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 <carlpeng...@gmail.com>
---
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
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 2ac87fa..974700c 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -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
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 49bf07e..ce86081 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -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
diff --git a/drivers/i2c/busses/i2c-designware-acpidrv.c
b/drivers/i2c/busses/i2c-designware-acpidrv.c
new file mode 100644
index 0000000..ebe3a51
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware-acpidrv.c
@@ -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 <carlpeng...@gmail.com>");
+MODULE_DESCRIPTION("Synopsys DesignWare ACPI I2C bus adapter");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-designware-core.h
b/drivers/i2c/busses/i2c-designware-core.h
index d66b6cb..b88dbb8 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -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;
--
1.9.1
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