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-rw-r--r--arch/ppc/platforms/pmac_low_i2c.c511
1 files changed, 0 insertions, 511 deletions
diff --git a/arch/ppc/platforms/pmac_low_i2c.c b/arch/ppc/platforms/pmac_low_i2c.c
deleted file mode 100644
index 08583fce1692b6..00000000000000
--- a/arch/ppc/platforms/pmac_low_i2c.c
+++ /dev/null
@@ -1,511 +0,0 @@
-/*
- * arch/ppc/platforms/pmac_low_i2c.c
- *
- * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * This file contains some low-level i2c access routines that
- * need to be used by various bits of the PowerMac platform code
- * at times where the real asynchronous & interrupt driven driver
- * cannot be used. The API borrows some semantics from the darwin
- * driver in order to ease the implementation of the platform
- * properties parser
- */
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/adb.h>
-#include <linux/pmu.h>
-#include <asm/keylargo.h>
-#include <asm/uninorth.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/machdep.h>
-#include <asm/pmac_low_i2c.h>
-
-#define MAX_LOW_I2C_HOST 4
-
-#if 1
-#define DBG(x...) do {\
- printk(KERN_DEBUG "KW:" x); \
- } while(0)
-#else
-#define DBGG(x...)
-#endif
-
-struct low_i2c_host;
-
-typedef int (*low_i2c_func_t)(struct low_i2c_host *host, u8 addr, u8 sub, u8 *data, int len);
-
-struct low_i2c_host
-{
- struct device_node *np; /* OF device node */
- struct semaphore mutex; /* Access mutex for use by i2c-keywest */
- low_i2c_func_t func; /* Access function */
- int is_open : 1; /* Poor man's access control */
- int mode; /* Current mode */
- int channel; /* Current channel */
- int num_channels; /* Number of channels */
- void __iomem * base; /* For keywest-i2c, base address */
- int bsteps; /* And register stepping */
- int speed; /* And speed */
-};
-
-static struct low_i2c_host low_i2c_hosts[MAX_LOW_I2C_HOST];
-
-/* No locking is necessary on allocation, we are running way before
- * anything can race with us
- */
-static struct low_i2c_host *find_low_i2c_host(struct device_node *np)
-{
- int i;
-
- for (i = 0; i < MAX_LOW_I2C_HOST; i++)
- if (low_i2c_hosts[i].np == np)
- return &low_i2c_hosts[i];
- return NULL;
-}
-
-/*
- *
- * i2c-keywest implementation (UniNorth, U2, U3, Keylargo's)
- *
- */
-
-/*
- * Keywest i2c definitions borrowed from drivers/i2c/i2c-keywest.h,
- * should be moved somewhere in include/asm-ppc/
- */
-/* Register indices */
-typedef enum {
- reg_mode = 0,
- reg_control,
- reg_status,
- reg_isr,
- reg_ier,
- reg_addr,
- reg_subaddr,
- reg_data
-} reg_t;
-
-
-/* Mode register */
-#define KW_I2C_MODE_100KHZ 0x00
-#define KW_I2C_MODE_50KHZ 0x01
-#define KW_I2C_MODE_25KHZ 0x02
-#define KW_I2C_MODE_DUMB 0x00
-#define KW_I2C_MODE_STANDARD 0x04
-#define KW_I2C_MODE_STANDARDSUB 0x08
-#define KW_I2C_MODE_COMBINED 0x0C
-#define KW_I2C_MODE_MODE_MASK 0x0C
-#define KW_I2C_MODE_CHAN_MASK 0xF0
-
-/* Control register */
-#define KW_I2C_CTL_AAK 0x01
-#define KW_I2C_CTL_XADDR 0x02
-#define KW_I2C_CTL_STOP 0x04
-#define KW_I2C_CTL_START 0x08
-
-/* Status register */
-#define KW_I2C_STAT_BUSY 0x01
-#define KW_I2C_STAT_LAST_AAK 0x02
-#define KW_I2C_STAT_LAST_RW 0x04
-#define KW_I2C_STAT_SDA 0x08
-#define KW_I2C_STAT_SCL 0x10
-
-/* IER & ISR registers */
-#define KW_I2C_IRQ_DATA 0x01
-#define KW_I2C_IRQ_ADDR 0x02
-#define KW_I2C_IRQ_STOP 0x04
-#define KW_I2C_IRQ_START 0x08
-#define KW_I2C_IRQ_MASK 0x0F
-
-/* State machine states */
-enum {
- state_idle,
- state_addr,
- state_read,
- state_write,
- state_stop,
- state_dead
-};
-
-#define WRONG_STATE(name) do {\
- printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s (isr: %02x)\n", \
- name, __kw_state_names[state], isr); \
- } while(0)
-
-static const char *__kw_state_names[] = {
- "state_idle",
- "state_addr",
- "state_read",
- "state_write",
- "state_stop",
- "state_dead"
-};
-
-static inline u8 __kw_read_reg(struct low_i2c_host *host, reg_t reg)
-{
- return in_8(host->base + (((unsigned)reg) << host->bsteps));
