--- /dev/null
+/*
+ * skl.c - Implementation of ASoC Intel SKL HD Audio driver
+ *
+ * Copyright (C) 2014-2015 Intel Corp
+ * Author: Jeeja KP <jeeja.kp@intel.com>
+ *
+ * Derived mostly from Intel HDA driver with following copyrights:
+ * Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
+ * PeiSen Hou <pshou@realtek.com.tw>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include "skl.h"
+
+/*
+ * initialize the PCI registers
+ */
+static void skl_update_pci_byte(struct pci_dev *pci, unsigned int reg,
+ unsigned char mask, unsigned char val)
+{
+ unsigned char data;
+
+ pci_read_config_byte(pci, reg, &data);
+ data &= ~mask;
+ data |= (val & mask);
+ pci_write_config_byte(pci, reg, data);
+}
+
+static void skl_init_pci(struct skl *skl)
+{
+ struct hdac_ext_bus *ebus = &skl->ebus;
+
+ /*
+ * Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
+ * TCSEL == Traffic Class Select Register, which sets PCI express QOS
+ * Ensuring these bits are 0 clears playback static on some HD Audio
+ * codecs.
+ * The PCI register TCSEL is defined in the Intel manuals.
+ */
+ dev_dbg(ebus_to_hbus(ebus)->dev, "Clearing TCSEL\n");
+ skl_update_pci_byte(skl->pci, AZX_PCIREG_TCSEL, 0x07, 0);
+}
+
+/* called from IRQ */
+static void skl_stream_update(struct hdac_bus *bus, struct hdac_stream *hstr)
+{
+ snd_pcm_period_elapsed(hstr->substream);
+}
+
+static irqreturn_t skl_interrupt(int irq, void *dev_id)
+{
+ struct hdac_ext_bus *ebus = dev_id;
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ u32 status;
+
+ if (!pm_runtime_active(bus->dev))
+ return IRQ_NONE;
+
+ spin_lock(&bus->reg_lock);
+
+ status = snd_hdac_chip_readl(bus, INTSTS);
+ if (status == 0 || status == 0xffffffff) {
+ spin_unlock(&bus->reg_lock);
+ return IRQ_NONE;
+ }
+
+ /* clear rirb int */
+ status = snd_hdac_chip_readb(bus, RIRBSTS);
+ if (status & RIRB_INT_MASK) {
+ if (status & RIRB_INT_RESPONSE)
+ snd_hdac_bus_update_rirb(bus);
+ snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
+ }
+
+ spin_unlock(&bus->reg_lock);
+
+ return snd_hdac_chip_readl(bus, INTSTS) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
+}
+
+static irqreturn_t skl_threaded_handler(int irq, void *dev_id)
+{
+ struct hdac_ext_bus *ebus = dev_id;
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ u32 status;
+
+ status = snd_hdac_chip_readl(bus, INTSTS);
+
+ snd_hdac_bus_handle_stream_irq(bus, status, skl_stream_update);
+
+ return IRQ_HANDLED;
+}
+
+static int skl_acquire_irq(struct hdac_ext_bus *ebus, int do_disconnect)
+{
+ struct skl *skl = ebus_to_skl(ebus);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ int ret;
+
+ ret = request_threaded_irq(skl->pci->irq, skl_interrupt,
+ skl_threaded_handler,
+ IRQF_SHARED,
+ KBUILD_MODNAME, ebus);
+ if (ret) {
+ dev_err(bus->dev,
+ "unable to grab IRQ %d, disabling device\n",
+ skl->pci->irq);
+ return ret;
+ }
+
+ bus->irq = skl->pci->irq;
+ pci_intx(skl->pci, 1);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * power management
+ */
+static int skl_suspend(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+
+ snd_hdac_bus_stop_chip(bus);
+ snd_hdac_bus_enter_link_reset(bus);
+
+ return 0;
+}
+
+static int skl_resume(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ struct skl *hda = ebus_to_skl(ebus);
+
+ skl_init_pci(hda);
+
+ snd_hdac_bus_init_chip(bus, 1);
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int skl_runtime_suspend(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+
+ dev_dbg(bus->dev, "in %s\n", __func__);
+
+ /* enable controller wake up event */
+ snd_hdac_chip_updatew(bus, WAKEEN, 0, STATESTS_INT_MASK);
+
+ snd_hdac_bus_stop_chip(bus);
+ snd_hdac_bus_enter_link_reset(bus);
+
+ return 0;
+}
+
+static int skl_runtime_resume(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ struct skl *hda = ebus_to_skl(ebus);
+ int status;
+
+ dev_dbg(bus->dev, "in %s\n", __func__);
+
