Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IBM Hot Plug Controller Driver |
| 3 | * |
| 4 | * Written By: Jyoti Shah, IBM Corporation |
| 5 | * |
| 6 | * Copyright (C) 2001-2003 IBM Corp. |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 18 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 19 | * 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 | * Send feedback to <gregkh@us.ibm.com> |
| 26 | * <jshah@us.ibm.com> |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/wait.h> |
| 31 | #include <linux/time.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/init.h> |
Ingo Molnar | 6aa4cdd | 2006-01-13 16:02:15 +0100 | [diff] [blame] | 36 | #include <linux/mutex.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 37 | #include <linux/sched.h> |
Randy Dunlap | 939fdc6 | 2010-02-04 12:12:23 -0800 | [diff] [blame] | 38 | #include <linux/semaphore.h> |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 39 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "ibmphp.h" |
| 41 | |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 42 | static int to_debug = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define debug_polling(fmt, arg...) do { if (to_debug) debug (fmt, arg); } while (0) |
| 44 | |
| 45 | //---------------------------------------------------------------------------- |
| 46 | // timeout values |
| 47 | //---------------------------------------------------------------------------- |
| 48 | #define CMD_COMPLETE_TOUT_SEC 60 // give HPC 60 sec to finish cmd |
| 49 | #define HPC_CTLR_WORKING_TOUT 60 // give HPC 60 sec to finish cmd |
| 50 | #define HPC_GETACCESS_TIMEOUT 60 // seconds |
| 51 | #define POLL_INTERVAL_SEC 2 // poll HPC every 2 seconds |
| 52 | #define POLL_LATCH_CNT 5 // poll latch 5 times, then poll slots |
| 53 | |
| 54 | //---------------------------------------------------------------------------- |
| 55 | // Winnipeg Architected Register Offsets |
| 56 | //---------------------------------------------------------------------------- |
| 57 | #define WPG_I2CMBUFL_OFFSET 0x08 // I2C Message Buffer Low |
| 58 | #define WPG_I2CMOSUP_OFFSET 0x10 // I2C Master Operation Setup Reg |
| 59 | #define WPG_I2CMCNTL_OFFSET 0x20 // I2C Master Control Register |
| 60 | #define WPG_I2CPARM_OFFSET 0x40 // I2C Parameter Register |
| 61 | #define WPG_I2CSTAT_OFFSET 0x70 // I2C Status Register |
| 62 | |
| 63 | //---------------------------------------------------------------------------- |
| 64 | // Winnipeg Store Type commands (Add this commands to the register offset) |
| 65 | //---------------------------------------------------------------------------- |
| 66 | #define WPG_I2C_AND 0x1000 // I2C AND operation |
| 67 | #define WPG_I2C_OR 0x2000 // I2C OR operation |
| 68 | |
| 69 | //---------------------------------------------------------------------------- |
Steven Cole | eaae4b3 | 2005-05-03 18:38:30 -0600 | [diff] [blame] | 70 | // Command set for I2C Master Operation Setup Register |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | //---------------------------------------------------------------------------- |
| 72 | #define WPG_READATADDR_MASK 0x00010000 // read,bytes,I2C shifted,index |
| 73 | #define WPG_WRITEATADDR_MASK 0x40010000 // write,bytes,I2C shifted,index |
| 74 | #define WPG_READDIRECT_MASK 0x10010000 |
| 75 | #define WPG_WRITEDIRECT_MASK 0x60010000 |
| 76 | |
| 77 | |
| 78 | //---------------------------------------------------------------------------- |
| 79 | // bit masks for I2C Master Control Register |
| 80 | //---------------------------------------------------------------------------- |
| 81 | #define WPG_I2CMCNTL_STARTOP_MASK 0x00000002 // Start the Operation |
| 82 | |
| 83 | //---------------------------------------------------------------------------- |
| 84 | // |
| 85 | //---------------------------------------------------------------------------- |
| 86 | #define WPG_I2C_IOREMAP_SIZE 0x2044 // size of linear address interval |
| 87 | |
| 88 | //---------------------------------------------------------------------------- |
| 89 | // command index |
| 90 | //---------------------------------------------------------------------------- |
| 91 | #define WPG_1ST_SLOT_INDEX 0x01 // index - 1st slot for ctlr |
| 92 | #define WPG_CTLR_INDEX 0x0F // index - ctlr |
| 93 | #define WPG_1ST_EXTSLOT_INDEX 0x10 // index - 1st ext slot for ctlr |
| 94 | #define WPG_1ST_BUS_INDEX 0x1F // index - 1st bus for ctlr |
| 95 | |
| 96 | //---------------------------------------------------------------------------- |
| 97 | // macro utilities |
| 98 | //---------------------------------------------------------------------------- |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 99 | // if bits 20,22,25,26,27,29,30 are OFF return 1 |
| 100 | #define HPC_I2CSTATUS_CHECK(s) ((u8)((s & 0x00000A76) ? 0 : 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | //---------------------------------------------------------------------------- |
| 103 | // global variables |
| 104 | //---------------------------------------------------------------------------- |
Ingo Molnar | 6aa4cdd | 2006-01-13 16:02:15 +0100 | [diff] [blame] | 105 | static struct mutex sem_hpcaccess; // lock access to HPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static struct semaphore semOperations; // lock all operations and |
| 107 | // access to data structures |
| 108 | static struct semaphore sem_exit; // make sure polling thread goes away |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 109 | static struct task_struct *ibmphp_poll_thread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | //---------------------------------------------------------------------------- |
| 111 | // local function prototypes |
| 112 | //---------------------------------------------------------------------------- |
| 113 | static u8 i2c_ctrl_read (struct controller *, void __iomem *, u8); |
| 114 | static u8 i2c_ctrl_write (struct controller *, void __iomem *, u8, u8); |
| 115 | static u8 hpc_writecmdtoindex (u8, u8); |
