linux/drivers/i2c/busses/i2c-designware-pcidrv.c

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/*
* 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 <linux/pm_runtime.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,
};
i2c-designware: Fix PCI core warning on suspend/resume PCI core warns if the legacy PM and new PM functions are present. Update the driver to only use the new power management framework. This patch fixes the following warning seen during suspend/resume: <7>[ 24.193850] i2c-designware-pci 0000:08:13.0: suspend <4>[ 24.193866] ------------[ cut here ]------------ <4>[ 24.193892] WARNING: at drivers/pci/pci-driver.c:605 pci_has_legacy_pm_support+0x48/0x4d() <4>[ 24.193925] Hardware name: OakTrail <4>[ 24.193936] Modules linked in: <4>[ 24.193958] Pid: 2834, comm: kworker/u:22 Tainted: G W 2.6.36greenridge-01402-gc8047e6 #171 <4>[ 24.193974] Call Trace: <4>[ 24.193999] [<c1033a93>] warn_slowpath_common+0x66/0xc2 <4>[ 24.194025] [<c1164143>] ? pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194052] [<c1033afe>] warn_slowpath_null+0xf/0x13 <4>[ 24.194079] [<c1164143>] pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194106] [<c11643ff>] pci_pm_suspend+0x22/0x154 <4>[ 24.194131] [<c11643dd>] ? pci_pm_suspend+0x0/0x154 <4>[ 24.194156] [<c11e8a7a>] pm_op+0x3e/0x95 <4>[ 24.194182] [<c11e931d>] __device_suspend+0x12e/0x194 <4>[ 24.194208] [<c11e974d>] ? dpm_drv_timeout+0x0/0x47 <4>[ 24.194237] [<c11e9729>] async_suspend+0x16/0x3a <4>[ 24.194265] [<c104de8e>] async_run_entry_fn+0x97/0x135 <4>[ 24.194291] [<c1043c34>] process_one_work+0x1c9/0x2db Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2011-10-06 20:26:37 +02:00
static int i2c_dw_pci_suspend(struct device *dev)
{
i2c-designware: Fix PCI core warning on suspend/resume PCI core warns if the legacy PM and new PM functions are present. Update the driver to only use the new power management framework. This patch fixes the following warning seen during suspend/resume: <7>[ 24.193850] i2c-designware-pci 0000:08:13.0: suspend <4>[ 24.193866] ------------[ cut here ]------------ <4>[ 24.193892] WARNING: at drivers/pci/pci-driver.c:605 pci_has_legacy_pm_support+0x48/0x4d() <4>[ 24.193925] Hardware name: OakTrail <4>[ 24.193936] Modules linked in: <4>[ 24.193958] Pid: 2834, comm: kworker/u:22 Tainted: G W 2.6.36greenridge-01402-gc8047e6 #171 <4>[ 24.193974] Call Trace: <4>[ 24.193999] [<c1033a93>] warn_slowpath_common+0x66/0xc2 <4>[ 24.194025] [<c1164143>] ? pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194052] [<c1033afe>] warn_slowpath_null+0xf/0x13 <4>[ 24.194079] [<c1164143>] pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194106] [<c11643ff>] pci_pm_suspend+0x22/0x154 <4>[ 24.194131] [<c11643dd>] ? pci_pm_suspend+0x0/0x154 <4>[ 24.194156] [<c11e8a7a>] pm_op+0x3e/0x95 <4>[ 24.194182] [<c11e931d>] __device_suspend+0x12e/0x194 <4>[ 24.194208] [<c11e974d>] ? dpm_drv_timeout+0x0/0x47 <4>[ 24.194237] [<c11e9729>] async_suspend+0x16/0x3a <4>[ 24.194265] [<c104de8e>] async_run_entry_fn+0x97/0x135 <4>[ 24.194291] [<c1043c34>] process_one_work+0x1c9/0x2db Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2011-10-06 20:26:37 +02:00
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
int err;
i2c_dw_disable(i2c);
err = pci_save_state(pdev);
if (err) {
dev_err(&pdev->dev, "pci_save_state failed\n");
