| /* Copyright 2013-2014 Freescale Semiconductor Inc. |
| * |
| * I/O services to send MC commands to the MC hardware |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * * Neither the name of the above-listed copyright holders nor the |
| * names of any contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * |
| * ALTERNATIVELY, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") as published by the Free Software |
| * Foundation, either version 2 of that License or (at your option) any |
| * later version. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "../include/mc-sys.h" |
| #include "../include/mc-cmd.h" |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/ioport.h> |
| #include <linux/device.h> |
| |
| /** |
| * Timeout in jiffies to wait for the completion of an MC command |
| */ |
| #define MC_CMD_COMPLETION_TIMEOUT_JIFFIES (HZ / 2) /* 500 ms */ |
| |
| /* |
| * usleep_range() min and max values used to throttle down polling |
| * iterations while waiting for MC command completion |
| */ |
| #define MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS 10 |
| #define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500 |
| |
| #define MC_CMD_HDR_READ_CMDID(_hdr) \ |
| ((uint16_t)mc_dec((_hdr), MC_CMD_HDR_CMDID_O, MC_CMD_HDR_CMDID_S)) |
| |
| /** |
| * Creates an MC I/O object |
| * |
| * @dev: device to be associated with the MC I/O object |
| * @mc_portal_phys_addr: physical address of the MC portal to use |
| * @mc_portal_size: size in bytes of the MC portal |
| * @resource: Pointer to MC bus object allocator resource associated |
| * with this MC I/O object or NULL if none. |
| * @flags: flags for the new MC I/O object |
| * @new_mc_io: Area to return pointer to newly created MC I/O object |
| * |
| * Returns '0' on Success; Error code otherwise. |
| */ |
| int __must_check fsl_create_mc_io(struct device *dev, |
| phys_addr_t mc_portal_phys_addr, |
| uint32_t mc_portal_size, |
| struct fsl_mc_resource *resource, |
| uint32_t flags, struct fsl_mc_io **new_mc_io) |
| { |
| struct fsl_mc_io *mc_io; |
| void __iomem *mc_portal_virt_addr; |
| struct resource *res; |
| |
| mc_io = devm_kzalloc(dev, sizeof(*mc_io), GFP_KERNEL); |
| if (!mc_io) |
| return -ENOMEM; |
| |
| mc_io->dev = dev; |
| mc_io->flags = flags; |
| mc_io->portal_phys_addr = mc_portal_phys_addr; |
| mc_io->portal_size = mc_portal_size; |
| mc_io->resource = resource; |
| res = devm_request_mem_region(dev, |
| mc_portal_phys_addr, |
| mc_portal_size, |
| "mc_portal"); |
| if (!res) { |
| dev_err(dev, |
| "devm_request_mem_region failed for MC portal %#llx\n", |
| mc_portal_phys_addr); |
| return -EBUSY; |
| } |
| |
| mc_portal_virt_addr = devm_ioremap_nocache(dev, |
| mc_portal_phys_addr, |
| mc_portal_size); |
| if (!mc_portal_virt_addr) { |
| dev_err(dev, |
| "devm_ioremap_nocache failed for MC portal %#llx\n", |
| mc_portal_phys_addr); |
| return -ENXIO; |
| } |
| |
| mc_io->portal_virt_addr = mc_portal_virt_addr; |
| *new_mc_io = mc_io; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(fsl_create_mc_io); |
| |
| /** |
| * Destroys an MC I/O object |
| * |
| * @mc_io: MC I/O object to destroy |
| */ |
| void fsl_destroy_mc_io(struct fsl_mc_io *mc_io) |
| { |
| devm_iounmap(mc_io->dev, mc_io->portal_virt_addr); |
| devm_release_mem_region(mc_io->dev, |
| mc_io->portal_phys_addr, |
| mc_io->portal_size); |
| |
| mc_io->portal_virt_addr = NULL; |
| devm_kfree(mc_io->dev, mc_io); |
| } |
| EXPORT_SYMBOL_GPL(fsl_destroy_mc_io); |
| |
| static int mc_status_to_error(enum mc_cmd_status status) |
| { |
| static const int mc_status_to_error_map[] = { |
| [MC_CMD_STATUS_OK] = 0, |
| [MC_CMD_STATUS_AUTH_ERR] = -EACCES, |
| [MC_CMD_STATUS_NO_PRIVILEGE] = -EPERM, |
| [MC_CMD_STATUS_DMA_ERR] = -EIO, |
| [MC_CMD_STATUS_CONFIG_ERR] = -ENXIO, |
| [MC_CMD_STATUS_TIMEOUT] = -ETIMEDOUT, |
| [MC_CMD_STATUS_NO_RESOURCE] = -ENAVAIL, |
| [MC_CMD_STATUS_NO_MEMORY] = -ENOMEM, |
| [MC_CMD_STATUS_BUSY] = -EBUSY, |
| [MC_CMD_STATUS_UNSUPPORTED_OP] = -ENOTSUPP, |
| [MC_CMD_STATUS_INVALID_STATE] = -ENODEV, |
| }; |
| |
| if (WARN_ON((u32)status >= ARRAY_SIZE(mc_status_to_error_map))) |
| return -EINVAL; |
| |
| return mc_status_to_error_map[status]; |
| } |
| |
