5  * This is a combined i2c adapter and algorithm driver for the
7  * the same I2C unit (8240, 8245, 85xx).
26 #include <linux/i2c.h>
33 #define DRV_NAME "mpc-i2c"
75 	void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
80 static inline void writeccr(struct mpc_i2c *i2c, u32 x)  in writeccr()  argument
82 	writeb(x, i2c->base + MPC_I2C_CR);  in writeccr()
87 	struct mpc_i2c *i2c = dev_id;  in mpc_i2c_isr()  local
88 	if (readb(i2c->base + MPC_I2C_SR) & CSR_MIF) {  in mpc_i2c_isr()
90 		i2c->interrupt = readb(i2c->base + MPC_I2C_SR);  in mpc_i2c_isr()
91 		writeb(0, i2c->base + MPC_I2C_SR);  in mpc_i2c_isr()
92 		wake_up(&i2c->queue);  in mpc_i2c_isr()
102 static void mpc_i2c_fixup(struct mpc_i2c *i2c)  in mpc_i2c_fixup()  argument
105 	u32 delay_val = 1000000 / i2c->real_clk + 1;  in mpc_i2c_fixup()
111 		writeccr(i2c, 0);  in mpc_i2c_fixup()
112 		writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN);  in mpc_i2c_fixup()
114 		writeccr(i2c, CCR_MEN);  in mpc_i2c_fixup()
119 static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)  in i2c_wait()  argument
125 	if (!i2c->irq) {  in i2c_wait()
126 		while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {  in i2c_wait()
129 				dev_dbg(i2c->dev, "timeout\n");  in i2c_wait()
130 				writeccr(i2c, 0);  in i2c_wait()
135 		x = readb(i2c->base + MPC_I2C_SR);  in i2c_wait()
136 		writeb(0, i2c->base + MPC_I2C_SR);  in i2c_wait()
139 		result = wait_event_timeout(i2c->queue,  in i2c_wait()
140 			(i2c->interrupt & CSR_MIF), timeout);  in i2c_wait()
142 		if (unlikely(!(i2c->interrupt & CSR_MIF))) {  in i2c_wait()
143 			dev_dbg(i2c->dev, "wait timeout\n");  in i2c_wait()
144 			writeccr(i2c, 0);  in i2c_wait()
148 		x = i2c->interrupt;  in i2c_wait()
149 		i2c->interrupt = 0;  in i2c_wait()
156 		dev_dbg(i2c->dev, "unfinished\n");  in i2c_wait()
161 		dev_dbg(i2c->dev, "MAL\n");  in i2c_wait()
166 		dev_dbg(i2c->dev, "No RXAK\n");  in i2c_wait()
168 		writeccr(i2c, CCR_MEN);  in i2c_wait()
214 	 * We want to choose an FDR/DFSR that generates an I2C bus speed that  in mpc_i2c_get_fdr_52xx()
231 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_52xx()  argument
237 		dev_dbg(i2c->dev, "using fdr %d\n",  in mpc_i2c_setup_52xx()
238 			readb(i2c->base + MPC_I2C_FDR));  in mpc_i2c_setup_52xx()
242 	ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler, &i2c->real_clk);  in mpc_i2c_setup_52xx()
245 	writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);  in mpc_i2c_setup_52xx()
248 		dev_info(i2c->dev, "clock %u Hz (fdr=%d)\n", i2c->real_clk,  in mpc_i2c_setup_52xx()
253 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_52xx()  argument
261 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_512x()  argument
269 	/* Enable I2C interrupts for mpc5121 */  in mpc_i2c_setup_512x()
271 					    "fsl,mpc5121-i2c-ctrl");  in mpc_i2c_setup_512x()
275 			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */  in mpc_i2c_setup_512x()
285 	mpc_i2c_setup_52xx(node, i2c, clock, prescaler);  in mpc_i2c_setup_512x()
289 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_512x()  argument
359 	if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))  in mpc_i2c_get_fdr_8xxx()
366 	pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",  in mpc_i2c_get_fdr_8xxx()
370 	 * We want to choose an FDR/DFSR that generates an I2C bus speed that  in mpc_i2c_get_fdr_8xxx()
384 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_8xxx()  argument
390 		dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n",  in mpc_i2c_setup_8xxx()
391 			readb(i2c->base + MPC_I2C_DFSRR),  in mpc_i2c_setup_8xxx()
392 			readb(i2c->base + MPC_I2C_FDR));  in mpc_i2c_setup_8xxx()
396 	ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler, &i2c->real_clk);  in mpc_i2c_setup_8xxx()
399 	writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);  in mpc_i2c_setup_8xxx()
400 	writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);  in mpc_i2c_setup_8xxx()
403 		dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",  in mpc_i2c_setup_8xxx()
404 			 i2c->real_clk, fdr >> 8, fdr & 0xff);  in mpc_i2c_setup_8xxx()
409 					 struct mpc_i2c *i2c,  in mpc_i2c_setup_8xxx()  argument
415 static void mpc_i2c_start(struct mpc_i2c *i2c)  in mpc_i2c_start()  argument
418 	writeb(0, i2c->base + MPC_I2C_SR);  in mpc_i2c_start()
420 	writeccr(i2c, CCR_MEN);  in mpc_i2c_start()
423 static void mpc_i2c_stop(struct mpc_i2c *i2c)  in mpc_i2c_stop()  argument
425 	writeccr(i2c, CCR_MEN);  in mpc_i2c_stop()
428 static int mpc_write(struct mpc_i2c *i2c, int target,  in mpc_write()  argument
432 	unsigned timeout = i2c->adap.timeout;  in mpc_write()
