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413 lines
10 KiB
413 lines
10 KiB
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
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// Copyright(c) 2015-17 Intel Corporation. |
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/* |
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* SDW Intel Init Routines |
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* |
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* Initializes and creates SDW devices based on ACPI and Hardware values |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/export.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/auxiliary_bus.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/soundwire/sdw_intel.h> |
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#include "cadence_master.h" |
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#include "intel.h" |
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static void intel_link_dev_release(struct device *dev) |
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{ |
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struct auxiliary_device *auxdev = to_auxiliary_dev(dev); |
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struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); |
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kfree(ldev); |
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} |
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/* alloc, init and add link devices */ |
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static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res, |
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struct sdw_intel_ctx *ctx, |
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struct fwnode_handle *fwnode, |
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const char *name, |
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int link_id) |
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{ |
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struct sdw_intel_link_dev *ldev; |
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struct sdw_intel_link_res *link; |
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struct auxiliary_device *auxdev; |
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int ret; |
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ldev = kzalloc(sizeof(*ldev), GFP_KERNEL); |
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if (!ldev) |
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return ERR_PTR(-ENOMEM); |
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auxdev = &ldev->auxdev; |
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auxdev->name = name; |
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auxdev->dev.parent = res->parent; |
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auxdev->dev.fwnode = fwnode; |
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auxdev->dev.release = intel_link_dev_release; |
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/* we don't use an IDA since we already have a link ID */ |
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auxdev->id = link_id; |
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/* |
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* keep a handle on the allocated memory, to be used in all other functions. |
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* Since the same pattern is used to skip links that are not enabled, there is |
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* no need to check if ctx->ldev[i] is NULL later on. |
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*/ |
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ctx->ldev[link_id] = ldev; |
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/* Add link information used in the driver probe */ |
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link = &ldev->link_res; |
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link->mmio_base = res->mmio_base; |
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link->registers = res->mmio_base + SDW_LINK_BASE |
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+ (SDW_LINK_SIZE * link_id); |
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link->shim = res->mmio_base + res->shim_base; |
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link->alh = res->mmio_base + res->alh_base; |
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link->ops = res->ops; |
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link->dev = res->dev; |
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link->clock_stop_quirks = res->clock_stop_quirks; |
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link->shim_lock = &ctx->shim_lock; |
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link->shim_mask = &ctx->shim_mask; |
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link->link_mask = ctx->link_mask; |
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/* now follow the two-step init/add sequence */ |
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ret = auxiliary_device_init(auxdev); |
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if (ret < 0) { |
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dev_err(res->parent, "failed to initialize link dev %s link_id %d\n", |
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name, link_id); |
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kfree(ldev); |
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return ERR_PTR(ret); |
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} |
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ret = auxiliary_device_add(&ldev->auxdev); |
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if (ret < 0) { |
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dev_err(res->parent, "failed to add link dev %s link_id %d\n", |
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ldev->auxdev.name, link_id); |
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/* ldev will be freed with the put_device() and .release sequence */ |
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auxiliary_device_uninit(&ldev->auxdev); |
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return ERR_PTR(ret); |
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} |
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return ldev; |
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} |
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static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev) |
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{ |
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auxiliary_device_delete(&ldev->auxdev); |
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auxiliary_device_uninit(&ldev->auxdev); |
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} |
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static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx) |
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{ |
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struct sdw_intel_link_dev *ldev; |
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u32 link_mask; |
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int i; |
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link_mask = ctx->link_mask; |
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for (i = 0; i < ctx->count; i++) { |
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if (!(link_mask & BIT(i))) |
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continue; |
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ldev = ctx->ldev[i]; |
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pm_runtime_disable(&ldev->auxdev.dev); |
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if (!ldev->link_res.clock_stop_quirks) |
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pm_runtime_put_noidle(ldev->link_res.dev); |
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intel_link_dev_unregister(ldev); |
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} |
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return 0; |
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} |
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#define HDA_DSP_REG_ADSPIC2 (0x10) |
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#define HDA_DSP_REG_ADSPIS2 (0x14) |
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#define HDA_DSP_REG_ADSPIC2_SNDW BIT(5) |
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/** |
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* sdw_intel_enable_irq() - enable/disable Intel SoundWire IRQ |
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* @mmio_base: The mmio base of the control register |
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* @enable: true if enable |
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*/ |
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void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable) |
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{ |
