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 if (!link->cdns) { 182 dev_err(&adev->dev, "failed to get link->cdns\n"); 183 /* 184 * 1 will be subtracted from i in the err label, but we need to call 185 * intel_link_dev_unregister for this ldev, so plus 1 now 186 */ 187 i++; 188 goto err; 189 } 190 list_add_tail(&link->list, &ctx->link_list); 191 bus = &link->cdns->bus; 192 /* Calculate number of slaves */ 193 list_for_each(node, &bus->slaves) 194 num_slaves++; 195 } 196 197 ctx->ids = devm_kcalloc(&adev->dev, num_slaves, 198 sizeof(*ctx->ids), GFP_KERNEL); 199 if (!ctx->ids) 200 goto err; 201 202 ctx->num_slaves = num_slaves; 203 i = 0; 204 list_for_each_entry(link, &ctx->link_list, list) { 205 bus = &link->cdns->bus; 206 list_for_each_entry(slave, &bus->slaves, node) { 207 ctx->ids[i].id = slave->id; 208 ctx->ids[i].link_id = bus->link_id; 209 i++; 210 } 211 } 212 213 return ctx; 214 215 err: 216 ctx->count = i; 217 sdw_intel_cleanup(ctx); 218 return NULL; 219 } 220 221 static int 222 sdw_intel_startup_controller(struct sdw_intel_ctx *ctx) 223 { 224 struct acpi_device *adev; 225 struct sdw_intel_link_res *link; 226 u32 caps; 227 u32 link_mask; 228 int i; 229 230 if (acpi_bus_get_device(ctx->handle, &adev)) 231 return -EINVAL; 232 233 /* Check SNDWLCAP.LCOUNT */ 234 caps = ioread32(ctx->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP); 235 caps &= GENMASK(2, 0); 236 237 /* Check HW supported vs property value */ 238 if (caps < ctx->count) { 239 dev_err(&adev->dev, 240 "BIOS master count is larger than hardware capabilities\n"); 241 return -EINVAL; 242 } 243 244 if (!ctx->links) 245 return -EINVAL; 246 247 link = ctx->links; 248 link_mask = ctx->link_mask; 249 250 /* Startup SDW Master devices */ 251 for (i = 0; i < ctx->count; i++, link++) { 252 if (!(link_mask & BIT(i))) 253 continue; 254 255 intel_master_startup(link->pdev); 256 257 if (!link->clock_stop_quirks) { 258 /* 259 * we need to prevent the parent PCI device 260 * from entering pm_runtime suspend, so that 261 * power rails to the SoundWire IP are not 262 * turned off. 263 */ 264 pm_runtime_get_noresume(link->dev); 265 } 266 } 267 268 return 0; 269 } 270 271 /** 272 * sdw_intel_probe() - SoundWire Intel probe routine 273 * @res: resource data 274 * 275 * This registers a platform device for each Master handled by the controller, 276 * and SoundWire Master and Slave devices will be created by the platform 277 * device probe. All the information necessary is stored in the context, and 278 * the res argument pointer can be freed after this step. 279 * This function will be called after sdw_intel_acpi_scan() by SOF probe. 280 */ 281 struct sdw_intel_ctx 282 *sdw_intel_probe(struct sdw_intel_res *res) 283 { 284 return sdw_intel_probe_controller(res); 285 } 286 EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT); 287 288 /** 289 * sdw_intel_startup() - SoundWire Intel startup 290 * @ctx: SoundWire context allocated in the probe 291 * 292 * Startup Intel SoundWire controller. This function will be called after 293 * Intel Audio DSP is powered up. 294 */ 295 int sdw_intel_startup(struct sdw_intel_ctx *ctx) 296 { 297 return sdw_intel_startup_controller(ctx); 298 } 299 EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT); 300 /** 301 * sdw_intel_exit() - SoundWire Intel exit 302 * @ctx: SoundWire context allocated in the probe 303 * 304 * Delete the controller instances created and cleanup 305 */ 306 void sdw_intel_exit(struct sdw_intel_ctx *ctx) 307 { 308 sdw_intel_cleanup(ctx); 309 } 310 EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT); 311 312 void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx) 313 { 314 struct sdw_intel_link_res *link; 315 u32 link_mask; 316 int i; 317 318 if (!ctx->links) 319 return; 320 321 link = ctx->links; 322 link_mask = ctx->link_mask; 323 324 /* Startup SDW Master devices */ 325 for (i = 0; i < ctx->count; i++, link++) { 326 if (!(link_mask & BIT(i))) 327 continue; 328 329 intel_master_process_wakeen_event(link->pdev); 330 } 331 } 332 EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT); 333 334 MODULE_LICENSE("Dual BSD/GPL"); 335 MODULE_DESCRIPTION("Intel Soundwire Init Library"); 336