436 	writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);  in mpc_write()
438 	writeb((target << 1), i2c->base + MPC_I2C_DR);  in mpc_write()
440 	result = i2c_wait(i2c, timeout, 1);  in mpc_write()
446 		writeb(data[i], i2c->base + MPC_I2C_DR);  in mpc_write()
448 		result = i2c_wait(i2c, timeout, 1);  in mpc_write()
456 static int mpc_read(struct mpc_i2c *i2c, int target,  in mpc_read()  argument
459 	unsigned timeout = i2c->adap.timeout;  in mpc_read()
464 	writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);  in mpc_read()
466 	writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);  in mpc_read()
468 	result = i2c_wait(i2c, timeout, 1);  in mpc_read()
474 			writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);  in mpc_read()
476 			writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA);  in mpc_read()
478 		readb(i2c->base + MPC_I2C_DR);  in mpc_read()
482 		result = i2c_wait(i2c, timeout, 0);  in mpc_read()
488 			writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);  in mpc_read()
491 			writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX);  in mpc_read()
492 		data[i] = readb(i2c->base + MPC_I2C_DR);  in mpc_read()
504 	struct mpc_i2c *i2c = i2c_get_adapdata(adap);  in mpc_xfer()  local
506 	mpc_i2c_start(i2c);  in mpc_xfer()
509 	while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {  in mpc_xfer()
511 			dev_dbg(i2c->dev, "Interrupted\n");  in mpc_xfer()
512 			writeccr(i2c, 0);  in mpc_xfer()
516 			u8 status = readb(i2c->base + MPC_I2C_SR);  in mpc_xfer()
518 			dev_dbg(i2c->dev, "timeout\n");  in mpc_xfer()
521 				       i2c->base + MPC_I2C_SR);  in mpc_xfer()
522 				mpc_i2c_fixup(i2c);  in mpc_xfer()
531 		dev_dbg(i2c->dev,  in mpc_xfer()
537 			    mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);  in mpc_xfer()
540 			    mpc_write(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);  in mpc_xfer()
542 	mpc_i2c_stop(i2c);  in mpc_xfer()
567 	struct mpc_i2c *i2c;  in fsl_i2c_probe()  local
577 	i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);  in fsl_i2c_probe()
578 	if (!i2c)  in fsl_i2c_probe()
581 	i2c->dev = &op->dev; /* for debug and error output */  in fsl_i2c_probe()
583 	init_waitqueue_head(&i2c->queue);  in fsl_i2c_probe()
585 	i2c->base = of_iomap(op->dev.of_node, 0);  in fsl_i2c_probe()
586 	if (!i2c->base) {  in fsl_i2c_probe()
587 		dev_err(i2c->dev, "failed to map controller\n");  in fsl_i2c_probe()
592 	i2c->irq = irq_of_parse_and_map(op->dev.of_node, 0);  in fsl_i2c_probe()
593 	if (i2c->irq) { /* no i2c->irq implies polling */  in fsl_i2c_probe()
594 		result = request_irq(i2c->irq, mpc_i2c_isr,  in fsl_i2c_probe()
595 				     IRQF_SHARED, "i2c-mpc", i2c);  in fsl_i2c_probe()
597 			dev_err(i2c->dev, "failed to attach interrupt\n");  in fsl_i2c_probe()
613 		data->setup(op->dev.of_node, i2c, clock, data->prescaler);  in fsl_i2c_probe()
617 			mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock, 0);  in fsl_i2c_probe()
626 	dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ);  in fsl_i2c_probe()
628 	dev_set_drvdata(&op->dev, i2c);  in fsl_i2c_probe()
630 	i2c->adap = mpc_ops;  in fsl_i2c_probe()
631 	i2c_set_adapdata(&i2c->adap, i2c);  in fsl_i2c_probe()
632 	i2c->adap.dev.parent = &op->dev;  in fsl_i2c_probe()
633 	i2c->adap.dev.of_node = of_node_get(op->dev.of_node);  in fsl_i2c_probe()
635 	result = i2c_add_adapter(&i2c->adap);  in fsl_i2c_probe()
637 		dev_err(i2c->dev, "failed to add adapter\n");  in fsl_i2c_probe()
640 	of_i2c_register_devices(&i2c->adap);  in fsl_i2c_probe()
646 	free_irq(i2c->irq, i2c);  in fsl_i2c_probe()
648 	irq_dispose_mapping(i2c->irq);  in fsl_i2c_probe()
649 	iounmap(i2c->base);  in fsl_i2c_probe()
651 	kfree(i2c);  in fsl_i2c_probe()
657 	struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);  in fsl_i2c_remove()  local
659 	i2c_del_adapter(&i2c->adap);  in fsl_i2c_remove()
662 	if (i2c->irq)  in fsl_i2c_remove()
663 		free_irq(i2c->irq, i2c);  in fsl_i2c_remove()
665 	irq_dispose_mapping(i2c->irq);  in fsl_i2c_remove()
666 	iounmap(i2c->base);  in fsl_i2c_remove()
667 	kfree(i2c);  in fsl_i2c_remove()
694 	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
695 	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
696 	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
697 	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
698 	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
699 	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
700 	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
702 	{.compatible = "fsl-i2c", },
721 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "