From patchwork Fri Aug 24 19:59:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ajay Gupta X-Patchwork-Id: 10575785 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9CF9D921 for ; Fri, 24 Aug 2018 20:00:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8A7C02C9C6 for ; Fri, 24 Aug 2018 20:00:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7E22B2CA63; Fri, 24 Aug 2018 20:00:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 44AED2C9C6 for ; Fri, 24 Aug 2018 20:00:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726855AbeHXXgH (ORCPT ); Fri, 24 Aug 2018 19:36:07 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:16669 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726675AbeHXXgH (ORCPT ); Fri, 24 Aug 2018 19:36:07 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 24 Aug 2018 12:59:58 -0700 Received: from HQMAIL105.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Fri, 24 Aug 2018 13:00:02 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Fri, 24 Aug 2018 13:00:02 -0700 Received: from BGMAIL101.nvidia.com (10.25.59.10) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 24 Aug 2018 20:00:00 +0000 Received: from ajayg.nvidia.com (172.17.171.117) by bgmail101.nvidia.com (10.25.59.10) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 24 Aug 2018 19:59:55 +0000 From: Ajay Gupta To: , CC: , , Ajay Gupta Subject: [PATCH 1/2] i2c: buses: add i2c bus driver for NVIDIA GPU Date: Fri, 24 Aug 2018 12:59:46 -0700 Message-ID: <1535140787-10599-1-git-send-email-ajayg@nvidia.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [172.17.171.117] X-ClientProxiedBy: BGMAIL104.nvidia.com (10.25.59.13) To bgmail101.nvidia.com (10.25.59.10) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Latest NVIDIA GPU card has USB Type-C interface. There is a Type-C controller which can be accessed over I2C. This driver add I2C bus driver to communicate with Type-C controller. I2C client driver will be part of USB Type-C UCSI driver. Signed-off-by: Ajay Gupta --- Documentation/i2c/busses/i2c-gpu | 18 ++ MAINTAINERS | 7 + drivers/i2c/busses/Kconfig | 9 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-gpu.c | 493 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 528 insertions(+) create mode 100644 Documentation/i2c/busses/i2c-gpu create mode 100644 drivers/i2c/busses/i2c-gpu.c diff --git a/Documentation/i2c/busses/i2c-gpu b/Documentation/i2c/busses/i2c-gpu new file mode 100644 index 0000000..873ba34 --- /dev/null +++ b/Documentation/i2c/busses/i2c-gpu @@ -0,0 +1,18 @@ +Kernel driver i2c-gpu + +Datasheet: not publicly available. + +Authors: + Ajay Gupta + +Description +----------- + +i2c-gpu is a driver for I2C controller included in NVIDIA Turing and later +GPUs and it is used to communicate with Type-C controller on GPUs. + +If your 'lspci -v' listing shows something like the following, + +01:00.3 Serial bus controller [0c80]: NVIDIA Corporation Device 1ad9 (rev a1) + +then this driver should support the I2C controller of your GPU. diff --git a/MAINTAINERS b/MAINTAINERS index efb08d7..ee137de 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6781,6 +6781,13 @@ L: linux-acpi@vger.kernel.org S: Maintained F: drivers/i2c/i2c-core-acpi.c +I2C CONTROLLER DRIVER FOR NVIDIA GPU +M: Ajay Gupta +L: linux-i2c@vger.kernel.org +S: Maintained +F: Documentation/i2c/busses/i2c-gpu +F: drivers/i2c/busses/i2c-gpu.c + I2C MUXES M: Peter Rosin L: linux-i2c@vger.kernel.org diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 451d4ae..ff8b2d4 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -224,6 +224,15 @@ config I2C_NFORCE2_S4985 This driver can also be built as a module. If so, the module will be called i2c-nforce2-s4985. +config I2C_GPU + tristate "NVIDIA GPU I2C controller" + depends on PCI + help + If you say yes to this option, support will be included for the + NVIDIA GPU I2C controller which is used to communicate with the GPU's + Type-C controller. This driver can also be built as a module called + i2c-gpu.ko. + config I2C_SIS5595 tristate "SiS 5595" depends on PCI diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 18b26af..15d2894 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -140,5 +140,6 @@ obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o obj-$(CONFIG_SCx200_ACB) += scx200_acb.o obj-$(CONFIG_I2C_FSI) += i2c-fsi.o +obj-$(CONFIG_I2C_GPU) += i2c-gpu.o ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG diff --git a/drivers/i2c/busses/i2c-gpu.c b/drivers/i2c/busses/i2c-gpu.c new file mode 100644 index 0000000..0fd2944 --- /dev/null +++ b/drivers/i2c/busses/i2c-gpu.c @@ -0,0 +1,493 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nvidia GPU I2C controller Driver + * + * Copyright (C) 2018 NVIDIA Corporation. All rights reserved. + * Author: Ajay Gupta + * + */ +#include +#include +#include +#include +#include +#include +#include +#include + +/* STATUS definitions */ +#define STATUS_SUCCESS 0 +#define STATUS_UNSUCCESSFUL 0x80000000UL +#define STATUS_TIMEOUT 0x80000001UL +#define STATUS_IO_DEVICE_ERROR 0x80000002UL +#define STATUS_IO_TIMEOUT 0x80000004UL +#define STATUS_IO_PREEMPTED 0x80000008UL + +/* Cypress Type-C controllers (CCGx) device */ +#define CCGX_I2C_DEV_ADDRESS 0x08 + +/* I2C definitions */ +#define I2C_MST_CNTL 0x00 +#define I2C_MST_CNTL_GEN_START (1 << 0) +#define I2C_MST_CNTL_GEN_STOP (1 << 1) +#define I2C_MST_CNTL_CMD_NONE (0 << 2) +#define I2C_MST_CNTL_CMD_READ (1 << 2) +#define I2C_MST_CNTL_CMD_WRITE (2 << 2) +#define I2C_MST_CNTL_CMD_RESET (3 << 2) +#define I2C_MST_CNTL_GEN_RAB (1 << 4) +#define I2C_MST_CNTL_BURST_SIZE_SHIFT (6) +#define I2C_MST_CNTL_GEN_NACK (1 << 28) +#define I2C_MST_CNTL_STATUS (3 << 29) +#define I2C_MST_CNTL_STATUS_OKAY (0 << 29) +#define I2C_MST_CNTL_STATUS_NO_ACK (1 << 29) +#define I2C_MST_CNTL_STATUS_TIMEOUT (2 << 29) +#define I2C_MST_CNTL_STATUS_BUS_BUSY (3 << 29) +#define I2C_MST_CNTL_CYCLE_TRIGGER (1 << 31) + +#define I2C_MST_ADDR 0x04 +#define I2C_MST_ADDR_DAB 0 + +#define I2C_MST_I2C0_TIMING 0x08 +#define I2C_MST_I2C0_TIMING_SCL_PERIOD_100KHZ (0x10e << 0) +#define I2C_MST_I2C0_TIMING_SCL_PERIOD_200KHZ (0x087 << 0) +#define I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT 16 +#define I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT_MAX 255 +#define I2C_MST_I2C0_TIMING_TIMEOUT_CHECK (1 << 24) + +#define I2C_MST_DATA 0x0c + +#define I2C_MST_HYBRID_PADCTL 0x20 +#define I2C_MST_HYBRID_PADCTL_MODE_I2C (1 << 0) +#define I2C_MST_HYBRID_PADCTL_I2C_SCL_INPUT_RCV (1 << 14) +#define I2C_MST_HYBRID_PADCTL_I2C_SDA_INPUT_RCV (1 << 15) + +/* PCI driver data */ +struct gpu_i2c_dev { + struct pci_dev *pci_dev; + void __iomem *regs; + struct i2c_adapter adapter; + struct i2c_client *client; + struct mutex mutex; + bool do_start; +}; + +static void enable_i2c_bus(struct gpu_i2c_dev *gdev) +{ + struct device *dev = &gdev->pci_dev->dev; + u32 val; + + /* enable I2C */ + val = readl(gdev->regs + I2C_MST_HYBRID_PADCTL); + val |= I2C_MST_HYBRID_PADCTL_MODE_I2C | + I2C_MST_HYBRID_PADCTL_I2C_SCL_INPUT_RCV | + I2C_MST_HYBRID_PADCTL_I2C_SDA_INPUT_RCV; + + dev_dbg(dev, "%s: %p (I2C_MST_HYBRID_PADCTL) <- %08x", __func__, + (gdev->regs + I2C_MST_HYBRID_PADCTL), val); + + writel(val, gdev->regs + I2C_MST_HYBRID_PADCTL); + + /* enable 100KHZ mode */ + val = 0; + val |= I2C_MST_I2C0_TIMING_SCL_PERIOD_100KHZ; + val |= (I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT_MAX + << I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT); + val |= I2C_MST_I2C0_TIMING_TIMEOUT_CHECK; + + dev_dbg(dev, "%s: %p (I2C_MST_I2C0_TIMING) <- %08x", __func__, + gdev->regs + I2C_MST_I2C0_TIMING, val); + writel(val, gdev->regs + I2C_MST_I2C0_TIMING); +} + +static u32 i2c_check_status(struct gpu_i2c_dev *gdev) +{ + struct device *dev = &gdev->pci_dev->dev; + unsigned long target = jiffies + msecs_to_jiffies(1000); + u32 status = STATUS_UNSUCCESSFUL; + u32 val; + + while (time_is_after_jiffies(target)) { + val = readl(gdev->regs + I2C_MST_CNTL); + if ((val & I2C_MST_CNTL_CYCLE_TRIGGER) != + I2C_MST_CNTL_CYCLE_TRIGGER) + break; + if ((val & I2C_MST_CNTL_STATUS) != + I2C_MST_CNTL_STATUS_BUS_BUSY) + break; + usleep_range(1000, 2000); + } + + if (time_is_before_jiffies(target)) { + dev_err(dev, "%si2c timeout", __func__); + return status; + } + + val = readl(gdev->regs + I2C_MST_CNTL); + switch (val & I2C_MST_CNTL_STATUS) { + case I2C_MST_CNTL_STATUS_OKAY: + status = STATUS_SUCCESS; + break; + case I2C_MST_CNTL_STATUS_NO_ACK: + status = STATUS_IO_DEVICE_ERROR; + break; + case I2C_MST_CNTL_STATUS_TIMEOUT: + status = STATUS_IO_TIMEOUT; + break; + case I2C_MST_CNTL_STATUS_BUS_BUSY: + status = STATUS_IO_PREEMPTED; + break; + default: + break; + } + return status; +} + +static u32 i2c_read(struct gpu_i2c_dev *gdev, u8 *data, u16 len) +{ + struct device *dev = &gdev->pci_dev->dev; + u32 