bbc_i2c: Convert to pure OF driver.

This thing was a mess, who wrote this junk? :)

Luckily we'll soon have nice generic I2C layer drivers for this PCF
based I2C stuff on sparc64.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 106 insertions, 161 deletions

diff --git a/drivers/sbus/char/bbc_i2c.c b/drivers/sbus/char/bbc_i2c.c
index ac8ef2ce07f..af7f4af6c5f 100644
--- a/drivers/sbus/char/bbc_i2c.c
+++ b/drivers/sbus/char/bbc_i2c.c
@@ -1,8 +1,7 @@
-/* $Id: bbc_i2c.c,v 1.2 2001/04/02 09:59:08 davem Exp $
- * bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III
+/* bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III
  *            platforms.
  *
- * Copyright (C) 2001 David S. Miller (davem@redhat.com)
+ * Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
  */
 
 #include <linux/module.h>
@@ -14,9 +13,8 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
-#include <asm/oplib.h>
-#include <asm/ebus.h>
-#include <asm/spitfire.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <asm/bbc.h>
 #include <asm/io.h>
 
@@ -53,54 +51,12 @@
  * The second controller also connects to the smartcard reader, if present.
  */
 
-#define NUM_CHILDREN	8
-struct bbc_i2c_bus {
-	struct bbc_i2c_bus		*next;
-	int				index;
-	spinlock_t			lock;
-	void				__iomem *i2c_bussel_reg;
-	void				__iomem *i2c_control_regs;
-	unsigned char			own, clock;
-
-	wait_queue_head_t		wq;
-	volatile int			waiting;
-
-	struct linux_ebus_device	*bus_edev;
-	struct {
-		struct linux_ebus_child	*device;
-		int			client_claimed;
-	} devs[NUM_CHILDREN];
-};
-
-static struct bbc_i2c_bus *all_bbc_i2c;
-
-struct bbc_i2c_client {
-	struct bbc_i2c_bus	*bp;
-	struct linux_ebus_child	*echild;
-	int			bus;
-	int			address;
-};
-
-static int find_device(struct bbc_i2c_bus *bp, struct linux_ebus_child *echild)
+static void set_device_claimage(struct bbc_i2c_bus *bp, struct of_device *op, int val)
 {
 	int i;
 
 	for (i = 0; i < NUM_CHILDREN; i++) {
-		if (bp->devs[i].device == echild) {
-			if (bp->devs[i].client_claimed)
-				return 0;
-			return 1;
-		}
-	}
-	return 0;
-}
-
-static void set_device_claimage(struct bbc_i2c_bus *bp, struct linux_ebus_child *echild, int val)
-{
-	int i;
-
-	for (i = 0; i < NUM_CHILDREN; i++) {
-		if (bp->devs[i].device == echild) {
+		if (bp->devs[i].device == op) {
 			bp->devs[i].client_claimed = val;
 			return;
 		}
@@ -110,61 +66,47 @@ static void set_device_claimage(struct bbc_i2c_bus *bp, struct linux_ebus_child
 #define claim_device(BP,ECHILD)		set_device_claimage(BP,ECHILD,1)
 #define release_device(BP,ECHILD)	set_device_claimage(BP,ECHILD,0)
 
-static struct bbc_i2c_bus *find_bus_for_device(struct linux_ebus_child *echild)
+struct of_device *bbc_i2c_getdev(struct bbc_i2c_bus *bp, int index)
 {
-	struct bbc_i2c_bus *bp = all_bbc_i2c;
+	struct of_device *op = NULL;
+	int curidx = 0, i;
 
-	while (bp != NULL) {
-		if (find_device(bp, echild) != 0)
+	for (i = 0; i < NUM_CHILDREN; i++) {
+		if (!(op = bp->devs[i].device))
 			break;
-		bp = bp->next;
+		if (curidx == index)
+			goto out;
+		op = NULL;
+		curidx++;
 	}
 
-	return bp;
-}
-
-struct linux_ebus_child *bbc_i2c_getdev(int index)
-{
-	struct bbc_i2c_bus *bp = all_bbc_i2c;
-	struct linux_ebus_child *echild = NULL;
-	int curidx = 0;
-
-	while (bp != NULL) {
-		struct bbc_i2c_bus *next = bp->next;
-		int i;
-
-		for (i = 0; i < NUM_CHILDREN; i++) {
-			if (!(echild = bp->devs[i].device))
-				break;
-			if (curidx == index)
-				goto out;
-			echild = NULL;
-			curidx++;
-		}
-		bp = next;
-	}
 out:
 	if (curidx == index)
-		return echild;
+		return op;
 	return NULL;
 }
 
