3  * Copyright (C) 2015-2016 Socionext Inc.
6  * SPDX-License-Identifier:	GPL-2.0+
25 	u32 dttx;			/* send FIFO (write-only) */
26 #define dtrx		dttx		/* receive FIFO (read-only) */
79 	writel(I2C_RST_RST, &regs->rst);  in reset_bus()
80 	ret = readl_poll_timeout(&regs->rst, val, !(val & I2C_RST_RST), 1);  in reset_bus()
92 	ret = readl_poll_timeout(&regs->sr, val, !(val & I2C_SR_DB), 100);  in check_device_busy()
109 		return -EINVAL;  in uniphier_fi2c_probe()
111 	priv->regs = devm_ioremap(dev, addr, SZ_128);  in uniphier_fi2c_probe()
112 	if (!priv->regs)  in uniphier_fi2c_probe()
113 		return -ENOMEM;  in uniphier_fi2c_probe()
115 	priv->fioclk = FIOCLK;  in uniphier_fi2c_probe()
118 	ret = reset_bus(priv->regs);  in uniphier_fi2c_probe()
122 	writel(I2C_BRST_FOEN | I2C_BRST_RSCLO, &priv->regs->brst);  in uniphier_fi2c_probe()
133 	ret = readl_poll_timeout(&dev->regs->intr, irq, irq & flags,  in wait_for_irq()
134 				 dev->timeout);  in wait_for_irq()
159 	writel(I2C_CR_MST | I2C_CR_STO, &dev->regs->cr);  in issue_stop()
161 	ret = check_device_busy(dev->regs);  in issue_stop()
173 	struct uniphier_fi2c_regs __iomem *regs = dev->regs;  in uniphier_fi2c_transmit()
177 	writel(I2C_DTTX_CMD | addr << 1, &regs->dttx);  in uniphier_fi2c_transmit()
179 	writel(irq_flags, &regs->ie);  in uniphier_fi2c_transmit()
180 	writel(irq_flags, &regs->ic);  in uniphier_fi2c_transmit()
183 	writel(I2C_CR_MST | I2C_CR_STA, &regs->cr);  in uniphier_fi2c_transmit()
189 	while (len--) {  in uniphier_fi2c_transmit()
191 		writel(*buf++, &regs->dttx);  in uniphier_fi2c_transmit()
193 		writel(irq_flags, &regs->ic);  in uniphier_fi2c_transmit()
201 	writel(irq_flags, &regs->ic);  in uniphier_fi2c_transmit()
214 	struct uniphier_fi2c_regs __iomem *regs = dev->regs;  in uniphier_fi2c_receive()
225 	writel(I2C_DTTX_CMD | I2C_DTTX_RD | addr << 1, &regs->dttx);  in uniphier_fi2c_receive()
227 	writel(0, &regs->rbc);  in uniphier_fi2c_receive()
228 	writel(irq_flags, &regs->ie);  in uniphier_fi2c_receive()
229 	writel(irq_flags, &regs->ic);  in uniphier_fi2c_receive()
233 	       &regs->cr);  in uniphier_fi2c_receive()
235 	while (len--) {  in uniphier_fi2c_receive()
240 		*buf++ = readl(&regs->dtrx);  in uniphier_fi2c_receive()
241 		debug("received %x\n", *(buf - 1));  in uniphier_fi2c_receive()
244 			writel(I2C_CR_MST | I2C_CR_NACK, &regs->cr);  in uniphier_fi2c_receive()
246 		writel(irq_flags, &regs->ic);  in uniphier_fi2c_receive()
250 	writel(irq_flags, &regs->ic);  in uniphier_fi2c_receive()
265 	ret = check_device_busy(dev->regs);  in uniphier_fi2c_xfer()
269 	for (; nmsgs > 0; nmsgs--, msg++) {  in uniphier_fi2c_xfer()
273 		if (msg->flags & I2C_M_RD)  in uniphier_fi2c_xfer()
274 			ret = uniphier_fi2c_receive(dev, msg->addr, msg->len,  in uniphier_fi2c_xfer()
275 						    msg->buf, &stop);  in uniphier_fi2c_xfer()
277 			ret = uniphier_fi2c_transmit(dev, msg->addr, msg->len,  in uniphier_fi2c_xfer()
278 						     msg->buf, &stop);  in uniphier_fi2c_xfer()
292 	struct uniphier_fi2c_regs __iomem *regs = dev->regs;  in uniphier_fi2c_set_bus_speed()
296 		return -EINVAL;  in uniphier_fi2c_set_bus_speed()
298 	ret = check_device_busy(dev->regs);  in uniphier_fi2c_set_bus_speed()
303 	writel(I2C_BRST_RSCLO, &regs->brst);  in uniphier_fi2c_set_bus_speed()
305 	clk_count = dev->fioclk / speed;  in uniphier_fi2c_set_bus_speed()
307 	writel(clk_count, &regs->cyc);  in uniphier_fi2c_set_bus_speed()
308 	writel(clk_count / 2, &regs->lctl);  in uniphier_fi2c_set_bus_speed()
309 	writel(clk_count / 2, &regs->ssut);  in uniphier_fi2c_set_bus_speed()
310 	writel(clk_count / 16, &regs->dsut);  in uniphier_fi2c_set_bus_speed()
312 	writel(I2C_BRST_FOEN | I2C_BRST_RSCLO, &regs->brst);  in uniphier_fi2c_set_bus_speed()
319 	dev->timeout = 100000000L / speed;  in uniphier_fi2c_set_bus_speed()
330 	{ .compatible = "socionext,uniphier-fi2c" },
335 	.name = "uniphier-fi2c",