status; + u32 val = 0; + + val |= I2C_MST_CNTL_GEN_START | I2C_MST_CNTL_GEN_STOP | + I2C_MST_CNTL_CMD_READ | (len << I2C_MST_CNTL_BURST_SIZE_SHIFT) | + I2C_MST_CNTL_CYCLE_TRIGGER | I2C_MST_CNTL_GEN_NACK; + val &= ~I2C_MST_CNTL_GEN_RAB; + writel(val, gdev->regs + I2C_MST_CNTL); + + status = i2c_check_status(gdev); + if (status == STATUS_UNSUCCESSFUL) { + dev_err(dev, "%s failed\n", __func__); + return status; + } + + val = readl(gdev->regs + I2C_MST_DATA); + switch (len) { + case 1: + data[0] = (val >> 0) & 0xff; + break; + case 2: + data[0] = (val >> 8) & 0xff; + data[1] = (val >> 0) & 0xff; + break; + case 3: + data[0] = (val >> 16) & 0xff; + data[1] = (val >> 8) & 0xff; + data[2] = (val >> 0) & 0xff; + break; + case 4: + data[0] = (val >> 24) & 0xff; + data[1] = (val >> 16) & 0xff; + data[2] = (val >> 8) & 0xff; + data[3] = (val >> 0) & 0xff; + break; + default: + break; + } + return status; +} + +static u32 i2c_manual_start(struct gpu_i2c_dev *gdev, u16 addr) +{ + u32 val = 0; + + val = addr << I2C_MST_ADDR_DAB; + writel(val, gdev->regs + I2C_MST_ADDR); + + val = 0; + val |= I2C_MST_CNTL_GEN_START | I2C_MST_CNTL_CMD_NONE | + I2C_MST_CNTL_GEN_NACK; + val &= ~(I2C_MST_CNTL_GEN_STOP | I2C_MST_CNTL_GEN_RAB); + writel(val, gdev->regs + I2C_MST_CNTL); + + return i2c_check_status(gdev); +} + +static u32 i2c_manual_stop(struct gpu_i2c_dev *gdev) +{ + u32 val = 0; + + val |= I2C_MST_CNTL_GEN_STOP | I2C_MST_CNTL_CMD_NONE | + I2C_MST_CNTL_GEN_NACK; + val &= ~(I2C_MST_CNTL_GEN_START | I2C_MST_CNTL_GEN_RAB); + writel(val, gdev->regs + I2C_MST_CNTL); + + return i2c_check_status(gdev); +} + +static u32 i2c_manual_write(struct gpu_i2c_dev *gdev, u8 data) +{ + u32 val = 0; + + writel(data, gdev->regs + I2C_MST_DATA); + + val |= I2C_MST_CNTL_CMD_WRITE | (1 << I2C_MST_CNTL_BURST_SIZE_SHIFT) | + I2C_MST_CNTL_GEN_NACK; + val &= ~(I2C_MST_CNTL_GEN_START | I2C_MST_CNTL_GEN_STOP + | I2C_MST_CNTL_GEN_RAB); + writel(val, gdev->regs + I2C_MST_CNTL); + + return i2c_check_status(gdev); +} + +/* gdev i2c adapter */ +static int gpu_i2c_master_xfer(struct i2c_adapter *adap, + struct i2c_msg *msgs, int num) +{ + struct gpu_i2c_dev *gdev = i2c_get_adapdata(adap); + struct device *dev = &gdev->pci_dev->dev; + int retry1b = 10; + u32 status; + int i, j; + + dev_dbg(dev, "%s: adap %p msgs %p num %d\n", __func__, adap, msgs, num); + + mutex_lock(&gdev->mutex); + + for (i = 0; i < num; i++) { + if (msgs[i].flags & I2C_M_RD) { +retry2: + status = i2c_read(gdev, msgs[i].buf, msgs[i].len); + if (status != STATUS_SUCCESS) { + dev_err(dev, + "%s:%d i2c_read failed %08lx", __func__, + __LINE__, (unsigned long)status); + + if (--retry1b > 0) { + usleep_range(10000, 11000); + goto retry2; + } + break; + } + gdev->do_start = true; + } else if (msgs[i].flags & I2C_M_STOP) { + status = i2c_manual_stop(gdev); + if (status != STATUS_SUCCESS) { + dev_err(dev, + "%s:%d i2c_manual_stop failed %08lx", __func__, + __LINE__, (unsigned long)status); + goto exit; + } + gdev->do_start = true; + } else { + dev_dbg(dev, "!I2C_M_RD start %d len %d\n", + gdev->do_start, msgs[i].len); + if (gdev->do_start) { + status = i2c_manual_start(gdev, msgs[i].addr); + if (status != STATUS_SUCCESS) { + dev_err(dev, + "%s:%d i2c_manual_start failed %08lx", + __func__, __LINE__, + (unsigned long)status); + goto exit; + } + status = i2c_manual_write(gdev, + msgs[i].addr << 1); + if (status != STATUS_SUCCESS) { + dev_err(dev, + "%s:%d i2c_manual_write failed %08lx", + __func__, __LINE__, + (unsigned long)status); + goto exit_stop; + } + gdev->do_start = false; + } + for (j = 0; j < msgs[i].len; j++) { + status = i2c_manual_write(gdev, + *(msgs[i].buf + j)); + if (status != STATUS_SUCCESS) { + dev_err(dev, + "%s:%d i2c_manual_write failed %08lx", + __func__, __LINE__, + (unsigned long)status); + goto exit_stop; + } + } + } + } + goto exit; +exit_stop: + status = i2c_manual_stop(gdev); + if (status != STATUS_SUCCESS) + dev_err(dev, "i2c_manual_stop failed %x", status); +exit: + mutex_unlock(&gdev->mutex); + return i; +} + +static u32 gpu_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm gpu_i2c_algorithm = { + .master_xfer = gpu_i2c_master_xfer, + .functionality = gpu_i2c_functionality, +}; + +static int gpu_i2c_dev_init(struct gpu_i2c_dev *gdev) +{ + gdev->do_start = true; + + /* initialize mutex */ + mutex_init(&gdev->mutex); + + /* initialize i2c */ + enable_i2c_bus(gdev); + + return 0; +} + +struct