drivers/i2c/nx_i2c.c

4 #include <i2c.h>
77 /* s5pxx18 i2c must be reset before enabled */
124 	struct nx_i2c_regs *i2c = bus->regs;
158 	writel(delay, &i2c->iiclc);
167 	struct nx_i2c_regs *i2c = bus->regs;
196 	       &i2c->iiccon);
199 	writel(0, &i2c->iicstat);
200 	writel(0x00, &i2c->iicadd);
203 	writel(I2CSTAT_MTM | I2CSTAT_RXTXEN, &i2c->iicstat);
229 	bus->sda_delay = dev_read_s32_default(dev, "i2c-sda-delay-ns", 0);
238 	/* get regs = i2c base address */
246 	/* i2c node parsing */
257 /* i2c bus busy check */
258 static int i2c_is_busy(struct nx_i2c_regs *i2c)
263 	while (readl(&i2c->iicstat) & I2CSTAT_BSY) {
273 static void i2c_enable_irq(struct nx_i2c_regs *i2c)
277 	reg = readl(&i2c->iiccon);
279 	writel(reg, &i2c->iiccon);
283 static void i2c_clear_irq(struct nx_i2c_regs *i2c)
287 	reg = readl(&i2c->iiccon);
298 	writel(reg, &i2c->iiccon);
302 static void i2c_enable_ack(struct nx_i2c_regs *i2c)
306 	reg = readl(&i2c->iiccon);
308 	writel(reg, &i2c->iiccon);
313 	struct nx_i2c_regs *i2c = bus->regs;
318 		reg = readl(&i2c->iicstat);
322 		writel(reg, &i2c->iicstat);
323 		i2c_clear_irq(i2c);
325 		writel(STOPCON_NAG, &i2c->iicstopcon);
327 		i2c_clear_irq(i2c);
333 		writel(STOPCON_CLR, &i2c->iicstopcon);
338 		i2c_clear_irq(i2c);
341 		writel(I2CSTAT_MRM, &i2c->iicstat);
345 static int wait_for_xfer(struct nx_i2c_regs *i2c)
350 		if (readl(&i2c->iiccon) & I2CCON_IRPND)
352 			return (readl(&i2c->iicstat) & I2CSTAT_NACK) ?
359 static int i2c_transfer(struct nx_i2c_regs *i2c,
373 	i2c_enable_irq(i2c);
374 	i2c_enable_ack(i2c);
378 	writel(I2CSTAT_RXTXEN, &i2c->iicstat);
380 	writel(chip_addr, &i2c->iicds);
387 	writel(status, &i2c->iicstat);
389 		i2c_clear_irq(i2c);
392 	result = wait_for_xfer(i2c);
401 			writel(addr[i++], &i2c->iicds);
402 			i2c_clear_irq(i2c);
403 			result = wait_for_xfer(i2c);
417 			writel(data[i++], &i2c->iicds);
418 			i2c_clear_irq(i2c);
419 			result = wait_for_xfer(i2c);
428 			writel(chip_addr, &i2c->iicds);
432 			       I2CSTAT_SS, &i2c->iicstat);
433 			i2c_clear_irq(i2c);
434 			result = wait_for_xfer(i2c);
445 				clrbits_le32(&i2c->iiccon, I2CCON_ACKGEN);
447 			i2c_clear_irq(i2c);
448 			result = wait_for_xfer(i2c);
449 			data[i++] = readb(&i2c->iicds);
475 	struct nx_i2c_bus *i2c;
479 	i2c = dev_get_priv(dev);
480 	if (!i2c)
498 	ret = i2c_transfer(i2c->regs, I2C_READ, chip_addr << 1,
512 	struct nx_i2c_bus *i2c;
516 	i2c = dev_get_priv(dev);
517 	if (!i2c)
532 	ret = i2c_transfer(i2c->regs, I2C_WRITE, chip_addr << 1,
545 	struct nx_i2c_regs *i2c = bus->regs;
554 		ret = i2c_is_busy(i2c);
616 	{ .compatible = "nexell,s5pxx18-i2c" },