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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/init.h>
31#include <asm/io.h>
32#include <asm/hydra.h>
33
34
35#define HYDRA_CPD_PD0 0x00000001
36#define HYDRA_CPD_PD1 0x00000002
37#define HYDRA_CPD_PD2 0x00000004
38#define HYDRA_CPD_PD3 0x00000008
39
40#define HYDRA_SCLK HYDRA_CPD_PD0
41#define HYDRA_SDAT HYDRA_CPD_PD1
42#define HYDRA_SCLK_OE 0x00000010
43#define HYDRA_SDAT_OE 0x00000020
44
45static inline void pdregw(void *data, u32 val)
46{
47 struct Hydra *hydra = (struct Hydra *)data;
48 writel(val, &hydra->CachePD);
49}
50
51static inline u32 pdregr(void *data)
52{
53 struct Hydra *hydra = (struct Hydra *)data;
54 return readl(&hydra->CachePD);
55}
56
57static void hydra_bit_setscl(void *data, int state)
58{
59 u32 val = pdregr(data);
60 if (state)
61 val &= ~HYDRA_SCLK_OE;
62 else {
63 val &= ~HYDRA_SCLK;
64 val |= HYDRA_SCLK_OE;
65 }
66 pdregw(data, val);
67}
68
69static void hydra_bit_setsda(void *data, int state)
70{
71 u32 val = pdregr(data);
72 if (state)
73 val &= ~HYDRA_SDAT_OE;
74 else {
75 val &= ~HYDRA_SDAT;
76 val |= HYDRA_SDAT_OE;
77 }
78 pdregw(data, val);
79}
80
81static int hydra_bit_getscl(void *data)
82{
83 return (pdregr(data) & HYDRA_SCLK) != 0;
84}
85
86static int hydra_bit_getsda(void *data)
87{
88 return (pdregr(data) & HYDRA_SDAT) != 0;
89}
90
91
92
93static struct i2c_algo_bit_data hydra_bit_data = {
94 .setsda = hydra_bit_setsda,
95 .setscl = hydra_bit_setscl,
96 .getsda = hydra_bit_getsda,
97 .getscl = hydra_bit_getscl,
98 .udelay = 5,
99 .timeout = HZ
100};
101
102static struct i2c_adapter hydra_adap = {
103 .owner = THIS_MODULE,
104 .name = "Hydra i2c",
105 .algo_data = &hydra_bit_data,
106};
107
108static struct pci_device_id hydra_ids[] = {
109 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
110 { 0, }
111};
112
113MODULE_DEVICE_TABLE (pci, hydra_ids);
114
115static int __devinit hydra_probe(struct pci_dev *dev,
116 const struct pci_device_id *id)
117{
118 unsigned long base = pci_resource_start(dev, 0);
119 int res;
120
121 if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
122 hydra_adap.name))
123 return -EBUSY;
124
125 hydra_bit_data.data = pci_ioremap_bar(dev, 0);
126 if (hydra_bit_data.data == NULL) {
127 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
128 return -ENODEV;
129 }
130
131 pdregw(hydra_bit_data.data, 0);
132 hydra_adap.dev.parent = &dev->dev;
133 res = i2c_bit_add_bus(&hydra_adap);
134 if (res < 0) {
135 iounmap(hydra_bit_data.data);
136 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
137 return res;
138 }
139 return 0;
140}
141
142static void __devexit hydra_remove(struct pci_dev *dev)
143{
144 pdregw(hydra_bit_data.data, 0);
145 i2c_del_adapter(&hydra_adap);
146 iounmap(hydra_bit_data.data);
147 release_mem_region(pci_resource_start(dev, 0)+
148 offsetof(struct Hydra, CachePD), 4);
149}
150
151
152static struct pci_driver hydra_driver = {
153 .name = "hydra_smbus",
154 .id_table = hydra_ids,
155 .probe = hydra_probe,
156 .remove = __devexit_p(hydra_remove),
157};
158
159static int __init i2c_hydra_init(void)
160{
161 return pci_register_driver(&hydra_driver);
162}
163
164
165static void __exit i2c_hydra_exit(void)
166{
167 pci_unregister_driver(&hydra_driver);
168}
169
170
171
172MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
173MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
174MODULE_LICENSE("GPL");
175
176module_init(i2c_hydra_init);
177module_exit(i2c_hydra_exit);
178
179