return err;
}
err = pci_set_power_state(pdev, PCI_D3hot);
if (err) {
dev_err(&pdev->dev, "pci_set_power_state failed\n");
return err;
}
return 0;
}
i2c-designware: Fix PCI core warning on suspend/resume PCI core warns if the legacy PM and new PM functions are present. Update the driver to only use the new power management framework. This patch fixes the following warning seen during suspend/resume: <7>[ 24.193850] i2c-designware-pci 0000:08:13.0: suspend <4>[ 24.193866] ------------[ cut here ]------------ <4>[ 24.193892] WARNING: at drivers/pci/pci-driver.c:605 pci_has_legacy_pm_support+0x48/0x4d() <4>[ 24.193925] Hardware name: OakTrail <4>[ 24.193936] Modules linked in: <4>[ 24.193958] Pid: 2834, comm: kworker/u:22 Tainted: G W 2.6.36greenridge-01402-gc8047e6 #171 <4>[ 24.193974] Call Trace: <4>[ 24.193999] [<c1033a93>] warn_slowpath_common+0x66/0xc2 <4>[ 24.194025] [<c1164143>] ? pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194052] [<c1033afe>] warn_slowpath_null+0xf/0x13 <4>[ 24.194079] [<c1164143>] pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194106] [<c11643ff>] pci_pm_suspend+0x22/0x154 <4>[ 24.194131] [<c11643dd>] ? pci_pm_suspend+0x0/0x154 <4>[ 24.194156] [<c11e8a7a>] pm_op+0x3e/0x95 <4>[ 24.194182] [<c11e931d>] __device_suspend+0x12e/0x194 <4>[ 24.194208] [<c11e974d>] ? dpm_drv_timeout+0x0/0x47 <4>[ 24.194237] [<c11e9729>] async_suspend+0x16/0x3a <4>[ 24.194265] [<c104de8e>] async_run_entry_fn+0x97/0x135 <4>[ 24.194291] [<c1043c34>] process_one_work+0x1c9/0x2db Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2011-10-06 20:26:37 +02:00
static int i2c_dw_pci_resume(struct device *dev)
{
i2c-designware: Fix PCI core warning on suspend/resume PCI core warns if the legacy PM and new PM functions are present. Update the driver to only use the new power management framework. This patch fixes the following warning seen during suspend/resume: <7>[ 24.193850] i2c-designware-pci 0000:08:13.0: suspend <4>[ 24.193866] ------------[ cut here ]------------ <4>[ 24.193892] WARNING: at drivers/pci/pci-driver.c:605 pci_has_legacy_pm_support+0x48/0x4d() <4>[ 24.193925] Hardware name: OakTrail <4>[ 24.193936] Modules linked in: <4>[ 24.193958] Pid: 2834, comm: kworker/u:22 Tainted: G W 2.6.36greenridge-01402-gc8047e6 #171 <4>[ 24.193974] Call Trace: <4>[ 24.193999] [<c1033a93>] warn_slowpath_common+0x66/0xc2 <4>[ 24.194025] [<c1164143>] ? pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194052] [<c1033afe>] warn_slowpath_null+0xf/0x13 <4>[ 24.194079] [<c1164143>] pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194106] [<c11643ff>] pci_pm_suspend+0x22/0x154 <4>[ 24.194131] [<c11643dd>] ? pci_pm_suspend+0x0/0x154 <4>[ 24.194156] [<c11e8a7a>] pm_op+0x3e/0x95 <4>[ 24.194182] [<c11e931d>] __device_suspend+0x12e/0x194 <4>[ 24.194208] [<c11e974d>] ? dpm_drv_timeout+0x0/0x47 <4>[ 24.194237] [<c11e9729>] async_suspend+0x16/0x3a <4>[ 24.194265] [<c104de8e>] async_run_entry_fn+0x97/0x135 <4>[ 24.194291] [<c1043c34>] process_one_work+0x1c9/0x2db Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2011-10-06 20:26:37 +02:00
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
int err;
u32 enabled;
enabled = i2c_dw_is_enabled(i2c);
if (enabled)
return 0;
err = pci_set_power_state(pdev, PCI_D0);
if (err) {
dev_err(&pdev->dev, "pci_set_power_state() failed\n");
return err;
}
