Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Minor comment fix for misc_64.S
  [POWERPC] Use H_CEDE on non-SMT
  [POWERPC] force 64bit mode in fwnmi handlers to workaround firmware bugs
  [POWERPC] PMAC_APM_EMU should depend on ADB_PMU
  [POWERPC] Fix new interrupt code (MPIC detection)
  [POWERPC] Fix new interrupt code (MPIC endianness)
  [POWERPC] Add cpufreq support for Xserve G5
  [POWERPC] Xserve G5 thermal control fixes
  [POWERPC] Fix mem= handling when the memory limit is > RMO size
  [POWERPC] More offb/bootx fixes
  [POWERPC] Fix legacy_serial.c error handling on 32 bits
  [POWERPC] Fix default clock for udbg_16550
  [POWERPC] Fix non-MPIC CHRPs with CONFIG_SMP set
  [POWERPC] Fix 32 bits warning in prom_init.c
  [POWERPC] Workaround Pegasos incorrect ISA "ranges"
  [POWERPC] fix up front-LED Kconfig

6 files changed, 406 insertions, 179 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 556958ebbf0..b6fb167e20f 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -774,20 +774,6 @@ config BLK_DEV_IDEDMA_PMAC
 	  to transfer data to and from memory.  Saying Y is safe and improves
 	  performance.
 
-config BLK_DEV_IDE_PMAC_BLINK
-	bool "Blink laptop LED on drive activity (DEPRECATED)"
-	depends on BLK_DEV_IDE_PMAC && ADB_PMU
-	select ADB_PMU_LED
-	select LEDS_TRIGGERS
-	select LEDS_TRIGGER_IDE_DISK
-	help
-	  This option enables the use of the sleep LED as a hard drive
-	  activity LED.
-	  This option is deprecated, it only selects ADB_PMU_LED and
-	  LEDS_TRIGGER_IDE_DISK and changes the code in the new led class
-	  device to default to the ide-disk trigger (which should be set
-	  from userspace via sysfs).
-
 config BLK_DEV_IDE_SWARM
 	tristate "IDE for Sibyte evaluation boards"
 	depends on SIBYTE_SB1xxx_SOC
diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig
index d162307e309..d5d649f5ccd 100644
--- a/drivers/macintosh/Kconfig
+++ b/drivers/macintosh/Kconfig
@@ -90,6 +90,15 @@ config ADB_PMU_LED
 	  and the ide-disk LED trigger and configure appropriately through
 	  sysfs.
 
+config ADB_PMU_LED_IDE
+	bool "Use front LED as IDE LED by default"
+	depends on ADB_PMU_LED
+	select LEDS_TRIGGERS
+	select LEDS_TRIGGER_IDE_DISK
+	help
+	  This option makes the front LED default to the IDE trigger
+	  so that it blinks on IDE activity.
+
 config PMAC_SMU
 	bool "Support for SMU  based PowerMacs"
 	depends on PPC_PMAC64
@@ -100,7 +109,7 @@ config PMAC_SMU
 
 config PMAC_APM_EMU
 	tristate "APM emulation"
-	depends on PPC_PMAC && PPC32 && PM
+	depends on PPC_PMAC && PPC32 && PM && ADB_PMU
 
 config PMAC_MEDIABAY
 	bool "Support PowerBook hotswap media bay"
diff --git a/drivers/macintosh/therm_pm72.c b/drivers/macintosh/therm_pm72.c
index c1fe0b368f7..20bf67244e2 100644
--- a/drivers/macintosh/therm_pm72.c
+++ b/drivers/macintosh/therm_pm72.c
@@ -95,6 +95,17 @@
  *	- Use min/max macros here or there
  *	- Latest darwin updated U3H min fan speed to 20% PWM
  *
+ *  July. 06, 2006 : 1.3
+ *	- Fix setting of RPM fans on Xserve G5 (they were going too fast)
+ *      - Add missing slots fan control loop for Xserve G5
+ *	- Lower fixed slots fan speed from 50% to 40% on desktop G5s. We
+ *        still can't properly implement the control loop for these, so let's
+ *        reduce the noise a little bit, it appears that 40% still gives us
+ *        a pretty good air flow
+ *	- Add code to "tickle" the FCU regulary so it doesn't think that
+ *        we are gone while in fact, the machine just didn't need any fan
+ *        speed change lately
+ *
  */
 
