https://github.com/torvalds/linux
Tip revision: 5ae90d8e467e625e447000cb4335c4db973b1095 authored by Linus Torvalds on 29 July 2013, 03:53:33 UTC
Linux 3.11-rc3
Linux 3.11-rc3
Tip revision: 5ae90d8
platform.c
/*
* Platform driver for the Synopsys DesignWare DMA Controller
*
* Copyright (C) 2007-2008 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
* Copyright (C) 2013 Intel Corporation
*
* Some parts of this driver are derived from the original dw_dmac.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include "internal.h"
struct dw_dma_of_filter_args {
struct dw_dma *dw;
unsigned int req;
unsigned int src;
unsigned int dst;
};
static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma_of_filter_args *fargs = param;
/* Ensure the device matches our channel */
if (chan->device != &fargs->dw->dma)
return false;
dwc->request_line = fargs->req;
dwc->src_master = fargs->src;
dwc->dst_master = fargs->dst;
return true;
}
static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dw_dma *dw = ofdma->of_dma_data;
struct dw_dma_of_filter_args fargs = {
.dw = dw,
};
dma_cap_mask_t cap;
if (dma_spec->args_count != 3)
return NULL;
fargs.req = dma_spec->args[0];
fargs.src = dma_spec->args[1];
fargs.dst = dma_spec->args[2];
if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
fargs.src >= dw->nr_masters ||
fargs.dst >= dw->nr_masters))
return NULL;
dma_cap_zero(cap);
dma_cap_set(DMA_SLAVE, cap);
/* TODO: there should be a simpler way to do this */
return dma_request_channel(cap, dw_dma_of_filter, &fargs);
}
#ifdef CONFIG_ACPI
static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct acpi_dma_spec *dma_spec = param;
if (chan->device->dev != dma_spec->dev ||
chan->chan_id != dma_spec->chan_id)
return false;
dwc->request_line = dma_spec->slave_id;
dwc->src_master = dwc_get_sms(NULL);
dwc->dst_master = dwc_get_dms(NULL);
return true;
}
static void dw_dma_acpi_controller_register(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
struct acpi_dma_filter_info *info;
int ret;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return;
dma_cap_zero(info->dma_cap);
dma_cap_set(DMA_SLAVE, info->dma_cap);
info->filter_fn = dw_dma_acpi_filter;
ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
info);
if (ret)
dev_err(dev, "could not register acpi_dma_controller\n");
}
#else /* !CONFIG_ACPI */
static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
#endif /* !CONFIG_ACPI */
#ifdef CONFIG_OF
static struct dw_dma_platform_data *
dw_dma_parse_dt(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct dw_dma_platform_data *pdata;
u32 tmp, arr[4];
if (!np) {
dev_err(&pdev->dev, "Missing DT data\n");
return NULL;
}
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
return NULL;
if (of_property_read_bool(np, "is_private"))
pdata->is_private = true;
if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
pdata->chan_allocation_order = (unsigned char)tmp;
if (!of_property_read_u32(np, "chan_priority", &tmp))
pdata->chan_priority = tmp;
if (!of_property_read_u32(np, "block_size", &tmp))
pdata->block_size = tmp;
if (!of_property_read_u32(np, "dma-masters", &tmp)) {
if (tmp > 4)
return NULL;
pdata->nr_masters = tmp;
}
if (!of_property_read_u32_array(np, "data_width", arr,
pdata->nr_masters))
for (tmp = 0; tmp < pdata->nr_masters; tmp++)
pdata->data_width[tmp] = arr[tmp];
return pdata;
}
#else
static inline struct dw_dma_platform_data *
dw_dma_parse_dt(struct platform_device *pdev)
{
return NULL;
}
#endif
static int dw_probe(struct platform_device *pdev)
{
struct dw_dma_chip *chip;
struct device *dev = &pdev->dev;
struct resource *mem;
struct dw_dma_platform_data *pdata;
int err;
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->irq = platform_get_irq(pdev, 0);
if (chip->irq < 0)
return chip->irq;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
chip->regs = devm_ioremap_resource(dev, mem);
if (IS_ERR(chip->regs))
return PTR_ERR(chip->regs);
/* Apply default dma_mask if needed */
if (!dev->dma_mask) {
dev->dma_mask = &dev->coherent_dma_mask;
dev->coherent_dma_mask = DMA_BIT_MASK(32);
}
pdata = dev_get_platdata(dev);
if (!pdata)
pdata = dw_dma_parse_dt(pdev);
chip->dev = dev;
err = dw_dma_probe(chip, pdata);
if (err)
return err;
platform_set_drvdata(pdev, chip);
if (pdev->dev.of_node) {
err = of_dma_controller_register(pdev->dev.of_node,
dw_dma_of_xlate, chip->dw);
if (err)
dev_err(&pdev->dev,
"could not register of_dma_controller\n");
}
if (ACPI_HANDLE(&pdev->dev))
dw_dma_acpi_controller_register(chip->dw);
return 0;
}
static int dw_remove(struct platform_device *pdev)
{
struct dw_dma_chip *chip = platform_get_drvdata(pdev);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
return dw_dma_remove(chip);
}
static void dw_shutdown(struct platform_device *pdev)
{
struct dw_dma_chip *chip = platform_get_drvdata(pdev);
dw_dma_shutdown(chip);
}
#ifdef CONFIG_OF
static const struct of_device_id dw_dma_of_id_table[] = {
{ .compatible = "snps,dma-spear1340" },
{}
};
MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id dw_dma_acpi_id_table[] = {
{ "INTL9C60", 0 },
{ }
};
#endif
#ifdef CONFIG_PM_SLEEP
static int dw_suspend_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_dma_chip *chip = platform_get_drvdata(pdev);
return dw_dma_suspend(chip);
}
static int dw_resume_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_dma_chip *chip = platform_get_drvdata(pdev);
return dw_dma_resume(chip);
}
#else /* !CONFIG_PM_SLEEP */
#define dw_suspend_noirq NULL
#define dw_resume_noirq NULL
#endif /* !CONFIG_PM_SLEEP */
static const struct dev_pm_ops dw_dev_pm_ops = {
.suspend_noirq = dw_suspend_noirq,
.resume_noirq = dw_resume_noirq,
.freeze_noirq = dw_suspend_noirq,
.thaw_noirq = dw_resume_noirq,
.restore_noirq = dw_resume_noirq,
.poweroff_noirq = dw_suspend_noirq,
};
static struct platform_driver dw_driver = {
.probe = dw_probe,
.remove = dw_remove,
.shutdown = dw_shutdown,
.driver = {
.name = "dw_dmac",
.pm = &dw_dev_pm_ops,
.of_match_table = of_match_ptr(dw_dma_of_id_table),
.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
},
};
static int __init dw_init(void)
{
return platform_driver_register(&dw_driver);
}
subsys_initcall(dw_init);
static void __exit dw_exit(void)
{
platform_driver_unregister(&dw_driver);
}
module_exit(dw_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");