2 * Faraday I2C Controller
4 * (C) Copyright 2010 Faraday Technology
5 * Dante Su <dantesu@faraday-tech.com>
7 * SPDX-License-Identifier: GPL-2.0+
9 * NOTE: This driver should be converted to driver model before June 2017.
10 * Please see doc/driver-model/i2c-howto.txt for instructions.
19 #ifndef CONFIG_SYS_I2C_SPEED
20 #define CONFIG_SYS_I2C_SPEED 5000
23 #ifndef CONFIG_SYS_I2C_SLAVE
24 #define CONFIG_SYS_I2C_SLAVE 0
27 #ifndef CONFIG_FTI2C010_CLOCK
28 #define CONFIG_FTI2C010_CLOCK clk_get_rate("I2C")
31 #ifndef CONFIG_FTI2C010_TIMEOUT
32 #define CONFIG_FTI2C010_TIMEOUT 10 /* ms */
35 /* 7-bit dev address + 1-bit read/write */
36 #define I2C_RD(dev) ((((dev) << 1) & 0xfe) | 1)
37 #define I2C_WR(dev) (((dev) << 1) & 0xfe)
39 struct fti2c010_chip {
40 struct fti2c010_regs *regs;
43 static struct fti2c010_chip chip_list[] = {
45 .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE,
47 #ifdef CONFIG_FTI2C010_BASE1
49 .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE1,
52 #ifdef CONFIG_FTI2C010_BASE2
54 .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE2,
57 #ifdef CONFIG_FTI2C010_BASE3
59 .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE3,
64 static int fti2c010_reset(struct fti2c010_chip *chip)
68 struct fti2c010_regs *regs = chip->regs;
70 writel(CR_I2CRST, ®s->cr);
71 for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) {
72 if (!(readl(®s->cr) & CR_I2CRST)) {
79 printf("fti2c010: reset timeout\n");
84 static int fti2c010_wait(struct fti2c010_chip *chip, uint32_t mask)
88 struct fti2c010_regs *regs = chip->regs;
90 for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) {
91 stat = readl(®s->sr);
92 if ((stat & mask) == mask) {
101 static unsigned int set_i2c_bus_speed(struct fti2c010_chip *chip,
104 struct fti2c010_regs *regs = chip->regs;
105 unsigned int clk = CONFIG_FTI2C010_CLOCK;
106 unsigned int gsr = 0;
107 unsigned int tsr = 32;
108 unsigned int div, rate;
110 for (div = 0; div < 0x3ffff; ++div) {
111 /* SCLout = PCLK/(2*(COUNT + 2) + GSR) */
112 rate = clk / (2 * (div + 2) + gsr);
117 writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), ®s->tgsr);
118 writel(CDR_DIV(div), ®s->cdr);
124 * Initialization, must be called once on start up, may be called
125 * repeatedly to change the speed and slave addresses.
127 static void fti2c010_init(struct i2c_adapter *adap, int speed, int slaveaddr)
129 struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
134 #ifdef CONFIG_SYS_I2C_INIT_BOARD
135 /* Call board specific i2c bus reset routine before accessing the
136 * environment, which might be in a chip on that bus. For details
137 * about this problem see doc/I2C_Edge_Conditions.
144 fti2c010_reset(chip);
146 set_i2c_bus_speed(chip, speed);
148 /* slave init, don't care */
150 #ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
151 /* Call board specific i2c bus reset routine AFTER the bus has been
152 * initialized. Use either this callpoint or i2c_init_board;
153 * which is called before fti2c010_init operations.
154 * For details about this problem see doc/I2C_Edge_Conditions.
