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[34.38.134.32]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434da0d6961sm30318525e9.12.2024.12.05.09.41.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Dec 2024 09:41:41 -0800 (PST) From: Tudor Ambarus To: jassisinghbrar@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, alim.akhtar@samsung.com Cc: linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, andre.draszik@linaro.org, kernel-team@android.com, willmcvicker@google.com, peter.griffin@linaro.org, Tudor Ambarus Subject: [PATCH v3 2/3] mailbox: add samsung exynos driver Date: Thu, 5 Dec 2024 17:41:36 +0000 Message-ID: <20241205174137.190545-3-tudor.ambarus@linaro.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241205174137.190545-1-tudor.ambarus@linaro.org> References: <20241205174137.190545-1-tudor.ambarus@linaro.org> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The samsung exynos mailbox controller has 16 flag bits for hardware interrupt generation and a shared register for passing mailbox messages. When the controller is used by the ACPM protocol the shared register is ignored and the mailbox controller acts as a doorbell. The controller just raises the interrupt to APM after the ACPM protocol has written the message to SRAM. Add support for the samsung exynos mailbox controller. Signed-off-by: Tudor Ambarus --- drivers/mailbox/Kconfig | 11 +++ drivers/mailbox/Makefile | 2 + drivers/mailbox/exynos-mailbox.c | 143 +++++++++++++++++++++++++++++++ 3 files changed, 156 insertions(+) create mode 100644 drivers/mailbox/exynos-mailbox.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 8ecba7fb999e..44b808c4d97f 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -36,6 +36,17 @@ config ARM_MHU_V3 that provides different means of transports: supported extensions will be discovered and possibly managed at probe-time. +config EXYNOS_MBOX + tristate "Exynos Mailbox" + depends on ARCH_EXYNOS || COMPILE_TEST + help + Say Y here if you want to build the Samsung Exynos Mailbox controller + driver. The controller has 16 flag bits for hardware interrupt + generation and a shared register for passing mailbox messages. + When the controller is used by the ACPM protocol the shared register + is ignored and the mailbox controller acts as a doorbell that raises + the interrupt to the ACPM firmware. + config IMX_MBOX tristate "i.MX Mailbox" depends on ARCH_MXC || COMPILE_TEST diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 5f4f5b0ce2cc..86192b5c7c32 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -11,6 +11,8 @@ obj-$(CONFIG_ARM_MHU_V2) += arm_mhuv2.o obj-$(CONFIG_ARM_MHU_V3) += arm_mhuv3.o +obj-$(CONFIG_EXYNOS_MBOX) += exynos-mailbox.o + obj-$(CONFIG_IMX_MBOX) += imx-mailbox.o obj-$(CONFIG_ARMADA_37XX_RWTM_MBOX) += armada-37xx-rwtm-mailbox.o diff --git a/drivers/mailbox/exynos-mailbox.c b/drivers/mailbox/exynos-mailbox.c new file mode 100644 index 000000000000..6d4e9b3106b2 --- /dev/null +++ b/drivers/mailbox/exynos-mailbox.