-struct bbc_i2c_client *bbc_i2c_attach(struct linux_ebus_child *echild)
+struct bbc_i2c_client *bbc_i2c_attach(struct bbc_i2c_bus *bp, struct of_device *op)
 {
-	struct bbc_i2c_bus *bp = find_bus_for_device(echild);
 	struct bbc_i2c_client *client;
+	const u32 *reg;
 
-	if (!bp)
-		return NULL;
 	client = kzalloc(sizeof(*client), GFP_KERNEL);
 	if (!client)
 		return NULL;
 	client->bp = bp;
-	client->echild = echild;
-	client->bus = echild->resource[0].start;
-	client->address = echild->resource[1].start;
+	client->op = op;
+
+	reg = of_get_property(op->node, "reg", NULL);
+	if (!reg) {
+		kfree(client);
+		return NULL;
+	}
 
-	claim_device(bp, echild);
+	client->bus = reg[0];
+	client->address = reg[1];
+
+	claim_device(bp, op);
 
 	return client;
 }
@@ -172,9 +114,9 @@ struct bbc_i2c_client *bbc_i2c_attach(struct linux_ebus_child *echild)
 void bbc_i2c_detach(struct bbc_i2c_client *client)
 {
 	struct bbc_i2c_bus *bp = client->bp;
-	struct linux_ebus_child *echild = client->echild;
+	struct of_device *op = client->op;
 
-	release_device(bp, echild);
+	release_device(bp, op);
 	kfree(client);
 }
 
@@ -355,44 +297,43 @@ static void __init reset_one_i2c(struct bbc_i2c_bus *bp)
 	writeb(I2C_PCF_IDLE, bp->i2c_control_regs + 0x0);
 }
 
-static int __init attach_one_i2c(struct linux_ebus_device *edev, int index)
+static struct bbc_i2c_bus * __init attach_one_i2c(struct of_device *op, int index)
 {
 	struct bbc_i2c_bus *bp;
-	struct linux_ebus_child *echild;
+	struct device_node *dp;
 	int entry;
 
 	bp = kzalloc(sizeof(*bp), GFP_KERNEL);
 	if (!bp)
-		return -ENOMEM;
+		return NULL;
 
-	bp->i2c_control_regs = ioremap(edev->resource[0].start, 0x2);
+	bp->i2c_control_regs = of_ioremap(&op->resource[0], 0, 0x2, "bbc_i2c_regs");
 	if (!bp->i2c_control_regs)
 		goto fail;
 
-	if (edev->num_addrs == 2) {
-		bp->i2c_bussel_reg = ioremap(edev->resource[1].start, 0x1);
-		if (!bp->i2c_bussel_reg)
-			goto fail;
-	}
+	bp->i2c_bussel_reg = of_ioremap(&op->resource[1], 0, 0x1, "bbc_i2c_bussel");
+	if (!bp->i2c_bussel_reg)
+		goto fail;
 
 	bp->waiting = 0;
 	init_waitqueue_head(&bp->wq);
-	if (request_irq(edev->irqs[0], bbc_i2c_interrupt,
+	if (request_irq(op->irqs[0], bbc_i2c_interrupt,
 			IRQF_SHARED, "bbc_i2c", bp))
 		goto fail;
 
 	bp->index = index;
-	bp->bus_edev = edev;
+	bp->op = op;
 
 	spin_lock_init(&bp->lock);
-	bp->next = all_bbc_i2c;
-	all_bbc_i2c = bp;
 
 	entry = 0;
-	for (echild = edev->children;
-	     echild && entry < 8;
-	     echild = echild->next, entry++) {
-		bp->devs[entry].device = echild;
+	for (dp = op->node->child;
+	     dp && entry < 8;
+	     dp = dp->sibling, entry++) {
+		struct of_device *child_op;
+
+		child_op = of_find_device_by_node(dp);
+		bp->devs[entry].device = child_op;
 		bp->devs[entry].client_claimed = 0;
 	}
 
@@ -406,86 +347,90 @@ static int __init attach_one_i2c(struct linux_ebus_device *edev, int index)
 
 	reset_one_i2c(bp);
 
