Re: [PATCH v3 1/1] mfd: intel_quark_i2c_gpio: Add Intel Quark X1000 I2C-GPIO MFD Driver
From: Shevchenko, Andriy
Date: Thu Dec 11 2014 - 05:27:40 EST
On Thu, 2014-12-11 at 17:38 +0800, Raymond Tan wrote:
> 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.
See my comments below.
>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Weike Chen <alvin.chen@xxxxxxxxx>
> Signed-off-by: Raymond Tan <raymond.tan@xxxxxxxxx>
> ---
> drivers/mfd/Kconfig | 12 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/intel_quark_i2c_gpio.c | 279 ++++++++++++++++++++++++++++++++++++
So, there is a proposal to bring the order into the source tree a bit
for Intel related MFD drivers.
What about to move this module to
drivers/mfd/intel/quark/i2c_gpio.c ?
At least what I can tell now, it will come more Intel stuff and we have
few drivers already there.
I can see the following:
drivers/mfd/intel/
-> quark/
-> mid/ (Intel MID platforms, existing drivers)
-> some new platform/ (whatever is the one of the new Intel SoCs)
Lee, what's your opinion?
I could change a layout for existing in-tree drivers.
> 3 files changed, 292 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
Depending on the further discussion about layout.
> + 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..a3a7043
> --- /dev/null
> +++ b/drivers/mfd/intel_quark_i2c_gpio.c
> @@ -0,0 +1,279 @@
> +/*
> + * 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 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), },
> + { 0,}
> +};
> +MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
> +
> +static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd)
What about quark_mfd -> mfd ? This prefix is kinda useless inside the
functions in this module.
> +{
> + struct pci_dev *pdev = quark_mfd->pdev;
> + struct clk_lookup *i2c_clk_lookup;
> + struct clk *i2c_clk;
> + int retval;
> +
> + 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;
> +
> + retval = clk_register_clkdevs(i2c_clk, i2c_clk_lookup,
> + INTEL_QUARK_I2C_NCLK);
> + if (retval)
> + dev_err(&pdev->dev, "Fixed clk register failed: %d\n", retval);
> +
> + return retval;
> +}
> +
> +static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
> +{
> + struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);
Ditto.
> +
> + 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;
Here you know what the exact resource you is going to change.
What if you update the global variable first, and assign it here to the
cell?
> + 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;
Same idea here.
> + 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 retval;
> +
> + retval = pcim_enable_device(pdev);
> + if (retval)
> + return retval;
> +
> + quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
> + if (!quark_mfd)
> + return -ENOMEM;
> + quark_mfd->pdev = pdev;
> +
> + retval = intel_quark_register_i2c_clk(quark_mfd);
> + if (retval)
> + return retval;
> +
> + dev_set_drvdata(&pdev->dev, quark_mfd);
> +
> + retval = intel_quark_i2c_setup(pdev,
> + &intel_quark_mfd_cells[MFD_I2C_BAR]);
> + if (retval)
> + return retval;
> +
> + retval = intel_quark_gpio_setup(pdev,
> + &intel_quark_mfd_cells[MFD_GPIO_BAR]);
> + 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(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 <raymond.tan@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
> +MODULE_LICENSE("GPL v2");
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
Intel Finland Oy
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