| 116 | static u8 hpc_readcmdtoindex (u8, u8); |
| 117 | static void get_hpc_access (void); |
| 118 | static void free_hpc_access (void); |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 119 | static int poll_hpc(void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | static int process_changeinstatus (struct slot *, struct slot *); |
| 121 | static int process_changeinlatch (u8, u8, struct controller *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static int hpc_wait_ctlr_notworking (int, struct controller *, void __iomem *, u8 *); |
| 123 | //---------------------------------------------------------------------------- |
| 124 | |
| 125 | |
| 126 | /*---------------------------------------------------------------------- |
| 127 | * Name: ibmphp_hpc_initvars |
| 128 | * |
| 129 | * Action: initialize semaphores and variables |
| 130 | *---------------------------------------------------------------------*/ |
| 131 | void __init ibmphp_hpc_initvars (void) |
| 132 | { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 133 | debug ("%s - Entry\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Ingo Molnar | 6aa4cdd | 2006-01-13 16:02:15 +0100 | [diff] [blame] | 135 | mutex_init(&sem_hpcaccess); |
Thomas Gleixner | 5a37f13 | 2010-09-07 14:32:38 +0000 | [diff] [blame] | 136 | sema_init(&semOperations, 1); |
| 137 | sema_init(&sem_exit, 0); |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 138 | to_debug = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 140 | debug ("%s - Exit\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | /*---------------------------------------------------------------------- |
| 144 | * Name: i2c_ctrl_read |
| 145 | * |
| 146 | * Action: read from HPC over I2C |
| 147 | * |
| 148 | *---------------------------------------------------------------------*/ |
| 149 | static u8 i2c_ctrl_read (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index) |
| 150 | { |
| 151 | u8 status; |
| 152 | int i; |
| 153 | void __iomem *wpg_addr; // base addr + offset |
| 154 | unsigned long wpg_data; // data to/from WPG LOHI format |
| 155 | unsigned long ultemp; |
| 156 | unsigned long data; // actual data HILO format |
| 157 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 158 | debug_polling ("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | //-------------------------------------------------------------------- |
| 161 | // READ - step 1 |
| 162 | // read at address, byte length, I2C address (shifted), index |
| 163 | // or read direct, byte length, index |
| 164 | if (ctlr_ptr->ctlr_type == 0x02) { |
| 165 | data = WPG_READATADDR_MASK; |
| 166 | // fill in I2C address |
| 167 | ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr; |
| 168 | ultemp = ultemp >> 1; |
| 169 | data |= (ultemp << 8); |
| 170 | |
| 171 | // fill in index |
| 172 | data |= (unsigned long)index; |
| 173 | } else if (ctlr_ptr->ctlr_type == 0x04) { |
| 174 | data = WPG_READDIRECT_MASK; |
| 175 | |
| 176 | // fill in index |
| 177 | ultemp = (unsigned long)index; |
| 178 | ultemp = ultemp << 8; |
| 179 | data |= ultemp; |
| 180 | } else { |
| 181 | err ("this controller type is not supported \n"); |
| 182 | return HPC_ERROR; |
| 183 | } |
| 184 | |
| 185 | wpg_data = swab32 (data); // swap data before writing |
| 186 | wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET; |
| 187 | writel (wpg_data, wpg_addr); |
| 188 | |
| 189 | //-------------------------------------------------------------------- |
| 190 | // READ - step 2 : clear the message buffer |
| 191 | data = 0x00000000; |
| 192 | wpg_data = swab32 (data); |
| 193 | wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; |
| 194 | writel (wpg_data, wpg_addr); |
| 195 | |
| 196 | //-------------------------------------------------------------------- |
| 197 | // READ - step 3 : issue start operation, I2C master control bit 30:ON |
| 198 | // 2020 : [20] OR operation at [20] offset 0x20 |
| 199 | data = WPG_I2CMCNTL_STARTOP_MASK; |
| 200 | wpg_data = swab32 (data); |
| 201 | wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR; |
| 202 | writel (wpg_data, wpg_addr); |
| 203 | |
| 204 | //-------------------------------------------------------------------- |
| 205 | // READ - step 4 : wait until start operation bit clears |
| 206 | i = CMD_COMPLETE_TOUT_SEC; |
| 207 | while (i) { |
| 208 | msleep(10); |
| 209 | wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET; |
| 210 | wpg_data = readl (wpg_addr); |
| 211 | data = swab32 (wpg_data); |
| 212 | if (!(data & WPG_I2CMCNTL_STARTOP_MASK)) |
| 213 | break; |
| 214 | i--; |
| 215 | } |
| 216 | if (i == 0) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 217 | debug ("%s - Error : WPG timeout\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return HPC_ERROR; |
| 219 | } |
| 220 | //-------------------------------------------------------------------- |
| 221 | // READ - step 5 : read I2C status register |
| 222 | i = CMD_COMPLETE_TOUT_SEC; |
| 223 | while (i) { |
| 224 | msleep(10); |
| 225 | wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET; |
| 226 | wpg_data = readl (wpg_addr); |
| 227 | data = swab32 (wpg_data); |
| 228 | if (HPC_I2CSTATUS_CHECK (data)) |
| 229 | break; |
| 230 | i--; |
| 231 | } |
| 232 | if (i == 0) { |
| 233 | debug ("ctrl_read - Exit Error:I2C timeout\n"); |
| 234 | return HPC_ERROR; |
| 235 | } |
| 236 | |
| 237 | //-------------------------------------------------------------------- |
| 238 | // READ - step 6 : get DATA |
| 239 | wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; |
| 240 | wpg_data = readl (wpg_addr); |
| 241 | data = swab32 (wpg_data); |
| 242 | |
| 243 | status = (u8) data; |
| 244 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 245 | debug_polling ("%s - Exit index[%x] status[%x]\n", __func__, index, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | return (status); |
| 248 | } |
| 249 | |
| 250 | /*---------------------------------------------------------------------- |
