mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4dfc119f1c
Handle the case where no registered DMACs exist somewhat more gracefully. While we're at it, check for sysdev_create_file() failing. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/*
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* arch/sh/drivers/dma/dma-sysfs.c
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*
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* sysfs interface for SH DMA API
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*
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* Copyright (C) 2004 - 2006 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sysdev.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <asm/dma.h>
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static struct sysdev_class dma_sysclass = {
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set_kset_name("dma"),
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};
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EXPORT_SYMBOL(dma_sysclass);
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static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
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{
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ssize_t len = 0;
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int i;
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for (i = 0; i < MAX_DMA_CHANNELS; i++) {
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struct dma_info *info = get_dma_info(i);
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struct dma_channel *channel = get_dma_channel(i);
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if (unlikely(!info) || !channel)
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continue;
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len += sprintf(buf + len, "%2d: %14s %s\n",
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channel->chan, info->name,
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channel->dev_id);
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}
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return len;
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}
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static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
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static int __init dma_sysclass_init(void)
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{
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int ret;
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ret = sysdev_class_register(&dma_sysclass);
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if (unlikely(ret))
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return ret;
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return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
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}
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postcore_initcall(dma_sysclass_init);
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static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
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{
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struct dma_channel *channel = to_dma_channel(dev);
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return sprintf(buf, "%s\n", channel->dev_id);
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}
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static ssize_t dma_store_dev_id(struct sys_device *dev,
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const char *buf, size_t count)
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{
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struct dma_channel *channel = to_dma_channel(dev);
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strcpy(channel->dev_id, buf);
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return count;
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}
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static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
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static ssize_t dma_store_config(struct sys_device *dev,
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const char *buf, size_t count)
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{
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struct dma_channel *channel = to_dma_channel(dev);
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unsigned long config;
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config = simple_strtoul(buf, NULL, 0);
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dma_configure_channel(channel->vchan, config);
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return count;
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}
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static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
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static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
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{
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struct dma_channel *channel = to_dma_channel(dev);
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return sprintf(buf, "0x%08x\n", channel->mode);
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}
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static ssize_t dma_store_mode(struct sys_device *dev,
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const char *buf, size_t count)
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{
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struct dma_channel *channel = to_dma_channel(dev);
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channel->mode = simple_strtoul(buf, NULL, 0);
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return count;
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}
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static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
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#define dma_ro_attr(field, fmt) \
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static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \
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{ \
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struct dma_channel *channel = to_dma_channel(dev); \
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return sprintf(buf, fmt, channel->field); \
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} \
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static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
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dma_ro_attr(count, "0x%08x\n");
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dma_ro_attr(flags, "0x%08lx\n");
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int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
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{
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struct sys_device *dev = &chan->dev;
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char name[16];
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int ret;
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dev->id = chan->vchan;
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dev->cls = &dma_sysclass;
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ret = sysdev_register(dev);
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if (ret)
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return ret;
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ret |= sysdev_create_file(dev, &attr_dev_id);
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ret |= sysdev_create_file(dev, &attr_count);
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ret |= sysdev_create_file(dev, &attr_mode);
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ret |= sysdev_create_file(dev, &attr_flags);
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ret |= sysdev_create_file(dev, &attr_config);
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if (unlikely(ret)) {
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dev_err(&info->pdev->dev, "Failed creating attrs\n");
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return ret;
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}
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snprintf(name, sizeof(name), "dma%d", chan->chan);
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return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
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}
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void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
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{
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struct sys_device *dev = &chan->dev;
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char name[16];
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sysdev_remove_file(dev, &attr_dev_id);
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sysdev_remove_file(dev, &attr_count);
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sysdev_remove_file(dev, &attr_mode);
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sysdev_remove_file(dev, &attr_flags);
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sysdev_remove_file(dev, &attr_config);
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snprintf(name, sizeof(name), "dma%d", chan->chan);
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sysfs_remove_link(&info->pdev->dev.kobj, name);
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sysdev_unregister(dev);
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}
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