1 /* 2 SMBus driver for nVidia nForce2 MCP 3 4 Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>, 5 Ported to 2.5 Patrick Dreker <patrick@dreker.de>, 6 Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>, 7 Based on 8 SMBus 2.0 driver for AMD-8111 IO-Hub 9 Copyright (c) 2002 Vojtech Pavlik 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 2 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software 23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26 /* 27 SUPPORTED DEVICES PCI ID 28 nForce2 MCP 0064 29 nForce2 Ultra 400 MCP 0084 30 nForce3 Pro150 MCP 00D4 31 nForce3 250Gb MCP 00E4 32 nForce4 MCP 0052 33 nForce4 MCP-04 0034 34 nForce4 MCP51 0264 35 nForce4 MCP55 0368 36 37 This driver supports the 2 SMBuses that are included in the MCP of the 38 nForce2/3/4/5xx chipsets. 39 */ 40 41 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */ 42 43 #include <linux/module.h> 44 #include <linux/pci.h> 45 #include <linux/kernel.h> 46 #include <linux/stddef.h> 47 #include <linux/sched.h> 48 #include <linux/ioport.h> 49 #include <linux/init.h> 50 #include <linux/i2c.h> 51 #include <linux/delay.h> 52 #include <asm/io.h> 53 54 MODULE_LICENSE("GPL"); 55 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>"); 56 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver"); 57 58 59 struct nforce2_smbus { 60 struct pci_dev *dev; 61 struct i2c_adapter adapter; 62 int base; 63 int size; 64 }; 65 66 67 /* 68 * nVidia nForce2 SMBus control register definitions 69 * (Newer incarnations use standard BARs 4 and 5 instead) 70 */ 71 #define NFORCE_PCI_SMB1 0x50 72 #define NFORCE_PCI_SMB2 0x54 73 74 75 /* 76 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model 77 */ 78 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */ 79 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */ 80 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */ 81 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */ 82 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */ 83 84 #define NVIDIA_SMB_STS_DONE 0x80 85 #define NVIDIA_SMB_STS_ALRM 0x40 86 #define NVIDIA_SMB_STS_RES 0x20 87 #define NVIDIA_SMB_STS_STATUS 0x1f 88 89 #define NVIDIA_SMB_PRTCL_WRITE 0x00 90 #define NVIDIA_SMB_PRTCL_READ 0x01 91 #define NVIDIA_SMB_PRTCL_QUICK 0x02 92 #define NVIDIA_SMB_PRTCL_BYTE 0x04 93 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06 94 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08 95 #define NVIDIA_SMB_PRTCL_PEC 0x80 96 97 static struct pci_driver nforce2_driver; 98 99 /* Return -1 on error */ 100 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, 101 unsigned short flags, char read_write, 102 u8 command, int size, union i2c_smbus_data * data) 103 { 104 struct nforce2_smbus *smbus = adap->algo_data; 105 unsigned char protocol, pec, temp; 106 107 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ : 108 NVIDIA_SMB_PRTCL_WRITE; 109 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0; 110 111 switch (size) { 112 113 case I2C_SMBUS_QUICK: 114 protocol |= NVIDIA_SMB_PRTCL_QUICK; 115 read_write = I2C_SMBUS_WRITE; 116 break; 117 118 case I2C_SMBUS_BYTE: 119 if (read_write == I2C_SMBUS_WRITE) 120 outb_p(command, NVIDIA_SMB_CMD); 121 protocol |= NVIDIA_SMB_PRTCL_BYTE; 122 break; 123 124 case I2C_SMBUS_BYTE_DATA: 125 outb_p(command, NVIDIA_SMB_CMD); 126 if (read_write == I2C_SMBUS_WRITE) 127 outb_p(data->byte, NVIDIA_SMB_DATA); 128 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA; 129 break; 130 131 case I2C_SMBUS_WORD_DATA: 132 outb_p(command, NVIDIA_SMB_CMD); 133 if (read_write == I2C_SMBUS_WRITE) { 134 outb_p(data->word, NVIDIA_SMB_DATA); 135 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1); 136 } 137 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec; 138 break; 139 140 default: 141 dev_err(&adap->dev, "Unsupported transaction %d\n", size); 142 return -1; 143 } 144 145 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR); 146 outb_p(protocol, NVIDIA_SMB_PRTCL); 147 148 temp = inb_p(NVIDIA_SMB_STS); 149 150 if (~temp & NVIDIA_SMB_STS_DONE) { 151 udelay(500); 152 temp = inb_p(NVIDIA_SMB_STS); 153 } 154 if (~temp & NVIDIA_SMB_STS_DONE) { 155 msleep(10); 156 temp = inb_p(NVIDIA_SMB_STS); 157 } 158 159 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { 160 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp); 161 return -1; 162 } 163 164 if (read_write == I2C_SMBUS_WRITE) 165 return 0; 166 167 switch (size) { 168 169 case I2C_SMBUS_BYTE: 170 case