From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Balakrishna Godavarthi To: marcel@holtmann.org, johan.hedberg@gmail.com, robh@kernel.org, mka@chromium.org, thierry.escande@linaro.org Cc: linux-bluetooth@vger.kernel.org, rtatiya@codeaurora.org, hemantg@codeaurora.org, linux-arm-msm@vger.kernel.org, Balakrishna Godavarthi Subject: [PATCH v7 8/8] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990 Date: Sat, 16 Jun 2018 11:57:18 +0530 Message-Id: <20180616062718.29844-9-bgodavar@codeaurora.org> In-Reply-To: <20180616062718.29844-1-bgodavar@codeaurora.org> References: <20180616062718.29844-1-bgodavar@codeaurora.org> List-ID: Add support to set voltage/current of various regulators to power up/down Bluetooth chip wcn3990. Signed-off-by: Balakrishna Godavarthi --- changes in v6: * addressed review comments. changes in v6: * Hooked up qca_power to qca_serdev. * renamed all the naming inconsistency functions with qca_* * leveraged common code of ROME for wcn3990. * created wrapper functions for re-usable blocks. * updated function of _*regulator_enable and _*regualtor_disable. * removed redundant comments and functions. * addressed review comments. Changes in v5: * updated regulator vddpa min_uV to 1304000. * addressed review comments. Changes in v4: * Segregated the changes of btqca from hci_qca * rebased all changes on top of bluetooth-next. * addressed review comments. --- drivers/bluetooth/btqca.h | 3 + drivers/bluetooth/hci_qca.c | 327 ++++++++++++++++++++++++++++++++---- 2 files changed, 297 insertions(+), 33 deletions(-) diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h index c7a5d1754f47..d49c1d847e1a 100644 --- a/drivers/bluetooth/btqca.h +++ b/drivers/bluetooth/btqca.h @@ -37,6 +37,9 @@ #define EDL_TAG_ID_HCI (17) #define EDL_TAG_ID_DEEP_SLEEP (27) +#define CHEROKEE_POWERON_PULSE 0xFC +#define CHEROKEE_POWEROFF_PULSE 0xC0 + enum qca_baudrate { QCA_BAUDRATE_115200 = 0, QCA_BAUDRATE_57600, diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 28ae6a17a595..1961e313aae7 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -5,7 +5,7 @@ * protocol extension to H4. * * Copyright (C) 2007 Texas Instruments, Inc. - * Copyright (c) 2010, 2012 The Linux Foundation. All rights reserved. + * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved. * * Acknowledgements: * This file is based on hci_ll.c, which was... @@ -31,9 +31,14 @@ #include #include #include +#include +#include #include #include #include +#include +#include +#include #include #include @@ -119,12 +124,46 @@ struct qca_data { u64 votes_off; }; +/* + * Voltage regulator information required for configuring the + * QCA Bluetooth chipset + */ +struct qca_vreg { + const char *name; + unsigned int min_uV; + unsigned int max_uV; + unsigned int load_uA; +}; + +struct qca_vreg_data { + enum qca_btsoc_type soc_type; + struct qca_vreg *vregs; + size_t num_vregs; +}; + +/* + * Platform data for the QCA Bluetooth power driver. + */ +struct qca_power { + struct device *dev; + const struct qca_vreg_data *vreg_data; + struct regulator_bulk_data *vreg_bulk; + bool vregs_on; +}; + struct qca_serdev { struct hci_uart serdev_hu; struct gpio_desc *bt_en; struct clk *susclk; + enum qca_btsoc_type btsoc_type; + struct qca_power *bt_power; + u32 init_speed; + u32 oper_speed; }; +static int qca_btsoc_power_setup(struct hci_uart *hu, bool on); +static int qca_btsoc_shutdown(struct hci_uart *hu); + static void __serial_clock_on(struct tty_struct *tty) { /* TODO: Some chipset requires to enable UART clock on client @@ -402,6 +441,7 @@ static int qca_open(struct hci_uart *hu) { struct qca_serdev *qcadev; struct qca_data *qca; + int ret = 0; BT_DBG("hu %p qca_open", hu); @@ -463,13 +503,19 @@ static int qca_open(struct hci_uart *hu) serdev_device_open(hu->serdev); qcadev = serdev_device_get_drvdata(hu->serdev); - gpiod_set_value_cansleep(qcadev->bt_en, 1); + if (qcadev->btsoc_type == QCA_WCN3990) { + hu->init_speed = qcadev->init_speed; + hu->oper_speed = qcadev->oper_speed; + ret = qca_btsoc_power_setup(hu, true); + } else { + gpiod_set_value_cansleep(qcadev->bt_en, 1); + } } BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", qca->tx_idle_delay, qca->wake_retrans); - return 0; + return ret; } static void qca_debugfs_init(struct hci_dev *hdev) @@ -549,10 +595,13 @@ static int qca_close(struct hci_uart *hu) qca->hu = NULL; if (hu->serdev) { - serdev_device_close(hu->serdev); - qcadev = serdev_device_get_drvdata(hu->serdev); - gpiod_set_value_cansleep(qcadev->bt_en, 0); + if (qcadev->btsoc_type == QCA_WCN3990) + qca_btsoc_shutdown(hu); + else + gpiod_set_value_cansleep(qcadev->bt_en, 0); + + serdev_device_close(hu->serdev); } kfree_skb(qca->rx_skb); @@ -925,6 +974,32 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) hci_uart_set_baudrate(hu, speed); } +static int qca_send_vendor_cmd(struct hci_dev *hdev, u8 cmd) +{ + struct hci_uart *hu = hci_get_drvdata(hdev); + struct qca_data *qca = hu->priv; + struct sk_buff *skb; + + bt_dev_dbg(hdev, "sending command %02x to SoC", cmd); + + skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); + if (!skb) { + bt_dev_err(hdev, "Failed to allocate memory for skb packet"); + return -ENOMEM; + } + + skb_put_u8(skb, cmd); + hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; + + skb_queue_tail(&qca->txq, skb); + hci_uart_tx_wakeup(hu); + + /* Wait for 100 uS for SoC to settle down */ + usleep_range(100, 200); + + return 0; +} + static void qca_set_init_speed(struct hci_uart *hu) { unsigned int speed = 0; @@ -971,21 +1046,60 @@ static int qca_set_oper_speed(struct hci_uart *hu) return ret; } +static int qca_btsoc_shutdown(struct hci_uart *hu) +{ + struct hci_dev *hdev = hu->hdev; + + host_set_baudrate(hu, 2400); + qca_send_vendor_cmd(hdev, CHEROKEE_POWEROFF_PULSE); + return qca_btsoc_power_setup(hu, false); +} + static int qca_setup(struct hci_uart *hu) { struct hci_dev *hdev = hu->hdev; struct qca_data *qca = hu->priv; + struct qca_serdev *qcadev; unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; int ret; int soc_ver = 0; - bt_dev_info(hdev, "ROME setup"); + qcadev = serdev_device_get_drvdata(hu->serdev); /* Patch downloading has to be done without IBS mode */ clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags); - - /* Setup initial baudrate */ qca_set_init_speed(hu); + + if (qcadev->btsoc_type == QCA_WCN3990) { + bt_dev_dbg(hdev, "setting up wcn3990"); + hci_uart_set_flow_control(hu, true); + ret = qca_send_vendor_cmd(hdev, CHEROKEE_POWERON_PULSE); + if (ret) { + bt_dev_err(hdev, "failed to send power on command"); + return ret; + } + serdev_device_close(hu->serdev); + ret = serdev_device_open(hu->serdev); + if (ret) { + bt_dev_err(hdev, "failed to open port"); + return