1 // SPDX-License-Identifier: GPL-2.0+
3 * i2c driver for Freescale i.MX series
5 * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
6 * (c) 2011 Marek Vasut <marek.vasut@gmail.com>
8 * Based on i2c-imx.c from linux kernel:
9 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de>
10 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de>
11 * Copyright (C) 2007 RightHand Technologies, Inc.
12 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
17 #include <asm/arch/clock.h>
18 #include <asm/arch/imx-regs.h>
19 #include <linux/errno.h>
20 #include <asm/mach-imx/mxc_i2c.h>
25 #include <dm/pinctrl.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 #define I2C_QUIRK_FLAG (1 << 0)
32 #define IMX_I2C_REGSHIFT 2
33 #define VF610_I2C_REGSHIFT 0
35 #define I2C_EARLY_INIT_INDEX 0
36 #ifdef CONFIG_SYS_I2C_IFDR_DIV
37 #define I2C_IFDR_DIV_CONSERVATIVE CONFIG_SYS_I2C_IFDR_DIV
39 #define I2C_IFDR_DIV_CONSERVATIVE 0x7e
49 #define I2CR_IIEN (1 << 6)
50 #define I2CR_MSTA (1 << 5)
51 #define I2CR_MTX (1 << 4)
52 #define I2CR_TX_NO_AK (1 << 3)
53 #define I2CR_RSTA (1 << 2)
55 #define I2SR_ICF (1 << 7)
56 #define I2SR_IBB (1 << 5)
57 #define I2SR_IAL (1 << 4)
58 #define I2SR_IIF (1 << 1)
59 #define I2SR_RX_NO_AK (1 << 0)
62 #define I2CR_IEN (0 << 7)
63 #define I2CR_IDIS (1 << 7)
64 #define I2SR_IIF_CLEAR (1 << 1)
66 #define I2CR_IEN (1 << 7)
67 #define I2CR_IDIS (0 << 7)
68 #define I2SR_IIF_CLEAR (0 << 1)
72 static u16 i2c_clk_div[60][2] = {
73 { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 },
74 { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 },
75 { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D },
76 { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 },
77 { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 },
78 { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 },
79 { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 },
80 { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 },
81 { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 },
82 { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B },
83 { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 },
84 { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 },
85 { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B },
86 { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A },
87 { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E },
90 static u16 i2c_clk_div[50][2] = {
91 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
92 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
93 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
94 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
95 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
96 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
97 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
98 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
99 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
100 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
101 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
102 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
103 { 3072, 0x1E }, { 3840, 0x1F }
107 #ifndef CONFIG_SYS_MXC_I2C1_SPEED
108 #define CONFIG_SYS_MXC_I2C1_SPEED 100000
110 #ifndef CONFIG_SYS_MXC_I2C2_SPEED
111 #define CONFIG_SYS_MXC_I2C2_SPEED 100000
113 #ifndef CONFIG_SYS_MXC_I2C3_SPEED
114 #define CONFIG_SYS_MXC_I2C3_SPEED 100000
116 #ifndef CONFIG_SYS_MXC_I2C4_SPEED
117 #define CONFIG_SYS_MXC_I2C4_SPEED 100000
120 #ifndef CONFIG_SYS_MXC_I2C1_SLAVE
121 #define CONFIG_SYS_MXC_I2C1_SLAVE 0
123 #ifndef CONFIG_SYS_MXC_I2C2_SLAVE
124 #define CONFIG_SYS_MXC_I2C2_SLAVE 0
126 #ifndef CONFIG_SYS_MXC_I2C3_SLAVE
127 #define CONFIG_SYS_MXC_I2C3_SLAVE 0
129 #ifndef CONFIG_SYS_MXC_I2C4_SLAVE
130 #define CONFIG_SYS_MXC_I2C4_SLAVE 0
134 * Calculate and set proper clock divider
136 static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate)
138 unsigned int i2c_clk_rate;
142 #if defined(CONFIG_MX31)
143 struct clock_control_regs *sc_regs =
144 (struct clock_control_regs *)CCM_BASE;
146 /* start the required I2C clock */
147 writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET),
151 /* Divider value calculation */
152 i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK);
153 div = (i2c_clk_rate + rate - 1) / rate;
154 if (div < i2c_clk_div[0][0])
156 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
