i2c-designware: Add support for ACPI i2c device

AMD platform i2c bus controllers are ACPI devices, this patch is to add a ACPI glue for Designware core, make it support i2c bus controller with ACPI interface.

Signed-off-by Carl Peng <[email protected]>

---
 drivers/i2c/busses/Kconfig                  |  12 +
 drivers/i2c/busses/Makefile                 |   1 +
 drivers/i2c/busses/i2c-designware-acpidrv.c | 355 ++++++++++++++++++++++++++++
 drivers/i2c/busses/i2c-designware-core.h    |   4 +
 4 files changed, 372 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-designware-acpidrv.c

drivers/i2c/busses/Kconfig +12 -0

index 2ac87fa..974700c 100644
@@ -441,6 +441,18 @@ config I2C_DESIGNWARE_PCI
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-designware-pci.
 
+config I2C_DESIGNWARE_ACPI
+	tristate "Synopsys DesignWare ACPI"
+	depends on ACPI
+	select I2C_DESIGNWARE_CORE
+	help
+	  AMD platform i2c bus controller is ACPI device, this driver is
+	  to add ACPI glue for designware core, make it support ACPI
+	  interface.
+
+	  If you say yes to this option, support will be included for the
+	  Synopsys DesignWare I2C adapter. Only master mode is supported.
+
 config I2C_EFM32
 	tristate "EFM32 I2C controller"
 	depends on ARCH_EFM32 || COMPILE_TEST

drivers/i2c/busses/Makefile +1 -0

index 49bf07e..ce86081 100644
@@ -42,6 +42,7 @@ obj-$(CONFIG_I2C_DESIGNWARE_PLATFORM)	+= i2c-designware-platform.o
 i2c-designware-platform-objs := i2c-designware-platdrv.o
 obj-$(CONFIG_I2C_DESIGNWARE_PCI)	+= i2c-designware-pci.o
 i2c-designware-pci-objs := i2c-designware-pcidrv.o
+obj-$(CONFIG_I2C_DESIGNWARE_ACPI)	+= i2c-designware-acpidrv.o
 obj-$(CONFIG_I2C_EFM32)		+= i2c-efm32.o
 obj-$(CONFIG_I2C_EG20T)		+= i2c-eg20t.o
 obj-$(CONFIG_I2C_EXYNOS5)	+= i2c-exynos5.o

