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path: root/drivers/scsi/smartpqi/smartpqi_sis.c
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Diffstat (limited to 'drivers/scsi/smartpqi/smartpqi_sis.c')
-rw-r--r--drivers/scsi/smartpqi/smartpqi_sis.c502
1 files changed, 502 insertions, 0 deletions
diff --git a/drivers/scsi/smartpqi/smartpqi_sis.c b/drivers/scsi/smartpqi/smartpqi_sis.c
new file mode 100644
index 000000000..5811fb3c2
--- /dev/null
+++ b/drivers/scsi/smartpqi/smartpqi_sis.c
@@ -0,0 +1,502 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * driver for Microchip PQI-based storage controllers
+ * Copyright (c) 2019-2022 Microchip Technology Inc. and its subsidiaries
+ * Copyright (c) 2016-2018 Microsemi Corporation
+ * Copyright (c) 2016 PMC-Sierra, Inc.
+ *
+ * Questions/Comments/Bugfixes to storagedev@microchip.com
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <scsi/scsi_device.h>
+#include <asm/unaligned.h>
+#include "smartpqi.h"
+#include "smartpqi_sis.h"
+
+/* legacy SIS interface commands */
+#define SIS_CMD_GET_ADAPTER_PROPERTIES 0x19
+#define SIS_CMD_INIT_BASE_STRUCT_ADDRESS 0x1b
+#define SIS_CMD_GET_PQI_CAPABILITIES 0x3000
+
+/* for submission of legacy SIS commands */
+#define SIS_REENABLE_SIS_MODE 0x1
+#define SIS_ENABLE_MSIX 0x40
+#define SIS_ENABLE_INTX 0x80
+#define SIS_SOFT_RESET 0x100
+#define SIS_CMD_READY 0x200
+#define SIS_TRIGGER_SHUTDOWN 0x800000
+#define SIS_PQI_RESET_QUIESCE 0x1000000
+
+#define SIS_CMD_COMPLETE 0x1000
+#define SIS_CLEAR_CTRL_TO_HOST_DOORBELL 0x1000
+
+#define SIS_CMD_STATUS_SUCCESS 0x1
+#define SIS_CMD_COMPLETE_TIMEOUT_SECS 30
+#define SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS 10
+
+/* used with SIS_CMD_GET_ADAPTER_PROPERTIES command */
+#define SIS_EXTENDED_PROPERTIES_SUPPORTED 0x800000
+#define SIS_SMARTARRAY_FEATURES_SUPPORTED 0x2
+#define SIS_PQI_MODE_SUPPORTED 0x4
+#define SIS_PQI_RESET_QUIESCE_SUPPORTED 0x8
+#define SIS_REQUIRED_EXTENDED_PROPERTIES \
+ (SIS_SMARTARRAY_FEATURES_SUPPORTED | SIS_PQI_MODE_SUPPORTED)
+
+/* used with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
+#define SIS_BASE_STRUCT_REVISION 9
+#define SIS_BASE_STRUCT_ALIGNMENT 16
+
+#define SIS_CTRL_KERNEL_FW_TRIAGE 0x3
+#define SIS_CTRL_KERNEL_UP 0x80
+#define SIS_CTRL_KERNEL_PANIC 0x100
+#define SIS_CTRL_READY_TIMEOUT_SECS 180
+#define SIS_CTRL_READY_RESUME_TIMEOUT_SECS 90
+#define SIS_CTRL_READY_POLL_INTERVAL_MSECS 10
+
+enum sis_fw_triage_status {
+ FW_TRIAGE_NOT_STARTED = 0,
+ FW_TRIAGE_STARTED,
+ FW_TRIAGE_COND_INVALID,
+ FW_TRIAGE_COMPLETED
+};
+
+#pragma pack(1)
+
+/* for use with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
+struct sis_base_struct {
+ __le32 revision; /* revision of this structure */
+ __le32 flags; /* reserved */
+ __le32 error_buffer_paddr_low; /* lower 32 bits of physical memory */
+ /* buffer for PQI error response */
+ /* data */
+ __le32 error_buffer_paddr_high; /* upper 32 bits of physical */
+ /* memory buffer for PQI */
+ /* error response data */
+ __le32 error_buffer_element_length; /* length of each PQI error */
+ /* response buffer element */
+ /* in bytes */
+ __le32 error_buffer_num_elements; /* total number of PQI error */
+ /* response buffers available */
+};
+
+#pragma pack()
+
+unsigned int sis_ctrl_ready_timeout_secs = SIS_CTRL_READY_TIMEOUT_SECS;
+
+static int sis_wait_for_ctrl_ready_with_timeout(struct pqi_ctrl_info *ctrl_info,
+ unsigned int timeout_secs)
+{
+ unsigned long timeout;
+ u32 status;
+
+ timeout = (timeout_secs * HZ) + jiffies;
+
+ while (1) {
+ status = readl(&ctrl_info->registers->sis_firmware_status);
+ if (status != ~0) {
