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Thu, 19 Nov 2020 10:04:40 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Thu, 19 Nov 2020 10:04:37 -0700 From: To: , , , , , , Subject: [PATCH 4/6] soc: add polarfire soc system controller Date: Thu, 19 Nov 2020 17:04:37 +0000 Message-ID: <20201119170437.18519-1-conor.dooley@microchip.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201119_120443_314446_C658E5FF X-CRM114-Status: GOOD ( 20.76 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: cyril.jean@microchip.com, david.abdurachmanov@gmail.com, daire.mcnamara@microchip.com, anup.patel@wdc.com, atish.patra@wdc.com, Conor Dooley , lewis.hanly@microchip.com Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Conor Dooley This driver provides an interface for other drivers to access the functions of the system controller on the Microchip PolarFire SoC. Signed-off-by: Conor Dooley --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/microchip/Kconfig | 10 ++ drivers/soc/microchip/Makefile | 1 + drivers/soc/microchip/mpfs_sys_controller.c | 136 ++++++++++++++++++++ 5 files changed, 149 insertions(+) create mode 100644 drivers/soc/microchip/Kconfig create mode 100644 drivers/soc/microchip/Makefile create mode 100644 drivers/soc/microchip/mpfs_sys_controller.c diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 425ab6f7e375..22cb097bcbdc 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -9,6 +9,7 @@ source "drivers/soc/bcm/Kconfig" source "drivers/soc/fsl/Kconfig" source "drivers/soc/imx/Kconfig" source "drivers/soc/ixp4xx/Kconfig" +source "drivers/soc/microchip/Kconfig" source "drivers/soc/mediatek/Kconfig" source "drivers/soc/qcom/Kconfig" source "drivers/soc/renesas/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 36452bed86ef..fb084cf2d12e 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_ARCH_GEMINI) += gemini/ obj-y += imx/ obj-$(CONFIG_ARCH_IXP4XX) += ixp4xx/ obj-$(CONFIG_SOC_XWAY) += lantiq/ +obj-$(CONFIG_SOC_MICROCHIP_POLARFIRE) += microchip/ obj-y += mediatek/ obj-y += amlogic/ obj-y += qcom/ diff --git a/drivers/soc/microchip/Kconfig b/drivers/soc/microchip/Kconfig new file mode 100644 index 000000000000..8fdba8b5eae3 --- /dev/null +++ b/drivers/soc/microchip/Kconfig @@ -0,0 +1,10 @@ +config MPFS_SYS_CONTROLLER + tristate "MPFS_SYS_CONTROLLER" + depends on MPFS_MBOX + help + This driver adds support for the Polarfire SoC system controller. + + To compile this driver as a module, choose M here. the + module will be called mpfs_system_controller. + + If unsure, say Y. diff --git a/drivers/soc/microchip/Makefile b/drivers/soc/microchip/Makefile new file mode 100644 index 000000000000..23b1f42a37db --- /dev/null +++ b/drivers/soc/microchip/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_MPFS_SYS_CONTROLLER) += mpfs_sys_controller.o diff --git a/drivers/soc/microchip/mpfs_sys_controller.c b/drivers/soc/microchip/mpfs_sys_controller.c new file mode 100644 index 000000000000..0074ae529a2e --- /dev/null +++ b/drivers/soc/microchip/mpfs_sys_controller.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Microchip MPFS system controller driver + * + * Copyright (c) 2020 Microchip Corporation. All rights reserved. + * + * Author: Conor Dooley + * + */ + +#include +#include +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(transaction_lock); + +struct mpfs_sys_controller { + struct mbox_client client; + struct mbox_chan *chan; + struct completion c; + u32 enabled; + void *response; + u16 response_size_bytes; +}; + +int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, void *msg, + void *response, u16 response_size_bytes) +{ + int ret; + + mpfs_client->response = response; + mpfs_client->response_size_bytes = response_size_bytes; + + mutex_lock_interruptible(&transaction_lock); + + reinit_completion(&mpfs_client->c); + + ret = mbox_send_message(mpfs_client->chan, msg); + + if (ret >= 0U) { + if (wait_for_completion_timeout(&mpfs_client->c, HZ)) { + ret = 0U; + } else { + ret = -ETIMEDOUT; + WARN_ONCE(1, "MPFS sys controller transaction timeout"); + } + } else { + dev_err(mpfs_client->client.dev, + "mpfs sys controller transaction returned %d\r\n", ret); + } + + mutex_unlock(&transaction_lock); + + return ret; +} +EXPORT_SYMBOL(mpfs_blocking_transaction); + +static void rx_callback(struct mbox_client *client, void *msg) +{ + struct mpfs_sys_controller *mpfs_client = + container_of(client, struct mpfs_sys_controller, client); + + memcpy(mpfs_client->response, (u8 *)msg, + mpfs_client->response_size_bytes); + + complete(&mpfs_client->c); +} + +static int mpfs_sys_controller_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mpfs_sys_controller *mpfs_client; + + mpfs_client = devm_kzalloc(dev, sizeof(*mpfs_client), GFP_KERNEL); + if (!mpfs_client) + return -ENOMEM; + + mpfs_client->client.dev = dev; + mpfs_client->client.rx_callback = rx_callback; + mpfs_client->client.tx_block = 1U; + + mpfs_client->chan = mbox_request_channel_byname(&mpfs_client->client, + "mbox-mpfs"); + if (IS_ERR(mpfs_client->chan)) { + int ret = PTR_ERR(mpfs_client->chan); + + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get mbox channel: %d\n", ret); + return ret; + } + + init_completion(&mpfs_client->c); + + platform_set_drvdata(pdev, mpfs_client); + + dev_info(&pdev->dev, "Registered MPFS system controller driver\n"); + + return 0; +} + +struct mpfs_sys_controller * +mpfs_sys_controller_get(struct device_node *mss_node) +{ + struct platform_device *pdev = of_find_device_by_node(mss_node); + + if (!pdev) + return NULL; + + return platform_get_drvdata(pdev); +} +EXPORT_SYMBOL(mpfs_sys_controller_get); + +static const struct of_device_id mpfs_sys_controller_of_match[] = { + { + .compatible = "microchip,polarfire-soc-sys-controller", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, mpfs_sys_controller_of_match); + +static struct platform_driver mpfs_sys_controller_driver = { + .driver = { + .name = "mpfs-sys-controller", + .of_match_table = mpfs_sys_controller_of_match, + }, + .probe = mpfs_sys_controller_probe, +}; +module_platform_driver(mpfs_sys_controller_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Conor Dooley "); +MODULE_DESCRIPTION("MPFS system controller driver");