159 lines
3.8 KiB
C
159 lines
3.8 KiB
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");
|