157 clk_div = ARRAY_SIZE(i2c_clk_div) - 1;
159 for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++)
162 /* Store divider value */
169 static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed)
171 ulong base = i2c_bus->base;
172 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
173 u8 clk_idx = i2c_imx_get_clk(i2c_bus, speed);
174 u8 idx = i2c_clk_div[clk_idx][1];
175 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
180 /* Store divider value */
181 writeb(idx, base + (IFDR << reg_shift));
184 writeb(I2CR_IDIS, base + (I2CR << reg_shift));
185 writeb(0, base + (I2SR << reg_shift));
189 #define ST_BUS_IDLE (0 | (I2SR_IBB << 8))
190 #define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8))
191 #define ST_IIF (I2SR_IIF | (I2SR_IIF << 8))
193 static int wait_for_sr_state(struct mxc_i2c_bus *i2c_bus, unsigned state)
197 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
198 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
199 ulong base = i2c_bus->base;
200 ulong start_time = get_timer(0);
202 sr = readb(base + (I2SR << reg_shift));
205 writeb(sr | I2SR_IAL, base +
206 (I2SR << reg_shift));
208 writeb(sr & ~I2SR_IAL, base +
209 (I2SR << reg_shift));
210 printf("%s: Arbitration lost sr=%x cr=%x state=%x\n",
211 __func__, sr, readb(base + (I2CR << reg_shift)),
215 if ((sr & (state >> 8)) == (unsigned char)state)
218 elapsed = get_timer(start_time);
219 if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */
222 printf("%s: failed sr=%x cr=%x state=%x\n", __func__,
223 sr, readb(base + (I2CR << reg_shift)), state);
227 static int tx_byte(struct mxc_i2c_bus *i2c_bus, u8 byte)
230 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
231 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
232 ulong base = i2c_bus->base;
234 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
235 writeb(byte, base + (I2DR << reg_shift));
237 ret = wait_for_sr_state(i2c_bus, ST_IIF);
240 if (ret & I2SR_RX_NO_AK)
246 * Stub implementations for outer i2c slave operations.
248 void __i2c_force_reset_slave(void)
251 void i2c_force_reset_slave(void)
252 __attribute__((weak, alias("__i2c_force_reset_slave")));
255 * Stop I2C transaction
257 static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus)
260 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
261 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
262 ulong base = i2c_bus->base;
263 unsigned int temp = readb(base + (I2CR << reg_shift));
265 temp &= ~(I2CR_MSTA | I2CR_MTX);
266 writeb(temp, base + (I2CR << reg_shift));
267 ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
269 printf("%s:trigger stop failed\n", __func__);
273 * Send start signal, chip address and
274 * write register address
276 static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip,
281 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
282 ulong base = i2c_bus->base;
283 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
285 /* Reset i2c slave */
286 i2c_force_reset_slave();
288 /* Enable I2C controller */
290 ret = readb(base + (I2CR << reg_shift)) & I2CR_IDIS;
292 ret = !(readb(base + (I2CR << reg_shift)) & I2CR_IEN);
295 writeb(I2CR_IEN, base + (I2CR << reg_shift));
296 /* Wait for controller to be stable */
300 if (readb(base + (IADR << reg_shift)) == (chip << 1))
301 writeb((chip << 1) ^ 2, base + (IADR << reg_shift));
302 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
303 ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
307 /* Start I2C transaction */
308 temp = readb(base + (I2CR << reg_shift));
310 writeb(temp, base + (I2CR << reg_shift));
312 ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY);
316 temp |= I2CR_MTX | I2CR_TX_NO_AK;
317 writeb(temp, base + (I2CR << reg_shift));
320 /* write slave address */
321 ret = tx_byte(i2c_bus, chip << 1);
326 ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
335 #ifndef CONFIG_DM_I2C
336 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
338 if (i2c_bus && i2c_bus->idle_bus_fn)
339 return i2c_bus->idle_bus_fn(i2c_bus->idle_bus_data);
344 * See Linux Documentation/devicetree/bindings/i2c/i2c-imx.txt
346 * scl-gpios: specify the gpio related to SCL pin
347 * sda-gpios: specify the gpio related to SDA pin
348 * add pinctrl to configure i2c pins to gpio function for i2c
349 * bus recovery, call it "gpio" state
352 * The i2c_idle_bus is an implementation following Linux Kernel.