 #include <linux/types.h>
@@ -121,7 +132,7 @@
 
 #include "therm_pm72.h"
 
-#define VERSION "1.2b2"
+#define VERSION "1.3"
 
 #undef DEBUG
 
@@ -146,6 +157,7 @@ static struct basckside_pid_params	backside_params;
 static struct backside_pid_state	backside_state;
 static struct drives_pid_state		drives_state;
 static struct dimm_pid_state		dimms_state;
+static struct slots_pid_state		slots_state;
 static int				state;
 static int				cpu_count;
 static int				cpu_pid_type;
@@ -154,7 +166,8 @@ static struct completion		ctrl_complete;
 static int				critical_state;
 static int				rackmac;
 static s32				dimm_output_clamp;
-
+static int 				fcu_rpm_shift;
+static int				fcu_tickle_ticks;
 static DECLARE_MUTEX(driver_lock);
 
 /*
@@ -495,13 +508,20 @@ static int start_fcu(void)
 	rc = fan_write_reg(0x2e, &buf, 1);
 	if (rc < 0)
 		return -EIO;
+	rc = fan_read_reg(0, &buf, 1);
+	if (rc < 0)
+		return -EIO;
+	fcu_rpm_shift = (buf == 1) ? 2 : 3;
+	printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n",
+	       fcu_rpm_shift);
+
 	return 0;
 }
 
 static int set_rpm_fan(int fan_index, int rpm)
 {
 	unsigned char buf[2];
-	int rc, id;
+	int rc, id, min, max;
 
 	if (fcu_fans[fan_index].type != FCU_FAN_RPM)
 		return -EINVAL;
@@ -509,12 +529,15 @@ static int set_rpm_fan(int fan_index, int rpm)
 	if (id == FCU_FAN_ABSENT_ID)
 		return -EINVAL;
 
-	if (rpm < 300)
-		rpm = 300;
-	else if (rpm > 8191)
-		rpm = 8191;
-	buf[0] = rpm >> 5;
-	buf[1] = rpm << 3;
+	min = 2400 >> fcu_rpm_shift;
+	max = 56000 >> fcu_rpm_shift;
+
+	if (rpm < min)
+		rpm = min;
+	else if (rpm > max)
+		rpm = max;
+	buf[0] = rpm >> (8 - fcu_rpm_shift);
+	buf[1] = rpm << fcu_rpm_shift;
 	rc = fan_write_reg(0x10 + (id * 2), buf, 2);
 	if (rc < 0)
 		return -EIO;
@@ -551,7 +574,7 @@ static int get_rpm_fan(int fan_index, int programmed)
 	if (rc != 2)
 		return -EIO;
 
-	return (buf[0] << 5) | buf[1] >> 3;
+	return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
 }
 
 static int set_pwm_fan(int fan_index, int pwm)
@@ -609,6 +632,26 @@ static int get_pwm_fan(int fan_index)
 	return (buf[0] * 1000) / 2559;
 }
 
+static void tickle_fcu(void)
+{
+	int pwm;
+
+	pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
+
+	DBG("FCU Tickle, slots fan is: %d\n", pwm);
+	if (pwm < 0)
+		pwm = 100;
+
+	if (!rackmac) {
+		pwm = SLOTS_FAN_DEFAULT_PWM;
+	} else if (pwm < SLOTS_PID_OUTPUT_MIN)
+		pwm = SLOTS_PID_OUTPUT_MIN;
+
+	/* That is hopefully enough to make the FCU happy */
+	set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm);
+}
+
+
 /*
  * Utility routine to read the CPU calibration EEPROM data
  * from the device-tree
@@ -715,6 +758,9 @@ BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
 BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
 BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
 
+BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp)
+BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm)
+
 BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
 
 static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
@@ -735,6 +781,9 @@ static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
 static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
 static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
 
+static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL);
+static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL);
+
 static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
 
 /*
@@ -1076,6 +1125,9 @@ static void do_monitor_cpu_rack(struct cpu_pid_state *state)
 	fan_min = dimm_output_clamp;
 	fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan);
 
+	DBG(" CPU min mpu = %d, min dimm = %d\n",
+	    state->mpu.rminn_intake_fan, dimm_output_clamp);
+
 	state->rpm = max(state->rpm, (int)fan_min);
 	state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan);
 	state->intake_rpm = state->rpm;
@@ -1374,7 +1426,8 @@ static void do_monitor_drives(struct drives_pid_state *state)
 	DBG("  current rpm: %d\n", state->rpm);
 
 	/* Get some sensor readings */
-	temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, DS1775_TEMP)) << 8;
+	temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
+						    DS1775_TEMP)) << 8;
 	state->last_temp = temp;
 	DBG("  temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
 	    FIX32TOPRINT(DRIVES_PID_INPUT_TARGET));
@@ -1575,7 +1628,7 @@ static int init_dimms_state(struct dimm_pid_state *state)
 }
 
 /*
- * Dispose of the state data for the drives control loop
+ * Dispose of the state data for the DIMM control loop
  */
 static void dispose_dimms_state(struct dimm_pid_state *state)
 {
@@ -1588,6 +1641,127 @@ static void dispose_dimms_state(struct dimm_pid_state *state)
 	state->monitor = NULL;
 }
 
+/*
+ * Slots fan control loop
+ */
+static void do_monitor_slots(struct slots_pid_state *state)
+{
+	s32 temp, integral, derivative;
+	s64 integ_p, deriv_p, prop_p, sum;
+	int i, rc;
+
+	if (--state->ticks != 0)
+		return;
+	state->ticks = SLOTS_PID_INTERVAL;
+
+	DBG("slots:\n");
+
+	/* Check fan status */
+	rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
+	if (rc < 0) {
+		printk(KERN_WARNING "Error %d reading slots fan !\n", rc);
+		/* XXX What do we do now ? */
+	} else
+		state->pwm = rc;
+	DBG("  current pwm: %d\n", state->pwm);
+
+	/* Get some sensor readings */
+	temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
+						    DS1775_TEMP)) << 8;
+	state->last_temp = temp;
+	DBG("  temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
+	    FIX32TOPRINT(SLOTS_PID_INPUT_TARGET));
+
+	/* Store temperature and error in history array */
+	state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE;
+	state->sample_history[state->cur_sample] = temp;
+	state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET;
+
+	/* If first loop, fill the history table */
+	if (state->first) {
+		for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) {
+			state->cur_sample = (state->cur_sample + 1) %
+				SLOTS_PID_HISTORY_SIZE;
+			state->sample_history[state->cur_sample] = temp;
+			state->error_history[state->cur_sample] =
+				temp - SLOTS_PID_INPUT_TARGET;
+		}
+		state->first = 0;
+	}
+
+	/* Calculate the integral term */
+	sum = 0;
+	integral = 0;
+	for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++)
+		integral += state->error_history[i];
+	integral *= SLOTS_PID_INTERVAL;
+	DBG("  integral: %08x\n", integral);
+	integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral;
+	DBG("   integ_p: %d\n", (int)(integ_p >> 36));
+	sum += integ_p;
+
+	/* Calculate the derivative term */
+	derivative = state->error_history[state->cur_sample] -
+		state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1)
+				    % SLOTS_PID_HISTORY_SIZE];
+	derivative /= SLOTS_PID_INTERVAL;
+	deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative;
+	DBG("   deriv_p: %d\n", (int)(deriv_p >> 36));
+	sum += deriv_p;
+
+	/* Calculate the proportional term */
+	prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
+	DBG("   prop_p: %d\n", (int)(prop_p >> 36));
+	sum += prop_p;
+
+	/* Scale sum */
+	sum >>= 36;
+
+	DBG("   sum: %d\n", (int)sum);
+	state->pwm = (s32)sum;
+
+	state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN);
+	state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX);
+
+	DBG("** DRIVES PWM: %d\n", (int)state->pwm);
+	set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm);
+}
+
+/*
+ * Initialize the state structure for the slots bay fan control loop
+ */
+static int init_slots_state(struct slots_pid_state *state)
+{
+	state->ticks = 1;
+	state->first = 1;
+	state->pwm = 50;
+
+	state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp");
+	if (state->monitor == NULL)
+		return -ENODEV;
+
+	device_create_file(&of_dev->dev, &dev_attr_slots_temperature);
+	device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
+
+	return 0;
+}
+
+/*
+ * Dispose of the state data for the slots control loop
+ */
+static void dispose_slots_state(struct slots_pid_state *state)
+{
+	if (state->monitor == NULL)
+		return;
+
+	device_remove_file(&of_dev->dev, &dev_attr_slots_temperature);
+	device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
+
+	detach_i2c_chip(state->monitor);
+	state->monitor = NULL;
+}
+
+
 static int call_critical_overtemp(void)
 {
 	char *argv[] = { critical_overtemp_path, NULL };
@@ -1617,14 +1791,17 @@ static int main_control_loop(void *x)
 		goto out;
 	}
 
