2  * Copyright (C) 2012-2020  ASPEED Technology Inc.
6  * SPDX-License-Identifier:	GPL-2.0+
53 	scl_low = (divider_ratio >> 1) - 1;  in get_clk_reg_val()
54 	scl_high = divider_ratio - scl_low - 2;  in get_clk_reg_val()
67 	writel(~0, &priv->regs->isr);  in ast_i2c_clear_interrupts()
75 	writel(0, &priv->regs->fcr);  in ast_i2c_init_bus()
76 	/* Enable Master Mode. Assuming single-master */  in ast_i2c_init_bus()
80 	       &priv->regs->fcr);  in ast_i2c_init_bus()
87 	       | I2CD_INTR_ABNORMAL, &priv->regs->icr);  in ast_i2c_init_bus()
95 	priv->regs = devfdt_get_addr_ptr(dev);  in ast_i2c_ofdata_to_platdata()
96 	if (IS_ERR(priv->regs))  in ast_i2c_ofdata_to_platdata()
97 		return PTR_ERR(priv->regs);  in ast_i2c_ofdata_to_platdata()
99 	ret = clk_get_by_index(dev, 0, &priv->clk);  in ast_i2c_ofdata_to_platdata()
101 		debug("%s: Can't get clock for %s: %d\n", __func__, dev->name,  in ast_i2c_ofdata_to_platdata()
111 	struct ast2500_scu *scu;  in ast_i2c_probe()  local
113 	debug("Enabling I2C%u\n", dev->seq);  in ast_i2c_probe()
120 	scu = ast_get_scu();  in ast_i2c_probe()
121 	ast_scu_unlock(scu);  in ast_i2c_probe()
122 	clrbits_le32(&scu->sysreset_ctrl1, SCU_SYSRESET_I2C);  in ast_i2c_probe()
123 	ast_scu_lock(scu);  in ast_i2c_probe()
135 	while (!(readl(&priv->regs->isr) & flag) && timeout > 0) {  in ast_i2c_wait_isr()
137 		timeout -= I2C_SLEEP_STEP_US;  in ast_i2c_wait_isr()
142 		return -ETIMEDOUT;  in ast_i2c_wait_isr()
151 	writel(I2CD_M_STOP_CMD, &priv->regs->csr);  in ast_i2c_send_stop()
161 	u32 status = readl(&priv->regs->isr) & flag;  in ast_i2c_wait_tx()
165 		status = readl(&priv->regs->isr) & flag;  in ast_i2c_wait_tx()
167 		timeout -= I2C_SLEEP_STEP_US;  in ast_i2c_wait_tx()
171 		ret = -EREMOTEIO;  in ast_i2c_wait_tx()
174 		ret = -ETIMEDOUT;  in ast_i2c_wait_tx()
186 	writel(devaddr, &priv->regs->trbbr);  in ast_i2c_start_txn()
187 	writel(I2CD_M_START_CMD | I2CD_M_TX_CMD, &priv->regs->csr);  in ast_i2c_start_txn()
203 	for (; len > 0; len--, buffer++) {  in ast_i2c_read_data()
206 		writel(i2c_cmd, &priv->regs->csr);  in ast_i2c_read_data()
210 		*buffer = (readl(&priv->regs->trbbr) & I2CD_RX_DATA_MASK)  in ast_i2c_read_data()
231 	for (; len > 0; len--, buffer++) {  in ast_i2c_write_data()
232 		writel(*buffer, &priv->regs->trbbr);  in ast_i2c_write_data()
233 		writel(I2CD_M_TX_CMD, &priv->regs->csr);  in ast_i2c_write_data()
248 	struct ast_i2c_regs *regs = priv->regs;  in ast_i2c_deblock()
249 	u32 csr = readl(&regs->csr);  in ast_i2c_deblock()
264 		writel(I2CD_BUS_RECOVER_CMD, &regs->csr);  in ast_i2c_deblock()
283 	for (; nmsgs > 0; nmsgs--, msg++) {  in ast_i2c_xfer()
284 		if (msg->flags & I2C_M_RD) {  in ast_i2c_xfer()
286 			      msg->addr, msg->len, msg->flags);  in ast_i2c_xfer()
287 			ret = ast_i2c_read_data(dev, msg->addr, msg->buf,  in ast_i2c_xfer()
288 						msg->len, (nmsgs == 1));  in ast_i2c_xfer()
291 			      msg->addr, msg->len, msg->flags);  in ast_i2c_xfer()
292 			ret = ast_i2c_write_data(dev, msg->addr, msg->buf,  in ast_i2c_xfer()
293 						 msg->len, (nmsgs == 1));  in ast_i2c_xfer()
297 			return -EREMOTEIO;  in ast_i2c_xfer()
307 	struct ast_i2c_regs *regs = priv->regs;  in ast_i2c_set_speed()
310 	debug("Setting speed for I2C%d to <%u>\n", dev->seq, speed);  in ast_i2c_set_speed()
313 		return -EINVAL;  in ast_i2c_set_speed()
316 	i2c_rate = clk_get_rate(&priv->clk);  in ast_i2c_set_speed()
319 	priv->speed = speed;  in ast_i2c_set_speed()
322 		setbits_le32(&regs->fcr, I2CD_M_HIGH_SPEED_EN  in ast_i2c_set_speed()
325 		writel(HIGHSPEED_TTIMEOUT, &regs->cactcr2);  in ast_i2c_set_speed()
328 		writel(I2CD_NO_TIMEOUT_CTRL, &regs->cactcr2);  in ast_i2c_set_speed()
331 	writel(get_clk_reg_val(divider), &regs->cactcr1);  in ast_i2c_set_speed()
344 	{ .compatible = "aspeed,ast2400-i2c-bus" },
345 	{ .compatible = "aspeed,ast2500-i2c-bus" },