drivers/scsi/smartpqi/smartpqi_sis.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    driver for Microsemi PQI-based storage controllers
   4  *    Copyright (c) 2019-2020 Microchip Technology Inc. and its subsidiaries
   5  *    Copyright (c) 2016-2018 Microsemi Corporation
   6  *    Copyright (c) 2016 PMC-Sierra, Inc.
   7  *
   8  *    Questions/Comments/Bugfixes to storagedev@microchip.com
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/delay.h>
  15 #include <linux/pci.h>
  16 #include <scsi/scsi_device.h>
  17 #include <asm/unaligned.h>
  18 #include "smartpqi.h"
  19 #include "smartpqi_sis.h"
  20
  21 /* legacy SIS interface commands */
  22 #define SIS_CMD_GET_ADAPTER_PROPERTIES          0x19
  23 #define SIS_CMD_INIT_BASE_STRUCT_ADDRESS        0x1b
  24 #define SIS_CMD_GET_PQI_CAPABILITIES            0x3000
  25
  26 /* for submission of legacy SIS commands */
  27 #define SIS_REENABLE_SIS_MODE                   0x1
  28 #define SIS_ENABLE_MSIX                         0x40
  29 #define SIS_ENABLE_INTX                         0x80
  30 #define SIS_SOFT_RESET                          0x100
  31 #define SIS_CMD_READY                           0x200
  32 #define SIS_TRIGGER_SHUTDOWN                    0x800000
  33 #define SIS_PQI_RESET_QUIESCE                   0x1000000
  34
  35 #define SIS_CMD_COMPLETE                        0x1000
  36 #define SIS_CLEAR_CTRL_TO_HOST_DOORBELL         0x1000
  37
  38 #define SIS_CMD_STATUS_SUCCESS                  0x1
  39 #define SIS_CMD_COMPLETE_TIMEOUT_SECS           30
  40 #define SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS    10
  41
  42 /* used with SIS_CMD_GET_ADAPTER_PROPERTIES command */
  43 #define SIS_EXTENDED_PROPERTIES_SUPPORTED       0x800000
  44 #define SIS_SMARTARRAY_FEATURES_SUPPORTED       0x2
  45 #define SIS_PQI_MODE_SUPPORTED                  0x4
  46 #define SIS_PQI_RESET_QUIESCE_SUPPORTED         0x8
  47 #define SIS_REQUIRED_EXTENDED_PROPERTIES        \
  48         (SIS_SMARTARRAY_FEATURES_SUPPORTED | SIS_PQI_MODE_SUPPORTED)
  49
  50 /* used with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
  51 #define SIS_BASE_STRUCT_REVISION                9
  52 #define SIS_BASE_STRUCT_ALIGNMENT               16
  53
  54 #define SIS_CTRL_KERNEL_UP                      0x80
  55 #define SIS_CTRL_KERNEL_PANIC                   0x100
  56 #define SIS_CTRL_READY_TIMEOUT_SECS             180
  57 #define SIS_CTRL_READY_RESUME_TIMEOUT_SECS      90
  58 #define SIS_CTRL_READY_POLL_INTERVAL_MSECS      10
  59
  60 #pragma pack(1)
  61
  62 /* for use with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
  63 struct sis_base_struct {
  64         __le32  revision;               /* revision of this structure */
  65         __le32  flags;                  /* reserved */
  66         __le32  error_buffer_paddr_low; /* lower 32 bits of physical memory */
  67                                         /* buffer for PQI error response */
  68                                         /* data */
  69         __le32  error_buffer_paddr_high;        /* upper 32 bits of physical */
  70                                                 /* memory buffer for PQI */
  71                                                 /* error response data */
  72         __le32  error_buffer_element_length;    /* length of each PQI error */
  73                                                 /* response buffer element */
  74                                                 /*   in bytes */
  75         __le32  error_buffer_num_elements;      /* total number of PQI error */
  76                                                 /* response buffers available */
  77 };
  78
  79 #pragma pack()
  80
  81 static int sis_wait_for_ctrl_ready_with_timeout(struct pqi_ctrl_info *ctrl_info,
  82         unsigned int timeout_secs)
  83 {
  84         unsigned long timeout;
  85         u32 status;
  86
  87         timeout = (timeout_secs * PQI_HZ) + jiffies;
  88
  89         while (1) {
  90                 status = readl(&ctrl_info->registers->sis_firmware_status);
  91                 if (status != ~0) {
