Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 2 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> |
| 4 | |
| 5 | National Semiconductor SCx200 ACCESS.bus support |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 6 | Also supports the AMD CS5535 and AMD CS5536 |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | Based on i2c-keywest.c which is: |
| 9 | Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
| 10 | Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com> |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/i2c.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/pci.h> |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 22 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/delay.h> |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 24 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
H Hartley Sweeten | 2178218 | 2010-05-21 18:41:01 +0200 | [diff] [blame] | 26 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | #include <linux/scx200.h> |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); |
| 31 | MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver"); |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 32 | MODULE_ALIAS("platform:cs5535-smb"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | MODULE_LICENSE("GPL"); |
| 34 | |
| 35 | #define MAX_DEVICES 4 |
| 36 | static int base[MAX_DEVICES] = { 0x820, 0x840 }; |
David Howells | c78babc | 2017-04-04 16:54:23 +0100 | [diff] [blame] | 37 | module_param_hw_array(base, int, ioport, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers"); |
| 39 | |
Ben Gardner | f933ff5 | 2006-01-18 22:52:06 +0100 | [diff] [blame] | 40 | #define POLL_TIMEOUT (HZ/5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | enum scx200_acb_state { |
| 43 | state_idle, |
| 44 | state_address, |
| 45 | state_command, |
| 46 | state_repeat_start, |
| 47 | state_quick, |
| 48 | state_read, |
| 49 | state_write, |
| 50 | }; |
| 51 | |
| 52 | static const char *scx200_acb_state_name[] = { |
| 53 | "idle", |
| 54 | "address", |
| 55 | "command", |
| 56 | "repeat_start", |
| 57 | "quick", |
| 58 | "read", |
| 59 | "write", |
| 60 | }; |
| 61 | |
| 62 | /* Physical interface */ |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 63 | struct scx200_acb_iface { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | struct scx200_acb_iface *next; |
| 65 | struct i2c_adapter adapter; |
| 66 | unsigned base; |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 67 | struct mutex mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | /* State machine data */ |
| 70 | enum scx200_acb_state state; |
| 71 | int result; |
| 72 | u8 address_byte; |
| 73 | u8 command; |
| 74 | u8 *ptr; |
| 75 | char needs_reset; |
| 76 | unsigned len; |
| 77 | }; |
| 78 | |
| 79 | /* Register Definitions */ |
| 80 | #define ACBSDA (iface->base + 0) |
| 81 | #define ACBST (iface->base + 1) |
| 82 | #define ACBST_SDAST 0x40 /* SDA Status */ |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 83 | #define ACBST_BER 0x20 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #define ACBST_NEGACK 0x10 /* Negative Acknowledge */ |
| 85 | #define ACBST_STASTR 0x08 /* Stall After Start */ |
| 86 | #define ACBST_MASTER 0x02 |
| 87 | #define ACBCST (iface->base + 2) |
| 88 | #define ACBCST_BB 0x02 |
| 89 | #define ACBCTL1 (iface->base + 3) |
| 90 | #define ACBCTL1_STASTRE 0x80 |
| 91 | #define ACBCTL1_NMINTE 0x40 |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 92 | #define ACBCTL1_ACK 0x10 |
| 93 | #define ACBCTL1_STOP 0x02 |
| 94 | #define ACBCTL1_START 0x01 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #define ACBADDR (iface->base + 4) |
| 96 | #define ACBCTL2 (iface->base + 5) |
| 97 | #define ACBCTL2_ENABLE 0x01 |
| 98 | |
| 99 | /************************************************************************/ |
| 100 | |
| 101 | static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) |
| 102 | { |
| 103 | const char *errmsg; |
| 104 | |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 105 | dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n", |
| 106 | scx200_acb_state_name[iface->state], status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | if (status & ACBST_BER) { |
| 109 | errmsg = "bus error"; |
| 110 | goto error; |
| 111 | } |
| 112 | if (!(status & ACBST_MASTER)) { |
| 113 | errmsg = "not master"; |
| 114 | goto error; |
| 115 | } |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 116 | if (status & ACBST_NEGACK) { |