-	return 0;
+	return bp;
 
 fail:
 	if (bp->i2c_bussel_reg)
-		iounmap(bp->i2c_bussel_reg);
+		of_iounmap(&op->resource[1], bp->i2c_bussel_reg, 1);
 	if (bp->i2c_control_regs)
-		iounmap(bp->i2c_control_regs);
+		of_iounmap(&op->resource[0], bp->i2c_control_regs, 2);
 	kfree(bp);
-	return -EINVAL;
-}
-
-static int __init bbc_present(void)
-{
-	struct linux_ebus *ebus = NULL;
-	struct linux_ebus_device *edev = NULL;
-
-	for_each_ebus(ebus) {
-		for_each_ebusdev(edev, ebus) {
-			if (!strcmp(edev->prom_node->name, "bbc"))
-				return 1;
-		}
-	}
-	return 0;
+	return NULL;
 }
 
-extern int bbc_envctrl_init(void);
-extern void bbc_envctrl_cleanup(void);
-static void bbc_i2c_cleanup(void);
+extern int bbc_envctrl_init(struct bbc_i2c_bus *bp);
+extern void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp);
 
-static int __init bbc_i2c_init(void)
+static int __devinit bbc_i2c_probe(struct of_device *op,
+				   const struct of_device_id *match)
 {
-	struct linux_ebus *ebus = NULL;
-	struct linux_ebus_device *edev = NULL;
+	struct bbc_i2c_bus *bp;
 	int err, index = 0;
 
-	if ((tlb_type != cheetah && tlb_type != cheetah_plus) ||
-	    !bbc_present())
-		return -ENODEV;
+	bp = attach_one_i2c(op, index);
+	if (!bp)
+		return -EINVAL;
 
-	for_each_ebus(ebus) {
-		for_each_ebusdev(edev, ebus) {
-			if (!strcmp(edev->prom_node->name, "i2c")) {
-				if (!attach_one_i2c(edev, index))
-					index++;
-			}
-		}
+	err = bbc_envctrl_init(bp);
+	if (err) {
+		free_irq(op->irqs[0], bp);
+		if (bp->i2c_bussel_reg)
+			of_iounmap(&op->resource[0], bp->i2c_bussel_reg, 1);
+		if (bp->i2c_control_regs)
+			of_iounmap(&op->resource[1], bp->i2c_control_regs, 2);
+		kfree(bp);
+	} else {
+		dev_set_drvdata(&op->dev, bp);
 	}
 
-	if (!index)
-		return -ENODEV;
-
-	err = bbc_envctrl_init();
-	if (err)
-		bbc_i2c_cleanup();
 	return err;
 }
 
-static void bbc_i2c_cleanup(void)
+static int __devexit bbc_i2c_remove(struct of_device *op)
 {
-	struct bbc_i2c_bus *bp = all_bbc_i2c;
+	struct bbc_i2c_bus *bp = dev_get_drvdata(&op->dev);
+
+	bbc_envctrl_cleanup(bp);
+
+	free_irq(op->irqs[0], bp);
 
-	bbc_envctrl_cleanup();
+	if (bp->i2c_bussel_reg)
+		of_iounmap(&op->resource[0], bp->i2c_bussel_reg, 1);
+	if (bp->i2c_control_regs)
+		of_iounmap(&op->resource[1], bp->i2c_control_regs, 2);
 
-	while (bp != NULL) {
-		struct bbc_i2c_bus *next = bp->next;
+	kfree(bp);
 
-		free_irq(bp->bus_edev->irqs[0], bp);
+	return 0;
+}
 
-		if (bp->i2c_bussel_reg)
-			iounmap(bp->i2c_bussel_reg);
-		if (bp->i2c_control_regs)
-			iounmap(bp->i2c_control_regs);
+static struct of_device_id bbc_i2c_match[] = {
+	{
+		.name = "i2c",
+		.compatible = "SUNW,bbc-i2c",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bbc_i2c_match);
 
-		kfree(bp);
+static struct of_platform_driver bbc_i2c_driver = {
+	.name		= "bbc_i2c",
+	.match_table	= bbc_i2c_match,
+	.probe		= bbc_i2c_probe,
+	.remove		= __devexit_p(bbc_i2c_remove),
+};
 
-		bp = next;
-	}
-	all_bbc_i2c = NULL;
+static int __init bbc_i2c_init(void)
+{
+	return of_register_driver(&bbc_i2c_driver, &of_bus_type);
+}
+
+static void __exit bbc_i2c_exit(void)
+{
+	of_unregister_driver(&bbc_i2c_driver);
 }
 
 module_init(bbc_i2c_init);
-module_exit(bbc_i2c_cleanup);
+module_exit(bbc_i2c_exit);
+
 MODULE_LICENSE("GPL");