feature.c

linux内核源码

/*
 *  Copyright (C) 1996-2001 Paul Mackerras ([e-mail])
 *                          Ben. Herrenschmidt ([e-mail])
 *
 *  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.
 *
 *  TODO:
 *
 *   - Replace mdelay with some schedule loop if possible
 *   - Shorten some obfuscated delays on some routines (like modem
 *     power)
 *   - Refcount some clocks (see darwin)
 *   - Split split split...
 *
 */
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <asm/sections.h>
#include <asm/errno.h>
#include <asm/ohare.h>
#include <asm/heathrow.h>
#include <asm/keylargo.h>
#include <asm/uninorth.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>
#include <asm/pci-bridge.h>
#include <asm/pmac_low_i2c.h>

#undef DEBUG_FEATURE

#ifdef DEBUG_FEATURE
#define DBG(fmt...) printk(KERN_DEBUG fmt)
#else
#define DBG(fmt...)
#endif

#ifdef CONFIG_6xx
extern int powersave_lowspeed;
#endif

extern int powersave_nap;
extern struct device_node *k2_skiplist[2];

/*
 * We use a single global lock to protect accesses. Each driver has
 * to take care of its own locking
 */
DEFINE_SPINLOCK(feature_lock);

#define LOCK(flags)	spin_lock_irqsave(&feature_lock, flags);
#define UNLOCK(flags)	spin_unlock_irqrestore(&feature_lock, flags);


/*
 * Instance of some macio stuffs
 */
struct macio_chip macio_chips[MAX_MACIO_CHIPS];

struct macio_chip *macio_find(struct device_node *child, int type)
{
	while(child) {
		int	i;

		for (i=0; i < MAX_MACIO_CHIPS && macio_chips[i].of_node; i++)
			if (child == macio_chips[i].of_node &&
			    (!type || macio_chips[i].type == type))
				return &macio_chips[i];
		child = child->parent;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(macio_find);

static const char *macio_names[] =
{
	"Unknown",
	"Grand Central",
	"OHare",
	"OHareII",
	"Heathrow",
	"Gatwick",
	"Paddington",
	"Keylargo",
	"Pangea",
	"Intrepid",
	"K2",
	"Shasta",
};


struct device_node *uninorth_node;
u32 __iomem *uninorth_base;

static u32 uninorth_rev;
static int uninorth_maj;
static void __iomem *u3_ht_base;

/*
 * For each motherboard family, we have a table of functions pointers
 * that handle the various features.
 */

typedef long (*feature_call)(struct device_node *node, long param, long value);

struct feature_table_entry {
	unsigned int	selector;
	feature_call	function;
};

struct pmac_mb_def
{
	const char*			model_string;
	const char*			model_name;
	int				model_id;
	struct feature_table_entry*	features;
	unsigned long			board_flags;
};
static struct pmac_mb_def pmac_mb;

/*
 * Here are the chip specific feature functions
 */

static inline int simple_feature_tweak(struct device_node *node, int type,
				       int reg, u32 mask, int value)
{
	struct macio_chip*	macio;
	unsigned long		flags;

	macio = macio_find(node, type);
	if (!macio)
		return -ENODEV;
	LOCK(flags);
	if (value)
		MACIO_BIS(reg, mask);
	else
		MACIO_BIC(reg, mask);
	(void)MACIO_IN32(reg);
	UNLOCK(flags);

	return 0;
}

#ifndef CONFIG_POWER4

static long ohare_htw_scc_enable(struct device_node *node, long param,
				 long value)
{
	struct macio_chip*	macio;
	unsigned long		chan_mask;
	unsigned long		fcr;
	unsigned long		flags;
	int			htw, trans;
	unsigned long		rmask;

	macio = macio_find(node, 0);
	if (!macio)
		return -ENODEV;
	if (!strcmp(node->name, "ch-a"))
		chan_mask = MACIO_FLAG_SCCA_ON;
	else if (!strcmp(node->name, "ch-b"))
		chan_mask = MACIO_FLAG_SCCB_ON;
	else
		return -ENODEV;

