Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2015, Samsung Electronics |
| 3 | * Przemyslaw Marczak <p.marczak@samsung.com> |
| 4 | * |
| 5 | * This file is based on: drivers/i2c/soft-i2c.c, |
| 6 | * with added driver-model support and code cleanup. |
| 7 | */ |
| 8 | #include <common.h> |
| 9 | #include <errno.h> |
| 10 | #include <dm.h> |
| 11 | #include <i2c.h> |
| 12 | #include <asm/gpio.h> |
| 13 | |
| 14 | #define DEFAULT_UDELAY 5 |
| 15 | #define RETRIES 0 |
| 16 | #define I2C_ACK 0 |
| 17 | #define I2C_NOACK 1 |
| 18 | |
| 19 | DECLARE_GLOBAL_DATA_PTR; |
| 20 | |
| 21 | enum { |
| 22 | PIN_SDA = 0, |
| 23 | PIN_SCL, |
| 24 | PIN_COUNT, |
| 25 | }; |
| 26 | |
| 27 | struct i2c_gpio_bus { |
| 28 | /** |
| 29 | * udelay - delay [us] between GPIO toggle operations, |
| 30 | * which is 1/4 of I2C speed clock period. |
| 31 | */ |
| 32 | int udelay; |
| 33 | /* sda, scl */ |
| 34 | struct gpio_desc gpios[PIN_COUNT]; |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 35 | |
| 36 | int (*get_sda)(struct i2c_gpio_bus *bus); |
| 37 | void (*set_sda)(struct i2c_gpio_bus *bus, int bit); |
| 38 | void (*set_scl)(struct i2c_gpio_bus *bus, int bit); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 39 | }; |
| 40 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 41 | static int i2c_gpio_sda_get(struct i2c_gpio_bus *bus) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 42 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 43 | struct gpio_desc *sda = &bus->gpios[PIN_SDA]; |
| 44 | |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 45 | return dm_gpio_get_value(sda); |
| 46 | } |
| 47 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 48 | static void i2c_gpio_sda_set(struct i2c_gpio_bus *bus, int bit) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 49 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 50 | struct gpio_desc *sda = &bus->gpios[PIN_SDA]; |
| 51 | |
Axel Lin | 76382aa | 2015-04-26 11:05:38 +0800 | [diff] [blame] | 52 | if (bit) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 53 | dm_gpio_set_dir_flags(sda, GPIOD_IS_IN); |
Axel Lin | 76382aa | 2015-04-26 11:05:38 +0800 | [diff] [blame] | 54 | else |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 55 | dm_gpio_set_dir_flags(sda, GPIOD_IS_OUT); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 56 | } |
| 57 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 58 | static void i2c_gpio_scl_set(struct i2c_gpio_bus *bus, int bit) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 59 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 60 | struct gpio_desc *scl = &bus->gpios[PIN_SCL]; |
Axel Lin | 76382aa | 2015-04-26 11:05:38 +0800 | [diff] [blame] | 61 | ulong flags = GPIOD_IS_OUT; |
| 62 | |
| 63 | if (bit) |
| 64 | flags |= GPIOD_IS_OUT_ACTIVE; |
| 65 | dm_gpio_set_dir_flags(scl, flags); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 68 | static void i2c_gpio_write_bit(struct i2c_gpio_bus *bus, int delay, uchar bit) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 69 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 70 | bus->set_scl(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 71 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 72 | bus->set_sda(bus, bit); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 73 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 74 | bus->set_scl(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 75 | udelay(2 * delay); |
| 76 | } |
| 77 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 78 | static int i2c_gpio_read_bit(struct i2c_gpio_bus *bus, int delay) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 79 | { |
| 80 | int value; |
| 81 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 82 | bus->set_scl(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 83 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 84 | value = bus->get_sda(bus); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 85 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 86 | bus->set_scl(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 87 | udelay(2 * delay); |
| 88 | |
| 89 | return value; |
| 90 | } |
| 91 | |
| 92 | /* START: High -> Low on SDA while SCL is High */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 93 | static void i2c_gpio_send_start(struct i2c_gpio_bus *bus, int delay) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 94 | { |
| 95 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 96 | bus->set_sda(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 97 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 98 | bus->set_scl(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 99 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 100 | bus->set_sda(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 101 | udelay(delay); |
| 102 | } |
| 103 | |
| 104 | /* STOP: Low -> High on SDA while SCL is High */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 105 | static void i2c_gpio_send_stop(struct i2c_gpio_bus *bus, int delay) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 106 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 107 | bus->set_scl(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 108 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 109 | bus->set_sda(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 110 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 111 | bus->set_scl(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 112 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 113 | bus->set_sda(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 114 | udelay(delay); |
