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. Reviewed-by: Andy Shevchenko <andriy.shevche...@linux.intel.com> Signed-off-by: Weike Chen <alvin.c...@intel.com> Signed-off-by: Raymond Tan <raymond....@intel.com> --- drivers/mfd/Kconfig | 11 ++ drivers/mfd/Makefile | 1 + drivers/mfd/intel_quark_i2c_gpio.c | 298 ++++++++++++++++++++++++++++++++++++ 3 files changed, 310 insertions(+) create mode 100644 drivers/mfd/intel_quark_i2c_gpio.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b7c74a7..d01d042 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -219,6 +219,17 @@ 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 && 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..eed95da --- /dev/null +++ b/drivers/mfd/intel_quark_i2c_gpio.c @@ -0,0 +1,298 @@ +/* + * 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/mfd/core.h> +#include <linux/clkdev.h> +#include <linux/clk-provider.h> +#include <linux/dmi.h> +#include <linux/platform_data/gpio-dwapb.h> +#include <linux/platform_data/i2c-designware.h> + +/* 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 clk *intel_quark_i2c_clk; +struct clk_lookup *intel_quark_i2c_clk_lookups; + +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), }, + { 0,} +}; +MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids); + +static struct dwapb_platform_data * +intel_quark_prepare_pdata(struct pci_dev *pdev) +{ + struct dwapb_platform_data *pdata; + struct device *dev = &pdev->dev; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-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 ERR_PTR(-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; + + return pdata; +} + +static struct dw_i2c_platform_data * +intel_quark_get_i2c_mode(struct pci_dev *pdev) +{ + const char *board_name = dmi_get_system_info(DMI_BOARD_NAME); + struct dw_i2c_platform_data *pdata; + struct device *dev = &pdev->dev; + unsigned int i; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-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; + + return pdata; +} + +static int intel_quark_register_i2c_clk(struct pci_dev *pdev) +{ + intel_quark_i2c_clk_lookups = devm_kcalloc( + &pdev->dev, INTEL_QUARK_I2C_NCLK, + sizeof(*intel_quark_i2c_clk_lookups), GFP_KERNEL); + + if (!intel_quark_i2c_clk_lookups) + return -ENOMEM; + + intel_quark_i2c_clk_lookups[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK; + + intel_quark_i2c_clk = clk_register_fixed_rate( + &pdev->dev, INTEL_QUARK_I2C_CONTROLLER_CLK, NULL, + CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ); + + return clk_register_clkdevs(intel_quark_i2c_clk, + intel_quark_i2c_clk_lookups, INTEL_QUARK_I2C_NCLK); +} + +static void intel_quark_unregister_i2c_clk(void) +{ + if (!intel_quark_i2c_clk || !intel_quark_i2c_clk_lookups) + return; + + clkdev_drop(intel_quark_i2c_clk_lookups); + clk_unregister(intel_quark_i2c_clk); +} + +static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) +{ + struct dw_i2c_platform_data *pdata; + struct resource *res = (struct resource *)cell->resources; + int retval; + + 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; + + retval = intel_quark_register_i2c_clk(pdev); + if (retval) { + dev_err(&pdev->dev, "Fixed clk register failed: %d\n", retval); + return retval; + } + + pdata = intel_quark_get_i2c_mode(pdev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + + 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; + + 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 = intel_quark_prepare_pdata(pdev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + + cell->platform_data = pdata; + cell->pdata_size = sizeof(*pdata); + + return 0; +} + +struct intel_quark_mfd_dev { + int (*setup)(struct pci_dev *pdev, struct mfd_cell *cell); + struct mfd_cell *cell; +}; + +static struct intel_quark_mfd_dev intel_quark_mfd_devs[] = { + { + .cell = &intel_quark_mfd_cells[MFD_I2C_BAR], + .setup = intel_quark_i2c_setup, + }, + { + .cell = &intel_quark_mfd_cells[MFD_GPIO_BAR], + .setup = intel_quark_gpio_setup, + }, + { + /* terminator */ + }, +}; + +static int intel_quark_mfd_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct intel_quark_mfd_dev *mfd_dev; + int retval; + + retval = pcim_enable_device(pdev); + if (retval) + return retval; + + for (mfd_dev = intel_quark_mfd_devs; mfd_dev->cell; mfd_dev++) + if (mfd_dev->setup) { + retval = mfd_dev->setup(pdev, mfd_dev->cell); + if (retval) + return retval; + } + + 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(); + 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 <raymond....@intel.com>"); +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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/