drivers/i2c/rk_i2c.c

1 // SPDX-License-Identifier: GPL-2.0+
5  * (C) Copyright 2008-2014 Rockchip Electronics
13 #include <i2c.h>
16 #include <asm/arch/i2c.h>
21 /* i2c timerout */
25 /* rk i2c fifo max transfer bytes */
40  * @controller_type: i2c controller type
60 static void rk_i2c_set_clk(struct rk_i2c *i2c, uint32_t scl_rate)  in rk_i2c_set_clk()  argument
65 	/* First get i2c rate from pclk */  in rk_i2c_set_clk()
66 	i2c_rate = clk_get_rate(&i2c->clk);  in rk_i2c_set_clk()
68 	div = DIV_ROUND_UP(i2c_rate, scl_rate * 8) - 2;  in rk_i2c_set_clk()
73 	writel(I2C_CLKDIV_VAL(divl, divh), &i2c->regs->clkdiv);  in rk_i2c_set_clk()
75 	debug("rk_i2c_set_clk: i2c rate = %d, scl rate = %d\n", i2c_rate,  in rk_i2c_set_clk()
77 	debug("set i2c clk div = %d, divh = %d, divl = %d\n", div, divh, divl);  in rk_i2c_set_clk()
78 	debug("set clk(I2C_CLKDIV: 0x%08x)\n", readl(&i2c->regs->clkdiv));  in rk_i2c_set_clk()
86 	debug("i2c_con: 0x%08x\n", readl(&regs->con));  in rk_i2c_show_regs()
87 	debug("i2c_clkdiv: 0x%08x\n", readl(&regs->clkdiv));  in rk_i2c_show_regs()
88 	debug("i2c_mrxaddr: 0x%08x\n", readl(&regs->mrxaddr));  in rk_i2c_show_regs()
89 	debug("i2c_mrxraddR: 0x%08x\n", readl(&regs->mrxraddr));  in rk_i2c_show_regs()
90 	debug("i2c_mtxcnt: 0x%08x\n", readl(&regs->mtxcnt));  in rk_i2c_show_regs()
91 	debug("i2c_mrxcnt: 0x%08x\n", readl(&regs->mrxcnt));  in rk_i2c_show_regs()
92 	debug("i2c_ien: 0x%08x\n", readl(&regs->ien));  in rk_i2c_show_regs()
93 	debug("i2c_ipd: 0x%08x\n", readl(&regs->ipd));  in rk_i2c_show_regs()
94 	debug("i2c_fcnt: 0x%08x\n", readl(&regs->fcnt));  in rk_i2c_show_regs()
96 		debug("i2c_txdata%d: 0x%08x\n", i, readl(&regs->txdata[i]));  in rk_i2c_show_regs()
98 		debug("i2c_rxdata%d: 0x%08x\n", i, readl(&regs->rxdata[i]));  in rk_i2c_show_regs()
102 static int rk_i2c_send_start_bit(struct rk_i2c *i2c)  in rk_i2c_send_start_bit()  argument
104 	struct i2c_regs *regs = i2c->regs;  in rk_i2c_send_start_bit()
107 	debug("I2c Send Start bit.\n");  in rk_i2c_send_start_bit()
108 	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);  in rk_i2c_send_start_bit()
110 	writel(I2C_CON_EN | I2C_CON_START, &regs->con);  in rk_i2c_send_start_bit()
111 	writel(I2C_STARTIEN, &regs->ien);  in rk_i2c_send_start_bit()
115 		if (readl(&regs->ipd) & I2C_STARTIPD) {  in rk_i2c_send_start_bit()
116 			writel(I2C_STARTIPD, &regs->ipd);  in rk_i2c_send_start_bit()
120 			debug("I2C Send Start Bit Timeout\n");  in rk_i2c_send_start_bit()
122 			return -ETIMEDOUT;  in rk_i2c_send_start_bit()
130 static int rk_i2c_send_stop_bit(struct rk_i2c *i2c)  in rk_i2c_send_stop_bit()  argument
132 	struct i2c_regs *regs = i2c->regs;  in rk_i2c_send_stop_bit()
135 	debug("I2c Send Stop bit.\n");  in rk_i2c_send_stop_bit()
136 	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);  in rk_i2c_send_stop_bit()
138 	writel(I2C_CON_EN | I2C_CON_STOP, &regs->con);  in rk_i2c_send_stop_bit()
139 	writel(I2C_CON_STOP, &regs->ien);  in rk_i2c_send_stop_bit()
143 		if (readl(&regs->ipd) & I2C_STOPIPD) {  in rk_i2c_send_stop_bit()
144 			writel(I2C_STOPIPD, &regs->ipd);  in rk_i2c_send_stop_bit()
148 			debug("I2C Send Start Bit Timeout\n");  in rk_i2c_send_stop_bit()
150 			return -ETIMEDOUT;  in rk_i2c_send_stop_bit()
158 static inline void rk_i2c_disable(struct rk_i2c *i2c)  in rk_i2c_disable()  argument
160 	writel(0, &i2c->regs->con);  in rk_i2c_disable()
163 static int rk_i2c_read(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,  in rk_i2c_read()  argument
166 	struct i2c_regs *regs = i2c->regs;  in rk_i2c_read()
181 	err = rk_i2c_send_start_bit(i2c);  in rk_i2c_read()
185 	writel(I2C_MRXADDR_SET(1, chip << 1 | 1), &regs->mrxaddr);  in rk_i2c_read()
187 		writel(0, &regs->mrxraddr);  in rk_i2c_read()
189 		writel(I2C_MRXRADDR_SET(r_len, reg), &regs->mrxraddr);  in rk_i2c_read()
191 		debug("I2C Read: addr len %d not supported\n", r_len);  in rk_i2c_read()