i2c_board_info gpu_i2c_ucsi_board_info = { + I2C_BOARD_INFO("i2c-gpu-ucsi", CCGX_I2C_DEV_ADDRESS), +}; + +#define PCI_CLASS_SERIAL_UNKNOWN 0x0c80 +/* pci driver */ +static const struct pci_device_id gpu_i2c_ids[] = { + { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, + PCI_CLASS_SERIAL_UNKNOWN << 8, 0xffffff00}, + { }, +}; +MODULE_DEVICE_TABLE(pci, gpu_i2c_ids); + +static int gpu_i2c_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + struct gpu_i2c_dev *gdev; + int status; + + dev_info(&dev->dev, + "dev %p id %08x %08x sub %08x %08x class %08x %08x\n", + dev, id->vendor, id->device, id->subvendor, id->subdevice, + id->class, id->class_mask); + + gdev = devm_kzalloc(&dev->dev, sizeof(struct gpu_i2c_dev), GFP_KERNEL); + if (!gdev) + return -ENOMEM; + + gdev->pci_dev = dev; + pci_set_drvdata(dev, gdev); + + status = pci_enable_device(dev); + if (status < 0) { + dev_err(&dev->dev, "pci_enable_device failed - %d\n", status); + return status; + } + + pci_set_master(dev); + + gdev->regs = pci_iomap(dev, 0, 0); + if (!gdev->regs) { + dev_err(&dev->dev, "pci_iomap failed\n"); + status = -ENOMEM; + goto iomap_err; + } + + status = pci_enable_msi(dev); + if (status < 0) { + dev_err(&dev->dev, "pci_enable_msi failed - %d\n", status); + goto enable_msi_err; + } + + status = gpu_i2c_dev_init(gdev); + if (status < 0) { + dev_err(&dev->dev, "gpu_i2c_dev_init failed - %d\n", status); + goto i2c_init_err; + } + + i2c_set_adapdata(&gdev->adapter, gdev); + gdev->adapter.owner = THIS_MODULE; + strlcpy(gdev->adapter.name, "NVIDIA GPU I2C adapter", + sizeof(gdev->adapter.name)); + gdev->adapter.algo = &gpu_i2c_algorithm; + gdev->adapter.dev.parent = &dev->dev; + status = i2c_add_adapter(&gdev->adapter); + if (status < 0) { + dev_err(&dev->dev, "i2c_add_adapter failed - %d\n", status); + goto add_adapter_err; + } + + gpu_i2c_ucsi_board_info.irq = dev->irq; + gdev->client = i2c_new_device(&gdev->adapter, + &gpu_i2c_ucsi_board_info); + + if (!gdev->client) { + dev_err(&dev->dev, "i2c_new_device failed - %d\n", status); + status = -ENODEV; + goto add_adapter_err; + } + + dev_set_drvdata(&dev->dev, gdev); + pm_runtime_put_noidle(&dev->dev); + pm_runtime_allow(&dev->dev); + + return 0; + +add_adapter_err: + i2c_del_adapter(&gdev->adapter); +i2c_init_err: + pci_disable_msi(dev); +enable_msi_err: + pci_iounmap(dev, gdev->regs); +iomap_err: + pci_disable_device(dev); + return status; +} + +static void gpu_i2c_remove(struct pci_dev *dev) +{ + struct gpu_i2c_dev *gdev = pci_get_drvdata(dev); + + i2c_del_adapter(&gdev->adapter); + pci_disable_msi(dev); + pci_iounmap(dev, gdev->regs); +} + +static int gpu_i2c_suspend(struct device *dev) +{ + dev_dbg(dev, "%s\n", __func__); + + return 0; +} + +static int gpu_i2c_resume(struct device *dev) +{ + struct gpu_i2c_dev *gdev = dev_get_drvdata(dev); + + dev_dbg(dev, "%s\n", __func__); + + enable_i2c_bus(gdev); + + return 0; +} + +static int gpu_i2c_idle(struct device *dev) +{ + struct gpu_i2c_dev *gdev = dev_get_drvdata(dev); + + if (!mutex_trylock(&gdev->mutex)) { + dev_info(dev, "%s: -EBUSY\n", __func__); + return -EBUSY; + } + mutex_unlock(&gdev->mutex); + + return 0; +} + +UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, gpu_i2c_suspend, gpu_i2c_resume, + gpu_i2c_idle); + +static struct pci_driver gpu_i2c_driver = { + .name = "gpu_i2c_driver", + .id_table = gpu_i2c_ids, + .probe = gpu_i2c_probe, + .remove = gpu_i2c_remove, + .driver = { + .pm = &gpu_i2c_driver_pm, + }, +}; + +module_pci_driver(gpu_i2c_driver); + +MODULE_AUTHOR("Ajay Gupta "); +MODULE_DESCRIPTION("Nvidia GPU I2C controller Driver"); +MODULE_LICENSE("GPL v2"); From patchwork Fri Aug 24 19:59:47 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ajay Gupta X-Patchwork-Id: 10575787 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E79B5920 for ; Fri, 24 Aug 2018 20:00:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D555B2CA53 for ; Fri, 24 Aug 2018 20:00:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C96442CA85; Fri, 24 Aug 2018 20:00:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BE3662CA53 for ; Fri, 24 Aug 2018 20:00:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727385AbeHXXgO (ORCPT ); Fri, 24 Aug 2018 19:36:14 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:14228 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726675AbeHXXgO (ORCPT ); Fri, 24 Aug 2018 19:36:14 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 24 Aug 2018 13:00:06 -0700 Received: from HQMAIL104.