Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Provides I2C support for Philips PNX010x/PNX4008 boards. |
| 3 | * |
| 4 | * Authors: Dennis Kovalev <dkovalev@ru.mvista.com> |
| 5 | * Vitaly Wool <vwool@ru.mvista.com> |
| 6 | * |
| 7 | * 2004-2006 (c) MontaVista Software, Inc. This file is licensed under |
| 8 | * the terms of the GNU General Public License version 2. This program |
| 9 | * is licensed "as is" without any warranty of any kind, whether express |
| 10 | * or implied. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/ioport.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/timer.h> |
| 19 | #include <linux/completion.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/i2c-pnx.h> |
Kevin Wells | a7d73d8 | 2009-11-12 00:25:52 +0100 | [diff] [blame] | 22 | #include <linux/io.h> |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 23 | #include <linux/err.h> |
| 24 | #include <linux/clk.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 26 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 27 | #include <mach/hardware.h> |
Kevin Wells | a7d73d8 | 2009-11-12 00:25:52 +0100 | [diff] [blame] | 28 | #include <mach/i2c.h> |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 29 | |
| 30 | #define I2C_PNX_TIMEOUT 10 /* msec */ |
| 31 | #define I2C_PNX_SPEED_KHZ 100 |
| 32 | #define I2C_PNX_REGION_SIZE 0x100 |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 33 | |
| 34 | static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data) |
| 35 | { |
| 36 | while (timeout > 0 && |
| 37 | (ioread32(I2C_REG_STS(data)) & mstatus_active)) { |
| 38 | mdelay(1); |
| 39 | timeout--; |
| 40 | } |
| 41 | return (timeout <= 0); |
| 42 | } |
| 43 | |
| 44 | static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data) |
| 45 | { |
| 46 | while (timeout > 0 && |
| 47 | (ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) { |
| 48 | mdelay(1); |
| 49 | timeout--; |
| 50 | } |
| 51 | return (timeout <= 0); |
| 52 | } |
| 53 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 54 | static inline void i2c_pnx_arm_timer(struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 55 | { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 56 | struct timer_list *timer = &alg_data->mif.timer; |
Russell King | eed18b5 | 2009-11-21 12:58:13 +0000 | [diff] [blame] | 57 | unsigned long expires = msecs_to_jiffies(I2C_PNX_TIMEOUT); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 58 | |
Kevin Wells | b2f125b | 2009-11-12 00:28:13 +0100 | [diff] [blame] | 59 | if (expires <= 1) |
| 60 | expires = 2; |
| 61 | |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 62 | del_timer_sync(timer); |
| 63 | |
Russell King | eed18b5 | 2009-11-21 12:58:13 +0000 | [diff] [blame] | 64 | dev_dbg(&alg_data->adapter.dev, "Timer armed at %lu plus %lu jiffies.\n", |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 65 | jiffies, expires); |
| 66 | |
| 67 | timer->expires = jiffies + expires; |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 68 | timer->data = (unsigned long)&alg_data; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 69 | |
| 70 | add_timer(timer); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * i2c_pnx_start - start a device |
| 75 | * @slave_addr: slave address |
| 76 | * @adap: pointer to adapter structure |
| 77 | * |
| 78 | * Generate a START signal in the desired mode. |
| 79 | */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 80 | static int i2c_pnx_start(unsigned char slave_addr, |
| 81 | struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 82 | { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 83 | dev_dbg(&alg_data->adapter.dev, "%s(): addr 0x%x mode %d\n", __func__, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 84 | slave_addr, alg_data->mif.mode); |
| 85 | |
| 86 | /* Check for 7 bit slave addresses only */ |
| 87 | if (slave_addr & ~0x7f) { |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 88 | dev_err(&alg_data->adapter.dev, |
| 89 | "%s: Invalid slave address %x. Only 7-bit addresses are supported\n", |
| 90 | alg_data->adapter.name, slave_addr); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 91 | return -EINVAL; |
| 92 | } |
| 93 | |
| 94 | /* First, make sure bus is idle */ |
| 95 | if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) { |
| 96 | /* Somebody else is monopolizing the bus */ |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 97 | dev_err(&alg_data->adapter.dev, |
