--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Implementation of per-board codec beeping
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * Copyright 2018 Google LLC
+ */
+
+#define LOG_CATEGORY UCLASS_SOUND
+
+#include <common.h>
+#include <dm.h>
+#include <hda_codec.h>
+#include <pci.h>
+#include <sound.h>
+#include <asm/io.h>
+#include <dt-bindings/sound/azalia.h>
+
+/**
+ * struct hda_regs - HDA registers
+ *
+ * https://wiki.osdev.org/Intel_High_Definition_Audio
+ * https://www.intel.com/content/www/us/en/standards/high-definition-audio-specification.html
+ */
+struct hda_regs {
+ u16 gcap;
+ u8 vmin;
+ u8 vmaj;
+ u16 outpay;
+ u16 inpay;
+ u32 gctl;
+ u16 wakeen;
+ u16 statests;
+ u8 reserved[0x50];
+ u32 cmd; /* 0x60 */
+ u32 resp;
+ u32 icii;
+};
+
+enum {
+ HDA_ICII_BUSY = BIT(0),
+ HDA_ICII_VALID = BIT(1),
+
+ /* Common node IDs */
+ HDA_ROOT_NODE = 0x00,
+
+ /* HDA verbs fields */
+ HDA_VERB_NID_S = 20,
+ HDA_VERB_VERB_S = 8,
+ HDA_VERB_PARAM_S = 0,
+
+ HDA_VERB_GET_PARAMS = 0xf00,
+ HDA_VERB_SET_BEEP = 0x70a,
+
+ /* GET_PARAMS parameter IDs */
+ GET_PARAMS_NODE_COUNT = 0x04,
+ GET_PARAMS_AUDIO_GROUP_CAPS = 0x08,
+ GET_PARAMS_AUDIO_WIDGET_CAPS = 0x09,
+
+ /* Sub-node fields */
+ NUM_SUB_NODES_S = 0,
+ NUM_SUB_NODES_M = 0xff << NUM_SUB_NODES_S,
+ FIRST_SUB_NODE_S = 16,
+ FIRST_SUB_NODE_M = 0xff << FIRST_SUB_NODE_S,
+
+ /* Get Audio Function Group Capabilities fields */
+ AUDIO_GROUP_CAPS_BEEP_GEN = 0x10000,
+
+ /* Get Audio Widget Capabilities fields */
+ AUDIO_WIDGET_TYPE_BEEP = 0x7,
+ AUDIO_WIDGET_TYPE_S = 20,
+ AUDIO_WIDGET_TYPE_M = 0xf << AUDIO_WIDGET_TYPE_S,
+
+ BEEP_FREQ_BASE = 12000,
+};
+
+static inline uint hda_verb(uint nid, uint verb, uint param)
+{
+ return nid << HDA_VERB_NID_S | verb << HDA_VERB_VERB_S |
+ param << HDA_VERB_PARAM_S;
+}
+
+int hda_wait_for_ready(struct hda_regs *regs)
+{
+ int timeout = 1000; /* Use a 1msec timeout */
+
+ while (timeout--) {
+ u32 reg32 = readl(®s->icii);
+
+ if (!(reg32 & HDA_ICII_BUSY))
+ return 0;
+ udelay(1);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int wait_for_response(struct hda_regs *regs, uint *response)
+{
+ int timeout = 1000;
+ u32 reg32;
+
+ /* Send the verb to the codec */
+ setbits_le32(®s->icii, HDA_ICII_BUSY | HDA_ICII_VALID);
+
+ /* Use a 1msec timeout */
+ while (timeout--) {
+ reg32 = readl(®s->icii);
+ if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) ==
+ HDA_ICII_VALID) {
+ if (response)
+ *response = readl(®s->resp);
+ return 0;
+ }
+ udelay(1);
+ }
+
+ return -ETIMEDOUT;
+}
+
+int hda_wait_for_valid(struct hda_regs *regs)
+{
+ return wait_for_response(regs, NULL);
+}
+
+static int set_bits(void *port, u32 mask, u32 val)
+{
+ u32 reg32;
+ int count;
+
+ /* Write (val & mask) to port */
+ clrsetbits_le32(port, mask, val);
+
+ /* Wait for readback of register to match what was just written to it */
+ count = 50;
+ do {
+ /* Wait 1ms based on BKDG wait time */
+ mdelay(1);
+ reg32 = readl(port) & mask;
+ } while (reg32 != val && --count);
+
+ /* Timeout occurred */
+ if (!count)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+int hda_codec_detect(struct hda_regs *regs)