+ if (status & SIS_CTRL_KERNEL_PANIC) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "controller is offline: status code 0x%x\n",
+ readl(
+ &ctrl_info->registers->sis_mailbox[7]));
+ return -ENODEV;
+ }
+ if (status & SIS_CTRL_KERNEL_UP)
+ break;
+ }
+ if (time_after(jiffies, timeout)) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "controller not ready after %u seconds\n",
+ timeout_secs);
+ return -ETIMEDOUT;
+ }
+ msleep(SIS_CTRL_READY_POLL_INTERVAL_MSECS);
+ }
+
+ return 0;
+}
+
+int sis_wait_for_ctrl_ready(struct pqi_ctrl_info *ctrl_info)
+{
+ return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
+ sis_ctrl_ready_timeout_secs);
+}
+
+int sis_wait_for_ctrl_ready_resume(struct pqi_ctrl_info *ctrl_info)
+{
+ return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
+ SIS_CTRL_READY_RESUME_TIMEOUT_SECS);
+}
+
+bool sis_is_firmware_running(struct pqi_ctrl_info *ctrl_info)
+{
+ bool running;
+ u32 status;
+
+ status = readl(&ctrl_info->registers->sis_firmware_status);
+
+ if (status != ~0 && (status & SIS_CTRL_KERNEL_PANIC))
+ running = false;
+ else
+ running = true;
+
+ if (!running)
+ dev_err(&ctrl_info->pci_dev->dev,
+ "controller is offline: status code 0x%x\n",
+ readl(&ctrl_info->registers->sis_mailbox[7]));
+
+ return running;
+}
+
+bool sis_is_kernel_up(struct pqi_ctrl_info *ctrl_info)
+{
+ return readl(&ctrl_info->registers->sis_firmware_status) &
+ SIS_CTRL_KERNEL_UP;
+}
+
+u32 sis_get_product_id(struct pqi_ctrl_info *ctrl_info)
+{
+ return readl(&ctrl_info->registers->sis_product_identifier);
+}
+
+/* used for passing command parameters/results when issuing SIS commands */
+struct sis_sync_cmd_params {
+ u32 mailbox[6]; /* mailboxes 0-5 */
+};
+
+static int sis_send_sync_cmd(struct pqi_ctrl_info *ctrl_info,
+ u32 cmd, struct sis_sync_cmd_params *params)
+{
+ struct pqi_ctrl_registers __iomem *registers;
+ unsigned int i;
+ unsigned long timeout;
+ u32 doorbell;
+ u32 cmd_status;
+
+ registers = ctrl_info->registers;
+
+ /* Write the command to mailbox 0. */
+ writel(cmd, &registers->sis_mailbox[0]);
+
+ /*
+ * Write the command parameters to mailboxes 1-4 (mailbox 5 is not used
+ * when sending a command to the controller).
+ */
+ for (i = 1; i <= 4; i++)
+ writel(params->mailbox[i], &registers->sis_mailbox[i]);
+
+ /* Clear the command doorbell. */
+ writel(SIS_CLEAR_CTRL_TO_HOST_DOORBELL,
+ &registers->sis_ctrl_to_host_doorbell_clear);
+
+ /* Disable doorbell interrupts by masking all interrupts. */
+ writel(~0, &registers->sis_interrupt_mask);
+ usleep_range(1000, 2000);
+
+ /*
+ * Force the completion of the interrupt mask register write before
+ * submitting the command.
+ */
+ readl(&registers->sis_interrupt_mask);
+
+ /* Submit the command to the controller. */
+ writel(SIS_CMD_READY, &registers->sis_host_to_ctrl_doorbell);
+
+ /*
+ * Poll for command completion. Note that the call to msleep() is at
+ * the top of the loop in order to give the controller time to start
+ * processing the command before we start polling.
+ */
+ timeout = (SIS_CMD_COMPLETE_TIMEOUT_SECS * HZ) + jiffies;
+ while (1) {
+ msleep(SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS);
+ doorbell = readl(&registers->sis_ctrl_to_host_doorbell);
+ if (doorbell & SIS_CMD_COMPLETE)
+ break;
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+ }
+
+ /* Read the command status from mailbox 0. */
+ cmd_status = readl(&registers->sis_mailbox[0]);
+ if (cmd_status != SIS_CMD_STATUS_SUCCESS) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "SIS command failed for command 0x%x: status = 0x%x\n",
+ cmd, cmd_status);
+ return -EINVAL;
+ }
+
+ /*
+ * The command completed successfully, so save the command status and
+ * read the values returned in mailboxes 1-5.