| 98 | "%s: Bus busy. Slave addr = %02x, cntrl = %x, stat = %x\n", |
| 99 | alg_data->adapter.name, slave_addr, |
| 100 | ioread32(I2C_REG_CTL(alg_data)), |
| 101 | ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 102 | return -EBUSY; |
| 103 | } else if (ioread32(I2C_REG_STS(alg_data)) & mstatus_afi) { |
| 104 | /* Sorry, we lost the bus */ |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 105 | dev_err(&alg_data->adapter.dev, |
| 106 | "%s: Arbitration failure. Slave addr = %02x\n", |
| 107 | alg_data->adapter.name, slave_addr); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 108 | return -EIO; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * OK, I2C is enabled and we have the bus. |
| 113 | * Clear the current TDI and AFI status flags. |
| 114 | */ |
| 115 | iowrite32(ioread32(I2C_REG_STS(alg_data)) | mstatus_tdi | mstatus_afi, |
| 116 | I2C_REG_STS(alg_data)); |
| 117 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 118 | dev_dbg(&alg_data->adapter.dev, "%s(): sending %#x\n", __func__, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 119 | (slave_addr << 1) | start_bit | alg_data->mif.mode); |
| 120 | |
| 121 | /* Write the slave address, START bit and R/W bit */ |
| 122 | iowrite32((slave_addr << 1) | start_bit | alg_data->mif.mode, |
| 123 | I2C_REG_TX(alg_data)); |
| 124 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 125 | dev_dbg(&alg_data->adapter.dev, "%s(): exit\n", __func__); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * i2c_pnx_stop - stop a device |
| 132 | * @adap: pointer to I2C adapter structure |
| 133 | * |
| 134 | * Generate a STOP signal to terminate the master transaction. |
| 135 | */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 136 | static void i2c_pnx_stop(struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 137 | { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 138 | /* Only 1 msec max timeout due to interrupt context */ |
| 139 | long timeout = 1000; |
| 140 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 141 | dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 142 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 143 | |
| 144 | /* Write a STOP bit to TX FIFO */ |
| 145 | iowrite32(0xff | stop_bit, I2C_REG_TX(alg_data)); |
| 146 | |
| 147 | /* Wait until the STOP is seen. */ |
| 148 | while (timeout > 0 && |
| 149 | (ioread32(I2C_REG_STS(alg_data)) & mstatus_active)) { |
| 150 | /* may be called from interrupt context */ |
| 151 | udelay(1); |
| 152 | timeout--; |
| 153 | } |
| 154 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 155 | dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 156 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /** |
| 160 | * i2c_pnx_master_xmit - transmit data to slave |
| 161 | * @adap: pointer to I2C adapter structure |
| 162 | * |
| 163 | * Sends one byte of data to the slave |
| 164 | */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 165 | static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 166 | { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 167 | u32 val; |
| 168 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 169 | dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 170 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 171 | |
| 172 | if (alg_data->mif.len > 0) { |
| 173 | /* We still have something to talk about... */ |
| 174 | val = *alg_data->mif.buf++; |
| 175 | |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 176 | alg_data->mif.len--; |
| 177 | iowrite32(val, I2C_REG_TX(alg_data)); |
| 178 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 179 | dev_dbg(&alg_data->adapter.dev, "%s(): xmit %#x [%d]\n", |
| 180 | __func__, val, alg_data->mif.len + 1); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 181 | |
| 182 | if (alg_data->mif.len == 0) { |
| 183 | if (alg_data->last) { |
| 184 | /* Wait until the STOP is seen. */ |
| 185 | if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 186 | dev_err(&alg_data->adapter.dev, |
| 187 | "The bus is still active after timeout\n"); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 188 | } |
| 189 | /* Disable master interrupts */ |
| 190 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) & |
| 191 | ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie), |
| 192 | I2C_REG_CTL(alg_data)); |
| 193 | |
| 194 | del_timer_sync(&alg_data->mif.timer); |
