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Linux/drivers/i2c/busses/i2c-hydra.c

  1 /*
  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
  7     Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
  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.
 18 
 19     You should have received a copy of the GNU General Public License
 20     along with this program; if not, write to the Free Software
 21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 22 */
 23 
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/pci.h>
 27 #include <linux/types.h>
 28 #include <linux/i2c.h>
 29 #include <linux/i2c-algo-bit.h>
 30 #include <linux/io.h>
 31 #include <asm/hydra.h>
 32 
 33 
 34 #define HYDRA_CPD_PD0   0x00000001      /* CachePD lines */
 35 #define HYDRA_CPD_PD1   0x00000002
 36 #define HYDRA_CPD_PD2   0x00000004
 37 #define HYDRA_CPD_PD3   0x00000008
 38 
 39 #define HYDRA_SCLK      HYDRA_CPD_PD0
 40 #define HYDRA_SDAT      HYDRA_CPD_PD1
 41 #define HYDRA_SCLK_OE   0x00000010
 42 #define HYDRA_SDAT_OE   0x00000020
 43 
 44 static inline void pdregw(void *data, u32 val)
 45 {
 46         struct Hydra *hydra = (struct Hydra *)data;
 47         writel(val, &hydra->CachePD);
 48 }
 49 
 50 static inline u32 pdregr(void *data)
 51 {
 52         struct Hydra *hydra = (struct Hydra *)data;
 53         return readl(&hydra->CachePD);
 54 }
 55 
 56 static void hydra_bit_setscl(void *data, int state)
 57 {
 58         u32 val = pdregr(data);
 59         if (state)
 60                 val &= ~HYDRA_SCLK_OE;
 61         else {
 62                 val &= ~HYDRA_SCLK;
 63                 val |= HYDRA_SCLK_OE;
 64         }
 65         pdregw(data, val);
 66 }
 67 
 68 static void hydra_bit_setsda(void *data, int state)
 69 {
 70         u32 val = pdregr(data);
 71         if (state)
 72                 val &= ~HYDRA_SDAT_OE;
 73         else {
 74                 val &= ~HYDRA_SDAT;
 75                 val |= HYDRA_SDAT_OE;
 76         }
 77         pdregw(data, val);
 78 }
 79 
 80 static int hydra_bit_getscl(void *data)
 81 {
 82         return (pdregr(data) & HYDRA_SCLK) != 0;
 83 }
 84 
 85 static int hydra_bit_getsda(void *data)
 86 {
 87         return (pdregr(data) & HYDRA_SDAT) != 0;
 88 }
 89 
 90 /* ------------------------------------------------------------------------ */
 91 
 92 static struct i2c_algo_bit_data hydra_bit_data = {
 93         .setsda         = hydra_bit_setsda,
 94         .setscl         = hydra_bit_setscl,
 95         .getsda         = hydra_bit_getsda,
 96         .getscl         = hydra_bit_getscl,
 97         .udelay         = 5,
 98         .timeout        = HZ
 99 };
100 
101 static struct i2c_adapter hydra_adap = {
102         .owner          = THIS_MODULE,
103         .name           = "Hydra i2c",
104         .algo_data      = &hydra_bit_data,
105 };
106 
107 static const struct pci_device_id hydra_ids[] = {
108         { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
109         { 0, }
110 };
111 
112 MODULE_DEVICE_TABLE (pci, hydra_ids);
113 
114 static int hydra_probe(struct pci_dev *dev,
115                                  const struct pci_device_id *id)
116 {
117         unsigned long base = pci_resource_start(dev, 0);
118         int res;
119 
120         if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
121                                 hydra_adap.name))
122                 return -EBUSY;
123 
124         hydra_bit_data.data = pci_ioremap_bar(dev, 0);
125         if (hydra_bit_data.data == NULL) {
126                 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
127                 return -ENODEV;
128         }
129 
130         pdregw(hydra_bit_data.data, 0);         /* clear SCLK_OE and SDAT_OE */
131         hydra_adap.dev.parent = &dev->dev;
132         res = i2c_bit_add_bus(&hydra_adap);
133         if (res < 0) {
134                 iounmap(hydra_bit_data.data);
135                 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
136                 return res;
137         }
138         return 0;
139 }
140 
141 static void hydra_remove(struct pci_dev *dev)
142 {
143         pdregw(hydra_bit_data.data, 0);         /* clear SCLK_OE and SDAT_OE */
144         i2c_del_adapter(&hydra_adap);
145         iounmap(hydra_bit_data.data);
146         release_mem_region(pci_resource_start(dev, 0)+
147                            offsetof(struct Hydra, CachePD), 4);
148 }
149 
150 
151 static struct pci_driver hydra_driver = {
152         .name           = "hydra_smbus",
153         .id_table       = hydra_ids,
154         .probe          = hydra_probe,
155         .remove         = hydra_remove,
156 };
157 
158 module_pci_driver(hydra_driver);
159 
160 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
161 MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
162 MODULE_LICENSE("GPL");
163 

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