  92                         if (status & SIS_CTRL_KERNEL_PANIC) {
  93                                 dev_err(&ctrl_info->pci_dev->dev,
  94                                         "controller is offline: status code 0x%x\n",
  95                                         readl(
  96                                         &ctrl_info->registers->sis_mailbox[7]));
  97                                 return -ENODEV;
  98                         }
  99                         if (status & SIS_CTRL_KERNEL_UP)
 100                                 break;
 101                 }
 102                 if (time_after(jiffies, timeout)) {
 103                         dev_err(&ctrl_info->pci_dev->dev,
 104                                 "controller not ready after %u seconds\n",
 105                                 timeout_secs);
 106                         return -ETIMEDOUT;
 107                 }
 108                 msleep(SIS_CTRL_READY_POLL_INTERVAL_MSECS);
 109         }
 110
 111         return 0;
 112 }
 113
 114 int sis_wait_for_ctrl_ready(struct pqi_ctrl_info *ctrl_info)
 115 {
 116         return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
 117                 SIS_CTRL_READY_TIMEOUT_SECS);
 118 }
 119
 120 int sis_wait_for_ctrl_ready_resume(struct pqi_ctrl_info *ctrl_info)
 121 {
 122         return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
 123                 SIS_CTRL_READY_RESUME_TIMEOUT_SECS);
 124 }
 125
 126 bool sis_is_firmware_running(struct pqi_ctrl_info *ctrl_info)
 127 {
 128         bool running;
 129         u32 status;
 130
 131         status = readl(&ctrl_info->registers->sis_firmware_status);
 132
 133         if (status & SIS_CTRL_KERNEL_PANIC)
 134                 running = false;
 135         else
 136                 running = true;
 137
 138         if (!running)
 139                 dev_err(&ctrl_info->pci_dev->dev,
 140                         "controller is offline: status code 0x%x\n",
 141                         readl(&ctrl_info->registers->sis_mailbox[7]));
 142
 143         return running;
 144 }
 145
 146 bool sis_is_kernel_up(struct pqi_ctrl_info *ctrl_info)
 147 {
 148         return readl(&ctrl_info->registers->sis_firmware_status) &
 149                                 SIS_CTRL_KERNEL_UP;
 150 }
 151
 152 /* used for passing command parameters/results when issuing SIS commands */
 153 struct sis_sync_cmd_params {
 154         u32     mailbox[6];     /* mailboxes 0-5 */
 155 };
 156
 157 static int sis_send_sync_cmd(struct pqi_ctrl_info *ctrl_info,
 158         u32 cmd, struct sis_sync_cmd_params *params)
 159 {
 160         struct pqi_ctrl_registers __iomem *registers;
 161         unsigned int i;
 162         unsigned long timeout;
 163         u32 doorbell;
 164         u32 cmd_status;
 165
 166         registers = ctrl_info->registers;
 167
 168         /* Write the command to mailbox 0. */
 169         writel(cmd, &registers->sis_mailbox[0]);
 170
 171         /*
 172          * Write the command parameters to mailboxes 1-4 (mailbox 5 is not used
 173          * when sending a command to the controller).
 174          */
 175         for (i = 1; i <= 4; i++)
 176                 writel(params->mailbox[i], &registers->sis_mailbox[i]);
 177
 178         /* Clear the command doorbell. */
 179         writel(SIS_CLEAR_CTRL_TO_HOST_DOORBELL,
 180                 &registers->sis_ctrl_to_host_doorbell_clear);
 181
 182         /* Disable doorbell interrupts by masking all interrupts. */
 183         writel(~0, &registers->sis_interrupt_mask);
 184
 185         /*
 186          * Force the completion of the interrupt mask register write before
 187          * submitting the command.
 188          */
 189         readl(&registers->sis_interrupt_mask);
 190
 191         /* Submit the command to the controller. */
 192         writel(SIS_CMD_READY, &registers->sis_host_to_ctrl_doorbell);
 193
 194         /*
 195          * Poll for command completion.  Note that the call to msleep() is at
 196          * the top of the loop in order to give the controller time to start
 197          * processing the command before we start polling.