| 195 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 196 | dev_dbg(&alg_data->adapter.dev, |
| 197 | "%s(): Waking up xfer routine.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 198 | __func__); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 199 | |
| 200 | complete(&alg_data->mif.complete); |
| 201 | } |
| 202 | } else if (alg_data->mif.len == 0) { |
| 203 | /* zero-sized transfer */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 204 | i2c_pnx_stop(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 205 | |
| 206 | /* Disable master interrupts. */ |
| 207 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) & |
| 208 | ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie), |
| 209 | I2C_REG_CTL(alg_data)); |
| 210 | |
| 211 | /* Stop timer. */ |
| 212 | del_timer_sync(&alg_data->mif.timer); |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 213 | dev_dbg(&alg_data->adapter.dev, |
| 214 | "%s(): Waking up xfer routine after zero-xfer.\n", |
| 215 | __func__); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 216 | |
| 217 | complete(&alg_data->mif.complete); |
| 218 | } |
| 219 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 220 | dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 221 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * i2c_pnx_master_rcv - receive data from slave |
| 228 | * @adap: pointer to I2C adapter structure |
| 229 | * |
| 230 | * Reads one byte data from the slave |
| 231 | */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 232 | static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 233 | { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 234 | unsigned int val = 0; |
| 235 | u32 ctl = 0; |
| 236 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 237 | dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 238 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 239 | |
| 240 | /* Check, whether there is already data, |
| 241 | * or we didn't 'ask' for it yet. |
| 242 | */ |
| 243 | if (ioread32(I2C_REG_STS(alg_data)) & mstatus_rfe) { |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 244 | dev_dbg(&alg_data->adapter.dev, |
| 245 | "%s(): Write dummy data to fill Rx-fifo...\n", |
| 246 | __func__); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 247 | |
| 248 | if (alg_data->mif.len == 1) { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 249 | /* |
| 250 | * Enable interrupt RFDAIE (data in Rx fifo), |
| 251 | * and disable DRMIE (need data for Tx) |
| 252 | */ |
| 253 | ctl = ioread32(I2C_REG_CTL(alg_data)); |
| 254 | ctl |= mcntrl_rffie | mcntrl_daie; |
| 255 | ctl &= ~mcntrl_drmie; |
| 256 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Now we'll 'ask' for data: |
| 261 | * For each byte we want to receive, we must |
| 262 | * write a (dummy) byte to the Tx-FIFO. |
| 263 | */ |
| 264 | iowrite32(val, I2C_REG_TX(alg_data)); |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | /* Handle data. */ |
| 270 | if (alg_data->mif.len > 0) { |
| 271 | val = ioread32(I2C_REG_RX(alg_data)); |
| 272 | *alg_data->mif.buf++ = (u8) (val & 0xff); |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 273 | dev_dbg(&alg_data->adapter.dev, "%s(): rcv 0x%x [%d]\n", |
| 274 | __func__, val, alg_data->mif.len); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 275 | |
| 276 | alg_data->mif.len--; |
| 277 | if (alg_data->mif.len == 0) { |
| 278 | if (alg_data->last) |
| 279 | /* Wait until the STOP is seen. */ |
| 280 | if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 281 | dev_err(&alg_data->adapter.dev, |
| 282 | "The bus is still active after timeout\n"); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 283 | |
| 284 | /* Disable master interrupts */ |
| 285 | ctl = ioread32(I2C_REG_CTL(alg_data)); |
| 286 | ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | |
| 287 | mcntrl_drmie | mcntrl_daie); |
| 288 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 289 | |
| 290 | /* Kill timer. */ |
| 291 | del_timer_sync(&alg_data->mif.timer); |
| 292 | complete(&alg_data->mif.complete); |
| 293 | } |
| 294 | } |
| 295 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 296 | dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 297 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