+{
+ uint reg8;
+
+ /* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
+ if (set_bits(®s->gctl, 1, 1))
+ goto no_codec;
+
+ /* Write back the value once reset bit is set */
+ writew(readw(®s->gcap), ®s->gcap);
+
+ /* Read in Codec location */
+ reg8 = readb(®s->statests) & 0xf;
+ if (!reg8)
+ goto no_codec;
+
+ return reg8;
+
+no_codec:
+ /* Codec Not found - put HDA back in reset */
+ set_bits(®s->gctl, 1, 0);
+ log_debug("No codec\n");
+
+ return 0;
+}
+
+static int find_verb_data(struct udevice *dev, uint id, ofnode *nodep)
+{
+ ofnode parent = dev_read_subnode(dev, "codecs");
+ ofnode node;
+ u32 vendor_id, device_id;
+
+ ofnode_for_each_subnode(node, parent) {
+ if (ofnode_read_u32(node, "vendor-id", &vendor_id) ||
+ ofnode_read_u32(node, "device-id", &device_id)) {
+ log_debug("Cannot get IDs for '%s'\n",
+ ofnode_get_name(node));
+ return -EINVAL;
+ }
+ if (id != (vendor_id << 16 | device_id)) {
+ log_debug("Skip codec node '%s' for %08x\n",
+ ofnode_get_name(node), id);
+ continue;
+ }
+
+ log_debug("Found codec node '%s' for %08x\n",
+ ofnode_get_name(node), id);
+ *nodep = node;
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+static int send_verbs(ofnode node, const char *prop_name, struct hda_regs *regs)
+{
+ int ret, verb_size, i;
+ const u32 *verb;
+
+ verb = ofnode_get_property(node, prop_name, &verb_size);
+ if (verb_size < 0) {
+ log_debug("No verb data\n");
+ return -EINVAL;
+ }
+ log_debug("verb_size: %d\n", verb_size);
+
+ for (i = 0; i < verb_size / sizeof(*verb); i++) {
+ ret = hda_wait_for_ready(regs);
+ if (ret) {
+ log_debug(" codec ready timeout\n");
+ return ret;
+ }
+
+ writel(fdt32_to_cpu(verb[i]), ®s->cmd);
+
+ ret = hda_wait_for_valid(regs);
+ if (ret) {
+ log_debug(" codec valid timeout\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int codec_init(struct udevice *dev, struct hda_regs *regs, uint addr)
+{
+ ofnode node;
+ uint id;
+ int ret;
+
+ log_debug("Initializing codec #%d\n", addr);
+ ret = hda_wait_for_ready(regs);
+ if (ret) {
+ log_debug(" codec not ready\n");
+ return ret;
+ }
+
+ /* Read the codec's vendor ID */
+ writel(addr << AZALIA_CODEC_SHIFT |
+ AZALIA_OPCODE_READ_PARAM << AZALIA_VERB_SHIFT |
+ AZALIA_PARAM_VENDOR_ID, ®s->cmd);
+ ret = hda_wait_for_valid(regs);
+ if (ret) {
+ log_debug(" codec not valid\n");
+ return ret;
+ }
+
+ id = readl(®s->resp);
+ log_debug("codec vid/did: %08x\n", id);
+ ret = find_verb_data(dev, id, &node);
+ if (ret) {
+ log_debug("No verb (err=%d)\n", ret);
+ return ret;
+ }
+ ret = send_verbs(node, "verbs", regs);
+ if (ret) {
+ log_debug("failed to send verbs (err=%d)\n", ret);
+ return ret;
+ }
+ log_debug("verb loaded\n");
+
+ return 0;
+}
+
+int hda_codecs_init(struct udevice *dev, struct hda_regs *regs, u32 codec_mask)
+{
+ int ret;
+ int i;
+
+ for (i = 3; i >= 0; i--) {
+ if (codec_mask & (1 << i)) {
+ ret = codec_init(dev, regs, i);
+ if (ret)
+ return ret;
+ }
+ }
+
+ ret = send_verbs(dev_ofnode(dev), "beep-verbs", regs);
+ if (ret) {
+ log_debug("failed to send beep verbs (err=%d)\n", ret);
+ return ret;
+ }
+ log_debug("beep verbs loaded\n");