-}
-
-static inline void __kw_write_reg(struct low_i2c_host *host, reg_t reg, u8 val)
-{
- out_8(host->base + (((unsigned)reg) << host->bsteps), val);
- (void)__kw_read_reg(host, reg_subaddr);
-}
-
-#define kw_write_reg(reg, val) __kw_write_reg(host, reg, val)
-#define kw_read_reg(reg) __kw_read_reg(host, reg)
-
-
-/* Don't schedule, the g5 fan controller is too
- * timing sensitive
- */
-static u8 kw_wait_interrupt(struct low_i2c_host* host)
-{
- int i;
- u8 isr;
-
- for (i = 0; i < 200000; i++) {
- isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK;
- if (isr != 0)
- return isr;
- udelay(1);
- }
- return isr;
-}
-
-static int kw_handle_interrupt(struct low_i2c_host *host, int state, int rw, int *rc, u8 **data, int *len, u8 isr)
-{
- u8 ack;
-
- if (isr == 0) {
- if (state != state_stop) {
- DBG("KW: Timeout !\n");
- *rc = -EIO;
- goto stop;
- }
- if (state == state_stop) {
- ack = kw_read_reg(reg_status);
- if (!(ack & KW_I2C_STAT_BUSY)) {
- state = state_idle;
- kw_write_reg(reg_ier, 0x00);
- }
- }
- return state;
- }
-
- if (isr & KW_I2C_IRQ_ADDR) {
- ack = kw_read_reg(reg_status);
- if (state != state_addr) {
- kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR);
- WRONG_STATE("KW_I2C_IRQ_ADDR");
- *rc = -EIO;
- goto stop;
- }
- if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
- *rc = -ENODEV;
- DBG("KW: NAK on address\n");
- return state_stop;
- } else {
- if (rw) {
- state = state_read;
- if (*len > 1)
- kw_write_reg(reg_control, KW_I2C_CTL_AAK);
- } else {
- state = state_write;
- kw_write_reg(reg_data, **data);
- (*data)++; (*len)--;
- }
- }
- kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR);
- }
-
- if (isr & KW_I2C_IRQ_DATA) {
- if (state == state_read) {
- **data = kw_read_reg(reg_data);
- (*data)++; (*len)--;
- kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
- if ((*len) == 0)
- state = state_stop;
- else if ((*len) == 1)
- kw_write_reg(reg_control, 0);
- } else if (state == state_write) {
- ack = kw_read_reg(reg_status);
- if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
- DBG("KW: nack on data write\n");
- *rc = -EIO;
- goto stop;
- } else if (*len) {
- kw_write_reg(reg_data, **data);
- (*data)++; (*len)--;
- } else {
- kw_write_reg(reg_control, KW_I2C_CTL_STOP);
- state = state_stop;
- *rc = 0;
- }
- kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
- } else {
- kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
- WRONG_STATE("KW_I2C_IRQ_DATA");
- if (state != state_stop) {
- *rc = -EIO;
- goto stop;
- }
- }
- }
-
- if (isr & KW_I2C_IRQ_STOP) {
- kw_write_reg(reg_isr, KW_I2C_IRQ_STOP);
- if (state != state_stop) {
- WRONG_STATE("KW_I2C_IRQ_STOP");
- *rc = -EIO;
- }
- return state_idle;
- }
-
- if (isr & KW_I2C_IRQ_START)
- kw_write_reg(reg_isr, KW_I2C_IRQ_START);
-
- return state;
-
- stop:
- kw_write_reg(reg_control, KW_I2C_CTL_STOP);
- return state_stop;
-}
-
-static int keywest_low_i2c_func(struct low_i2c_host *host, u8 addr, u8 subaddr, u8 *data, int len)
-{
- u8 mode_reg = host->speed;
- int state = state_addr;
- int rc = 0;
-
- /* Setup mode & subaddress if any */
- switch(host->mode) {
- case pmac_low_i2c_mode_dumb:
- printk(KERN_ERR "low_i2c: Dumb mode not supported !\n");
- return -EINVAL;
- case pmac_low_i2c_mode_std:
- mode_reg |= KW_I2C_MODE_STANDARD;
- break;
- case pmac_low_i2c_mode_stdsub:
- mode_reg |= KW_I2C_MODE_STANDARDSUB;
- kw_write_reg(reg_subaddr, subaddr);
- break;
- case pmac_low_i2c_mode_combined:
- mode_reg |= KW_I2C_MODE_COMBINED;
- kw_write_reg(reg_subaddr, subaddr);
- break;
- }
-
- /* Setup channel & clear pending irqs */
- kw_write_reg(reg_isr, kw_read_reg(reg_isr));
- kw_write_reg(reg_mode, mode_reg | (host->channel << 4));
- kw_write_reg(reg_status, 0);
-
- /* Set up address and r/w bit */
- kw_write_reg(reg_addr, addr);
-
- /* Start sending address & disable interrupt*/
- kw_write_reg(reg_ier, 0 /*KW_I2C_IRQ_MASK*/);
- kw_write_reg(reg_control, KW_I2C_CTL_XADDR);
