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Add bindings for it. Signed-off-by: Linus Walleij Reviewed-by: Rob Herring (Arm) --- .../devicetree/bindings/leds/brcm,bcmbca-leds.yaml | 88 ++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/brcm,bcmbca-leds.yaml b/Documentation/devicetree/bindings/leds/brcm,bcmbca-leds.yaml new file mode 100644 index 000000000000..7fe2222c0c58 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/brcm,bcmbca-leds.yaml @@ -0,0 +1,88 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/brcm,bcmbca-leds.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Broadcom BCMBCA LEDs + +maintainers: + - Linus Walleij + +description: | + The Broadcom BCA (Broadband Access) SoCs have a LED control + block that can support either parallel (directly connected) + LEDs or serial (connected to 1-4 shift registers) LEDs. + The LEDs can optionally be hardware-triggered by ethernet port + traffic. + +properties: + compatible: + const: brcm,bcmbca-leds + + reg: + maxItems: 1 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + brcm,serial-shifters: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + This describes the number of 8-bit serial shifters + connected to the LED controller block. If this property + is definied, it is implicit that the driver is using + serial LED control, if it is missing, parallel LED + control is assumed. + +patternProperties: + "^led@[0-9a-f]+$": + type: object + $ref: common.yaml# + unevaluatedProperties: false + + properties: + reg: + minimum: 0 + + required: + - reg + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + #include + + soc { + #address-cells = <1>; + #size-cells = <1>; + + led-controller@800 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "brcm,bcmbca-leds"; + reg = <0x800 0xc8>; + + led@0 { + reg = <0>; + active-low; + function = "ext"; + color = ; + }; + + led@1 { + reg = <1>; + active-low; + function = "ext"; + color = ; + }; + }; + }; From patchwork Fri Sep 20 11:15:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 13808482 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 70B39C78829 for ; 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Fri, 20 Sep 2024 04:15:18 -0700 (PDT) Received: from lino.lan ([85.235.12.238]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a90610f452csm838261266b.89.2024.09.20.04.15.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Sep 2024 04:15:17 -0700 (PDT) From: Linus Walleij Date: Fri, 20 Sep 2024 13:15:13 +0200 Subject: [PATCH 2/2] leds: bcmbca: Add new driver for Broadcom BCMBCA MIME-Version: 1.0 Message-Id: <20240920-bcmbca-leds-v1-2-5f70e692c6ff@linaro.org> References: <20240920-bcmbca-leds-v1-0-5f70e692c6ff@linaro.org> In-Reply-To: <20240920-bcmbca-leds-v1-0-5f70e692c6ff@linaro.org> To: Pavel Machek , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , William Zhang , Anand Gore , Kursad Oney , Florian Fainelli , =?utf-8?b?UmFmYcWCIE1p?= =?utf-8?b?xYJlY2tp?= , Broadcom internal kernel review list Cc: linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Linus Walleij X-Mailer: b4 0.14.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240920_041521_023289_221AF21F X-CRM114-Status: GOOD ( 31.