| 251 | * Name: i2c_ctrl_write |
| 252 | * |
| 253 | * Action: write to HPC over I2C |
| 254 | * |
| 255 | * Return 0 or error codes |
| 256 | *---------------------------------------------------------------------*/ |
| 257 | static u8 i2c_ctrl_write (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index, u8 cmd) |
| 258 | { |
| 259 | u8 rc; |
| 260 | void __iomem *wpg_addr; // base addr + offset |
| 261 | unsigned long wpg_data; // data to/from WPG LOHI format |
| 262 | unsigned long ultemp; |
| 263 | unsigned long data; // actual data HILO format |
| 264 | int i; |
| 265 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 266 | debug_polling ("%s - Entry WPGBbar[%p] index[%x] cmd[%x]\n", __func__, WPGBbar, index, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | rc = 0; |
| 269 | //-------------------------------------------------------------------- |
| 270 | // WRITE - step 1 |
| 271 | // write at address, byte length, I2C address (shifted), index |
| 272 | // or write direct, byte length, index |
| 273 | data = 0x00000000; |
| 274 | |
| 275 | if (ctlr_ptr->ctlr_type == 0x02) { |
| 276 | data = WPG_WRITEATADDR_MASK; |
| 277 | // fill in I2C address |
| 278 | ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr; |
| 279 | ultemp = ultemp >> 1; |
| 280 | data |= (ultemp << 8); |
| 281 | |
| 282 | // fill in index |
| 283 | data |= (unsigned long)index; |
| 284 | } else if (ctlr_ptr->ctlr_type == 0x04) { |
| 285 | data = WPG_WRITEDIRECT_MASK; |
| 286 | |
| 287 | // fill in index |
| 288 | ultemp = (unsigned long)index; |
| 289 | ultemp = ultemp << 8; |
| 290 | data |= ultemp; |
| 291 | } else { |
| 292 | err ("this controller type is not supported \n"); |
| 293 | return HPC_ERROR; |
| 294 | } |
| 295 | |
| 296 | wpg_data = swab32 (data); // swap data before writing |
| 297 | wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET; |
| 298 | writel (wpg_data, wpg_addr); |
| 299 | |
| 300 | //-------------------------------------------------------------------- |
| 301 | // WRITE - step 2 : clear the message buffer |
| 302 | data = 0x00000000 | (unsigned long)cmd; |
| 303 | wpg_data = swab32 (data); |
| 304 | wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET; |
| 305 | writel (wpg_data, wpg_addr); |
| 306 | |
| 307 | //-------------------------------------------------------------------- |
| 308 | // WRITE - step 3 : issue start operation,I2C master control bit 30:ON |
| 309 | // 2020 : [20] OR operation at [20] offset 0x20 |
| 310 | data = WPG_I2CMCNTL_STARTOP_MASK; |
| 311 | wpg_data = swab32 (data); |
| 312 | wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR; |
| 313 | writel (wpg_data, wpg_addr); |
| 314 | |
| 315 | //-------------------------------------------------------------------- |
| 316 | // WRITE - step 4 : wait until start operation bit clears |
| 317 | i = CMD_COMPLETE_TOUT_SEC; |
| 318 | while (i) { |
| 319 | msleep(10); |
| 320 | wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET; |
| 321 | wpg_data = readl (wpg_addr); |
| 322 | data = swab32 (wpg_data); |
| 323 | if (!(data & WPG_I2CMCNTL_STARTOP_MASK)) |
| 324 | break; |
| 325 | i--; |
| 326 | } |
| 327 | if (i == 0) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 328 | debug ("%s - Exit Error:WPG timeout\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | rc = HPC_ERROR; |
| 330 | } |
| 331 | |
| 332 | //-------------------------------------------------------------------- |
| 333 | // WRITE - step 5 : read I2C status register |
| 334 | i = CMD_COMPLETE_TOUT_SEC; |
| 335 | while (i) { |
| 336 | msleep(10); |
| 337 | wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET; |
| 338 | wpg_data = readl (wpg_addr); |
| 339 | data = swab32 (wpg_data); |
| 340 | if (HPC_I2CSTATUS_CHECK (data)) |
| 341 | break; |
| 342 | i--; |
| 343 | } |
| 344 | if (i == 0) { |
| 345 | debug ("ctrl_read - Error : I2C timeout\n"); |
| 346 | rc = HPC_ERROR; |
| 347 | } |
| 348 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 349 | debug_polling ("%s Exit rc[%x]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | return (rc); |
| 351 | } |
| 352 | |
| 353 | //------------------------------------------------------------ |
| 354 | // Read from ISA type HPC |
| 355 | //------------------------------------------------------------ |
| 356 | static u8 isa_ctrl_read (struct controller *ctlr_ptr, u8 offset) |
| 357 | { |
| 358 | u16 start_address; |
| 359 | u16 end_address; |
| 360 | u8 data; |
| 361 | |
| 362 | start_address = ctlr_ptr->u.isa_ctlr.io_start; |
| 363 | end_address = ctlr_ptr->u.isa_ctlr.io_end; |
| 364 | data = inb (start_address + offset); |
| 365 | return data; |
| 366 | } |
| 367 | |
| 368 | //-------------------------------------------------------------- |
| 369 | // Write to ISA type HPC |
| 370 | //-------------------------------------------------------------- |
| 371 | static void isa_ctrl_write (struct controller *ctlr_ptr, u8 offset, u8 data) |
| 372 | { |
| 373 | u16 start_address; |
| 374 | u16 port_address; |
| 375 | |
| 376 | start_address = ctlr_ptr->u.isa_ctlr.io_start; |
| 377 | port_address = start_address + (u16) offset; |
| 378 | outb (data, port_address); |
| 379 | } |
| 380 | |
| 381 | static u8 pci_ctrl_read (struct controller *ctrl, u8 offset) |
| 382 | { |
| 383 | u8 data = 0x00; |
| 384 | debug ("inside pci_ctrl_read\n"); |
| 385 | if (ctrl->ctrl_dev) |
| 386 | pci_read_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, &data); |
| 387 | return data; |
| 388 | } |
| 389 | |
| 390 | static u8 pci_ctrl_write (struct controller *ctrl, u8 offset, u8 data) |
| 391 | { |
| 392 | u8 rc = -ENODEV; |
| 393 | debug ("inside pci_ctrl_write\n"); |
| 394 | if (ctrl->ctrl_dev) { |
| 395 | pci_write_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, data); |
| 396 | rc = 0; |
| 397 | } |
| 398 | return rc; |
| 399 | } |
| 400 | |
| 401 | static u8 ctrl_read (struct controller *ctlr, void __iomem *base, u8 offset) |
| 402 | { |
| 403 | u8 rc; |
| 404 | switch (ctlr->ctlr_type) { |
| 405 | case 0: |