354 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
356 struct udevice *bus = i2c_bus->bus;
357 struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
358 struct gpio_desc *scl_gpio = &i2c_bus->scl_gpio;
359 struct gpio_desc *sda_gpio = &i2c_bus->sda_gpio;
360 int sda, scl, idle_sclks;
362 ulong elapsed, start_time;
364 if (pinctrl_select_state(bus, "gpio")) {
365 dev_dbg(bus, "Can not to switch to use gpio pinmux\n");
367 * GPIO pinctrl for i2c force idle is not a must,
368 * but it is strongly recommended to be used.
369 * Because it can help you to recover from bad
370 * i2c bus state. Do not return failure, because
376 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
377 dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
378 scl = dm_gpio_get_value(scl_gpio);
379 sda = dm_gpio_get_value(sda_gpio);
381 if ((sda & scl) == 1)
382 goto exit; /* Bus is idle already */
385 * In most cases it is just enough to generate 8 + 1 SCLK
386 * clocks to recover I2C slave device from 'stuck' state
387 * (when for example SW reset was performed, in the middle of
390 * However, there are devices which send data in packets of
391 * N bytes (N > 1). In such case we do need N * 8 + 1 SCLK
396 if (i2c->max_transaction_bytes > 0)
397 idle_sclks = i2c->max_transaction_bytes * 8 + 1;
398 /* Send high and low on the SCL line */
399 for (i = 0; i < idle_sclks; i++) {
400 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_OUT);
401 dm_gpio_set_value(scl_gpio, 0);
403 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
406 start_time = get_timer(0);
408 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
409 dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
410 scl = dm_gpio_get_value(scl_gpio);
411 sda = dm_gpio_get_value(sda_gpio);
412 if ((sda & scl) == 1)
415 elapsed = get_timer(start_time);
416 if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */
418 printf("%s: failed to clear bus, sda=%d scl=%d\n", __func__, sda, scl);
424 pinctrl_select_state(bus, "default");
429 static int i2c_init_transfer(struct mxc_i2c_bus *i2c_bus, u8 chip,
434 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
435 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
440 for (retry = 0; retry < 3; retry++) {
441 ret = i2c_init_transfer_(i2c_bus, chip, addr, alen);
444 i2c_imx_stop(i2c_bus);
445 if (ret == -EREMOTEIO)
448 printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip,
450 if (ret != -ERESTART)
451 /* Disable controller */
452 writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift));
454 if (i2c_idle_bus(i2c_bus) < 0)
457 printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base);
462 static int i2c_write_data(struct mxc_i2c_bus *i2c_bus, u8 chip, const u8 *buf,
467 debug("i2c_write_data: chip=0x%x, len=0x%x\n", chip, len);
468 debug("write_data: ");
469 /* use rc for counter */
470 for (i = 0; i < len; ++i)
471 debug(" 0x%02x", buf[i]);
474 for (i = 0; i < len; i++) {
475 ret = tx_byte(i2c_bus, buf[i]);
477 debug("i2c_write_data(): rc=%d\n", ret);
485 static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf,
491 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
492 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
493 ulong base = i2c_bus->base;
495 debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len);
497 /* setup bus to read data */
498 temp = readb(base + (I2CR << reg_shift));
499 temp &= ~(I2CR_MTX | I2CR_TX_NO_AK);
501 temp |= I2CR_TX_NO_AK;
502 writeb(temp, base + (I2CR << reg_shift));
503 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
504 /* dummy read to clear ICF */
505 readb(base + (I2DR << reg_shift));
508 for (i = 0; i < len; i++) {
509 ret = wait_for_sr_state(i2c_bus, ST_IIF);
511 debug("i2c_read_data(): ret=%d\n", ret);
512 i2c_imx_stop(i2c_bus);
517 * It must generate STOP before read I2DR to prevent
518 * controller from generating another clock cycle
520 if (i == (len - 1)) {
521 i2c_imx_stop(i2c_bus);
522 } else if (i == (len - 2)) {
523 temp = readb(base + (I2CR << reg_shift));
524 temp |= I2CR_TX_NO_AK;
525 writeb(temp, base + (I2CR << reg_shift));
527 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
528 buf[i] = readb(base + (I2DR << reg_shift));
531 /* reuse ret for counter*/
532 for (ret = 0; ret < len; ++ret)
533 debug(" 0x%02x", buf[ret]);
536 i2c_imx_stop(i2c_bus);
540 #ifndef CONFIG_DM_I2C
542 * Read data from I2C device
544 * The transactions use the syntax defined in the Linux kernel I2C docs.