	htw = (macio->type == macio_heathrow || macio->type == macio_paddington
		|| macio->type == macio_gatwick);
	/* On these machines, the HRW_SCC_TRANS_EN_N bit mustn't be touched */
	trans = (pmac_mb.model_id != PMAC_TYPE_YOSEMITE &&
		 pmac_mb.model_id != PMAC_TYPE_YIKES);
	if (value) {
#ifdef CONFIG_ADB_PMU
		if ((param & 0xfff) == PMAC_SCC_IRDA)
			pmu_enable_irled(1);
#endif /* CONFIG_ADB_PMU */
		LOCK(flags);
		fcr = MACIO_IN32(OHARE_FCR);
		/* Check if scc cell need enabling */
		if (!(fcr & OH_SCC_ENABLE)) {
			fcr |= OH_SCC_ENABLE;
			if (htw) {
				/* Side effect: this will also power up the
				 * modem, but it's too messy to figure out on which
				 * ports this controls the tranceiver and on which
				 * it controls the modem
				 */
				if (trans)
					fcr &= ~HRW_SCC_TRANS_EN_N;
				MACIO_OUT32(OHARE_FCR, fcr);
				fcr |= (rmask = HRW_RESET_SCC);
				MACIO_OUT32(OHARE_FCR, fcr);
			} else {
				fcr |= (rmask = OH_SCC_RESET);
				MACIO_OUT32(OHARE_FCR, fcr);
			}
			UNLOCK(flags);
			(void)MACIO_IN32(OHARE_FCR);
			mdelay(15);
			LOCK(flags);
			fcr &= ~rmask;
			MACIO_OUT32(OHARE_FCR, fcr);
		}
		if (chan_mask & MACIO_FLAG_SCCA_ON)
			fcr |= OH_SCCA_IO;
		if (chan_mask & MACIO_FLAG_SCCB_ON)
			fcr |= OH_SCCB_IO;
		MACIO_OUT32(OHARE_FCR, fcr);
		macio->flags |= chan_mask;
		UNLOCK(flags);
		if (param & PMAC_SCC_FLAG_XMON)
			macio->flags |= MACIO_FLAG_SCC_LOCKED;
	} else {
		if (macio->flags & MACIO_FLAG_SCC_LOCKED)
			return -EPERM;
		LOCK(flags);
		fcr = MACIO_IN32(OHARE_FCR);
		if (chan_mask & MACIO_FLAG_SCCA_ON)
			fcr &= ~OH_SCCA_IO;
		if (chan_mask & MACIO_FLAG_SCCB_ON)
			fcr &= ~OH_SCCB_IO;
		MACIO_OUT32(OHARE_FCR, fcr);
		if ((fcr & (OH_SCCA_IO | OH_SCCB_IO)) == 0) {
			fcr &= ~OH_SCC_ENABLE;
			if (htw && trans)
				fcr |= HRW_SCC_TRANS_EN_N;
			MACIO_OUT32(OHARE_FCR, fcr);
		}
		macio->flags &= ~(chan_mask);
		UNLOCK(flags);
		mdelay(10);
#ifdef CONFIG_ADB_PMU
		if ((param & 0xfff) == PMAC_SCC_IRDA)
			pmu_enable_irled(0);
#endif /* CONFIG_ADB_PMU */
	}
	return 0;
}

static long ohare_floppy_enable(struct device_node *node, long param,
				long value)
{
	return simple_feature_tweak(node, macio_ohare,
		OHARE_FCR, OH_FLOPPY_ENABLE, value);
}

static long ohare_mesh_enable(struct device_node *node, long param, long value)
{
	return simple_feature_tweak(node, macio_ohare,
		OHARE_FCR, OH_MESH_ENABLE, value);
}