drivers/i2c/busses/i2c-designware-acpidrv.c new file +355 -0

new file mode 100644
index 0000000..ebe3a51
@@ -0,0 +1,355 @@
+/*
+ * Synopsys DesignWare I2C adapter driver (master only).
+ *
+ * Based on the TI DAVINCI I2C adapter driver.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2007 MontaVista Software Inc.
+ * Copyright (C) 2009 Provigent Ltd.
+ * Copyright (C) 2011 Intel corporation.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/acpi.h>
+
+#include "i2c-designware-core.h"
+
+#define CLK_KHZ	(133 * 1024)
+#define TX_FIFO_DEPTH	128
+#define RX_FIFO_DEPTH	128
+
+#define DRIVER_NAME	"i2c-designware-acpi"
+
+#define INTEL_MID_STD_CFG	(DW_IC_CON_MASTER |			\
+				DW_IC_CON_SLAVE_DISABLE |	\
+				DW_IC_CON_RESTART_EN)
+
+enum dw_acpi_ctl_id_t {
+	I2C_BUS_A = 0,
+	I2C_BUS_B,
+	I2C_BUS_C,
+	I2C_BUS_D,
+};
+
+struct dw_acpi_controller {
+	u32 bus_num;
+	u32 bus_cfg;
+	u32 tx_fifo_depth;
+	u32 rx_fifo_depth;
+	u32 clk_khz;
+};
+
+/*i2c controller parameter*/
+static struct  dw_acpi_controller  dw_acpi_controllers[] = {
+	[I2C_BUS_A] = {
+		.bus_num     = 1,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_B] = {
+		.bus_num     = 2,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_C] = {
+		.bus_num     = 3,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_D] = {
+		.bus_num     = 4,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+};
+
+static struct i2c_algorithm i2c_dw_algo = {
+	.master_xfer	= i2c_dw_xfer,
+	.functionality	= i2c_dw_func,
+};
+
+static int i2c_dw_acpi_suspend(struct device *dev)
+{
+	struct dw_i2c_dev *i2c = acpi_driver_data(to_acpi_device(dev));
+
+	i2c_dw_disable(i2c);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_resume(struct device *dev)
+{
+	struct dw_i2c_dev *i2c = acpi_driver_data(to_acpi_device(dev));
+	u32 enabled;
+
+	enabled = i2c_dw_is_enabled(i2c);
+	if (enabled)
+		return 0;
+
+	i2c_dw_init(i2c);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_runtime_idle(struct device *dev)
+{
+	int err = pm_schedule_suspend(dev, 500);
+
+	dev_dbg(dev, "runtime_idle called\n");
+
+	if (err != 0)
+		return 0;
+
+	return -EBUSY;
+}
+
+static int get_irq_flag(int trigger, int polarity, int share)
+{
+	int flags;
+
+	if (trigger == ACPI_LEVEL_SENSITIVE)
+		flags = (polarity == ACPI_ACTIVE_LOW) ? IRQF_TRIGGER_LOW
+							: IRQF_TRIGGER_HIGH;
+	else
+		flags = (polarity == ACPI_ACTIVE_LOW) ? IRQF_TRIGGER_FALLING
+							: IRQF_TRIGGER_RISING;
+
+	if (share == ACPI_SHARED)
+		flags |= IRQF_SHARED;
+
+	return flags;
+}
+
+static acpi_status
+acpi_i2c_parse_resource(struct acpi_resource *res, void *context)
+{
+	int ret;
+	struct dw_i2c_dev *dev = context;
+	struct acpi_resource_fixed_memory32 *fixmem32;
+
+	switch (res->type) {
+	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+		fixmem32 = &res->data.fixed_memory32;
+		if (!fixmem32)
+			return AE_NO_MEMORY;
+
+		dev->io_base = fixmem32->address;
+		dev->io_length = fixmem32->address_length;
+		ret = AE_OK;
+		break;
+
+	case ACPI_RESOURCE_TYPE_IRQ:
+		dev->irq = res->data.irq.interrupts[0];
+		dev->irq_flag = get_irq_flag(res->data.irq.triggering,
+			res->data.irq.polarity, res->data.irq.sharable);
+		ret = AE_OK;
+		break;
+
+	default:
+		if (dev->io_base && dev->irq)
+			ret = AE_OK;
+		else
+			ret = AE_NOT_FOUND;
+		break;
+	}
+
+	return ret;
+}
+
+static const struct dev_pm_ops i2c_dw_pm_ops = {
+	.resume         = i2c_dw_acpi_resume,
+	.suspend        = i2c_dw_acpi_suspend,
+	SET_RUNTIME_PM_OPS(i2c_dw_acpi_suspend, i2c_dw_acpi_resume,
+			   i2c_dw_acpi_runtime_idle)
+};
+
+static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+	return dev->acpi_controller->clk_khz;
+}
+
+static u32 i2c_get_uid(struct acpi_device *dev)
+{
