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 int sdw_master_device_add(struct sdw_bus *bus, struct device *parent,
  23                           struct fwnode_handle *fwnode);
  24 int sdw_master_device_del(struct sdw_bus *bus);
  25
  26 #ifdef CONFIG_DEBUG_FS
  27 void sdw_bus_debugfs_init(struct sdw_bus *bus);
  28 void sdw_bus_debugfs_exit(struct sdw_bus *bus);
  29 void sdw_slave_debugfs_init(struct sdw_slave *slave);
  30 void sdw_slave_debugfs_exit(struct sdw_slave *slave);
  31 void sdw_debugfs_init(void);
  32 void sdw_debugfs_exit(void);
  33 #else
  34 static inline void sdw_bus_debugfs_init(struct sdw_bus *bus) {}
  35 static inline void sdw_bus_debugfs_exit(struct sdw_bus *bus) {}
  36 static inline void sdw_slave_debugfs_init(struct sdw_slave *slave) {}
  37 static inline void sdw_slave_debugfs_exit(struct sdw_slave *slave) {}
  38 static inline void sdw_debugfs_init(void) {}
  39 static inline void sdw_debugfs_exit(void) {}
  40 #endif
  41
  42 enum {
  43         SDW_MSG_FLAG_READ = 0,
  44         SDW_MSG_FLAG_WRITE,
  45 };
  46
  47 /**
  48  * struct sdw_msg - Message structure
  49  * @addr: Register address accessed in the Slave
  50  * @len: number of messages
  51  * @dev_num: Slave device number
  52  * @addr_page1: SCP address page 1 Slave register
  53  * @addr_page2: SCP address page 2 Slave register
  54  * @flags: transfer flags, indicate if xfer is read or write
  55  * @buf: message data buffer
  56  * @ssp_sync: Send message at SSP (Stream Synchronization Point)
  57  * @page: address requires paging
  58  */
  59 struct sdw_msg {
  60         u16 addr;
  61         u16 len;
  62         u8 dev_num;
  63         u8 addr_page1;
  64         u8 addr_page2;
  65         u8 flags;
  66         u8 *buf;
  67         bool ssp_sync;
  68         bool page;
  69 };
  70
  71 #define SDW_DOUBLE_RATE_FACTOR          2
  72
  73 extern int sdw_rows[SDW_FRAME_ROWS];
  74 extern int sdw_cols[SDW_FRAME_COLS];
  75
  76 int sdw_find_row_index(int row);
  77 int sdw_find_col_index(int col);
  78
  79 /**
  80  * sdw_port_runtime: Runtime port parameters for Master or Slave
  81  *
  82  * @num: Port number. For audio streams, valid port number ranges from
  83  * [1,14]
  84  * @ch_mask: Channel mask
  85  * @transport_params: Transport parameters
  86  * @port_params: Port parameters
  87  * @port_node: List node for Master or Slave port_list
  88  *
  89  * SoundWire spec has no mention of ports for Master interface but the
  90  * concept is logically extended.
  91  */
  92 struct sdw_port_runtime {
  93         int num;
  94         int ch_mask;
  95         struct sdw_transport_params transport_params;
  96         struct sdw_port_params port_params;
  97         struct list_head port_node;
  98 };
  99
 100 /**
 101  * sdw_slave_runtime: Runtime Stream parameters for Slave
 102  *
 103  * @slave: Slave handle
 104  * @direction: Data direction for Slave
 105  * @ch_count: Number of channels handled by the Slave for
 106  * this stream
 107  * @m_rt_node: sdw_master_runtime list node
 108  * @port_list: List of Slave Ports configured for this stream
 109  */
 110 struct sdw_slave_runtime {
 111         struct sdw_slave *slave;
 112         enum sdw_data_direction direction;
 113         unsigned int ch_count;
 114         struct list_head m_rt_node;
 115         struct list_head port_list;
 116 };
 117
 118 /**
 119  * sdw_master_runtime: Runtime stream parameters for Master
 120  *
 121  * @bus: Bus handle
 122  * @stream: Stream runtime handle
 123  * @direction: Data direction for Master
 124  * @ch_count: Number of channels handled by the Master for
 125  * this stream, can be zero.
 126  * @slave_rt_list: Slave runtime list
 127  * @port_list: List of Master Ports configured for this stream, can be zero.
 128  * @stream_node: sdw_stream_runtime master_list node
 129  * @bus_node: sdw_bus m_rt_list node
 130  */
 131 struct sdw_master_runtime {
 132         struct sdw_bus *bus;
 133         struct sdw_stream_runtime *stream;
 134         enum sdw_data_direction direction;
 135         unsigned int ch_count;
 136         struct list_head slave_rt_list;
 137         struct list_head port_list;
 138         struct list_head stream_node;
 139         struct list_head bus_node;
 140 };
 141
 142 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
 143                                             enum sdw_data_direction direction,
 144                                             unsigned int port_num);
 145 int sdw_configure_dpn_intr(struct sdw_slave *slave, int port,
 146                            bool enable, int mask);
 147
 148 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
 149 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
 150                        struct sdw_defer *defer);
 151
 152 #define SDW_READ_INTR_CLEAR_RETRY       10
 153
 154 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
 155                  u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
 156
 157 /* Read-Modify-Write Slave register */
 158 static inline int
 159 sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
 160 {
 161         int tmp;
 162
 163         tmp = sdw_read(slave, addr);
 164         if (tmp < 0)
 165                 return tmp;
 166
 167         tmp = (tmp & ~mask) | val;
 168         return sdw_write(slave, addr, tmp);
 169 }
 170
 171 /*
 172  * At the moment we only track Master-initiated hw_reset.
 173  * Additional fields can be added as needed
 174  */
 175 #define SDW_UNATTACH_REQUEST_MASTER_RESET       BIT(0)
 176
 177 void sdw_clear_slave_status(struct sdw_bus *bus, u32 request);
 178 int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size);
 179
 180 #endif /* __SDW_BUS_H */