static long ohare_ide_enable(struct device_node *node, long param, long value)
{
	switch(param) {
	case 0:
		/* For some reason, setting the bit in set_initial_features()
		 * doesn't stick. I'm still investigating... --BenH.
		 */
		if (value)
			simple_feature_tweak(node, macio_ohare,
				OHARE_FCR, OH_IOBUS_ENABLE, 1);
		return simple_feature_tweak(node, macio_ohare,
			OHARE_FCR, OH_IDE0_ENABLE, value);
	case 1:
		return simple_feature_tweak(node, macio_ohare,
			OHARE_FCR, OH_BAY_IDE_ENABLE, value);
	default:
		return -ENODEV;
	}
}

static long ohare_ide_reset(struct device_node *node, long param, long value)
{
	switch(param) {
	case 0:
		return simple_feature_tweak(node, macio_ohare,
			OHARE_FCR, OH_IDE0_RESET_N, !value);
	case 1:
		return simple_feature_tweak(node, macio_ohare,
			OHARE_FCR, OH_IDE1_RESET_N, !value);
	default:
		return -ENODEV;
	}
}

static long ohare_sleep_state(struct device_node *node, long param, long value)
{
	struct macio_chip*	macio = &macio_chips[0];

	if ((pmac_mb.board_flags & PMAC_MB_CAN_SLEEP) == 0)
		return -EPERM;
	if (value == 1) {
		MACIO_BIC(OHARE_FCR, OH_IOBUS_ENABLE);
	} else if (value == 0) {
		MACIO_BIS(OHARE_FCR, OH_IOBUS_ENABLE);
	}

	return 0;
}

static long heathrow_modem_enable(struct device_node *node, long param,
				  long value)
{
	struct macio_chip*	macio;
	u8			gpio;
	unsigned long		flags;

	macio = macio_find(node, macio_unknown);
	if (!macio)
		return -ENODEV;
	gpio = MACIO_IN8(HRW_GPIO_MODEM_RESET) & ~1;
	if (!value) {
		LOCK(flags);
		MACIO_OUT8(HRW_GPIO_MODEM_RESET, gpio);
		UNLOCK(flags);
		(void)MACIO_IN8(HRW_GPIO_MODEM_RESET);
		mdelay(250);
	}
	if (pmac_mb.model_id != PMAC_TYPE_YOSEMITE &&
	    pmac_mb.model_id != PMAC_TYPE_YIKES) {
		LOCK(flags);
		if (value)
			MACIO_BIC(HEATHROW_FCR, HRW_SCC_TRANS_EN_N);
		else
			MACIO_BIS(HEATHROW_FCR, HRW_SCC_TRANS_EN_N);
		UNLOCK(flags);
		(void)MACIO_IN32(HEATHROW_FCR);
		mdelay(250);
	}
	if (value) {
		LOCK(flags);
		MACIO_OUT8(HRW_GPIO_MODEM_RESET, gpio | 1);
		(void)MACIO_IN8(HRW_GPIO_MODEM_RESET);
		UNLOCK(flags); mdelay(250); LOCK(flags);
		MACIO_OUT8(HRW_GPIO_MODEM_RESET, gpio);
		(void)MACIO_IN8(HRW_GPIO_MODEM_RESET);
		UNLOCK(flags); mdelay(250); LOCK(flags);
		MACIO_OUT8(HRW_GPIO_MODEM_RESET, gpio | 1);
		(void)MACIO_IN8(HRW_GPIO_MODEM_RESET);
		UNLOCK(flags); mdelay(250);
	}
	return 0;
}

static long heathrow_floppy_enable(struct device_node *node, long param,
				   long value)
{
	return simple_feature_tweak(node, macio_unknown,
		HEATHROW_FCR,
		HRW_SWIM_ENABLE|HRW_BAY_FLOPPY_ENABLE,
		value);
}

static long heathrow_mesh_enable(struct device_node *node, long param,
				 long value)
{
	struct macio_chip*	macio;
	unsigned long		flags;