 198          */
 199         timeout = (SIS_CMD_COMPLETE_TIMEOUT_SECS * PQI_HZ) + jiffies;
 200         while (1) {
 201                 msleep(SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS);
 202                 doorbell = readl(&registers->sis_ctrl_to_host_doorbell);
 203                 if (doorbell & SIS_CMD_COMPLETE)
 204                         break;
 205                 if (time_after(jiffies, timeout))
 206                         return -ETIMEDOUT;
 207         }
 208
 209         /* Read the command status from mailbox 0. */
 210         cmd_status = readl(&registers->sis_mailbox[0]);
 211         if (cmd_status != SIS_CMD_STATUS_SUCCESS) {
 212                 dev_err(&ctrl_info->pci_dev->dev,
 213                         "SIS command failed for command 0x%x: status = 0x%x\n",
 214                         cmd, cmd_status);
 215                 return -EINVAL;
 216         }
 217
 218         /*
 219          * The command completed successfully, so save the command status and
 220          * read the values returned in mailboxes 1-5.
 221          */
 222         params->mailbox[0] = cmd_status;
 223         for (i = 1; i < ARRAY_SIZE(params->mailbox); i++)
 224                 params->mailbox[i] = readl(&registers->sis_mailbox[i]);
 225
 226         return 0;
 227 }
 228
 229 /*
 230  * This function verifies that we are talking to a controller that speaks PQI.
 231  */
 232
 233 int sis_get_ctrl_properties(struct pqi_ctrl_info *ctrl_info)
 234 {
 235         int rc;
 236         u32 properties;
 237         u32 extended_properties;
 238         struct sis_sync_cmd_params params;
 239
 240         memset(&params, 0, sizeof(params));
 241
 242         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_ADAPTER_PROPERTIES,
 243                 &params);
 244         if (rc)
 245                 return rc;
 246
 247         properties = params.mailbox[1];
 248
 249         if (!(properties & SIS_EXTENDED_PROPERTIES_SUPPORTED))
 250                 return -ENODEV;
 251
 252         extended_properties = params.mailbox[4];
 253
 254         if ((extended_properties & SIS_REQUIRED_EXTENDED_PROPERTIES) !=
 255                 SIS_REQUIRED_EXTENDED_PROPERTIES)
 256                 return -ENODEV;
 257
 258         if (extended_properties & SIS_PQI_RESET_QUIESCE_SUPPORTED)
 259                 ctrl_info->pqi_reset_quiesce_supported = true;
 260
 261         return 0;
 262 }
 263
 264 int sis_get_pqi_capabilities(struct pqi_ctrl_info *ctrl_info)
 265 {
 266         int rc;
 267         struct sis_sync_cmd_params params;
 268
 269         memset(&params, 0, sizeof(params));
 270
 271         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_PQI_CAPABILITIES,
 272                 &params);
 273         if (rc)
 274                 return rc;
 275
 276         ctrl_info->max_sg_entries = params.mailbox[1];
 277         ctrl_info->max_transfer_size = params.mailbox[2];
 278         ctrl_info->max_outstanding_requests = params.mailbox[3];
 279         ctrl_info->config_table_offset = params.mailbox[4];
 280         ctrl_info->config_table_length = params.mailbox[5];
 281
 282         return 0;
 283 }
 284
 285 int sis_init_base_struct_addr(struct pqi_ctrl_info *ctrl_info)
 286 {
 287         int rc;
 288         void *base_struct_unaligned;
 289         struct sis_base_struct *base_struct;
 290         struct sis_sync_cmd_params params;
 291         unsigned long error_buffer_paddr;
 292         dma_addr_t bus_address;
 293
 294         base_struct_unaligned = kzalloc(sizeof(*base_struct)
 295                 + SIS_BASE_STRUCT_ALIGNMENT - 1, GFP_KERNEL);
 296         if (!base_struct_unaligned)
 297                 return -ENOMEM;
 298
 299         base_struct = PTR_ALIGN(base_struct_unaligned,
 300                 SIS_BASE_STRUCT_ALIGNMENT);
 301         error_buffer_paddr = (unsigned long)ctrl_info->error_buffer_dma_handle;
 302
 303         put_unaligned_le32(SIS_BASE_STRUCT_REVISION, &base_struct->revision);
 304         put_unaligned_le32(lower_32_bits(error_buffer_paddr),
 305                 &base_struct->error_buffer_paddr_low);
 306         put_unaligned_le32(upper_32_bits(error_buffer_paddr),
 307                 &base_struct->error_buffer_paddr_high);
 308         put_unaligned_le32(PQI_ERROR_BUFFER_ELEMENT_LENGTH,
 309                 &base_struct->error_buffer_element_length);
 310         put_unaligned_le32(ctrl_info->max_io_slots,
 311                 &base_struct->error_buffer_num_elements);
 312
 313         bus_address = dma_map_single(&ctrl_info->pci_dev->dev, base_struct,
 314                 sizeof(*base_struct), DMA_TO_DEVICE);
