 153 +       if(i>=i2c_busy_loop){
 154 +               pr_err("err,wait for idle timeout");
 155 +               return -ETIMEDOUT;
 156 +       }
 157 +       return 0;
 158 +}
 159 +
 160 +static inline int rt_i2c_wait_idle(void)
 161 +{
 162 +       int i=0;
 163 +       while((rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY) && (i<i2c_busy_loop))
 164 +               i++;
 165 +       if(i>=i2c_busy_loop){
 166 +               pr_err("err,wait for idle timeout");
 167 +               return -ETIMEDOUT;
 168 +       }
 169 +       return 0;
 170 +}
 171 +
 172 +static inline int rt_i2c_wait_tx_done(void)
 173 +{
 174 +       int i=0;
 175 +       while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY)) && (i<i2c_busy_loop))
 176 +               i++;
 177 +       if(i>=i2c_busy_loop){
 178 +               pr_err("err,wait for idle timeout");
 179 +               return -ETIMEDOUT;
 180 +       }
 181 +       return 0;
 182 +}
 183 +
 184 +static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg)
 185 +{
 186 +       int i = 0, j = 0, pos = 0;
 187 +       int nblock = msg->len / READ_BLOCK;
 188 +       int rem = msg->len % READ_BLOCK;
 189 +
 190 +       if (msg->flags & I2C_M_TEN) {
 191 +               printk("10 bits addr not supported\n");
 192 +               return -EINVAL;
 193 +       }
 194 +
 195 +       if (msg->flags & I2C_M_RD) {
 196 +               for (i = 0; i < nblock; i++) {
 197 +                       if (rt_i2c_wait_idle())
 198 +                               goto err_timeout;
 199 +                       rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG);
 200 +                       rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
 201 +                       for (j = 0; j < READ_BLOCK; j++) {
 202 +                               if (rt_i2c_wait_rx_done())
 203 +                                       goto err_timeout;
 204 +                               msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
 205 +                       }
 206 +               }
 207 +
 208 +               if (rt_i2c_wait_idle())
 209 +                   goto err_timeout;
 210 +               rt_i2c_w32(rem - 1, REG_BYTECNT_REG);
 211 +               rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
 212 +
 213 +               for (i = 0; i < rem; i++) {
 214 +                       if (rt_i2c_wait_rx_done())
 215 +                               goto err_timeout;
 216 +                       msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
 217 +               }
 218 +       } else {
 219 +               if (rt_i2c_wait_idle())
 220 +                       goto err_timeout;
 221 +               rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
 222 +               for (i = 0; i < msg->len; i++) {
 223 +                       rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
 224 +                       if(i == 0)
 225 +                               rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
 226 +
 227 +                       if (rt_i2c_wait_tx_done())
 228 +                               goto err_timeout;
 229 +               }
 230 +       }
 231 +
 232 +       return 0;
 233 +err_timeout:
 234 +       return -ETIMEDOUT;
 235 +}
 236 +
 237 +static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n)
 238 +{
 239 +       int i = 0;
 240 +       int ret = 0;
 241 +       i2c_master_init(a);
 242 +       mt7621_i2c_enable(m);
 243 +
 244 +       for (i = 0; i != n && ret==0; i++) {
 245 +               ret = rt_i2c_handle_msg(a, &m[i]);
 246 +               if (ret)
 247 +                       return ret;
 248 +       }
 249 +       return i;
 250 +}
 251 +
 252 +static u32 rt_i2c_func(struct i2c_adapter *a)
 253 +{
 254 +       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 255 +}
 256 +
 257 +static const struct i2c_algorithm rt_i2c_algo = {
 258 +       .master_xfer    = rt_i2c_master_xfer,
 259 +       .functionality  = rt_i2c_func,
 260 +};
 261 +
 262 +static int rt_i2c_probe(struct platform_device *pdev)
 263 +{
 264 +       struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 265 +       int ret;
 266 +
 267 +       adapter = devm_kzalloc(&pdev->dev,sizeof(struct i2c_adapter), GFP_KERNEL);
 268 +       if (!adapter) {
 269 +               dev_err(&pdev->dev, "failed to allocate i2c_adapter\n");
 270 +               return -ENOMEM;
 271 +       }
 272 +       membase = devm_ioremap_resource(&pdev->dev, res);
 273 +       if (IS_ERR(membase))
 274 +               return PTR_ERR(membase);
 275 +
 276 +       strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name));
 277 +
 278 +       adapter->owner = THIS_MODULE;
 279 +       adapter->nr = pdev->id;
 280 +       adapter->timeout = HZ;
 281 +       adapter->algo = &rt_i2c_algo;
 282 +       adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 283 +       adapter->dev.parent = &pdev->dev;
 284 +       adapter->dev.of_node = pdev->dev.of_node;
 285 +
 286 +       platform_set_drvdata(pdev, adapter);
 287 +
 288 +       ret = i2c_add_numbered_adapter(adapter);
 289 +       if (ret)
 290 +               return ret;
 291 +
 292 +       dev_info(&pdev->dev,"loaded");
 293 +
 294 +       return 0;
 295 +}
 296 +
 297 +static int rt_i2c_remove(struct platform_device *pdev)
 298 +{
 299 +       platform_set_drvdata(pdev, NULL);
 300 +       return 0;
 301 +}
 302 +
 303 +static const struct of_device_id i2c_rt_dt_ids[] = {
 304 +       { .compatible = "ralink,i2c-mt7621", },
 305 +       { /* sentinel */ }
 306 +};
 307 +
 308 +MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
 309 +
 310 +static struct platform_driver rt_i2c_driver = {
 311 +       .probe          = rt_i2c_probe,
 312 +       .remove         = rt_i2c_remove,
 313 +       .driver         = {
 314 +               .owner  = THIS_MODULE,
 315 +               .name   = "i2c-mt7621",
 316 +               .of_match_table = i2c_rt_dt_ids,
 317 +       },
 318 +};
 319 +
 320 +static int __init i2c_rt_init (void)
 321 +{
 322 +       return platform_driver_register(&rt_i2c_driver);
 323 +}
 324 +
 325 +static void __exit i2c_rt_exit (void)
 326 +{
 327 +       platform_driver_unregister(&rt_i2c_driver);
 328 +}
 329 +module_init (i2c_rt_init);
 330 +module_exit (i2c_rt_exit);
 331 +
 332 +MODULE_AUTHOR("Steven Liu <steven_liu@mediatek.com>");
 333 +MODULE_DESCRIPTION("MT7621 I2c host driver");
 334 +MODULE_LICENSE("GPL");
 335 +MODULE_ALIAS("platform:MT7621-I2C");