LXR linux/drivers/scsi/smartpqi/smartpqi

   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 */
  63struct 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
  81static 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
 114int 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
 120int 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
 126bool 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
 146bool 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
 152u32 sis_get_product_id(struct pqi_ctrl_info *ctrl_info)
 153{
 154        return readl(&ctrl_info->registers->sis_product_identifier);
 155}
 156
 157/* used for passing command parameters/results when issuing SIS commands */
 158struct sis_sync_cmd_params {
 159        u32     mailbox[6];     /* mailboxes 0-5 */
 160};
 161
 162static int sis_send_sync_cmd(struct pqi_ctrl_info *ctrl_info,
 163        u32 cmd, struct sis_sync_cmd_params *params)
 164{
 165        struct pqi_ctrl_registers __iomem *registers;
 166        unsigned int i;
 167        unsigned long timeout;
 168        u32 doorbell;
 169        u32 cmd_status;
 170
 171        registers = ctrl_info->registers;
 172
 173        /* Write the command to mailbox 0. */
 174        writel(cmd, &registers->sis_mailbox[0]);
 175
 176        /*
 177         * Write the command parameters to mailboxes 1-4 (mailbox 5 is not used
 178         * when sending a command to the controller).
 179         */
 180        for (i = 1; i <= 4; i++)
 181                writel(params->mailbox[i], &registers->sis_mailbox[i]);
 182
 183        /* Clear the command doorbell. */
 184        writel(SIS_CLEAR_CTRL_TO_HOST_DOORBELL,
 185                &registers->sis_ctrl_to_host_doorbell_clear);
 186
 187        /* Disable doorbell interrupts by masking all interrupts. */
 188        writel(~0, &registers->sis_interrupt_mask);
 189
 190        /*
 191         * Force the completion of the interrupt mask register write before
 192         * submitting the command.
 193         */
 194        readl(&registers->sis_interrupt_mask);
 195
 196        /* Submit the command to the controller. */
 197        writel(SIS_CMD_READY, &registers->sis_host_to_ctrl_doorbell);
 198
 199        /*
 200         * Poll for command completion.  Note that the call to msleep() is at
 201         * the top of the loop in order to give the controller time to start
 202         * processing the command before we start polling.
 203         */
 204        timeout = (SIS_CMD_COMPLETE_TIMEOUT_SECS * PQI_HZ) + jiffies;
 205        while (1) {
 206                msleep(SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS);
 207                doorbell = readl(&registers->sis_ctrl_to_host_doorbell);
 208                if (doorbell & SIS_CMD_COMPLETE)
 209                        break;
 210                if (time_after(jiffies, timeout))
 211                        return -ETIMEDOUT;
 212        }
 213
 214        /* Read the command status from mailbox 0. */
 215        cmd_status = readl(&registers->sis_mailbox[0]);
 216        if (cmd_status != SIS_CMD_STATUS_SUCCESS) {
 217                dev_err(&ctrl_info->pci_dev->dev,
 218                        "SIS command failed for command 0x%x: status = 0x%x\n",
 219                        cmd, cmd_status);
 220                return -EINVAL;
 221        }
 222
 223        /*
 224         * The command completed successfully, so save the command status and
 225         * read the values returned in mailboxes 1-5.
 226         */
 227        params->mailbox[0] = cmd_status;
 228        for (i = 1; i < ARRAY_SIZE(params->mailbox); i++)
 229                params->mailbox[i] = readl(&registers->sis_mailbox[i]);
 230
 231        return 0;
 232}
 233
 234/*
 235 * This function verifies that we are talking to a controller that speaks PQI.
 236 */
 237
 238int sis_get_ctrl_properties(struct pqi_ctrl_info *ctrl_info)
 239{
 240        int rc;
 241        u32 properties;
 242        u32 extended_properties;
 243        struct sis_sync_cmd_params params;
 244
 245        memset(&params, 0, sizeof(params));
 246
 247        rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_ADAPTER_PROPERTIES,
 248                &params);
 249        if (rc)
 250                return rc;
 251
 252        properties = params.mailbox[1];
 253
 254        if (!(properties & SIS_EXTENDED_PROPERTIES_SUPPORTED))
 255                return -ENODEV;
 256
 257        extended_properties = params.mailbox[4];
 258
 259        if ((extended_properties & SIS_REQUIRED_EXTENDED_PROPERTIES) !=
 260                SIS_REQUIRED_EXTENDED_PROPERTIES)
 261                return -ENODEV;
 262
 263        if (extended_properties & SIS_PQI_RESET_QUIESCE_SUPPORTED)
 264                ctrl_info->pqi_reset_quiesce_supported = true;
 265
 266        return 0;
 267}
 268
 269int sis_get_pqi_capabilities(struct pqi_ctrl_info *ctrl_info)
 270{
 271        int rc;
 272        struct sis_sync_cmd_params params;
 273
 274        memset(&params, 0, sizeof(params));
 275
 276        rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_PQI_CAPABILITIES,
 277                &params);
 278        if (rc)
 279                return rc;
 280
 281        ctrl_info->max_sg_entries = params.mailbox[1];
 282        ctrl_info->max_transfer_size = params.mailbox[2];
 283        ctrl_info->max_outstanding_requests = params.mailbox[3];
 284        ctrl_info->config_table_offset = params.mailbox[4];
 285        ctrl_info->config_table_length = params.mailbox[5];
 286
 287        return 0;
 288}
 289
 290int sis_init_base_struct_addr(struct pqi_ctrl_info *ctrl_info)
 291{
 292        int rc;
 293        void *base_struct_unaligned;
 294        struct sis_base_struct *base_struct;
 295        struct sis_sync_cmd_params params;
