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 55 if (tcode != TCODE_WRITE_QUADLET_REQUEST) { 56 fw_send_response(card, request, RCODE_COMPLETE); 57 return; 58 } 59 60 if (offset != motu->async_handler.offset || length != 4) { 61 fw_send_response(card, request, RCODE_ADDRESS_ERROR); 62 return; 63 } 64 65 scoped_guard(spinlock_irqsave, &motu->lock) { 66 motu->msg = be32_to_cpu(*buf); 67 } 68 69 fw_send_response(card, request, RCODE_COMPLETE); 70 71 wake_up(&motu->hwdep_wait); 72 } 73 74 int snd_motu_transaction_reregister(struct snd_motu *motu) 75 { 76 struct fw_device *device = fw_parent_device(motu->unit); 77 __be32 data; 78 int err; 79 80 if (motu->async_handler.callback_data == NULL) 81 return -EINVAL; 82 83 /* Register messaging address. Block transaction is not allowed. */ 84 data = cpu_to_be32((device->card->node_id << 16) | 85 (motu->async_handler.offset >> 32)); 86 err = snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, 87 sizeof(data)); 88 if (err < 0) 89 return err; 90 91 data = cpu_to_be32(motu->async_handler.offset); 92 return snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, 93 sizeof(data)); 94 } 95 96 int snd_motu_transaction_register(struct snd_motu *motu) 97 { 98 static const struct fw_address_region resp_register_region = { 99 .start = 0xffffe0000000ull, 100 .end = 0xffffe000ffffull, 101 }; 102 int err; 103 104 /* Perhaps, 4 byte messages are transferred. */ 105 motu->async_handler.length = 4; 106 motu->async_handler.address_callback = handle_message; 107 motu->async_handler.callback_data = motu; 108 109 err = fw_core_add_address_handler(&motu->async_handler, 110 &resp_register_region); 111 if (err < 0) 112 return err; 113 114 err = snd_motu_transaction_reregister(motu); 115 if (err < 0) { 116 fw_core_remove_address_handler(&motu->async_handler); 117 motu->async_handler.address_callback = NULL; 118 } 119 120 return err; 121 } 122 123 void snd_motu_transaction_unregister(struct snd_motu *motu) 124 { 125 __be32 data; 126 127 if (motu->async_handler.address_callback != NULL) 128 fw_core_remove_address_handler(&motu->async_handler); 129 motu->async_handler.address_callback = NULL; 130 131 /* Unregister the address. */ 132 data = cpu_to_be32(0x00000000); 133 snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, sizeof(data)); 134 snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, sizeof(data)); 135 } 136