[linux-2.6-block.git] / arch / powerpc / sysdev / cpm_common.c

/*
 * Common CPM code
 *
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * Copyright 2007 Freescale Semiconductor, Inc.
 *
 * Some parts derived from commproc.c/cpm2_common.c, which is:
 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
 * 2006 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <asm/udbg.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/rheap.h>
#include <asm/cpm.h>

#include <mm/mmu_decl.h>

#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
#include <linux/of_gpio.h>
#endif

#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
static u32 __iomem *cpm_udbg_txdesc =
	(u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;

static void udbg_putc_cpm(char c)
{
	u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);

	if (c == '\n')
		udbg_putc_cpm('\r');

	while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
		;

	out_8(txbuf, c);
	out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
}

void __init udbg_init_cpm(void)
{
	if (cpm_udbg_txdesc) {
#ifdef CONFIG_CPM2
		setbat(1, 0xf0000000, 0xf0000000, 1024*1024, PAGE_KERNEL_NCG);
#endif
		udbg_putc = udbg_putc_cpm;
	}
}
#endif

static spinlock_t cpm_muram_lock;
static rh_block_t cpm_boot_muram_rh_block[16];
static rh_info_t cpm_muram_info;
static u8 __iomem *muram_vbase;
static phys_addr_t muram_pbase;

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS	4

int cpm_muram_init(void)
{
	struct device_node *np;
	struct resource r;
	u32 zero[OF_MAX_ADDR_CELLS] = {};
	resource_size_t max = 0;
	int i = 0;
	int ret = 0;

	if (muram_pbase)
		return 0;

	spin_lock_init(&cpm_muram_lock);
	/* initialize the info header */
	rh_init(&cpm_muram_info, 1,
	        sizeof(cpm_boot_muram_rh_block) /
	        sizeof(cpm_boot_muram_rh_block[0]),
	        cpm_boot_muram_rh_block);

	np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
	if (!np) {
		/* try legacy bindings */
		np = of_find_node_by_name(NULL, "data-only");
		if (!np) {
			printk(KERN_ERR "Cannot find CPM muram data node");
			ret = -ENODEV;
			goto out;
		}
	}

	muram_pbase = of_translate_address(np, zero);
	if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
		printk(KERN_ERR "Cannot translate zero through CPM muram node");
		ret = -ENODEV;
		goto out;
	}

	while (of_address_to_resource(np, i++, &r) == 0) {
		if (r.end > max)
			max = r.end;

		rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
		                 r.end - r.start + 1);
	}

	muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
	if (!muram_vbase) {
		printk(KERN_ERR "Cannot map CPM muram");
		ret = -ENOMEM;
	}

out:
	of_node_put(np);
	return ret;
}

/**
 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 * @size: number of bytes to allocate
 * @align: requested alignment, in bytes
 *
 * This function returns an offset into the muram area.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
{
	unsigned long start;
	unsigned long flags;

	spin_lock_irqsave(&cpm_muram_lock, flags);
	cpm_muram_info.alignment = align;
	start = rh_alloc(&cpm_muram_info, size, "commproc");
	spin_unlock_irqrestore(&cpm_muram_lock, flags);

	return start;
}
EXPORT_SYMBOL(cpm_muram_alloc);

/**
 * cpm_muram_free - free a chunk of multi-user ram
 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 */
int cpm_muram_free(unsigned long offset)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&cpm_muram_lock, flags);
	ret = rh_free(&cpm_muram_info, offset);
	spin_unlock_irqrestore(&cpm_muram_lock, flags);

	return ret;
}
EXPORT_SYMBOL(cpm_muram_free);

/**
 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 * @offset: the offset into the muram area to reserve
 * @size: the number of bytes to reserve
 *
 * This function returns "start" on success, -ENOMEM on failure.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
{
	unsigned long start;
	unsigned long flags;

	spin_lock_irqsave(&cpm_muram_lock, flags);
	cpm_muram_info.alignment = 1;
	start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
	spin_unlock_irqrestore(&cpm_muram_lock, flags);

	return start;
}
EXPORT_SYMBOL(cpm_muram_alloc_fixed);

