drivers/scsi/smartpqi/smartpqi_sis.c

   1 /*
   2  *    driver for Microsemi PQI-based storage controllers
   3  *    Copyright (c) 2016-2017 Microsemi Corporation
   4  *    Copyright (c) 2016 PMC-Sierra, Inc.
   5  *
   6  *    This program is free software; you can redistribute it and/or modify
   7  *    it under the terms of the GNU General Public License as published by
   8  *    the Free Software Foundation; version 2 of the License.
   9  *
  10  *    This program is distributed in the hope that it will be useful,
  11  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  13  *    NON INFRINGEMENT.  See the GNU General Public License for more details.
  14  *
  15  *    Questions/Comments/Bugfixes to esc.storagedev@microsemi.com
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/delay.h>
  22 #include <linux/pci.h>
  23 #include <scsi/scsi_device.h>
  24 #include <asm/unaligned.h>
  25 #include "smartpqi.h"
  26 #include "smartpqi_sis.h"
  27
  28 /* legacy SIS interface commands */
  29 #define SIS_CMD_GET_ADAPTER_PROPERTIES          0x19
  30 #define SIS_CMD_INIT_BASE_STRUCT_ADDRESS        0x1b
  31 #define SIS_CMD_GET_PQI_CAPABILITIES            0x3000
  32
  33 /* for submission of legacy SIS commands */
  34 #define SIS_REENABLE_SIS_MODE                   0x1
  35 #define SIS_ENABLE_MSIX                         0x40
  36 #define SIS_ENABLE_INTX                         0x80
  37 #define SIS_CMD_READY                           0x200
  38 #define SIS_TRIGGER_SHUTDOWN                    0x800000
  39 #define SIS_PQI_RESET_QUIESCE                   0x1000000
  40
  41 #define SIS_CMD_COMPLETE                        0x1000
  42 #define SIS_CLEAR_CTRL_TO_HOST_DOORBELL         0x1000
  43
  44 #define SIS_CMD_STATUS_SUCCESS                  0x1
  45 #define SIS_CMD_COMPLETE_TIMEOUT_SECS           30
  46 #define SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS    10
  47
  48 /* used with SIS_CMD_GET_ADAPTER_PROPERTIES command */
  49 #define SIS_EXTENDED_PROPERTIES_SUPPORTED       0x800000
  50 #define SIS_SMARTARRAY_FEATURES_SUPPORTED       0x2
  51 #define SIS_PQI_MODE_SUPPORTED                  0x4
  52 #define SIS_PQI_RESET_QUIESCE_SUPPORTED         0x8
  53 #define SIS_REQUIRED_EXTENDED_PROPERTIES        \
  54         (SIS_SMARTARRAY_FEATURES_SUPPORTED | SIS_PQI_MODE_SUPPORTED)
  55
  56 /* used with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
  57 #define SIS_BASE_STRUCT_REVISION                9
  58 #define SIS_BASE_STRUCT_ALIGNMENT               16
  59
  60 #define SIS_CTRL_KERNEL_UP                      0x80
  61 #define SIS_CTRL_KERNEL_PANIC                   0x100
  62 #define SIS_CTRL_READY_TIMEOUT_SECS             180
  63 #define SIS_CTRL_READY_RESUME_TIMEOUT_SECS      90
  64 #define SIS_CTRL_READY_POLL_INTERVAL_MSECS      10
  65
  66 #pragma pack(1)
  67
  68 /* for use with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
  69 struct sis_base_struct {
  70         __le32  revision;               /* revision of this structure */
  71         __le32  flags;                  /* reserved */
  72         __le32  error_buffer_paddr_low; /* lower 32 bits of physical memory */
  73                                         /* buffer for PQI error response */
  74                                         /* data */
  75         __le32  error_buffer_paddr_high;        /* upper 32 bits of physical */
  76                                                 /* memory buffer for PQI */
  77                                                 /* error response data */
  78         __le32  error_buffer_element_length;    /* length of each PQI error */
  79                                                 /* response buffer element */
  80                                                 /*   in bytes */
  81         __le32  error_buffer_num_elements;      /* total number of PQI error */
  82                                                 /* response buffers available */
  83 };
  84
  85 #pragma pack()
  86
  87 static int sis_wait_for_ctrl_ready_with_timeout(struct pqi_ctrl_info *ctrl_info,
  88         unsigned int timeout_secs)
  89 {
  90         unsigned long timeout;
  91         u32 status;
  92
  93         timeout = (timeout_secs * HZ) + jiffies;
  94
  95         while (1) {
