[PATCH] powerpc: Fix old g5 issues with windfarm

Some of the windfarm sensor modules can initialize on old machines that
don't have full windfarm support like non-dual core desktop G5s.
Unfortunately, by doing so, they would trigger a bug in their matching
algorithm causing them to attach to the wrong bus, thus triggering
issues with the i2c core and breaking the thermal driver.

This patch fixes the probing issue (so that they will work when a
windfarm port is done to these machines) and also prevents for now
windfarm to load at all on these machines that still use therm_pm72 to
avoid wasting resources.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c
index bb8d5efe19bfc456e3825459c63ff746a4215963..6c0ba04bc57a299caf6868d509fc5aa7ecb55cfa 100644 (file)
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -35,6 +35,8 @@
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
 
+#include <asm/prom.h>
+
 #include "windfarm.h"
 
 #define VERSION "0.2"
@@ -465,6 +467,11 @@ static int __init windfarm_core_init(void)
 {
        DBG("wf: core loaded\n");
 
+       /* Don't register on old machines that use therm_pm72 for now */
+       if (machine_is_compatible("PowerMac7,2") ||
+           machine_is_compatible("PowerMac7,3") ||
+           machine_is_compatible("RackMac3,1"))
+               return -ENODEV;
        platform_device_register(&wf_platform_device);
        return 0;
 }

diff --git a/drivers/macintosh/windfarm_cpufreq_clamp.c b/drivers/macintosh/windfarm_cpufreq_clamp.c
index 607dbaca69c96fbb2172556bc4a14e5ca72f93d6..81337cd16e80d1fc80f87ee17fb82aa88a03d00f 100644 (file)
--- a/drivers/macintosh/windfarm_cpufreq_clamp.c
+++ b/drivers/macintosh/windfarm_cpufreq_clamp.c
@@ -8,6 +8,8 @@
 #include <linux/wait.h>
 #include <linux/cpufreq.h>
 
+#include <asm/prom.h>
+
 #include "windfarm.h"
 
 #define VERSION "0.3"
@@ -74,6 +76,12 @@ static int __init wf_cpufreq_clamp_init(void)
 {
        struct wf_control *clamp;
 
+       /* Don't register on old machines that use therm_pm72 for now */
+       if (machine_is_compatible("PowerMac7,2") ||
+           machine_is_compatible("PowerMac7,3") ||
+           machine_is_compatible("RackMac3,1"))
+               return -ENODEV;
+
        clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
        if (clamp == NULL)
                return -ENOMEM;

diff --git a/drivers/macintosh/windfarm_lm75_sensor.c b/drivers/macintosh/windfarm_lm75_sensor.c
index 906d3ecae6e69e043a31835963c17695a61fdc4c..423bfa2432c02ad4939219c40e2a177f33cf0f8c 100644 (file)
--- a/drivers/macintosh/windfarm_lm75_sensor.c
+++ b/drivers/macintosh/windfarm_lm75_sensor.c
@@ -25,7 +25,7 @@
 
 #include "windfarm.h"
 
-#define VERSION "0.1"
+#define VERSION "0.2"
 
 #undef DEBUG
 
@@ -113,6 +113,7 @@ static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
                                             const char *loc)
 {
        struct wf_lm75_sensor *lm;
+       int rc;
 
        DBG("wf_lm75: creating  %s device at address 0x%02x\n",
            ds1775 ? "ds1775" : "lm75", addr);
@@ -139,9 +140,11 @@ static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
        lm->i2c.driver = &wf_lm75_driver;
        strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
 
-       if (i2c_attach_client(&lm->i2c)) {
-               printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
-                      ds1775 ? "ds1775" : "lm75", lm->i2c.name);
+       rc = i2c_attach_client(&lm->i2c);
+       if (rc) {
+               printk(KERN_ERR "windfarm: failed to attach %s %s to i2c,"
+                      " err %d\n", ds1775 ? "ds1775" : "lm75",
+                      lm->i2c.name, rc);
                goto fail;
        }
 
@@ -175,16 +178,22 @@ static int wf_lm75_attach(struct i2c_adapter *adapter)
             (dev = of_get_next_child(busnode, dev)) != NULL;) {
                const char *loc =
                        get_property(dev, "hwsensor-location", NULL);
-               u32 *reg = (u32 *)get_property(dev, "reg", NULL);
-               DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg);
-               if (loc == NULL || reg == NULL)
+               u8 addr;
+
+               /* We must re-match the adapter in order to properly check
+                * the channel on multibus setups
+                */
+               if (!pmac_i2c_match_adapter(dev, adapter))
+                       continue;
+               addr = pmac_i2c_get_dev_addr(dev);
+               if (loc == NULL || addr == 0)
                        continue;
                /* real lm75 */
                if (device_is_compatible(dev, "lm75"))
-                       wf_lm75_create(adapter, *reg, 0, loc);
+                       wf_lm75_create(adapter, addr, 0, loc);
                /* ds1775 (compatible, better resolution */
                else if (device_is_compatible(dev, "ds1775"))
-                       wf_lm75_create(adapter, *reg, 1, loc);
+                       wf_lm75_create(adapter, addr, 1, loc);
        }
        return 0;
 }
@@ -206,6 +215,11 @@ static int wf_lm75_detach(struct i2c_client *client)
 