/**
 * cpm_muram_addr - turn a muram offset into a virtual address
 * @offset: muram offset to convert
 */
void __iomem *cpm_muram_addr(unsigned long offset)
{
	return muram_vbase + offset;
}
EXPORT_SYMBOL(cpm_muram_addr);

unsigned long cpm_muram_offset(void __iomem *addr)
{
	return addr - (void __iomem *)muram_vbase;
}
EXPORT_SYMBOL(cpm_muram_offset);

/**
 * cpm_muram_dma - turn a muram virtual address into a DMA address
 * @offset: virtual address from cpm_muram_addr() to convert
 */
dma_addr_t cpm_muram_dma(void __iomem *addr)
{
	return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
}
EXPORT_SYMBOL(cpm_muram_dma);

#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)

struct cpm2_ioports {
	u32 dir, par, sor, odr, dat;
	u32 res[3];
};

struct cpm2_gpio32_chip {
	struct of_mm_gpio_chip mm_gc;
	spinlock_t lock;

	/* shadowed data register to clear/set bits safely */
	u32 cpdata;
};

static inline struct cpm2_gpio32_chip *
to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
{
	return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
}

static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
{
	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	struct cpm2_ioports __iomem *iop = mm_gc->regs;

	cpm2_gc->cpdata = in_be32(&iop->dat);
}

static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct cpm2_ioports __iomem *iop = mm_gc->regs;
	u32 pin_mask;

	pin_mask = 1 << (31 - gpio);

	return !!(in_be32(&iop->dat) & pin_mask);
}

static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
	int value)
{
	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	struct cpm2_ioports __iomem *iop = mm_gc->regs;

	if (value)
		cpm2_gc->cpdata |= pin_mask;
	else
		cpm2_gc->cpdata &= ~pin_mask;

	out_be32(&iop->dat, cpm2_gc->cpdata);
}

static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	unsigned long flags;
	u32 pin_mask = 1 << (31 - gpio);

	spin_lock_irqsave(&cpm2_gc->lock, flags);

	__cpm2_gpio32_set(mm_gc, pin_mask, value);

	spin_unlock_irqrestore(&cpm2_gc->lock, flags);
}

static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	struct cpm2_ioports __iomem *iop = mm_gc->regs;
	unsigned long flags;
	u32 pin_mask = 1 << (31 - gpio);

	spin_lock_irqsave(&cpm2_gc->lock, flags);

	setbits32(&iop->dir, pin_mask);
	__cpm2_gpio32_set(mm_gc, pin_mask, val);

	spin_unlock_irqrestore(&cpm2_gc->lock, flags);

	return 0;
}

static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	struct cpm2_ioports __iomem *iop = mm_gc->regs;
	unsigned long flags;
	u32 pin_mask = 1 << (31 - gpio);

	spin_lock_irqsave(&cpm2_gc->lock, flags);

	clrbits32(&iop->dir, pin_mask);

	spin_unlock_irqrestore(&cpm2_gc->lock, flags);

	return 0;
}

int cpm2_gpiochip_add32(struct device_node *np)
{
	struct cpm2_gpio32_chip *cpm2_gc;
	struct of_mm_gpio_chip *mm_gc;
	struct of_gpio_chip *of_gc;
	struct gpio_chip *gc;

	cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
	if (!cpm2_gc)
		return -ENOMEM;

	spin_lock_init(&cpm2_gc->lock);

	mm_gc = &cpm2_gc->mm_gc;
	of_gc = &mm_gc->of_gc;
	gc = &of_gc->gc;

	mm_gc->save_regs = cpm2_gpio32_save_regs;
	of_gc->gpio_cells = 2;
	gc->ngpio = 32;
	gc->direction_input = cpm2_gpio32_dir_in;
	gc->direction_output = cpm2_gpio32_dir_out;
	gc->get = cpm2_gpio32_get;
	gc->set = cpm2_gpio32_set;