  96                 status = readl(&ctrl_info->registers->sis_firmware_status);
  97                 if (status != ~0) {
  98                         if (status & SIS_CTRL_KERNEL_PANIC) {
  99                                 dev_err(&ctrl_info->pci_dev->dev,
 100                                         "controller is offline: status code 0x%x\n",
 101                                         readl(
 102                                         &ctrl_info->registers->sis_mailbox[7]));
 103                                 return -ENODEV;
 104                         }
 105                         if (status & SIS_CTRL_KERNEL_UP)
 106                                 break;
 107                 }
 108                 if (time_after(jiffies, timeout)) {
 109                         dev_err(&ctrl_info->pci_dev->dev,
 110                                 "controller not ready after %u seconds\n",
 111                                 timeout_secs);
 112                         return -ETIMEDOUT;
 113                 }
 114                 msleep(SIS_CTRL_READY_POLL_INTERVAL_MSECS);
 115         }
 116
 117         return 0;
 118 }
 119
 120 int sis_wait_for_ctrl_ready(struct pqi_ctrl_info *ctrl_info)
 121 {
 122         return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
 123                 SIS_CTRL_READY_TIMEOUT_SECS);
 124 }
 125
 126 int sis_wait_for_ctrl_ready_resume(struct pqi_ctrl_info *ctrl_info)
 127 {
 128         return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
 129                 SIS_CTRL_READY_RESUME_TIMEOUT_SECS);
 130 }
 131
 132 bool sis_is_firmware_running(struct pqi_ctrl_info *ctrl_info)
 133 {
 134         bool running;
 135         u32 status;
 136
 137         status = readl(&ctrl_info->registers->sis_firmware_status);
 138
 139         if (status & SIS_CTRL_KERNEL_PANIC)
 140                 running = false;
 141         else
 142                 running = true;
 143
 144         if (!running)
 145                 dev_err(&ctrl_info->pci_dev->dev,
 146                         "controller is offline: status code 0x%x\n",
 147                         readl(&ctrl_info->registers->sis_mailbox[7]));
 148
 149         return running;
 150 }
 151
 152 bool sis_is_kernel_up(struct pqi_ctrl_info *ctrl_info)
 153 {
 154         return readl(&ctrl_info->registers->sis_firmware_status) &
 155                                 SIS_CTRL_KERNEL_UP;
 156 }
 157
 158 /* used for passing command parameters/results when issuing SIS commands */
 159 struct sis_sync_cmd_params {
 160         u32     mailbox[6];     /* mailboxes 0-5 */
 161 };
 162
 163 static int sis_send_sync_cmd(struct pqi_ctrl_info *ctrl_info,
 164         u32 cmd, struct sis_sync_cmd_params *params)
 165 {
 166         struct pqi_ctrl_registers __iomem *registers;
 167         unsigned int i;
 168         unsigned long timeout;
 169         u32 doorbell;
 170         u32 cmd_status;
 171
 172         registers = ctrl_info->registers;
 173
 174         /* Write the command to mailbox 0. */
 175         writel(cmd, &registers->sis_mailbox[0]);
 176
 177         /*
 178          * Write the command parameters to mailboxes 1-4 (mailbox 5 is not used
 179          * when sending a command to the controller).
 180          */
 181         for (i = 1; i <= 4; i++)
 182                 writel(params->mailbox[i], &registers->sis_mailbox[i]);
 183
 184         /* Clear the command doorbell. */
 185         writel(SIS_CLEAR_CTRL_TO_HOST_DOORBELL,
 186                 &registers->sis_ctrl_to_host_doorbell_clear);
 187
 188         /* Disable doorbell interrupts by masking all interrupts. */
 189         writel(~0, &registers->sis_interrupt_mask);
 190
 191         /*
 192          * Force the completion of the interrupt mask register write before
 193          * submitting the command.
 194          */
 195         readl(&registers->sis_interrupt_mask);
 196
 197         /* Submit the command to the controller. */
 198         writel(SIS_CMD_READY, &registers->sis_host_to_ctrl_doorbell);
 199
 200         /*
 201          * Poll for command completion.  Note that the call to msleep() is at
 202          * the top of the loop in order to give the controller time to start
 203          * processing the command before we start polling.