+ */
+ params->mailbox[0] = cmd_status;
+ for (i = 1; i < ARRAY_SIZE(params->mailbox); i++)
+ params->mailbox[i] = readl(&registers->sis_mailbox[i]);
+
+ return 0;
+}
+
+/*
+ * This function verifies that we are talking to a controller that speaks PQI.
+ */
+
+int sis_get_ctrl_properties(struct pqi_ctrl_info *ctrl_info)
+{
+ int rc;
+ u32 properties;
+ u32 extended_properties;
+ struct sis_sync_cmd_params params;
+
+ memset(&params, 0, sizeof(params));
+
+ rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_ADAPTER_PROPERTIES,
+ &params);
+ if (rc)
+ return rc;
+
+ properties = params.mailbox[1];
+
+ if (!(properties & SIS_EXTENDED_PROPERTIES_SUPPORTED))
+ return -ENODEV;
+
+ extended_properties = params.mailbox[4];
+
+ if ((extended_properties & SIS_REQUIRED_EXTENDED_PROPERTIES) !=
+ SIS_REQUIRED_EXTENDED_PROPERTIES)
+ return -ENODEV;
+
+ if (extended_properties & SIS_PQI_RESET_QUIESCE_SUPPORTED)
+ ctrl_info->pqi_reset_quiesce_supported = true;
+
+ return 0;
+}
+
+int sis_get_pqi_capabilities(struct pqi_ctrl_info *ctrl_info)
+{
+ int rc;
+ struct sis_sync_cmd_params params;
+
+ memset(&params, 0, sizeof(params));
+
+ rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_PQI_CAPABILITIES,
+ &params);
+ if (rc)
+ return rc;
+
+ ctrl_info->max_sg_entries = params.mailbox[1];
+ ctrl_info->max_transfer_size = params.mailbox[2];
+ ctrl_info->max_outstanding_requests = params.mailbox[3];
+ ctrl_info->config_table_offset = params.mailbox[4];
+ ctrl_info->config_table_length = params.mailbox[5];
+
+ return 0;
+}
+
+int sis_init_base_struct_addr(struct pqi_ctrl_info *ctrl_info)
+{
+ int rc;
+ void *base_struct_unaligned;
+ struct sis_base_struct *base_struct;
+ struct sis_sync_cmd_params params;
+ unsigned long error_buffer_paddr;
+ dma_addr_t bus_address;
+
+ base_struct_unaligned = kzalloc(sizeof(*base_struct)
+ + SIS_BASE_STRUCT_ALIGNMENT - 1, GFP_KERNEL);
+ if (!base_struct_unaligned)
+ return -ENOMEM;
+
+ base_struct = PTR_ALIGN(base_struct_unaligned,
+ SIS_BASE_STRUCT_ALIGNMENT);
+ error_buffer_paddr = (unsigned long)ctrl_info->error_buffer_dma_handle;
+
+ put_unaligned_le32(SIS_BASE_STRUCT_REVISION, &base_struct->revision);
+ put_unaligned_le32(lower_32_bits(error_buffer_paddr),
+ &base_struct->error_buffer_paddr_low);
+ put_unaligned_le32(upper_32_bits(error_buffer_paddr),
+ &base_struct->error_buffer_paddr_high);
+ put_unaligned_le32(PQI_ERROR_BUFFER_ELEMENT_LENGTH,
+ &base_struct->error_buffer_element_length);
+ put_unaligned_le32(ctrl_info->max_io_slots,
+ &base_struct->error_buffer_num_elements);
+
+ bus_address = dma_map_single(&ctrl_info->pci_dev->dev, base_struct,
+ sizeof(*base_struct), DMA_TO_DEVICE);
+ if (dma_mapping_error(&ctrl_info->pci_dev->dev, bus_address)) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ memset(&params, 0, sizeof(params));
+ params.mailbox[1] = lower_32_bits((u64)bus_address);
+ params.mailbox[2] = upper_32_bits((u64)bus_address);
+ params.mailbox[3] = sizeof(*base_struct);
+
+ rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_INIT_BASE_STRUCT_ADDRESS,
+ &params);
+
+ dma_unmap_single(&ctrl_info->pci_dev->dev, bus_address,
+ sizeof(*base_struct), DMA_TO_DEVICE);
+out:
+ kfree(base_struct_unaligned);
+
+ return rc;
+}
+
+#define SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS 30
+
+static int sis_wait_for_doorbell_bit_to_clear(
+ struct pqi_ctrl_info *ctrl_info, u32 bit)
+{
+ int rc = 0;
+ u32 doorbell_register;
+ unsigned long timeout;
+
+ timeout = (SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS * HZ) + jiffies;
+
+ while (1) {
+ doorbell_register =
+ readl(&ctrl_info->registers->sis_host_to_ctrl_doorbell);
+ if ((doorbell_register & bit) == 0)