+	return kstrtoul(dev->pnp.unique_id, 10, NULL);
+}
+
+static int i2c_dw_acpi_add(struct acpi_device *pdev)
+{
+	int r;
+	acpi_status status;
+	struct dw_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct dw_acpi_controller *controller;
+	u32 controller_id;
+
+	controller_id = i2c_get_uid(pdev);
+
+	if (controller_id >= ARRAY_SIZE(dw_acpi_controllers)) {
+		dev_err(&pdev->dev, "invalid controller number %d\n",
+			controller_id);
+		return  -EINVAL;
+	}
+
+	controller = &dw_acpi_controllers[controller_id];
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+	if (!dev)
+		return  -ENOMEM;
+
+	status = acpi_walk_resources(pdev->handle, METHOD_NAME__CRS,
+				     acpi_i2c_parse_resource, dev);
+	if (ACPI_FAILURE(status) || !dev->io_base || !dev->irq) {
+		dev_err(&pdev->dev, "failure getting resource\n");
+		return -ENODEV;
+	}
+
+	init_completion(&dev->cmd_complete);
+	mutex_init(&dev->lock);
+	dev->clk = NULL;
+	dev->acpi_controller = controller;
+	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+	dev->base = devm_ioremap(&pdev->dev, dev->io_base, dev->io_length);
+	if (dev->base == NULL) {
+		dev_err(&pdev->dev, "failure mapping I/O memory\n");
+		return -EBUSY;
+	}
+	dev->dev = &pdev->dev;
+	dev->functionality =
+		I2C_FUNC_I2C |
+		I2C_FUNC_SMBUS_BYTE |
+		I2C_FUNC_SMBUS_BYTE_DATA |
+		I2C_FUNC_SMBUS_WORD_DATA |
+		I2C_FUNC_SMBUS_I2C_BLOCK;
+	dev->master_cfg =  controller->bus_cfg;
+
+	pdev->driver_data = dev;
+
+	dev->tx_fifo_depth = controller->tx_fifo_depth;
+	dev->rx_fifo_depth = controller->rx_fifo_depth;
+
+	r = i2c_dw_init(dev);
+	if (r) {
+		dev_err(&pdev->dev, "failure initiating i2c controller\n");
+		return -EINVAL;
+	}
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON;
+	adap->algo = &i2c_dw_algo;
+	adap->dev.parent = &pdev->dev;
+	ACPI_COMPANION_SET(adap->dev.parent, pdev);
+	adap->nr = controller->bus_num;
+	snprintf(adap->name, sizeof(adap->name), "i2c-designware-acpi-%d",
+		 adap->nr);
+
+	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, dev->irq_flag,
+			     adap->name, dev);
+	if (r) {
+		dev_err(&pdev->dev, "failure requesting irq %d\n", dev->irq);
+		return r;
+	}
+
+	i2c_dw_disable_int(dev);
+	i2c_dw_clear_int(dev);
+
+	r = i2c_add_numbered_adapter(adap);
+	if (r) {
+		dev_err(&pdev->dev, "failure adding adapter\n");
+		return r;
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_allow(&pdev->dev);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_remove(struct acpi_device *pdev)
+{
+	struct dw_i2c_dev *dev = acpi_driver_data(pdev);
+
+	i2c_dw_disable(dev);
+	pm_runtime_forbid(&pdev->dev);
+	pm_runtime_get_noresume(&pdev->dev);
+
+	i2c_del_adapter(&dev->adapter);
+
+	return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("i2c_designware-acpi");
+
+static const struct acpi_device_id i2_designware_acpi_ids[] = {
+	{ "IFC0000", 0},
+	{ "AMD0010", 0},
+	{ "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, i2_designware_acpi_ids);
+
+static struct acpi_driver dw_i2c_driver = {
+	.name =         DRIVER_NAME,
+	.class =        DRIVER_NAME,
+	.ids =          i2_designware_acpi_ids,
+	.ops =          {
+				.add =  i2c_dw_acpi_add,
+				.remove = i2c_dw_acpi_remove,
+			},
+	.drv.pm = &i2c_dw_pm_ops,
+};
+
+static int __init dw_i2c_module_init(void)
+{
+	int ret;
+
+	ret = acpi_bus_register_driver(&dw_i2c_driver);
+
+	return ret;
+}
+module_init(dw_i2c_module_init);
+
+static void __exit dw_i2c_module_exit(void)
+{
+	acpi_bus_unregister_driver(&dw_i2c_driver);
+}
+module_exit(dw_i2c_module_exit);
+
+MODULE_AUTHOR("Carl Peng <[email protected]>");
+MODULE_DESCRIPTION("Synopsys DesignWare ACPI I2C bus adapter");
+MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-designware-core.h +4 -0