| 406 | rc = isa_ctrl_read (ctlr, offset); |
| 407 | break; |
| 408 | case 1: |
| 409 | rc = pci_ctrl_read (ctlr, offset); |
| 410 | break; |
| 411 | case 2: |
| 412 | case 4: |
| 413 | rc = i2c_ctrl_read (ctlr, base, offset); |
| 414 | break; |
| 415 | default: |
| 416 | return -ENODEV; |
| 417 | } |
| 418 | return rc; |
| 419 | } |
| 420 | |
| 421 | static u8 ctrl_write (struct controller *ctlr, void __iomem *base, u8 offset, u8 data) |
| 422 | { |
| 423 | u8 rc = 0; |
| 424 | switch (ctlr->ctlr_type) { |
| 425 | case 0: |
| 426 | isa_ctrl_write(ctlr, offset, data); |
| 427 | break; |
| 428 | case 1: |
| 429 | rc = pci_ctrl_write (ctlr, offset, data); |
| 430 | break; |
| 431 | case 2: |
| 432 | case 4: |
| 433 | rc = i2c_ctrl_write(ctlr, base, offset, data); |
| 434 | break; |
| 435 | default: |
| 436 | return -ENODEV; |
| 437 | } |
| 438 | return rc; |
| 439 | } |
| 440 | /*---------------------------------------------------------------------- |
| 441 | * Name: hpc_writecmdtoindex() |
| 442 | * |
| 443 | * Action: convert a write command to proper index within a controller |
| 444 | * |
| 445 | * Return index, HPC_ERROR |
| 446 | *---------------------------------------------------------------------*/ |
| 447 | static u8 hpc_writecmdtoindex (u8 cmd, u8 index) |
| 448 | { |
| 449 | u8 rc; |
| 450 | |
| 451 | switch (cmd) { |
| 452 | case HPC_CTLR_ENABLEIRQ: // 0x00.N.15 |
| 453 | case HPC_CTLR_CLEARIRQ: // 0x06.N.15 |
| 454 | case HPC_CTLR_RESET: // 0x07.N.15 |
| 455 | case HPC_CTLR_IRQSTEER: // 0x08.N.15 |
| 456 | case HPC_CTLR_DISABLEIRQ: // 0x01.N.15 |
| 457 | case HPC_ALLSLOT_ON: // 0x11.N.15 |
| 458 | case HPC_ALLSLOT_OFF: // 0x12.N.15 |
| 459 | rc = 0x0F; |
| 460 | break; |
| 461 | |
| 462 | case HPC_SLOT_OFF: // 0x02.Y.0-14 |
| 463 | case HPC_SLOT_ON: // 0x03.Y.0-14 |
| 464 | case HPC_SLOT_ATTNOFF: // 0x04.N.0-14 |
| 465 | case HPC_SLOT_ATTNON: // 0x05.N.0-14 |
| 466 | case HPC_SLOT_BLINKLED: // 0x13.N.0-14 |
| 467 | rc = index; |
| 468 | break; |
| 469 | |
| 470 | case HPC_BUS_33CONVMODE: |
| 471 | case HPC_BUS_66CONVMODE: |
| 472 | case HPC_BUS_66PCIXMODE: |
| 473 | case HPC_BUS_100PCIXMODE: |
| 474 | case HPC_BUS_133PCIXMODE: |
| 475 | rc = index + WPG_1ST_BUS_INDEX - 1; |
| 476 | break; |
| 477 | |
| 478 | default: |
| 479 | err ("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd); |
| 480 | rc = HPC_ERROR; |
| 481 | } |
| 482 | |
| 483 | return rc; |
| 484 | } |
| 485 | |
| 486 | /*---------------------------------------------------------------------- |
| 487 | * Name: hpc_readcmdtoindex() |
| 488 | * |
| 489 | * Action: convert a read command to proper index within a controller |
| 490 | * |
| 491 | * Return index, HPC_ERROR |
| 492 | *---------------------------------------------------------------------*/ |
| 493 | static u8 hpc_readcmdtoindex (u8 cmd, u8 index) |
| 494 | { |
| 495 | u8 rc; |
| 496 | |
| 497 | switch (cmd) { |
| 498 | case READ_CTLRSTATUS: |
| 499 | rc = 0x0F; |
| 500 | break; |
| 501 | case READ_SLOTSTATUS: |
| 502 | case READ_ALLSTAT: |
| 503 | rc = index; |
| 504 | break; |
| 505 | case READ_EXTSLOTSTATUS: |
| 506 | rc = index + WPG_1ST_EXTSLOT_INDEX; |
| 507 | break; |
| 508 | case READ_BUSSTATUS: |
| 509 | rc = index + WPG_1ST_BUS_INDEX - 1; |
| 510 | break; |
| 511 | case READ_SLOTLATCHLOWREG: |
| 512 | rc = 0x28; |
| 513 | break; |
| 514 | case READ_REVLEVEL: |
| 515 | rc = 0x25; |
| 516 | break; |
| 517 | case READ_HPCOPTIONS: |
| 518 | rc = 0x27; |
| 519 | break; |
| 520 | default: |
| 521 | rc = HPC_ERROR; |
| 522 | } |
| 523 | return rc; |
| 524 | } |
| 525 | |
| 526 | /*---------------------------------------------------------------------- |
| 527 | * Name: HPCreadslot() |
| 528 | * |
| 529 | * Action: issue a READ command to HPC |
| 530 | * |
Matt LaPlante | 0779bf2 | 2006-11-30 05:24:39 +0100 | [diff] [blame] | 531 | * Input: pslot - cannot be NULL for READ_ALLSTAT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | * pstatus - can be NULL for READ_ALLSTAT |
| 533 | * |
| 534 | * Return 0 or error codes |
| 535 | *---------------------------------------------------------------------*/ |
| 536 | int ibmphp_hpc_readslot (struct slot * pslot, u8 cmd, u8 * pstatus) |
| 537 | { |
| 538 | void __iomem *wpg_bbar = NULL; |
| 539 | struct controller *ctlr_ptr; |
| 540 | struct list_head *pslotlist; |
| 541 | u8 index, status; |
| 542 | int rc = 0; |
| 543 | int busindex; |
| 544 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 545 | debug_polling ("%s - Entry pslot[%p] cmd[%x] pstatus[%p]\n", __func__, pslot, cmd, pstatus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | if ((pslot == NULL) |
| 548 | || ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) { |
| 549 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 550 | err ("%s - Error invalid pointer, rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return rc; |
| 552 | } |
| 553 | |
| 554 | if (cmd == READ_BUSSTATUS) { |
| 555 | busindex = ibmphp_get_bus_index (pslot->bus); |
| 556 | if (busindex < 0) { |
| 557 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 558 | err ("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | return rc; |
| 560 | } else |
| 561 | index = (u8) busindex; |
| 562 | } else |
| 563 | index = pslot->ctlr_index; |
| 564 | |
| 565 | index = hpc_readcmdtoindex (cmd, index); |
| 566 | |
| 567 | if (index == HPC_ERROR) { |
| 568 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 569 | err ("%s - Exit Error:invalid index, rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | return rc; |
| 571 | } |
| 572 | |
| 573 | ctlr_ptr = pslot->ctrl; |
| 574 | |
| 575 | get_hpc_access (); |
| 576 | |
| 577 | //-------------------------------------------------------------------- |
| 578 | // map physical address to logical address |
| 579 | //-------------------------------------------------------------------- |
| 580 | if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) |
| 581 | wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE); |
| 582 | |
