diff options
Diffstat (limited to 'drivers/mfd/intel_quark_i2c_gpio.c')
| -rw-r--r-- | drivers/mfd/intel_quark_i2c_gpio.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c new file mode 100644 index 000000000..9b9c76bd0 --- /dev/null +++ b/drivers/mfd/intel_quark_i2c_gpio.c @@ -0,0 +1,309 @@ +// 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"); |