index d66b6cb..b88dbb8 100644
@@ -73,11 +73,14 @@
 struct dw_i2c_dev {
 	struct device		*dev;
 	void __iomem		*base;
+	resource_size_t		io_base;
+	u32			io_length;
 	struct completion	cmd_complete;
 	struct mutex		lock;
 	struct clk		*clk;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
 	struct dw_pci_controller *controller;
+	struct dw_acpi_controller *acpi_controller;
 	int			cmd_err;
 	struct i2c_msg		*msgs;
 	int			msgs_num;

@@ -91,6 +94,7 @@ struct dw_i2c_dev {
 	unsigned int		status;
 	u32			abort_source;
 	int			irq;
+	unsigned int		irq_flag;
 	u32			accessor_flags;
 	struct i2c_adapter	adapter;
 	u32			functionality;

Signature · 6 lines

1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Quoted 6 lines · Carl Peng

AMD platform i2c bus controllers are ACPI devices, this patch is to add a ACPI glue for Designware core, make it support i2c bus controller with ACPI interface.

Signed-off-by Carl Peng <[email protected]>

i2c-designware-platdrv.c has ACPI support, can't you reuse that? CCing Mika for ACPI expertise...

Quoted 439 lines

---
 drivers/i2c/busses/Kconfig                  |  12 +
 drivers/i2c/busses/Makefile                 |   1 +
 drivers/i2c/busses/i2c-designware-acpidrv.c | 355 ++++++++++++++++++++++++++++
 drivers/i2c/busses/i2c-designware-core.h    |   4 +
 4 files changed, 372 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-designware-acpidrv.c

drivers/i2c/busses/Kconfig +12 -0

index 2ac87fa..974700c 100644
@@ -441,6 +441,18 @@ config I2C_DESIGNWARE_PCI
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-designware-pci.
 
+config I2C_DESIGNWARE_ACPI
+	tristate "Synopsys DesignWare ACPI"
+	depends on ACPI
+	select I2C_DESIGNWARE_CORE
+	help
+	  AMD platform i2c bus controller is ACPI device, this driver is
+	  to add ACPI glue for designware core, make it support ACPI
+	  interface.
+
+	  If you say yes to this option, support will be included for the
+	  Synopsys DesignWare I2C adapter. Only master mode is supported.
+
 config I2C_EFM32
 	tristate "EFM32 I2C controller"
 	depends on ARCH_EFM32 || COMPILE_TEST

drivers/i2c/busses/Makefile +1 -0

index 49bf07e..ce86081 100644
@@ -42,6 +42,7 @@ obj-$(CONFIG_I2C_DESIGNWARE_PLATFORM)	+= i2c-designware-platform.o
 i2c-designware-platform-objs := i2c-designware-platdrv.o
 obj-$(CONFIG_I2C_DESIGNWARE_PCI)	+= i2c-designware-pci.o
 i2c-designware-pci-objs := i2c-designware-pcidrv.o
+obj-$(CONFIG_I2C_DESIGNWARE_ACPI)	+= i2c-designware-acpidrv.o
 obj-$(CONFIG_I2C_EFM32)		+= i2c-efm32.o
 obj-$(CONFIG_I2C_EG20T)		+= i2c-eg20t.o
 obj-$(CONFIG_I2C_EXYNOS5)	+= i2c-exynos5.o

