1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 /* 5 * SDW Intel Init Routines 6 * 7 * Initializes and creates SDW devices based on ACPI and Hardware values 8 */ 9 10 #include <linux/acpi.h> 11 #include <linux/export.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/soundwire/sdw_intel.h> 18 #include "cadence_master.h" 19 #include "intel.h" 20 21 #define SDW_SHIM_LCAP 0x0 22 #define SDW_SHIM_BASE 0x2C000 23 #define SDW_ALH_BASE 0x2C800 24 #define SDW_LINK_BASE 0x30000 25 #define SDW_LINK_SIZE 0x10000 26 27 static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx) 28 { 29 struct sdw_intel_link_res *link = ctx->links; 30 u32 link_mask; 31 int i; 32 33 if (!link) 34 return 0; 35 36 link_mask = ctx->link_mask; 37 38 for (i = 0; i < ctx->count; i++, link++) { 39 if (!(link_mask & BIT(i))) 40 continue; 41 42 if (link->pdev) { 43 pm_runtime_disable(&link->pdev->dev); 44 platform_device_unregister(link->pdev); 45 } 46 47 if (!link->clock_stop_quirks) 48 pm_runtime_put_noidle(link->dev); 49 } 50 51 return 0; 52 } 53 54 #define HDA_DSP_REG_ADSPIC2 (0x10) 55 #define HDA_DSP_REG_ADSPIS2 (0x14) 56 #define HDA_DSP_REG_ADSPIC2_SNDW BIT(5) 57 58 /** 59 * sdw_intel_enable_irq() - enable/disable Intel SoundWire IRQ 60 * @mmio_base: The mmio base of the control register 61 * @enable: true if enable 62 */ 63 void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable) 64 { 65 u32 val; 66 67 val = readl(mmio_base + HDA_DSP_REG_ADSPIC2); 68 69 if (enable) 70 val |= HDA_DSP_REG_ADSPIC2_SNDW; 71 else 72 val &= ~HDA_DSP_REG_ADSPIC2_SNDW; 73 74 writel(val, mmio_base + HDA_DSP_REG_ADSPIC2); 75 } 76 EXPORT_SYMBOL_NS(sdw_intel_enable_irq, SOUNDWIRE_INTEL_INIT); 77 78 irqreturn_t sdw_intel_thread(int irq, void *dev_id) 79 { 80 struct sdw_intel_ctx *ctx = dev_id; 81 struct sdw_intel_link_res *link; 82 83 list_for_each_entry(link, &ctx->link_list, list) 84 sdw_cdns_irq(irq, link->cdns); 85 86 sdw_intel_enable_irq(ctx->mmio_base, true); 87 return IRQ_HANDLED; 88 } 89 EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT); 90 91 static struct sdw_intel_ctx 92 *sdw_intel_probe_controller(struct sdw_intel_res *res) 93 { 94 struct platform_device_info pdevinfo; 95 struct platform_device *pdev; 96 struct sdw_intel_link_res *link; 97 struct sdw_intel_ctx *ctx; 98 struct acpi_device *adev; 99 struct sdw_slave *slave; 100 struct list_head *node; 101 struct sdw_bus *bus; 102 u32 link_mask; 103 int num_slaves = 0; 104 int count; 105 int i; 106 107 if (!res) 108 return NULL; 109 110 if (acpi_bus_get_device(res->handle, &adev)) 111 return NULL; 112 113 if (!res->count) 114 return NULL; 115 116 count = res->count; 117 dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count); 118 119 ctx = devm_kzalloc(&adev->dev, sizeof(*ctx), GFP_KERNEL); 120 if (!ctx) 121 return NULL; 122 123 ctx->count = count; 124 ctx->links = devm_kcalloc(&adev->dev, ctx->count, 125 sizeof(*ctx->links), GFP_KERNEL); 126 if (!ctx->links) 127 return NULL; 128 129 ctx->count = count; 130 ctx->mmio_base = res->mmio_base; 131 ctx->link_mask = res->link_mask; 132 ctx->handle = res->handle; 133 mutex_init(&ctx->shim_lock); 134 135 link = ctx->links; 136 link_mask = ctx->link_mask; 137 138 INIT_LIST_HEAD(&ctx->link_list); 139 140 /* Create SDW Master devices */ 141 for (i = 0; i < count; i++, link++) { 142 if (!(link_mask & BIT(i))) { 143 dev_dbg(&adev->dev, 144 "Link %d masked, will not be enabled\n", i); 145 continue; 146 } 147 148 link->mmio_base = res->mmio_base; 149 link->registers = res->mmio_base + SDW_LINK_BASE 150 + (SDW_LINK_SIZE * i); 151 link->shim = res->mmio_base + SDW_SHIM_BASE; 152 link->alh = res->mmio_base + SDW_ALH_BASE; 153 154 link->ops = res->ops; 155 link->dev = res->dev; 156 157 link->clock_stop_quirks = res->clock_stop_quirks; 158 link->shim_lock = &ctx->shim_lock; 159 link->shim_mask = &ctx->shim_mask; 160 link->link_mask = link_mask; 161 162 memset(&pdevinfo, 0, sizeof(pdevinfo)); 163 164 pdevinfo.parent = res->parent; 165 pdevinfo.name = "intel-sdw"; 166 pdevinfo.id = i; 167 pdevinfo.fwnode = acpi_fwnode_handle(adev); 168 pdevinfo.data = link; 169 pdevinfo.size_data = sizeof(*link); 170 171 