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Fri, 24 Aug 2018 13:00:07 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Fri, 24 Aug 2018 13:00:07 -0700 Received: from BGMAIL101.nvidia.com (10.25.59.10) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 24 Aug 2018 20:00:05 +0000 Received: from ajayg.nvidia.com (172.17.171.117) by bgmail101.nvidia.com (10.25.59.10) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 24 Aug 2018 20:00:01 +0000 From: Ajay Gupta To: , CC: , , Ajay Gupta Subject: [PATCH 2/2] usb: typec: ucsi: add support for Cypress CCGx Date: Fri, 24 Aug 2018 12:59:47 -0700 Message-ID: <1535140787-10599-2-git-send-email-ajayg@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1535140787-10599-1-git-send-email-ajayg@nvidia.com> References: <1535140787-10599-1-git-send-email-ajayg@nvidia.com> MIME-Version: 1.0 X-Originating-IP: [172.17.171.117] X-ClientProxiedBy: BGMAIL104.nvidia.com (10.25.59.13) To bgmail101.nvidia.com (10.25.59.10) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Latest NVIDIA GPU cards have a Cypress CCGx Type-C controller over I2C interface. This UCSI I2C driver uses I2C bus driver interface for communicating with Type-C controller. Signed-off-by: Ajay Gupta --- drivers/usb/typec/ucsi/Kconfig | 10 + drivers/usb/typec/ucsi/Makefile | 2 + drivers/usb/typec/ucsi/ucsi_i2c_ccg.c | 591 ++++++++++++++++++++++++++++++++++ 3 files changed, 603 insertions(+) create mode 100644 drivers/usb/typec/ucsi/ucsi_i2c_ccg.c diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig index e36d6c7..5136aeb 100644 --- a/drivers/usb/typec/ucsi/Kconfig +++ b/drivers/usb/typec/ucsi/Kconfig @@ -23,6 +23,16 @@ config TYPEC_UCSI if TYPEC_UCSI +config UCSI_I2C_CCG + tristate "UCSI I2C Interface Driver for Cypress CCGx" + depends on I2C_GPU + help + This driver enables UCSI support on NVIDIA GPUs that expose a + Cypress CCGx Type-C controller over I2C interface. + + To compile the driver as a module, choose M here: the module will be + called ucsi_i2c_ccg.ko. + config UCSI_ACPI tristate "UCSI ACPI Interface Driver" depends on ACPI diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile index 7afbea5..4439482 100644 --- a/drivers/usb/typec/ucsi/Makefile +++ b/drivers/usb/typec/ucsi/Makefile @@ -8,3 +8,5 @@ typec_ucsi-y := ucsi.o typec_ucsi-$(CONFIG_TRACING) += trace.o obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o + +obj-$(CONFIG_UCSI_I2C_CCG) += ucsi_i2c_ccg.o diff --git a/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c b/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c new file mode 100644 index 0000000..587e3f8 --- /dev/null +++ b/drivers/usb/typec/ucsi/ucsi_i2c_ccg.c @@ -0,0 +1,591 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UCSI I2C driver for Cypress CCGx Type-C controller + * + * Copyright (C) 2017-2018 NVIDIA Corporation. All rights reserved. + * Author: Ajay Gupta + * + * Some code borrowed from drivers/usb/typec/ucsi/ucsi_acpi.c + */ +#include +#include +#include +#include +#include +#include +#include "ucsi.h" + +struct ucsi_i2c_ccg { + struct device *dev; + struct ucsi *ucsi; + struct ucsi_ppm ppm; + struct i2c_client *client; + int irq; + bool wake_enabled; + unsigned char ver; +}; + +#define CCGX_I2C_RAB_DEVICE_MODE 0x0000U +#define CCGX_I2C_RAB_BOOT_MODE_REASON 0x0001U +#define CCGX_I2C_RAB_READ_SILICON_ID 0x0002U +#define CCGX_I2C_RAB_INTR_REG 0x0006U +#define CCGX_I2C_RAB_RESET 0x0008U +#define CCGX_I2C_RAB_READ_ALL_VERSION 0x0010U +#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER \ + (CCGX_I2C_RAB_READ_ALL_VERSION + 0x00) +#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER_BASE \ + (CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER + 0) +#define CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER_FW \ + (CCGX_I2C_RAB_READ_ALL_VERSION_BOOTLOADER + 4) +#define CCGX_I2C_RAB_READ_ALL_VERSION_APP \ + (CCGX_I2C_RAB_READ_ALL_VERSION + 0x08) +#define CCGX_I2C_RAB_READ_ALL_VERSION_APP_BASE \ + (CCGX_I2C_RAB_READ_ALL_VERSION_APP + 0) +#define CCGX_I2C_RAB_READ_ALL_VERSION_APP_FW \ + (CCGX_I2C_RAB_READ_ALL_VERSION_APP + 4) +#define CCGX_I2C_RAB_FW2_VERSION 0x0020U +#define CCGX_I2C_RAB_PDPORT_ENABLE 0x002CU +#define CCGX_I2C_RAB_UCSI_STATUS 0x0038U +#define CCGX_I2C_RAB_UCSI_CONTROL 0x0039U +#define CCGX_I2C_RAB_UCSI_CONTROL_STOP 0x2U +#define