1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */ 2 /* Copyright(c) 2015-17 Intel Corporation. */ 3 4 #ifndef __SDW_INTEL_H 5 #define __SDW_INTEL_H 6 7 #include <linux/irqreturn.h> 8 #include <linux/soundwire/sdw.h> 9 10 /** 11 * struct sdw_intel_stream_params_data: configuration passed during 12 * the @params_stream callback, e.g. for interaction with DSP 13 * firmware. 14 */ 15 struct sdw_intel_stream_params_data { 16 struct snd_pcm_substream *substream; 17 struct snd_soc_dai *dai; 18 struct snd_pcm_hw_params *hw_params; 19 int link_id; 20 int alh_stream_id; 21 }; 22 23 /** 24 * struct sdw_intel_stream_free_data: configuration passed during 25 * the @free_stream callback, e.g. for interaction with DSP 26 * firmware. 27 */ 28 struct sdw_intel_stream_free_data { 29 struct snd_pcm_substream *substream; 30 struct snd_soc_dai *dai; 31 int link_id; 32 }; 33 34 /** 35 * struct sdw_intel_ops: Intel audio driver callback ops 36 * 37 */ 38 struct sdw_intel_ops { 39 int (*params_stream)(struct device *dev, 40 struct sdw_intel_stream_params_data *params_data); 41 int (*free_stream)(struct device *dev, 42 struct sdw_intel_stream_free_data *free_data); 43 }; 44 45 /** 46 * struct sdw_intel_acpi_info - Soundwire Intel information found in ACPI tables 47 * @handle: ACPI controller handle 48 * @count: link count found with "sdw-master-count" property 49 * @link_mask: bit-wise mask listing links enabled by BIOS menu 50 * 51 * this structure could be expanded to e.g. provide all the _ADR 52 * information in case the link_mask is not sufficient to identify 53 * platform capabilities. 54 */ 55 struct sdw_intel_acpi_info { 56 acpi_handle handle; 57 int count; 58 u32 link_mask; 59 }; 60 61 struct sdw_intel_link_res; 62 63 /* Intel clock-stop/pm_runtime quirk definitions */ 64 65 /* 66 * Force the clock to remain on during pm_runtime suspend. This might 67 * be needed if Slave devices do not have an alternate clock source or 68 * if the latency requirements are very strict. 69 */ 70 #define SDW_INTEL_CLK_STOP_NOT_ALLOWED BIT(0) 71 72 /* 73 * Stop the bus during pm_runtime suspend. If set, a complete bus 74 * reset and re-enumeration will be performed when the bus 75 * restarts. This mode shall not be used if Slave devices can generate 76 * in-band wakes. 77 */ 78 #define SDW_INTEL_CLK_STOP_TEARDOWN BIT(1) 79 80 /* 81 * Stop the bus during pm_suspend if Slaves are not wake capable 82 * (e.g. speaker amplifiers). The clock-stop mode is typically 83 * slightly higher power than when the IP is completely powered-off. 84 */ 85 #define SDW_INTEL_CLK_STOP_WAKE_CAPABLE_ONLY BIT(2) 86 87 /* 88 * Require a bus reset (and complete re-enumeration) when exiting 89 * clock stop modes. This may be needed if the controller power was 90 * turned off and all context lost. This quirk shall not be used if a 91 * Slave device needs to remain enumerated and keep its context, 92 * e.g. to provide the reasons for the wake, report acoustic events or 93 * pass a history buffer. 94 */ 95 #define SDW_INTEL_CLK_STOP_BUS_RESET BIT(3) 96 97 struct sdw_intel_slave_id { 98 int link_id; 99 struct sdw_slave_id id; 100 }; 101 102 /** 103 * struct sdw_intel_ctx - context allocated by the controller 104 * driver probe 105 * @count: link count 106 * @mmio_base: mmio base of SoundWire registers, only used to check 107 * hardware capabilities after all power dependencies are settled. 108 * @link_mask: bit-wise mask listing SoundWire links reported by the 109 * Controller 110 * @num_slaves: total number of devices exposed across all enabled links 111 * @handle: ACPI parent handle 112 * @links: information for each link (controller-specific and kept 113 * opaque here) 114 * @ids: array of slave_id, representing Slaves exposed across all enabled 115 * links 116 * @link_list: list to handle interrupts across all links 117 * @shim_lock: mutex to handle concurrent rmw access to shared SHIM registers. 118 * @shim_mask: flags to track initialization of SHIM shared registers 119 */ 120 struct sdw_intel_ctx { 121 int count; 122 void __iomem *mmio_base; 123 u32 link_mask; 124 int num_slaves; 125 acpi_handle handle; 126 struct sdw_intel_link_res *links; 127 struct sdw_intel_slave_id *ids; 128 struct list_head link_list; 129 struct mutex shim_lock; /* lock for access to shared SHIM registers */ 130 u32 shim_mask; 131 }; 132 133 /** 134 * struct sdw_intel_res - Soundwire Intel global resource structure, 135 * typically populated by the DSP driver 136 * 137 * @count: link count 138 * @mmio_base: mmio base of SoundWire registers 139 * @irq: interrupt number 140 * @handle: ACPI parent handle 141 * @parent: parent device 142 * @ops: callback ops 143 * @dev: device implementing hwparams and free callbacks 144 * @link_mask: bit-wise mask listing links selected by the DSP driver 145 * This mask may be a subset of the one reported by the controller since 146 * machine-specific quirks are handled in the DSP driver. 147 * @clock_stop_quirks: mask array of possible behaviors requested by the 148 * DSP driver. The quirks are common for all links for now. 149 */ 150 struct sdw_intel_res { 151 int count; 152 void __iomem *mmio_base; 153 int irq; 154 acpi_handle handle; 155 struct device *parent; 156 const struct sdw_intel_ops *ops; 157 struct device *dev; 158 u32 link_mask; 159 u32 clock_stop_quirks; 160 }; 161 162 /* 163 * On Intel platforms, the SoundWire IP has dependencies on power 164 * rails shared with the DSP, and the initialization steps are split 165 * in three. First an ACPI scan to check what the firmware describes 166 * in DSDT tables, then an allocation step (with no hardware 167 * configuration but with all the relevant devices created) and last 168 * the actual hardware configuration. The final stage is a global 169 * interrupt enable which is controlled by the DSP driver. Splitting 170 * these phases helps simplify the boot flow and make early decisions 171 * on e.g. which machine driver to select (I2S mode, HDaudio or 172 * SoundWire). 173 */ 174 int sdw_intel_acpi_scan(acpi_handle *parent_handle, 175 struct sdw_intel_acpi_info *info); 176 177 void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx); 178 179 struct sdw_intel_ctx * 180 sdw_intel_probe(struct sdw_intel_res *res); 181 182 int sdw_intel_startup(struct sdw_intel_ctx *ctx); 183 184 void sdw_intel_exit(struct sdw_intel_ctx *ctx); 185 186 void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable); 187 188 irqreturn_t sdw_intel_thread(int irq, void *dev_id); 189 190 #endif 191