+ break;
+ if (readl(&ctrl_info->registers->sis_firmware_status) &
+ SIS_CTRL_KERNEL_PANIC) {
+ rc = -ENODEV;
+ break;
+ }
+ if (time_after(jiffies, timeout)) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "doorbell register bit 0x%x not cleared\n",
+ bit);
+ rc = -ETIMEDOUT;
+ break;
+ }
+ usleep_range(1000, 2000);
+ }
+
+ return rc;
+}
+
+static inline int sis_set_doorbell_bit(struct pqi_ctrl_info *ctrl_info, u32 bit)
+{
+ writel(bit, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
+ usleep_range(1000, 2000);
+
+ return sis_wait_for_doorbell_bit_to_clear(ctrl_info, bit);
+}
+
+void sis_enable_msix(struct pqi_ctrl_info *ctrl_info)
+{
+ sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_MSIX);
+}
+
+void sis_enable_intx(struct pqi_ctrl_info *ctrl_info)
+{
+ sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_INTX);
+}
+
+void sis_shutdown_ctrl(struct pqi_ctrl_info *ctrl_info,
+ enum pqi_ctrl_shutdown_reason ctrl_shutdown_reason)
+{
+ if (readl(&ctrl_info->registers->sis_firmware_status) &
+ SIS_CTRL_KERNEL_PANIC)
+ return;
+
+ if (ctrl_info->firmware_triage_supported)
+ writel(ctrl_shutdown_reason, &ctrl_info->registers->sis_ctrl_shutdown_reason_code);
+
+ writel(SIS_TRIGGER_SHUTDOWN, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
+}
+
+int sis_pqi_reset_quiesce(struct pqi_ctrl_info *ctrl_info)
+{
+ return sis_set_doorbell_bit(ctrl_info, SIS_PQI_RESET_QUIESCE);
+}
+
+int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
+{
+ return sis_set_doorbell_bit(ctrl_info, SIS_REENABLE_SIS_MODE);
+}
+
+void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
+{
+ writel(value, &ctrl_info->registers->sis_driver_scratch);
+ usleep_range(1000, 2000);
+}
+
+u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
+{
+ return readl(&ctrl_info->registers->sis_driver_scratch);
+}
+
+static inline enum sis_fw_triage_status
+ sis_read_firmware_triage_status(struct pqi_ctrl_info *ctrl_info)
+{
+ return ((enum sis_fw_triage_status)(readl(&ctrl_info->registers->sis_firmware_status) &
+ SIS_CTRL_KERNEL_FW_TRIAGE));
+}
+
+void sis_soft_reset(struct pqi_ctrl_info *ctrl_info)
+{
+ writel(SIS_SOFT_RESET,
+ &ctrl_info->registers->sis_host_to_ctrl_doorbell);
+}
+
+#define SIS_FW_TRIAGE_STATUS_TIMEOUT_SECS 300
+#define SIS_FW_TRIAGE_STATUS_POLL_INTERVAL_SECS 1
+
+int sis_wait_for_fw_triage_completion(struct pqi_ctrl_info *ctrl_info)
+{
+ int rc;
+ enum sis_fw_triage_status status;
+ unsigned long timeout;
+
+ timeout = (SIS_FW_TRIAGE_STATUS_TIMEOUT_SECS * HZ) + jiffies;
+ while (1) {
+ status = sis_read_firmware_triage_status(ctrl_info);
+ if (status == FW_TRIAGE_COND_INVALID) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "firmware triage condition invalid\n");
+ rc = -EINVAL;
+ break;
+ } else if (status == FW_TRIAGE_NOT_STARTED ||
+ status == FW_TRIAGE_COMPLETED) {
+ rc = 0;
+ break;
+ }
+
+ if (time_after(jiffies, timeout)) {
+ dev_err(&ctrl_info->pci_dev->dev,
+ "timed out waiting for firmware triage status\n");
+ rc = -ETIMEDOUT;
+ break;
+ }
+
+ ssleep(SIS_FW_TRIAGE_STATUS_POLL_INTERVAL_SECS);
+ }
+
+ return rc;
+}
+
+void sis_verify_structures(void)
+{
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ revision) != 0x0);
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ flags) != 0x4);
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ error_buffer_paddr_low) != 0x8);
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ error_buffer_paddr_high) != 0xc);
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ error_buffer_element_length) != 0x10);
+ BUILD_BUG_ON(offsetof(struct sis_base_struct,
+ error_buffer_num_elements) != 0x14);
+ BUILD_BUG_ON(sizeof(struct sis_base_struct) != 0x18);
+}