1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * motu-transaction.c - a part of driver for MOTU FireWire series 4 * 5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp> 6 */ 7 8 9 #include "motu.h" 10 11 #define SND_MOTU_ADDR_BASE 0xfffff0000000ULL 12 #define ASYNC_ADDR_HI 0x0b04 13 #define ASYNC_ADDR_LO 0x0b08 14 15 int snd_motu_transaction_read(struct snd_motu *motu, u32 offset, __be32 *reg, 16 size_t size) 17 { 18 int tcode; 19 20 if (size % sizeof(__be32) > 0 || size <= 0) 21 return -EINVAL; 22 if (size == sizeof(__be32)) 23 tcode = TCODE_READ_QUADLET_REQUEST; 24 else 25 tcode = TCODE_READ_BLOCK_REQUEST; 26 27 return snd_fw_transaction(motu->unit, tcode, 28 SND_MOTU_ADDR_BASE + offset, reg, size, 0); 29 } 30 31 int snd_motu_transaction_write(struct snd_motu *motu, u32 offset, __be32 *reg, 32 size_t size) 33 { 34 int tcode; 35 36 if (size % sizeof(__be32) > 0 || size <= 0) 37 return -EINVAL; 38 if (size == sizeof(__be32)) 39 tcode = TCODE_WRITE_QUADLET_REQUEST; 40 else 41 tcode = TCODE_WRITE_BLOCK_REQUEST; 42 43 return snd_fw_transaction(motu->unit, tcode, 44 SND_MOTU_ADDR_BASE + offset, reg, size, 0); 45 } 46 47 static void handle_message(struct fw_card *card, struct fw_request *request, 48 int tcode, int destination, int source, 49 int generation, unsigned long long offset, 50 void *data, size_t length, void *callback_data) 51 { 52 struct snd_motu *motu = callback_data; 53 __be32 *buf = (__be32 *)data; 54 unsigned long flags; 55 56 if (tcode != TCODE_WRITE_QUADLET_REQUEST) { 57 fw_send_response(card, request, RCODE_COMPLETE); 58 return; 59 } 60 61 if (offset != motu->async_handler.offset || length != 4) { 62 fw_send_response(card, request, RCODE_ADDRESS_ERROR); 63 return; 64 } 65 66 spin_lock_irqsave(&motu->lock, flags); 67 motu->msg = be32_to_cpu(*buf); 68 spin_unlock_irqrestore(&motu->lock, flags); 69 70 fw_send_response(card, request, RCODE_COMPLETE); 71 72 wake_up(&motu->hwdep_wait); 73 } 74 75 int snd_motu_transaction_reregister(struct snd_motu *motu) 76 { 77 struct fw_device *device = fw_parent_device(motu->unit); 78 __be32 data; 79 int err; 80 81 if (motu->async_handler.callback_data == NULL) 82 return -EINVAL; 83 84 /* Register messaging address. Block transaction is not allowed. */ 85 data = cpu_to_be32((device->card->node_id << 16) | 86 (motu->async_handler.offset >> 32)); 87 err = snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, 88 sizeof(data)); 89 if (err < 0) 90 return err; 91 92 data = cpu_to_be32(motu->async_handler.offset); 93 return snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, 94 sizeof(data)); 95 } 96 97 int snd_motu_transaction_register(struct snd_motu *motu) 98 { 99 static const struct fw_address_region resp_register_region = { 100 .start = 0xffffe0000000ull, 101 .end = 0xffffe000ffffull, 102 }; 103 int err; 104 105 /* Perhaps, 4 byte messages are transferred. */ 106 motu->async_handler.length = 4; 107 motu->async_handler.address_callback = handle_message; 108 motu->async_handler.callback_data = motu; 109 110 err = fw_core_add_address_handler(&motu->async_handler, 111 &resp_register_region); 112 if (err < 0) 113 return err; 114 115 err = snd_motu_transaction_reregister(motu); 116 if (err < 0) { 117 fw_core_remove_address_handler(&motu->async_handler); 118 motu->async_handler.address_callback = NULL; 119 } 120 121 return err; 122 } 123 124 void snd_motu_transaction_unregister(struct snd_motu *motu) 125 { 126 __be32 data; 127 128 if (motu->async_handler.address_callback != NULL) 129 fw_core_remove_address_handler(&motu->async_handler); 130 motu->async_handler.address_callback = NULL; 131 132 /* Unregister the address. */ 133 data = cpu_to_be32(0x00000000); 134 snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, sizeof(data)); 135 snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, sizeof(data)); 136 } 137