CCGX_I2C_RAB_UCSI_CONTROL_START 0x1U +#define CCGX_I2C_RAB_HPI_VERSION 0x003CU +#define CCGX_I2C_RAB_RESPONSE_REG 0x007EU +#define CCGX_I2C_RAB_DM_CONTROL_1 0x1000U +#define CCGX_I2C_RAB_WRITE_DATA_MEMORY_1 0x1800U +#define CCGX_I2C_RAB_DM_CONTROL_2 0x2000U +#define CCGX_I2C_RAB_WRITE_DATA_MEMORY_2 0x2800U +#define CCGX_I2C_RAB_UCSI_DATA_BLOCK 0xf000U + +#define CCGX_I2C_RAB_RESPONSE_REG_RESET_COMPLETE 0x80 + +static int ccg_read(struct ucsi_i2c_ccg *ui, u16 rab, u8 *data, u32 len) +{ + struct device *dev = ui->dev; + struct i2c_client *client = ui->client; + unsigned char buf[2]; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0x0, + .len = 0x2, + .buf = buf, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .buf = data, + }, + }; + u32 rlen, rem_len = len; + int err; + + while (rem_len > 0) { + msgs[1].buf = &data[len - rem_len]; + rlen = min_t(u16, rem_len, 4); + msgs[1].len = rlen; + buf[0] = (rab >> 0) & 0xff; + buf[1] = (rab >> 8) & 0xff; + err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (err == ARRAY_SIZE(msgs)) { + err = 0; + } else if (err >= 0) { + dev_err(dev, "%s i2c_transfer failed, err %d\n", + __func__, err); + return -EIO; + } + rab += rlen; + rem_len -= rlen; + } + + return err; +} + +static int ccg_write(struct ucsi_i2c_ccg *ui, u16 rab, u8 *data, u32 len) +{ + struct device *dev = ui->dev; + struct i2c_client *client = ui->client; + unsigned char buf[2]; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0x0, + .len = 0x2, + .buf = buf, + }, + { + .addr = client->addr, + .flags = 0x0, + .buf = data, + .len = len, + }, + { + .addr = client->addr, + .flags = I2C_M_STOP, + }, + }; + int err; + + buf[0] = (rab >> 0) & 0xff; + buf[1] = (rab >> 8) & 0xff; + err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (err == ARRAY_SIZE(msgs)) { + err = 0; + } else if (err >= 0) { + dev_err(dev, "%s i2c_transfer failed, err %d\n", + __func__, err); + return -EIO; + } + + return err; +} + +static int ucsi_i2c_ccg_init(struct ucsi_i2c_ccg *ui) +{ + struct device *dev = ui->dev; + u8 data[64]; + int i, err; + + /* selectively issue device reset + * - if RESPONSE register is RESET_COMPLETE, do not issue device reset + * (will cause usb device disconnect / reconnect) + * - if RESPONSE register is not RESET_COMPLETE, issue device reset + * (causes PPC to resync device connect state by re-issuing + * set mux command) + */ + data[0] = 0x00; + data[1] = 0x00; + + err = ccg_read(ui, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + dev_info(dev, "CCGX_I2C_RAB_RESPONSE_REG %02x", data[0]); + + /* read device mode */ + memset(data, 0, sizeof(data)); + + err = ccg_read(ui, CCGX_I2C_RAB_DEVICE_MODE, data, sizeof(data)); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + dev_info(dev, "[DEVICE_MODE] %02x (HPIv%c) (Flash row size %d)\n", + data[CCGX_I2C_RAB_DEVICE_MODE], + ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 7) & 0x01) ? '2' : '1', + ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 4) & 0x03) ? 256 : 128); + + dev_info(dev, "(PD ports %d) (Firmware mode %d)\n", + ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 2) & 0x03) ? 2 : 1, + ((data[CCGX_I2C_RAB_DEVICE_MODE] >> 0) & 0x03)); + + dev_info(dev, "[BOOT_MODE_REASON] %02x (Boot mode requested %d)\n", + data[CCGX_I2C_RAB_BOOT_MODE_REASON], + ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 0) & 0x01) ? 1 : 0); + + dev_info(dev, "(FW1 valid %d) (FW2 valid %d)\n", + ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 2) & 0x01) ? 1 : 0, + ((data[CCGX_I2C_RAB_BOOT_MODE_REASON] >> 3) & 0x01) ? 1 : 0); + + dev_info(dev, "[READ_SILICON_ID] %02x %02x", + data[CCGX_I2C_RAB_READ_SILICON_ID+0], + data[CCGX_I2C_RAB_READ_SILICON_ID+1]); + + dev_info(dev, "[READ_ALL_VERSION][BOOTLOADER]\n"); + dev_info(dev, "%02x %02x %02x %02x %02x %02x %02x %02x\n", + data[CCGX_I2C_RAB_READ_ALL_VERSION+0], + data[CCGX_I2C_RAB_READ_ALL_VERSION+1], + data[CCGX_I2C_RAB_READ_ALL_VERSION+2], + data[CCGX_I2C_RAB_READ_ALL_VERSION+3], + data[CCGX_I2C_RAB_READ_ALL_VERSION+4], + data[CCGX_I2C_RAB_READ_ALL_VERSION+5], + data[CCGX_I2C_RAB_READ_ALL_VERSION+6], + data[CCGX_I2C_RAB_READ_ALL_VERSION+7]); + + dev_info(dev, "[READ_ALL_VERSION][FW1]\n"); + dev_info(dev, "%02x %02x %02x %02x %02x %02x %02x %02x\n", + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+0], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+1], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+2], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+3], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+4], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+5], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+6], + data[CCGX_I2C_RAB_READ_ALL_VERSION+8+7]); + + dev_info(dev, "[FW2_VERSION] %02x %02x %02x %02x %02x %02x %02x %02x\n", + data[CCGX_I2C_RAB_FW2_VERSION+0], + data[CCGX_I2C_RAB_FW2_VERSION+1], + data[CCGX_I2C_RAB_FW2_VERSION+2], + data[CCGX_I2C_RAB_FW2_VERSION+3], + data[CCGX_I2C_RAB_FW2_VERSION+4], + data[CCGX_I2C_RAB_FW2_VERSION+5], + data[CCGX_I2C_RAB_FW2_VERSION+6], + data[CCGX_I2C_RAB_FW2_VERSION+7]); + + /* read response register */ + data[0] = 0x0; + data[1] = 0x0; + + err = ccg_read(ui, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + if (data[0] != CCGX_I2C_RAB_RESPONSE_REG_RESET_COMPLETE) { + dev_info(dev, "response (%02x %02x) != reset_complete", + data[0], data[1]); + } + + /* stop UCSI */ + err = ccg_write(ui, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1); + if (err < 0) { + dev_err(dev, "%s ccg_write failed, err %d\n", __func__, err); + return -EIO; + } + + msleep(500); + + /* start UCSI */ + data[0] = CCGX_I2C_RAB_UCSI_CONTROL_START; + err = ccg_write(ui, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1); + if (err < 0) { + dev_err(dev, "%s ccg_write failed, err %d\n", __func__, err); + return -EIO; + } + + msleep(500); + + /* test read-1 */ + err = ccg_read(ui, CCGX_I2C_RAB_UCSI_DATA_BLOCK, data, 0x2); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + /* test read-2 */ + err = ccg_read(ui, 0xf004, data, 0x4); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + /* test read-3 */ + err = ccg_read(ui, 0xf010, data, 0x10); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + /* flush CCGx RESPONSE queue by acking interrupts + * - above ucsi control register write will push response + * which must be flushed + * - affects f/w update which reads response register + */ + data[0] = 0xff; + for (i = 0; (i < 10) && (data[0] != 0x00); i++) { + dev_dbg(dev, "flushing response %02x\n", data[0]); + + err = ccg_write(ui, CCGX_I2C_RAB_INTR_REG, data, 0x1); + if (err < 0) { + dev_err(dev, "%s ccg_write failed, err %d\n", + __func__, err); + return -EIO; + } + + usleep_range(10000, 11000); + + err = ccg_read(ui, CCGX_I2C_RAB_INTR_REG, data, 0x1); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + } + + /* get i2c slave firmware version + * - [0..1] = Application name (ASCII "nb" for notebook) + * - [2] = external circuil specific version + * - [3] bit 0...3 = minor version + * - [3] bit 4...7 = major version + */ + err = ccg_read(ui, 0x0, data, 0x4); + if (err < 0) { + dev_err(dev, "%s ccg_read failed, err %d\n", __func__, err); + return -EIO; + } + + ui->ver = data[3]; + + dev_info(dev, "version %d.%d\n", (ui->ver >> 4) & 0x0f, + (ui->ver >> 0) & 0x0f); + + return 0; +} + +static int ucsi_i2c_ccg_send_data(struct ucsi_i2c_ccg *ui) +{ + int err; + unsigned char buf[4] = { + 0x20, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x8, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + }; + unsigned char buf1[16]; + unsigned char buf2[8]; + + memcpy(&buf1[0], ((const void *) ui->ppm.data) + 0x20, sizeof(buf1)); + memcpy(&buf2[0], ((const void *) ui->ppm.data) + 0x8, sizeof(buf2)); + + err = ccg_write(ui, *(u16 *)buf, buf1, sizeof(buf1)); + if (err < 0) { + dev_err(ui->dev, "%s ccg_write failed, err %d\n", + __func__, err); + return -EIO; + } + + err = ccg_write(ui, *(u16 *)(buf+2), buf2, sizeof(buf2)); + if (err < 0) { + dev_err(ui->dev, "%s ccg_write failed, err %d\n", + __func__, err); + return -EIO; + } + + return err; +} + +static int ucsi_i2c_ccg_recv_data(struct ucsi_i2c_ccg *ui) +{ + static int first = 1; + int err; + unsigned char buf[6] = { + 0x0, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x4, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x10, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + }; + u8 *ppm = (u8 *)ui->ppm.data; + + if (first) { + err = ccg_read(ui, *(u16 *)buf, ppm, 0x2); + if (err < 0) { + dev_err(ui->dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + first = 1; + } + + err = ccg_read(ui, *(u16 *)(buf + 2), ppm + 0x4, 0x4); + if (err < 0) { + dev_err(ui->dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + + err = ccg_read(ui, *(u16 *)(buf + 4), ppm + 0x10, 0x10); + if (err < 