ret; + } + msleep(100); + qca_set_init_speed(hu); + hci_uart_set_flow_control(hu, false); + ret = qca_read_soc_version(hdev, &soc_ver); + if (ret < 0 || soc_ver == 0) { + bt_dev_err(hdev, "Failed to get version %d", ret); + return ret; + } + + bt_dev_info(hdev, "wcn3990 controller version 0x%08x", soc_ver); + hci_uart_set_flow_control(hu, true); + + } else { + bt_dev_info(hdev, "ROME setup"); + } + /* Setup user speed if needed */ ret = qca_set_oper_speed(hu); if (ret) @@ -995,7 +1109,7 @@ static int qca_setup(struct hci_uart *hu) qca_baudrate = qca_get_baudrate_value(speed); /* Setup patch / NVM configurations */ - ret = qca_uart_setup(hdev, qca_baudrate, QCA_ROME, soc_ver); + ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver); if (!ret) { set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags); qca_debugfs_init(hdev); @@ -1031,9 +1145,118 @@ static struct hci_uart_proto qca_proto = { .dequeue = qca_dequeue, }; +static const struct qca_vreg_data qca_cherokee_data = { + .soc_type = QCA_WCN3990, + .vregs = (struct qca_vreg []) { + { "vddio", 1352000, 1352000, 0 }, + { "vddxtal", 1904000, 2040000, 0 }, + { "vddcore", 1800000, 1800000, 1 }, + { "vddpa", 1304000, 1304000, 1 }, + { "vddldo", 3000000, 3312000, 1 }, + }, + .num_vregs = 5, +}; + +static int qca_enable_regulator(struct qca_vreg vregs, + struct regulator *regulator) +{ + int ret; + + ret = regulator_set_voltage(regulator, vregs.min_uV, + vregs.max_uV); + if (ret) + goto out; + + if (vregs.load_uA) + ret = regulator_set_load(regulator, + vregs.load_uA); + + if (ret) + goto out; + + ret = regulator_enable(regulator); + +out: + return ret; + +} + +static void qca_disable_regulator(struct qca_vreg vregs, + struct regulator *regulator) +{ + regulator_disable(regulator); + regulator_set_voltage(regulator, 0, vregs.max_uV); + if (vregs.load_uA) + regulator_set_load(regulator, 0); + +} + +static int qca_btsoc_power_setup(struct hci_uart *hu, bool on) +{ + struct qca_vreg *vregs; + struct regulator_bulk_data *vreg_bulk; + struct qca_serdev *qcadev; + int i, num_vregs, ret = 0; + + qcadev = serdev_device_get_drvdata(hu->serdev); + if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data || + !qcadev->bt_power->vreg_bulk) + return -EINVAL; + + vregs = qcadev->bt_power->vreg_data->vregs; + vreg_bulk = qcadev->bt_power->vreg_bulk; + num_vregs = qcadev->bt_power->vreg_data->num_vregs; + BT_DBG("on: %d", on); + if (on && !qcadev->bt_power->vregs_on) { + for (i = 0; i < num_vregs; i++) { + ret = qca_enable_regulator(vregs[i], + vreg_bulk[i].consumer); + if (ret) + break; + } + + if (ret) { + BT_ERR("failed to enable regulator:%s", vregs[i].name); + /* turn off regulators which are enabled */ + for (i = i - 1; i >= 0; i--) + qca_disable_regulator(vregs[i], + vreg_bulk[i].consumer); + } else { + qcadev->bt_power->vregs_on = true; + } + } else if (!on && qcadev->bt_power->vregs_on) { + /* turn off regulator in reverse order */ + i = qcadev->bt_power->vreg_data->num_vregs - 1; + for ( ; i >= 0; i--) + qca_disable_regulator(vregs[i], vreg_bulk[i].consumer); + + qcadev->bt_power->vregs_on = false; + } + + return ret; +} + +static int qca_init_regulators(struct qca_power *qca, + const struct qca_vreg *vregs, size_t num_vregs) +{ + int i; + + qca->vreg_bulk = devm_kzalloc(qca->dev, num_vregs * + sizeof(struct regulator_bulk_data), + GFP_KERNEL); + if (!qca->vreg_bulk) + return -ENOMEM; + + for (i = 0; i < num_vregs; i++) + qca->vreg_bulk[i].supply = vregs[i].name; + + return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk); +} + static int qca_serdev_probe(struct serdev_device *serdev) { struct qca_serdev *qcadev; + const struct qca_vreg_data *data; int err; qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); @@ -1041,47 +1264,85 @@ static int qca_serdev_probe(struct serdev_device *serdev) return -ENOMEM; qcadev->serdev_hu.serdev = serdev; + data = of_device_get_match_data(&serdev->dev); + if (data && data->soc_type == QCA_WCN3990) + qcadev->btsoc_type = QCA_WCN3990; + else + qcadev->btsoc_type = QCA_ROME; + serdev_device_set_drvdata(serdev, qcadev); + if (qcadev->btsoc_type == QCA_WCN3990) { + qcadev->bt_power = devm_kzalloc(&serdev->dev, + sizeof(struct qca_power), + GFP_KERNEL); + if (!qcadev->bt_power) + return -ENOMEM; + + qcadev->bt_power->dev = &serdev->dev; + qcadev->bt_power->vreg_data = data; + err = qca_init_regulators(qcadev->bt_power, data->vregs, + data->num_vregs); + if (err) { + BT_ERR("Failed to init regulators:%d", err); + goto out; + } - qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable", - GPIOD_OUT_LOW); - if (IS_ERR(qcadev->bt_en)) { - dev_err(&serdev->dev, "failed to acquire enable gpio\n"); - return PTR_ERR(qcadev->bt_en); - } + qcadev->bt_power->vregs_on = false; + device_property_read_u32(&serdev->dev, "max-speed", + &qcadev->oper_speed); + if (!qcadev->oper_speed) + BT_INFO("UART will pick default operating speed"); + err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); + if (err) { + BT_ERR("wcn3990 serdev registration failed"); + goto out; + } + } else { + qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(qcadev->bt_en)) { + dev_err(&serdev->dev, "failed to acquire enable gpio\n"); + return PTR_ERR(qcadev->bt_en); + } - qcadev->susclk = devm_clk_get(&serdev->dev, NULL); - if (IS_ERR(qcadev->susclk)) { - dev_err(&serdev->dev, "failed to acquire clk\n"); - return PTR_ERR(qcadev->susclk); - } + qcadev->susclk = devm_clk_get(&serdev->dev, NULL); + if (IS_ERR(qcadev->susclk)) { + dev_err(&serdev->dev, "failed to acquire clk\n"); + return PTR_ERR(qcadev->susclk); + } - err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); - if (err) - return err; + err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); + if (err) + return err; - err = clk_prepare_enable(qcadev->susclk); - if (err) - return err; + err = clk_prepare_enable(qcadev->susclk); + if (err) + return err; - err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); - if (err) - clk_disable_unprepare(qcadev->susclk); + err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); + if (err) + clk_disable_unprepare(qcadev->susclk); + } + +out: return err; - return err; } static void qca_serdev_remove(struct serdev_device *serdev) { struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); - hci_uart_unregister_device(&qcadev->serdev_hu); + if (qcadev->btsoc_type == QCA_WCN3990) + qca_btsoc_shutdown(&qcadev->serdev_hu); + else + clk_disable_unprepare(qcadev->susclk); - clk_disable_unprepare(qcadev->susclk); + hci_uart_unregister_device(&qcadev->serdev_hu); } static const struct of_device_id qca_bluetooth_of_match[] = { { .compatible = "qcom,qca6174-bt" }, + { .compatible = "qcom,wcn3990-bt", .data = &qca_cherokee_data}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project