	return of_mm_gpiochip_add(np, mm_gc);
}
#endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */
Commit	Line	Data
c374e00e SW	1	/*
	2	* Common CPM code
	3	*
	4	* Author: Scott Wood <scottwood@freescale.com>
	5	*
	6	* Copyright 2007 Freescale Semiconductor, Inc.
	7	*
15f8c604 SW	8	* Some parts derived from commproc.c/cpm2_common.c, which is:
	9	* Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
	10	* Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
	11	* Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
	12	* 2006 (c) MontaVista Software, Inc.
	13	* Vitaly Bordug <vbordug@ru.mvista.com>
	14	*
c374e00e SW	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of version 2 of the GNU General Public License as
	17	* published by the Free Software Foundation.
	18	*/
	19
	20	#include <linux/init.h>
15f8c604	21	#include <linux/of_device.h>
e193325e LP	22	#include <linux/spinlock.h>
e193325e LP	23	#include <linux/of.h>
5a0e3ad6	24	#include <linux/slab.h>
15f8c604	25
c374e00e SW	26	#include <asm/udbg.h>
	27	#include <asm/io.h>
	28	#include <asm/system.h>
15f8c604 SW	29	#include <asm/rheap.h>
	30	#include <asm/cpm.h>
	31
c374e00e SW	32	#include <mm/mmu_decl.h>
c374e00e SW	33
e193325e LP	34	#if defined(CONFIG_CPM2) \|\| defined(CONFIG_8xx_GPIO)
	35	#include <linux/of_gpio.h>
	36	#endif
	37
c374e00e SW	38	#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
	39	static u32 __iomem *cpm_udbg_txdesc =
	40	(u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
	41
	42	static void udbg_putc_cpm(char c)
	43	{
	44	u8 __iomem txbuf = (u8 __iomem __force )in_be32(&cpm_udbg_txdesc[1]);
	45
	46	if (c == '\n')
5e82eb33	47	udbg_putc_cpm('\r');
c374e00e SW	48
	49	while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
	50	;
	51
	52	out_8(txbuf, c);
	53	out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
	54	}
	55
	56	void __init udbg_init_cpm(void)
	57	{
	58	if (cpm_udbg_txdesc) {
	59	#ifdef CONFIG_CPM2
8d1cf34e	60	setbat(1, 0xf0000000, 0xf0000000, 1024*1024, PAGE_KERNEL_NCG);
c374e00e SW	61	#endif
	62	udbg_putc = udbg_putc_cpm;
	63	}
	64	}
	65	#endif
15f8c604	66
15f8c604 SW	67	static spinlock_t cpm_muram_lock;
	68	static rh_block_t cpm_boot_muram_rh_block[16];
	69	static rh_info_t cpm_muram_info;
	70	static u8 __iomem *muram_vbase;
	71	static phys_addr_t muram_pbase;
	72
	73	/* Max address size we deal with */
	74	#define OF_MAX_ADDR_CELLS 4
	75
0c7b87b0	76	int cpm_muram_init(void)
15f8c604 SW	77	{
	78	struct device_node *np;
	79	struct resource r;
	80	u32 zero[OF_MAX_ADDR_CELLS] = {};
	81	resource_size_t max = 0;
	82	int i = 0;
	83	int ret = 0;
	84
0c7b87b0 AV	85	if (muram_pbase)
	86	return 0;
	87
15f8c604 SW	88	spin_lock_init(&cpm_muram_lock);
	89	/* initialize the info header */
	90	rh_init(&cpm_muram_info, 1,
	91	sizeof(cpm_boot_muram_rh_block) /
	92	sizeof(cpm_boot_muram_rh_block[0]),
	93	cpm_boot_muram_rh_block);
	94
	95	np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
	96	if (!np) {
5093bb96 AV	97	/* try legacy bindings */
	98	np = of_find_node_by_name(NULL, "data-only");
	99	if (!np) {
	100	printk(KERN_ERR "Cannot find CPM muram data node");
	101	ret = -ENODEV;
	102	goto out;
	103	}
15f8c604 SW	104	}
	105
	106	muram_pbase = of_translate_address(np, zero);
	107	if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
	108	printk(KERN_ERR "Cannot translate zero through CPM muram node");
	109	ret = -ENODEV;
	110	goto out;
	111	}
	112
	113	while (of_address_to_resource(np, i++, &r) == 0) {
	114	if (r.end > max)
	115	max = r.end;
	116
