298 lines
8.4 KiB
C
298 lines
8.4 KiB
C
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// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
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/*
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* Copyright 2013-2016 Freescale Semiconductor Inc.
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*
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* I/O services to send MC commands to the MC hardware
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*
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*/
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/io-64-nonatomic-hi-lo.h>
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#include <linux/fsl/mc.h>
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#include "fsl-mc-private.h"
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/*
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* Timeout in milliseconds to wait for the completion of an MC command
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*/
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#define MC_CMD_COMPLETION_TIMEOUT_MS 500
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/*
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* usleep_range() min and max values used to throttle down polling
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* iterations while waiting for MC command completion
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*/
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#define MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS 10
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#define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500
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static enum mc_cmd_status mc_cmd_hdr_read_status(struct fsl_mc_command *cmd)
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{
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struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
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return (enum mc_cmd_status)hdr->status;
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}
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u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd)
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{
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struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
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u16 cmd_id = le16_to_cpu(hdr->cmd_id);
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return cmd_id;
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}
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static int mc_status_to_error(enum mc_cmd_status status)
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{
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static const int mc_status_to_error_map[] = {
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[MC_CMD_STATUS_OK] = 0,
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[MC_CMD_STATUS_AUTH_ERR] = -EACCES,
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[MC_CMD_STATUS_NO_PRIVILEGE] = -EPERM,
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[MC_CMD_STATUS_DMA_ERR] = -EIO,
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[MC_CMD_STATUS_CONFIG_ERR] = -ENXIO,
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[MC_CMD_STATUS_TIMEOUT] = -ETIMEDOUT,
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[MC_CMD_STATUS_NO_RESOURCE] = -ENAVAIL,
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[MC_CMD_STATUS_NO_MEMORY] = -ENOMEM,
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[MC_CMD_STATUS_BUSY] = -EBUSY,
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[MC_CMD_STATUS_UNSUPPORTED_OP] = -ENOTSUPP,
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[MC_CMD_STATUS_INVALID_STATE] = -ENODEV,
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};
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if ((u32)status >= ARRAY_SIZE(mc_status_to_error_map))
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return -EINVAL;
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return mc_status_to_error_map[status];
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}
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static const char *mc_status_to_string(enum mc_cmd_status status)
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{
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static const char *const status_strings[] = {
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[MC_CMD_STATUS_OK] = "Command completed successfully",
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[MC_CMD_STATUS_READY] = "Command ready to be processed",
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[MC_CMD_STATUS_AUTH_ERR] = "Authentication error",
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[MC_CMD_STATUS_NO_PRIVILEGE] = "No privilege",
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[MC_CMD_STATUS_DMA_ERR] = "DMA or I/O error",
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[MC_CMD_STATUS_CONFIG_ERR] = "Configuration error",
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[MC_CMD_STATUS_TIMEOUT] = "Operation timed out",
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[MC_CMD_STATUS_NO_RESOURCE] = "No resources",
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[MC_CMD_STATUS_NO_MEMORY] = "No memory available",
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[MC_CMD_STATUS_BUSY] = "Device is busy",
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[MC_CMD_STATUS_UNSUPPORTED_OP] = "Unsupported operation",
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[MC_CMD_STATUS_INVALID_STATE] = "Invalid state"
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};
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if ((unsigned int)status >= ARRAY_SIZE(status_strings))
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return "Unknown MC error";
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return status_strings[status];
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}
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/**
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* mc_write_command - writes a command to a Management Complex (MC) portal
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*
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* @portal: pointer to an MC portal
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* @cmd: pointer to a filled command
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*/
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static inline void mc_write_command(struct fsl_mc_command __iomem *portal,
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struct fsl_mc_command *cmd)
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{
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int i;
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/* copy command parameters into the portal */
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for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
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/*
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* Data is already in the expected LE byte-order. Do an
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* extra LE -> CPU conversion so that the CPU -> LE done in
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* the device io write api puts it back in the right order.
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*/
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writeq_relaxed(le64_to_cpu(cmd->params[i]), &portal->params[i]);
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/* submit the command by writing the header */
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writeq(le64_to_cpu(cmd->header), &portal->header);
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}
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/**
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* mc_read_response - reads the response for the last MC command from a
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* Management Complex (MC) portal
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*
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* @portal: pointer to an MC portal
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* @resp: pointer to command response buffer
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*
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* Returns MC_CMD_STATUS_OK on Success; Error code otherwise.
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*/
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static inline enum mc_cmd_status mc_read_response(struct fsl_mc_command __iomem
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*portal,
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struct fsl_mc_command *resp)
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{
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int i;
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enum mc_cmd_status status;
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/* Copy command response header from MC portal: */
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resp->header = cpu_to_le64(readq_relaxed(&portal->header));
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status = mc_cmd_hdr_read_status(resp);
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if (status != MC_CMD_STATUS_OK)
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return status;
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/* Copy command response data from MC portal: */
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for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
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/*
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* Data is expected to be in LE byte-order. Do an
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* extra CPU -> LE to revert the LE -> CPU done in
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* the device io read api.