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The Broadcom BCA (Broadband Access) SoCs have a LED control block that can support either parallel (directly connected) LEDs or serial (connected to 1-4 shift registers) LEDs. Add a driver for that hardware. Signed-off-by: Linus Walleij --- MAINTAINERS | 7 + drivers/leds/Kconfig | 9 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-bcmbca.c | 391 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 408 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index cc40a9d9b8cd..0a603b72a6a0 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4383,6 +4383,13 @@ N: bcm[9]?6856 N: bcm[9]?6858 N: bcm[9]?6878 +BROADCOM BCMBCA LED DRIVER +M: Linus Walleij +L: linux-leds@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/leds/brcm,bcmbca-leds.yaml +F: drivers/leds/leds-bcmbca.c + BROADCOM BDC DRIVER M: Justin Chen M: Al Cooper diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 8d9d8da376e4..e14c7fa587f0 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -146,6 +146,15 @@ config LEDS_BCM6358 This option enables support for LEDs connected to the BCM6358 LED HW controller accessed via MMIO registers. +config LEDS_BCMBCA + tristate "LED Support for Broadcom BCMBCA" + depends on LEDS_CLASS + depends on HAS_IOMEM + depends on OF + help + This option enables support for LEDs connected to the BCMBCA + LED HW controller accessed via MMIO registers. + config LEDS_CHT_WCOVE tristate "LED support for Intel Cherry Trail Whiskey Cove PMIC" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 18afbb5a23ee..96e036f04e18 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_LEDS_AW200XX) += leds-aw200xx.o obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o +obj-$(CONFIG_LEDS_BCMBCA) += leds-bcmbca.o obj-$(CONFIG_LEDS_BD2606MVV) += leds-bd2606mvv.o obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o diff --git a/drivers/leds/leds-bcmbca.c b/drivers/leds/leds-bcmbca.c new file mode 100644 index 000000000000..74dc4245bea4 --- /dev/null +++ b/drivers/leds/leds-bcmbca.c @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for BCMBCA memory-mapped LEDs + * + * Copyright 2024 Linus Walleij + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define BCMBCA_CTRL 0x00 +#define BCMBCA_CTRL_SERIAL_POL_HIGH BIT(1) +#define BCMBCA_CTRL_ENABLE BIT(3) /* Uncertain about this bit */ +#define BCMBCA_CTRL_SERIAL_MSB_FIRST BIT(4) + +#define BCMBCA_MASK 0x04 +#define BCMBCA_HW_EN 0x08 +/* + * In the serial shift selector, set bits to 1 from BIT(0) and upward all + * set to one until the last LED including any unused slots in the shift + * register. + */ +#define BCMBCA_SERIAL_SHIFT_SEL 0x0c +#define BCMBCA_FLASH_RATE 0x10 /* 4 bits per LED so -> 1c */ +#define BCMBCA_BRIGHTNESS 0x20 /* 4 bits per LED so -> 2c */ +#define BCMBCA_POWER_LED_CFG 0x30 +#define BCMBCA_POWER_LUT 0x34 /* -> b0 */ +#define BCMBCA_HW_POLARITY 0xb4 +#define BCMBCA_SW_DATA 0xb8 /* 1 bit on/off for each LED */ +#define BCMBCA_SW_POLARITY 0xbc +#define BCMBCA_PARALLEL_POLARITY 0xc0 +#define BCMBCA_SERIAL_POLARITY 0xc4 + +#define BCMBCA_LED_MAX_COUNT 32 +#define BCMBCA_LED_MAX_BRIGHTNESS 8 + +enum bcmbca_led_type { + BCMBCA_LED_SERIAL, + BCMBCA_LED_PARALLEL, +}; + +/** + * struct bcmbca_led - state container for bcmbca based LEDs + * @cdev: LED class device for this LED + * @base: memory base address + * @lock: memory lock + * @idx: LED index number + * @active_low: LED is active low + * @num_serial_shifters: number of serial shift registers + * @led_type: whether this is a serial or parallel LED + */ +struct bcmbca_led { + struct led_classdev cdev; + void __iomem *base; + spinlock_t *lock; + unsigned int idx; + bool active_low; + u32 num_serial_shifters; + enum bcmbca_led_type led_type; +}; + +static void bcmbca_led_blink_disable(struct led_classdev *ldev) +{ + struct bcmbca_led *led = + container_of(ldev, struct bcmbca_led, cdev); + /* 8 LEDs per register so integer-divide by 8 */ + u8 led_offset = (led->idx >> 3); + /* Find the 4 bits for each LED */ + u32 led_mask = 0xf << ((led->idx & 0x07) << 2); + u32 val; + + /* Write registers */ + guard(spinlock_irqsave)(led->lock); + val = readl(led->base + BCMBCA_FLASH_RATE + led_offset); + val &= led_mask; + writel(val, led->base + BCMBCA_FLASH_RATE + led_offset); +} + +static int