 296        unsigned long error_buffer_paddr;
 297        dma_addr_t bus_address;
 298
 299        base_struct_unaligned = kzalloc(sizeof(*base_struct)
 300                + SIS_BASE_STRUCT_ALIGNMENT - 1, GFP_KERNEL);
 301        if (!base_struct_unaligned)
 302                return -ENOMEM;
 303
 304        base_struct = PTR_ALIGN(base_struct_unaligned,
 305                SIS_BASE_STRUCT_ALIGNMENT);
 306        error_buffer_paddr = (unsigned long)ctrl_info->error_buffer_dma_handle;
 307
 308        put_unaligned_le32(SIS_BASE_STRUCT_REVISION, &base_struct->revision);
 309        put_unaligned_le32(lower_32_bits(error_buffer_paddr),
 310                &base_struct->error_buffer_paddr_low);
 311        put_unaligned_le32(upper_32_bits(error_buffer_paddr),
 312                &base_struct->error_buffer_paddr_high);
 313        put_unaligned_le32(PQI_ERROR_BUFFER_ELEMENT_LENGTH,
 314                &base_struct->error_buffer_element_length);
 315        put_unaligned_le32(ctrl_info->max_io_slots,
 316                &base_struct->error_buffer_num_elements);
 317
 318        bus_address = dma_map_single(&ctrl_info->pci_dev->dev, base_struct,
 319                sizeof(*base_struct), DMA_TO_DEVICE);
 320        if (dma_mapping_error(&ctrl_info->pci_dev->dev, bus_address)) {
 321                rc = -ENOMEM;
 322                goto out;
 323        }
 324
 325        memset(&params, 0, sizeof(params));
 326        params.mailbox[1] = lower_32_bits((u64)bus_address);
 327        params.mailbox[2] = upper_32_bits((u64)bus_address);
 328        params.mailbox[3] = sizeof(*base_struct);
 329
 330        rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_INIT_BASE_STRUCT_ADDRESS,
 331                &params);
 332
 333        dma_unmap_single(&ctrl_info->pci_dev->dev, bus_address,
 334                        sizeof(*base_struct), DMA_TO_DEVICE);
 335out:
 336        kfree(base_struct_unaligned);
 337
 338        return rc;
 339}
 340
 341#define SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS     30
 342
 343static int sis_wait_for_doorbell_bit_to_clear(
 344        struct pqi_ctrl_info *ctrl_info, u32 bit)
 345{
 346        int rc = 0;
 347        u32 doorbell_register;
 348        unsigned long timeout;
 349
 350        timeout = (SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS * PQI_HZ) + jiffies;
 351
 352        while (1) {
 353                doorbell_register =
 354                        readl(&ctrl_info->registers->sis_host_to_ctrl_doorbell);
 355                if ((doorbell_register & bit) == 0)
 356                        break;
 357                if (readl(&ctrl_info->registers->sis_firmware_status) &
 358                        SIS_CTRL_KERNEL_PANIC) {
 359                        rc = -ENODEV;
 360                        break;
 361                }
 362                if (time_after(jiffies, timeout)) {
 363                        dev_err(&ctrl_info->pci_dev->dev,
 364                                "doorbell register bit 0x%x not cleared\n",
 365                                bit);
 366                        rc = -ETIMEDOUT;
 367                        break;
 368                }
 369                usleep_range(1000, 2000);
 370        }
 371
 372        return rc;
 373}
 374
 375static inline int sis_set_doorbell_bit(struct pqi_ctrl_info *ctrl_info, u32 bit)
 376{
 377        writel(bit, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 378
 379        return sis_wait_for_doorbell_bit_to_clear(ctrl_info, bit);
 380}
 381
 382void sis_enable_msix(struct pqi_ctrl_info *ctrl_info)
 383{
 384        sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_MSIX);
 385}
 386
 387void sis_enable_intx(struct pqi_ctrl_info *ctrl_info)
 388{
 389        sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_INTX);
 390}
 391
 392void sis_shutdown_ctrl(struct pqi_ctrl_info *ctrl_info)
 393{
 394        if (readl(&ctrl_info->registers->sis_firmware_status) &
 395                SIS_CTRL_KERNEL_PANIC)
 396                return;
 397
 398        writel(SIS_TRIGGER_SHUTDOWN,
 399                &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 400}
 401
 402int sis_pqi_reset_quiesce(struct pqi_ctrl_info *ctrl_info)
 403{
 404        return sis_set_doorbell_bit(ctrl_info, SIS_PQI_RESET_QUIESCE);
 405}
 406
 407int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
 408{
 409        return sis_set_doorbell_bit(ctrl_info, SIS_REENABLE_SIS_MODE);
 410}
 411
 412void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
 413{
 414        writel(value, &ctrl_info->registers->sis_driver_scratch);
 415}
 416
 417u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
 418{
 419        return readl(&ctrl_info->registers->sis_driver_scratch);
 420}
 421
 422void sis_soft_reset(struct pqi_ctrl_info *ctrl_info)
 423{
 424        writel(SIS_SOFT_RESET,
 425                &ctrl_info->registers->sis_host_to_ctrl_doorbell);
 426}
 427
 428static void __attribute__((unused)) verify_structures(void)
 429{
 430        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 431                revision) != 0x0);
 432        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 433                flags) != 0x4);
 434        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 435                error_buffer_paddr_low) != 0x8);
 436        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 437                error_buffer_paddr_high) != 0xc);
 438        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 439                error_buffer_element_length) != 0x10);
 440        BUILD_BUG_ON(offsetof(struct sis_base_struct,
 441                error_buffer_num_elements) != 0x14);
 442        BUILD_BUG_ON(sizeof(struct sis_base_struct) != 0x18);
 443}
 444