pci_restore_state(pdev);
i2c_dw_init(i2c);
return 0;
}
static int i2c_dw_pci_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 const struct dev_pm_ops i2c_dw_pm_ops = {
i2c-designware: Fix PCI core warning on suspend/resume PCI core warns if the legacy PM and new PM functions are present. Update the driver to only use the new power management framework. This patch fixes the following warning seen during suspend/resume: <7>[ 24.193850] i2c-designware-pci 0000:08:13.0: suspend <4>[ 24.193866] ------------[ cut here ]------------ <4>[ 24.193892] WARNING: at drivers/pci/pci-driver.c:605 pci_has_legacy_pm_support+0x48/0x4d() <4>[ 24.193925] Hardware name: OakTrail <4>[ 24.193936] Modules linked in: <4>[ 24.193958] Pid: 2834, comm: kworker/u:22 Tainted: G W 2.6.36greenridge-01402-gc8047e6 #171 <4>[ 24.193974] Call Trace: <4>[ 24.193999] [<c1033a93>] warn_slowpath_common+0x66/0xc2 <4>[ 24.194025] [<c1164143>] ? pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194052] [<c1033afe>] warn_slowpath_null+0xf/0x13 <4>[ 24.194079] [<c1164143>] pci_has_legacy_pm_support+0x48/0x4d <4>[ 24.194106] [<c11643ff>] pci_pm_suspend+0x22/0x154 <4>[ 24.194131] [<c11643dd>] ? pci_pm_suspend+0x0/0x154 <4>[ 24.194156] [<c11e8a7a>] pm_op+0x3e/0x95 <4>[ 24.194182] [<c11e931d>] __device_suspend+0x12e/0x194 <4>[ 24.194208] [<c11e974d>] ? dpm_drv_timeout+0x0/0x47 <4>[ 24.194237] [<c11e9729>] async_suspend+0x16/0x3a <4>[ 24.194265] [<c104de8e>] async_run_entry_fn+0x97/0x135 <4>[ 24.194291] [<c1043c34>] process_one_work+0x1c9/0x2db Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2011-10-06 20:26:37 +02:00
.resume = i2c_dw_pci_resume,
.suspend = i2c_dw_pci_suspend,
SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
i2c_dw_pci_runtime_idle)
};
static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
return dev->controller->clk_khz;
}
static int i2c_dw_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
int r;
struct dw_pci_controller *controller;
if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
id->driver_data);
return -EINVAL;
}
controller = &dw_pci_controllers[id->driver_data];
r = pcim_enable_device(pdev);
if (r) {
dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
r);
return r;
}
r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
if (r) {
dev_err(&pdev->dev, "I/O memory remapping failed\n");
return r;
}
dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
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 = pcim_iomap_table(pdev)[0];
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;
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)
return r;
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 = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
adap->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\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 void i2c_dw_pci_remove(struct pci_dev *pdev)
{
struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
i2c_dw_disable(dev);
pm_runtime_forbid(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
i2c_del_adapter(&dev->adapter);
}
/* work with hotplug and coldplug */
MODULE_ALIAS("i2c_designware-pci");
static 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 = i2c_dw_pci_remove,
.driver = {
.pm = &i2c_dw_pm_ops,
},
};
module_pci_driver(dw_i2c_driver);
MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
MODULE_LICENSE("GPL");