drivers/soundwire/bus.h

   1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
   2 /* Copyright(c) 2015-17 Intel Corporation. */
   3
   4 #ifndef __SDW_BUS_H
   5 #define __SDW_BUS_H
   6
   7 #define DEFAULT_BANK_SWITCH_TIMEOUT 3000
   8 #define DEFAULT_PROBE_TIMEOUT       2000
   9
  10 #if IS_ENABLED(CONFIG_ACPI)
  11 int sdw_acpi_find_slaves(struct sdw_bus *bus);
  12 #else
  13 static inline int sdw_acpi_find_slaves(struct sdw_bus *bus)
  14 {
  15         return -ENOTSUPP;
  16 }
  17 #endif
  18
  19 int sdw_of_find_slaves(struct sdw_bus *bus);
  20 void sdw_extract_slave_id(struct sdw_bus *bus,
  21                           u64 addr, struct sdw_slave_id *id);
  22
  23 #ifdef CONFIG_DEBUG_FS
  24 void sdw_bus_debugfs_init(struct sdw_bus *bus);
  25 void sdw_bus_debugfs_exit(struct sdw_bus *bus);
  26 void sdw_slave_debugfs_init(struct sdw_slave *slave);
  27 void sdw_slave_debugfs_exit(struct sdw_slave *slave);
  28 void sdw_debugfs_init(void);
  29 void sdw_debugfs_exit(void);
  30 #else
  31 static inline void sdw_bus_debugfs_init(struct sdw_bus *bus) {}
  32 static inline void sdw_bus_debugfs_exit(struct sdw_bus *bus) {}
  33 static inline void sdw_slave_debugfs_init(struct sdw_slave *slave) {}
  34 static inline void sdw_slave_debugfs_exit(struct sdw_slave *slave) {}
  35 static inline void sdw_debugfs_init(void) {}
  36 static inline void sdw_debugfs_exit(void) {}
  37 #endif
  38
  39 enum {
  40         SDW_MSG_FLAG_READ = 0,
  41         SDW_MSG_FLAG_WRITE,
  42 };
  43
  44 /**
  45  * struct sdw_msg - Message structure
  46  * @addr: Register address accessed in the Slave
  47  * @len: number of messages
  48  * @dev_num: Slave device number
  49  * @addr_page1: SCP address page 1 Slave register
  50  * @addr_page2: SCP address page 2 Slave register
  51  * @flags: transfer flags, indicate if xfer is read or write
  52  * @buf: message data buffer
  53  * @ssp_sync: Send message at SSP (Stream Synchronization Point)
  54  * @page: address requires paging
  55  */
  56 struct sdw_msg {
  57         u16 addr;
  58         u16 len;
  59         u8 dev_num;
  60         u8 addr_page1;
  61         u8 addr_page2;
  62         u8 flags;
  63         u8 *buf;
  64         bool ssp_sync;
  65         bool page;
  66 };
  67
  68 #define SDW_DOUBLE_RATE_FACTOR          2
  69
  70 extern int sdw_rows[SDW_FRAME_ROWS];
  71 extern int sdw_cols[SDW_FRAME_COLS];
  72
  73 int sdw_find_row_index(int row);
  74 int sdw_find_col_index(int col);
  75
  76 /**
  77  * sdw_port_runtime: Runtime port parameters for Master or Slave
  78  *
  79  * @num: Port number. For audio streams, valid port number ranges from
  80  * [1,14]
  81  * @ch_mask: Channel mask
  82  * @transport_params: Transport parameters
  83  * @port_params: Port parameters
  84  * @port_node: List node for Master or Slave port_list
  85  *
  86  * SoundWire spec has no mention of ports for Master interface but the
  87  * concept is logically extended.
  88  */
  89 struct sdw_port_runtime {
  90         int num;
  91         int ch_mask;
  92         struct sdw_transport_params transport_params;
  93         struct sdw_port_params port_params;
  94         struct list_head port_node;
  95 };
  96
  97 /**
  98  * sdw_slave_runtime: Runtime Stream parameters for Slave
  99  *
 100  * @slave: Slave handle
 101  * @direction: Data direction for Slave
 102  * @ch_count: Number of channels handled by the Slave for
 103  * this stream
 104  * @m_rt_node: sdw_master_runtime list node
 105  * @port_list: List of Slave Ports configured for this stream
 106  */
 107 struct sdw_slave_runtime {
 108         struct sdw_slave *slave;
 109         enum sdw_data_direction direction;
 110         unsigned int ch_count;
 111         struct list_head m_rt_node;
 112         struct list_head port_list;
 113 };
 114
 115 /**
 116  * sdw_master_runtime: Runtime stream parameters for Master
 117  *
 118  * @bus: Bus handle
 119  * @stream: Stream runtime handle
 120  * @direction: Data direction for Master
 121  * @ch_count: Number of channels handled by the Master for
 122  * this stream, can be zero.
 123  * @slave_rt_list: Slave runtime list
 124  * @port_list: List of Master Ports configured for this stream, can be zero.
 125  * @stream_node: sdw_stream_runtime master_list node
 126  * @bus_node: sdw_bus m_rt_list node
 127  */
 128 struct sdw_master_runtime {
 129         struct sdw_bus *bus;
 130         struct sdw_stream_runtime *stream;
 131         enum sdw_data_direction direction;
 132         unsigned int ch_count;
 133         struct list_head slave_rt_list;
 134         struct list_head port_list;
 135         struct list_head stream_node;
 136         struct list_head bus_node;
 137 };
 138
 139 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
 140                                             enum sdw_data_direction direction,
 141                                             unsigned int port_num);
 142 int sdw_configure_dpn_intr(struct sdw_slave *slave, int port,
 143                            bool enable, int mask);
 144
 145 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
 146 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
 147                        struct sdw_defer *defer);
 148
 149 #define SDW_READ_INTR_CLEAR_RETRY       10
 150
 151 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
 152                  u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
 153
 154 /* Read-Modify-Write Slave register */
 155 static inline int
 156 sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
 157 {
 158         int tmp;
 159
 160         tmp = sdw_read(slave, addr);
 161         if (tmp < 0)
 162                 return tmp;
 163
 164         tmp = (tmp & ~mask) | val;
 165         return sdw_write(slave, addr, tmp);
 166 }
 167
 168 /*
 169  * At the moment we only track Master-initiated hw_reset.
 170  * Additional fields can be added as needed
 171  */
 172 #define SDW_UNATTACH_REQUEST_MASTER_RESET       BIT(0)
 173
 174 void sdw_clear_slave_status(struct sdw_bus *bus, u32 request);
 175
 176 #endif /* __SDW_BUS_H */