Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932610AbbBBC63 (ORCPT ); Sun, 1 Feb 2015 21:58:29 -0500 Received: from mga09.intel.com ([134.134.136.24]:25758 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754644AbbBBC6Z (ORCPT ); Sun, 1 Feb 2015 21:58:25 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.09,504,1418112000"; d="scan'208";a="679472255" From: Raymond Tan To: Lee Jones , Mike Turquette , Samuel Ortiz Cc: linux-kernel@vger.kernel.org, Alvin Chen , Andriy Shevchenko , Raymond Tan Subject: [PATCH v4 1/1] mfd: intel_quark_i2c_gpio: Add Intel Quark X1000 I2C-GPIO MFD Driver Date: Mon, 2 Feb 2015 10:52:51 +0800 Message-Id: <1422845571-7616-2-git-send-email-raymond.tan@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1422845571-7616-1-git-send-email-raymond.tan@intel.com> References: <1422845571-7616-1-git-send-email-raymond.tan@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9990 Lines: 343 In Quark X1000, there's a single PCI device that provides both an I2C controller and a GPIO controller. This MFD driver will split the 2 devices for their respective drivers. This patch is based on Josef Ahmad's initial work for Quark enabling. Acked-by: Michael Turquette Reviewed-by: Andy Shevchenko Signed-off-by: Weike Chen Signed-off-by: Raymond Tan --- drivers/mfd/Kconfig | 12 ++ drivers/mfd/Makefile | 1 + drivers/mfd/intel_quark_i2c_gpio.c | 277 ++++++++++++++++++++++++++++++++++++ 3 files changed, 290 insertions(+) create mode 100644 drivers/mfd/intel_quark_i2c_gpio.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b7c74a7..2f2f62d 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -219,6 +219,18 @@ config HTC_I2CPLD This device provides input and output GPIOs through an I2C interface to one or more sub-chips. +config MFD_INTEL_QUARK_I2C_GPIO + tristate "Intel Quark MFD I2C GPIO" + depends on PCI + depends on X86 + depends on COMMON_CLK + select MFD_CORE + help + This MFD provides support for I2C and GPIO that exist only + in a single PCI device. It splits the 2 IO devices to + their respective IO driver. + The GPIO exports a total amount of 8 interrupt-capable GPIOs. + config LPC_ICH tristate "Intel ICH LPC" depends on PCI diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 8a28dc9..d42652d 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -133,6 +133,7 @@ obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o obj-$(CONFIG_PMIC_ADP5520) += adp5520.o obj-$(CONFIG_MFD_KEMPLD) += kempld-core.o +obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o obj-$(CONFIG_LPC_SCH) += lpc_sch.o obj-$(CONFIG_LPC_ICH) += lpc_ich.o obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c new file mode 100644 index 0000000..006f2a1 --- /dev/null +++ b/drivers/mfd/intel_quark_i2c_gpio.c @@ -0,0 +1,277 @@ +/* + * Intel Quark MFD PCI driver for I2C & GPIO + * + * Copyright(c) 2014 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * Intel Quark PCI device for I2C and GPIO controller sharing the same + * PCI function. This PCI driver will split the 2 devices into their + * respective drivers. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* PCI BAR for register base address */ +#define MFD_I2C_BAR 0 +#define MFD_GPIO_BAR 1 + +/* The base GPIO number under GPIOLIB framework */ +#define INTEL_QUARK_MFD_GPIO_BASE 8 + +/* The default number of South-Cluster GPIO on Quark. */ +#define INTEL_QUARK_MFD_NGPIO 8 + +/* The DesignWare GPIO ports on Quark. */ +#define INTEL_QUARK_GPIO_NPORTS 1 + +#define INTEL_QUARK_IORES_MEM 0 +#define INTEL_QUARK_IORES_IRQ 1 + +#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0" + +/* The Quark I2C controller source clock */ +#define INTEL_QUARK_I2C_CLK_HZ 33000000 + +#define INTEL_QUARK_I2C_NCLK 1 + +struct intel_quark_mfd { + struct pci_dev *pdev; + struct clk *i2c_clk; + struct clk_lookup *i2c_clk_lookup; +}; + +struct i2c_mode_info { + const char *name; + unsigned int i2c_scl_freq; +}; + +static const struct i2c_mode_info platform_i2c_mode_info[] = { + { + .name = "Galileo", + .i2c_scl_freq = 100000, + }, + { + .name = "GalileoGen2", + .i2c_scl_freq = 400000, + }, +}; + +static struct resource intel_quark_i2c_res[] = { + [INTEL_QUARK_IORES_MEM] = { + .flags = IORESOURCE_MEM, + }, + [INTEL_QUARK_IORES_IRQ] = { + .flags = IORESOURCE_IRQ, + }, +}; + +static struct resource intel_quark_gpio_res[] = { + [INTEL_QUARK_IORES_MEM] = { + .flags = IORESOURCE_MEM, + }, +}; + +static struct mfd_cell intel_quark_mfd_cells[] = { + { + .id = MFD_I2C_BAR, + .name = "i2c_designware", + .num_resources = ARRAY_SIZE(intel_quark_i2c_res), + .resources = intel_quark_i2c_res, + .ignore_resource_conflicts = true, + }, + { + .id = MFD_GPIO_BAR, + .name = "gpio-dwapb", + .num_resources = ARRAY_SIZE(intel_quark_gpio_res), + .resources = intel_quark_gpio_res, + .ignore_resource_conflicts = true, + }, +}; + +static const struct pci_device_id intel_quark_mfd_ids[] = { + { PCI_VDEVICE(INTEL, 0x0934), }, + {}, +}; +MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids); + +static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd) +{ + struct pci_dev *pdev = quark_mfd->pdev; + struct clk_lookup *i2c_clk_lookup; + struct clk *i2c_clk; + int ret; + + i2c_clk_lookup = devm_kcalloc(&pdev->dev, INTEL_QUARK_I2C_NCLK, + sizeof(*i2c_clk_lookup), GFP_KERNEL); + if (!i2c_clk_lookup) + return -ENOMEM; + + i2c_clk_lookup[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK; + + i2c_clk = clk_register_fixed_rate(&pdev->dev, + INTEL_QUARK_I2C_CONTROLLER_CLK, NULL, + CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ); + + quark_mfd->i2c_clk_lookup = i2c_clk_lookup; + quark_mfd->i2c_clk = i2c_clk; + + ret = clk_register_clkdevs(i2c_clk, i2c_clk_lookup, + INTEL_QUARK_I2C_NCLK); + if (ret) + dev_err(&pdev->dev, "Fixed clk register failed: %d\n", ret); + + return ret; +} + +static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev) +{ + struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev); + + if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup) + return; + + clkdev_drop(quark_mfd->i2c_clk_lookup); + clk_unregister(quark_mfd->i2c_clk); +} + +static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) +{ + const char *board_name = dmi_get_system_info(DMI_BOARD_NAME); + struct dw_i2c_platform_data *pdata; + struct resource *res = (struct resource *)cell->resources; + struct device *dev = &pdev->dev; + unsigned int i; + + res[INTEL_QUARK_IORES_MEM].start = + pci_resource_start(pdev, MFD_I2C_BAR); + res[INTEL_QUARK_IORES_MEM].end = + pci_resource_end(pdev, MFD_I2C_BAR); + + res[INTEL_QUARK_IORES_IRQ].start = pdev->irq; + res[INTEL_QUARK_IORES_IRQ].end = pdev->irq; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + /* Fast mode by default */ + pdata->i2c_scl_freq = 400000; + + for (i = 0; i < ARRAY_SIZE(platform_i2c_mode_info); i++) + if (!strcmp(board_name, platform_i2c_mode_info[i].name)) + pdata->i2c_scl_freq + = platform_i2c_mode_info[i].i2c_scl_freq; + + cell->platform_data = pdata; + cell->pdata_size = sizeof(*pdata); + + return 0; +} + +static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell) +{ + struct dwapb_platform_data *pdata; + struct resource *res = (struct resource *)cell->resources; + struct device *dev = &pdev->dev; + + res[INTEL_QUARK_IORES_MEM].start = + pci_resource_start(pdev, MFD_GPIO_BAR); + res[INTEL_QUARK_IORES_MEM].end = + pci_resource_end(pdev, MFD_GPIO_BAR); + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + /* For intel quark x1000, it has only one port: portA */ + pdata->nports = INTEL_QUARK_GPIO_NPORTS; + pdata->properties = devm_kcalloc(dev, pdata->nports, + sizeof(*pdata->properties), + GFP_KERNEL); + if (!pdata->properties) + return -ENOMEM; + + /* Set the properties for portA */ + pdata->properties->node = NULL; + pdata->properties->name = "intel-quark-x1000-gpio-portA"; + pdata->properties->idx = 0; + pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO; + pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE; + pdata->properties->irq = pdev->irq; + pdata->properties->irq_shared = true; + + cell->platform_data = pdata; + cell->pdata_size = sizeof(*pdata); + + return 0; +} + +static int intel_quark_mfd_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct intel_quark_mfd *quark_mfd; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL); + if (!quark_mfd) + return -ENOMEM; + quark_mfd->pdev = pdev; + + ret = intel_quark_register_i2c_clk(quark_mfd); + if (ret) + return ret; + + dev_set_drvdata(&pdev->dev, quark_mfd); + + ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[MFD_I2C_BAR]); + if (ret) + return ret; + + ret = intel_quark_gpio_setup(pdev, + &intel_quark_mfd_cells[MFD_GPIO_BAR]); + if (ret) + return ret; + + return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells, + ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0, + NULL); +} + +static void intel_quark_mfd_remove(struct pci_dev *pdev) +{ + intel_quark_unregister_i2c_clk(pdev); + mfd_remove_devices(&pdev->dev); +} + +static struct pci_driver intel_quark_mfd_driver = { + .name = "intel_quark_mfd_i2c_gpio", + .id_table = intel_quark_mfd_ids, + .probe = intel_quark_mfd_probe, + .remove = intel_quark_mfd_remove, +}; + +module_pci_driver(intel_quark_mfd_driver); + +MODULE_AUTHOR("Raymond Tan "); +MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/