-	/* Set the PCI fan once for now */
-	set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
+	/* Set the PCI fan once for now on non-RackMac */
+	if (!rackmac)
+		set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
 
 	/* Initialize ADCs */
 	initialize_adc(&cpu_state[0]);
 	if (cpu_state[1].monitor != NULL)
 		initialize_adc(&cpu_state[1]);
 
+	fcu_tickle_ticks = FCU_TICKLE_TICKS;
+
 	up(&driver_lock);
 
 	while (state == state_attached) {
@@ -1634,6 +1811,12 @@ static int main_control_loop(void *x)
 
 		down(&driver_lock);
 
+		/* Tickle the FCU just in case */
+		if (--fcu_tickle_ticks < 0) {
+			fcu_tickle_ticks = FCU_TICKLE_TICKS;
+			tickle_fcu();
+		}
+
 		/* First, we always calculate the new DIMMs state on an Xserve */
 		if (rackmac)
 			do_monitor_dimms(&dimms_state);
@@ -1654,7 +1837,9 @@ static int main_control_loop(void *x)
 		}
 		/* Then, the rest */
 		do_monitor_backside(&backside_state);
-		if (!rackmac)
+		if (rackmac)
+			do_monitor_slots(&slots_state);
+		else
 			do_monitor_drives(&drives_state);
 		up(&driver_lock);
 
@@ -1696,6 +1881,7 @@ static void dispose_control_loops(void)
 	dispose_cpu_state(&cpu_state[1]);
 	dispose_backside_state(&backside_state);
 	dispose_drives_state(&drives_state);
+	dispose_slots_state(&slots_state);
 	dispose_dimms_state(&dimms_state);
 }
 
@@ -1745,6 +1931,8 @@ static int create_control_loops(void)
 		goto fail;
 	if (rackmac && init_dimms_state(&dimms_state))
 		goto fail;
+	if (rackmac && init_slots_state(&slots_state))
+		goto fail;
 	if (!rackmac && init_drives_state(&drives_state))
 		goto fail;
 
diff --git a/drivers/macintosh/therm_pm72.h b/drivers/macintosh/therm_pm72.h
index fc7e9b7ecaf..393cc9df94e 100644
--- a/drivers/macintosh/therm_pm72.h
+++ b/drivers/macintosh/therm_pm72.h
@@ -105,6 +105,7 @@ static char * critical_overtemp_path = "/sbin/critical_overtemp";
 #define DRIVES_DALLAS_ID	0x94
 #define BACKSIDE_MAX_ID		0x98
 #define XSERVE_DIMMS_LM87	0x25a
+#define XSERVE_SLOTS_LM75	0x290
 