 204          */
 205         timeout = (SIS_CMD_COMPLETE_TIMEOUT_SECS * HZ) + jiffies;
 206         while (1) {
 207                 msleep(SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS);
 208                 doorbell = readl(&registers->sis_ctrl_to_host_doorbell);
 209                 if (doorbell & SIS_CMD_COMPLETE)
 210                         break;
 211                 if (time_after(jiffies, timeout))
 212                         return -ETIMEDOUT;
 213         }
 214
 215         /* Read the command status from mailbox 0. */
 216         cmd_status = readl(&registers->sis_mailbox[0]);
 217         if (cmd_status != SIS_CMD_STATUS_SUCCESS) {
 218                 dev_err(&ctrl_info->pci_dev->dev,
 219                         "SIS command failed for command 0x%x: status = 0x%x\n",
 220                         cmd, cmd_status);
 221                 return -EINVAL;
 222         }
 223
 224         /*
 225          * The command completed successfully, so save the command status and
 226          * read the values returned in mailboxes 1-5.
 227          */
 228         params->mailbox[0] = cmd_status;
 229         for (i = 1; i < ARRAY_SIZE(params->mailbox); i++)
 230                 params->mailbox[i] = readl(&registers->sis_mailbox[i]);
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * This function verifies that we are talking to a controller that speaks PQI.
 237  */
 238
 239 int sis_get_ctrl_properties(struct pqi_ctrl_info *ctrl_info)
 240 {
 241         int rc;
 242         u32 properties;
 243         u32 extended_properties;
 244         struct sis_sync_cmd_params params;
 245
 246         memset(&params, 0, sizeof(params));
 247
 248         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_ADAPTER_PROPERTIES,
 249                 &params);
 250         if (rc)
 251                 return rc;
 252
 253         properties = params.mailbox[1];
 254
 255         if (!(properties & SIS_EXTENDED_PROPERTIES_SUPPORTED))
 256                 return -ENODEV;
 257
 258         extended_properties = params.mailbox[4];
 259
 260         if ((extended_properties & SIS_REQUIRED_EXTENDED_PROPERTIES) !=
 261                 SIS_REQUIRED_EXTENDED_PROPERTIES)
 262                 return -ENODEV;
 263
 264         if (extended_properties & SIS_PQI_RESET_QUIESCE_SUPPORTED)
 265                 ctrl_info->pqi_reset_quiesce_supported = true;
 266
 267         return 0;
 268 }
 269
 270 int sis_get_pqi_capabilities(struct pqi_ctrl_info *ctrl_info)
 271 {
 272         int rc;
 273         struct sis_sync_cmd_params params;
 274
 275         memset(&params, 0, sizeof(params));
 276
 277         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_PQI_CAPABILITIES,
 278                 &params);
 279         if (rc)
 280                 return rc;
 281
 282         ctrl_info->max_sg_entries = params.mailbox[1];
 283         ctrl_info->max_transfer_size = params.mailbox[2];
 284         ctrl_info->max_outstanding_requests = params.mailbox[3];
 285         ctrl_info->config_table_offset = params.mailbox[4];
 286         ctrl_info->config_table_length = params.mailbox[5];
 287
 288         return 0;
 289 }
 290
 291 int sis_init_base_struct_addr(struct pqi_ctrl_info *ctrl_info)
 292 {
 293         int rc;
 294         void *base_struct_unaligned;
 295         struct sis_base_struct *base_struct;
 296         struct sis_sync_cmd_params params;
 297         unsigned long error_buffer_paddr;
 298         dma_addr_t bus_address;
 299
 300         base_struct_unaligned = kzalloc(sizeof(*base_struct)
 301                 + SIS_BASE_STRUCT_ALIGNMENT - 1, GFP_KERNEL);
 302         if (!base_struct_unaligned)
 303                 return -ENOMEM;
 304
 305         base_struct = PTR_ALIGN(base_struct_unaligned,
 306                 SIS_BASE_STRUCT_ALIGNMENT);
 307         error_buffer_paddr = (unsigned long)ctrl_info->error_buffer_dma_handle;
 308
 309         put_unaligned_le32(SIS_BASE_STRUCT_REVISION, &base_struct->revision);
 310         put_unaligned_le32(lower_32_bits(error_buffer_paddr),
 311                 &base_struct->error_buffer_paddr_low);
 312         put_unaligned_le32(upper_32_bits(error_buffer_paddr),
 313                 &base_struct->error_buffer_paddr_high);
 314         put_unaligned_le32(PQI_ERROR_BUFFER_ELEMENT_LENGTH,
 315                 &base_struct->error_buffer_element_length);
 316         put_unaligned_le32(ctrl_info->max_io_slots,
 317                 &base_struct->error_buffer_num_elements);
 318
 319         bus_address = pci_map_single(ctrl_info->pci_dev, base_struct,