+
+ return 0;
+}
+
+/**
+ * exec_verb() - Write a verb to the codec
+ *
+ * @regs: HDA registers
+ * @val: Command to write
+ * @response: Set to response from codec
+ * @return 0 if OK, -ve on error
+ */
+static int exec_verb(struct hda_regs *regs, uint val, uint *response)
+{
+ int ret;
+
+ ret = hda_wait_for_ready(regs);
+ if (ret)
+ return ret;
+
+ writel(val, ®s->cmd);
+
+ return wait_for_response(regs, response);
+}
+
+/**
+ * get_subnode_info() - Get subnode information
+ *
+ * @regs: HDA registers
+ * @nid: Parent node ID to check
+ * @num_sub_nodesp: Returns number of subnodes
+ * @start_sub_node_nidp: Returns start subnode number
+ * @return 0 if OK, -ve on error
+ */
+static int get_subnode_info(struct hda_regs *regs, uint nid,
+ uint *num_sub_nodesp, uint *start_sub_node_nidp)
+{
+ uint response;
+ int ret;
+
+ ret = exec_verb(regs, hda_verb(nid, HDA_VERB_GET_PARAMS,
+ GET_PARAMS_NODE_COUNT),
+ &response);
+ if (ret < 0) {
+ printf("Audio: Error reading sub-node info %d\n", nid);
+ return ret;
+ }
+
+ *num_sub_nodesp = (response & NUM_SUB_NODES_M) >> NUM_SUB_NODES_S;
+ *start_sub_node_nidp = (response & FIRST_SUB_NODE_M) >>
+ FIRST_SUB_NODE_S;
+
+ return 0;
+}
+
+/**
+ * find_beep_node_in_group() - Finds the beeping node
+ *
+ * Searches the audio group for a node that supports beeping
+ *
+ * @regs: HDA registers
+ * @group_nid: Group node ID to check
+ * @return 0 if OK, -ve on error
+ */
+static uint find_beep_node_in_group(struct hda_regs *regs, uint group_nid)
+{
+ uint node_count = 0;
+ uint current_nid = 0;
+ uint response;
+ uint end_nid;
+ int ret;
+
+ ret = get_subnode_info(regs, group_nid, &node_count, ¤t_nid);
+ if (ret < 0)
+ return 0;
+
+ end_nid = current_nid + node_count;
+ while (current_nid < end_nid) {
+ ret = exec_verb(regs,
+ hda_verb(current_nid, HDA_VERB_GET_PARAMS,
+ GET_PARAMS_AUDIO_WIDGET_CAPS),
+ &response);
+ if (ret < 0) {
+ printf("Audio: Error reading widget caps\n");
+ return 0;
+ }
+
+ if ((response & AUDIO_WIDGET_TYPE_M) >> AUDIO_WIDGET_TYPE_S ==
+ AUDIO_WIDGET_TYPE_BEEP)
+ return current_nid;
+
+ current_nid++;
+ }
+
+ return 0; /* no beep node found */
+}
+
+/**
+ * audio_group_has_beep_node() - Check if group has a beep node
+ *
+ * Checks if the given audio group contains a beep generator
+ * @regs: HDA registers
+ * @nid: Node ID to check
+ * @return 0 if OK, -ve on error
+ */
+static int audio_group_has_beep_node(struct hda_regs *regs, uint nid)
+{
+ uint response;
+ int ret;
+
+ ret = exec_verb(regs, hda_verb(nid, HDA_VERB_GET_PARAMS,
+ GET_PARAMS_AUDIO_GROUP_CAPS),
+ &response);
+ if (ret < 0) {
+ printf("Audio: Error reading audio group caps %d\n", nid);
+ return 0;
+ }
+
+ return !!(response & AUDIO_GROUP_CAPS_BEEP_GEN);
+}
+
+/**
+ * get_hda_beep_nid() - Finds the node ID of the beep node
+ *
+ * Finds the nid of the beep node if it exists. Starts at the root node, for
+ * each sub-node checks if the group contains a beep node. If the group
+ * contains a beep node, polls each node in the group until it is found.
+ *
+ * If the device has a intel,beep-nid property, the value of that is used
+ * instead.