| 583 | //-------------------------------------------------------------------- |
| 584 | // check controller status before reading |
| 585 | //-------------------------------------------------------------------- |
| 586 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status); |
| 587 | if (!rc) { |
| 588 | switch (cmd) { |
| 589 | case READ_ALLSTAT: |
| 590 | // update the slot structure |
| 591 | pslot->ctrl->status = status; |
| 592 | pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 593 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, |
| 594 | &status); |
| 595 | if (!rc) |
| 596 | pslot->ext_status = ctrl_read (ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX); |
| 597 | |
| 598 | break; |
| 599 | |
| 600 | case READ_SLOTSTATUS: |
| 601 | // DO NOT update the slot structure |
| 602 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 603 | break; |
| 604 | |
| 605 | case READ_EXTSLOTSTATUS: |
| 606 | // DO NOT update the slot structure |
| 607 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 608 | break; |
| 609 | |
| 610 | case READ_CTLRSTATUS: |
| 611 | // DO NOT update the slot structure |
| 612 | *pstatus = status; |
| 613 | break; |
| 614 | |
| 615 | case READ_BUSSTATUS: |
| 616 | pslot->busstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 617 | break; |
| 618 | case READ_REVLEVEL: |
| 619 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 620 | break; |
| 621 | case READ_HPCOPTIONS: |
| 622 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 623 | break; |
| 624 | case READ_SLOTLATCHLOWREG: |
| 625 | // DO NOT update the slot structure |
| 626 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 627 | break; |
| 628 | |
| 629 | // Not used |
| 630 | case READ_ALLSLOT: |
| 631 | list_for_each (pslotlist, &ibmphp_slot_head) { |
| 632 | pslot = list_entry (pslotlist, struct slot, ibm_slot_list); |
| 633 | index = pslot->ctlr_index; |
| 634 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, |
| 635 | wpg_bbar, &status); |
| 636 | if (!rc) { |
| 637 | pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index); |
| 638 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, |
| 639 | ctlr_ptr, wpg_bbar, &status); |
| 640 | if (!rc) |
| 641 | pslot->ext_status = |
| 642 | ctrl_read (ctlr_ptr, wpg_bbar, |
| 643 | index + WPG_1ST_EXTSLOT_INDEX); |
| 644 | } else { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 645 | err ("%s - Error ctrl_read failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | rc = -EINVAL; |
| 647 | break; |
| 648 | } |
| 649 | } |
| 650 | break; |
| 651 | default: |
| 652 | rc = -EINVAL; |
| 653 | break; |
| 654 | } |
| 655 | } |
| 656 | //-------------------------------------------------------------------- |
| 657 | // cleanup |
| 658 | //-------------------------------------------------------------------- |
| 659 | |
| 660 | // remove physical to logical address mapping |
| 661 | if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) |
| 662 | iounmap (wpg_bbar); |
| 663 | |
| 664 | free_hpc_access (); |
| 665 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 666 | debug_polling ("%s - Exit rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return rc; |
| 668 | } |
| 669 | |
| 670 | /*---------------------------------------------------------------------- |
| 671 | * Name: ibmphp_hpc_writeslot() |
| 672 | * |
| 673 | * Action: issue a WRITE command to HPC |
| 674 | *---------------------------------------------------------------------*/ |
| 675 | int ibmphp_hpc_writeslot (struct slot * pslot, u8 cmd) |
| 676 | { |
| 677 | void __iomem *wpg_bbar = NULL; |
| 678 | struct controller *ctlr_ptr; |
| 679 | u8 index, status; |
| 680 | int busindex; |
| 681 | u8 done; |
| 682 | int rc = 0; |
| 683 | int timeout; |
| 684 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 685 | debug_polling ("%s - Entry pslot[%p] cmd[%x]\n", __func__, pslot, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | if (pslot == NULL) { |
| 687 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 688 | err ("%s - Error Exit rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | return rc; |
| 690 | } |
| 691 | |
| 692 | if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) || |
| 693 | (cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) || |
| 694 | (cmd == HPC_BUS_133PCIXMODE)) { |
| 695 | busindex = ibmphp_get_bus_index (pslot->bus); |
| 696 | if (busindex < 0) { |
| 697 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 698 | err ("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | return rc; |
| 700 | } else |
| 701 | index = (u8) busindex; |
| 702 | } else |
| 703 | index = pslot->ctlr_index; |
| 704 | |
| 705 | index = hpc_writecmdtoindex (cmd, index); |
| 706 | |
| 707 | if (index == HPC_ERROR) { |
| 708 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 709 | err ("%s - Error Exit rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | return rc; |
| 711 | } |
| 712 | |
| 713 | ctlr_ptr = pslot->ctrl; |
| 714 | |
| 715 | get_hpc_access (); |
| 716 | |
| 717 | //-------------------------------------------------------------------- |
| 718 | // map physical address to logical address |
| 719 | //-------------------------------------------------------------------- |
| 720 | if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) { |
| 721 | wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE); |
| 722 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 723 | debug ("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar, |
| 725 | ctlr_ptr->u.wpeg_ctlr.i2c_addr); |
| 726 | } |
| 727 | //-------------------------------------------------------------------- |
| 728 | // check controller status before writing |
| 729 | //-------------------------------------------------------------------- |
| 730 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status); |
| 731 | if (!rc) { |
| 732 | |
| 733 | ctrl_write (ctlr_ptr, wpg_bbar, index, cmd); |
| 734 | |
| 735 | //-------------------------------------------------------------------- |