I2C_SMBUS_BYTE_DATA: 171 data->byte = inb_p(NVIDIA_SMB_DATA); 172 break; 173 174 case I2C_SMBUS_WORD_DATA: 175 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8); 176 break; 177 } 178 179 return 0; 180 } 181 182 183 static u32 nforce2_func(struct i2c_adapter *adapter) 184 { 185 /* other functionality might be possible, but is not tested */ 186 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 187 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA; 188 } 189 190 static struct i2c_algorithm smbus_algorithm = { 191 .smbus_xfer = nforce2_access, 192 .functionality = nforce2_func, 193 }; 194 195 196 static struct pci_device_id nforce2_ids[] = { 197 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) }, 198 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) }, 199 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) }, 200 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) }, 201 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) }, 202 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) }, 203 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) }, 204 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) }, 205 { 0 } 206 }; 207 208 MODULE_DEVICE_TABLE (pci, nforce2_ids); 209 210 211 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar, 212 int alt_reg, struct nforce2_smbus *smbus, const char *name) 213 { 214 int error; 215 216 smbus->base = pci_resource_start(dev, bar); 217 if (smbus->base) { 218 smbus->size = pci_resource_len(dev, bar); 219 } else { 220 /* Older incarnations of the device used non-standard BARs */ 221 u16 iobase; 222 223 if (pci_read_config_word(dev, alt_reg, &iobase) 224 != PCIBIOS_SUCCESSFUL) { 225 dev_err(&dev->dev, "Error reading PCI config for %s\n", 226 name); 227 return -1; 228 } 229 230 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK; 231 smbus->size = 64; 232 } 233 smbus->dev = dev; 234 235 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) { 236 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n", 237 smbus->base, smbus->base+smbus->size-1, name); 238 return -1; 239 } 240 smbus->adapter.owner = THIS_MODULE; 241 smbus->adapter.class = I2C_CLASS_HWMON; 242 smbus->adapter.algo = &smbus_algorithm; 243 smbus->adapter.algo_data = smbus; 244 smbus->adapter.dev.parent = &dev->dev; 245 snprintf(smbus->adapter.name, I2C_NAME_SIZE, 246 "SMBus nForce2 adapter at %04x", smbus->base); 247 248 error = i2c_add_adapter(&smbus->adapter); 249 if (error) { 250 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n"); 251 release_region(smbus->base, smbus->size); 252 return -1; 253 } 254 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base); 255 return 0; 256 } 257 258 259 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id) 260 { 261 struct nforce2_smbus *smbuses; 262 int res1, res2; 263 264 /* we support 2 SMBus adapters */ 265 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL))) 266 return -ENOMEM; 267 pci_set_drvdata(dev, smbuses); 268 269 /* SMBus adapter 1 */ 270 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); 271 if (res1 < 0) { 272 dev_err(&dev->dev, "Error probing SMB1.\n"); 273 smbuses[0].base = 0; /* to have a check value */ 274 } 275 /* SMBus adapter 2 */ 276 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2"); 277 if (res2 < 0) { 278 dev_err(&dev->dev, "Error probing SMB2.\n"); 279 smbuses[1].base = 0; /* to have a check value */ 280 } 281 if ((res1 < 0) && (res2 < 0)) { 282 /* we did not find even one of the SMBuses, so we give up */ 283 kfree(smbuses); 284 return -ENODEV; 285 } 286 287 return 0; 288 } 289 290 291 static void __devexit nforce2_remove(struct pci_dev *dev) 292 { 293 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev); 294 295 if (smbuses[0].base) { 296 i2c_del_adapter(&smbuses[0].adapter); 297 release_region(smbuses[0].base, smbuses[0].size); 298 } 299 if (smbuses[1].base) { 300 i2c_del_adapter(&smbuses[1].adapter); 301 release_region(smbuses[1].base, smbuses[1].size); 302 } 303 kfree(smbuses); 304 } 305 306 static struct pci_driver nforce2_driver = { 307 .name = "nForce2_smbus", 308 .id_table = nforce2_ids, 309 .probe = nforce2_probe, 310 .remove = __devexit_p(nforce2_remove), 311 }; 312 313 static int __init nforce2_init(void) 314 { 315 return pci_register_driver(&nforce2_driver); 316 } 317 318 static void __exit nforce2_exit(void) 319 { 320 pci_unregister_driver(&nforce2_driver); 321 } 322 323 module_init(nforce2_init); 324 module_exit(nforce2_exit); 325 326