546 * If alen is > 0, then this function will send a transaction of the form:
547 * S Chip Wr [A] Addr [A] S Chip Rd [A] [data] A ... NA P
548 * This is a normal I2C register read: writing the register address, then doing
549 * a repeated start and reading the data.
551 * If alen == 0, then we get this transaction:
552 * S Chip Wr [A] S Chip Rd [A] [data] A ... NA P
553 * This is somewhat unusual, though valid, transaction. It addresses the chip
554 * in write mode, but doesn't actually write any register address or data, then
555 * does a repeated start and reads data.
557 * If alen < 0, then we get this transaction:
558 * S Chip Rd [A] [data] A ... NA P
559 * The chip is addressed in read mode and then data is read. No register
560 * address is written first. This is perfectly valid on most devices and
561 * required on some (usually those that don't act like an array of registers).
563 static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
564 int alen, u8 *buf, int len)
568 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
569 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
570 ulong base = i2c_bus->base;
572 ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
577 temp = readb(base + (I2CR << reg_shift));
579 writeb(temp, base + (I2CR << reg_shift));
582 ret = tx_byte(i2c_bus, (chip << 1) | 1);
584 i2c_imx_stop(i2c_bus);
588 ret = i2c_read_data(i2c_bus, chip, buf, len);
590 i2c_imx_stop(i2c_bus);
595 * Write data to I2C device
597 * If alen > 0, we get this transaction:
598 * S Chip Wr [A] addr [A] data [A] ... [A] P
599 * An ordinary write register command.
601 * If alen == 0, then we get this:
602 * S Chip Wr [A] data [A] ... [A] P
603 * This is a simple I2C write.
605 * If alen < 0, then we get this:
606 * S data [A] ... [A] P
607 * This is most likely NOT something that should be used. It doesn't send the
608 * chip address first, so in effect, the first byte of data will be used as the
611 static int bus_i2c_write(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
612 int alen, const u8 *buf, int len)
616 ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
620 ret = i2c_write_data(i2c_bus, chip, buf, len);
622 i2c_imx_stop(i2c_bus);
627 #if !defined(I2C2_BASE_ADDR)
628 #define I2C2_BASE_ADDR 0
631 #if !defined(I2C3_BASE_ADDR)
632 #define I2C3_BASE_ADDR 0
635 #if !defined(I2C4_BASE_ADDR)
636 #define I2C4_BASE_ADDR 0
639 #if !defined(I2C5_BASE_ADDR)
640 #define I2C5_BASE_ADDR 0
643 #if !defined(I2C6_BASE_ADDR)
644 #define I2C6_BASE_ADDR 0
647 #if !defined(I2C7_BASE_ADDR)
648 #define I2C7_BASE_ADDR 0
651 #if !defined(I2C8_BASE_ADDR)
652 #define I2C8_BASE_ADDR 0
655 static struct mxc_i2c_bus mxc_i2c_buses[] = {
656 #if defined(CONFIG_ARCH_LS1021A) || defined(CONFIG_VF610) || \
657 defined(CONFIG_FSL_LAYERSCAPE)
658 { 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG },
659 { 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG },
660 { 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG },
661 { 3, I2C4_BASE_ADDR, I2C_QUIRK_FLAG },
662 { 4, I2C5_BASE_ADDR, I2C_QUIRK_FLAG },
663 { 5, I2C6_BASE_ADDR, I2C_QUIRK_FLAG },
664 { 6, I2C7_BASE_ADDR, I2C_QUIRK_FLAG },
665 { 7, I2C8_BASE_ADDR, I2C_QUIRK_FLAG },
667 { 0, I2C1_BASE_ADDR, 0 },
668 { 1, I2C2_BASE_ADDR, 0 },
669 { 2, I2C3_BASE_ADDR, 0 },
670 { 3, I2C4_BASE_ADDR, 0 },
671 { 4, I2C5_BASE_ADDR, 0 },
672 { 5, I2C6_BASE_ADDR, 0 },
673 { 6, I2C7_BASE_ADDR, 0 },
674 { 7, I2C8_BASE_ADDR, 0 },
678 struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap)
680 return &mxc_i2c_buses[adap->hwadapnr];
683 static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip,
684 uint addr, int alen, uint8_t *buffer,
687 return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len);
690 static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip,
691 uint addr, int alen, uint8_t *buffer,
694 return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len);
698 * Test if a chip at a given address responds (probe the chip)
700 static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip)
702 return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0);
705 int __enable_i2c_clk(unsigned char enable, unsigned i2c_num)
709 int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
710 __attribute__((weak, alias("__enable_i2c_clk")));
712 void bus_i2c_init(int index, int speed, int unused,
713 int (*idle_bus_fn)(void *p), void *idle_bus_data)
717 if (index >= ARRAY_SIZE(mxc_i2c_buses)) {
718 debug("Error i2c index\n");
723 * Warning: Be careful to allow the assignment to a static
724 * variable here. This function could be called while U-Boot is
725 * still running in flash memory. So such assignment is equal
726 * to write data to flash without erasing.