 315         if (dma_mapping_error(&ctrl_info->pci_dev->dev, bus_address)) {
 316                 rc = -ENOMEM;
 317                 goto out;
 318         }
 319
 320         memset(&params, 0, sizeof(params));
 321         params.mailbox[1] = lower_32_bits((u64)bus_address);
 322         params.mailbox[2] = upper_32_bits((u64)bus_address);
 323         params.mailbox[3] = sizeof(*base_struct);
 324
 325         rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_INIT_BASE_STRUCT_ADDRESS,
 326                 &params);
 327
 328         dma_unmap_single(&ctrl_info->pci_dev->dev, bus_address,
 329                         sizeof(*base_struct), DMA_TO_DEVICE);
 330 out:
 331         kfree(base_struct_unaligned);
 332
 333         return rc;
 334 }
 335
 336 #define SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS     30
 337
 338 static int sis_wait_for_doorbell_bit_to_clear(
 339         struct pqi_ctrl_info *ctrl_info, u32 bit)
 340 {
 341         int rc = 0;
 342         u32 doorbell_register;
 343         unsigned long timeout;
 344
 345         timeout = (SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS * PQI_HZ) + jiffies;
 346
 347         while (1) {
 348                 doorbell_register =
 349                         readl(&ctrl_info->registers->sis_host_to_ctrl_doorbell);
 350                 if ((doorbell_register & bit) == 0)
 351                         break;
 352                 if (readl(&ctrl_info->registers->sis_firmware_status) &
 353                         SIS_CTRL_KERNEL_PANIC) {
 354                         rc = -ENODEV;
 355                         break;
 356                 }
 357                 if (time_after(jiffies, timeout)) {
 358                         dev_err(&ctrl_info->pci_dev->dev,
 359                                 "doorbell register bit 0x%x not cleared\n",
 360                                 bit);
 361                         rc = -ETIMEDOUT;
 362                         break;
 363                 }
 364                 usleep_range(1000, 2000);
 365         }
 366
 367         return rc;
 368 }
 369
 370 static inline int sis_set_doorbell_bit(struct pqi_ctrl_info *ctrl_info, u32 bit)
 371 {
 372         writel(bit, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 373
 374         return sis_wait_for_doorbell_bit_to_clear(ctrl_info, bit);
 375 }
 376
 377 void sis_enable_msix(struct pqi_ctrl_info *ctrl_info)
 378 {
 379         sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_MSIX);
 380 }
 381
 382 void sis_enable_intx(struct pqi_ctrl_info *ctrl_info)
 383 {
 384         sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_INTX);
 385 }
 386
 387 void sis_shutdown_ctrl(struct pqi_ctrl_info *ctrl_info)
 388 {
 389         if (readl(&ctrl_info->registers->sis_firmware_status) &
 390                 SIS_CTRL_KERNEL_PANIC)
 391                 return;
 392
 393         writel(SIS_TRIGGER_SHUTDOWN,
 394                 &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 395 }
 396
 397 int sis_pqi_reset_quiesce(struct pqi_ctrl_info *ctrl_info)
 398 {
 399         return sis_set_doorbell_bit(ctrl_info, SIS_PQI_RESET_QUIESCE);
 400 }
 401
 402 int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
 403 {
 404         return sis_set_doorbell_bit(ctrl_info, SIS_REENABLE_SIS_MODE);
 405 }
 406
 407 void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
 408 {
 409         writel(value, &ctrl_info->registers->sis_driver_scratch);
 410 }
 411
 412 u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
 413 {
 414         return readl(&ctrl_info->registers->sis_driver_scratch);
 415 }
 416
 417 void sis_soft_reset(struct pqi_ctrl_info *ctrl_info)
 418 {
 419         writel(SIS_SOFT_RESET,
 420                 &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 421 }
 422
 423 static void __attribute__((unused)) verify_structures(void)
 424 {
 425         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 426                 revision) != 0x0);
 427         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 428                 flags) != 0x4);
 429         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 430                 error_buffer_paddr_low) != 0x8);
 431         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 432                 error_buffer_paddr_high) != 0xc);
 433         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 434                 error_buffer_element_length) != 0x10);
 435         BUILD_BUG_ON(offsetof(struct sis_base_struct,
 436                 error_buffer_num_elements) != 0x14);
 437         BUILD_BUG_ON(sizeof(struct sis_base_struct) != 0x18);
 438 }