0) { + dev_err(ui->dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + + return err; +} + +static int ucsi_i2c_ccg_ack_interrupt(struct ucsi_i2c_ccg *ui) +{ + int err; + unsigned char buf[3] = {(CCGX_I2C_RAB_INTR_REG & 0xff), + (CCGX_I2C_RAB_INTR_REG >> 8), 0x0}; + + err = ccg_read(ui, *(u16 *)buf, &buf[2], 0x1); + if (err < 0) { + dev_err(ui->dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + + err = ccg_write(ui, *(u16 *)buf, &buf[2], 0x1); + if (err < 0) { + dev_err(ui->dev, "%s ccg_read failed, err %d\n", + __func__, err); + return -EIO; + } + + return err; +} + +static int ucsi_i2c_ccg_sync(struct ucsi_ppm *ppm) +{ + struct ucsi_i2c_ccg *ui = container_of(ppm, + struct ucsi_i2c_ccg, ppm); + int err; + + err = ucsi_i2c_ccg_recv_data(ui); + if (err < 0) { + dev_err(ui->dev, "%s: ucsi_i2c_ccg_recv_data() err %d\n", + __func__, err); + goto exit; + } + + /* ack interrupt to allow next command to run */ + err = ucsi_i2c_ccg_ack_interrupt(ui); + if (err < 0) { + dev_err(ui->dev, "%s: ucsi_i2c_ccg_ack_interrupt() err %d\n", + __func__, err); + } +exit: + return 0; +} + +static int ucsi_i2c_ccg_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl) +{ + struct ucsi_i2c_ccg *ui = container_of(ppm, + struct ucsi_i2c_ccg, ppm); + int err = 0; + + ppm->data->ctrl.raw_cmd = ctrl->raw_cmd; + err = ucsi_i2c_ccg_send_data(ui); + + return err; +} + +static irqreturn_t i2c_ccg_irq_handler(int irq, void *data) +{ + struct ucsi_i2c_ccg *ui = data; + + dev_dbg(ui->dev, "%s irq %d data %p ui %p\n", + __func__, irq, data, ui); + + if (!ui) { + dev_err(ui->dev, "%s: !ui\n", __func__); + return IRQ_HANDLED; + } + + ucsi_notify(ui->ucsi); + + return IRQ_HANDLED; +} + +static int ucsi_i2c_ccg_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct ucsi_i2c_ccg *ui; + int status; + + ui = devm_kzalloc(dev, sizeof(*ui), GFP_KERNEL); + if (!ui) + return -ENOMEM; + + ui->ppm.data = devm_kzalloc(dev, sizeof(struct ucsi_data), GFP_KERNEL); + if (!ui->ppm.data) + return -ENOMEM; + + ui->ppm.cmd = ucsi_i2c_ccg_cmd; + ui->ppm.sync = ucsi_i2c_ccg_sync; + ui->dev = dev; + ui->client = client; + + /* reset i2c device and initialize ucsi */ + status = ucsi_i2c_ccg_init(ui); + if (status < 0) { + dev_err(ui->dev, "%s: ucsi_i2c_ccg_init failed - %d\n", + __func__, status); + return status; + } + + ui->irq = client->irq; + + status = devm_request_threaded_irq(dev, ui->irq, NULL, + i2c_ccg_irq_handler, IRQF_ONESHOT | IRQF_TRIGGER_HIGH, + dev_name(dev), ui); + if (status < 0) { + dev_err(ui->dev, "%s: request_irq failed - %d\n", + __func__, status); + return status; + } + + ui->ucsi = ucsi_register_ppm(dev, &ui->ppm); + if (IS_ERR(ui->ucsi)) { + dev_err(ui->dev, "ucsi_register_ppm failed\n"); + return PTR_ERR(ui->ucsi); + } + + i2c_set_clientdata(client, ui); + return 0; +} + +static int ucsi_i2c_ccg_remove(struct i2c_client *client) +{ + struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client); + + ucsi_unregister_ppm(ui->ucsi); + + return 0; +} + +static int ucsi_i2c_ccg_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client); + int err; + + if (device_may_wakeup(dev)) { + err = enable_irq_wake(ui->irq); + if (!err) + ui->wake_enabled = true; + } + return 0; +} + +static int ucsi_i2c_ccg_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ucsi_i2c_ccg *ui = i2c_get_clientdata(client); + struct ucsi_control c; + int ret; + + if (device_may_wakeup(dev) && ui->wake_enabled) { + disable_irq_wake(ui->irq); + ui->wake_enabled = false; + } + + /* restore UCSI notification enable mask */ + UCSI_CMD_SET_NTFY_ENABLE(c, UCSI_ENABLE_NTFY_ALL); + ret = ucsi_run_command(ui->ucsi, &c, NULL, 0); + if (ret) { + dev_err(ui->dev, "%s: failed to set notification enable - %d\n", + __func__, ret); + } + + return 0; +} + +UNIVERSAL_DEV_PM_OPS(ucsi_i2c_ccg_driver_pm, ucsi_i2c_ccg_suspend, + ucsi_i2c_ccg_resume, NULL); + +static const struct i2c_device_id ucsi_i2c_ccg_device_id[] = { + {"i2c-gpu-ucsi", 0}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ucsi_i2c_ccg_device_id); + +static struct i2c_driver ucsi_i2c_ccg_driver = { + .driver = { + .name = "ucsi_i2c_ccg", + .pm = &ucsi_i2c_ccg_driver_pm, + }, + .probe = ucsi_i2c_ccg_probe, + .remove = ucsi_i2c_ccg_remove, + .id_table = ucsi_i2c_ccg_device_id, +}; + +module_i2c_driver(ucsi_i2c_ccg_driver); + +MODULE_AUTHOR("Ajay Gupta "); +MODULE_DESCRIPTION("UCSI I2C driver for Cypress CCGx Type-C controller"); +MODULE_LICENSE("GPL v2");