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