156 i2c_board_late_init();
161 * Probe the given I2C chip address. Returns 0 if a chip responded,
164 static int fti2c010_probe(struct i2c_adapter *adap, u8 dev)
166 struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
167 struct fti2c010_regs *regs = chip->regs;
170 /* 1. Select slave device (7bits Address + 1bit R/W) */
171 writel(I2C_WR(dev), ®s->dr);
172 writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
173 ret = fti2c010_wait(chip, SR_DT);
177 /* 2. Select device register */
178 writel(0, ®s->dr);
179 writel(CR_ENABLE | CR_TBEN, ®s->cr);
180 ret = fti2c010_wait(chip, SR_DT);
185 static void to_i2c_addr(u8 *buf, uint32_t addr, int alen)
189 if (!buf || alen <= 0)
194 shift = (alen - 1) * 8;
196 buf[i] = (u8)(addr >> shift);
201 static int fti2c010_read(struct i2c_adapter *adap,
202 u8 dev, uint addr, int alen, uchar *buf, int len)
204 struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
205 struct fti2c010_regs *regs = chip->regs;
207 uchar paddr[4] = { 0 };
209 to_i2c_addr(paddr, addr, alen);
212 * Phase A. Set register address
215 /* A.1 Select slave device (7bits Address + 1bit R/W) */
216 writel(I2C_WR(dev), ®s->dr);
217 writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
218 ret = fti2c010_wait(chip, SR_DT);
222 /* A.2 Select device register */
223 for (pos = 0; pos < alen; ++pos) {
224 uint32_t ctrl = CR_ENABLE | CR_TBEN;
226 writel(paddr[pos], ®s->dr);
227 writel(ctrl, ®s->cr);
228 ret = fti2c010_wait(chip, SR_DT);
234 * Phase B. Get register data
237 /* B.1 Select slave device (7bits Address + 1bit R/W) */
238 writel(I2C_RD(dev), ®s->dr);
239 writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
240 ret = fti2c010_wait(chip, SR_DT);
244 /* B.2 Get register data */
245 for (pos = 0; pos < len; ++pos) {
246 uint32_t ctrl = CR_ENABLE | CR_TBEN;
247 uint32_t stat = SR_DR;
249 if (pos == len - 1) {
250 ctrl |= CR_NAK | CR_STOP;
253 writel(ctrl, ®s->cr);
254 ret = fti2c010_wait(chip, stat);
257 buf[pos] = (uchar)(readl(®s->dr) & 0xFF);
263 static int fti2c010_write(struct i2c_adapter *adap,
264 u8 dev, uint addr, int alen, u8 *buf, int len)
266 struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
267 struct fti2c010_regs *regs = chip->regs;
269 uchar paddr[4] = { 0 };
271 to_i2c_addr(paddr, addr, alen);
274 * Phase A. Set register address
276 * A.1 Select slave device (7bits Address + 1bit R/W)
278 writel(I2C_WR(dev), ®s->dr);
279 writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
280 ret = fti2c010_wait(chip, SR_DT);
284 /* A.2 Select device register */
285 for (pos = 0; pos < alen; ++pos) {
286 uint32_t ctrl = CR_ENABLE | CR_TBEN;
288 writel(paddr[pos], ®s->dr);
289 writel(ctrl, ®s->cr);
290 ret = fti2c010_wait(chip, SR_DT);
296 * Phase B. Set register data
298 for (pos = 0; pos < len; ++pos) {
299 uint32_t ctrl = CR_ENABLE | CR_TBEN;
303 writel(buf[pos], ®s->dr);
304 writel(ctrl, ®s->cr);
305 ret = fti2c010_wait(chip, SR_DT);
313 static unsigned int fti2c010_set_bus_speed(struct i2c_adapter *adap,
316 struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
319 fti2c010_reset(chip);
320 ret = set_i2c_bus_speed(chip, speed);
326 * Register i2c adapters
328 U_BOOT_I2C_ADAP_COMPLETE(i2c_0, fti2c010_init, fti2c010_probe, fti2c010_read,
329 fti2c010_write, fti2c010_set_bus_speed,
330 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
332 #ifdef CONFIG_FTI2C010_BASE1
333 U_BOOT_I2C_ADAP_COMPLETE(i2c_1, fti2c010_init, fti2c010_probe, fti2c010_read,
334 fti2c010_write, fti2c010_set_bus_speed,
335 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
338 #ifdef CONFIG_FTI2C010_BASE2
339 U_BOOT_I2C_ADAP_COMPLETE(i2c_2, fti2c010_init, fti2c010_probe, fti2c010_read,
340 fti2c010_write, fti2c010_set_bus_speed,
341 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
344 #ifdef CONFIG_FTI2C010_BASE3
345 U_BOOT_I2C_ADAP_COMPLETE(i2c_3, fti2c010_init, fti2c010_probe, fti2c010_read,
346 fti2c010_write, fti2c010_set_bus_speed,
347 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,