| static const char *mc_status_to_string(enum mc_cmd_status status) |
| { |
| static const char *const status_strings[] = { |
| [MC_CMD_STATUS_OK] = "Command completed successfully", |
| [MC_CMD_STATUS_READY] = "Command ready to be processed", |
| [MC_CMD_STATUS_AUTH_ERR] = "Authentication error", |
| [MC_CMD_STATUS_NO_PRIVILEGE] = "No privilege", |
| [MC_CMD_STATUS_DMA_ERR] = "DMA or I/O error", |
| [MC_CMD_STATUS_CONFIG_ERR] = "Configuration error", |
| [MC_CMD_STATUS_TIMEOUT] = "Operation timed out", |
| [MC_CMD_STATUS_NO_RESOURCE] = "No resources", |
| [MC_CMD_STATUS_NO_MEMORY] = "No memory available", |
| [MC_CMD_STATUS_BUSY] = "Device is busy", |
| [MC_CMD_STATUS_UNSUPPORTED_OP] = "Unsupported operation", |
| [MC_CMD_STATUS_INVALID_STATE] = "Invalid state" |
| }; |
| |
| if ((unsigned int)status >= ARRAY_SIZE(status_strings)) |
| return "Unknown MC error"; |
| |
| return status_strings[status]; |
| } |
| |
| /** |
| * mc_write_command - writes a command to a Management Complex (MC) portal |
| * |
| * @portal: pointer to an MC portal |
| * @cmd: pointer to a filled command |
| */ |
| static inline void mc_write_command(struct mc_command __iomem *portal, |
| struct mc_command *cmd) |
| { |
| int i; |
| |
| /* copy command parameters into the portal */ |
| for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++) |
| writeq(cmd->params[i], &portal->params[i]); |
| |
| /* submit the command by writing the header */ |
| writeq(cmd->header, &portal->header); |
| } |
| |
| /** |
| * mc_read_response - reads the response for the last MC command from a |
| * Management Complex (MC) portal |
| * |
| * @portal: pointer to an MC portal |
| * @resp: pointer to command response buffer |
| * |
| * Returns MC_CMD_STATUS_OK on Success; Error code otherwise. |
| */ |
| static inline enum mc_cmd_status mc_read_response(struct mc_command __iomem * |
| portal, |
| struct mc_command *resp) |
| { |
| int i; |
| enum mc_cmd_status status; |
| |
| /* Copy command response header from MC portal: */ |
| resp->header = readq(&portal->header); |
| status = MC_CMD_HDR_READ_STATUS(resp->header); |
| if (status != MC_CMD_STATUS_OK) |
| return status; |
| |
| /* Copy command response data from MC portal: */ |
| for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++) |
| resp->params[i] = readq(&portal->params[i]); |
| |
| return status; |
| } |
| |
| /** |
| * Sends an command to the MC device using the given MC I/O object |
| * |
| * @mc_io: MC I/O object to be used |
| * @cmd: command to be sent |
| * |
| * Returns '0' on Success; Error code otherwise. |
| * |
| * NOTE: This function cannot be invoked from from atomic contexts. |
| */ |
| int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd) |
| { |
| enum mc_cmd_status status; |
| unsigned long jiffies_until_timeout = |
| jiffies + MC_CMD_COMPLETION_TIMEOUT_JIFFIES; |
| |
| /* |
| * Send command to the MC hardware: |
| */ |
| mc_write_command(mc_io->portal_virt_addr, cmd); |
| |
| /* |
| * Wait for response from the MC hardware: |
| */ |
| for (;;) { |
| status = mc_read_response(mc_io->portal_virt_addr, cmd); |
| if (status != MC_CMD_STATUS_READY) |
| break; |
| |
| /* |
| * TODO: When MC command completion interrupts are supported |
| * call wait function here instead of usleep_range() |
| */ |
| usleep_range(MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS, |
| MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS); |
| |
| if (time_after_eq(jiffies, jiffies_until_timeout)) { |
| pr_debug("MC command timed out (portal: %#llx, obj handle: %#x, command: %#x)\n", |
| mc_io->portal_phys_addr, |
| (unsigned int) |
| MC_CMD_HDR_READ_TOKEN(cmd->header), |
| (unsigned int) |
| MC_CMD_HDR_READ_CMDID(cmd->header)); |
| |
| return -ETIMEDOUT; |
| } |
| } |
| |
| if (status != MC_CMD_STATUS_OK) { |
| pr_debug("MC command failed: portal: %#llx, obj handle: %#x, command: %#x, status: %s (%#x)\n", |
| mc_io->portal_phys_addr, |
| (unsigned int)MC_CMD_HDR_READ_TOKEN(cmd->header), |
| (unsigned int)MC_CMD_HDR_READ_CMDID(cmd->header), |
| mc_status_to_string(status), |
| (unsigned int)status); |
| |
| return mc_status_to_error(status); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mc_send_command); |