| 117 | dev_dbg(&iface->adapter.dev, "negative ack in state %s\n", |
| 118 | scx200_acb_state_name[iface->state]); |
| 119 | |
| 120 | iface->state = state_idle; |
| 121 | iface->result = -ENXIO; |
| 122 | |
| 123 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 124 | outb(ACBST_STASTR | ACBST_NEGACK, ACBST); |
Jordan Crouse | 95563d3 | 2006-04-28 22:53:30 +0200 | [diff] [blame] | 125 | |
| 126 | /* Reset the status register */ |
| 127 | outb(0, ACBST); |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 128 | return; |
| 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | switch (iface->state) { |
| 132 | case state_idle: |
| 133 | dev_warn(&iface->adapter.dev, "interrupt in idle state\n"); |
| 134 | break; |
| 135 | |
| 136 | case state_address: |
| 137 | /* Do a pointer write first */ |
| 138 | outb(iface->address_byte & ~1, ACBSDA); |
| 139 | |
| 140 | iface->state = state_command; |
| 141 | break; |
| 142 | |
| 143 | case state_command: |
| 144 | outb(iface->command, ACBSDA); |
| 145 | |
| 146 | if (iface->address_byte & 1) |
| 147 | iface->state = state_repeat_start; |
| 148 | else |
| 149 | iface->state = state_write; |
| 150 | break; |
| 151 | |
| 152 | case state_repeat_start: |
| 153 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); |
Gustavo A. R. Silva | 4db7e17 | 2020-07-21 18:05:10 -0500 | [diff] [blame] | 154 | fallthrough; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | case state_quick: |
| 157 | if (iface->address_byte & 1) { |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 158 | if (iface->len == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
| 160 | else |
| 161 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); |
| 162 | outb(iface->address_byte, ACBSDA); |
| 163 | |
| 164 | iface->state = state_read; |
| 165 | } else { |
| 166 | outb(iface->address_byte, ACBSDA); |
| 167 | |
| 168 | iface->state = state_write; |
| 169 | } |
| 170 | break; |
| 171 | |
| 172 | case state_read: |
Thomas Andrews | fd627a0 | 2006-07-01 17:05:12 +0200 | [diff] [blame] | 173 | /* Set ACK if _next_ byte will be the last one */ |
| 174 | if (iface->len == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
| 176 | else |
| 177 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); |
| 178 | |
Thomas Andrews | fd627a0 | 2006-07-01 17:05:12 +0200 | [diff] [blame] | 179 | if (iface->len == 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | iface->result = 0; |
| 181 | iface->state = state_idle; |
| 182 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 183 | } |
| 184 | |
Thomas Andrews | fd627a0 | 2006-07-01 17:05:12 +0200 | [diff] [blame] | 185 | *iface->ptr++ = inb(ACBSDA); |
| 186 | --iface->len; |
| 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | break; |
| 189 | |
| 190 | case state_write: |
| 191 | if (iface->len == 0) { |
| 192 | iface->result = 0; |
| 193 | iface->state = state_idle; |
| 194 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 195 | break; |
| 196 | } |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | outb(*iface->ptr++, ACBSDA); |
| 199 | --iface->len; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | break; |
| 202 | } |
| 203 | |
| 204 | return; |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | error: |
Willy Tarreau | fce96f3 | 2009-09-18 22:45:47 +0200 | [diff] [blame] | 207 | dev_err(&iface->adapter.dev, |
| 208 | "%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg, |
| 209 | scx200_acb_state_name[iface->state], iface->address_byte, |
| 210 | iface->len, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | iface->state = state_idle; |
| 213 | iface->result = -EIO; |
| 214 | iface->needs_reset = 1; |
| 215 | } |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | static void scx200_acb_poll(struct scx200_acb_iface *iface) |
| 218 | { |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 219 | u8 status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | unsigned long timeout; |
| 221 | |
| 222 | timeout = jiffies + POLL_TIMEOUT; |
David Woodhouse | 3e3183b | 2006-08-05 12:15:19 -0700 | [diff] [blame] | 223 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | status = inb(ACBST); |
Jordan Crouse | 95563d3 | 2006-04-28 22:53:30 +0200 | [diff] [blame] | 225 | |
| 226 | /* Reset the status register to avoid the hang */ |
| 227 | outb(0, ACBST); |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) { |
| 230 | scx200_acb_machine(iface, status); |
| 231 | return; |
| 232 | } |