729 mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn;
731 mxc_i2c_buses[index].idle_bus_data = idle_bus_data;
733 ret = enable_i2c_clk(1, index);
735 debug("I2C-%d clk fail to enable.\n", index);
739 bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed);
743 * Early init I2C for prepare read the clk through I2C.
745 void i2c_early_init_f(void)
747 ulong base = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].base;
748 bool quirk = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].driver_data
749 & I2C_QUIRK_FLAG ? true : false;
750 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
752 /* Set I2C divider value */
753 writeb(I2C_IFDR_DIV_CONSERVATIVE, base + (IFDR << reg_shift));
755 writeb(I2CR_IDIS, base + (I2CR << reg_shift));
756 writeb(0, base + (I2SR << reg_shift));
758 writeb(I2CR_IEN, base + (I2CR << reg_shift));
764 static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
766 bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL);
772 static u32 mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed)
774 return bus_i2c_set_bus_speed(i2c_get_base(adap), speed);
778 * Register mxc i2c adapters
780 #ifdef CONFIG_SYS_I2C_MXC_I2C1
781 U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe,
782 mxc_i2c_read, mxc_i2c_write,
783 mxc_i2c_set_bus_speed,
784 CONFIG_SYS_MXC_I2C1_SPEED,
785 CONFIG_SYS_MXC_I2C1_SLAVE, 0)
788 #ifdef CONFIG_SYS_I2C_MXC_I2C2
789 U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe,
790 mxc_i2c_read, mxc_i2c_write,
791 mxc_i2c_set_bus_speed,
792 CONFIG_SYS_MXC_I2C2_SPEED,
793 CONFIG_SYS_MXC_I2C2_SLAVE, 1)
796 #ifdef CONFIG_SYS_I2C_MXC_I2C3
797 U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
798 mxc_i2c_read, mxc_i2c_write,
799 mxc_i2c_set_bus_speed,
800 CONFIG_SYS_MXC_I2C3_SPEED,
801 CONFIG_SYS_MXC_I2C3_SLAVE, 2)
804 #ifdef CONFIG_SYS_I2C_MXC_I2C4
805 U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe,
806 mxc_i2c_read, mxc_i2c_write,
807 mxc_i2c_set_bus_speed,
808 CONFIG_SYS_MXC_I2C4_SPEED,
809 CONFIG_SYS_MXC_I2C4_SLAVE, 3)
812 #ifdef CONFIG_SYS_I2C_MXC_I2C5
813 U_BOOT_I2C_ADAP_COMPLETE(mxc4, mxc_i2c_init, mxc_i2c_probe,
814 mxc_i2c_read, mxc_i2c_write,
815 mxc_i2c_set_bus_speed,
816 CONFIG_SYS_MXC_I2C5_SPEED,
817 CONFIG_SYS_MXC_I2C5_SLAVE, 4)
820 #ifdef CONFIG_SYS_I2C_MXC_I2C6
821 U_BOOT_I2C_ADAP_COMPLETE(mxc5, mxc_i2c_init, mxc_i2c_probe,
822 mxc_i2c_read, mxc_i2c_write,
823 mxc_i2c_set_bus_speed,
824 CONFIG_SYS_MXC_I2C6_SPEED,
825 CONFIG_SYS_MXC_I2C6_SLAVE, 5)
828 #ifdef CONFIG_SYS_I2C_MXC_I2C7
829 U_BOOT_I2C_ADAP_COMPLETE(mxc6, mxc_i2c_init, mxc_i2c_probe,
830 mxc_i2c_read, mxc_i2c_write,
831 mxc_i2c_set_bus_speed,
832 CONFIG_SYS_MXC_I2C7_SPEED,
833 CONFIG_SYS_MXC_I2C7_SLAVE, 6)
836 #ifdef CONFIG_SYS_I2C_MXC_I2C8
837 U_BOOT_I2C_ADAP_COMPLETE(mxc7, mxc_i2c_init, mxc_i2c_probe,
838 mxc_i2c_read, mxc_i2c_write,
839 mxc_i2c_set_bus_speed,
840 CONFIG_SYS_MXC_I2C8_SPEED,
841 CONFIG_SYS_MXC_I2C8_SLAVE, 7)
846 static int mxc_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
848 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
850 return bus_i2c_set_bus_speed(i2c_bus, speed);
853 static int mxc_i2c_probe(struct udevice *bus)
855 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
856 const void *fdt = gd->fdt_blob;
857 int node = dev_of_offset(bus);
861 i2c_bus->driver_data = dev_get_driver_data(bus);
863 addr = devfdt_get_addr(bus);
864 if (addr == FDT_ADDR_T_NONE)
867 i2c_bus->base = addr;
868 i2c_bus->index = bus->seq;
872 ret = enable_i2c_clk(1, bus->seq);
877 * See Documentation/devicetree/bindings/i2c/i2c-imx.txt
878 * Use gpio to force bus idle when necessary.