| 736 | // check controller is still not working on the command |
| 737 | //-------------------------------------------------------------------- |
| 738 | timeout = CMD_COMPLETE_TOUT_SEC; |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 739 | done = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | while (!done) { |
| 741 | rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, |
| 742 | &status); |
| 743 | if (!rc) { |
| 744 | if (NEEDTOCHECK_CMDSTATUS (cmd)) { |
| 745 | if (CTLR_FINISHED (status) == HPC_CTLR_FINISHED_YES) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 746 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } else |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 748 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | if (!done) { |
| 751 | msleep(1000); |
| 752 | if (timeout < 1) { |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 753 | done = 1; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 754 | err ("%s - Error command complete timeout\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | rc = -EFAULT; |
| 756 | } else |
| 757 | timeout--; |
| 758 | } |
| 759 | } |
| 760 | ctlr_ptr->status = status; |
| 761 | } |
| 762 | // cleanup |
| 763 | |
| 764 | // remove physical to logical address mapping |
| 765 | if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) |
| 766 | iounmap (wpg_bbar); |
| 767 | free_hpc_access (); |
| 768 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 769 | debug_polling ("%s - Exit rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | return rc; |
| 771 | } |
| 772 | |
| 773 | /*---------------------------------------------------------------------- |
| 774 | * Name: get_hpc_access() |
| 775 | * |
| 776 | * Action: make sure only one process can access HPC at one time |
| 777 | *---------------------------------------------------------------------*/ |
| 778 | static void get_hpc_access (void) |
| 779 | { |
Ingo Molnar | 6aa4cdd | 2006-01-13 16:02:15 +0100 | [diff] [blame] | 780 | mutex_lock(&sem_hpcaccess); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | /*---------------------------------------------------------------------- |
| 784 | * Name: free_hpc_access() |
| 785 | *---------------------------------------------------------------------*/ |
| 786 | void free_hpc_access (void) |
| 787 | { |
Ingo Molnar | 6aa4cdd | 2006-01-13 16:02:15 +0100 | [diff] [blame] | 788 | mutex_unlock(&sem_hpcaccess); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | /*---------------------------------------------------------------------- |
| 792 | * Name: ibmphp_lock_operations() |
| 793 | * |
| 794 | * Action: make sure only one process can change the data structure |
| 795 | *---------------------------------------------------------------------*/ |
| 796 | void ibmphp_lock_operations (void) |
| 797 | { |
| 798 | down (&semOperations); |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 799 | to_debug = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | /*---------------------------------------------------------------------- |
| 803 | * Name: ibmphp_unlock_operations() |
| 804 | *---------------------------------------------------------------------*/ |
| 805 | void ibmphp_unlock_operations (void) |
| 806 | { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 807 | debug ("%s - Entry\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | up (&semOperations); |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 809 | to_debug = 0; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 810 | debug ("%s - Exit\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | /*---------------------------------------------------------------------- |
| 814 | * Name: poll_hpc() |
| 815 | *---------------------------------------------------------------------*/ |
| 816 | #define POLL_LATCH_REGISTER 0 |
| 817 | #define POLL_SLOTS 1 |
| 818 | #define POLL_SLEEP 2 |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 819 | static int poll_hpc(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | { |
| 821 | struct slot myslot; |
| 822 | struct slot *pslot = NULL; |
| 823 | struct list_head *pslotlist; |
| 824 | int rc; |
| 825 | int poll_state = POLL_LATCH_REGISTER; |
| 826 | u8 oldlatchlow = 0x00; |
| 827 | u8 curlatchlow = 0x00; |
| 828 | int poll_count = 0; |
| 829 | u8 ctrl_count = 0x00; |
| 830 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 831 | debug ("%s - Entry\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 833 | while (!kthread_should_stop()) { |
Steven Cole | eaae4b3 | 2005-05-03 18:38:30 -0600 | [diff] [blame] | 834 | /* try to get the lock to do some kind of hardware access */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | down (&semOperations); |
| 836 | |
| 837 | switch (poll_state) { |
| 838 | case POLL_LATCH_REGISTER: |
| 839 | oldlatchlow = curlatchlow; |
| 840 | ctrl_count = 0x00; |
| 841 | list_for_each (pslotlist, &ibmphp_slot_head) { |
| 842 | if (ctrl_count >= ibmphp_get_total_controllers()) |
| 843 | break; |
| 844 | pslot = list_entry (pslotlist, struct slot, ibm_slot_list); |
| 845 | if (pslot->ctrl->ctlr_relative_id == ctrl_count) { |
| 846 | ctrl_count++; |
| 847 | if (READ_SLOT_LATCH (pslot->ctrl)) { |
| 848 | rc = ibmphp_hpc_readslot (pslot, |
| 849 | READ_SLOTLATCHLOWREG, |
| 850 | &curlatchlow); |
| 851 | if (oldlatchlow != curlatchlow) |
| 852 | process_changeinlatch (oldlatchlow, |
| 853 | curlatchlow, |
| 854 | pslot->ctrl); |
| 855 | } |
| 856 | } |
| 857 | } |
| 858 | ++poll_count; |
| 859 | poll_state = POLL_SLEEP; |
| 860 | break; |
| 861 | case POLL_SLOTS: |
| 862 | list_for_each (pslotlist, &ibmphp_slot_head) { |
| 863 | pslot = list_entry (pslotlist, struct slot, ibm_slot_list); |
| 864 | // make a copy of the old status |
| 865 | memcpy ((void *) &myslot, (void *) pslot, |
| 866 | sizeof (struct slot)); |
| 867 | rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL); |
| 868 | if ((myslot.status != pslot->status) |
| 869 | || (myslot.ext_status != pslot->ext_status)) |
| 870 | process_changeinstatus (pslot, &myslot); |
