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i2c-hydra.c

/*
    i2c-hydra.c - Part of lm_sensors,  Linux kernel modules
                  for hardware monitoring

    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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#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/init.h>
#include <asm/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",
      .id         = I2C_HW_B_HYDRA,
      .algo_data  = &hydra_bit_data,
};

static 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 __devinit 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 = ioremap(base, pci_resource_len(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 __devexit 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           = __devexit_p(hydra_remove),
};

static int __init i2c_hydra_init(void)
{
      return pci_register_driver(&hydra_driver);
}


static void __exit i2c_hydra_exit(void)
{
      pci_unregister_driver(&hydra_driver);
}



MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
MODULE_LICENSE("GPL");

module_init(i2c_hydra_init);
module_exit(i2c_hydra_exit);


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