David Woodhouse | 3e3183b | 2006-08-05 12:15:19 -0700 | [diff] [blame] | 233 | if (time_after(jiffies, timeout)) |
| 234 | break; |
| 235 | cpu_relax(); |
| 236 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 239 | dev_err(&iface->adapter.dev, "timeout in state %s\n", |
| 240 | scx200_acb_state_name[iface->state]); |
| 241 | |
| 242 | iface->state = state_idle; |
| 243 | iface->result = -EIO; |
| 244 | iface->needs_reset = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | static void scx200_acb_reset(struct scx200_acb_iface *iface) |
| 248 | { |
| 249 | /* Disable the ACCESS.bus device and Configure the SCL |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 250 | frequency: 16 clock cycles */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | outb(0x70, ACBCTL2); |
| 252 | /* Polling mode */ |
| 253 | outb(0, ACBCTL1); |
| 254 | /* Disable slave address */ |
| 255 | outb(0, ACBADDR); |
| 256 | /* Enable the ACCESS.bus device */ |
| 257 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); |
| 258 | /* Free STALL after START */ |
| 259 | outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1); |
| 260 | /* Send a STOP */ |
| 261 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 262 | /* Clear BER, NEGACK and STASTR bits */ |
| 263 | outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST); |
| 264 | /* Clear BB bit */ |
| 265 | outb(inb(ACBCST) | ACBCST_BB, ACBCST); |
| 266 | } |
| 267 | |
| 268 | static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter, |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 269 | u16 address, unsigned short flags, |
| 270 | char rw, u8 command, int size, |
| 271 | union i2c_smbus_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | { |
| 273 | struct scx200_acb_iface *iface = i2c_get_adapdata(adapter); |
| 274 | int len; |
| 275 | u8 *buffer; |
| 276 | u16 cur_word; |
| 277 | int rc; |
| 278 | |
| 279 | switch (size) { |
| 280 | case I2C_SMBUS_QUICK: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 281 | len = 0; |
| 282 | buffer = NULL; |
| 283 | break; |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | case I2C_SMBUS_BYTE: |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 286 | len = 1; |
| 287 | buffer = rw ? &data->byte : &command; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 288 | break; |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | case I2C_SMBUS_BYTE_DATA: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 291 | len = 1; |
| 292 | buffer = &data->byte; |
| 293 | break; |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | case I2C_SMBUS_WORD_DATA: |
| 296 | len = 2; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 297 | cur_word = cpu_to_le16(data->word); |
| 298 | buffer = (u8 *)&cur_word; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | break; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 300 | |
Jean Delvare | c3efacaa | 2006-07-01 17:06:43 +0200 | [diff] [blame] | 301 | case I2C_SMBUS_I2C_BLOCK_DATA: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 302 | len = data->block[0]; |
Jean Delvare | c3efacaa | 2006-07-01 17:06:43 +0200 | [diff] [blame] | 303 | if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) |
| 304 | return -EINVAL; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 305 | buffer = &data->block[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | break; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | default: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 309 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 312 | dev_dbg(&adapter->dev, |
| 313 | "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n", |
| 314 | size, address, command, len, rw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | if (!len && rw == I2C_SMBUS_READ) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 317 | dev_dbg(&adapter->dev, "zero length read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return -EINVAL; |
| 319 | } |
| 320 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 321 | mutex_lock(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 323 | iface->address_byte = (address << 1) | rw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | iface->command = command; |
| 325 | iface->ptr = buffer; |
| 326 | iface->len = len; |
| 327 | iface->result = -EINVAL; |
| 328 | iface->needs_reset = 0; |
| 329 | |
| 330 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); |
| 331 | |
| 332 | if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) |