 /*
  * Some MAX6690, DS1775, LM87 register definitions
@@ -198,7 +199,7 @@ struct drives_pid_state
 
 #define SLOTS_FAN_PWM_DEFAULT_ID	2
 #define SLOTS_FAN_PWM_INDEX		2
-#define	SLOTS_FAN_DEFAULT_PWM		50 /* Do better here ! */
+#define	SLOTS_FAN_DEFAULT_PWM		40 /* Do better here ! */
 
 
 /*
@@ -206,7 +207,7 @@ struct drives_pid_state
  */
 #define DIMM_PID_G_d			0
 #define DIMM_PID_G_p			0
-#define DIMM_PID_G_r			0x6553600
+#define DIMM_PID_G_r			0x06553600
 #define DIMM_PID_INPUT_TARGET		3276800
 #define DIMM_PID_INTERVAL    		1
 #define DIMM_PID_OUTPUT_MAX		14000
@@ -226,6 +227,31 @@ struct dimm_pid_state
 };
 
 
+/*
+ * PID factors for the Xserve Slots control loop
+ */
+#define SLOTS_PID_G_d			0
+#define SLOTS_PID_G_p			0
+#define SLOTS_PID_G_r			0x00100000
+#define SLOTS_PID_INPUT_TARGET		3200000
+#define SLOTS_PID_INTERVAL    		1
+#define SLOTS_PID_OUTPUT_MAX		100
+#define SLOTS_PID_OUTPUT_MIN		20
+#define SLOTS_PID_HISTORY_SIZE		20
+
+struct slots_pid_state
+{
+	int			ticks;
+	struct i2c_client *	monitor;
+	s32	       		sample_history[SLOTS_PID_HISTORY_SIZE];
+	s32			error_history[SLOTS_PID_HISTORY_SIZE];
+	int			cur_sample;
+	s32			last_temp;
+	int			first;
+	int			pwm;
+};
+
+
 
 /* Desktops */
 
@@ -283,6 +309,9 @@ struct cpu_pid_state
 	s32			pump_max;
 };
 
+/* Tickle FCU every 10 seconds */
+#define FCU_TICKLE_TICKS	10
+
 /*
  * Driver state
  */
diff --git a/drivers/macintosh/via-pmu-led.c b/drivers/macintosh/via-pmu-led.c
index af8375ed0f5..5189d5454b1 100644
--- a/drivers/macintosh/via-pmu-led.c
+++ b/drivers/macintosh/via-pmu-led.c
@@ -74,7 +74,7 @@ static void pmu_led_set(struct led_classdev *led_cdev,
 
 static struct led_classdev pmu_led = {
 	.name = "pmu-front-led",
-#ifdef CONFIG_BLK_DEV_IDE_PMAC_BLINK
+#ifdef CONFIG_ADB_PMU_LED_IDE
 	.default_trigger = "ide-disk",
 #endif
 	.brightness_set = pmu_led_set,
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index ce5f3031b99..0013311e056 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -62,8 +62,6 @@ struct offb_par default_par;
      *  Interface used by the world
      */
 
-int offb_init(void);
-
 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			  u_int transp, struct fb_info *info);
 static int offb_blank(int blank, struct fb_info *info);
@@ -72,11 +70,6 @@ static int offb_blank(int blank, struct fb_info *info);
 extern boot_infos_t *boot_infos;
 #endif
 