880 ret = fdt_stringlist_search(fdt, node, "pinctrl-names", "gpio");
882 debug("i2c bus %d at 0x%2lx, no gpio pinctrl state.\n", bus->seq, i2c_bus->base);
884 ret = gpio_request_by_name_nodev(offset_to_ofnode(node),
885 "scl-gpios", 0, &i2c_bus->scl_gpio,
887 ret2 = gpio_request_by_name_nodev(offset_to_ofnode(node),
888 "sda-gpios", 0, &i2c_bus->sda_gpio,
890 if (!dm_gpio_is_valid(&i2c_bus->sda_gpio) ||
891 !dm_gpio_is_valid(&i2c_bus->scl_gpio) ||
893 dev_err(dev, "i2c bus %d at %lu, fail to request scl/sda gpio\n", bus->seq, i2c_bus->base);
898 ret = i2c_idle_bus(i2c_bus);
901 enable_i2c_clk(0, bus->seq);
906 * Pinmux settings are in board file now, until pinmux is supported,
907 * we can set pinmux here in probe function.
910 debug("i2c : controller bus %d at %lu , speed %d: ",
911 bus->seq, i2c_bus->base,
917 /* Sends: S Addr Wr [A|NA] P */
918 static int mxc_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
922 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
924 ret = i2c_init_transfer(i2c_bus, chip_addr, 0, 0);
926 debug("%s failed, ret = %d\n", __func__, ret);
930 i2c_imx_stop(i2c_bus);
935 static int mxc_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
937 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
939 ulong base = i2c_bus->base;
940 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
941 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
944 * Here the 3rd parameter addr and the 4th one alen are set to 0,
945 * because here we only want to send out chip address. The register
946 * address is wrapped in msg.
948 ret = i2c_init_transfer(i2c_bus, msg->addr, 0, 0);
950 debug("i2c_init_transfer error: %d\n", ret);
954 for (; nmsgs > 0; nmsgs--, msg++) {
955 bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
956 debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
957 if (msg->flags & I2C_M_RD)
958 ret = i2c_read_data(i2c_bus, msg->addr, msg->buf,
961 ret = i2c_write_data(i2c_bus, msg->addr, msg->buf,
967 ret = readb(base + (I2CR << reg_shift));
969 writeb(ret, base + (I2CR << reg_shift));
971 ret = tx_byte(i2c_bus, (msg->addr << 1) | 1);
973 i2c_imx_stop(i2c_bus);
981 debug("i2c_write: error sending\n");
983 i2c_imx_stop(i2c_bus);
988 static const struct dm_i2c_ops mxc_i2c_ops = {
989 .xfer = mxc_i2c_xfer,
990 .probe_chip = mxc_i2c_probe_chip,
991 .set_bus_speed = mxc_i2c_set_bus_speed,
994 static const struct udevice_id mxc_i2c_ids[] = {
995 { .compatible = "fsl,imx21-i2c", },
996 { .compatible = "fsl,vf610-i2c", .data = I2C_QUIRK_FLAG, },
1000 U_BOOT_DRIVER(i2c_mxc) = {
1003 .of_match = mxc_i2c_ids,
1004 .probe = mxc_i2c_probe,
1005 .priv_auto_alloc_size = sizeof(struct mxc_i2c_bus),
1006 .ops = &mxc_i2c_ops,