| 333 | iface->state = state_quick; |
| 334 | else |
| 335 | iface->state = state_address; |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | while (iface->state != state_idle) |
| 338 | scx200_acb_poll(iface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | if (iface->needs_reset) |
| 341 | scx200_acb_reset(iface); |
| 342 | |
| 343 | rc = iface->result; |
| 344 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 345 | mutex_unlock(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
| 347 | if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ) |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 348 | data->word = le16_to_cpu(cur_word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | #ifdef DEBUG |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 351 | dev_dbg(&adapter->dev, "transfer done, result: %d", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | if (buffer) { |
| 353 | int i; |
| 354 | printk(" data:"); |
| 355 | for (i = 0; i < len; ++i) |
| 356 | printk(" %02x", buffer[i]); |
| 357 | } |
| 358 | printk("\n"); |
| 359 | #endif |
| 360 | |
| 361 | return rc; |
| 362 | } |
| 363 | |
| 364 | static u32 scx200_acb_func(struct i2c_adapter *adapter) |
| 365 | { |
| 366 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
| 367 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
Jean Delvare | c3efacaa | 2006-07-01 17:06:43 +0200 | [diff] [blame] | 368 | I2C_FUNC_SMBUS_I2C_BLOCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | /* For now, we only handle combined mode (smbus) */ |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 372 | static const struct i2c_algorithm scx200_acb_algorithm = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | .smbus_xfer = scx200_acb_smbus_xfer, |
| 374 | .functionality = scx200_acb_func, |
| 375 | }; |
| 376 | |
| 377 | static struct scx200_acb_iface *scx200_acb_list; |
Matthias Kaehlcke | 9d9c01c | 2007-07-12 14:12:28 +0200 | [diff] [blame] | 378 | static DEFINE_MUTEX(scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 380 | static int scx200_acb_probe(struct scx200_acb_iface *iface) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | { |
| 382 | u8 val; |
| 383 | |
| 384 | /* Disable the ACCESS.bus device and Configure the SCL |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 385 | frequency: 16 clock cycles */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | outb(0x70, ACBCTL2); |
| 387 | |
| 388 | if (inb(ACBCTL2) != 0x70) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 389 | pr_debug("ACBCTL2 readback failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | return -ENXIO; |
| 391 | } |
| 392 | |
| 393 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); |
| 394 | |
| 395 | val = inb(ACBCTL1); |
| 396 | if (val) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 397 | pr_debug("disabled, but ACBCTL1=0x%02x\n", val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | return -ENXIO; |
| 399 | } |
| 400 | |
| 401 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); |
| 402 | |
| 403 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); |
| 404 | |
| 405 | val = inb(ACBCTL1); |
| 406 | if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 407 | pr_debug("enabled, but NMINTE won't be set, ACBCTL1=0x%02x\n", |
| 408 | val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | return -ENXIO; |
| 410 | } |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 415 | static struct scx200_acb_iface *scx200_create_iface(const char *text, |
Jean Delvare | 12a917f | 2007-02-13 22:09:03 +0100 | [diff] [blame] | 416 | struct device *dev, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | { |
| 418 | struct scx200_acb_iface *iface; |
| 419 | struct i2c_adapter *adapter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 421 | iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
Jingoo Han | 46797a2 | 2014-05-13 10:51:58 +0900 | [diff] [blame] | 422 | if (!iface) |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 423 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | adapter = &iface->adapter; |
| 426 | i2c_set_adapdata(adapter, iface); |
David Brownell | 2096b95 | 2007-05-01 23:26:28 +0200 | [diff] [blame] | 427 | snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | adapter->owner = THIS_MODULE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | adapter->algo = &scx200_acb_algorithm; |
Jean Delvare | 3401b2f | 2008-07-14 22:38:29 +0200 | [diff] [blame] | 430 | adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; |