-static void offb_init_nodriver(struct device_node *);
-static void offb_init_fb(const char *name, const char *full_name,
-			 int width, int height, int depth, int pitch,
-			 unsigned long address, struct device_node *dp);
-
 static struct fb_ops offb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_setcolreg	= offb_setcolreg,
@@ -229,123 +222,17 @@ static int offb_blank(int blank, struct fb_info *info)
 	return 0;
 }
 
-    /*
-     *  Initialisation
-     */
 
-int __init offb_init(void)
+static void __iomem *offb_map_reg(struct device_node *np, int index,
+				  unsigned long offset, unsigned long size)
 {
-	struct device_node *dp = NULL, *boot_disp = NULL;
-
-	if (fb_get_options("offb", NULL))
-		return -ENODEV;
+	struct resource r;
 
-	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
-		if (get_property(dp, "linux,opened", NULL) &&
-		    get_property(dp, "linux,boot-display", NULL)) {
-			boot_disp = dp;
-			offb_init_nodriver(dp);
-		}
-	}
-	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
-		if (get_property(dp, "linux,opened", NULL) &&
-		    dp != boot_disp)
-			offb_init_nodriver(dp);
-	}
-
-	return 0;
-}
-
-
-static void __init offb_init_nodriver(struct device_node *dp)
-{
-	unsigned int len;
-	int i, width = 640, height = 480, depth = 8, pitch = 640;
-	unsigned int flags, rsize, addr_prop = 0;
-	unsigned long max_size = 0;
-	u64 rstart, address = OF_BAD_ADDR;
-	u32 *pp, *addrp, *up;
-	u64 asize;
-
-	pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
-	if (pp == NULL)
-		pp = (u32 *)get_property(dp, "depth", &len);
-	if (pp && len == sizeof(u32))
-		depth = *pp;
-
-	pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
-	if (pp == NULL)
-		pp = (u32 *)get_property(dp, "width", &len);
-	if (pp && len == sizeof(u32))
-		width = *pp;
-
-	pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
-	if (pp == NULL)
-		pp = (u32 *)get_property(dp, "height", &len);
-	if (pp && len == sizeof(u32))
-		height = *pp;
-
-	pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
-	if (pp == NULL)
-		pp = (u32 *)get_property(dp, "linebytes", &len);
-	if (pp && len == sizeof(u32))
-		pitch = *pp;
-	else
-		pitch = width * ((depth + 7) / 8);
-
-	rsize = (unsigned long)pitch * (unsigned long)height;
-
-	/* Ok, now we try to figure out the address of the framebuffer.
-	 *
-	 * Unfortunately, Open Firmware doesn't provide a standard way to do
-	 * so. All we can do is a dodgy heuristic that happens to work in
-	 * practice. On most machines, the "address" property contains what
-	 * we need, though not on Matrox cards found in IBM machines. What I've
-	 * found that appears to give good results is to go through the PCI
-	 * ranges and pick one that is both big enough and if possible encloses
-	 * the "address" property. If none match, we pick the biggest
-	 */
-	up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
-	if (up == NULL)
-		up = (u32 *)get_property(dp, "address", &len);
-	if (up && len == sizeof(u32))
-		addr_prop = *up;
-
-	for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
-		     != NULL; i++) {
-		int match_addrp = 0;
-
-		if (!(flags & IORESOURCE_MEM))
-			continue;
-		if (asize < rsize)
-			continue;
-		rstart = of_translate_address(dp, addrp);
-		if (rstart == OF_BAD_ADDR)
-			continue;
-		if (addr_prop && (rstart <= addr_prop) &&
-		    ((rstart + asize) >= (addr_prop + rsize)))
-			match_addrp = 1;
-		if (match_addrp) {
-			address = addr_prop;
-			break;
-		}
-		if (rsize > max_size) {
-			max_size = rsize;
-			address = OF_BAD_ADDR;
- 		}
-
-		if (address == OF_BAD_ADDR)
-			address = rstart;
-	}
-	if (address == OF_BAD_ADDR && addr_prop)
-		address = (u64)addr_prop;
-	if (address != OF_BAD_ADDR) {
-		/* kludge for valkyrie */
-		if (strcmp(dp->name, "valkyrie") == 0)
-			address += 0x1000;
-		offb_init_fb(dp->name, dp->full_name, width, height, depth,
-			     pitch, address, dp);
-	}
+	if (of_address_to_resource(np, index, &r))
+		return 0;
+	if ((r.start + offset + size) > r.end)
+		return 0;
+	return ioremap(r.start + offset, size);
 }
 