+ /* Read STATESTS before controller reset */
+ status = snd_hdac_chip_readw(bus, STATESTS);
+
+ skl_init_pci(hda);
+ snd_hdac_bus_init_chip(bus, true);
+ /* disable controller Wake Up event */
+ snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, 0);
+
+ return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops skl_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(skl_suspend, skl_resume)
+ SET_RUNTIME_PM_OPS(skl_runtime_suspend, skl_runtime_resume, NULL)
+};
+
+/*
+ * destructor
+ */
+static int skl_free(struct hdac_ext_bus *ebus)
+{
+ struct skl *skl = ebus_to_skl(ebus);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+
+ skl->init_failed = 1; /* to be sure */
+
+ snd_hdac_ext_stop_streams(ebus);
+
+ if (bus->irq >= 0)
+ free_irq(bus->irq, (void *)bus);
+ if (bus->remap_addr)
+ iounmap(bus->remap_addr);
+
+ snd_hdac_bus_free_stream_pages(bus);
+ snd_hdac_stream_free_all(ebus);
+ snd_hdac_link_free_all(ebus);
+ pci_release_regions(skl->pci);
+ pci_disable_device(skl->pci);
+
+ snd_hdac_ext_bus_exit(ebus);
+
+ return 0;
+}
+
+static int skl_dmic_device_register(struct skl *skl)
+{
+ struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
+ struct platform_device *pdev;
+ int ret;
+
+ /* SKL has one dmic port, so allocate dmic device for this */
+ pdev = platform_device_alloc("dmic-codec", -1);
+ if (!pdev) {
+ dev_err(bus->dev, "failed to allocate dmic device\n");
+ return -ENOMEM;
+ }
+
+ ret = platform_device_add(pdev);
+ if (ret) {
+ dev_err(bus->dev, "failed to add dmic device: %d\n", ret);
+ platform_device_put(pdev);
+ return ret;
+ }
+ skl->dmic_dev = pdev;
+
+ return 0;
+}
+
+static void skl_dmic_device_unregister(struct skl *skl)
+{
+ if (skl->dmic_dev)
+ platform_device_unregister(skl->dmic_dev);
+}
+
+/*
+ * Probe the given codec address
+ */
+static int probe_codec(struct hdac_ext_bus *ebus, int addr)
+{
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
+ (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
+ unsigned int res;
+
+ mutex_lock(&bus->cmd_mutex);
+ snd_hdac_bus_send_cmd(bus, cmd);
+ snd_hdac_bus_get_response(bus, addr, &res);
+ mutex_unlock(&bus->cmd_mutex);
+ if (res == -1)
+ return -EIO;
+ dev_dbg(bus->dev, "codec #%d probed OK\n", addr);
+
+ return snd_hdac_ext_bus_device_init(ebus, addr);
+}
+
+/* Codec initialization */
+static int skl_codec_create(struct hdac_ext_bus *ebus)
+{
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ int c, max_slots;
+
+ max_slots = HDA_MAX_CODECS;
+
+ /* First try to probe all given codec slots */
+ for (c = 0; c < max_slots; c++) {
+ if ((bus->codec_mask & (1 << c))) {
+ if (probe_codec(ebus, c) < 0) {
+ /*
+ * Some BIOSen give you wrong codec addresses
+ * that don't exist
+ */
+ dev_warn(bus->dev,
+ "Codec #%d probe error; disabling it...\n", c);
+ bus->codec_mask &= ~(1 << c);
+ /*
+ * More badly, accessing to a non-existing
+ * codec often screws up the controller bus,
+ * and disturbs the further communications.
+ * Thus if an error occurs during probing,
+ * better to reset the controller bus to get
+ * back to the sanity state.
+ */
+ snd_hdac_bus_stop_chip(bus);
+ snd_hdac_bus_init_chip(bus, true);
+ }
+ }
+ }
+
+ return 0;
+}
+
+static const struct hdac_bus_ops bus_core_ops = {
+ .command = snd_hdac_bus_send_cmd,
+ .get_response = snd_hdac_bus_get_response,
+};
+
+/*
+ * constructor
+ */
+static int skl_create(struct pci_dev *pci,
+ const struct hdac_io_ops *io_ops,
+ struct skl **rskl)
+{
+ struct skl *skl;
+ struct hdac_ext_bus *ebus;
+
+ int err;
+
+ *rskl = NULL;
+
+ err = pci_enable_device(pci);
+ if (err < 0)
+ return err;
+
+ skl = devm_kzalloc(&pci->dev, sizeof(*skl), GFP_KERNEL);
+ if (!skl) {
+ pci_disable_device(pci);
+ return -ENOMEM;
+ }
+ ebus = &skl->ebus;
+ snd_hdac_ext_bus_init(ebus, &pci->dev, &bus_core_ops, io_ops);
+ ebus->bus.use_posbuf = 1;
+ skl->pci = pci;
+
+ ebus->bus.bdl_pos_adj = 0;
+
+ *rskl = skl;
+
+ return 0;
+}