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*/
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resp->params[i] =
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cpu_to_le64(readq_relaxed(&portal->params[i]));
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return status;
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}
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/**
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* mc_polling_wait_preemptible() - Waits for the completion of an MC
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* command doing preemptible polling.
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* uslepp_range() is called between
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* polling iterations.
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* @mc_io: MC I/O object to be used
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* @cmd: command buffer to receive MC response
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* @mc_status: MC command completion status
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*/
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static int mc_polling_wait_preemptible(struct fsl_mc_io *mc_io,
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struct fsl_mc_command *cmd,
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enum mc_cmd_status *mc_status)
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{
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enum mc_cmd_status status;
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unsigned long jiffies_until_timeout =
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jiffies + msecs_to_jiffies(MC_CMD_COMPLETION_TIMEOUT_MS);
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/*
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* Wait for response from the MC hardware:
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*/
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for (;;) {
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status = mc_read_response(mc_io->portal_virt_addr, cmd);
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if (status != MC_CMD_STATUS_READY)
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break;
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/*
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* TODO: When MC command completion interrupts are supported
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* call wait function here instead of usleep_range()
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*/
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usleep_range(MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS,
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MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
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if (time_after_eq(jiffies, jiffies_until_timeout)) {
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dev_dbg(mc_io->dev,
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"MC command timed out (portal: %pa, dprc handle: %#x, command: %#x)\n",
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&mc_io->portal_phys_addr,
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(unsigned int)mc_cmd_hdr_read_token(cmd),
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(unsigned int)mc_cmd_hdr_read_cmdid(cmd));
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return -ETIMEDOUT;
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}
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}
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*mc_status = status;
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return 0;
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}
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/**
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* mc_polling_wait_atomic() - Waits for the completion of an MC command
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* doing atomic polling. udelay() is called
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* between polling iterations.
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* @mc_io: MC I/O object to be used
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* @cmd: command buffer to receive MC response
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* @mc_status: MC command completion status
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*/
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static int mc_polling_wait_atomic(struct fsl_mc_io *mc_io,
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struct fsl_mc_command *cmd,
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enum mc_cmd_status *mc_status)
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{
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enum mc_cmd_status status;
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unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
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BUILD_BUG_ON((MC_CMD_COMPLETION_TIMEOUT_MS * 1000) %
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MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS != 0);
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for (;;) {
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status = mc_read_response(mc_io->portal_virt_addr, cmd);
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if (status != MC_CMD_STATUS_READY)
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break;
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udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
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timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS;
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if (timeout_usecs == 0) {
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dev_dbg(mc_io->dev,
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"MC command timed out (portal: %pa, dprc handle: %#x, command: %#x)\n",
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&mc_io->portal_phys_addr,
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(unsigned int)mc_cmd_hdr_read_token(cmd),
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(unsigned int)mc_cmd_hdr_read_cmdid(cmd));
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return -ETIMEDOUT;
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}
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}
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*mc_status = status;
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return 0;
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}
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/**
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* mc_send_command() - Sends a command to the MC device using the given
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* MC I/O object
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* @mc_io: MC I/O object to be used
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* @cmd: command to be sent
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*
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* Returns '0' on Success; Error code otherwise.
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*/
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int mc_send_command(struct fsl_mc_io *mc_io, struct fsl_mc_command *cmd)
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{
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int error;
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enum mc_cmd_status status;
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unsigned long irq_flags = 0;
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if (in_irq() && !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
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return -EINVAL;
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if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
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raw_spin_lock_irqsave(&mc_io->spinlock, irq_flags);
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else
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mutex_lock(&mc_io->mutex);
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/*
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* Send command to the MC hardware:
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*/
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mc_write_command(mc_io->portal_virt_addr, cmd);
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/*
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* Wait for response from the MC hardware:
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*/
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if (!(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
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error = mc_polling_wait_preemptible(mc_io, cmd, &status);
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else
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error = mc_polling_wait_atomic(mc_io, cmd, &status);
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if (error < 0)
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goto common_exit;
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if (status != MC_CMD_STATUS_OK) {
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dev_dbg(mc_io->dev,
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"MC command failed: portal: %pa, dprc handle: %#x, command: %#x, status: %s (%#x)\n",
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&mc_io->portal_phys_addr,
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(unsigned int)mc_cmd_hdr_read_token(cmd),
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(unsigned int)mc_cmd_hdr_read_cmdid(cmd),
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mc_status_to_string(status),
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(unsigned int)status);
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error = mc_status_to_error(status);
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goto common_exit;
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}
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error = 0;
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common_exit:
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if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
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raw_spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
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else
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mutex_unlock(&mc_io->mutex);
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return error;
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}
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EXPORT_SYMBOL_GPL(mc_send_command);
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