[linux-2.6-block.git] / arch / mips / pci / ops-fuloong2e.c

/*
 * fuloong2e specific PCI support.
 *
 * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
 *	All rights reserved.
 *	Authors: Carsten Langgaard <carstenl@mips.com>
 *		 Maciej W. Rozycki <macro@mips.com>
 *
 * Copyright (C) 2009 Lemote Inc.
 * Author: Wu Zhangjin <wuzj@lemote.com>
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 */
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <loongson.h>

#define PCI_ACCESS_READ  0
#define PCI_ACCESS_WRITE 1

#define CFG_SPACE_REG(offset) \
	(void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE | (offset))
#define ID_SEL_BEGIN 11
#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)


static int loongson_pcibios_config_access(unsigned char access_type,
				      struct pci_bus *bus,
				      unsigned int devfn, int where,
				      u32 *data)
{
	u32 busnum = bus->number;
	u32 addr, type;
	u32 dummy;
	void *addrp;
	int device = PCI_SLOT(devfn);
	int function = PCI_FUNC(devfn);
	int reg = where & ~3;

	if (busnum == 0) {
		/* Type 0 configuration for onboard PCI bus */
		if (device > MAX_DEV_NUM)
			return -1;

		addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
		type = 0;
	} else {
		/* Type 1 configuration for offboard PCI bus */
		addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
		type = 0x10000;
	}

	/* Clear aborts */
	LOONGSON_PCICMD |= LOONGSON_PCICMD_MABORT_CLR | \
				LOONGSON_PCICMD_MTABORT_CLR;

	LOONGSON_PCIMAP_CFG = (addr >> 16) | type;

	/* Flush Bonito register block */
	dummy = LOONGSON_PCIMAP_CFG;
	mmiowb();

	addrp = CFG_SPACE_REG(addr & 0xffff);
	if (access_type == PCI_ACCESS_WRITE)
		writel(cpu_to_le32(*data), addrp);
	else
		*data = le32_to_cpu(readl(addrp));

	/* Detect Master/Target abort */
	if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR |
			     LOONGSON_PCICMD_MTABORT_CLR)) {
		/* Error occurred */

		/* Clear bits */
		LOONGSON_PCICMD |= (LOONGSON_PCICMD_MABORT_CLR |
				  LOONGSON_PCICMD_MTABORT_CLR);

		return -1;
	}

	return 0;

}


/*
 * We can't address 8 and 16 bit words directly.  Instead we have to
 * read/write a 32bit word and mask/modify the data we actually want.
 */
static int loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
			     int where, int size, u32 *val)
{
	u32 data = 0;

	if ((size == 2) && (where & 1))
		return PCIBIOS_BAD_REGISTER_NUMBER;
	else if ((size == 4) && (where & 3))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
				       &data))
		return -1;

	if (size == 1)
		*val = (data >> ((where & 3) << 3)) & 0xff;
	else if (size == 2)
		*val = (data >> ((where & 3) << 3)) & 0xffff;
	else
		*val = data;

	return PCIBIOS_SUCCESSFUL;
}

static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
			      int where, int size, u32 val)
{
	u32 data = 0;

	if ((size == 2) && (where & 1))
		return PCIBIOS_BAD_REGISTER_NUMBER;
	else if ((size == 4) && (where & 3))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	if (size == 4)
		data = val;
	else {
		if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
					where, &data))
			return -1;

		if (size == 1)
			data = (data & ~(0xff << ((where & 3) << 3))) |
				(val << ((where & 3) << 3));
		else if (size == 2)
			data = (data & ~(0xffff << ((where & 3) << 3))) |
				(val << ((where & 3) << 3));
	}

	if (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
				       &data))
		return -1;

