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