[PATCH 11/13] i2c-designware: Add support for Designware core behind PCI devices.

From: dirk . brandewie
Date: Sat Mar 12 2011 - 15:24:10 EST

From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>

Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
---
drivers/i2c/busses/Kconfig | 9 +
drivers/i2c/busses/Makefile | 2 +
drivers/i2c/busses/i2c-designware-core.h | 1 +
drivers/i2c/busses/i2c-designware-pcidrv.c | 316 ++++++++++++++++++++++++++++
4 files changed, 328 insertions(+), 0 deletions(-)
create mode 100644 drivers/i2c/busses/i2c-designware-pcidrv.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 35b5e6b..a815606 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -357,6 +357,15 @@ config I2C_DESIGNWARE_PLATFORM
This driver can also be built as a module. If so, the module
will be called i2c-designware-platform.

+config I2C_DESIGNWARE_PCI
+ tristate "Synopsys DesignWare PCI"
+ help
+ If you say yes to this option, support will be included for the
+ Synopsys DesignWare I2C adapter. Only master mode is supported.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-designware-pci.
+
config I2C_GPIO
tristate "GPIO-based bitbanging I2C"
depends on GENERIC_GPIO
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index effbcc7..42ff6fe 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -35,6 +35,8 @@ obj-$(CONFIG_I2C_CPM) += i2c-cpm.o
obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o
obj-$(CONFIG_I2C_DESIGNWARE_PLATFORM) += i2c-designware-platform.o
i2c-designware-platform-objs := i2c-designware-platdrv.o i2c-designware-core.o
+obj-$(CONFIG_I2C_DESIGNWARE_PCI) += i2c-designware-pci.o
+i2c-designware-pci-objs := i2c-designware-pcidrv.o i2c-designware-core.o
obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 697f12c..6450a6a 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -68,6 +68,7 @@ struct dw_i2c_dev {
struct mutex lock;
struct clk *clk;
u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
+ struct dw_pci_controller *controller;
int cmd_err;
struct i2c_msg *msgs;
int msgs_num;
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
new file mode 100644
index 0000000..83307ef
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -0,0 +1,316 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * ----------------------------------------------------------------------------
+ *
+ */
+
+#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/pci.h>
+#include "i2c-designware-core.h"
+
+#define DRIVER_NAME "i2c-designware-pci"
+
+enum dw_pci_ctl_id_t {
+ moorestown_0,
+ moorestown_1,
+ moorestown_2,
+
+ medfield_0,
+ medfield_1,
+ medfield_2,
+ medfield_3,
+ medfield_4,
+ medfield_5,
+};
+
+struct dw_pci_controller {
+ u32 bus_num;
+ u32 bus_cfg;
+ u32 tx_fifo_depth;
+ u32 rx_fifo_depth;
+ u32 clk_khz;
+};
+
+#define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
+ DW_IC_CON_SLAVE_DISABLE | \
+ DW_IC_CON_RESTART_EN)
+
+static struct dw_pci_controller dw_pci_controllers[] = {
+ [moorestown_0] = {
+ .bus_num = 0,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [moorestown_1] = {
+ .bus_num = 1,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [moorestown_2] = {
+ .bus_num = 2,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_0] = {
+ .bus_num = 0,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_1] = {
+ .bus_num = 1,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_2] = {
+ .bus_num = 2,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_3] = {
+ .bus_num = 3,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_4] = {
+ .bus_num = 4,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+ [medfield_5] = {
+ .bus_num = 5,
+ .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+ .tx_fifo_depth = 32,
+ .rx_fifo_depth = 32,
+ .clk_khz = 25000,
+ },
+};
+static struct i2c_algorithm i2c_dw_algo = {
+ .master_xfer = i2c_dw_xfer,
+ .functionality = i2c_dw_func,
+};
+
+static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+ return dev->controller->clk_khz;
+}
+
+static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
+const struct pci_device_id *id)
+{
