5  * Dante Su <dantesu@faraday-tech.com>
7  * SPDX-License-Identifier:	GPL-2.0+
10  * Please see doc/driver-model/i2c-howto.txt for instructions.
35 /* 7-bit dev address + 1-bit read/write */
64 static int fti2c010_reset(struct fti2c010_chip *chip)  in fti2c010_reset()  argument
67 	int ret = -1;  in fti2c010_reset()
68 	struct fti2c010_regs *regs = chip->regs;  in fti2c010_reset()
70 	writel(CR_I2CRST, &regs->cr);  in fti2c010_reset()
72 		if (!(readl(&regs->cr) & CR_I2CRST)) {  in fti2c010_reset()
84 static int fti2c010_wait(struct fti2c010_chip *chip, uint32_t mask)  in fti2c010_wait()  argument
86 	int ret = -1;  in fti2c010_wait()
88 	struct fti2c010_regs *regs = chip->regs;  in fti2c010_wait()
91 		stat = readl(&regs->sr);  in fti2c010_wait()
101 static unsigned int set_i2c_bus_speed(struct fti2c010_chip *chip,  in set_i2c_bus_speed()  argument
104 	struct fti2c010_regs *regs = chip->regs;  in set_i2c_bus_speed()
117 	writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), &regs->tgsr);  in set_i2c_bus_speed()
118 	writel(CDR_DIV(div), &regs->cdr);  in set_i2c_bus_speed()
129 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;  in fti2c010_init()  local
131 	if (adap->init_done)  in fti2c010_init()
136 	 * environment, which might be in a chip on that bus. For details  in fti2c010_init()
144 	fti2c010_reset(chip);  in fti2c010_init()
146 	set_i2c_bus_speed(chip, speed);  in fti2c010_init()
152  * Probe the given I2C chip address.  Returns 0 if a chip responded,
157 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;  in fti2c010_probe()  local
158 	struct fti2c010_regs *regs = chip->regs;  in fti2c010_probe()
161 	/* 1. Select slave device (7bits Address + 1bit R/W) */  in fti2c010_probe()
162 	writel(I2C_WR(dev), &regs->dr);  in fti2c010_probe()
163 	writel(CR_ENABLE | CR_TBEN | CR_START, &regs->cr);  in fti2c010_probe()
164 	ret = fti2c010_wait(chip, SR_DT);  in fti2c010_probe()
168 	/* 2. Select device register */  in fti2c010_probe()
169 	writel(0, &regs->dr);  in fti2c010_probe()
170 	writel(CR_ENABLE | CR_TBEN, &regs->cr);  in fti2c010_probe()
171 	ret = fti2c010_wait(chip, SR_DT);  in fti2c010_probe()
185 	shift = (alen - 1) * 8;  in to_i2c_addr()
186 	while (alen-- > 0) {  in to_i2c_addr()
188 		shift -= 8;  in to_i2c_addr()
195 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;  in fti2c010_read()  local
196 	struct fti2c010_regs *regs = chip->regs;  in fti2c010_read()
206 	/* A.1 Select slave device (7bits Address + 1bit R/W) */  in fti2c010_read()
207 	writel(I2C_WR(dev), &regs->dr);  in fti2c010_read()
208 	writel(CR_ENABLE | CR_TBEN | CR_START, &regs->cr);  in fti2c010_read()
209 	ret = fti2c010_wait(chip, SR_DT);  in fti2c010_read()
213 	/* A.2 Select device register */  in fti2c010_read()
217 		writel(paddr[pos], &regs->dr);  in fti2c010_read()
218 		writel(ctrl, &regs->cr);  in fti2c010_read()
219 		ret = fti2c010_wait(chip, SR_DT);  in fti2c010_read()
228 	/* B.1 Select slave device (7bits Address + 1bit R/W) */  in fti2c010_read()
229 	writel(I2C_RD(dev), &regs->dr);  in fti2c010_read()
230 	writel(CR_ENABLE | CR_TBEN | CR_START, &regs->cr);  in fti2c010_read()
231 	ret = fti2c010_wait(chip, SR_DT);  in fti2c010_read()
240 		if (pos == len - 1) {  in fti2c010_read()
244 		writel(ctrl, &regs->cr);  in fti2c010_read()
245 		ret = fti2c010_wait(chip, stat);  in fti2c010_read()
248 		buf[pos] = (uchar)(readl(&regs->dr) & 0xFF);  in fti2c010_read()
257 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;  in fti2c010_write()  local
258 	struct fti2c010_regs *regs = chip->regs;  in fti2c010_write()
267 	 * A.1 Select slave device (7bits Address + 1bit R/W)  in fti2c010_write()
269 	writel(I2C_WR(dev), &regs->dr);  in fti2c010_write()
270 	writel(CR_ENABLE | CR_TBEN | CR_START, &regs->cr);  in fti2c010_write()
271 	ret = fti2c010_wait(chip, SR_DT);  in fti2c010_write()
275 	/* A.2 Select device register */  in fti2c010_write()
279 		writel(paddr[pos], &regs->dr);  in fti2c010_write()
280 		writel(ctrl, &regs->cr);  in fti2c010_write()
281 		ret = fti2c010_wait(chip, SR_DT);  in fti2c010_write()
292 		if (pos == len - 1)  in fti2c010_write()
294 		writel(buf[pos], &regs->dr);  in fti2c010_write()
295 		writel(ctrl, &regs->cr);  in fti2c010_write()
296 		ret = fti2c010_wait(chip, SR_DT);  in fti2c010_write()
307 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;  in fti2c010_set_bus_speed()  local
310 	fti2c010_reset(chip);  in fti2c010_set_bus_speed()
311 	ret = set_i2c_bus_speed(chip, speed);  in fti2c010_set_bus_speed()