364 lines
8.5 KiB
C
364 lines
8.5 KiB
C
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/*
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* dice_transaction.c - a part of driver for Dice based devices
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*
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* Copyright (c) Clemens Ladisch
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* Copyright (c) 2014 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include "dice.h"
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static u64 get_subaddr(struct snd_dice *dice, enum snd_dice_addr_type type,
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u64 offset)
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{
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switch (type) {
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case SND_DICE_ADDR_TYPE_TX:
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offset += dice->tx_offset;
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break;
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case SND_DICE_ADDR_TYPE_RX:
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offset += dice->rx_offset;
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break;
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case SND_DICE_ADDR_TYPE_SYNC:
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offset += dice->sync_offset;
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break;
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case SND_DICE_ADDR_TYPE_RSRV:
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offset += dice->rsrv_offset;
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break;
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case SND_DICE_ADDR_TYPE_GLOBAL:
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default:
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offset += dice->global_offset;
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break;
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}
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offset += DICE_PRIVATE_SPACE;
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return offset;
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}
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int snd_dice_transaction_write(struct snd_dice *dice,
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enum snd_dice_addr_type type,
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unsigned int offset, void *buf, unsigned int len)
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{
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return snd_fw_transaction(dice->unit,
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(len == 4) ? TCODE_WRITE_QUADLET_REQUEST :
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TCODE_WRITE_BLOCK_REQUEST,
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get_subaddr(dice, type, offset), buf, len, 0);
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}
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int snd_dice_transaction_read(struct snd_dice *dice,
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enum snd_dice_addr_type type, unsigned int offset,
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void *buf, unsigned int len)
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{
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return snd_fw_transaction(dice->unit,
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(len == 4) ? TCODE_READ_QUADLET_REQUEST :
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TCODE_READ_BLOCK_REQUEST,
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get_subaddr(dice, type, offset), buf, len, 0);
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}
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static unsigned int get_clock_info(struct snd_dice *dice, __be32 *info)
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{
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return snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_SELECT,
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info, 4);
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}
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int snd_dice_transaction_get_clock_source(struct snd_dice *dice,
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unsigned int *source)
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{
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__be32 info;
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int err;
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err = get_clock_info(dice, &info);
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if (err >= 0)
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*source = be32_to_cpu(info) & CLOCK_SOURCE_MASK;
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return err;
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}
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int snd_dice_transaction_get_rate(struct snd_dice *dice, unsigned int *rate)
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{
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__be32 info;
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unsigned int index;
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int err;
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err = get_clock_info(dice, &info);
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if (err < 0)
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goto end;
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index = (be32_to_cpu(info) & CLOCK_RATE_MASK) >> CLOCK_RATE_SHIFT;
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if (index >= SND_DICE_RATES_COUNT) {
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err = -ENOSYS;
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goto end;
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}
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*rate = snd_dice_rates[index];
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end:
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return err;
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}
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int snd_dice_transaction_set_enable(struct snd_dice *dice)
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{
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__be32 value;
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int err = 0;
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if (dice->global_enabled)
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goto end;
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value = cpu_to_be32(1);
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err = snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
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get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
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GLOBAL_ENABLE),
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&value, 4,
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FW_FIXED_GENERATION | dice->owner_generation);
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if (err < 0)
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goto end;
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dice->global_enabled = true;
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end:
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return err;
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}
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void snd_dice_transaction_clear_enable(struct snd_dice *dice)
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{
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__be32 value;
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value = 0;
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snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
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get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
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GLOBAL_ENABLE),
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&value, 4, FW_QUIET |
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FW_FIXED_GENERATION | dice->owner_generation);
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dice->global_enabled = false;
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}
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static void dice_notification(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 snd_dice *dice = callback_data;
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u32 bits;
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unsigned long flags;
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if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
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fw_send_response(card, request, RCODE_TYPE_ERROR);
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return;
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}
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if ((offset & 3) != 0) {
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fw_send_response(card, request, RCODE_ADDRESS_ERROR);
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return;
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}
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bits = be32_to_cpup(data);
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spin_lock_irqsave(&dice->lock, flags);
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dice->notification_bits |= bits;
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spin_unlock_irqrestore(&dice->lock, flags);
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fw_send_response(card, request, RCODE_COMPLETE);
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if (bits & NOTIFY_LOCK_CHG)
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complete(&dice->clock_accepted);
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wake_up(&dice->hwdep_wait);
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}
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static int register_notification_address(struct snd_dice *dice, bool retry)
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{
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struct fw_device *device = fw_parent_device(dice->unit);
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__be64 *buffer;
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unsigned int retries;
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int err;
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retries = (retry) ? 3 : 0;
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buffer = kmalloc(2 * 8, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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for (;;) {
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buffer[0] = cpu_to_be64(OWNER_NO_OWNER);
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buffer[1] = cpu_to_be64(
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((u64)device->card->node_id << OWNER_NODE_SHIFT) |
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dice->notification_handler.offset);
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dice->owner_generation = device->generation;
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smp_rmb(); /* node_id vs. generation */
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err = snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
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get_subaddr(dice,