 static void __init offb_init_fb(const char *name, const char *full_name,
@@ -402,45 +289,39 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 
 	par->cmap_type = cmap_unknown;
 	if (depth == 8) {
-
 		/* Palette hacks disabled for now */
-#if 0
 		if (dp && !strncmp(name, "ATY,Rage128", 11)) {
-			unsigned long regbase = dp->addrs[2].address;
-			par->cmap_adr = ioremap(regbase, 0x1FFF);
-			par->cmap_type = cmap_r128;
+			par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+			if (par->cmap_adr)
+				par->cmap_type = cmap_r128;
 		} else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 				  || !strncmp(name, "ATY,RageM3p12A", 14))) {
-			unsigned long regbase =
-			    dp->parent->addrs[2].address;
-			par->cmap_adr = ioremap(regbase, 0x1FFF);
-			par->cmap_type = cmap_M3A;
+			par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+			if (par->cmap_adr)
+				par->cmap_type = cmap_M3A;
 		} else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
-			unsigned long regbase =
-			    dp->parent->addrs[2].address;
-			par->cmap_adr = ioremap(regbase, 0x1FFF);
-			par->cmap_type = cmap_M3B;
+			par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+			if (par->cmap_adr)
+				par->cmap_type = cmap_M3B;
 		} else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
-			unsigned long regbase = dp->addrs[1].address;
-			par->cmap_adr = ioremap(regbase, 0x1FFF);
-			par->cmap_type = cmap_radeon;
+			par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
+			if (par->cmap_adr)
+				par->cmap_type = cmap_radeon;
 		} else if (!strncmp(name, "ATY,", 4)) {
 			unsigned long base = address & 0xff000000UL;
 			par->cmap_adr =
 			    ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 			par->cmap_data = par->cmap_adr + 1;
 			par->cmap_type = cmap_m64;
-		} else if (device_is_compatible(dp, "pci1014,b7")) {
-			unsigned long regbase = dp->addrs[0].address;
-			par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
-			par->cmap_type = cmap_gxt2000;
+		} else if (dp && device_is_compatible(dp, "pci1014,b7")) {
+			par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
+			if (par->cmap_adr)
+				par->cmap_type = cmap_gxt2000;
 		}
-#endif
-		fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
-		    : FB_VISUAL_STATIC_PSEUDOCOLOR;
+		fix->visual = (par->cmap_type != cmap_unknown) ?
+			FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 	} else
-		fix->visual =	/* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
-				   : */ FB_VISUAL_TRUECOLOR;
+		fix->visual = FB_VISUAL_TRUECOLOR;
 
 	var->xoffset = var->yoffset = 0;
 	switch (depth) {
@@ -520,5 +401,139 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 	       info->node, full_name);
 }
 
