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Based on 1 normalized pattern(s): licensed under the terms of the gnu general public license version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 88 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000437.521539229@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
403 lines
10 KiB
C
403 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Function Control Protocol (IEC 61883-1) helper functions
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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*/
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#include <linux/device.h>
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#include <linux/firewire.h>
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#include <linux/firewire-constants.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/delay.h>
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#include "fcp.h"
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#include "lib.h"
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#include "amdtp-stream.h"
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#define CTS_AVC 0x00
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#define ERROR_RETRIES 3
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#define ERROR_DELAY_MS 5
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#define FCP_TIMEOUT_MS 125
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int avc_general_set_sig_fmt(struct fw_unit *unit, unsigned int rate,
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enum avc_general_plug_dir dir,
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unsigned short pid)
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{
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unsigned int sfc;
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u8 *buf;
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bool flag;
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int err;
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flag = false;
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for (sfc = 0; sfc < CIP_SFC_COUNT; sfc++) {
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if (amdtp_rate_table[sfc] == rate) {
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flag = true;
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break;
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}
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}
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if (!flag)
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return -EINVAL;
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buf = kzalloc(8, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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buf[0] = 0x00; /* AV/C CONTROL */
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buf[1] = 0xff; /* UNIT */
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if (dir == AVC_GENERAL_PLUG_DIR_IN)
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buf[2] = 0x19; /* INPUT PLUG SIGNAL FORMAT */
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else
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buf[2] = 0x18; /* OUTPUT PLUG SIGNAL FORMAT */
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buf[3] = 0xff & pid; /* plug id */
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buf[4] = 0x90; /* EOH_1, Form_1, FMT. AM824 */
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buf[5] = 0x07 & sfc; /* FDF-hi. AM824, frequency */
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buf[6] = 0xff; /* FDF-mid. AM824, SYT hi (not used)*/
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buf[7] = 0xff; /* FDF-low. AM824, SYT lo (not used) */
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/* do transaction and check buf[1-5] are the same against command */
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err = fcp_avc_transaction(unit, buf, 8, buf, 8,
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BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5));
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if (err < 0)
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;
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else if (err < 8)
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err = -EIO;
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else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
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err = -ENOSYS;
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else if (buf[0] == 0x0a) /* REJECTED */
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err = -EINVAL;
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if (err < 0)
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goto end;
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err = 0;
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end:
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kfree(buf);
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return err;
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}
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EXPORT_SYMBOL(avc_general_set_sig_fmt);
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int avc_general_get_sig_fmt(struct fw_unit *unit, unsigned int *rate,
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enum avc_general_plug_dir dir,
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unsigned short pid)
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{
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unsigned int sfc;
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u8 *buf;
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int err;
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buf = kzalloc(8, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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buf[0] = 0x01; /* AV/C STATUS */
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buf[1] = 0xff; /* Unit */
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if (dir == AVC_GENERAL_PLUG_DIR_IN)
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buf[2] = 0x19; /* INPUT PLUG SIGNAL FORMAT */
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else
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buf[2] = 0x18; /* OUTPUT PLUG SIGNAL FORMAT */
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buf[3] = 0xff & pid; /* plug id */
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buf[4] = 0x90; /* EOH_1, Form_1, FMT. AM824 */
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buf[5] = 0xff; /* FDF-hi. AM824, frequency */
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buf[6] = 0xff; /* FDF-mid. AM824, SYT hi (not used) */
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buf[7] = 0xff; /* FDF-low. AM824, SYT lo (not used) */
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/* do transaction and check buf[1-4] are the same against command */
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err = fcp_avc_transaction(unit, buf, 8, buf, 8,
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BIT(1) | BIT(2) | BIT(3) | BIT(4));
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if (err < 0)
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;
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else if (err < 8)
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err = -EIO;
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else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
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err = -ENOSYS;
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else if (buf[0] == 0x0a) /* REJECTED */
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err = -EINVAL;
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else if (buf[0] == 0x0b) /* IN TRANSITION */
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err = -EAGAIN;
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if (err < 0)
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goto end;
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/* check sfc field and pick up rate */
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sfc = 0x07 & buf[5];
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if (sfc >= CIP_SFC_COUNT) {
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err = -EAGAIN; /* also in transition */
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goto end;
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}
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*rate = amdtp_rate_table[sfc];
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err = 0;
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end:
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kfree(buf);
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return err;
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}
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EXPORT_SYMBOL(avc_general_get_sig_fmt);
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int avc_general_get_plug_info(struct fw_unit *unit, unsigned int subunit_type,
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unsigned int subunit_id, unsigned int subfunction,
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u8 info[AVC_PLUG_INFO_BUF_BYTES])
