310 lines
8.0 KiB
C
310 lines
8.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel Quark MFD PCI driver for I2C & GPIO
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*
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* Copyright(c) 2014 Intel Corporation.
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*
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* Intel Quark PCI device for I2C and GPIO controller sharing the same
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* PCI function. This PCI driver will split the 2 devices into their
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* respective drivers.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/mfd/core.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/dmi.h>
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#include <linux/i2c.h>
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#include <linux/property.h>
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/* PCI BAR for register base address */
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#define MFD_I2C_BAR 0
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#define MFD_GPIO_BAR 1
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/* ACPI _ADR value to match the child node */
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#define MFD_ACPI_MATCH_GPIO 0ULL
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#define MFD_ACPI_MATCH_I2C 1ULL
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#define INTEL_QUARK_IORES_MEM 0
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#define INTEL_QUARK_IORES_IRQ 1
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#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
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/* The Quark I2C controller source clock */
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#define INTEL_QUARK_I2C_CLK_HZ 33000000
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struct intel_quark_mfd {
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struct clk *i2c_clk;
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struct clk_lookup *i2c_clk_lookup;
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};
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static const struct property_entry intel_quark_i2c_controller_standard_properties[] = {
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PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_STANDARD_MODE_FREQ),
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{ }
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};
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static const struct software_node intel_quark_i2c_controller_standard_node = {
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.name = "intel-quark-i2c-controller",
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.properties = intel_quark_i2c_controller_standard_properties,
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};
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static const struct property_entry intel_quark_i2c_controller_fast_properties[] = {
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PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_FAST_MODE_FREQ),
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{ }
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};
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static const struct software_node intel_quark_i2c_controller_fast_node = {
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.name = "intel-quark-i2c-controller",
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.properties = intel_quark_i2c_controller_fast_properties,
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};
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static const struct dmi_system_id dmi_platform_info[] = {
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
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},
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.driver_data = (void *)&intel_quark_i2c_controller_standard_node,
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},
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
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},
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.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
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},
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
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},
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.driver_data = (void *)&intel_quark_i2c_controller_fast_node,
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},
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{}
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};
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/* This is used as a place holder and will be modified at run-time */
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static struct resource intel_quark_i2c_res[] = {
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[INTEL_QUARK_IORES_MEM] = {
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.flags = IORESOURCE_MEM,
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},
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[INTEL_QUARK_IORES_IRQ] = {
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
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.adr = MFD_ACPI_MATCH_I2C,
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};
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/* This is used as a place holder and will be modified at run-time */
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static struct resource intel_quark_gpio_res[] = {
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[INTEL_QUARK_IORES_MEM] = {
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.flags = IORESOURCE_MEM,
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},
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[INTEL_QUARK_IORES_IRQ] = {
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
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.adr = MFD_ACPI_MATCH_GPIO,
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};
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static const struct software_node intel_quark_gpio_controller_node = {
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.name = "intel-quark-gpio-controller",
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};
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static const struct property_entry intel_quark_gpio_portA_properties[] = {
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PROPERTY_ENTRY_U32("reg", 0),
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PROPERTY_ENTRY_U32("snps,nr-gpios", 8),
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PROPERTY_ENTRY_U32("gpio-base", 8),
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{ }
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};
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static const struct software_node intel_quark_gpio_portA_node = {
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.name = "portA",
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.parent = &intel_quark_gpio_controller_node,
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.properties = intel_quark_gpio_portA_properties,
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};
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static const struct software_node *intel_quark_gpio_node_group[] = {
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&intel_quark_gpio_controller_node,
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&intel_quark_gpio_portA_node,
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NULL
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};
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static struct mfd_cell intel_quark_mfd_cells[] = {
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[MFD_I2C_BAR] = {
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.id = MFD_I2C_BAR,
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.name = "i2c_designware",
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.acpi_match = &intel_quark_acpi_match_i2c,
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.num_resources = ARRAY_SIZE(intel_quark_i2c_res),
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.resources = intel_quark_i2c_res,
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.ignore_resource_conflicts = true,
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},
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[MFD_GPIO_BAR] = {
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.id = MFD_GPIO_BAR,
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.name = "gpio-dwapb",
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.acpi_match = &intel_quark_acpi_match_gpio,
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.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
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.resources = intel_quark_gpio_res,
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.ignore_resource_conflicts = true,
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},
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};
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static const struct pci_device_id intel_quark_mfd_ids[] = {
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{ PCI_VDEVICE(INTEL, 0x0934), },
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{},
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};
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MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
