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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>
26#include <linux/io.h>
27#include <asm/hydra.h>
28
29
30#define HYDRA_CPD_PD0 0x00000001
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
40static inline void pdregw(void *data, u32 val)
41{
42 struct Hydra *hydra = (struct Hydra *)data;
43 writel(val, &hydra->CachePD);
44}
45
46static inline u32 pdregr(void *data)
47{
48 struct Hydra *hydra = (struct Hydra *)data;
49 return readl(&hydra->CachePD);
50}
51
52static 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
64static 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
76static int hydra_bit_getscl(void *data)
77{
78 return (pdregr(data) & HYDRA_SCLK) != 0;
79}
80
81static int hydra_bit_getsda(void *data)
82{
83 return (pdregr(data) & HYDRA_SDAT) != 0;
84}
85
86
87
88static 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,
94 .timeout = HZ
95};
96
97static struct i2c_adapter hydra_adap = {
98 .owner = THIS_MODULE,
99 .name = "Hydra i2c",
100 .algo_data = &hydra_bit_data,
101};
102
103static const struct pci_device_id hydra_ids[] = {
104 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
105 { 0, }
106};
107
108MODULE_DEVICE_TABLE (pci, hydra_ids);
109
110static int hydra_probe(struct pci_dev *dev,
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
120 hydra_bit_data.data = pci_ioremap_bar(dev, 0);
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);
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
137static void hydra_remove(struct pci_dev *dev)
138{
139 pdregw(hydra_bit_data.data, 0);
140 i2c_del_adapter(&hydra_adap);
141 iounmap(hydra_bit_data.data);
142 release_mem_region(pci_resource_start(dev, 0)+
143 offsetof(struct Hydra, CachePD), 4);
144}
145
146
147static struct pci_driver hydra_driver = {
148 .name = "hydra_smbus",
149 .id_table = hydra_ids,
150 .probe = hydra_probe,
151 .remove = hydra_remove,
152};
153
154module_pci_driver(hydra_driver);
155
156MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
157MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
158MODULE_LICENSE("GPL");
159