bcmbca_led_blink_set(struct led_classdev *ldev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + struct bcmbca_led *led = + container_of(ldev, struct bcmbca_led, cdev); + u8 led_offset = (led->idx >> 3); + u32 led_mask = 0xf << ((led->idx & 0x07) << 2); + unsigned long period; + u32 led_val; + u32 val; + + /* Friendly defaults as specified in the documentation */ + if (*delay_on == 0 && *delay_off == 0) { + *delay_on = 240; + *delay_off = 240; + } + + if (*delay_on != *delay_off) { + dev_dbg(ldev->dev, "only square blink supported\n"); + return -EINVAL; + } + + period = *delay_on + *delay_off; + if (period > 2000) { + dev_dbg(ldev->dev, "period too long, %lu max 2000 ms\n", + period); + return -EINVAL; + } + + if (period <= 60) + led_val = 1; + else if (period <= 120) + led_val = 2; + else if (period <= 240) + led_val = 3; + else if (period <= 480) + led_val = 4; + else if (period <= 960) + led_val = 5; + else if (period <= 1920) + led_val = 6; + else + led_val = 7; + + led_val = led_val << ((led->idx & 0x07) << 2); + + /* Write registers */ + guard(spinlock_irqsave)(led->lock); + val = readl(led->base + BCMBCA_FLASH_RATE + led_offset); + val &= led_mask; + val |= led_val; + writel(val, led->base + BCMBCA_FLASH_RATE + led_offset); + + return 0; +} + +static void bcmbca_led_set(struct led_classdev *ldev, + enum led_brightness value) +{ + struct bcmbca_led *led = + container_of(ldev, struct bcmbca_led, cdev); + u8 led_offset = (led->idx >> 3); + u32 led_mask = 0xf << ((led->idx & 0x07) << 2); + u32 led_val = value << ((led->idx & 0x07) << 2); + u32 val; + + dev_dbg(ldev->dev, "LED%u, register %08x, mask %08x, value %08x\n", + led->idx, BCMBCA_BRIGHTNESS + led_offset, led_mask, led_val); + + /* Write registers */ + guard(spinlock_irqsave)(led->lock); + + /* Parallel LEDs support brightness control */ + if (led->led_type == BCMBCA_LED_PARALLEL) { + val = readl(led->base + BCMBCA_BRIGHTNESS + led_offset); + val &= led_mask; + val |= led_val; + writel(val, led->base + BCMBCA_BRIGHTNESS + led_offset); + } + + /* Software control on/off */ + if (value == LED_OFF) { + val = readl(led->base + BCMBCA_SW_DATA); + val &= ~BIT(led->idx); + writel(val, led->base + BCMBCA_SW_DATA); + bcmbca_led_blink_disable(ldev); + } else { + val = readl(led->base + BCMBCA_SW_DATA); + val |= BIT(led->idx); + writel(val, led->base + BCMBCA_SW_DATA); + } +} + +static u8 bcmbca_led_get(void __iomem *base, int idx) +{ + u8 led_offset = (idx >> 3); + u32 led_mask = 0xf << ((idx & 0x07) << 2); + u32 val; + + /* Called marshalled so no lock needed */ + val = readl(base + BCMBCA_BRIGHTNESS + led_offset); + return ((val & led_mask) >> ((idx & 0x07) << 2)); +} + +static int bcmbca_led_probe(struct device *dev, struct device_node *np, u32 reg, + void __iomem *base, spinlock_t *lock, + u32 num_shifters, enum bcmbca_led_type led_type) +{ + struct led_init_data init_data = {}; + struct bcmbca_led *led; + enum led_default_state state; + u32 val; + int rc; + + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->idx = reg; + led->base = base; + led->lock = lock; + + if (of_property_read_bool(np, "active-low")) + led->active_low = true; + + init_data.fwnode = of_fwnode_handle(np); + + if (led->led_type == BCMBCA_LED_PARALLEL) + led->cdev.max_brightness = BCMBCA_LED_MAX_BRIGHTNESS; + else + led->cdev.max_brightness = LED_ON; + + state = led_init_default_state_get(init_data.fwnode); + + switch (state) { + case LEDS_DEFSTATE_ON: + led->cdev.brightness = led->cdev.max_brightness; + break; + case LEDS_DEFSTATE_KEEP: + val = bcmbca_led_get(base, led->idx); + if (val) + led->cdev.brightness = val; + else + led->cdev.brightness = LED_OFF; + break; + default: + led->cdev.brightness = LED_OFF; + break; + } + + /* + * Polarity inversion