+
+static int skl_first_init(struct hdac_ext_bus *ebus)
+{
+ struct skl *skl = ebus_to_skl(ebus);
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ struct pci_dev *pci = skl->pci;
+ int err;
+ unsigned short gcap;
+ int cp_streams, pb_streams, start_idx;
+
+ err = pci_request_regions(pci, "Skylake HD audio");
+ if (err < 0)
+ return err;
+
+ bus->addr = pci_resource_start(pci, 0);
+ bus->remap_addr = pci_ioremap_bar(pci, 0);
+ if (bus->remap_addr == NULL) {
+ dev_err(bus->dev, "ioremap error\n");
+ return -ENXIO;
+ }
+
+ if (skl_acquire_irq(ebus, 0) < 0)
+ return -EBUSY;
+
+ pci_set_master(pci);
+ synchronize_irq(bus->irq);
+
+ gcap = snd_hdac_chip_readw(bus, GCAP);
+ dev_dbg(bus->dev, "chipset global capabilities = 0x%x\n", gcap);
+
+ /* allow 64bit DMA address if supported by H/W */
+ if (!dma_set_mask(bus->dev, DMA_BIT_MASK(64))) {
+ dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(64));
+ } else {
+ dma_set_mask(bus->dev, DMA_BIT_MASK(32));
+ dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(32));
+ }
+
+ /* read number of streams from GCAP register */
+ cp_streams = (gcap >> 8) & 0x0f;
+ pb_streams = (gcap >> 12) & 0x0f;
+
+ if (!pb_streams && !cp_streams)
+ return -EIO;
+
+ ebus->num_streams = cp_streams + pb_streams;
+
+ /* initialize streams */
+ snd_hdac_ext_stream_init_all
+ (ebus, 0, cp_streams, SNDRV_PCM_STREAM_CAPTURE);
+ start_idx = cp_streams;
+ snd_hdac_ext_stream_init_all
+ (ebus, start_idx, pb_streams, SNDRV_PCM_STREAM_PLAYBACK);
+
+ err = snd_hdac_bus_alloc_stream_pages(bus);
+ if (err < 0)
+ return err;
+
+ /* initialize chip */
+ skl_init_pci(skl);
+
+ snd_hdac_bus_init_chip(bus, true);
+
+ /* codec detection */
+ if (!bus->codec_mask) {
+ dev_err(bus->dev, "no codecs found!\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int skl_probe(struct pci_dev *pci,
+ const struct pci_device_id *pci_id)
+{
+ struct skl *skl;
+ struct hdac_ext_bus *ebus = NULL;
+ struct hdac_bus *bus = NULL;
+ int err;
+
+ /* we use ext core ops, so provide NULL for ops here */
+ err = skl_create(pci, NULL, &skl);
+ if (err < 0)
+ return err;
+
+ ebus = &skl->ebus;
+ bus = ebus_to_hbus(ebus);
+
+ err = skl_first_init(ebus);
+ if (err < 0)
+ goto out_free;
+
+ pci_set_drvdata(skl->pci, ebus);
+
+ /* create device for soc dmic */
+ err = skl_dmic_device_register(skl);
+ if (err < 0)
+ goto out_free;
+
+ /* register platform dai and controls */
+ err = skl_platform_register(bus->dev);
+ if (err < 0)
+ goto out_dmic_free;
+
+ /* create codec instances */
+ err = skl_codec_create(ebus);
+ if (err < 0)
+ goto out_unregister;
+
+ /*configure PM */
+ pm_runtime_set_autosuspend_delay(bus->dev, SKL_SUSPEND_DELAY);
+ pm_runtime_use_autosuspend(bus->dev);
+ pm_runtime_put_noidle(bus->dev);
+ pm_runtime_allow(bus->dev);
+
+ return 0;
+
+out_unregister:
+ skl_platform_unregister(bus->dev);
+out_dmic_free:
+ skl_dmic_device_unregister(skl);
+out_free:
+ skl->init_failed = 1;
+ skl_free(ebus);
+
+ return err;
+}
+
+static void skl_remove(struct pci_dev *pci)
+{
+ struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
+ struct skl *skl = ebus_to_skl(ebus);
+
+ if (pci_dev_run_wake(pci))
+ pm_runtime_get_noresume(&pci->dev);
+ pci_dev_put(pci);
+ skl_platform_unregister(&pci->dev);
+ skl_dmic_device_unregister(skl);
+ skl_free(ebus);
+ dev_set_drvdata(&pci->dev, NULL);
+}
+
+/* PCI IDs */
+static const struct pci_device_id skl_ids[] = {
+ /* Sunrise Point-LP */
+ { PCI_DEVICE(0x8086, 0x9d70), 0},
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, skl_ids);
+
+/* pci_driver definition */
+static struct pci_driver skl_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = skl_ids,
+ .probe = skl_probe,
+ .remove = skl_remove,
+ .driver = {
+ .pm = &skl_pm,
+ },
+};
+module_pci_driver(skl_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel Skylake ASoC HDA driver");
projects / firefly-linux-kernel-4.4.55.git / commitdiff