| 115 | } |
| 116 | |
| 117 | /* ack should be I2C_ACK or I2C_NOACK */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 118 | static void i2c_gpio_send_ack(struct i2c_gpio_bus *bus, int delay, int ack) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 119 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 120 | i2c_gpio_write_bit(bus, delay, ack); |
| 121 | bus->set_scl(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 122 | udelay(delay); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Send a reset sequence consisting of 9 clocks with the data signal high |
| 127 | * to clock any confused device back into an idle state. Also send a |
| 128 | * <stop> at the end of the sequence for belts & suspenders. |
| 129 | */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 130 | static void i2c_gpio_send_reset(struct i2c_gpio_bus *bus, int delay) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 131 | { |
| 132 | int j; |
| 133 | |
| 134 | for (j = 0; j < 9; j++) |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 135 | i2c_gpio_write_bit(bus, delay, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 136 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 137 | i2c_gpio_send_stop(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | /* Set sda high with low clock, before reading slave data */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 141 | static void i2c_gpio_sda_high(struct i2c_gpio_bus *bus, int delay) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 142 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 143 | bus->set_scl(bus, 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 144 | udelay(delay); |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 145 | bus->set_sda(bus, 1); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 146 | udelay(delay); |
| 147 | } |
| 148 | |
| 149 | /* Send 8 bits and look for an acknowledgement */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 150 | static int i2c_gpio_write_byte(struct i2c_gpio_bus *bus, int delay, uchar data) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 151 | { |
| 152 | int j; |
| 153 | int nack; |
| 154 | |
| 155 | for (j = 0; j < 8; j++) { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 156 | i2c_gpio_write_bit(bus, delay, data & 0x80); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 157 | data <<= 1; |
| 158 | } |
| 159 | |
| 160 | udelay(delay); |
| 161 | |
| 162 | /* Look for an <ACK>(negative logic) and return it */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 163 | i2c_gpio_sda_high(bus, delay); |
| 164 | nack = i2c_gpio_read_bit(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 165 | |
| 166 | return nack; /* not a nack is an ack */ |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * if ack == I2C_ACK, ACK the byte so can continue reading, else |
| 171 | * send I2C_NOACK to end the read. |
| 172 | */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 173 | static uchar i2c_gpio_read_byte(struct i2c_gpio_bus *bus, int delay, int ack) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 174 | { |
| 175 | int data; |
| 176 | int j; |
| 177 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 178 | i2c_gpio_sda_high(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 179 | data = 0; |
| 180 | for (j = 0; j < 8; j++) { |
| 181 | data <<= 1; |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 182 | data |= i2c_gpio_read_bit(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 183 | } |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 184 | i2c_gpio_send_ack(bus, delay, ack); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 185 | |
| 186 | return data; |
| 187 | } |
| 188 | |
| 189 | /* send start and the slave chip address */ |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 190 | int i2c_send_slave_addr(struct i2c_gpio_bus *bus, int delay, uchar chip) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 191 | { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 192 | i2c_gpio_send_start(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 193 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 194 | if (i2c_gpio_write_byte(bus, delay, chip)) { |
| 195 | i2c_gpio_send_stop(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 196 | return -EIO; |
| 197 | } |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int i2c_gpio_write_data(struct i2c_gpio_bus *bus, uchar chip, |
| 203 | uchar *buffer, int len, |
| 204 | bool end_with_repeated_start) |
| 205 | { |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 206 | unsigned int delay = bus->udelay; |
| 207 | int failures = 0; |
| 208 | |
| 209 | debug("%s: chip %x buffer %p len %d\n", __func__, chip, buffer, len); |
| 210 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 211 | if (i2c_send_slave_addr(bus, delay, chip << 1)) { |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 212 | debug("i2c_write, no chip responded %02X\n", chip); |
| 213 | return -EIO; |
| 214 | } |
| 215 | |
| 216 | while (len-- > 0) { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 217 | if (i2c_gpio_write_byte(bus, delay, *buffer++)) |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 218 | failures++; |
| 219 | } |
| 220 | |