+ struct dw_i2c_dev *dev;
+ struct i2c_adapter *adap;
+ unsigned long start, len;
+ void __iomem *base;
+ int r;
+ struct dw_pci_controller *controller;
+
+ if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
+ printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
+ id->driver_data);
+ return -EINVAL;
+ }
+
+ controller = &dw_pci_controllers[id->driver_data];
+
+ r = pci_enable_device(pdev);
+ if (r) {
+ dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
+ r);
+ goto exit;
+ }
+
+ /* Determine the address of the I2C area */
+ start = pci_resource_start(pdev, 0);
+ len = pci_resource_len(pdev, 0);
+ if (!start || len == 0) {
+ dev_err(&pdev->dev, "base address not set\n");
+ r = -ENODEV;
+ goto exit;
+ }
+
+ r = pci_request_region(pdev, 0, DRIVER_NAME);
+ if (r) {
+ dev_err(&pdev->dev, "failed to request I2C region "
+ "0x%lx-0x%lx\n", start,
+ (unsigned long)pci_resource_end(pdev, 0));
+ goto exit;
+ }
+
+ base = ioremap_nocache(start, len);
+ if (!base) {
+ dev_err(&pdev->dev, "I/O memory remapping failed\n");
+ r = -ENOMEM;
+ goto err_release_region;
+ }
+
+
+ dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
+ if (!dev) {
+ r = -ENOMEM;
+ goto err_release_region;
+ }
+
+ init_completion(&dev->cmd_complete);
+ mutex_init(&dev->lock);
+ dev->clk = NULL;
+ dev->controller = controller;
+ dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+ dev->base = base;
+ dev->dev = get_device(&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;
+
+ pci_set_drvdata(pdev, dev);
+
+ dev->tx_fifo_depth = controller->tx_fifo_depth;
+ dev->rx_fifo_depth = controller->rx_fifo_depth;
+ r = i2c_dw_init(dev);
+ if (r)
+ goto err_iounmap;
+
+ adap = &dev->adapter;
+ i2c_set_adapdata(adap, dev);
+ adap->owner = THIS_MODULE;
+ adap->class = 0;
+ adap->algo = &i2c_dw_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->nr = controller->bus_num;
+ snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
+ adap->nr);
+
+ r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
+ if (r) {
+ dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
+ goto err_iounmap;
+ }
+
+ 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");
+ goto err_free_irq;
+ }
+
+ return 0;
+
+err_free_irq:
+ free_irq(pdev->irq, dev);
+err_iounmap:
+ iounmap(dev->base);
+ pci_set_drvdata(pdev, NULL);
+ put_device(&pdev->dev);
+ kfree(dev);
+err_release_region:
+ pci_release_region(pdev, 0);
+exit:
+ return r;
+}
+
+static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
+{
+ struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
+
+ pci_set_drvdata(pdev, NULL);
+ i2c_del_adapter(&dev->adapter);
+ put_device(&pdev->dev);
+
+ free_irq(dev->irq, dev);
+ kfree(dev);
+ pci_release_region(pdev, 0);
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("i2c_designware-pci");
+
+DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
+ /* Moorestown */
+ { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
+ { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
+ { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
+ /* Medfield */
+ { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
+ { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
+ { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
+ { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
+ { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
+ { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
+ { 0,}
+};
+MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
+
+static struct pci_driver dw_i2c_driver = {
+ .name = DRIVER_NAME,
+ .id_table = i2_designware_pci_ids,
+ .probe = i2c_dw_pci_probe,
+ .remove = __devexit_p(i2c_dw_pci_remove),
+};
+
+static int __init dw_i2c_init_driver(void)
+{
+ return pci_register_driver(&dw_i2c_driver);
+}
+module_init(dw_i2c_init_driver);
+
+static void __exit dw_i2c_exit_driver(void)
+{
+ pci_unregister_driver(&dw_i2c_driver);
+}
+module_exit(dw_i2c_exit_driver);
+
+MODULE_AUTHOR("Baruch Siach <baruch@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
+MODULE_LICENSE("GPL");
--
1.7.3.4

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