Vitaly Wool | 6c566fb | 2007-01-04 13:07:03 +0100 | [diff] [blame] | 302 | static irqreturn_t i2c_pnx_interrupt(int irq, void *dev_id) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 303 | { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 304 | struct i2c_pnx_algo_data *alg_data = dev_id; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 305 | u32 stat, ctl; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 306 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 307 | dev_dbg(&alg_data->adapter.dev, |
| 308 | "%s(): mstat = %x mctrl = %x, mode = %d\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 309 | __func__, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 310 | ioread32(I2C_REG_STS(alg_data)), |
| 311 | ioread32(I2C_REG_CTL(alg_data)), |
| 312 | alg_data->mif.mode); |
| 313 | stat = ioread32(I2C_REG_STS(alg_data)); |
| 314 | |
| 315 | /* let's see what kind of event this is */ |
| 316 | if (stat & mstatus_afi) { |
| 317 | /* We lost arbitration in the midst of a transfer */ |
| 318 | alg_data->mif.ret = -EIO; |
| 319 | |
| 320 | /* Disable master interrupts. */ |
| 321 | ctl = ioread32(I2C_REG_CTL(alg_data)); |
| 322 | ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | |
| 323 | mcntrl_drmie); |
| 324 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 325 | |
| 326 | /* Stop timer, to prevent timeout. */ |
| 327 | del_timer_sync(&alg_data->mif.timer); |
| 328 | complete(&alg_data->mif.complete); |
| 329 | } else if (stat & mstatus_nai) { |
| 330 | /* Slave did not acknowledge, generate a STOP */ |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 331 | dev_dbg(&alg_data->adapter.dev, |
| 332 | "%s(): Slave did not acknowledge, generating a STOP.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 333 | __func__); |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 334 | i2c_pnx_stop(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 335 | |
| 336 | /* Disable master interrupts. */ |
| 337 | ctl = ioread32(I2C_REG_CTL(alg_data)); |
| 338 | ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | |
| 339 | mcntrl_drmie); |
| 340 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 341 | |
| 342 | /* Our return value. */ |
| 343 | alg_data->mif.ret = -EIO; |
| 344 | |
| 345 | /* Stop timer, to prevent timeout. */ |
| 346 | del_timer_sync(&alg_data->mif.timer); |
| 347 | complete(&alg_data->mif.complete); |
| 348 | } else { |
| 349 | /* |
| 350 | * Two options: |
| 351 | * - Master Tx needs data. |
| 352 | * - There is data in the Rx-fifo |
| 353 | * The latter is only the case if we have requested for data, |
| 354 | * via a dummy write. (See 'i2c_pnx_master_rcv'.) |
| 355 | * We therefore check, as a sanity check, whether that interrupt |
| 356 | * has been enabled. |
| 357 | */ |
| 358 | if ((stat & mstatus_drmi) || !(stat & mstatus_rfe)) { |
| 359 | if (alg_data->mif.mode == I2C_SMBUS_WRITE) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 360 | i2c_pnx_master_xmit(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 361 | } else if (alg_data->mif.mode == I2C_SMBUS_READ) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 362 | i2c_pnx_master_rcv(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 363 | } |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /* Clear TDI and AFI bits */ |
| 368 | stat = ioread32(I2C_REG_STS(alg_data)); |
| 369 | iowrite32(stat | mstatus_tdi | mstatus_afi, I2C_REG_STS(alg_data)); |
| 370 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 371 | dev_dbg(&alg_data->adapter.dev, |
| 372 | "%s(): exiting, stat = %x ctrl = %x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 373 | __func__, ioread32(I2C_REG_STS(alg_data)), |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 374 | ioread32(I2C_REG_CTL(alg_data))); |
| 375 | |
| 376 | return IRQ_HANDLED; |
| 377 | } |
| 378 | |
| 379 | static void i2c_pnx_timeout(unsigned long data) |
| 380 | { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 381 | struct i2c_pnx_algo_data *alg_data = (struct i2c_pnx_algo_data *)data; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 382 | u32 ctl; |
| 383 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 384 | dev_err(&alg_data->adapter.dev, |
| 385 | "Master timed out. stat = %04x, cntrl = %04x. Resetting master...\n", |
| 386 | ioread32(I2C_REG_STS(alg_data)), |
| 387 | ioread32(I2C_REG_CTL(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 388 | |
| 389 | /* Reset master and disable interrupts */ |
| 390 | ctl = ioread32(I2C_REG_CTL(alg_data)); |