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SND_DICE_ADDR_TYPE_GLOBAL,
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GLOBAL_OWNER),
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buffer, 2 * 8,
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FW_FIXED_GENERATION |
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dice->owner_generation);
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if (err == 0) {
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/* success */
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if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER))
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break;
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/* The address seems to be already registered. */
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if (buffer[0] == buffer[1])
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break;
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dev_err(&dice->unit->device,
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"device is already in use\n");
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err = -EBUSY;
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}
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if (err != -EAGAIN || retries-- > 0)
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break;
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msleep(20);
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}
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kfree(buffer);
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if (err < 0)
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dice->owner_generation = -1;
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return err;
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}
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static void unregister_notification_address(struct snd_dice *dice)
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{
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struct fw_device *device = fw_parent_device(dice->unit);
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__be64 *buffer;
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buffer = kmalloc(2 * 8, GFP_KERNEL);
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if (buffer == NULL)
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return;
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buffer[0] = cpu_to_be64(
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((u64)device->card->node_id << OWNER_NODE_SHIFT) |
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dice->notification_handler.offset);
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buffer[1] = cpu_to_be64(OWNER_NO_OWNER);
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snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
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get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
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GLOBAL_OWNER),
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buffer, 2 * 8, FW_QUIET |
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FW_FIXED_GENERATION | dice->owner_generation);
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kfree(buffer);
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dice->owner_generation = -1;
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}
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void snd_dice_transaction_destroy(struct snd_dice *dice)
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{
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struct fw_address_handler *handler = &dice->notification_handler;
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if (handler->callback_data == NULL)
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return;
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unregister_notification_address(dice);
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fw_core_remove_address_handler(handler);
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handler->callback_data = NULL;
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}
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int snd_dice_transaction_reinit(struct snd_dice *dice)
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{
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struct fw_address_handler *handler = &dice->notification_handler;
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if (handler->callback_data == NULL)
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return -EINVAL;
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return register_notification_address(dice, false);
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}
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static int get_subaddrs(struct snd_dice *dice)
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{
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static const int min_values[10] = {
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10, 0x64 / 4,
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10, 0x18 / 4,
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10, 0x18 / 4,
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0, 0,
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0, 0,
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};
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__be32 *pointers;
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__be32 version;
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u32 data;
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unsigned int i;
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int err;
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pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
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GFP_KERNEL);
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if (pointers == NULL)
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return -ENOMEM;
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/*
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* Check that the sub address spaces exist and are located inside the
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* private address space. The minimum values are chosen so that all
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* minimally required registers are included.
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*/
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err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
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DICE_PRIVATE_SPACE, pointers,
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sizeof(__be32) * ARRAY_SIZE(min_values), 0);
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if (err < 0)
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goto end;
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for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
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data = be32_to_cpu(pointers[i]);
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if (data < min_values[i] || data >= 0x40000) {
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err = -ENODEV;
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goto end;
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}
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}
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/*
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* Check that the implemented DICE driver specification major version
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* number matches.
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*/
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err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
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DICE_PRIVATE_SPACE +
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be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
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&version, sizeof(version), 0);
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if (err < 0)
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goto end;
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if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
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dev_err(&dice->unit->device,
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"unknown DICE version: 0x%08x\n", be32_to_cpu(version));
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err = -ENODEV;
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goto end;
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}
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dice->global_offset = be32_to_cpu(pointers[0]) * 4;
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dice->tx_offset = be32_to_cpu(pointers[2]) * 4;
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dice->rx_offset = be32_to_cpu(pointers[4]) * 4;
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dice->sync_offset = be32_to_cpu(pointers[6]) * 4;
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dice->rsrv_offset = be32_to_cpu(pointers[8]) * 4;
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/* Set up later. */
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if (be32_to_cpu(pointers[1]) * 4 >= GLOBAL_CLOCK_CAPABILITIES + 4)
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dice->clock_caps = 1;
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end:
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kfree(pointers);
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return err;
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}
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int snd_dice_transaction_init(struct snd_dice *dice)
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{
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struct fw_address_handler *handler = &dice->notification_handler;
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int err;
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err = get_subaddrs(dice);
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if (err < 0)
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return err;
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/* Allocation callback in address space over host controller */
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handler->length = 4;
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handler->address_callback = dice_notification;
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handler->callback_data = dice;
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err = fw_core_add_address_handler(handler, &fw_high_memory_region);
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if (err < 0) {
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handler->callback_data = NULL;
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return err;
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}
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/* Register the address space */
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err = register_notification_address(dice, true);
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if (err < 0) {
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fw_core_remove_address_handler(handler);
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handler->callback_data = NULL;
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}
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return err;
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}
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