drivers/i2c/i2c-cdns.c

3  * IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
5  * This file is based on: drivers/i2c/zynq_i2c.c,
6  * with added driver-model support and code cleanup.
8  * SPDX-License-Identifier:	GPL-2.0+
17 #include <i2c.h>
24 /* i2c register set */
71 #define CDNS_I2C_TRANSFER_SIZE		(CDNS_I2C_TRANSFER_SIZE_MAX - 3)
80 	int_status = readl(&cdns_i2c->interrupt_status);  in cdns_i2c_debug_status()
82 	status = readl(&cdns_i2c->status);  in cdns_i2c_debug_status()
111 		debug("TS%d ", readl(&cdns_i2c->transfer_size));  in cdns_i2c_debug_status()
136 		int_status = readl(&cdns_i2c->interrupt_status);  in cdns_i2c_wait()
143 	writel(int_status & mask, &cdns_i2c->interrupt_status);  in cdns_i2c_wait()
166 		return -EINVAL;  in cdns_i2c_calc_divs()
168 	last_error = -1;  in cdns_i2c_calc_divs()
174 		div_b--;  in cdns_i2c_calc_divs()
181 		current_error = ((actual_fscl > fscl) ? (actual_fscl - fscl) :  in cdns_i2c_calc_divs()
182 							(fscl - actual_fscl));  in cdns_i2c_calc_divs()
209 		return -EINVAL;  in cdns_i2c_set_bus_speed()
212 	ret = cdns_i2c_calc_divs(&speed_p, bus->input_freq, &div_a, &div_b);  in cdns_i2c_set_bus_speed()
217 	      __func__, div_a, div_b, bus->input_freq, speed, speed_p);  in cdns_i2c_set_bus_speed()
220 	       (div_a << CDNS_I2C_CONTROL_DIV_A_SHIFT), &bus->regs->control);  in cdns_i2c_set_bus_speed()
222 	/* Enable master mode, ack, and 7-bit addressing */  in cdns_i2c_set_bus_speed()
223 	setbits_le32(&bus->regs->control, CDNS_I2C_CONTROL_MS |  in cdns_i2c_set_bus_speed()
233 	struct cdns_i2c_regs *regs = i2c_bus->regs;  in cdns_i2c_write_data()
236 	setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO);  in cdns_i2c_write_data()
237 	clrbits_le32(&regs->control, CDNS_I2C_CONTROL_RW);  in cdns_i2c_write_data()
243 		setbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);  in cdns_i2c_write_data()
246 	writel(0xFF, &regs->interrupt_status);  in cdns_i2c_write_data()
248 	writel(addr, &regs->address);  in cdns_i2c_write_data()
250 	while (len--) {  in cdns_i2c_write_data()
251 		writel(*(cur_data++), &regs->data);  in cdns_i2c_write_data()
252 		if (readl(&regs->transfer_size) == CDNS_I2C_FIFO_DEPTH) {  in cdns_i2c_write_data()
255 				clrbits_le32(&regs->control,  in cdns_i2c_write_data()
257 				return -ETIMEDOUT;  in cdns_i2c_write_data()
263 	if (!i2c_bus->hold_flag)  in cdns_i2c_write_data()
264 		clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);  in cdns_i2c_write_data()
268 		return -ETIMEDOUT;  in cdns_i2c_write_data()
281 	struct cdns_i2c_regs *regs = i2c_bus->regs;  in cdns_i2c_read_data()
287 		return -EINVAL;  in cdns_i2c_read_data()
293 		setbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);  in cdns_i2c_read_data()
295 	setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO |  in cdns_i2c_read_data()
300 		writel(curr_recv_count, &regs->transfer_size);  in cdns_i2c_read_data()
302 		writel(recv_count, &regs->transfer_size);  in cdns_i2c_read_data()
306 	writel(addr, &regs->address);  in cdns_i2c_read_data()
310 	hold_quirk = (i2c_bus->quirks & CDNS_I2C_BROKEN_HOLD_BIT) && updatetx;  in cdns_i2c_read_data()
313 		while (readl(&regs->status) & CDNS_I2C_STATUS_RXDV) {  in cdns_i2c_read_data()
315 			    !i2c_bus->hold_flag) {  in cdns_i2c_read_data()
316 				clrbits_le32(&regs->control,  in cdns_i2c_read_data()
319 			*(cur_data)++ = readl(&regs->data);  in cdns_i2c_read_data()
320 			recv_count--;  in cdns_i2c_read_data()
321 			curr_recv_count--;  in cdns_i2c_read_data()
329 			while (readl(&regs->transfer_size) !=  in cdns_i2c_read_data()
330 				     (curr_recv_count - CDNS_I2C_FIFO_DEPTH))  in cdns_i2c_read_data()
336 			if ((recv_count - CDNS_I2C_FIFO_DEPTH) >  in cdns_i2c_read_data()
339 				       &regs->transfer_size);  in cdns_i2c_read_data()
343 				writel(recv_count - CDNS_I2C_FIFO_DEPTH,  in cdns_i2c_read_data()
344 				       &regs->transfer_size);  in cdns_i2c_read_data()
348 			writel(addr, &regs->address);  in cdns_i2c_read_data()
351 				       &regs->transfer_size);  in cdns_i2c_read_data()
354 				writel(recv_count, &regs->transfer_size);  in cdns_i2c_read_data()
362 		return -ETIMEDOUT;  in cdns_i2c_read_data()
374 	hold_quirk = !!(i2c_bus->quirks & CDNS_I2C_BROKEN_HOLD_BIT);  in cdns_i2c_xfer()
384 		for (count = 0; (count < nmsgs - 1) && hold_quirk; count++) {  in cdns_i2c_xfer()
387 				return -EOPNOTSUPP;  in cdns_i2c_xfer()
391 		i2c_bus->hold_flag = 1;  in cdns_i2c_xfer()
392 		setbits_le32(&i2c_bus->regs->control, CDNS_I2C_CONTROL_HOLD);  in cdns_i2c_xfer()
394 		i2c_bus->hold_flag = 0;  in cdns_i2c_xfer()
398 	for (; nmsgs > 0; nmsgs--, msg++) {  in cdns_i2c_xfer()
399 		debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);  in cdns_i2c_xfer()
400 		if (msg->flags & I2C_M_RD) {  in cdns_i2c_xfer()
401 			ret = cdns_i2c_read_data(i2c_bus, msg->addr, msg->buf,  in cdns_i2c_xfer()
402 						 msg->len);  in cdns_i2c_xfer()
404 			ret = cdns_i2c_write_data(i2c_bus, msg->addr, msg->buf,  in cdns_i2c_xfer()
405 						  msg->len);  in cdns_i2c_xfer()
409 			return -EREMOTEIO;  in cdns_i2c_xfer()
422 	i2c_bus->regs = (struct cdns_i2c_regs *)devfdt_get_addr(dev);  in cdns_i2c_ofdata_to_platdata()
423 	if (!i2c_bus->regs)  in cdns_i2c_ofdata_to_platdata()
424 		return -ENOMEM;  in cdns_i2c_ofdata_to_platdata()
427 		i2c_bus->quirks = pdata->quirks;  in cdns_i2c_ofdata_to_platdata()
429 	i2c_bus->input_freq = 100000000; /* TODO hardcode input freq for now */  in cdns_i2c_ofdata_to_platdata()
444 	{ .compatible = "cdns,i2c-r1p10", .data = (ulong)&r1p10_i2c_def },
445 	{ .compatible = "cdns,i2c-r1p14" },
450 	.name = "i2c-cdns",