| 391 | ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | mcntrl_drmie); |
| 392 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 393 | |
| 394 | ctl |= mcntrl_reset; |
| 395 | iowrite32(ctl, I2C_REG_CTL(alg_data)); |
| 396 | wait_reset(I2C_PNX_TIMEOUT, alg_data); |
| 397 | alg_data->mif.ret = -EIO; |
| 398 | complete(&alg_data->mif.complete); |
| 399 | } |
| 400 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 401 | static inline void bus_reset_if_active(struct i2c_pnx_algo_data *alg_data) |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 402 | { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 403 | u32 stat; |
| 404 | |
| 405 | if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_active) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 406 | dev_err(&alg_data->adapter.dev, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 407 | "%s: Bus is still active after xfer. Reset it...\n", |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 408 | alg_data->adapter.name); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 409 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, |
| 410 | I2C_REG_CTL(alg_data)); |
| 411 | wait_reset(I2C_PNX_TIMEOUT, alg_data); |
| 412 | } else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) { |
| 413 | /* If there is data in the fifo's after transfer, |
| 414 | * flush fifo's by reset. |
| 415 | */ |
| 416 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, |
| 417 | I2C_REG_CTL(alg_data)); |
| 418 | wait_reset(I2C_PNX_TIMEOUT, alg_data); |
| 419 | } else if (stat & mstatus_nai) { |
| 420 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, |
| 421 | I2C_REG_CTL(alg_data)); |
| 422 | wait_reset(I2C_PNX_TIMEOUT, alg_data); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * i2c_pnx_xfer - generic transfer entry point |
| 428 | * @adap: pointer to I2C adapter structure |
| 429 | * @msgs: array of messages |
| 430 | * @num: number of messages |
| 431 | * |
| 432 | * Initiates the transfer |
| 433 | */ |
| 434 | static int |
| 435 | i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
| 436 | { |
| 437 | struct i2c_msg *pmsg; |
| 438 | int rc = 0, completed = 0, i; |
| 439 | struct i2c_pnx_algo_data *alg_data = adap->algo_data; |
| 440 | u32 stat = ioread32(I2C_REG_STS(alg_data)); |
| 441 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 442 | dev_dbg(&alg_data->adapter.dev, |
| 443 | "%s(): entering: %d messages, stat = %04x.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 444 | __func__, num, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 445 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 446 | bus_reset_if_active(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 447 | |
| 448 | /* Process transactions in a loop. */ |
| 449 | for (i = 0; rc >= 0 && i < num; i++) { |
| 450 | u8 addr; |
| 451 | |
| 452 | pmsg = &msgs[i]; |
| 453 | addr = pmsg->addr; |
| 454 | |
| 455 | if (pmsg->flags & I2C_M_TEN) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 456 | dev_err(&alg_data->adapter.dev, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 457 | "%s: 10 bits addr not supported!\n", |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 458 | alg_data->adapter.name); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 459 | rc = -EINVAL; |
| 460 | break; |
| 461 | } |
| 462 | |
| 463 | alg_data->mif.buf = pmsg->buf; |
| 464 | alg_data->mif.len = pmsg->len; |
| 465 | alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ? |
| 466 | I2C_SMBUS_READ : I2C_SMBUS_WRITE; |
| 467 | alg_data->mif.ret = 0; |
| 468 | alg_data->last = (i == num - 1); |
| 469 | |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 470 | dev_dbg(&alg_data->adapter.dev, "%s(): mode %d, %d bytes\n", |
| 471 | __func__, alg_data->mif.mode, alg_data->mif.len); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 472 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 473 | i2c_pnx_arm_timer(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 474 | |
| 475 | /* initialize the completion var */ |
| 476 | init_completion(&alg_data->mif.complete); |
| 477 | |
| 478 | /* Enable master interrupt */ |
| 479 | iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_afie | |
| 480 | mcntrl_naie | mcntrl_drmie, |
| 481 | I2C_REG_CTL(alg_data)); |
| 482 | |
| 483 | /* Put start-code and slave-address on the bus. */ |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 484 | rc = i2c_pnx_start(addr, alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 485 | if (rc < 0) |