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static int intel_quark_register_i2c_clk(struct device *dev)
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{
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struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
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struct clk *i2c_clk;
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i2c_clk = clk_register_fixed_rate(dev,
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INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
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0, INTEL_QUARK_I2C_CLK_HZ);
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if (IS_ERR(i2c_clk))
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return PTR_ERR(i2c_clk);
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quark_mfd->i2c_clk = i2c_clk;
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quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
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INTEL_QUARK_I2C_CONTROLLER_CLK);
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if (!quark_mfd->i2c_clk_lookup) {
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clk_unregister(quark_mfd->i2c_clk);
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dev_err(dev, "Fixed clk register failed\n");
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return -ENOMEM;
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}
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return 0;
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}
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static void intel_quark_unregister_i2c_clk(struct device *dev)
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{
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struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
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if (!quark_mfd->i2c_clk_lookup)
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return;
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clkdev_drop(quark_mfd->i2c_clk_lookup);
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clk_unregister(quark_mfd->i2c_clk);
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}
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static int intel_quark_i2c_setup(struct pci_dev *pdev)
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{
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struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_I2C_BAR];
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struct resource *res = intel_quark_i2c_res;
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const struct dmi_system_id *dmi_id;
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res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_I2C_BAR);
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res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_I2C_BAR);
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res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
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res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);
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/* Normal mode by default */
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cell->swnode = &intel_quark_i2c_controller_standard_node;
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dmi_id = dmi_first_match(dmi_platform_info);
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if (dmi_id)
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cell->swnode = (struct software_node *)dmi_id->driver_data;
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return 0;
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}
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static int intel_quark_gpio_setup(struct pci_dev *pdev)
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{
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struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_GPIO_BAR];
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struct resource *res = intel_quark_gpio_res;
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int ret;
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res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_GPIO_BAR);
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res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_GPIO_BAR);
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res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
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res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);
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ret = software_node_register_node_group(intel_quark_gpio_node_group);
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if (ret)
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return ret;
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cell->swnode = &intel_quark_gpio_controller_node;
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return 0;
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}
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static int intel_quark_mfd_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct intel_quark_mfd *quark_mfd;
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int ret;
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ret = pcim_enable_device(pdev);
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if (ret)
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return ret;
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quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
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if (!quark_mfd)
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return -ENOMEM;
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dev_set_drvdata(&pdev->dev, quark_mfd);
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ret = intel_quark_register_i2c_clk(&pdev->dev);
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if (ret)
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return ret;
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pci_set_master(pdev);
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/* This driver only requires 1 IRQ vector */
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ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
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if (ret < 0)
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goto err_unregister_i2c_clk;
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ret = intel_quark_i2c_setup(pdev);
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if (ret)
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goto err_free_irq_vectors;
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ret = intel_quark_gpio_setup(pdev);
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if (ret)
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goto err_free_irq_vectors;
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ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
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ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
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NULL);
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if (ret)
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goto err_unregister_gpio_node_group;
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return 0;
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err_unregister_gpio_node_group:
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software_node_unregister_node_group(intel_quark_gpio_node_group);
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err_free_irq_vectors:
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pci_free_irq_vectors(pdev);
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err_unregister_i2c_clk:
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intel_quark_unregister_i2c_clk(&pdev->dev);
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return ret;
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}
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static void intel_quark_mfd_remove(struct pci_dev *pdev)
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{
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mfd_remove_devices(&pdev->dev);
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software_node_unregister_node_group(intel_quark_gpio_node_group);
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pci_free_irq_vectors(pdev);
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intel_quark_unregister_i2c_clk(&pdev->dev);
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}
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static struct pci_driver intel_quark_mfd_driver = {
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.name = "intel_quark_mfd_i2c_gpio",
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.id_table = intel_quark_mfd_ids,
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.probe = intel_quark_mfd_probe,
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.remove = intel_quark_mfd_remove,
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};
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module_pci_driver(intel_quark_mfd_driver);
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MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
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MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
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MODULE_LICENSE("GPL v2");
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