+
+static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
+{
+	unsigned int len;
+	int i, width = 640, height = 480, depth = 8, pitch = 640;
+	unsigned int flags, rsize, addr_prop = 0;
+	unsigned long max_size = 0;
+	u64 rstart, address = OF_BAD_ADDR;
+	u32 *pp, *addrp, *up;
+	u64 asize;
+
+	pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
+	if (pp == NULL)
+		pp = (u32 *)get_property(dp, "depth", &len);
+	if (pp && len == sizeof(u32))
+		depth = *pp;
+
+	pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
+	if (pp == NULL)
+		pp = (u32 *)get_property(dp, "width", &len);
+	if (pp && len == sizeof(u32))
+		width = *pp;
+
+	pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
+	if (pp == NULL)
+		pp = (u32 *)get_property(dp, "height", &len);
+	if (pp && len == sizeof(u32))
+		height = *pp;
+
+	pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
+	if (pp == NULL)
+		pp = (u32 *)get_property(dp, "linebytes", &len);
+	if (pp && len == sizeof(u32))
+		pitch = *pp;
+	else
+		pitch = width * ((depth + 7) / 8);
+
+	rsize = (unsigned long)pitch * (unsigned long)height;
+
+	/* Ok, now we try to figure out the address of the framebuffer.
+	 *
+	 * Unfortunately, Open Firmware doesn't provide a standard way to do
+	 * so. All we can do is a dodgy heuristic that happens to work in
+	 * practice. On most machines, the "address" property contains what
+	 * we need, though not on Matrox cards found in IBM machines. What I've
+	 * found that appears to give good results is to go through the PCI
+	 * ranges and pick one that is both big enough and if possible encloses
+	 * the "address" property. If none match, we pick the biggest
+	 */
+	up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
+	if (up == NULL)
+		up = (u32 *)get_property(dp, "address", &len);
+	if (up && len == sizeof(u32))
+		addr_prop = *up;
+
+	/* Hack for when BootX is passing us */
+	if (no_real_node)
+		goto skip_addr;
+
+	for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
+		     != NULL; i++) {
+		int match_addrp = 0;
+
+		if (!(flags & IORESOURCE_MEM))
+			continue;
+		if (asize < rsize)
+			continue;
+		rstart = of_translate_address(dp, addrp);
+		if (rstart == OF_BAD_ADDR)
+			continue;
+		if (addr_prop && (rstart <= addr_prop) &&
+		    ((rstart + asize) >= (addr_prop + rsize)))
+			match_addrp = 1;
+		if (match_addrp) {
+			address = addr_prop;
+			break;
+		}
+		if (rsize > max_size) {
+			max_size = rsize;
+			address = OF_BAD_ADDR;
+ 		}
+
+		if (address == OF_BAD_ADDR)
+			address = rstart;
+	}
+ skip_addr:
+	if (address == OF_BAD_ADDR && addr_prop)
+		address = (u64)addr_prop;
+	if (address != OF_BAD_ADDR) {
+		/* kludge for valkyrie */
+		if (strcmp(dp->name, "valkyrie") == 0)
+			address += 0x1000;
+		offb_init_fb(no_real_node ? "bootx" : dp->name,
+			     no_real_node ? "display" : dp->full_name,
+			     width, height, depth, pitch, address,
+			     no_real_node ? dp : NULL);
+	}
+}
+
+static int __init offb_init(void)
+{
+	struct device_node *dp = NULL, *boot_disp = NULL;
+
+	if (fb_get_options("offb", NULL))
+		return -ENODEV;
+
+	/* Check if we have a MacOS display without a node spec */
+	if (get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
+		/* The old code tried to work out which node was the MacOS
+		 * display based on the address. I'm dropping that since the
+		 * lack of a node spec only happens with old BootX versions
+		 * (users can update) and with this code, they'll still get
+		 * a display (just not the palette hacks).
+		 */
+		offb_init_nodriver(of_chosen, 1);
+	}
+
+	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
+		if (get_property(dp, "linux,opened", NULL) &&
+		    get_property(dp, "linux,boot-display", NULL)) {
+			boot_disp = dp;
+			offb_init_nodriver(dp, 0);
+		}
+	}
+	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
+		if (get_property(dp, "linux,opened", NULL) &&
+		    dp != boot_disp)
+			offb_init_nodriver(dp, 0);
+	}
+
+	return 0;
+}
+
+
 module_init(offb_init);
 MODULE_LICENSE("GPL");