| 486 | break; |
| 487 | |
| 488 | /* Wait for completion */ |
| 489 | wait_for_completion(&alg_data->mif.complete); |
| 490 | |
| 491 | if (!(rc = alg_data->mif.ret)) |
| 492 | completed++; |
Russell King | 4be53db | 2009-11-21 12:46:31 +0000 | [diff] [blame] | 493 | dev_dbg(&alg_data->adapter.dev, |
| 494 | "%s(): Complete, return code = %d.\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 495 | __func__, rc); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 496 | |
| 497 | /* Clear TDI and AFI bits in case they are set. */ |
| 498 | if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_tdi) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 499 | dev_dbg(&alg_data->adapter.dev, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 500 | "%s: TDI still set... clearing now.\n", |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 501 | alg_data->adapter.name); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 502 | iowrite32(stat, I2C_REG_STS(alg_data)); |
| 503 | } |
| 504 | if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_afi) { |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 505 | dev_dbg(&alg_data->adapter.dev, |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 506 | "%s: AFI still set... clearing now.\n", |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 507 | alg_data->adapter.name); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 508 | iowrite32(stat, I2C_REG_STS(alg_data)); |
| 509 | } |
| 510 | } |
| 511 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 512 | bus_reset_if_active(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 513 | |
| 514 | /* Cleanup to be sure... */ |
| 515 | alg_data->mif.buf = NULL; |
| 516 | alg_data->mif.len = 0; |
| 517 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 518 | dev_dbg(&alg_data->adapter.dev, "%s(): exiting, stat = %x\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 519 | __func__, ioread32(I2C_REG_STS(alg_data))); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 520 | |
| 521 | if (completed != num) |
| 522 | return ((rc < 0) ? rc : -EREMOTEIO); |
| 523 | |
| 524 | return num; |
| 525 | } |
| 526 | |
| 527 | static u32 i2c_pnx_func(struct i2c_adapter *adapter) |
| 528 | { |
| 529 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 530 | } |
| 531 | |
| 532 | static struct i2c_algorithm pnx_algorithm = { |
| 533 | .master_xfer = i2c_pnx_xfer, |
| 534 | .functionality = i2c_pnx_func, |
| 535 | }; |
| 536 | |
Russell King | a0dcf19 | 2009-11-20 10:50:34 +0000 | [diff] [blame] | 537 | #ifdef CONFIG_PM |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 538 | static int i2c_pnx_controller_suspend(struct platform_device *pdev, |
| 539 | pm_message_t state) |
| 540 | { |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 541 | struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 542 | |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 543 | /* FIXME: shouldn't this be clk_disable? */ |
| 544 | clk_enable(alg_data->clk); |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 545 | |
| 546 | return 0; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static int i2c_pnx_controller_resume(struct platform_device *pdev) |
| 550 | { |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 551 | struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 552 | |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 553 | return clk_enable(alg_data->clk); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 554 | } |
Russell King | a0dcf19 | 2009-11-20 10:50:34 +0000 | [diff] [blame] | 555 | #else |
| 556 | #define i2c_pnx_controller_suspend NULL |
| 557 | #define i2c_pnx_controller_resume NULL |
| 558 | #endif |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 559 | |
| 560 | static int __devinit i2c_pnx_probe(struct platform_device *pdev) |
| 561 | { |
| 562 | unsigned long tmp; |
| 563 | int ret = 0; |
| 564 | struct i2c_pnx_algo_data *alg_data; |
Russell King | 6fff3da | 2009-11-20 12:46:07 +0000 | [diff] [blame] | 565 | unsigned long freq; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 566 | struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data; |
| 567 | |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 568 | if (!i2c_pnx || !i2c_pnx->name) { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 569 | dev_err(&pdev->dev, "%s: no platform data supplied\n", |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 570 | __func__); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 571 | ret = -EINVAL; |