Jean Delvare | 12a917f | 2007-02-13 22:09:03 +0100 | [diff] [blame] | 431 | adapter->dev.parent = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 433 | mutex_init(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 435 | return iface; |
| 436 | } |
| 437 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 438 | static int scx200_acb_create(struct scx200_acb_iface *iface) |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 439 | { |
| 440 | struct i2c_adapter *adapter; |
| 441 | int rc; |
| 442 | |
| 443 | adapter = &iface->adapter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | rc = scx200_acb_probe(iface); |
| 446 | if (rc) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 447 | pr_warn("probe failed\n"); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 448 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | scx200_acb_reset(iface); |
| 452 | |
| 453 | if (i2c_add_adapter(adapter) < 0) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 454 | pr_err("failed to register\n"); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 455 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | } |
| 457 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 458 | if (!adapter->dev.parent) { |
| 459 | /* If there's no dev, we're tracking (ISA) ifaces manually */ |
| 460 | mutex_lock(&scx200_acb_list_mutex); |
| 461 | iface->next = scx200_acb_list; |
| 462 | scx200_acb_list = iface; |
| 463 | mutex_unlock(&scx200_acb_list_mutex); |
| 464 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
| 466 | return 0; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 469 | static struct scx200_acb_iface *scx200_create_dev(const char *text, |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 470 | unsigned long base, int index, struct device *dev) |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 471 | { |
| 472 | struct scx200_acb_iface *iface; |
| 473 | int rc; |
| 474 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 475 | iface = scx200_create_iface(text, dev, index); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 476 | |
| 477 | if (iface == NULL) |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 478 | return NULL; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 479 | |
Adrian Bunk | dec1a99 | 2008-04-22 22:16:48 +0200 | [diff] [blame] | 480 | if (!request_region(base, 8, iface->adapter.name)) { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 481 | pr_err("can't allocate io 0x%lx-0x%lx\n", base, base + 8 - 1); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 482 | goto errout_free; |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 483 | } |
| 484 | |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 485 | iface->base = base; |
| 486 | rc = scx200_acb_create(iface); |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 487 | |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 488 | if (rc == 0) |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 489 | return iface; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 490 | |
| 491 | release_region(base, 8); |
| 492 | errout_free: |
| 493 | kfree(iface); |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 494 | return NULL; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 495 | } |
| 496 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 497 | static int scx200_probe(struct platform_device *pdev) |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 498 | { |
| 499 | struct scx200_acb_iface *iface; |
| 500 | struct resource *res; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 501 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 502 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 503 | if (!res) { |
| 504 | dev_err(&pdev->dev, "can't fetch device resource info\n"); |
| 505 | return -ENODEV; |
| 506 | } |
| 507 | |
| 508 | iface = scx200_create_dev("CS5535", res->start, 0, &pdev->dev); |
| 509 | if (!iface) |
| 510 | return -EIO; |
| 511 | |
| 512 | dev_info(&pdev->dev, "SCx200 device '%s' registered\n", |
| 513 | iface->adapter.name); |
| 514 | platform_set_drvdata(pdev, iface); |
| 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 519 | static void scx200_cleanup_iface(struct scx200_acb_iface *iface) |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 520 | { |
| 521 | i2c_del_adapter(&iface->adapter); |
| 522 | release_region(iface->base, 8); |
| 523 | kfree(iface); |
| 524 | } |
