Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
488
drivers/sbus/char/bbc_i2c.c
Normal file
488
drivers/sbus/char/bbc_i2c.c
Normal file
@@ -0,0 +1,488 @@
|
||||
/* $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
|
||||
* platforms.
|
||||
*
|
||||
* Copyright (C) 2001 David S. Miller (davem@redhat.com)
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/wait.h>
|
||||
#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 <asm/bbc.h>
|
||||
|
||||
#include "bbc_i2c.h"
|
||||
|
||||
/* Convert this driver to use i2c bus layer someday... */
|
||||
#define I2C_PCF_PIN 0x80
|
||||
#define I2C_PCF_ESO 0x40
|
||||
#define I2C_PCF_ES1 0x20
|
||||
#define I2C_PCF_ES2 0x10
|
||||
#define I2C_PCF_ENI 0x08
|
||||
#define I2C_PCF_STA 0x04
|
||||
#define I2C_PCF_STO 0x02
|
||||
#define I2C_PCF_ACK 0x01
|
||||
|
||||
#define I2C_PCF_START (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_ENI | I2C_PCF_STA | I2C_PCF_ACK)
|
||||
#define I2C_PCF_STOP (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_STO | I2C_PCF_ACK)
|
||||
#define I2C_PCF_REPSTART ( I2C_PCF_ESO | I2C_PCF_STA | I2C_PCF_ACK)
|
||||
#define I2C_PCF_IDLE (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_ACK)
|
||||
|
||||
#define I2C_PCF_INI 0x40 /* 1 if not initialized */
|
||||
#define I2C_PCF_STS 0x20
|
||||
#define I2C_PCF_BER 0x10
|
||||
#define I2C_PCF_AD0 0x08
|
||||
#define I2C_PCF_LRB 0x08
|
||||
#define I2C_PCF_AAS 0x04
|
||||
#define I2C_PCF_LAB 0x02
|
||||
#define I2C_PCF_BB 0x01
|
||||
|
||||
/* The BBC devices have two I2C controllers. The first I2C controller
|
||||
* connects mainly to configuration proms (NVRAM, cpu configuration,
|
||||
* dimm types, etc.). Whereas the second I2C controller connects to
|
||||
* environmental control devices such as fans and temperature sensors.
|
||||
* 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)
|
||||
{
|
||||
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) {
|
||||
bp->devs[i].client_claimed = val;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#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 bbc_i2c_bus *bp = all_bbc_i2c;
|
||||
|
||||
while (bp != NULL) {
|
||||
if (find_device(bp, echild) != 0)
|
||||
break;
|
||||
bp = bp->next;
|
||||
}
|
||||
|
||||
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 NULL;
|
||||
}
|
||||
|
||||
struct bbc_i2c_client *bbc_i2c_attach(struct linux_ebus_child *echild)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = find_bus_for_device(echild);
|
||||
struct bbc_i2c_client *client;
|
||||
|
||||
if (!bp)
|
||||
return NULL;
|
||||
client = kmalloc(sizeof(*client), GFP_KERNEL);
|
||||
if (!client)
|
||||
return NULL;
|
||||
memset(client, 0, sizeof(*client));
|
||||
client->bp = bp;
|
||||
client->echild = echild;
|
||||
client->bus = echild->resource[0].start;
|
||||
client->address = echild->resource[1].start;
|
||||
|
||||
claim_device(bp, echild);
|
||||
|
||||
return client;
|
||||
}
|
||||
|
||||
void bbc_i2c_detach(struct bbc_i2c_client *client)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = client->bp;
|
||||
struct linux_ebus_child *echild = client->echild;
|
||||
|
||||
release_device(bp, echild);
|
||||
kfree(client);
|
||||
}
|
||||
|
||||
static int wait_for_pin(struct bbc_i2c_bus *bp, u8 *status)
|
||||
{
|
||||
DECLARE_WAITQUEUE(wait, current);
|
||||
int limit = 32;
|
||||
int ret = 1;
|
||||
|
||||
bp->waiting = 1;
|
||||
add_wait_queue(&bp->wq, &wait);
|
||||
while (limit-- > 0) {
|
||||
u8 val;
|
||||
|
||||
set_current_state(TASK_INTERRUPTIBLE);
|
||||
*status = val = readb(bp->i2c_control_regs + 0);
|
||||
if ((val & I2C_PCF_PIN) == 0) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
msleep_interruptible(250);
