diff options
Diffstat (limited to 'drivers/bluetooth/hci_bcm.c')
| -rw-r--r-- | drivers/bluetooth/hci_bcm.c | 134 |
1 files changed, 120 insertions, 14 deletions
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index ddbd8c6a0ceb..ddbe518c3e5b 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -31,6 +31,7 @@ #include <linux/property.h> #include <linux/platform_data/x86/apple.h> #include <linux/platform_device.h> +#include <linux/regulator/consumer.h> #include <linux/clk.h> #include <linux/gpio/consumer.h> #include <linux/tty.h> @@ -51,8 +52,16 @@ #define BCM_LM_DIAG_PKT 0x07 #define BCM_LM_DIAG_SIZE 63 +#define BCM_TYPE49_PKT 0x31 +#define BCM_TYPE49_SIZE 0 + +#define BCM_TYPE52_PKT 0x34 +#define BCM_TYPE52_SIZE 0 + #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ +#define BCM_NUM_SUPPLIES 2 + /** * struct bcm_device - device driver resources * @serdev_hu: HCI UART controller struct @@ -71,8 +80,10 @@ * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power") * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up") * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down") - * @clk: clock used by Bluetooth device - * @clk_enabled: whether @clk is prepared and enabled + * @txco_clk: external reference frequency clock used by Bluetooth device + * @lpo_clk: external LPO clock used by Bluetooth device + * @supplies: VBAT and VDDIO supplies used by Bluetooth device + * @res_enabled: whether clocks and supplies are prepared and enabled * @init_speed: default baudrate of Bluetooth device; * the host UART is initially set to this baudrate so that * it can configure the Bluetooth device for @oper_speed @@ -102,8 +113,10 @@ struct bcm_device { int gpio_int_idx; #endif - struct clk *clk; - bool clk_enabled; + struct clk *txco_clk; + struct clk *lpo_clk; + struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES]; + bool res_enabled; u32 init_speed; u32 oper_speed; @@ -214,32 +227,59 @@ static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) { int err; - if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) { - err = clk_prepare_enable(dev->clk); + if (powered && !dev->res_enabled) { + err = regulator_bulk_enable(BCM_NUM_SUPPLIES, dev->supplies); if (err) return err; + + /* LPO clock needs to be 32.768 kHz */ + err = clk_set_rate(dev->lpo_clk, 32768); + if (err) { + dev_err(dev->dev, "Could not set LPO clock rate\n"); + goto err_regulator_disable; + } + + err = clk_prepare_enable(dev->lpo_clk); + if (err) + goto err_regulator_disable; + + err = clk_prepare_enable(dev->txco_clk); + if (err) + goto err_lpo_clk_disable; } err = dev->set_shutdown(dev, powered); if (err) - goto err_clk_disable; + goto err_txco_clk_disable; err = dev->set_device_wakeup(dev, powered); if (err) goto err_revert_shutdown; - if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled) - clk_disable_unprepare(dev->clk); + if (!powered && dev->res_enabled) { + clk_disable_unprepare(dev->txco_clk); + clk_disable_unprepare(dev->lpo_clk); + regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies); + } + + /* wait for device to power on and come out of reset */ + usleep_range(10000, 20000); - dev->clk_enabled = powered; + dev->res_enabled = powered; return 0; err_revert_shutdown: dev->set_shutdown(dev, !powered); -err_clk_disable: - if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) - clk_disable_unprepare(dev->clk); +err_txco_clk_disable: + if (powered && !dev->res_enabled) + clk_disable_unprepare(dev->txco_clk); +err_lpo_clk_disable: + if (powered && !dev->res_enabled) + clk_disable_unprepare(dev->lpo_clk); +err_regulator_disable: + if (powered && !dev->res_enabled) + regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies); return err; } @@ -561,12 +601,28 @@ finalize: .lsize = 0, \ .maxlen = BCM_NULL_SIZE +#define BCM_RECV_TYPE49 \ + .type = BCM_TYPE49_PKT, \ + .hlen = BCM_TYPE49_SIZE, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = BCM_TYPE49_SIZE + +#define BCM_RECV_TYPE52 \ + .type = BCM_TYPE52_PKT, \ + .hlen = BCM_TYPE52_SIZE, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = BCM_TYPE52_SIZE + static const struct h4_recv_pkt bcm_recv_pkts[] = { { H4_RECV_ACL, .recv = hci_recv_frame }, { H4_RECV_SCO, .recv = hci_recv_frame }, { H4_RECV_EVENT, .recv = hci_recv_frame }, { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, { BCM_RECV_NULL, .recv = hci_recv_diag }, + { BCM_RECV_TYPE49, .recv = hci_recv_diag }, + { BCM_RECV_TYPE52, .recv = hci_recv_diag }, }; static int bcm_recv(struct hci_uart *hu, const void *data, int count) @@ -896,16 +952,57 @@ static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered) return 0; } +/* Try a bunch of names for TXCO */ +static struct clk *bcm_get_txco(struct device *dev) +{ + struct clk *clk; + + /* New explicit name */ + clk = devm_clk_get(dev, "txco"); + if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) + return clk; + + /* Deprecated name */ + clk = devm_clk_get(dev, "extclk"); + if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) + return clk; + + /* Original code used no name at all */ + return devm_clk_get(dev, NULL); +} + static int bcm_get_resources(struct bcm_device *dev) { const struct dmi_system_id *dmi_id; + int err; dev->name = dev_name(dev->dev); if (x86_apple_machine && !bcm_apple_get_resources(dev)) return 0; - dev->clk = devm_clk_get(dev->dev, NULL); + dev->txco_clk = bcm_get_txco(dev->dev); + + /* Handle deferred probing */ + if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER)) + return PTR_ERR(dev->txco_clk); + + /* Ignore all other errors as before */ + if (IS_ERR(dev->txco_clk)) + dev->txco_clk = NULL; + + dev->lpo_clk = devm_clk_get(dev->dev, "lpo"); + if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER)) + return PTR_ERR(dev->lpo_clk); + + if (IS_ERR(dev->lpo_clk)) + dev->lpo_clk = NULL; + + /* Check if we accidentally fetched the lpo clock twice */ + if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) { + devm_clk_put(dev->dev, dev->txco_clk); + dev->txco_clk = NULL; + } dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup", GPIOD_OUT_LOW); @@ -920,6 +1017,13 @@ static int bcm_get_resources(struct bcm_device *dev) dev->set_device_wakeup = bcm_gpio_set_device_wakeup; dev->set_shutdown = bcm_gpio_set_shutdown; + dev->supplies[0].supply = "vbat"; + dev->supplies[1].supply = "vddio"; + err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES, + dev->supplies); + if (err) + return err; + /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ if (dev->irq <= 0) { struct gpio_desc *gpio; @@ -1314,6 +1418,8 @@ static void bcm_serdev_remove(struct serdev_device *serdev) #ifdef CONFIG_OF static const struct of_device_id bcm_bluetooth_of_match[] = { + { .compatible = "brcm,bcm20702a1" }, + { .compatible = "brcm,bcm4330-bt" }, { .compatible = "brcm,bcm43438-bt" }, { }, }; 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