-
- /* State machine, to turn into an interrupt handler */
- while(state != state_idle) {
- u8 isr = kw_wait_interrupt(host);
- state = kw_handle_interrupt(host, state, addr & 1, &rc, &data, &len, isr);
- }
-
- return rc;
-}
-
-static void keywest_low_i2c_add(struct device_node *np)
-{
- struct low_i2c_host *host = find_low_i2c_host(NULL);
- unsigned long *psteps, *prate, steps, aoffset = 0;
- struct device_node *parent;
-
- if (host == NULL) {
- printk(KERN_ERR "low_i2c: Can't allocate host for %s\n",
- np->full_name);
- return;
- }
- memset(host, 0, sizeof(*host));
-
- init_MUTEX(&host->mutex);
- host->np = of_node_get(np);
- psteps = (unsigned long *)get_property(np, "AAPL,address-step", NULL);
- steps = psteps ? (*psteps) : 0x10;
- for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++)
- steps >>= 1;
- parent = of_get_parent(np);
- host->num_channels = 1;
- if (parent && parent->name[0] == 'u') {
- host->num_channels = 2;
- aoffset = 3;
- }
- /* Select interface rate */
- host->speed = KW_I2C_MODE_100KHZ;
- prate = (unsigned long *)get_property(np, "AAPL,i2c-rate", NULL);
- if (prate) switch(*prate) {
- case 100:
- host->speed = KW_I2C_MODE_100KHZ;
- break;
- case 50:
- host->speed = KW_I2C_MODE_50KHZ;
- break;
- case 25:
- host->speed = KW_I2C_MODE_25KHZ;
- break;
- }
- host->mode = pmac_low_i2c_mode_std;
- host->base = ioremap(np->addrs[0].address + aoffset,
- np->addrs[0].size);
- host->func = keywest_low_i2c_func;
-}
-
-/*
- *
- * PMU implementation
- *
- */
-
-
-#ifdef CONFIG_ADB_PMU
-
-static int pmu_low_i2c_func(struct low_i2c_host *host, u8 addr, u8 sub, u8 *data, int len)
-{
- // TODO
- return -ENODEV;
-}
-
-static void pmu_low_i2c_add(struct device_node *np)
-{
- struct low_i2c_host *host = find_low_i2c_host(NULL);
-
- if (host == NULL) {
- printk(KERN_ERR "low_i2c: Can't allocate host for %s\n",
- np->full_name);
- return;
- }
- memset(host, 0, sizeof(*host));
-
- init_MUTEX(&host->mutex);
- host->np = of_node_get(np);
- host->num_channels = 3;
- host->mode = pmac_low_i2c_mode_std;
- host->func = pmu_low_i2c_func;
-}
-
-#endif /* CONFIG_ADB_PMU */
-
-void __init pmac_init_low_i2c(void)
-{
- struct device_node *np;
-
- /* Probe keywest-i2c busses */
- np = of_find_compatible_node(NULL, "i2c", "keywest-i2c");
- while(np) {
- keywest_low_i2c_add(np);
- np = of_find_compatible_node(np, "i2c", "keywest-i2c");
- }
-
-#ifdef CONFIG_ADB_PMU
- /* Probe PMU busses */
- np = of_find_node_by_name(NULL, "via-pmu");
- if (np)
- pmu_low_i2c_add(np);
-#endif /* CONFIG_ADB_PMU */
-
- /* TODO: Add CUDA support as well */
-}
-
-int pmac_low_i2c_lock(struct device_node *np)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
- down(&host->mutex);
- return 0;
-}
-EXPORT_SYMBOL(pmac_low_i2c_lock);
-
-int pmac_low_i2c_unlock(struct device_node *np)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
- up(&host->mutex);
- return 0;
-}
-EXPORT_SYMBOL(pmac_low_i2c_unlock);
-
-
-int pmac_low_i2c_open(struct device_node *np, int channel)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
-
- if (channel >= host->num_channels)
- return -EINVAL;
-
- down(&host->mutex);
- host->is_open = 1;
- host->channel = channel;
-
- return 0;
-}
-EXPORT_SYMBOL(pmac_low_i2c_open);
-
-int pmac_low_i2c_close(struct device_node *np)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
-
- host->is_open = 0;
- up(&host->mutex);
-
- return 0;
-}
-EXPORT_SYMBOL(pmac_low_i2c_close);
-
-int pmac_low_i2c_setmode(struct device_node *np, int mode)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
- WARN_ON(!host->is_open);
- host->mode = mode;
-
- return 0;
-}
-EXPORT_SYMBOL(pmac_low_i2c_setmode);
-
-int pmac_low_i2c_xfer(struct device_node *np, u8 addrdir, u8 subaddr, u8 *data, int len)
-{
- struct low_i2c_host *host = find_low_i2c_host(np);
-
- if (!host)
- return -ENODEV;
- WARN_ON(!host->is_open);
-
- return host->func(host, addrdir, subaddr, data, len);
-}
-EXPORT_SYMBOL(pmac_low_i2c_xfer);
-