+ *
+ * @dev: Sound device
+ * @return Node ID >0 if found, -ve error code otherwise
+ */
+static int get_hda_beep_nid(struct udevice *dev)
+{
+ struct hda_codec_priv *priv = dev_get_priv(dev);
+ uint current_nid = 0;
+ uint node_count = 0;
+ uint end_nid;
+ int ret;
+
+ /* If the field exists, use the beep nid set in the fdt */
+ ret = dev_read_u32(dev, "intel,beep-nid", ¤t_nid);
+ if (!ret)
+ return current_nid;
+
+ ret = get_subnode_info(priv->regs, HDA_ROOT_NODE, &node_count,
+ ¤t_nid);
+ if (ret < 0)
+ return ret;
+
+ end_nid = current_nid + node_count;
+ while (current_nid < end_nid) {
+ if (audio_group_has_beep_node(priv->regs, current_nid))
+ return find_beep_node_in_group(priv->regs,
+ current_nid);
+ current_nid++;
+ }
+ /* no beep node found */
+
+ return -ENOENT;
+}
+
+/**
+ * set_beep_divisor() - Sets the beep divisor to set the pitch
+ *
+ * @priv: Device's private data
+ * @divider: Divider value (0 to disable the beep)
+ * @return 0 if OK, -ve on error
+ */
+static int set_beep_divisor(struct hda_codec_priv *priv, uint divider)
+{
+ return exec_verb(priv->regs,
+ hda_verb(priv->beep_nid, HDA_VERB_SET_BEEP, divider),
+ NULL);
+}
+
+int hda_codec_init(struct udevice *dev)
+{
+ struct hda_codec_priv *priv = dev_get_priv(dev);
+ ulong base_addr;
+
+ base_addr = dm_pci_read_bar32(dev, 0);
+ log_debug("base = %08lx\n", base_addr);
+ if (!base_addr)
+ return -EINVAL;
+
+ priv->regs = (struct hda_regs *)base_addr;
+
+ return 0;
+}
+
+int hda_codec_finish_init(struct udevice *dev)
+{
+ struct hda_codec_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = get_hda_beep_nid(dev);
+ if (ret <= 0) {
+ log_warning("Could not find beep NID (err=%d)\n", ret);
+ return ret ? ret : -ENOENT;
+ }
+ priv->beep_nid = ret;
+
+ return 0;
+}
+
+int hda_codec_start_beep(struct udevice *dev, int frequency_hz)
+{
+ struct hda_codec_priv *priv = dev_get_priv(dev);
+ uint divider_val;
+
+ if (!priv->beep_nid) {
+ log_err("Failed to find a beep-capable node\n");
+ return -ENOENT;
+ }
+
+ if (!frequency_hz)
+ divider_val = 0; /* off */
+ else if (frequency_hz > BEEP_FREQ_BASE)
+ divider_val = 1;
+ else if (frequency_hz < BEEP_FREQ_BASE / 0xff)
+ divider_val = 0xff;
+ else
+ divider_val = 0xff & (BEEP_FREQ_BASE / frequency_hz);
+
+ return set_beep_divisor(priv, divider_val);
+}
+
+int hda_codec_stop_beep(struct udevice *dev)
+{
+ struct hda_codec_priv *priv = dev_get_priv(dev);
+
+ return set_beep_divisor(priv, 0);
+}
+
+static const struct sound_ops hda_codec_ops = {
+ .setup = hda_codec_finish_init,
+ .start_beep = hda_codec_start_beep,
+ .stop_beep = hda_codec_stop_beep,
+};
+
+U_BOOT_DRIVER(hda_codec) = {
+ .name = "hda_codec",
+ .id = UCLASS_SOUND,
+ .ops = &hda_codec_ops,
+ .priv_auto_alloc_size = sizeof(struct hda_codec_priv),
+ .probe = hda_codec_init,
+};
+
+static struct pci_device_id hda_supported[] = {
+ { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_HDA},
+ { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_HDA},
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_WILDCATPOINT_HDA) },
+
+ /*
+ * Note this driver is not necessarily generic, but it attempts to
+ * support any codec in the hd-audio class
+ */
+ { PCI_DEVICE_CLASS(PCI_CLASS_MULTIMEDIA_HD_AUDIO, 0xffffff) },
+};
+
+U_BOOT_PCI_DEVICE(hda_codec, hda_supported);
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