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{
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u8 *buf;
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int err;
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/* extended subunit in spec.4.2 is not supported */
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if ((subunit_type == 0x1E) || (subunit_id == 5))
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return -EINVAL;
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buf = kzalloc(8, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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buf[0] = 0x01; /* AV/C STATUS */
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/* UNIT or Subunit, Functionblock */
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buf[1] = ((subunit_type & 0x1f) << 3) | (subunit_id & 0x7);
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buf[2] = 0x02; /* PLUG INFO */
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buf[3] = 0xff & subfunction;
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err = fcp_avc_transaction(unit, buf, 8, buf, 8, BIT(1) | BIT(2));
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if (err < 0)
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;
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else if (err < 8)
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err = -EIO;
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else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
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err = -ENOSYS;
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else if (buf[0] == 0x0a) /* REJECTED */
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err = -EINVAL;
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else if (buf[0] == 0x0b) /* IN TRANSITION */
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err = -EAGAIN;
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if (err < 0)
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goto end;
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info[0] = buf[4];
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info[1] = buf[5];
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info[2] = buf[6];
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info[3] = buf[7];
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err = 0;
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end:
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kfree(buf);
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return err;
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}
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EXPORT_SYMBOL(avc_general_get_plug_info);
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static DEFINE_SPINLOCK(transactions_lock);
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static LIST_HEAD(transactions);
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enum fcp_state {
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STATE_PENDING,
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STATE_BUS_RESET,
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STATE_COMPLETE,
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STATE_DEFERRED,
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};
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struct fcp_transaction {
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struct list_head list;
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struct fw_unit *unit;
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void *response_buffer;
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unsigned int response_size;
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unsigned int response_match_bytes;
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enum fcp_state state;
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wait_queue_head_t wait;
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bool deferrable;
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};
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/**
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* fcp_avc_transaction - send an AV/C command and wait for its response
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* @unit: a unit on the target device
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* @command: a buffer containing the command frame; must be DMA-able
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* @command_size: the size of @command
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* @response: a buffer for the response frame
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* @response_size: the maximum size of @response
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* @response_match_bytes: a bitmap specifying the bytes used to detect the
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* correct response frame
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*
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* This function sends a FCP command frame to the target and waits for the
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* corresponding response frame to be returned.
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*
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* Because it is possible for multiple FCP transactions to be active at the
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* same time, the correct response frame is detected by the value of certain
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* bytes. These bytes must be set in @response before calling this function,
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* and the corresponding bits must be set in @response_match_bytes.
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*
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* @command and @response can point to the same buffer.
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*
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* Returns the actual size of the response frame, or a negative error code.
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*/
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int fcp_avc_transaction(struct fw_unit *unit,
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const void *command, unsigned int command_size,
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void *response, unsigned int response_size,
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unsigned int response_match_bytes)
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{
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struct fcp_transaction t;
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int tcode, ret, tries = 0;
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t.unit = unit;
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t.response_buffer = response;
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t.response_size = response_size;
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t.response_match_bytes = response_match_bytes;
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t.state = STATE_PENDING;
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init_waitqueue_head(&t.wait);
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if (*(const u8 *)command == 0x00 || *(const u8 *)command == 0x03)
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t.deferrable = true;
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spin_lock_irq(&transactions_lock);
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list_add_tail(&t.list, &transactions);
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spin_unlock_irq(&transactions_lock);
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for (;;) {
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tcode = command_size == 4 ? TCODE_WRITE_QUADLET_REQUEST
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: TCODE_WRITE_BLOCK_REQUEST;
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ret = snd_fw_transaction(t.unit, tcode,
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CSR_REGISTER_BASE + CSR_FCP_COMMAND,
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(void *)command, command_size, 0);
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if (ret < 0)
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break;
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deferred:
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wait_event_timeout(t.wait, t.state != STATE_PENDING,
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msecs_to_jiffies(FCP_TIMEOUT_MS));
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if (t.state == STATE_DEFERRED) {
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/*
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* 'AV/C General Specification' define no time limit
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* on command completion once an INTERIM response has
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* been sent. but we promise to finish this function
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* for a caller. Here we use FCP_TIMEOUT_MS for next
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* interval. This is not in the specification.
