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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 i2c Support for the Apple `Hydra' Mac I/O
4
5 Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org>
6
7 Based on i2c Support for Via Technologies 82C586B South Bridge
8 Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
9
10*/
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/pci.h>
15#include <linux/types.h>
16#include <linux/i2c.h>
17#include <linux/i2c-algo-bit.h>
18#include <linux/io.h>
19#include <asm/hydra.h>
20
21
22#define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */
23#define HYDRA_CPD_PD1 0x00000002
24#define HYDRA_CPD_PD2 0x00000004
25#define HYDRA_CPD_PD3 0x00000008
26
27#define HYDRA_SCLK HYDRA_CPD_PD0
28#define HYDRA_SDAT HYDRA_CPD_PD1
29#define HYDRA_SCLK_OE 0x00000010
30#define HYDRA_SDAT_OE 0x00000020
31
32static inline void pdregw(void *data, u32 val)
33{
34 struct Hydra *hydra = (struct Hydra *)data;
35 writel(val, &hydra->CachePD);
36}
37
38static inline u32 pdregr(void *data)
39{
40 struct Hydra *hydra = (struct Hydra *)data;
41 return readl(&hydra->CachePD);
42}
43
44static void hydra_bit_setscl(void *data, int state)
45{
46 u32 val = pdregr(data);
47 if (state)
48 val &= ~HYDRA_SCLK_OE;
49 else {
50 val &= ~HYDRA_SCLK;
51 val |= HYDRA_SCLK_OE;
52 }
53 pdregw(data, val);
54}
55
56static void hydra_bit_setsda(void *data, int state)
57{
58 u32 val = pdregr(data);
59 if (state)
60 val &= ~HYDRA_SDAT_OE;
61 else {
62 val &= ~HYDRA_SDAT;
63 val |= HYDRA_SDAT_OE;
64 }
65 pdregw(data, val);
66}
67
68static int hydra_bit_getscl(void *data)
69{
70 return (pdregr(data) & HYDRA_SCLK) != 0;
71}
72
73static int hydra_bit_getsda(void *data)
74{
75 return (pdregr(data) & HYDRA_SDAT) != 0;
76}
77
78/* ------------------------------------------------------------------------ */
79
80static struct i2c_algo_bit_data hydra_bit_data = {
81 .setsda = hydra_bit_setsda,
82 .setscl = hydra_bit_setscl,
83 .getsda = hydra_bit_getsda,
84 .getscl = hydra_bit_getscl,
85 .udelay = 5,
86 .timeout = HZ
87};
88
89static struct i2c_adapter hydra_adap = {
90 .owner = THIS_MODULE,
91 .name = "Hydra i2c",
92 .algo_data = &hydra_bit_data,
93};
94
95static const struct pci_device_id hydra_ids[] = {
96 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
97 { 0, }
98};
99
100MODULE_DEVICE_TABLE (pci, hydra_ids);
101
102static int hydra_probe(struct pci_dev *dev,
103 const struct pci_device_id *id)
104{
105 unsigned long base = pci_resource_start(dev, 0);
106 int res;
107
108 if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
109 hydra_adap.name))
110 return -EBUSY;
111
112 hydra_bit_data.data = pci_ioremap_bar(dev, 0);
113 if (hydra_bit_data.data == NULL) {
114 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
115 return -ENODEV;
116 }
117
118 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
119 hydra_adap.dev.parent = &dev->dev;
120 res = i2c_bit_add_bus(&hydra_adap);
121 if (res < 0) {
122 iounmap(hydra_bit_data.data);
123 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
124 return res;
125 }
126 return 0;
127}
128
129static void hydra_remove(struct pci_dev *dev)
130{
131 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
132 i2c_del_adapter(&hydra_adap);
133 iounmap(hydra_bit_data.data);
134 release_mem_region(pci_resource_start(dev, 0)+
135 offsetof(struct Hydra, CachePD), 4);
136}
137
138
139static struct pci_driver hydra_driver = {
140 .name = "hydra_smbus",
141 .id_table = hydra_ids,
142 .probe = hydra_probe,
143 .remove = hydra_remove,
144};
145
146module_pci_driver(hydra_driver);
147
148MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
149MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
150MODULE_LICENSE("GPL");
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
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 /* CachePD lines */
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); /* clear SCLK_OE and SDAT_OE */
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); /* clear SCLK_OE and SDAT_OE */
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");