	macio = macio_find(node, macio_unknown);
	if (!macio)
		return -ENODEV;
	LOCK(flags);
	/* Set clear mesh cell enable */
	if (value)
		MACIO_BIS(HEATHROW_FCR, HRW_MESH_ENABLE);
	else
		MACIO_BIC(HEATHROW_FCR, HRW_MESH_ENABLE);
	(void)MACIO_IN32(HEATHROW_FCR);
	udelay(10);
	/* Set/Clear termination power */
	if (value)
		MACIO_BIC(HEATHROW_MBCR, 0x04000000);
	else
		MACIO_BIS(HEATHROW_MBCR, 0x04000000);
	(void)MACIO_IN32(HEATHROW_MBCR);
	udelay(10);
	UNLOCK(flags);

	return 0;
}

static long heathrow_ide_enable(struct device_node *node, long param,
				long value)
{
	switch(param) {
	case 0:
		return simple_feature_tweak(node, macio_unknown,
			HEATHROW_FCR, HRW_IDE0_ENABLE, value);
	case 1:
		return simple_feature_tweak(node, macio_unknown,
			HEATHROW_FCR, HRW_BAY_IDE_ENABLE, value);
	default:
		return -ENODEV;
	}
}

static long heathrow_ide_reset(struct device_node *node, long param,
			       long value)
{
	switch(param) {
	case 0:
		return simple_feature_tweak(node, macio_unknown,
			HEATHROW_FCR, HRW_IDE0_RESET_N, !value);
	case 1:
		return simple_feature_tweak(node, macio_unknown,
			HEATHROW_FCR, HRW_IDE1_RESET_N, !value);
	default:
		return -ENODEV;
	}
}

static long heathrow_bmac_enable(struct device_node *node, long param,
				 long value)
{
	struct macio_chip*	macio;
	unsigned long		flags;

	macio = macio_find(node, 0);
	if (!macio)
		return -ENODEV;
	if (value) {
		LOCK(flags);
		MACIO_BIS(HEATHROW_FCR, HRW_BMAC_IO_ENABLE);
		MACIO_BIS(HEATHROW_FCR, HRW_BMAC_RESET);
		UNLOCK(flags);
		(void)MACIO_IN32(HEATHROW_FCR);
		mdelay(10);
		LOCK(flags);
		MACIO_BIC(HEATHROW_FCR, HRW_BMAC_RESET);
		UNLOCK(flags);
		(void)MACIO_IN32(HEATHROW_FCR);
		mdelay(10);
	} else {
		LOCK(flags);
		MACIO_BIC(HEATHROW_FCR, HRW_BMAC_IO_ENABLE);
		UNLOCK(flags);
	}
	return 0;
}

static long heathrow_sound_enable(struct device_node *node, long param,
				  long value)
{
	struct macio_chip*	macio;
	unsigned long		flags;

	/* B&W G3 and Yikes don't support that properly (the
	 * sound appear to never come back after beeing shut down).
	 */
	if (pmac_mb.model_id == PMAC_TYPE_YOSEMITE ||
	    pmac_mb.model_id == PMAC_TYPE_YIKES)
		return 0;

	macio = macio_find(node, 0);
	if (!macio)
		return -ENODEV;
	if (value) {
		LOCK(flags);
		MACIO_BIS(HEATHROW_FCR, HRW_SOUND_CLK_ENABLE);
		MACIO_BIC(HEATHROW_FCR, HRW_SOUND_POWER_N);
		UNLOCK(flags);
		(void)MACIO_IN32(HEATHROW_FCR);
	} else {
		LOCK(flags);
		MACIO_BIS(HEATHROW_FCR, HRW_SOUND_POWER_N);
		MACIO_BIC(HEATHROW_FCR, HRW_SOUND_CLK_ENABLE);
		UNLOCK(flags);
	}
	return 0;
}

static u32 save_fcr[6];
static u32 save_mbcr;
static struct dbdma_regs save_dbdma[13];
static struct dbdma_regs save_alt_dbdma[13];

static void dbdma_save(struct macio_chip *macio, struct dbdma_regs *save)
{