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*/
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t.state = STATE_PENDING;
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goto deferred;
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} else if (t.state == STATE_COMPLETE) {
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ret = t.response_size;
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break;
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} else if (t.state == STATE_BUS_RESET) {
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msleep(ERROR_DELAY_MS);
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} else if (++tries >= ERROR_RETRIES) {
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dev_err(&t.unit->device, "FCP command timed out\n");
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ret = -EIO;
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break;
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}
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}
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spin_lock_irq(&transactions_lock);
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list_del(&t.list);
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spin_unlock_irq(&transactions_lock);
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return ret;
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}
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EXPORT_SYMBOL(fcp_avc_transaction);
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/**
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* fcp_bus_reset - inform the target handler about a bus reset
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* @unit: the unit that might be used by fcp_avc_transaction()
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*
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* This function must be called from the driver's .update handler to inform
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* the FCP transaction handler that a bus reset has happened. Any pending FCP
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* transactions are retried.
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*/
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void fcp_bus_reset(struct fw_unit *unit)
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{
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struct fcp_transaction *t;
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spin_lock_irq(&transactions_lock);
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list_for_each_entry(t, &transactions, list) {
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if (t->unit == unit &&
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(t->state == STATE_PENDING ||
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t->state == STATE_DEFERRED)) {
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t->state = STATE_BUS_RESET;
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wake_up(&t->wait);
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}
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}
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spin_unlock_irq(&transactions_lock);
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}
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EXPORT_SYMBOL(fcp_bus_reset);
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/* checks whether the response matches the masked bytes in response_buffer */
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static bool is_matching_response(struct fcp_transaction *transaction,
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const void *response, size_t length)
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{
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const u8 *p1, *p2;
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unsigned int mask, i;
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p1 = response;
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p2 = transaction->response_buffer;
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mask = transaction->response_match_bytes;
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for (i = 0; ; ++i) {
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if ((mask & 1) && p1[i] != p2[i])
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return false;
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mask >>= 1;
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if (!mask)
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return true;
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if (--length == 0)
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return false;
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}
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}
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static void fcp_response(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source,
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int generation, unsigned long long offset,
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void *data, size_t length, void *callback_data)
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{
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struct fcp_transaction *t;
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unsigned long flags;
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if (length < 1 || (*(const u8 *)data & 0xf0) != CTS_AVC)
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return;
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spin_lock_irqsave(&transactions_lock, flags);
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list_for_each_entry(t, &transactions, list) {
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struct fw_device *device = fw_parent_device(t->unit);
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if (device->card != card ||
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device->generation != generation)
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continue;
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smp_rmb(); /* node_id vs. generation */
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if (device->node_id != source)
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continue;
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if (t->state == STATE_PENDING &&
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is_matching_response(t, data, length)) {
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if (t->deferrable && *(const u8 *)data == 0x0f) {
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t->state = STATE_DEFERRED;
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} else {
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t->state = STATE_COMPLETE;
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t->response_size = min_t(unsigned int, length,
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t->response_size);
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memcpy(t->response_buffer, data,
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t->response_size);
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}
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wake_up(&t->wait);
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}
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}
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spin_unlock_irqrestore(&transactions_lock, flags);
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}
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static struct fw_address_handler response_register_handler = {
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.length = 0x200,
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.address_callback = fcp_response,
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};
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static int __init fcp_module_init(void)
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{
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static const struct fw_address_region response_register_region = {
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.start = CSR_REGISTER_BASE + CSR_FCP_RESPONSE,
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.end = CSR_REGISTER_BASE + CSR_FCP_END,
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};
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fw_core_add_address_handler(&response_register_handler,
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&response_register_region);
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return 0;
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}
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static void __exit fcp_module_exit(void)
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{
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WARN_ON(!list_empty(&transactions));
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fw_core_remove_address_handler(&response_register_handler);
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}
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module_init(fcp_module_init);
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module_exit(fcp_module_exit);
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