drivers/i2c/busses/i2c-designware-acpidrv.c new file +355 -0

new file mode 100644
index 0000000..ebe3a51
@@ -0,0 +1,355 @@
+/*
+ * Synopsys DesignWare I2C adapter driver (master only).
+ *
+ * Based on the TI DAVINCI I2C adapter driver.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2007 MontaVista Software Inc.
+ * Copyright (C) 2009 Provigent Ltd.
+ * Copyright (C) 2011 Intel corporation.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * ----------------------------------------------------------------------------
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/acpi.h>
+
+#include "i2c-designware-core.h"
+
+#define CLK_KHZ	(133 * 1024)
+#define TX_FIFO_DEPTH	128
+#define RX_FIFO_DEPTH	128
+
+#define DRIVER_NAME	"i2c-designware-acpi"
+
+#define INTEL_MID_STD_CFG	(DW_IC_CON_MASTER |			\
+				DW_IC_CON_SLAVE_DISABLE |	\
+				DW_IC_CON_RESTART_EN)
+
+enum dw_acpi_ctl_id_t {
+	I2C_BUS_A = 0,
+	I2C_BUS_B,
+	I2C_BUS_C,
+	I2C_BUS_D,
+};
+
+struct dw_acpi_controller {
+	u32 bus_num;
+	u32 bus_cfg;
+	u32 tx_fifo_depth;
+	u32 rx_fifo_depth;
+	u32 clk_khz;
+};
+
+/*i2c controller parameter*/
+static struct  dw_acpi_controller  dw_acpi_controllers[] = {
+	[I2C_BUS_A] = {
+		.bus_num     = 1,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_B] = {
+		.bus_num     = 2,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_C] = {
+		.bus_num     = 3,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+	[I2C_BUS_D] = {
+		.bus_num     = 4,
+		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+		.tx_fifo_depth = TX_FIFO_DEPTH,
+		.rx_fifo_depth = RX_FIFO_DEPTH,
+		.clk_khz      =  CLK_KHZ,
+	},
+};
+
+static struct i2c_algorithm i2c_dw_algo = {
+	.master_xfer	= i2c_dw_xfer,
+	.functionality	= i2c_dw_func,
+};
+
+static int i2c_dw_acpi_suspend(struct device *dev)
+{
+	struct dw_i2c_dev *i2c = acpi_driver_data(to_acpi_device(dev));
+
+	i2c_dw_disable(i2c);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_resume(struct device *dev)
+{
+	struct dw_i2c_dev *i2c = acpi_driver_data(to_acpi_device(dev));
+	u32 enabled;
+
+	enabled = i2c_dw_is_enabled(i2c);
+	if (enabled)
+		return 0;
+
+	i2c_dw_init(i2c);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_runtime_idle(struct device *dev)
+{
+	int err = pm_schedule_suspend(dev, 500);
+
+	dev_dbg(dev, "runtime_idle called\n");
+
+	if (err != 0)
+		return 0;
+
+	return -EBUSY;
+}
+
+static int get_irq_flag(int trigger, int polarity, int share)
+{
+	int flags;
+
+	if (trigger == ACPI_LEVEL_SENSITIVE)
+		flags = (polarity == ACPI_ACTIVE_LOW) ? IRQF_TRIGGER_LOW
+							: IRQF_TRIGGER_HIGH;
+	else
+		flags = (polarity == ACPI_ACTIVE_LOW) ? IRQF_TRIGGER_FALLING
+							: IRQF_TRIGGER_RISING;
+
+	if (share == ACPI_SHARED)
+		flags |= IRQF_SHARED;
+
+	return flags;
+}
+
+static acpi_status
+acpi_i2c_parse_resource(struct acpi_resource *res, void *context)
+{
+	int ret;
+	struct dw_i2c_dev *dev = context;
+	struct acpi_resource_fixed_memory32 *fixmem32;
+
+	switch (res->type) {
+	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+		fixmem32 = &res->data.fixed_memory32;
+		if (!fixmem32)
+			return AE_NO_MEMORY;
+
+		dev->io_base = fixmem32->address;
+		dev->io_length = fixmem32->address_length;
+		ret = AE_OK;
+		break;
+
+	case ACPI_RESOURCE_TYPE_IRQ:
+		dev->irq = res->data.irq.interrupts[0];
+		dev->irq_flag = get_irq_flag(res->data.irq.triggering,
+			res->data.irq.polarity, res->data.irq.sharable);
+		ret = AE_OK;
+		break;
+
+	default:
+		if (dev->io_base && dev->irq)
+			ret = AE_OK;
+		else
+			ret = AE_NOT_FOUND;
+		break;
+	}
+
+	return ret;
+}
+
+static const struct dev_pm_ops i2c_dw_pm_ops = {
+	.resume         = i2c_dw_acpi_resume,
+	.suspend        = i2c_dw_acpi_suspend,
+	SET_RUNTIME_PM_OPS(i2c_dw_acpi_suspend, i2c_dw_acpi_resume,
+			   i2c_dw_acpi_runtime_idle)
+};
+
+static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+	return dev->acpi_controller->clk_khz;
+}
+
+static u32 i2c_get_uid(struct acpi_device *dev)
+{
+	return kstrtoul(dev->pnp.unique_id, 10, NULL);
+}
+
+static int i2c_dw_acpi_add(struct acpi_device *pdev)
+{
+	int r;
+	acpi_status status;
+	struct dw_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct dw_acpi_controller *controller;