| 221 | if (!end_with_repeated_start) { |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 222 | i2c_gpio_send_stop(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 223 | return failures; |
| 224 | } |
| 225 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 226 | if (i2c_send_slave_addr(bus, delay, (chip << 1) | 0x1)) { |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 227 | debug("i2c_write, no chip responded %02X\n", chip); |
| 228 | return -EIO; |
| 229 | } |
| 230 | |
| 231 | return failures; |
| 232 | } |
| 233 | |
| 234 | static int i2c_gpio_read_data(struct i2c_gpio_bus *bus, uchar chip, |
| 235 | uchar *buffer, int len) |
| 236 | { |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 237 | unsigned int delay = bus->udelay; |
| 238 | |
| 239 | debug("%s: chip %x buffer: %p len %d\n", __func__, chip, buffer, len); |
| 240 | |
| 241 | while (len-- > 0) |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 242 | *buffer++ = i2c_gpio_read_byte(bus, delay, len == 0); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 243 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 244 | i2c_gpio_send_stop(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static int i2c_gpio_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs) |
| 250 | { |
| 251 | struct i2c_gpio_bus *bus = dev_get_priv(dev); |
| 252 | int ret; |
| 253 | |
| 254 | for (; nmsgs > 0; nmsgs--, msg++) { |
| 255 | bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD); |
| 256 | |
| 257 | if (msg->flags & I2C_M_RD) { |
| 258 | ret = i2c_gpio_read_data(bus, msg->addr, msg->buf, |
| 259 | msg->len); |
| 260 | } else { |
| 261 | ret = i2c_gpio_write_data(bus, msg->addr, msg->buf, |
| 262 | msg->len, next_is_read); |
| 263 | } |
| 264 | |
| 265 | if (ret) |
| 266 | return -EREMOTEIO; |
| 267 | } |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int i2c_gpio_probe(struct udevice *dev, uint chip, uint chip_flags) |
| 273 | { |
| 274 | struct i2c_gpio_bus *bus = dev_get_priv(dev); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 275 | unsigned int delay = bus->udelay; |
| 276 | int ret; |
| 277 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 278 | i2c_gpio_send_start(bus, delay); |
| 279 | ret = i2c_gpio_write_byte(bus, delay, (chip << 1) | 0); |
| 280 | i2c_gpio_send_stop(bus, delay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 281 | |
| 282 | debug("%s: bus: %d (%s) chip: %x flags: %x ret: %d\n", |
| 283 | __func__, dev->seq, dev->name, chip, chip_flags, ret); |
| 284 | |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | static int i2c_gpio_set_bus_speed(struct udevice *dev, unsigned int speed_hz) |
| 289 | { |
| 290 | struct i2c_gpio_bus *bus = dev_get_priv(dev); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 291 | |
| 292 | bus->udelay = 1000000 / (speed_hz << 2); |
| 293 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 294 | i2c_gpio_send_reset(bus, bus->udelay); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
Marek Vasut | 4368c6a | 2020-02-07 16:57:52 +0100 | [diff] [blame] | 299 | static int i2c_gpio_drv_probe(struct udevice *dev) |
| 300 | { |
| 301 | if (dev_read_bool(dev, "i2c-gpio,deblock")) { |
| 302 | /* @200kHz 9 clocks = 44us, 62us is ok */ |
| 303 | const unsigned int DELAY_ABORT_SEQ = 62; |
| 304 | struct i2c_gpio_bus *bus = dev_get_priv(dev); |
| 305 | |
| 306 | return i2c_deblock_gpio_loop(&bus->gpios[PIN_SDA], |
| 307 | &bus->gpios[PIN_SCL], |
| 308 | 16, 5, DELAY_ABORT_SEQ); |
| 309 | } |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 314 | static int i2c_gpio_ofdata_to_platdata(struct udevice *dev) |
| 315 | { |
| 316 | struct i2c_gpio_bus *bus = dev_get_priv(dev); |
| 317 | const void *blob = gd->fdt_blob; |
Simon Glass | e160f7d | 2017-01-17 16:52:55 -0700 | [diff] [blame] | 318 | int node = dev_of_offset(dev); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 319 | int ret; |
| 320 | |
| 321 | ret = gpio_request_list_by_name(dev, "gpios", bus->gpios, |
| 322 | ARRAY_SIZE(bus->gpios), 0); |
| 323 | if (ret < 0) |
| 324 | goto error; |
| 325 | |
| 326 | bus->udelay = fdtdec_get_int(blob, node, "i2c-gpio,delay-us", |
| 327 | DEFAULT_UDELAY); |
| 328 | |
Michael Auchter | 7383edc | 2020-02-07 10:55:31 -0600 | [diff] [blame^] | 329 | bus->get_sda = i2c_gpio_sda_get; |
| 330 | bus->set_sda = i2c_gpio_sda_set; |
| 331 | bus->set_scl = i2c_gpio_scl_set; |
| 332 | |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 333 | return 0; |
| 334 | error: |
Masahiro Yamada | 9b643e3 | 2017-09-16 14:10:41 +0900 | [diff] [blame] | 335 | pr_err("Can't get %s gpios! Error: %d", dev->name, ret); |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | static const struct dm_i2c_ops i2c_gpio_ops = { |
| 340 | .xfer = i2c_gpio_xfer, |
| 341 | .probe_chip = i2c_gpio_probe, |
| 342 | .set_bus_speed = i2c_gpio_set_bus_speed, |
| 343 | }; |
| 344 | |
| 345 | static const struct udevice_id i2c_gpio_ids[] = { |
| 346 | { .compatible = "i2c-gpio" }, |
| 347 | { } |
| 348 | }; |
| 349 | |
| 350 | U_BOOT_DRIVER(i2c_gpio) = { |
| 351 | .name = "i2c-gpio", |
| 352 | .id = UCLASS_I2C, |
| 353 | .of_match = i2c_gpio_ids, |
Marek Vasut | 4368c6a | 2020-02-07 16:57:52 +0100 | [diff] [blame] | 354 | .probe = i2c_gpio_drv_probe, |
Przemyslaw Marczak | c54473c | 2015-03-31 18:57:18 +0200 | [diff] [blame] | 355 | .ofdata_to_platdata = i2c_gpio_ofdata_to_platdata, |
| 356 | .priv_auto_alloc_size = sizeof(struct i2c_gpio_bus), |
| 357 | .ops = &i2c_gpio_ops, |
| 358 | }; |