| 871 | } |
| 872 | ctrl_count = 0x00; |
| 873 | list_for_each (pslotlist, &ibmphp_slot_head) { |
| 874 | if (ctrl_count >= ibmphp_get_total_controllers()) |
| 875 | break; |
| 876 | pslot = list_entry (pslotlist, struct slot, ibm_slot_list); |
| 877 | if (pslot->ctrl->ctlr_relative_id == ctrl_count) { |
| 878 | ctrl_count++; |
| 879 | if (READ_SLOT_LATCH (pslot->ctrl)) |
| 880 | rc = ibmphp_hpc_readslot (pslot, |
| 881 | READ_SLOTLATCHLOWREG, |
| 882 | &curlatchlow); |
| 883 | } |
| 884 | } |
| 885 | ++poll_count; |
| 886 | poll_state = POLL_SLEEP; |
| 887 | break; |
| 888 | case POLL_SLEEP: |
| 889 | /* don't sleep with a lock on the hardware */ |
| 890 | up (&semOperations); |
| 891 | msleep(POLL_INTERVAL_SEC * 1000); |
| 892 | |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 893 | if (kthread_should_stop()) |
Jesse Barnes | 5c788a6 | 2009-12-04 15:18:01 -0800 | [diff] [blame] | 894 | goto out_sleep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | down (&semOperations); |
| 897 | |
| 898 | if (poll_count >= POLL_LATCH_CNT) { |
| 899 | poll_count = 0; |
| 900 | poll_state = POLL_SLOTS; |
| 901 | } else |
| 902 | poll_state = POLL_LATCH_REGISTER; |
| 903 | break; |
| 904 | } |
Steven Cole | eaae4b3 | 2005-05-03 18:38:30 -0600 | [diff] [blame] | 905 | /* give up the hardware semaphore */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | up (&semOperations); |
| 907 | /* sleep for a short time just for good measure */ |
Jesse Barnes | 5c788a6 | 2009-12-04 15:18:01 -0800 | [diff] [blame] | 908 | out_sleep: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | msleep(100); |
| 910 | } |
| 911 | up (&sem_exit); |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 912 | debug ("%s - Exit\n", __func__); |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 913 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | |
| 916 | |
| 917 | /*---------------------------------------------------------------------- |
| 918 | * Name: process_changeinstatus |
| 919 | * |
| 920 | * Action: compare old and new slot status, process the change in status |
| 921 | * |
| 922 | * Input: pointer to slot struct, old slot struct |
| 923 | * |
| 924 | * Return 0 or error codes |
| 925 | * Value: |
| 926 | * |
| 927 | * Side |
| 928 | * Effects: None. |
| 929 | * |
| 930 | * Notes: |
| 931 | *---------------------------------------------------------------------*/ |
| 932 | static int process_changeinstatus (struct slot *pslot, struct slot *poldslot) |
| 933 | { |
| 934 | u8 status; |
| 935 | int rc = 0; |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 936 | u8 disable = 0; |
| 937 | u8 update = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
| 939 | debug ("process_changeinstatus - Entry pslot[%p], poldslot[%p]\n", pslot, poldslot); |
| 940 | |
| 941 | // bit 0 - HPC_SLOT_POWER |
| 942 | if ((pslot->status & 0x01) != (poldslot->status & 0x01)) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 943 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
| 945 | // bit 1 - HPC_SLOT_CONNECT |
| 946 | // ignore |
| 947 | |
| 948 | // bit 2 - HPC_SLOT_ATTN |
| 949 | if ((pslot->status & 0x04) != (poldslot->status & 0x04)) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 950 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
| 952 | // bit 3 - HPC_SLOT_PRSNT2 |
| 953 | // bit 4 - HPC_SLOT_PRSNT1 |
| 954 | if (((pslot->status & 0x08) != (poldslot->status & 0x08)) |
| 955 | || ((pslot->status & 0x10) != (poldslot->status & 0x10))) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 956 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
| 958 | // bit 5 - HPC_SLOT_PWRGD |
| 959 | if ((pslot->status & 0x20) != (poldslot->status & 0x20)) |
| 960 | // OFF -> ON: ignore, ON -> OFF: disable slot |
| 961 | if ((poldslot->status & 0x20) && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status))) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 962 | disable = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | // bit 6 - HPC_SLOT_BUS_SPEED |
| 965 | // ignore |
| 966 | |
| 967 | // bit 7 - HPC_SLOT_LATCH |
| 968 | if ((pslot->status & 0x80) != (poldslot->status & 0x80)) { |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 969 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | // OPEN -> CLOSE |
| 971 | if (pslot->status & 0x80) { |
| 972 | if (SLOT_PWRGD (pslot->status)) { |
| 973 | // power goes on and off after closing latch |
| 974 | // check again to make sure power is still ON |
| 975 | msleep(1000); |
| 976 | rc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &status); |
| 977 | if (SLOT_PWRGD (status)) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 978 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | else // overwrite power in pslot to OFF |
| 980 | pslot->status &= ~HPC_SLOT_POWER; |
| 981 | } |
| 982 | } |
| 983 | // CLOSE -> OPEN |
| 984 | else if ((SLOT_PWRGD (poldslot->status) == HPC_SLOT_PWRGD_GOOD) |
| 985 | && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status))) { |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 986 | disable = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | // else - ignore |
| 989 | } |
| 990 | // bit 4 - HPC_SLOT_BLINK_ATTN |
| 991 | if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08)) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 992 | update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
| 994 | if (disable) { |
| 995 | debug ("process_changeinstatus - disable slot\n"); |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 996 | pslot->flag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | rc = ibmphp_do_disable_slot (pslot); |
| 998 | } |
| 999 | |
| 1000 | if (update || disable) { |
| 1001 | ibmphp_update_slot_info (pslot); |
| 1002 | } |
| 1003 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1004 | debug ("%s - Exit rc[%d] disable[%x] update[%x]\n", __func__, rc, disable, update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
| 1006 | return rc; |
| 1007 | } |
| 1008 | |