setting per-LED + * The default is actually active low, we set a bit to 1 + * in the register to make it active high. + */ + if (!of_property_read_bool(np, "active-low")) { + switch (led_type) { + case BCMBCA_LED_SERIAL: + val = readl(base + BCMBCA_SERIAL_POLARITY); + val |= BIT(led->idx); + writel(val, base + BCMBCA_SERIAL_POLARITY); + break; + case BCMBCA_LED_PARALLEL: + val = readl(base + BCMBCA_PARALLEL_POLARITY); + val |= BIT(led->idx); + writel(val, base + BCMBCA_PARALLEL_POLARITY); + break; + default: + break; + } + } + + /* Initial brightness setup */ + bcmbca_led_set(&led->cdev, led->cdev.brightness); + + led->cdev.brightness_set = bcmbca_led_set; + led->cdev.blink_set = bcmbca_led_blink_set; + /* TODO: implement HW control */ + + rc = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); + if (rc < 0) + return rc; + + dev_info(dev, "registered LED %s\n", led->cdev.name); + + return 0; +} + +static int bcmbca_leds_probe(struct platform_device *pdev) +{ + unsigned int max_leds = BCMBCA_LED_MAX_COUNT; + struct device *dev = &pdev->dev; + struct device_node *np = dev_of_node(&pdev->dev); + enum bcmbca_led_type led_type; + void __iomem *base; + spinlock_t *lock; /* memory lock */ + u32 num_shifters; + u32 val; + int ret; + int i; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL); + if (!lock) + return -ENOMEM; + + ret = of_property_read_u32(np, "brcm,serial-shifters", &num_shifters); + if (!ret) { + /* Serial LEDs */ + dev_dbg(dev, "serial LEDs, %d shift registers used\n", num_shifters); + led_type = BCMBCA_LED_SERIAL; + /* + * Each shifter can handle maximum 8 LEDs so we cap the + * maximum LEDs we can handle at that. + */ + max_leds = num_shifters * 8; + } else { + /* Parallel LEDs */ + led_type = BCMBCA_LED_PARALLEL; + dev_info(dev, "parallel LEDs requested, this is untested\n"); + } + + spin_lock_init(lock); + + /* Turn off all LEDs and let the driver deal with them */ + writel(0, base + BCMBCA_HW_EN); + writel(0, base + BCMBCA_SERIAL_POLARITY); + writel(0, base + BCMBCA_PARALLEL_POLARITY); + + /* Set up serial shift register */ + switch (num_shifters) { + case 0: + val = 0; + break; + case 1: + val = 0x000000ff; + break; + case 2: + val = 0x0000ffff; + break; + case 3: + val = 0x00ffffff; + break; + case 4: + val = 0xffffffff; + break; + } + writel(val, base + BCMBCA_SERIAL_SHIFT_SEL); + + /* ??? */ + writel(0xc0000000, base + BCMBCA_HW_POLARITY); + /* Initialize to max brightness */ + for (i = 0; i < BCMBCA_LED_MAX_COUNT/8; i++) { + writel(0x88888888, base + BCMBCA_BRIGHTNESS + 4*i); + writel(0, base + BCMBCA_BRIGHTNESS + BCMBCA_FLASH_RATE + 4*i); + } + + for_each_available_child_of_node_scoped(np, child) { + u32 reg; + + if (of_property_read_u32(child, "reg", ®)) + continue; + + if (reg >= max_leds) { + dev_err(dev, "invalid LED (%u >= %d)\n", reg, + max_leds); + continue; + } + + ret = bcmbca_led_probe(dev, child, reg, base, lock, + num_shifters, led_type); + if (ret < 0) + return ret; + } + + /* Enable the LEDs */ + val = BCMBCA_CTRL_ENABLE | BCMBCA_CTRL_SERIAL_POL_HIGH; + if (of_property_read_bool(np, "brcm,serial-active-low")) + val &= ~BCMBCA_CTRL_SERIAL_POL_HIGH; + writel(val, base + BCMBCA_CTRL); + + return 0; +} + +static const struct of_device_id bcmbca_leds_of_match[] = { + { .compatible = "brcm,bcmbca-leds", }, + { }, +}; +MODULE_DEVICE_TABLE(of, bcmbca_leds_of_match); + +static struct platform_driver bcmbca_leds_driver = { + .probe = bcmbca_leds_probe, + .driver = { + .name = "leds-bcmbca", + .of_match_table = bcmbca_leds_of_match, + }, +}; + +module_platform_driver(bcmbca_leds_driver); + +MODULE_AUTHOR("Linus Walleij "); +MODULE_DESCRIPTION("LED driver for BCMBCA LED controllers"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:leds-bcmbca");