 static int __init wf_lm75_sensor_init(void)
 {
+       /* Don't register on old machines that use therm_pm72 for now */
+       if (machine_is_compatible("PowerMac7,2") ||
+           machine_is_compatible("PowerMac7,3") ||
+           machine_is_compatible("RackMac3,1"))
+               return -ENODEV;
        return i2c_add_driver(&wf_lm75_driver);
 }
 

diff --git a/drivers/macintosh/windfarm_max6690_sensor.c b/drivers/macintosh/windfarm_max6690_sensor.c
index 5b9ad6ca7cba07e28996d4af2f3f703ad2321c0a..8e99d408fddd5c62db695acb61266fe9b70b9b88 100644 (file)
--- a/drivers/macintosh/windfarm_max6690_sensor.c
+++ b/drivers/macintosh/windfarm_max6690_sensor.c
@@ -17,7 +17,7 @@
 
 #include "windfarm.h"
 
-#define VERSION "0.1"
+#define VERSION "0.2"
 
 /* This currently only exports the external temperature sensor,
    since that's all the control loops need. */
@@ -81,7 +81,7 @@ static struct wf_sensor_ops wf_max6690_ops = {
 static void wf_max6690_create(struct i2c_adapter *adapter, u8 addr)
 {
        struct wf_6690_sensor *max;
-       char *name = "u4-temp";
+       char *name = "backside-temp";
 
        max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
        if (max == NULL) {
@@ -118,7 +118,6 @@ static int wf_max6690_attach(struct i2c_adapter *adapter)
        struct device_node *busnode, *dev = NULL;
        struct pmac_i2c_bus *bus;
        const char *loc;
-       u32 *reg;
 
        bus = pmac_i2c_adapter_to_bus(adapter);
        if (bus == NULL)
@@ -126,16 +125,23 @@ static int wf_max6690_attach(struct i2c_adapter *adapter)
        busnode = pmac_i2c_get_bus_node(bus);
 
        while ((dev = of_get_next_child(busnode, dev)) != NULL) {
+               u8 addr;
+
+               /* We must re-match the adapter in order to properly check
+                * the channel on multibus setups
+                */
+               if (!pmac_i2c_match_adapter(dev, adapter))
+                       continue;
                if (!device_is_compatible(dev, "max6690"))
                        continue;
+               addr = pmac_i2c_get_dev_addr(dev);
                loc = get_property(dev, "hwsensor-location", NULL);
-               reg = (u32 *) get_property(dev, "reg", NULL);
-               if (!loc || !reg)
+               if (loc == NULL || addr == 0)
                        continue;
-               printk("found max6690, loc=%s reg=%x\n", loc, *reg);
+               printk("found max6690, loc=%s addr=0x%02x\n", loc, addr);
                if (strcmp(loc, "BACKSIDE"))
                        continue;
-               wf_max6690_create(adapter, *reg);
+               wf_max6690_create(adapter, addr);
        }
 
        return 0;
@@ -153,6 +159,11 @@ static int wf_max6690_detach(struct i2c_client *client)
 
 static int __init wf_max6690_sensor_init(void)
 {
+       /* Don't register on old machines that use therm_pm72 for now */
+       if (machine_is_compatible("PowerMac7,2") ||
+           machine_is_compatible("PowerMac7,3") ||
+           machine_is_compatible("RackMac3,1"))
+               return -ENODEV;
        return i2c_add_driver(&wf_max6690_driver);
 }
 

diff --git a/drivers/macintosh/windfarm_pm112.c b/drivers/macintosh/windfarm_pm112.c
index c2a4e689c784e776fca5968561d6da4d23e0935a..17aec8e7476fb33d9412e6d5ed8d0c74593fbaa2 100644 (file)
--- a/drivers/macintosh/windfarm_pm112.c
+++ b/drivers/macintosh/windfarm_pm112.c
@@ -613,7 +613,7 @@ static void pm112_new_sensor(struct wf_sensor *sr)
        } else if (!strcmp(sr->name, "slots-power")) {
                if (slots_power == NULL && wf_get_sensor(sr) == 0)
                        slots_power = sr;
-       } else if (!strcmp(sr->name, "u4-temp")) {
+       } else if (!strcmp(sr->name, "backside-temp")) {
                if (u4_temp == NULL && wf_get_sensor(sr) == 0)
                        u4_temp = sr;
        } else