192 		return -EIO;  in rk_i2c_read()
217 		writel(con, &regs->con);  in rk_i2c_read()
218 		writel(bytes_xferred, &regs->mrxcnt);  in rk_i2c_read()
219 		writel(I2C_MBRFIEN | I2C_NAKRCVIEN, &regs->ien);  in rk_i2c_read()
223 			if (readl(&regs->ipd) & I2C_NAKRCVIPD) {  in rk_i2c_read()
224 				writel(I2C_NAKRCVIPD, &regs->ipd);  in rk_i2c_read()
225 				err = -EREMOTEIO;  in rk_i2c_read()
227 			if (readl(&regs->ipd) & I2C_MBRFIPD) {  in rk_i2c_read()
228 				writel(I2C_MBRFIPD, &regs->ipd);  in rk_i2c_read()
232 				debug("I2C Read Data Timeout\n");  in rk_i2c_read()
233 				err =  -ETIMEDOUT;  in rk_i2c_read()
241 			rxdata = readl(&regs->rxdata[i]);  in rk_i2c_read()
242 			debug("I2c Read RXDATA[%d] = 0x%x\n", i, rxdata);  in rk_i2c_read()
250 		bytes_remain_len -= bytes_xferred;  in rk_i2c_read()
252 		debug("I2C Read bytes_remain_len %d\n", bytes_remain_len);  in rk_i2c_read()
256 	rk_i2c_send_stop_bit(i2c);  in rk_i2c_read()
257 	rk_i2c_disable(i2c);  in rk_i2c_read()
262 static int rk_i2c_write(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,  in rk_i2c_write()  argument
265 	struct i2c_regs *regs = i2c->regs;  in rk_i2c_write()
277 	err = rk_i2c_send_start_bit(i2c);  in rk_i2c_write()
298 						(0xff << ((j - 1) * 8))) << 8;  in rk_i2c_write()
303 			writel(txdata, &regs->txdata[i]);  in rk_i2c_write()
304 			debug("I2c Write TXDATA[%d] = 0x%08x\n", i, txdata);  in rk_i2c_write()
307 		writel(I2C_CON_EN | I2C_CON_MOD(I2C_MODE_TX), &regs->con);  in rk_i2c_write()
308 		writel(bytes_xferred, &regs->mtxcnt);  in rk_i2c_write()
309 		writel(I2C_MBTFIEN | I2C_NAKRCVIEN, &regs->ien);  in rk_i2c_write()
313 			if (readl(&regs->ipd) & I2C_NAKRCVIPD) {  in rk_i2c_write()
314 				writel(I2C_NAKRCVIPD, &regs->ipd);  in rk_i2c_write()
315 				err = -EREMOTEIO;  in rk_i2c_write()
317 			if (readl(&regs->ipd) & I2C_MBTFIPD) {  in rk_i2c_write()
318 				writel(I2C_MBTFIPD, &regs->ipd);  in rk_i2c_write()
322 				debug("I2C Write Data Timeout\n");  in rk_i2c_write()
323 				err =  -ETIMEDOUT;  in rk_i2c_write()
330 		bytes_remain_len -= bytes_xferred;  in rk_i2c_write()
331 		debug("I2C Write bytes_remain_len %d\n", bytes_remain_len);  in rk_i2c_write()
335 	rk_i2c_send_stop_bit(i2c);  in rk_i2c_write()
336 	rk_i2c_disable(i2c);  in rk_i2c_write()
344 	struct rk_i2c *i2c = dev_get_priv(bus);  in rockchip_i2c_xfer()  local
348 	for (; nmsgs > 0; nmsgs--, msg++) {  in rockchip_i2c_xfer()
349 		debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);  in rockchip_i2c_xfer()
350 		if (msg->flags & I2C_M_RD) {  in rockchip_i2c_xfer()
351 			ret = rk_i2c_read(i2c, msg->addr, 0, 0, msg->buf,  in rockchip_i2c_xfer()
352 					  msg->len);  in rockchip_i2c_xfer()
354 			ret = rk_i2c_write(i2c, msg->addr, 0, 0, msg->buf,  in rockchip_i2c_xfer()
355 					   msg->len);  in rockchip_i2c_xfer()
359 			return -EREMOTEIO;  in rockchip_i2c_xfer()
368 	struct rk_i2c *i2c = dev_get_priv(bus);  in rockchip_i2c_set_bus_speed()  local
370 	rk_i2c_set_clk(i2c, speed);  in rockchip_i2c_set_bus_speed()
380 	ret = clk_get_by_index(bus, 0, &priv->clk);  in rockchip_i2c_ofdata_to_platdata()
383 		      bus->name, ret);  in rockchip_i2c_ofdata_to_platdata()
398 	priv->regs = dev_read_addr_ptr(bus);  in rockchip_i2c_probe()
402 	if (soc_data->controller_type == RK_I2C_LEGACY) {  in rockchip_i2c_probe()
406 			 __func__, bus->name, ret);  in rockchip_i2c_probe()
416 		/* pinctrl will switch I2C to new type */  in rockchip_i2c_probe()
419 			debug("%s: Failed to switch I2C to new type %s: %d\n",  in rockchip_i2c_probe()
420 				__func__, bus->name, ret);  in rockchip_i2c_probe()
459 		.compatible = "rockchip,rk3066-i2c",
463 		.compatible = "rockchip,rk3188-i2c",
467 		.compatible = "rockchip,rk3228-i2c",
471 		.compatible = "rockchip,rk3288-i2c",
475 		.compatible = "rockchip,rk3328-i2c",
479 		.compatible = "rockchip,rk3399-i2c",