| 572 | goto out; |
| 573 | } |
| 574 | |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 575 | alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL); |
| 576 | if (!alg_data) { |
| 577 | ret = -ENOMEM; |
| 578 | goto err_kzalloc; |
| 579 | } |
| 580 | |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 581 | platform_set_drvdata(pdev, alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 582 | |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 583 | strlcpy(alg_data->adapter.name, i2c_pnx->name, |
| 584 | sizeof(alg_data->adapter.name)); |
| 585 | alg_data->adapter.dev.parent = &pdev->dev; |
| 586 | alg_data->adapter.algo = &pnx_algorithm; |
| 587 | alg_data->adapter.algo_data = alg_data; |
| 588 | alg_data->adapter.nr = pdev->id; |
| 589 | alg_data->i2c_pnx = i2c_pnx; |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 590 | |
| 591 | alg_data->clk = clk_get(&pdev->dev, NULL); |
| 592 | if (IS_ERR(alg_data->clk)) { |
| 593 | ret = PTR_ERR(alg_data->clk); |
| 594 | goto out_drvdata; |
| 595 | } |
| 596 | |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 597 | init_timer(&alg_data->mif.timer); |
| 598 | alg_data->mif.timer.function = i2c_pnx_timeout; |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 599 | alg_data->mif.timer.data = (unsigned long)alg_data; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 600 | |
| 601 | /* Register I/O resource */ |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 602 | if (!request_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE, |
Julia Lawall | 449d2c7 | 2009-09-18 22:45:51 +0200 | [diff] [blame] | 603 | pdev->name)) { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 604 | dev_err(&pdev->dev, |
| 605 | "I/O region 0x%08x for I2C already in use.\n", |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 606 | i2c_pnx->base); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 607 | ret = -ENODEV; |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 608 | goto out_clkget; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 609 | } |
| 610 | |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 611 | alg_data->ioaddr = ioremap(i2c_pnx->base, I2C_PNX_REGION_SIZE); |
Russell King | 88d968b | 2009-11-21 11:58:36 +0000 | [diff] [blame] | 612 | if (!alg_data->ioaddr) { |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 613 | dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n"); |
| 614 | ret = -ENOMEM; |
| 615 | goto out_release; |
| 616 | } |
| 617 | |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 618 | ret = clk_enable(alg_data->clk); |
| 619 | if (ret) |
| 620 | goto out_unmap; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 621 | |
Russell King | 6fff3da | 2009-11-20 12:46:07 +0000 | [diff] [blame] | 622 | freq = clk_get_rate(alg_data->clk); |
| 623 | |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 624 | /* |
| 625 | * Clock Divisor High This value is the number of system clocks |
| 626 | * the serial clock (SCL) will be high. |
| 627 | * For example, if the system clock period is 50 ns and the maximum |
| 628 | * desired serial period is 10000 ns (100 kHz), then CLKHI would be |
| 629 | * set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value |
| 630 | * programmed into CLKHI will vary from this slightly due to |
| 631 | * variations in the output pad's rise and fall times as well as |
| 632 | * the deglitching filter length. |
| 633 | */ |
| 634 | |
Russell King | 6fff3da | 2009-11-20 12:46:07 +0000 | [diff] [blame] | 635 | tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2; |
Kevin Wells | be80dba | 2010-03-16 15:55:36 -0700 | [diff] [blame^] | 636 | if (tmp > 0x3FF) |
| 637 | tmp = 0x3FF; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 638 | iowrite32(tmp, I2C_REG_CKH(alg_data)); |
| 639 | iowrite32(tmp, I2C_REG_CKL(alg_data)); |
| 640 | |
| 641 | iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data)); |
| 642 | if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) { |
| 643 | ret = -ENODEV; |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 644 | goto out_clock; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 645 | } |
| 646 | init_completion(&alg_data->mif.complete); |