|
||||
}
|
||||
remove_wait_queue(&bp->wq, &wait);
|
||||
bp->waiting = 0;
|
||||
current->state = TASK_RUNNING;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int bbc_i2c_writeb(struct bbc_i2c_client *client, unsigned char val, int off)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = client->bp;
|
||||
int address = client->address;
|
||||
u8 status;
|
||||
int ret = -1;
|
||||
|
||||
if (bp->i2c_bussel_reg != NULL)
|
||||
writeb(client->bus, bp->i2c_bussel_reg);
|
||||
|
||||
writeb(address, bp->i2c_control_regs + 0x1);
|
||||
writeb(I2C_PCF_START, bp->i2c_control_regs + 0x0);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
writeb(off, bp->i2c_control_regs + 0x1);
|
||||
if (wait_for_pin(bp, &status) ||
|
||||
(status & I2C_PCF_LRB) != 0)
|
||||
goto out;
|
||||
|
||||
writeb(val, bp->i2c_control_regs + 0x1);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
ret = 0;
|
||||
|
||||
out:
|
||||
writeb(I2C_PCF_STOP, bp->i2c_control_regs + 0x0);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int bbc_i2c_readb(struct bbc_i2c_client *client, unsigned char *byte, int off)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = client->bp;
|
||||
unsigned char address = client->address, status;
|
||||
int ret = -1;
|
||||
|
||||
if (bp->i2c_bussel_reg != NULL)
|
||||
writeb(client->bus, bp->i2c_bussel_reg);
|
||||
|
||||
writeb(address, bp->i2c_control_regs + 0x1);
|
||||
writeb(I2C_PCF_START, bp->i2c_control_regs + 0x0);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
writeb(off, bp->i2c_control_regs + 0x1);
|
||||
if (wait_for_pin(bp, &status) ||
|
||||
(status & I2C_PCF_LRB) != 0)
|
||||
goto out;
|
||||
|
||||
writeb(I2C_PCF_STOP, bp->i2c_control_regs + 0x0);
|
||||
|
||||
address |= 0x1; /* READ */
|
||||
|
||||
writeb(address, bp->i2c_control_regs + 0x1);
|
||||
writeb(I2C_PCF_START, bp->i2c_control_regs + 0x0);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
/* Set PIN back to one so the device sends the first
|
||||
* byte.
|
||||
*/
|
||||
(void) readb(bp->i2c_control_regs + 0x1);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
writeb(I2C_PCF_ESO | I2C_PCF_ENI, bp->i2c_control_regs + 0x0);
|
||||
*byte = readb(bp->i2c_control_regs + 0x1);
|
||||
if (wait_for_pin(bp, &status))
|
||||
goto out;
|
||||
|
||||
ret = 0;
|
||||
|
||||
out:
|
||||
writeb(I2C_PCF_STOP, bp->i2c_control_regs + 0x0);
|
||||
(void) readb(bp->i2c_control_regs + 0x1);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int bbc_i2c_write_buf(struct bbc_i2c_client *client,
|
||||
char *buf, int len, int off)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
while (len > 0) {
|
||||
int err = bbc_i2c_writeb(client, *buf, off);
|
||||
|
||||
if (err < 0) {
|
||||
ret = err;
|
||||
break;
|
||||
}
|
||||
|
||||
len--;
|
||||
buf++;
|
||||
off++;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int bbc_i2c_read_buf(struct bbc_i2c_client *client,
|
||||
char *buf, int len, int off)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
while (len > 0) {
|
||||
int err = bbc_i2c_readb(client, buf, off);
|
||||
if (err < 0) {
|
||||
ret = err;
|
||||
break;
|
||||
}
|
||||
len--;
|
||||
buf++;
|
||||
off++;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(bbc_i2c_getdev);
|
||||
EXPORT_SYMBOL(bbc_i2c_attach);
|
||||
EXPORT_SYMBOL(bbc_i2c_detach);
|
||||
EXPORT_SYMBOL(bbc_i2c_writeb);
|
||||
EXPORT_SYMBOL(bbc_i2c_readb);
|
||||
EXPORT_SYMBOL(bbc_i2c_write_buf);
|
||||
EXPORT_SYMBOL(bbc_i2c_read_buf);
|
||||
|
||||
static irqreturn_t bbc_i2c_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = dev_id;
|
||||
|
||||
/* PIN going from set to clear is the only event which
|
||||
* makes the i2c assert an interrupt.
