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/ioport.h> 48 #include <linux/init.h> 49 #include <linux/i2c.h> 50 #include <linux/delay.h> 51 #include <asm/io.h> 52 53 MODULE_LICENSE("GPL"); 54 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>"); 55 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver"); 56 57 58 struct nforce2_smbus { 59 struct i2c_adapter adapter; 60 int base; 61 int size; 62 }; 63 64 65 /* 66 * nVidia nForce2 SMBus control register definitions 67 * (Newer incarnations use standard BARs 4 and 5 instead) 68 */ 69 #define NFORCE_PCI_SMB1 0x50 70 #define NFORCE_PCI_SMB2 0x54 71 72 73 /* 74 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model 75 */ 76 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */ 77 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */ 78 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */ 79 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */ 80 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */ 81 82 #define NVIDIA_SMB_STS_DONE 0x80 83 #define NVIDIA_SMB_STS_ALRM 0x40 84 #define NVIDIA_SMB_STS_RES 0x20 85 #define NVIDIA_SMB_STS_STATUS 0x1f 86 87 #define NVIDIA_SMB_PRTCL_WRITE 0x00 88 #define NVIDIA_SMB_PRTCL_READ 0x01 89 #define NVIDIA_SMB_PRTCL_QUICK 0x02 90 #define NVIDIA_SMB_PRTCL_BYTE 0x04 91 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06 92 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08 93 #define NVIDIA_SMB_PRTCL_PEC 0x80 94 95 static struct pci_driver nforce2_driver; 96 97 /* Return -1 on error */ 98 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, 99 unsigned short flags, char read_write, 100 u8 command, int size, union i2c_smbus_data * data) 101 { 102 struct nforce2_smbus *smbus = adap->algo_data; 103 unsigned char protocol, pec, temp; 104 105 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ : 106 NVIDIA_SMB_PRTCL_WRITE; 107 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0; 108 109 switch (size) { 110 111 case I2C_SMBUS_QUICK: 112 protocol |= NVIDIA_SMB_PRTCL_QUICK; 113 read_write = I2C_SMBUS_WRITE; 114 break; 115 116 case I2C_SMBUS_BYTE: 117 if (read_write == I2C_SMBUS_WRITE) 118 outb_p(command, NVIDIA_SMB_CMD); 119 protocol |= NVIDIA_SMB_PRTCL_BYTE; 120 break; 121 122 case I2C_SMBUS_BYTE_DATA: 123 outb_p(command, NVIDIA_SMB_CMD); 124 if (read_write == I2C_SMBUS_WRITE) 125 outb_p(data->byte, NVIDIA_SMB_DATA); 126 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA; 127 break; 128 129 case I2C_SMBUS_WORD_DATA: 130 outb_p(command, NVIDIA_SMB_CMD); 131 if (read_write == I2C_SMBUS_WRITE) { 132 outb_p(data->word, NVIDIA_SMB_DATA); 133 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1); 134 } 135 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec; 136 break; 137 138 default: 139 dev_err(&adap->dev, "Unsupported transaction %d\n", size); 140 return -1; 141 } 142 143 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR); 144 outb_p(protocol, NVIDIA_SMB_PRTCL); 145 146 temp = inb_p(NVIDIA_SMB_STS); 147 148 if (~temp & NVIDIA_SMB_STS_DONE) { 149 udelay(500); 150 temp = inb_p(NVIDIA_SMB_STS); 151 } 152 if (~temp & NVIDIA_SMB_STS_DONE) { 153 msleep(10); 154 temp = inb_p(NVIDIA_SMB_STS); 155 } 156 157 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { 158 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp); 159 return -1; 160 } 161 162 if (read_write == I2C_SMBUS_WRITE) 163 return 0; 164 165 switch (size) { 166 167 case I2C_SMBUS_BYTE: 168 case I2C_SMBUS_BYTE_DATA: 169 data->byte = inb_p(NVIDIA_SMB_DATA); 170 break; 171 172 case I2C_SMBUS_WORD_DATA: 173 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8); 174 break; 175 } 176 177 return 0; 178 } 179 180 181 static u32 nforce2_func(struct i2c_adapter *adapter) 182 { 183 /* other functionality might be possible, but is not tested */ 184 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 185 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA; 186 } 187 188 static struct i2c_algorithm smbus_algorithm = { 189 .smbus_xfer = nforce2_access, 190 .functionality = nforce2_func, 191 }; 192 193 194 static struct pci_device_id nforce2_ids[] = { 195 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) }, 196 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) }, 197 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) }, 198 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) }, 199 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) }, 200 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) }, 201 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) }, 202 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) }, 203 { 0 } 204 }; 205 206 MODULE_DEVICE_TABLE (pci, nforce2_ids); 207 208 209 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar, 210 int alt_reg, struct nforce2_smbus *smbus, const char *name) 211 { 212 int error; 213 214 smbus->base = pci_resource_start(dev, bar); 215 if (smbus->base) { 216 smbus->size = pci_resource_len(dev, bar); 217 } else { 218 /* Older incarnations of the device used non-standard BARs */ 219 u16 iobase; 220 221 if (pci_read_config_word(dev, alt_reg, &iobase) 222 != PCIBIOS_SUCCESSFUL) { 223 dev_err(&dev->dev, "Error reading PCI config for %s\n", 224 name); 225 return -1; 226 } 227 228 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK; 229 smbus->size = 64; 230 } 231 232 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) { 233 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n", 234 smbus->base, smbus->base+smbus->size-1, name); 235 return -1; 236 } 237 smbus->adapter.owner = THIS_MODULE; 238 smbus->adapter.id = I2C_HW_SMBUS_NFORCE2; 239 smbus->adapter.class = I2C_CLASS_HWMON; 240 smbus->adapter.algo = &smbus_algorithm; 241 smbus->adapter.algo_data = smbus; 242 smbus->adapter.dev.parent = &dev->dev; 243 snprintf(smbus->adapter.name, I2C_NAME_SIZE, 244 "SMBus nForce2 adapter at %04x", smbus->base); 245 246 error = i2c_add_adapter(&smbus->adapter); 247 if (error) { 248 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n"); 249 release_region(smbus->base, smbus->size); 250 return -1; 251 } 252 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base); 253 return 0; 254 } 255 256 257 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id) 258 { 259 struct nforce2_smbus *smbuses; 260 int res1, res2; 261 262 /* we support 2 SMBus adapters */ 263 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL))) 264 return -ENOMEM; 265 pci_set_drvdata(dev, smbuses); 266 267 /* SMBus adapter 1 */ 268 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); 269 if (res1 < 0) { 270 dev_err(&dev->dev, "Error probing SMB1.\n"); 271 smbuses[0].base = 0; /* to have a check value */ 272 } 273 /* SMBus adapter 2 */ 274 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2"); 275 if (res2 < 0) { 276 dev_err(&dev->dev, "Error probing SMB2.\n"); 277 smbuses[1].base = 0; /* to have a check value */ 278 } 279 if ((res1 < 0) && (res2 < 0)) { 280 /* we did not find even one of the SMBuses, so we give up */ 281 kfree(smbuses); 282 return -ENODEV; 283 } 284 285 return 0; 286 } 287 288 289 static void __devexit nforce2_remove(struct pci_dev *dev) 290 { 291 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev); 292 293 if (smbuses[0].base) { 294 i2c_del_adapter(&smbuses[0].adapter); 295 release_region(smbuses[0].base, smbuses[0].size); 296 } 297 if (smbuses[1].base) { 298 i2c_del_adapter(&smbuses[1].adapter); 299 release_region(smbuses[1].base, smbuses[1].size); 300 } 301 kfree(smbuses); 302 } 303 304 static struct pci_driver nforce2_driver = { 305 .name = "nForce2_smbus", 306 .id_table = nforce2_ids, 307 .probe = nforce2_probe, 308 .remove = __devexit_p(nforce2_remove), 309 }; 310 311 static int __init nforce2_init(void) 312 { 313 return pci_register_driver(&nforce2_driver); 314 } 315 316 static void __exit nforce2_exit(void) 317 { 318 pci_unregister_driver(&nforce2_driver); 319 } 320 321 module_init(nforce2_init); 322 module_exit(nforce2_exit); 323 324