drivers/i2c/s3c24x0_i2c.c

21 #include <i2c.h>
29  * @param i2c- pointer to the appropriate i2c register bank.
35 static int WaitForXfer(struct s3c24x0_i2c *i2c)
40 		if (readl(&i2c->iiccon) & I2CCON_IRPND)
41 			return (readl(&i2c->iicstat) & I2CSTAT_NACK) ?
48 static void read_write_byte(struct s3c24x0_i2c *i2c)
50 	clrbits_le32(&i2c->iiccon, I2CCON_IRPND);
53 static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd)
71 	writel((div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0), &i2c->iiccon);
74 	writel(0, &i2c->iicstat);
75 	writel(slaveadd, &i2c->iicadd);
77 	writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat);
101 static int i2c_transfer(struct s3c24x0_i2c *i2c,
118 	while (readl(&i2c->iicstat) & I2CSTAT_BSY) {
123 	writel(readl(&i2c->iiccon) | I2CCON_ACKGEN, &i2c->iiccon);
126 	writel(chip, &i2c->iicds);
129 		       &i2c->iicstat);
132 		       &i2c->iicstat);
135 	result = WaitForXfer(i2c);
142 			writel(addr[i++], &i2c->iicds);
143 			read_write_byte(i2c);
144 			result = WaitForXfer(i2c);
154 			writel(data[i++], &i2c->iicds);
155 			read_write_byte(i2c);
156 			result = WaitForXfer(i2c);
166 			writel(chip, &i2c->iicds);
170 				&i2c->iicstat);
171 			read_write_byte(i2c);
172 			result = WaitForXfer(i2c);
181 				writel(readl(&i2c->iiccon)
183 				       &i2c->iiccon);
184 			read_write_byte(i2c);
185 			result = WaitForXfer(i2c);
186 			data[i++] = readl(&i2c->iicds);
200 	writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat);
201 	read_write_byte(i2c);
227 	struct s3c24x0_i2c *i2c = i2c_bus->regs;
234 		setbits_le32(&i2c->iiccon, I2CCON_ACKGEN);
238 	writel(addr, &i2c->iicds);
244 	writel(status, &i2c->iicstat);
246 		read_write_byte(i2c);
249 	ret = WaitForXfer(i2c);
257 				clrbits_le32(&i2c->iiccon, I2CCON_ACKGEN);
258 			read_write_byte(i2c);
259 			ret = WaitForXfer(i2c);
260 			msg->buf[i] = readl(&i2c->iicds);
266 			writel(msg->buf[i], &i2c->iicds);
267 			read_write_byte(i2c);
268 			ret = WaitForXfer(i2c);
280 	struct s3c24x0_i2c *i2c = i2c_bus->regs;
285 	while (readl(&i2c->iicstat) & I2CSTAT_BSY) {
296 	writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat);
297 	read_write_byte(i2c);
334 	{ .compatible = "samsung,s3c2440-i2c" },