[mirror_ubuntu-zesty-kernel.git] / drivers / i2c / busses / i2c-hydra.c

/*
    i2c Support for the Apple `Hydra' Mac I/O

    Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org>

    Based on i2c Support for Via Technologies 82C586B South Bridge
    Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>

    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.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>
#include <asm/hydra.h>


#define HYDRA_CPD_PD0	0x00000001	/* CachePD lines */
#define HYDRA_CPD_PD1	0x00000002
#define HYDRA_CPD_PD2	0x00000004
#define HYDRA_CPD_PD3	0x00000008

#define HYDRA_SCLK	HYDRA_CPD_PD0
#define HYDRA_SDAT	HYDRA_CPD_PD1
#define HYDRA_SCLK_OE	0x00000010
#define HYDRA_SDAT_OE	0x00000020

static inline void pdregw(void *data, u32 val)
{
	struct Hydra *hydra = (struct Hydra *)data;
	writel(val, &hydra->CachePD);
}

static inline u32 pdregr(void *data)
{
	struct Hydra *hydra = (struct Hydra *)data;
	return readl(&hydra->CachePD);
}

static void hydra_bit_setscl(void *data, int state)
{
	u32 val = pdregr(data);
	if (state)
		val &= ~HYDRA_SCLK_OE;
	else {
		val &= ~HYDRA_SCLK;
		val |= HYDRA_SCLK_OE;
	}
	pdregw(data, val);
}

static void hydra_bit_setsda(void *data, int state)
{
	u32 val = pdregr(data);
	if (state)
		val &= ~HYDRA_SDAT_OE;
	else {
		val &= ~HYDRA_SDAT;
		val |= HYDRA_SDAT_OE;
	}
	pdregw(data, val);
}

static int hydra_bit_getscl(void *data)
{
	return (pdregr(data) & HYDRA_SCLK) != 0;
}

static int hydra_bit_getsda(void *data)
{
	return (pdregr(data) & HYDRA_SDAT) != 0;
}

/* ------------------------------------------------------------------------ */

static struct i2c_algo_bit_data hydra_bit_data = {
	.setsda		= hydra_bit_setsda,
	.setscl		= hydra_bit_setscl,
	.getsda		= hydra_bit_getsda,
	.getscl		= hydra_bit_getscl,
	.udelay		= 5,
	.timeout	= HZ
};

static struct i2c_adapter hydra_adap = {
	.owner		= THIS_MODULE,
	.name		= "Hydra i2c",
	.algo_data	= &hydra_bit_data,
};

static const struct pci_device_id hydra_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
	{ 0, }
};

MODULE_DEVICE_TABLE (pci, hydra_ids);

static int hydra_probe(struct pci_dev *dev,
				 const struct pci_device_id *id)
{
	unsigned long base = pci_resource_start(dev, 0);
	int res;

	if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
				hydra_adap.name))
		return -EBUSY;

	hydra_bit_data.data = pci_ioremap_bar(dev, 0);
	if (hydra_bit_data.data == NULL) {
		release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
		return -ENODEV;
	}

	pdregw(hydra_bit_data.data, 0);		/* clear SCLK_OE and SDAT_OE */
	hydra_adap.dev.parent = &dev->dev;
	res = i2c_bit_add_bus(&hydra_adap);
	if (res < 0) {
		iounmap(hydra_bit_data.data);
		release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
		return res;
	}
	return 0;
}

static void hydra_remove(struct pci_dev *dev)
{
	pdregw(hydra_bit_data.data, 0);		/* clear SCLK_OE and SDAT_OE */
	i2c_del_adapter(&hydra_adap);
	iounmap(hydra_bit_data.data);
	release_mem_region(pci_resource_start(dev, 0)+
			   offsetof(struct Hydra, CachePD), 4);
}


static struct pci_driver hydra_driver = {
	.name		= "hydra_smbus",
	.id_table	= hydra_ids,
	.probe		= hydra_probe,
	.remove		= hydra_remove,
};

module_pci_driver(hydra_driver);

MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	i2c Support for the Apple `Hydra' Mac I/O
	3
	4	Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org>
	5
	6	Based on i2c Support for Via Technologies 82C586B South Bridge
96de0e25	7	Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
1da177e4 LT	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
1da177e4 LT	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/pci.h>
	23	#include <linux/types.h>
	24	#include <linux/i2c.h>
	25	#include <linux/i2c-algo-bit.h>
21782180	26	#include <linux/io.h>
1da177e4 LT	27	#include <asm/hydra.h>
	28
	29
	30	#define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */
	31	#define HYDRA_CPD_PD1 0x00000002
	32	#define HYDRA_CPD_PD2 0x00000004
	33	#define HYDRA_CPD_PD3 0x00000008
	34
	35	#define HYDRA_SCLK HYDRA_CPD_PD0
	36	#define HYDRA_SDAT HYDRA_CPD_PD1
	37	#define HYDRA_SCLK_OE 0x00000010
	38	#define HYDRA_SDAT_OE 0x00000020
	39
	40	static inline void pdregw(void *data, u32 val)
	41	{
	42	struct Hydra hydra = (struct Hydra )data;
	43	writel(val, &hydra->CachePD);
	44	}
	45
	46	static inline u32 pdregr(void *data)
	47	{
	48	struct Hydra hydra = (struct Hydra )data;
	49	return readl(&hydra->CachePD);
	50	}
	51
	52	static void hydra_bit_setscl(void *data, int state)
	53	{
	54	u32 val = pdregr(data);
	55	if (state)
	56	val &= ~HYDRA_SCLK_OE;
	57	else {
	58	val &= ~HYDRA_SCLK;
	59	val \|= HYDRA_SCLK_OE;
	60	}
	61	pdregw(data, val);
	62	}
	63
	64	static void hydra_bit_setsda(void *data, int state)
	65	{
	66	u32 val = pdregr(data);
	67	if (state)
	68	val &= ~HYDRA_SDAT_OE;
	69	else {
	70	val &= ~HYDRA_SDAT;
	71	val \|= HYDRA_SDAT_OE;
	72	}
	73	pdregw(data, val);
	74	}
	75
	76	static int hydra_bit_getscl(void *data)
	77	{
	78	return (pdregr(data) & HYDRA_SCLK) != 0;
	79	}
	80
	81	static int hydra_bit_getsda(void *data)
	82	{
	83	return (pdregr(data) & HYDRA_SDAT) != 0;
	84	}
	85
	86	/* ------------------------------------------------------------------------ */
	87
	88	static struct i2c_algo_bit_data hydra_bit_data = {
	89	.setsda = hydra_bit_setsda,
	90	.setscl = hydra_bit_setscl,
91	.getsda = hydra_bit_getsda,
92	.getscl = hydra_bit_getscl,
93	.udelay = 5,
1da177e4 LT	94	.timeout = HZ
	95	};
	96
	97	static struct i2c_adapter hydra_adap = {
	98	.owner = THIS_MODULE,
	99	.name = "Hydra i2c",
1da177e4 LT	100	.algo_data = &hydra_bit_data,
	101	};
	102
392debf1	103	static const struct pci_device_id hydra_ids[] = {
1da177e4 LT	104	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
	105	{ 0, }
	106	};
	107
	108	MODULE_DEVICE_TABLE (pci, hydra_ids);
	109
0b255e92	110	static int hydra_probe(struct pci_dev *dev,
1da177e4 LT	111	const struct pci_device_id *id)
	112	{
	113	unsigned long base = pci_resource_start(dev, 0);
	114	int res;
	115
	116	if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
	117	hydra_adap.name))
	118	return -EBUSY;
	119
c7a5f22d	120	hydra_bit_data.data = pci_ioremap_bar(dev, 0);
1da177e4 LT	121	if (hydra_bit_data.data == NULL) {
	122	release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
	123	return -ENODEV;
	124	}
	125
	126	pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
	127	hydra_adap.dev.parent = &dev->dev;
	128	res = i2c_bit_add_bus(&hydra_adap);
	129	if (res < 0) {
	130	iounmap(hydra_bit_data.data);
	131	release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
	132	return res;
	133	}
	134	return 0;
	135	}
	136
0b255e92	137	static void hydra_remove(struct pci_dev *dev)
1da177e4 LT	138	{
1da177e4 LT	139	pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
3269711b	140	i2c_del_adapter(&hydra_adap);
1da177e4 LT	141	iounmap(hydra_bit_data.data);
	142	release_mem_region(pci_resource_start(dev, 0)+
	143	offsetof(struct Hydra, CachePD), 4);
	144	}
	145
	146
	147	static struct pci_driver hydra_driver = {
	148	.name = "hydra_smbus",
	149	.id_table = hydra_ids,
	150	.probe = hydra_probe,
0b255e92	151	.remove = hydra_remove,
1da177e4 LT	152	};
1da177e4 LT	153
56f21788	154	module_pci_driver(hydra_driver);
1da177e4 LT	155
	156	MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
	157	MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
	158	MODULE_LICENSE("GPL");