 320                 sizeof(*base_struct), PCI_DMA_TODEVICE);
 321         if (pci_dma_mapping_error(ctrl_info->pci_dev, bus_address)) {
 322                 rc = -ENOMEM;
 323                 goto out;
 324         }
 325
 326         memset(&params, 0, sizeof(params));
 327         params.mailbox[1] = lower_32_bits((u64)bus_address);
 328         params.mailbox[2] = upper_32_bits((u64)bus_address);
 329         params.mailbox[3] = sizeof(*base_struct);
 330
 331         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_INIT_BASE_STRUCT_ADDRESS,
 332                 &params);
 333
 334         pci_unmap_single(ctrl_info->pci_dev, bus_address, sizeof(*base_struct),
 335                 PCI_DMA_TODEVICE);
 336
 337 out:
 338         kfree(base_struct_unaligned);
 339
 340         return rc;
 341 }
 342
 343 #define SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS     30
 344
 345 static int sis_wait_for_doorbell_bit_to_clear(
 346         struct pqi_ctrl_info *ctrl_info, u32 bit)
 347 {
 348         int rc = 0;
 349         u32 doorbell_register;
 350         unsigned long timeout;
 351
 352         timeout = (SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS * HZ) + jiffies;
 353
 354         while (1) {
 355                 doorbell_register =
 356                         readl(&ctrl_info->registers->sis_host_to_ctrl_doorbell);
 357                 if ((doorbell_register & bit) == 0)
 358                         break;
 359                 if (readl(&ctrl_info->registers->sis_firmware_status) &
 360                         SIS_CTRL_KERNEL_PANIC) {
 361                         rc = -ENODEV;
 362                         break;
 363                 }
 364                 if (time_after(jiffies, timeout)) {
 365                         dev_err(&ctrl_info->pci_dev->dev,
 366                                 "doorbell register bit 0x%x not cleared\n",
 367                                 bit);
 368                         rc = -ETIMEDOUT;
 369                         break;
 370                 }
 371                 usleep_range(1000, 2000);
 372         }
 373
 374         return rc;
 375 }
 376
 377 static inline int sis_set_doorbell_bit(struct pqi_ctrl_info *ctrl_info, u32 bit)
 378 {
 379         writel(bit, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 380
 381         return sis_wait_for_doorbell_bit_to_clear(ctrl_info, bit);
 382 }
 383
 384 void sis_enable_msix(struct pqi_ctrl_info *ctrl_info)
 385 {
 386         sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_MSIX);
 387 }
 388
 389 void sis_enable_intx(struct pqi_ctrl_info *ctrl_info)
 390 {
 391         sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_INTX);
 392 }
 393
 394 void sis_shutdown_ctrl(struct pqi_ctrl_info *ctrl_info)
 395 {
 396         if (readl(&ctrl_info->registers->sis_firmware_status) &
 397                 SIS_CTRL_KERNEL_PANIC)
 398                 return;
 399
 400         writel(SIS_TRIGGER_SHUTDOWN,
 401                 &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 402 }
 403
 404 int sis_pqi_reset_quiesce(struct pqi_ctrl_info *ctrl_info)
 405 {
 406         return sis_set_doorbell_bit(ctrl_info, SIS_PQI_RESET_QUIESCE);
 407 }
 408
 409 int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
 410 {
 411         return sis_set_doorbell_bit(ctrl_info, SIS_REENABLE_SIS_MODE);
 412 }
 413
 414 void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
 415 {
 416         writel(value, &ctrl_info->registers->sis_driver_scratch);
 417 }
 418
 419 u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
 420 {
 421         return readl(&ctrl_info->registers->sis_driver_scratch);
 422 }
 423
 424 static void __attribute__((unused)) verify_structures(void)
 425 {
 426         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 427                 revision) != 0x0);
 428         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 429                 flags) != 0x4);
 430         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 431                 error_buffer_paddr_low) != 0x8);
 432         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 433                 error_buffer_paddr_high) != 0xc);
 434         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 435                 error_buffer_element_length) != 0x10);
 436         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 437                 error_buffer_num_elements) != 0x14);
 438         BUILD_BUG_ON(sizeof(struct sis_base_struct) != 0x18);
 439 }