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");