	return PCIBIOS_SUCCESSFUL;
}

struct pci_ops loongson_pci_ops = {
	.read = loongson_pcibios_read,
	.write = loongson_pcibios_write
};
Commit	Line	Data
e2fee572 WZ	1	/*
	2	* fuloong2e specific PCI support.
	3	*
	4	* Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
	5	* All rights reserved.
	6	* Authors: Carsten Langgaard <carstenl@mips.com>
	7	* Maciej W. Rozycki <macro@mips.com>
	8	*
	9	* Copyright (C) 2009 Lemote Inc.
	10	* Author: Wu Zhangjin <wuzj@lemote.com>
	11	*
	12	* This program is free software; you can distribute it and/or modify it
	13	* under the terms of the GNU General Public License (Version 2) as
	14	* published by the Free Software Foundation.
	15	*/
	16	#include <linux/types.h>
	17	#include <linux/pci.h>
	18	#include <linux/kernel.h>
	19	#include <linux/init.h>
	20
	21	#include <loongson.h>
	22
	23	#define PCI_ACCESS_READ 0
	24	#define PCI_ACCESS_WRITE 1
	25
	26	#define CFG_SPACE_REG(offset) \
	27	(void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE \| (offset))
	28	#define ID_SEL_BEGIN 11
	29	#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
	30
	31
	32	static int loongson_pcibios_config_access(unsigned char access_type,
	33	struct pci_bus *bus,
	34	unsigned int devfn, int where,
	35	u32 *data)
	36	{
	37	u32 busnum = bus->number;
	38	u32 addr, type;
	39	u32 dummy;
	40	void *addrp;
	41	int device = PCI_SLOT(devfn);
	42	int function = PCI_FUNC(devfn);
	43	int reg = where & ~3;
	44
	45	if (busnum == 0) {
	46	/* Type 0 configuration for onboard PCI bus */
	47	if (device > MAX_DEV_NUM)
	48	return -1;
	49
	50	addr = (1 << (device + ID_SEL_BEGIN)) \| (function << 8) \| reg;
	51	type = 0;
	52	} else {
	53	/* Type 1 configuration for offboard PCI bus */
	54	addr = (busnum << 16) \| (device << 11) \| (function << 8) \| reg;
	55	type = 0x10000;
	56	}
	57
	58	/* Clear aborts */
	59	LOONGSON_PCICMD \|= LOONGSON_PCICMD_MABORT_CLR \| \
	60	LOONGSON_PCICMD_MTABORT_CLR;
	61
	62	LOONGSON_PCIMAP_CFG = (addr >> 16) \| type;
	63
	64	/* Flush Bonito register block */
65	dummy = LOONGSON_PCIMAP_CFG;
66	mmiowb();
67
68	addrp = CFG_SPACE_REG(addr & 0xffff);
69	if (access_type == PCI_ACCESS_WRITE)
70	writel(cpu_to_le32(*data), addrp);
71	else
72	*data = le32_to_cpu(readl(addrp));
73
74	/* Detect Master/Target abort */
75	if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR \|
76	LOONGSON_PCICMD_MTABORT_CLR)) {
77	/* Error occurred */
78
79	/* Clear bits */
80	LOONGSON_PCICMD \|= (LOONGSON_PCICMD_MABORT_CLR \|
81	LOONGSON_PCICMD_MTABORT_CLR);
82
83	return -1;
84	}
85
86	return 0;
87
88	}
89
90
91	/*
92	* We can't address 8 and 16 bit words directly. Instead we have to
93	* read/write a 32bit word and mask/modify the data we actually want.
94	*/
95	static int loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
96	int where, int size, u32 *val)
97	{
98	u32 data = 0;
99
100	if ((size == 2) && (where & 1))
101	return PCIBIOS_BAD_REGISTER_NUMBER;
102	else if ((size == 4) && (where & 3))
103	return PCIBIOS_BAD_REGISTER_NUMBER;
104
105	if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
106	&data))
107	return -1;
108
109	if (size == 1)
110	*val = (data >> ((where & 3) << 3)) & 0xff;
111	else if (size == 2)
112	*val = (data >> ((where & 3) << 3)) & 0xffff;
113	else
114	*val = data;
115
116	return PCIBIOS_SUCCESSFUL;
117	}
118
119	static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
120	int where, int size, u32 val)
121	{
122	u32 data = 0;
123
124	if ((size == 2) && (where & 1))
125	return PCIBIOS_BAD_REGISTER_NUMBER;
126	else if ((size == 4) && (where & 3))
127	return PCIBIOS_BAD_REGISTER_NUMBER;
128
129	if (size == 4)
130	data = val;
131	else {
132	if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
133	where, &data))
134	return -1;
135
136	if (size == 1)
137	data = (data & ~(0xff << ((where & 3) << 3))) \|
138	(val << ((where & 3) << 3));
139	else if (size == 2)
140	data = (data & ~(0xffff << ((where & 3) << 3))) \|
141	(val << ((where & 3) << 3));
142	}
143
144	if (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
145	&data))
146	return -1;
147
148	return PCIBIOS_SUCCESSFUL;
149	}
150
151	struct pci_ops loongson_pci_ops = {
152	.read = loongson_pcibios_read,
153	.write = loongson_pcibios_write
154	};