1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright (C) 2012-2020  ASPEED Technology Inc.
50 	scl_low = (divider_ratio >> 1) - 1;  in get_clk_reg_val()
51 	scl_high = divider_ratio - scl_low - 2;  in get_clk_reg_val()
64 	writel(~0, &priv->regs->isr);  in ast_i2c_clear_interrupts()
72 	writel(0, &priv->regs->fcr);  in ast_i2c_init_bus()
73 	/* Enable Master Mode. Assuming single-master */  in ast_i2c_init_bus()
77 	       &priv->regs->fcr);  in ast_i2c_init_bus()
84 	       | I2CD_INTR_ABNORMAL, &priv->regs->icr);  in ast_i2c_init_bus()
92 	priv->regs = devfdt_get_addr_ptr(dev);  in ast_i2c_ofdata_to_platdata()
93 	if (IS_ERR(priv->regs))  in ast_i2c_ofdata_to_platdata()
94 		return PTR_ERR(priv->regs);  in ast_i2c_ofdata_to_platdata()
96 	ret = clk_get_by_index(dev, 0, &priv->clk);  in ast_i2c_ofdata_to_platdata()
98 		debug("%s: Can't get clock for %s: %d\n", __func__, dev->name,  in ast_i2c_ofdata_to_platdata()
108 //	struct ast2500_scu *scu;  in ast_i2c_probe()
110 	debug("Enabling I2C%u\n", dev->seq);  in ast_i2c_probe()
118 	//TODO scu reset and get clk  in ast_i2c_probe()
130 	while (!(readl(&priv->regs->isr) & flag) && timeout > 0) {  in ast_i2c_wait_isr()
132 		timeout -= I2C_SLEEP_STEP_US;  in ast_i2c_wait_isr()
137 		return -ETIMEDOUT;  in ast_i2c_wait_isr()
146 	writel(I2CD_M_STOP_CMD, &priv->regs->csr);  in ast_i2c_send_stop()
156 	u32 status = readl(&priv->regs->isr) & flag;  in ast_i2c_wait_tx()
160 		status = readl(&priv->regs->isr) & flag;  in ast_i2c_wait_tx()
162 		timeout -= I2C_SLEEP_STEP_US;  in ast_i2c_wait_tx()
166 		ret = -EREMOTEIO;  in ast_i2c_wait_tx()
169 		ret = -ETIMEDOUT;  in ast_i2c_wait_tx()
181 	writel(devaddr, &priv->regs->trbbr);  in ast_i2c_start_txn()
182 	writel(I2CD_M_START_CMD | I2CD_M_TX_CMD, &priv->regs->csr);  in ast_i2c_start_txn()
198 	for (; len > 0; len--, buffer++) {  in ast_i2c_read_data()
201 		writel(i2c_cmd, &priv->regs->csr);  in ast_i2c_read_data()
205 		*buffer = (readl(&priv->regs->trbbr) & I2CD_RX_DATA_MASK)  in ast_i2c_read_data()
226 	for (; len > 0; len--, buffer++) {  in ast_i2c_write_data()
227 		writel(*buffer, &priv->regs->trbbr);  in ast_i2c_write_data()
228 		writel(I2CD_M_TX_CMD, &priv->regs->csr);  in ast_i2c_write_data()
243 	struct ast_i2c_regs *regs = priv->regs;  in ast_i2c_deblock()
244 	u32 csr = readl(&regs->csr);  in ast_i2c_deblock()
259 		writel(I2CD_BUS_RECOVER_CMD, &regs->csr);  in ast_i2c_deblock()
278 	for (; nmsgs > 0; nmsgs--, msg++) {  in ast_i2c_xfer()
279 		if (msg->flags & I2C_M_RD) {  in ast_i2c_xfer()
281 			      msg->addr, msg->len, msg->flags);  in ast_i2c_xfer()
282 			ret = ast_i2c_read_data(dev, msg->addr, msg->buf,  in ast_i2c_xfer()
283 						msg->len, (nmsgs == 1));  in ast_i2c_xfer()
286 			      msg->addr, msg->len, msg->flags);  in ast_i2c_xfer()
287 			ret = ast_i2c_write_data(dev, msg->addr, msg->buf,  in ast_i2c_xfer()
288 						 msg->len, (nmsgs == 1));  in ast_i2c_xfer()
292 			return -EREMOTEIO;  in ast_i2c_xfer()
302 	struct ast_i2c_regs *regs = priv->regs;  in ast_i2c_set_speed()
305 	debug("Setting speed for I2C%d to <%u>\n", dev->seq, speed);  in ast_i2c_set_speed()
308 		return -EINVAL;  in ast_i2c_set_speed()
311 	i2c_rate = clk_get_rate(&priv->clk);  in ast_i2c_set_speed()
314 	priv->speed = speed;  in ast_i2c_set_speed()
317 		setbits_le32(&regs->fcr, I2CD_M_HIGH_SPEED_EN  in ast_i2c_set_speed()
320 		writel(HIGHSPEED_TTIMEOUT, &regs->cactcr2);  in ast_i2c_set_speed()
323 		writel(I2CD_NO_TIMEOUT_CTRL, &regs->cactcr2);  in ast_i2c_set_speed()
326 	writel(get_clk_reg_val(divider), &regs->cactcr1);  in ast_i2c_set_speed()
339 	{ .compatible = "aspeed,ast2400-i2c-bus" },
340 	{ .compatible = "aspeed,ast2500-i2c-bus" },
341 	{ .compatible = "aspeed,ast2600-i2c-bus" },