1 /* 2 * motu-transaction.c - a part of driver for MOTU FireWire series 3 * 4 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp> 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 10 #include "motu.h" 11 12 #define SND_MOTU_ADDR_BASE 0xfffff0000000ULL 13 #define ASYNC_ADDR_HI 0x0b04 14 #define ASYNC_ADDR_LO 0x0b08 15 16 int snd_motu_transaction_read(struct snd_motu *motu, u32 offset, __be32 *reg, 17 size_t size) 18 { 19 int tcode; 20 21 if (size % sizeof(__be32) > 0 || size <= 0) 22 return -EINVAL; 23 if (size == sizeof(__be32)) 24 tcode = TCODE_READ_QUADLET_REQUEST; 25 else 26 tcode = TCODE_READ_BLOCK_REQUEST; 27 28 return snd_fw_transaction(motu->unit, tcode, 29 SND_MOTU_ADDR_BASE + offset, reg, size, 0); 30 } 31 32 int snd_motu_transaction_write(struct snd_motu *motu, u32 offset, __be32 *reg, 33 size_t size) 34 { 35 int tcode; 36 37 if (size % sizeof(__be32) > 0 || size <= 0) 38 return -EINVAL; 39 if (size == sizeof(__be32)) 40 tcode = TCODE_WRITE_QUADLET_REQUEST; 41 else 42 tcode = TCODE_WRITE_BLOCK_REQUEST; 43 44 return snd_fw_transaction(motu->unit, tcode, 45 SND_MOTU_ADDR_BASE + offset, reg, size, 0); 46 } 47 48 static void handle_message(struct fw_card *card, struct fw_request *request, 49 int tcode, int destination, int source, 50 int generation, unsigned long long offset, 51 void *data, size_t length, void *callback_data) 52 { 53 struct snd_motu *motu = callback_data; 54 __be32 *buf = (__be32 *)data; 55 unsigned long flags; 56 57 if (tcode != TCODE_WRITE_QUADLET_REQUEST) { 58 fw_send_response(card, request, RCODE_COMPLETE); 59 return; 60 } 61 62 if (offset != motu->async_handler.offset || length != 4) { 63 fw_send_response(card, request, RCODE_ADDRESS_ERROR); 64 return; 65 } 66 67 spin_lock_irqsave(&motu->lock, flags); 68 motu->msg = be32_to_cpu(*buf); 69 spin_unlock_irqrestore(&motu->lock, flags); 70 71 fw_send_response(card, request, RCODE_COMPLETE); 72 73 wake_up(&motu->hwdep_wait); 74 } 75 76 int snd_motu_transaction_reregister(struct snd_motu *motu) 77 { 78 struct fw_device *device = fw_parent_device(motu->unit); 79 __be32 data; 80 int err; 81 82 if (motu->async_handler.callback_data == NULL) 83 return -EINVAL; 84 85 /* Register messaging address. Block transaction is not allowed. */ 86 data = cpu_to_be32((device->card->node_id << 16) | 87 (motu->async_handler.offset >> 32)); 88 err = snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, 89 sizeof(data)); 90 if (err < 0) 91 return err; 92 93 data = cpu_to_be32(motu->async_handler.offset); 94 return snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, 95 sizeof(data)); 96 } 97 98 int snd_motu_transaction_register(struct snd_motu *motu) 99 { 100 static const struct fw_address_region resp_register_region = { 101 .start = 0xffffe0000000ull, 102 .end = 0xffffe000ffffull, 103 }; 104 int err; 105 106 /* Perhaps, 4 byte messages are transferred. */ 107 motu->async_handler.length = 4; 108 motu->async_handler.address_callback = handle_message; 109 motu->async_handler.callback_data = motu; 110 111 err = fw_core_add_address_handler(&motu->async_handler, 112 &resp_register_region); 113 if (err < 0) 114 return err; 115 116 err = snd_motu_transaction_reregister(motu); 117 if (err < 0) { 118 fw_core_remove_address_handler(&motu->async_handler); 119 motu->async_handler.address_callback = NULL; 120 } 121 122 return err; 123 } 124 125 void snd_motu_transaction_unregister(struct snd_motu *motu) 126 { 127 __be32 data; 128 129 if (motu->async_handler.address_callback != NULL) 130 fw_core_remove_address_handler(&motu->async_handler); 131 motu->async_handler.address_callback = NULL; 132 133 /* Unregister the address. */ 134 data = cpu_to_be32(0x00000000); 135 snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, sizeof(data)); 136 snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, sizeof(data)); 137 } 138