|
||||
*/
|
||||
if (bp->waiting &&
|
||||
!(readb(bp->i2c_control_regs + 0x0) & I2C_PCF_PIN))
|
||||
wake_up(&bp->wq);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void __init reset_one_i2c(struct bbc_i2c_bus *bp)
|
||||
{
|
||||
writeb(I2C_PCF_PIN, bp->i2c_control_regs + 0x0);
|
||||
writeb(bp->own, bp->i2c_control_regs + 0x1);
|
||||
writeb(I2C_PCF_PIN | I2C_PCF_ES1, bp->i2c_control_regs + 0x0);
|
||||
writeb(bp->clock, bp->i2c_control_regs + 0x1);
|
||||
writeb(I2C_PCF_IDLE, bp->i2c_control_regs + 0x0);
|
||||
}
|
||||
|
||||
static int __init attach_one_i2c(struct linux_ebus_device *edev, int index)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
|
||||
struct linux_ebus_child *echild;
|
||||
int entry;
|
||||
|
||||
if (!bp)
|
||||
return -ENOMEM;
|
||||
memset(bp, 0, sizeof(*bp));
|
||||
|
||||
bp->i2c_control_regs = ioremap(edev->resource[0].start, 0x2);
|
||||
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->waiting = 0;
|
||||
init_waitqueue_head(&bp->wq);
|
||||
if (request_irq(edev->irqs[0], bbc_i2c_interrupt,
|
||||
SA_SHIRQ, "bbc_i2c", bp))
|
||||
goto fail;
|
||||
|
||||
bp->index = index;
|
||||
bp->bus_edev = edev;
|
||||
|
||||
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;
|
||||
bp->devs[entry].client_claimed = 0;
|
||||
}
|
||||
|
||||
writeb(I2C_PCF_PIN, bp->i2c_control_regs + 0x0);
|
||||
bp->own = readb(bp->i2c_control_regs + 0x01);
|
||||
writeb(I2C_PCF_PIN | I2C_PCF_ES1, bp->i2c_control_regs + 0x0);
|
||||
bp->clock = readb(bp->i2c_control_regs + 0x01);
|
||||
|
||||
printk(KERN_INFO "i2c-%d: Regs at %p, %d devices, own %02x, clock %02x.\n",
|
||||
bp->index, bp->i2c_control_regs, entry, bp->own, bp->clock);
|
||||
|
||||
reset_one_i2c(bp);
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
if (bp->i2c_bussel_reg)
|
||||
iounmap(bp->i2c_bussel_reg);
|
||||
if (bp->i2c_control_regs)
|
||||
iounmap(bp->i2c_control_regs);
|
||||
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_name, "bbc"))
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
extern int bbc_envctrl_init(void);
|
||||
extern void bbc_envctrl_cleanup(void);
|
||||
static void bbc_i2c_cleanup(void);
|
||||
|
||||
static int __init bbc_i2c_init(void)
|
||||
{
|
||||
struct linux_ebus *ebus = NULL;
|
||||
struct linux_ebus_device *edev = NULL;
|
||||
int err, index = 0;
|
||||
|
||||
if (tlb_type != cheetah || !bbc_present())
|
||||
return -ENODEV;
|
||||
|
||||
for_each_ebus(ebus) {
|
||||
for_each_ebusdev(edev, ebus) {
|
||||
if (!strcmp(edev->prom_name, "i2c")) {
|
||||
if (!attach_one_i2c(edev, index))
|
||||
index++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!index)
|
||||
return -ENODEV;
|
||||
|
||||
err = bbc_envctrl_init();
|
||||
if (err)
|
||||
bbc_i2c_cleanup();
|
||||
return err;
|
||||
}
|
||||
|
||||
static void bbc_i2c_cleanup(void)
|
||||
{
|
||||
struct bbc_i2c_bus *bp = all_bbc_i2c;
|
||||
|
||||
bbc_envctrl_cleanup();
|
||||
|
||||
while (bp != NULL) {
|
||||
struct bbc_i2c_bus *next = bp->next;
|
||||
|
||||
free_irq(bp->bus_edev->irqs[0], bp);
|
||||
|
||||
if (bp->i2c_bussel_reg)
|
||||
iounmap(bp->i2c_bussel_reg);
|
||||
if (bp->i2c_control_regs)
|
||||
iounmap(bp->i2c_control_regs);
|
||||
|
||||
kfree(bp);
|
||||
|
||||
bp = next;
|
||||
}
|
||||
all_bbc_i2c = NULL;
|
||||
}
|
||||
|
||||
module_init(bbc_i2c_init);
|
||||
module_exit(bbc_i2c_cleanup);
|
||||
Reference in New Issue
Block a user