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u32 val; |
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val = readl(mmio_base + HDA_DSP_REG_ADSPIC2); |
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if (enable) |
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val |= HDA_DSP_REG_ADSPIC2_SNDW; |
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else |
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val &= ~HDA_DSP_REG_ADSPIC2_SNDW; |
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writel(val, mmio_base + HDA_DSP_REG_ADSPIC2); |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_enable_irq, SOUNDWIRE_INTEL_INIT); |
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irqreturn_t sdw_intel_thread(int irq, void *dev_id) |
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{ |
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struct sdw_intel_ctx *ctx = dev_id; |
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struct sdw_intel_link_res *link; |
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list_for_each_entry(link, &ctx->link_list, list) |
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sdw_cdns_irq(irq, link->cdns); |
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sdw_intel_enable_irq(ctx->mmio_base, true); |
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return IRQ_HANDLED; |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT); |
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static struct sdw_intel_ctx |
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*sdw_intel_probe_controller(struct sdw_intel_res *res) |
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{ |
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struct sdw_intel_link_res *link; |
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struct sdw_intel_link_dev *ldev; |
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struct sdw_intel_ctx *ctx; |
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struct acpi_device *adev; |
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struct sdw_slave *slave; |
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struct list_head *node; |
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struct sdw_bus *bus; |
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u32 link_mask; |
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int num_slaves = 0; |
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int count; |
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int i; |
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if (!res) |
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return NULL; |
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if (acpi_bus_get_device(res->handle, &adev)) |
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return NULL; |
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if (!res->count) |
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return NULL; |
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count = res->count; |
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dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count); |
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/* |
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* we need to alloc/free memory manually and can't use devm: |
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* this routine may be called from a workqueue, and not from |
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* the parent .probe. |
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* If devm_ was used, the memory might never be freed on errors. |
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*/ |
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
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if (!ctx) |
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return NULL; |
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ctx->count = count; |
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/* |
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* allocate the array of pointers. The link-specific data is allocated |
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* as part of the first loop below and released with the auxiliary_device_uninit(). |
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* If some links are disabled, the link pointer will remain NULL. Given that the |
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* number of links is small, this is simpler than using a list to keep track of links. |
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*/ |
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ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL); |
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if (!ctx->ldev) { |
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kfree(ctx); |
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return NULL; |
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} |
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ctx->mmio_base = res->mmio_base; |
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ctx->shim_base = res->shim_base; |
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ctx->alh_base = res->alh_base; |
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ctx->link_mask = res->link_mask; |
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ctx->handle = res->handle; |
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mutex_init(&ctx->shim_lock); |
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link_mask = ctx->link_mask; |
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INIT_LIST_HEAD(&ctx->link_list); |
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for (i = 0; i < count; i++) { |
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if (!(link_mask & BIT(i))) |
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continue; |
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/* |
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* init and add a device for each link |
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* |
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* The name of the device will be soundwire_intel.link.[i], |
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* with the "soundwire_intel" module prefix automatically added |
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* by the auxiliary bus core. |
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*/ |
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ldev = intel_link_dev_register(res, |
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ctx, |
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acpi_fwnode_handle(adev), |
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"link", |
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i); |
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if (IS_ERR(ldev)) |
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goto err; |
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link = &ldev->link_res; |
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link->cdns = dev_get_drvdata(&ldev->auxdev.dev); |
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if (!link->cdns) { |
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dev_err(&adev->dev, "failed to get link->cdns\n"); |
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/* |
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* 1 will be subtracted from i in the err label, but we need to call |
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* intel_link_dev_unregister for this ldev, so plus 1 now |
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*/ |
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i++; |
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goto err; |
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} |
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list_add_tail(&link->list, &ctx->link_list); |
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bus = &link->cdns->bus; |
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/* Calculate number of slaves */ |
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list_for_each(node, &bus->slaves) |
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num_slaves++; |
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} |
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ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL); |
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if (!ctx->ids) |
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goto err; |
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ctx->num_slaves = num_slaves; |
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i = 0; |
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list_for_each_entry(link, &ctx->link_list, list) { |
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bus = &link->cdns->bus; |
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list_for_each_entry(slave, &bus->slaves, node) { |