| 1009 | /*---------------------------------------------------------------------- |
| 1010 | * Name: process_changeinlatch |
| 1011 | * |
| 1012 | * Action: compare old and new latch reg status, process the change |
| 1013 | * |
| 1014 | * Input: old and current latch register status |
| 1015 | * |
| 1016 | * Return 0 or error codes |
| 1017 | * Value: |
| 1018 | *---------------------------------------------------------------------*/ |
| 1019 | static int process_changeinlatch (u8 old, u8 new, struct controller *ctrl) |
| 1020 | { |
| 1021 | struct slot myslot, *pslot; |
| 1022 | u8 i; |
| 1023 | u8 mask; |
| 1024 | int rc = 0; |
| 1025 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1026 | debug ("%s - Entry old[%x], new[%x]\n", __func__, old, new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | // bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots |
| 1028 | |
| 1029 | for (i = ctrl->starting_slot_num; i <= ctrl->ending_slot_num; i++) { |
| 1030 | mask = 0x01 << i; |
| 1031 | if ((mask & old) != (mask & new)) { |
| 1032 | pslot = ibmphp_get_slot_from_physical_num (i); |
| 1033 | if (pslot) { |
| 1034 | memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot)); |
| 1035 | rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL); |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1036 | debug ("%s - call process_changeinstatus for slot[%d]\n", __func__, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | process_changeinstatus (pslot, &myslot); |
| 1038 | } else { |
| 1039 | rc = -EINVAL; |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1040 | err ("%s - Error bad pointer for slot[%d]\n", __func__, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | } |
| 1042 | } |
| 1043 | } |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1044 | debug ("%s - Exit rc[%d]\n", __func__, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | return rc; |
| 1046 | } |
| 1047 | |
| 1048 | /*---------------------------------------------------------------------- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | * Name: ibmphp_hpc_start_poll_thread |
| 1050 | * |
| 1051 | * Action: start polling thread |
| 1052 | *---------------------------------------------------------------------*/ |
| 1053 | int __init ibmphp_hpc_start_poll_thread (void) |
| 1054 | { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1055 | debug ("%s - Entry\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 1057 | ibmphp_poll_thread = kthread_run(poll_hpc, NULL, "hpc_poll"); |
| 1058 | if (IS_ERR(ibmphp_poll_thread)) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1059 | err ("%s - Error, thread not started\n", __func__); |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 1060 | return PTR_ERR(ibmphp_poll_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | } |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 1062 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | /*---------------------------------------------------------------------- |
| 1066 | * Name: ibmphp_hpc_stop_poll_thread |
| 1067 | * |
| 1068 | * Action: stop polling thread and cleanup |
| 1069 | *---------------------------------------------------------------------*/ |
| 1070 | void __exit ibmphp_hpc_stop_poll_thread (void) |
| 1071 | { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1072 | debug ("%s - Entry\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Kristen Carlson Accardi | 2d100fe | 2007-08-14 16:07:00 -0700 | [diff] [blame] | 1074 | kthread_stop(ibmphp_poll_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | debug ("before locking operations \n"); |
| 1076 | ibmphp_lock_operations (); |
| 1077 | debug ("after locking operations \n"); |
| 1078 | |
| 1079 | // wait for poll thread to exit |
| 1080 | debug ("before sem_exit down \n"); |
| 1081 | down (&sem_exit); |
| 1082 | debug ("after sem_exit down \n"); |
| 1083 | |
| 1084 | // cleanup |
| 1085 | debug ("before free_hpc_access \n"); |
| 1086 | free_hpc_access (); |
| 1087 | debug ("after free_hpc_access \n"); |
| 1088 | ibmphp_unlock_operations (); |
| 1089 | debug ("after unlock operations \n"); |
| 1090 | up (&sem_exit); |
| 1091 | debug ("after sem exit up\n"); |
| 1092 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 1093 | debug ("%s - Exit\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
| 1095 | |
| 1096 | /*---------------------------------------------------------------------- |
| 1097 | * Name: hpc_wait_ctlr_notworking |
| 1098 | * |
| 1099 | * Action: wait until the controller is in a not working state |
| 1100 | * |
| 1101 | * Return 0, HPC_ERROR |
| 1102 | * Value: |
| 1103 | *---------------------------------------------------------------------*/ |
| 1104 | static int hpc_wait_ctlr_notworking (int timeout, struct controller *ctlr_ptr, void __iomem *wpg_bbar, |
| 1105 | u8 * pstatus) |
| 1106 | { |
| 1107 | int rc = 0; |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 1108 | u8 done = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | |
| 1110 | debug_polling ("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout); |
| 1111 | |
| 1112 | while (!done) { |
| 1113 | *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX); |
| 1114 | if (*pstatus == HPC_ERROR) { |
| 1115 | rc = HPC_ERROR; |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 1116 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | } |
| 1118 | if (CTLR_WORKING (*pstatus) == HPC_CTLR_WORKING_NO) |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 1119 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | if (!done) { |
| 1121 | msleep(1000); |
| 1122 | if (timeout < 1) { |
Kristen Accardi | dc6712d | 2006-03-14 16:24:47 -0800 | [diff] [blame] | 1123 | done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | err ("HPCreadslot - Error ctlr timeout\n"); |
| 1125 | rc = HPC_ERROR; |
| 1126 | } else |
| 1127 | timeout--; |
| 1128 | } |
| 1129 | } |
| 1130 | debug_polling ("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus); |
| 1131 | return rc; |
| 1132 | } |