	117	rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
	118	r.end - r.start + 1);
	119	}
	120
	121	muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
	122	if (!muram_vbase) {
	123	printk(KERN_ERR "Cannot map CPM muram");
	124	ret = -ENOMEM;
	125	}
	126
	127	out:
	128	of_node_put(np);
	129	return ret;
	130	}
	131
	132	/**
	133	* cpm_muram_alloc - allocate the requested size worth of multi-user ram
	134	* @size: number of bytes to allocate
	135	* @align: requested alignment, in bytes
	136	*
	137	* This function returns an offset into the muram area.
	138	* Use cpm_dpram_addr() to get the virtual address of the area.
	139	* Use cpm_muram_free() to free the allocation.
	140	*/
	141	unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
	142	{
	143	unsigned long start;
	144	unsigned long flags;
	145
	146	spin_lock_irqsave(&cpm_muram_lock, flags);
	147	cpm_muram_info.alignment = align;
	148	start = rh_alloc(&cpm_muram_info, size, "commproc");
	149	spin_unlock_irqrestore(&cpm_muram_lock, flags);
	150
	151	return start;
	152	}
	153	EXPORT_SYMBOL(cpm_muram_alloc);
	154
	155	/**
	156	* cpm_muram_free - free a chunk of multi-user ram
	157	* @offset: The beginning of the chunk as returned by cpm_muram_alloc().
	158	*/
	159	int cpm_muram_free(unsigned long offset)
	160	{
	161	int ret;
	162	unsigned long flags;
	163
	164	spin_lock_irqsave(&cpm_muram_lock, flags);
	165	ret = rh_free(&cpm_muram_info, offset);
	166	spin_unlock_irqrestore(&cpm_muram_lock, flags);
	167
168	return ret;
169	}
170	EXPORT_SYMBOL(cpm_muram_free);
171
172	/**
173	* cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
174	* @offset: the offset into the muram area to reserve
175	* @size: the number of bytes to reserve
176	*
177	* This function returns "start" on success, -ENOMEM on failure.
178	* Use cpm_dpram_addr() to get the virtual address of the area.
179	* Use cpm_muram_free() to free the allocation.
180	*/
181	unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
182	{
183	unsigned long start;
184	unsigned long flags;
185
186	spin_lock_irqsave(&cpm_muram_lock, flags);
187	cpm_muram_info.alignment = 1;
188	start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
189	spin_unlock_irqrestore(&cpm_muram_lock, flags);
190
191	return start;
192	}
193	EXPORT_SYMBOL(cpm_muram_alloc_fixed);
194
195	/**
196	* cpm_muram_addr - turn a muram offset into a virtual address
197	* @offset: muram offset to convert
198	*/
199	void __iomem *cpm_muram_addr(unsigned long offset)
200	{
201	return muram_vbase + offset;
202	}
203	EXPORT_SYMBOL(cpm_muram_addr);
204
5093bb96 AV	205	unsigned long cpm_muram_offset(void __iomem *addr)
	206	{
	207	return addr - (void __iomem *)muram_vbase;
	208	}
	209	EXPORT_SYMBOL(cpm_muram_offset);
	210
15f8c604	211	/**
4c011b1f	212	* cpm_muram_dma - turn a muram virtual address into a DMA address
15f8c604 SW	213	* @offset: virtual address from cpm_muram_addr() to convert
	214	*/
	215	dma_addr_t cpm_muram_dma(void __iomem *addr)
	216	{
	217	return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
	218	}
	219	EXPORT_SYMBOL(cpm_muram_dma);
e193325e LP	220
	221	#if defined(CONFIG_CPM2) \|\| defined(CONFIG_8xx_GPIO)
	222
	223	struct cpm2_ioports {
	224	u32 dir, par, sor, odr, dat;
	225	u32 res[3];
	226	};
	227
	228	struct cpm2_gpio32_chip {
	229	struct of_mm_gpio_chip mm_gc;
	230	spinlock_t lock;
	231
	232	/* shadowed data register to clear/set bits safely */
	233	u32 cpdata;
	234	};
	235
	236	static inline struct cpm2_gpio32_chip *
	237	to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
	238	{