pdev = platform_device_register_full(&pdevinfo); 172 if (IS_ERR(pdev)) { 173 dev_err(&adev->dev, 174 "platform device creation failed: %ld\n", 175 PTR_ERR(pdev)); 176 goto err; 177 } 178 link->pdev = pdev; 179 link->cdns = platform_get_drvdata(pdev); 180 181 list_add_tail(&link->list, &ctx->link_list); 182 bus = &link->cdns->bus; 183 /* Calculate number of slaves */ 184 list_for_each(node, &bus->slaves) 185 num_slaves++; 186 } 187 188 ctx->ids = devm_kcalloc(&adev->dev, num_slaves, 189 sizeof(*ctx->ids), GFP_KERNEL); 190 if (!ctx->ids) 191 goto err; 192 193 ctx->num_slaves = num_slaves; 194 i = 0; 195 list_for_each_entry(link, &ctx->link_list, list) { 196 bus = &link->cdns->bus; 197 list_for_each_entry(slave, &bus->slaves, node) { 198 ctx->ids[i].id = slave->id; 199 ctx->ids[i].link_id = bus->link_id; 200 i++; 201 } 202 } 203 204 return ctx; 205 206 err: 207 ctx->count = i; 208 sdw_intel_cleanup(ctx); 209 return NULL; 210 } 211 212 static int 213 sdw_intel_startup_controller(struct sdw_intel_ctx *ctx) 214 { 215 struct acpi_device *adev; 216 struct sdw_intel_link_res *link; 217 u32 caps; 218 u32 link_mask; 219 int i; 220 221 if (acpi_bus_get_device(ctx->handle, &adev)) 222 return -EINVAL; 223 224 /* Check SNDWLCAP.LCOUNT */ 225 caps = ioread32(ctx->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP); 226 caps &= GENMASK(2, 0); 227 228 /* Check HW supported vs property value */ 229 if (caps < ctx->count) { 230 dev_err(&adev->dev, 231 "BIOS master count is larger than hardware capabilities\n"); 232 return -EINVAL; 233 } 234 235 if (!ctx->links) 236 return -EINVAL; 237 238 link = ctx->links; 239 link_mask = ctx->link_mask; 240 241 /* Startup SDW Master devices */ 242 for (i = 0; i < ctx->count; i++, link++) { 243 if (!(link_mask & BIT(i))) 244 continue; 245 246 intel_master_startup(link->pdev); 247 248 if (!link->clock_stop_quirks) { 249 /* 250 * we need to prevent the parent PCI device 251 * from entering pm_runtime suspend, so that 252 * power rails to the SoundWire IP are not 253 * turned off. 254 */ 255 pm_runtime_get_noresume(link->dev); 256 } 257 } 258 259 return 0; 260 } 261 262 /** 263 * sdw_intel_probe() - SoundWire Intel probe routine 264 * @res: resource data 265 * 266 * This registers a platform device for each Master handled by the controller, 267 * and SoundWire Master and Slave devices will be created by the platform 268 * device probe. All the information necessary is stored in the context, and 269 * the res argument pointer can be freed after this step. 270 * This function will be called after sdw_intel_acpi_scan() by SOF probe. 271 */ 272 struct sdw_intel_ctx 273 *sdw_intel_probe(struct sdw_intel_res *res) 274 { 275 return sdw_intel_probe_controller(res); 276 } 277 EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT); 278 279 /** 280 * sdw_intel_startup() - SoundWire Intel startup 281 * @ctx: SoundWire context allocated in the probe 282 * 283 * Startup Intel SoundWire controller. This function will be called after 284 * Intel Audio DSP is powered up. 285 */ 286 int sdw_intel_startup(struct sdw_intel_ctx *ctx) 287 { 288 return sdw_intel_startup_controller(ctx); 289 } 290 EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT); 291 /** 292 * sdw_intel_exit() - SoundWire Intel exit 293 * @ctx: SoundWire context allocated in the probe 294 * 295 * Delete the controller instances created and cleanup 296 */ 297 void sdw_intel_exit(struct sdw_intel_ctx *ctx) 298 { 299 sdw_intel_cleanup(ctx); 300 } 301 EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT); 302 303 void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx) 304 { 305 struct sdw_intel_link_res *link; 306 u32 link_mask; 307 int i; 308 309 if (!ctx->links) 310 return; 311 312 link = ctx->links; 313 link_mask = ctx->link_mask; 314 315 /* Startup SDW Master devices */ 316 for (i = 0; i < ctx->count; i++, link++) { 317 if (!(link_mask & BIT(i))) 318 continue; 319 320 intel_master_process_wakeen_event(link->pdev); 321 } 322 } 323 EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT); 324 325 MODULE_LICENSE("Dual BSD/GPL"); 326 MODULE_DESCRIPTION("Intel Soundwire Init Library"); 327