| 525 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 526 | static int scx200_remove(struct platform_device *pdev) |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 527 | { |
| 528 | struct scx200_acb_iface *iface; |
| 529 | |
| 530 | iface = platform_get_drvdata(pdev); |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 531 | scx200_cleanup_iface(iface); |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
Harvey Yang | 6fcf84a | 2011-10-30 13:47:25 +0100 | [diff] [blame] | 536 | static struct platform_driver scx200_pci_driver = { |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 537 | .driver = { |
| 538 | .name = "cs5535-smb", |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 539 | }, |
| 540 | .probe = scx200_probe, |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 541 | .remove = scx200_remove, |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 542 | }; |
| 543 | |
Jingoo Han | 392debf | 2013-12-03 08:11:20 +0900 | [diff] [blame] | 544 | static const struct pci_device_id scx200_isa[] = { |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 545 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, |
| 546 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, |
Dzianis Kahanovich | 87acf5a | 2010-10-27 20:33:05 -0600 | [diff] [blame] | 547 | { 0, } |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 548 | }; |
| 549 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 550 | static __init void scx200_scan_isa(void) |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 551 | { |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 552 | int i; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 553 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 554 | if (!pci_dev_present(scx200_isa)) |
| 555 | return; |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 556 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 557 | for (i = 0; i < MAX_DEVICES; ++i) { |
| 558 | if (base[i] == 0) |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 559 | continue; |
| 560 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 561 | /* XXX: should we care about failures? */ |
| 562 | scx200_create_dev("SCx200", base[i], i, NULL); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 563 | } |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 564 | } |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | static int __init scx200_acb_init(void) |
| 567 | { |
Jim Cromie | 401e72b | 2012-10-05 22:23:52 +0200 | [diff] [blame] | 568 | pr_debug("NatSemi SCx200 ACCESS.bus Driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 570 | /* First scan for ISA-based devices */ |
| 571 | scx200_scan_isa(); /* XXX: should we care about errors? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Jean Delvare | 6f9c296 | 2006-04-26 22:50:32 +0200 | [diff] [blame] | 573 | /* If at least one bus was created, init must succeed */ |
| 574 | if (scx200_acb_list) |
| 575 | return 0; |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 576 | |
| 577 | /* No ISA devices; register the platform driver for PCI-based devices */ |
Harvey Yang | 6fcf84a | 2011-10-30 13:47:25 +0100 | [diff] [blame] | 578 | return platform_driver_register(&scx200_pci_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | static void __exit scx200_acb_cleanup(void) |
| 582 | { |
| 583 | struct scx200_acb_iface *iface; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 584 | |
Harvey Yang | 6fcf84a | 2011-10-30 13:47:25 +0100 | [diff] [blame] | 585 | platform_driver_unregister(&scx200_pci_driver); |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 586 | |
Matthias Kaehlcke | 9d9c01c | 2007-07-12 14:12:28 +0200 | [diff] [blame] | 587 | mutex_lock(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | while ((iface = scx200_acb_list) != NULL) { |
| 589 | scx200_acb_list = iface->next; |
Matthias Kaehlcke | 9d9c01c | 2007-07-12 14:12:28 +0200 | [diff] [blame] | 590 | mutex_unlock(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Andres Salomon | de8255c | 2010-12-30 20:27:33 -0800 | [diff] [blame] | 592 | scx200_cleanup_iface(iface); |
Jordan Crouse | 80cd3a8 | 2006-06-12 21:44:28 +0200 | [diff] [blame] | 593 | |
Matthias Kaehlcke | 9d9c01c | 2007-07-12 14:12:28 +0200 | [diff] [blame] | 594 | mutex_lock(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
Matthias Kaehlcke | 9d9c01c | 2007-07-12 14:12:28 +0200 | [diff] [blame] | 596 | mutex_unlock(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | module_init(scx200_acb_init); |
| 600 | module_exit(scx200_acb_cleanup); |