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ctx->ids[i].id = slave->id; |
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ctx->ids[i].link_id = bus->link_id; |
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i++; |
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} |
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} |
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return ctx; |
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err: |
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while (i--) { |
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if (!(link_mask & BIT(i))) |
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continue; |
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ldev = ctx->ldev[i]; |
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intel_link_dev_unregister(ldev); |
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} |
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kfree(ctx->ldev); |
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kfree(ctx); |
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return NULL; |
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} |
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static int |
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sdw_intel_startup_controller(struct sdw_intel_ctx *ctx) |
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{ |
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struct acpi_device *adev; |
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struct sdw_intel_link_dev *ldev; |
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u32 caps; |
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u32 link_mask; |
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int i; |
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if (acpi_bus_get_device(ctx->handle, &adev)) |
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return -EINVAL; |
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/* Check SNDWLCAP.LCOUNT */ |
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caps = ioread32(ctx->mmio_base + ctx->shim_base + SDW_SHIM_LCAP); |
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caps &= GENMASK(2, 0); |
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/* Check HW supported vs property value */ |
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if (caps < ctx->count) { |
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dev_err(&adev->dev, |
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"BIOS master count is larger than hardware capabilities\n"); |
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return -EINVAL; |
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} |
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if (!ctx->ldev) |
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return -EINVAL; |
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link_mask = ctx->link_mask; |
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/* Startup SDW Master devices */ |
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for (i = 0; i < ctx->count; i++) { |
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if (!(link_mask & BIT(i))) |
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continue; |
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ldev = ctx->ldev[i]; |
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intel_link_startup(&ldev->auxdev); |
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if (!ldev->link_res.clock_stop_quirks) { |
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/* |
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* we need to prevent the parent PCI device |
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* from entering pm_runtime suspend, so that |
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* power rails to the SoundWire IP are not |
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* turned off. |
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*/ |
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pm_runtime_get_noresume(ldev->link_res.dev); |
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} |
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} |
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return 0; |
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} |
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/** |
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* sdw_intel_probe() - SoundWire Intel probe routine |
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* @res: resource data |
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* |
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* This registers an auxiliary device for each Master handled by the controller, |
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* and SoundWire Master and Slave devices will be created by the auxiliary |
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* device probe. All the information necessary is stored in the context, and |
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* the res argument pointer can be freed after this step. |
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* This function will be called after sdw_intel_acpi_scan() by SOF probe. |
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*/ |
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struct sdw_intel_ctx |
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*sdw_intel_probe(struct sdw_intel_res *res) |
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{ |
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return sdw_intel_probe_controller(res); |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT); |
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/** |
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* sdw_intel_startup() - SoundWire Intel startup |
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* @ctx: SoundWire context allocated in the probe |
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* |
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* Startup Intel SoundWire controller. This function will be called after |
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* Intel Audio DSP is powered up. |
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*/ |
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int sdw_intel_startup(struct sdw_intel_ctx *ctx) |
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{ |
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return sdw_intel_startup_controller(ctx); |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT); |
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/** |
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* sdw_intel_exit() - SoundWire Intel exit |
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* @ctx: SoundWire context allocated in the probe |
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* |
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* Delete the controller instances created and cleanup |
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*/ |
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void sdw_intel_exit(struct sdw_intel_ctx *ctx) |
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{ |
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sdw_intel_cleanup(ctx); |
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kfree(ctx->ids); |
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kfree(ctx->ldev); |
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kfree(ctx); |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT); |
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void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx) |
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{ |
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struct sdw_intel_link_dev *ldev; |
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u32 link_mask; |
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int i; |
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if (!ctx->ldev) |
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return; |
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link_mask = ctx->link_mask; |
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/* Startup SDW Master devices */ |
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for (i = 0; i < ctx->count; i++) { |
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if (!(link_mask & BIT(i))) |
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continue; |
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ldev = ctx->ldev[i]; |
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intel_link_process_wakeen_event(&ldev->auxdev); |
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} |
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} |
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EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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MODULE_DESCRIPTION("Intel Soundwire Init Library");
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