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2020 Samsung Electronics Co., Ltd. + * Copyright 2020 Google LLC. + * Copyright 2024 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define EXYNOS_MBOX_MCUCTRL 0x0 /* Mailbox Control Register */ +#define EXYNOS_MBOX_INTCR0 0x24 /* Interrupt Clear Register 0 */ +#define EXYNOS_MBOX_INTMR0 0x28 /* Interrupt Mask Register 0 */ +#define EXYNOS_MBOX_INTSR0 0x2c /* Interrupt Status Register 0 */ +#define EXYNOS_MBOX_INTMSR0 0x30 /* Interrupt Mask Status Register 0 */ +#define EXYNOS_MBOX_INTGR1 0x40 /* Interrupt Generation Register 1 */ +#define EXYNOS_MBOX_INTMR1 0x48 /* Interrupt Mask Register 1 */ +#define EXYNOS_MBOX_INTSR1 0x4c /* Interrupt Status Register 1 */ +#define EXYNOS_MBOX_INTMSR1 0x50 /* Interrupt Mask Status Register 1 */ + +#define EXYNOS_MBOX_INTMR0_MASK GENMASK(15, 0) +#define EXYNOS_MBOX_INTGR1_MASK GENMASK(15, 0) + +#define EXYNOS_MBOX_CHAN_COUNT HWEIGHT32(EXYNOS_MBOX_INTGR1_MASK) + +/** + * struct exynos_mbox - driver's private data. + * @regs: mailbox registers base address. + * @mbox: pointer to the mailbox controller. + * @dev: pointer to the mailbox device. + * @pclk: pointer to the mailbox peripheral clock. + */ +struct exynos_mbox { + void __iomem *regs; + struct mbox_controller *mbox; + struct device *dev; + struct clk *pclk; +}; + +static int exynos_mbox_chan_index(struct mbox_chan *chan) +{ + struct mbox_controller *mbox = chan->mbox; + int i; + + for (i = 0; i < mbox->num_chans; i++) + if (chan == &mbox->chans[i]) + return i; + return -EINVAL; +} + +static int exynos_mbox_send_data(struct mbox_chan *chan, void *data) +{ + struct exynos_mbox *exynos_mbox = dev_get_drvdata(chan->mbox->dev); + int index; + + index = exynos_mbox_chan_index(chan); + if (index < 0) + return index; + + writel_relaxed(BIT(index), exynos_mbox->regs + EXYNOS_MBOX_INTGR1); + + return 0; +} + +static const struct mbox_chan_ops exynos_mbox_chan_ops = { + .send_data = exynos_mbox_send_data, +}; + +static const struct of_device_id exynos_mbox_match[] = { + { .compatible = "google,gs101-acpm-mbox" }, + {}, +}; +MODULE_DEVICE_TABLE(of, exynos_mbox_match); + +static int exynos_mbox_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct exynos_mbox *exynos_mbox; + struct mbox_controller *mbox; + struct mbox_chan *chans; + int i; + + exynos_mbox = devm_kzalloc(dev, sizeof(*exynos_mbox), GFP_KERNEL); + if (!exynos_mbox) + return -ENOMEM; + + mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); + if (!mbox) + return -ENOMEM; + + chans = devm_kcalloc(dev, EXYNOS_MBOX_CHAN_COUNT, sizeof(*chans), + GFP_KERNEL); + if (!chans) + return -ENOMEM; + + exynos_mbox->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(exynos_mbox->regs)) + return PTR_ERR(exynos_mbox->regs); + + exynos_mbox->pclk = devm_clk_get_enabled(dev, "pclk"); + if (IS_ERR(exynos_mbox->pclk)) + return dev_err_probe(dev, PTR_ERR(exynos_mbox->pclk), + "Failed to enable clock.\n"); + + mbox->num_chans = EXYNOS_MBOX_CHAN_COUNT; + mbox->chans = chans; + mbox->dev = dev; + mbox->ops = &exynos_mbox_chan_ops; + + for (i = 0; i < EXYNOS_MBOX_CHAN_COUNT; i++) + chans[i].mbox = mbox; + + exynos_mbox->dev = dev; + exynos_mbox->mbox = mbox; + + platform_set_drvdata(pdev, exynos_mbox); + + /* Mask out all interrupts. We support just polling channels for now. */ + writel_relaxed(EXYNOS_MBOX_INTMR0_MASK, + exynos_mbox->regs + EXYNOS_MBOX_INTMR0); + + return devm_mbox_controller_register(dev, mbox); +} + +static struct platform_driver exynos_mbox_driver = { + .probe = exynos_mbox_probe, + .driver = { + .name = "exynos-acpm-mbox", + .of_match_table = of_match_ptr(exynos_mbox_match), + }, +}; +module_platform_driver(exynos_mbox_driver); + +MODULE_AUTHOR("Tudor Ambarus "); +MODULE_DESCRIPTION("Exynos mailbox driver"); +MODULE_LICENSE("GPL");