| 647 | |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 648 | ret = request_irq(i2c_pnx->irq, i2c_pnx_interrupt, |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 649 | 0, pdev->name, alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 650 | if (ret) |
| 651 | goto out_clock; |
| 652 | |
| 653 | /* Register this adapter with the I2C subsystem */ |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 654 | ret = i2c_add_numbered_adapter(&alg_data->adapter); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 655 | if (ret < 0) { |
| 656 | dev_err(&pdev->dev, "I2C: Failed to add bus\n"); |
| 657 | goto out_irq; |
| 658 | } |
| 659 | |
| 660 | dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n", |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 661 | alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 662 | |
| 663 | return 0; |
| 664 | |
| 665 | out_irq: |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 666 | free_irq(i2c_pnx->irq, alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 667 | out_clock: |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 668 | clk_disable(alg_data->clk); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 669 | out_unmap: |
Russell King | 88d968b | 2009-11-21 11:58:36 +0000 | [diff] [blame] | 670 | iounmap(alg_data->ioaddr); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 671 | out_release: |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 672 | release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE); |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 673 | out_clkget: |
| 674 | clk_put(alg_data->clk); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 675 | out_drvdata: |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 676 | kfree(alg_data); |
| 677 | err_kzalloc: |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 678 | platform_set_drvdata(pdev, NULL); |
| 679 | out: |
| 680 | return ret; |
| 681 | } |
| 682 | |
| 683 | static int __devexit i2c_pnx_remove(struct platform_device *pdev) |
| 684 | { |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 685 | struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); |
| 686 | struct i2c_pnx_data *i2c_pnx = alg_data->i2c_pnx; |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 687 | |
Russell King | 81d6724 | 2009-11-21 12:40:00 +0000 | [diff] [blame] | 688 | free_irq(i2c_pnx->irq, alg_data); |
Russell King | 9d7f736 | 2009-11-21 12:25:27 +0000 | [diff] [blame] | 689 | i2c_del_adapter(&alg_data->adapter); |
Russell King | ebdbbf2 | 2009-11-20 11:44:46 +0000 | [diff] [blame] | 690 | clk_disable(alg_data->clk); |
Russell King | 88d968b | 2009-11-21 11:58:36 +0000 | [diff] [blame] | 691 | iounmap(alg_data->ioaddr); |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 692 | release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE); |
Russell King | 0321cb8 | 2009-11-20 11:12:26 +0000 | [diff] [blame] | 693 | clk_put(alg_data->clk); |
Russell King | 44c5d73 | 2009-11-21 12:10:54 +0000 | [diff] [blame] | 694 | kfree(alg_data); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 695 | platform_set_drvdata(pdev, NULL); |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | static struct platform_driver i2c_pnx_driver = { |
| 701 | .driver = { |
| 702 | .name = "pnx-i2c", |
| 703 | .owner = THIS_MODULE, |
| 704 | }, |
| 705 | .probe = i2c_pnx_probe, |
| 706 | .remove = __devexit_p(i2c_pnx_remove), |
| 707 | .suspend = i2c_pnx_controller_suspend, |
| 708 | .resume = i2c_pnx_controller_resume, |
| 709 | }; |
| 710 | |
| 711 | static int __init i2c_adap_pnx_init(void) |
| 712 | { |
| 713 | return platform_driver_register(&i2c_pnx_driver); |
| 714 | } |
| 715 | |
| 716 | static void __exit i2c_adap_pnx_exit(void) |
| 717 | { |
| 718 | platform_driver_unregister(&i2c_pnx_driver); |
| 719 | } |
| 720 | |
| 721 | MODULE_AUTHOR("Vitaly Wool, Dennis Kovalev <source@mvista.com>"); |
| 722 | MODULE_DESCRIPTION("I2C driver for Philips IP3204-based I2C busses"); |
| 723 | MODULE_LICENSE("GPL"); |
Kay Sievers | add8eda | 2008-04-22 22:16:49 +0200 | [diff] [blame] | 724 | MODULE_ALIAS("platform:pnx-i2c"); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 725 | |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 726 | /* We need to make sure I2C is initialized before USB */ |
| 727 | subsys_initcall(i2c_adap_pnx_init); |
Vitaly Wool | 41561f2 | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 728 | module_exit(i2c_adap_pnx_exit); |