+	u32 controller_id;
+
+	controller_id = i2c_get_uid(pdev);
+
+	if (controller_id >= ARRAY_SIZE(dw_acpi_controllers)) {
+		dev_err(&pdev->dev, "invalid controller number %d\n",
+			controller_id);
+		return  -EINVAL;
+	}
+
+	controller = &dw_acpi_controllers[controller_id];
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+	if (!dev)
+		return  -ENOMEM;
+
+	status = acpi_walk_resources(pdev->handle, METHOD_NAME__CRS,
+				     acpi_i2c_parse_resource, dev);
+	if (ACPI_FAILURE(status) || !dev->io_base || !dev->irq) {
+		dev_err(&pdev->dev, "failure getting resource\n");
+		return -ENODEV;
+	}
+
+	init_completion(&dev->cmd_complete);
+	mutex_init(&dev->lock);
+	dev->clk = NULL;
+	dev->acpi_controller = controller;
+	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+	dev->base = devm_ioremap(&pdev->dev, dev->io_base, dev->io_length);
+	if (dev->base == NULL) {
+		dev_err(&pdev->dev, "failure mapping I/O memory\n");
+		return -EBUSY;
+	}
+	dev->dev = &pdev->dev;
+	dev->functionality =
+		I2C_FUNC_I2C |
+		I2C_FUNC_SMBUS_BYTE |
+		I2C_FUNC_SMBUS_BYTE_DATA |
+		I2C_FUNC_SMBUS_WORD_DATA |
+		I2C_FUNC_SMBUS_I2C_BLOCK;
+	dev->master_cfg =  controller->bus_cfg;
+
+	pdev->driver_data = dev;
+
+	dev->tx_fifo_depth = controller->tx_fifo_depth;
+	dev->rx_fifo_depth = controller->rx_fifo_depth;
+
+	r = i2c_dw_init(dev);
+	if (r) {
+		dev_err(&pdev->dev, "failure initiating i2c controller\n");
+		return -EINVAL;
+	}
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON;
+	adap->algo = &i2c_dw_algo;
+	adap->dev.parent = &pdev->dev;
+	ACPI_COMPANION_SET(adap->dev.parent, pdev);
+	adap->nr = controller->bus_num;
+	snprintf(adap->name, sizeof(adap->name), "i2c-designware-acpi-%d",
+		 adap->nr);
+
+	r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, dev->irq_flag,
+			     adap->name, dev);
+	if (r) {
+		dev_err(&pdev->dev, "failure requesting irq %d\n", dev->irq);
+		return r;
+	}
+
+	i2c_dw_disable_int(dev);
+	i2c_dw_clear_int(dev);
+
+	r = i2c_add_numbered_adapter(adap);
+	if (r) {
+		dev_err(&pdev->dev, "failure adding adapter\n");
+		return r;
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_allow(&pdev->dev);
+
+	return 0;
+}
+
+static int i2c_dw_acpi_remove(struct acpi_device *pdev)
+{
+	struct dw_i2c_dev *dev = acpi_driver_data(pdev);
+
+	i2c_dw_disable(dev);
+	pm_runtime_forbid(&pdev->dev);
+	pm_runtime_get_noresume(&pdev->dev);
+
+	i2c_del_adapter(&dev->adapter);
+
+	return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("i2c_designware-acpi");
+
+static const struct acpi_device_id i2_designware_acpi_ids[] = {
+	{ "IFC0000", 0},
+	{ "AMD0010", 0},
+	{ "", 0},
+};
+MODULE_DEVICE_TABLE(acpi, i2_designware_acpi_ids);
+
+static struct acpi_driver dw_i2c_driver = {
+	.name =         DRIVER_NAME,
+	.class =        DRIVER_NAME,
+	.ids =          i2_designware_acpi_ids,
+	.ops =          {
+				.add =  i2c_dw_acpi_add,
+				.remove = i2c_dw_acpi_remove,
+			},
+	.drv.pm = &i2c_dw_pm_ops,
+};
+
+static int __init dw_i2c_module_init(void)
+{
+	int ret;
+
+	ret = acpi_bus_register_driver(&dw_i2c_driver);
+
+	return ret;
+}
+module_init(dw_i2c_module_init);
+
+static void __exit dw_i2c_module_exit(void)
+{
+	acpi_bus_unregister_driver(&dw_i2c_driver);
+}
+module_exit(dw_i2c_module_exit);
+
+MODULE_AUTHOR("Carl Peng <[email protected]>");
+MODULE_DESCRIPTION("Synopsys DesignWare ACPI I2C bus adapter");
+MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-designware-core.h +4 -0

index d66b6cb..b88dbb8 100644
@@ -73,11 +73,14 @@
 struct dw_i2c_dev {
 	struct device		*dev;
 	void __iomem		*base;
+	resource_size_t		io_base;
+	u32			io_length;
 	struct completion	cmd_complete;
 	struct mutex		lock;
 	struct clk		*clk;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
 	struct dw_pci_controller *controller;
+	struct dw_acpi_controller *acpi_controller;
 	int			cmd_err;
 	struct i2c_msg		*msgs;
 	int			msgs_num;

@@ -91,6 +94,7 @@ struct dw_i2c_dev {
 	unsigned int		status;
 	u32			abort_source;
 	int			irq;
+	unsigned int		irq_flag;
 	u32			accessor_flags;
 	struct i2c_adapter	adapter;
 	u32			functionality;

Signature · 6 lines

1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html