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/init.h> 31 #include <asm/io.h> 32 #include <asm/hydra.h> 33 34 35 #define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */ 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 45 static inline void pdregw(void *data, u32 val) 46 { 47 struct Hydra *hydra = (struct Hydra *)data; 48 writel(val, &hydra->CachePD); 49 } 50 51 static inline u32 pdregr(void *data) 52 { 53 struct Hydra *hydra = (struct Hydra *)data; 54 return readl(&hydra->CachePD); 55 } 56 57 static 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 69 static 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 81 static int hydra_bit_getscl(void *data) 82 { 83 return (pdregr(data) & HYDRA_SCLK) != 0; 84 } 85 86 static int hydra_bit_getsda(void *data) 87 { 88 return (pdregr(data) & HYDRA_SDAT) != 0; 89 } 90 91 /* ------------------------------------------------------------------------ */ 92 93 static 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 }; 101 102 static struct i2c_adapter hydra_adap = { 103 .owner = THIS_MODULE, 104 .name = "Hydra i2c", 105 .id = I2C_HW_B_HYDRA, 106 .algo_data = &hydra_bit_data, 107 }; 108 109 static struct pci_device_id hydra_ids[] = { 110 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) }, 111 { 0, } 112 }; 113 114 MODULE_DEVICE_TABLE (pci, hydra_ids); 115 116 static int __devinit hydra_probe(struct pci_dev *dev, 117 const struct pci_device_id *id) 118 { 119 unsigned long base = pci_resource_start(dev, 0); 120 int res; 121 122 if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4, 123 hydra_adap.name)) 124 return -EBUSY; 125 126 hydra_bit_data.data = pci_ioremap_bar(dev, 0); 127 if (hydra_bit_data.data == NULL) { 128 release_mem_region(base+offsetof(struct Hydra, CachePD), 4); 129 return -ENODEV; 130 } 131 132 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ 133 hydra_adap.dev.parent = &dev->dev; 134 res = i2c_bit_add_bus(&hydra_adap); 135 if (res < 0) { 136 iounmap(hydra_bit_data.data); 137 release_mem_region(base+offsetof(struct Hydra, CachePD), 4); 138 return res; 139 } 140 return 0; 141 } 142 143 static void __devexit hydra_remove(struct pci_dev *dev) 144 { 145 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ 146 i2c_del_adapter(&hydra_adap); 147 iounmap(hydra_bit_data.data); 148 release_mem_region(pci_resource_start(dev, 0)+ 149 offsetof(struct Hydra, CachePD), 4); 150 } 151 152 153 static struct pci_driver hydra_driver = { 154 .name = "hydra_smbus", 155 .id_table = hydra_ids, 156 .probe = hydra_probe, 157 .remove = __devexit_p(hydra_remove), 158 }; 159 160 static int __init i2c_hydra_init(void) 161 { 162 return pci_register_driver(&hydra_driver); 163 } 164 165 166 static void __exit i2c_hydra_exit(void) 167 { 168 pci_unregister_driver(&hydra_driver); 169 } 170 171 172 173 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); 174 MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O"); 175 MODULE_LICENSE("GPL"); 176 177 module_init(i2c_hydra_init); 178 module_exit(i2c_hydra_exit); 179 180