	239	return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
	240	}
	241
	242	static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
	243	{
	244	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	245	struct cpm2_ioports __iomem *iop = mm_gc->regs;
	246
	247	cpm2_gc->cpdata = in_be32(&iop->dat);
	248	}
	249
	250	static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
	251	{
	252	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	253	struct cpm2_ioports __iomem *iop = mm_gc->regs;
	254	u32 pin_mask;
	255
	256	pin_mask = 1 << (31 - gpio);
	257
	258	return !!(in_be32(&iop->dat) & pin_mask);
	259	}
	260
639d6445 LP	261	static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
639d6445 LP	262	int value)
e193325e	263	{
e193325e LP	264	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
e193325e LP	265	struct cpm2_ioports __iomem *iop = mm_gc->regs;
e193325e LP	266
	267	if (value)
	268	cpm2_gc->cpdata \|= pin_mask;
	269	else
	270	cpm2_gc->cpdata &= ~pin_mask;
	271
	272	out_be32(&iop->dat, cpm2_gc->cpdata);
639d6445 LP	273	}
	274
	275	static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
	276	{
	277	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	278	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
	279	unsigned long flags;
	280	u32 pin_mask = 1 << (31 - gpio);
	281
	282	spin_lock_irqsave(&cpm2_gc->lock, flags);
	283
	284	__cpm2_gpio32_set(mm_gc, pin_mask, value);
e193325e LP	285
	286	spin_unlock_irqrestore(&cpm2_gc->lock, flags);
	287	}
	288
	289	static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	290	{
	291	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
639d6445	292	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
e193325e	293	struct cpm2_ioports __iomem *iop = mm_gc->regs;
639d6445 LP	294	unsigned long flags;
639d6445 LP	295	u32 pin_mask = 1 << (31 - gpio);
e193325e	296
639d6445	297	spin_lock_irqsave(&cpm2_gc->lock, flags);
e193325e LP	298
e193325e LP	299	setbits32(&iop->dir, pin_mask);
639d6445	300	__cpm2_gpio32_set(mm_gc, pin_mask, val);
e193325e	301
639d6445	302	spin_unlock_irqrestore(&cpm2_gc->lock, flags);
e193325e LP	303
	304	return 0;
	305	}
	306
	307	static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
	308	{
	309	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
639d6445	310	struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
e193325e	311	struct cpm2_ioports __iomem *iop = mm_gc->regs;
639d6445 LP	312	unsigned long flags;
639d6445 LP	313	u32 pin_mask = 1 << (31 - gpio);
e193325e	314
639d6445	315	spin_lock_irqsave(&cpm2_gc->lock, flags);
e193325e LP	316
	317	clrbits32(&iop->dir, pin_mask);
	318
639d6445 LP	319	spin_unlock_irqrestore(&cpm2_gc->lock, flags);
639d6445 LP	320
e193325e LP	321	return 0;
	322	}
	323
	324	int cpm2_gpiochip_add32(struct device_node *np)
	325	{
	326	struct cpm2_gpio32_chip *cpm2_gc;
	327	struct of_mm_gpio_chip *mm_gc;
	328	struct of_gpio_chip *of_gc;
	329	struct gpio_chip *gc;
	330
	331	cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
	332	if (!cpm2_gc)
	333	return -ENOMEM;
	334
	335	spin_lock_init(&cpm2_gc->lock);
	336
	337	mm_gc = &cpm2_gc->mm_gc;
	338	of_gc = &mm_gc->of_gc;
	339	gc = &of_gc->gc;
	340
	341	mm_gc->save_regs = cpm2_gpio32_save_regs;
	342	of_gc->gpio_cells = 2;
	343	gc->ngpio = 32;
	344	gc->direction_input = cpm2_gpio32_dir_in;
	345	gc->direction_output = cpm2_gpio32_dir_out;
	346	gc->get = cpm2_gpio32_get;
	347	gc->set = cpm2_gpio32_set;
	348
	349	return of_mm_gpiochip_add(np, mm_gc);
	350	}
	351	#endif /* CONFIG_CPM2 \|\| CONFIG_8xx_GPIO */