1*ff4a7481SKuninori Morimoto // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * arch/sh/drivers/dma/dma-sysfs.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * sysfs interface for SH DMA API 61da177e4SLinus Torvalds * 74dfc119fSPaul Mundt * Copyright (C) 2004 - 2006 Paul Mundt 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds #include <linux/kernel.h> 101da177e4SLinus Torvalds #include <linux/init.h> 110c43871bSPaul Gortmaker #include <linux/stat.h> 12dc6876a2SKay Sievers #include <linux/device.h> 130d831770SPaul Mundt #include <linux/platform_device.h> 140d831770SPaul Mundt #include <linux/err.h> 154e57b681STim Schmielau #include <linux/string.h> 161da177e4SLinus Torvalds #include <asm/dma.h> 171da177e4SLinus Torvalds 18dc6876a2SKay Sievers static struct bus_type dma_subsys = { 19af5ca3f4SKay Sievers .name = "dma", 20dc6876a2SKay Sievers .dev_name = "dma", 211da177e4SLinus Torvalds }; 221da177e4SLinus Torvalds 23dc6876a2SKay Sievers static ssize_t dma_show_devices(struct device *dev, 24dc6876a2SKay Sievers struct device_attribute *attr, char *buf) 251da177e4SLinus Torvalds { 261da177e4SLinus Torvalds ssize_t len = 0; 271da177e4SLinus Torvalds int i; 281da177e4SLinus Torvalds 29e24cca19SPaul Mundt for (i = 0; i < 16; i++) { 301da177e4SLinus Torvalds struct dma_info *info = get_dma_info(i); 314dfc119fSPaul Mundt struct dma_channel *channel = get_dma_channel(i); 324dfc119fSPaul Mundt 334dfc119fSPaul Mundt if (unlikely(!info) || !channel) 344dfc119fSPaul Mundt continue; 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds len += sprintf(buf + len, "%2d: %14s %s\n", 371da177e4SLinus Torvalds channel->chan, info->name, 381da177e4SLinus Torvalds channel->dev_id); 391da177e4SLinus Torvalds } 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds return len; 421da177e4SLinus Torvalds } 431da177e4SLinus Torvalds 44dc6876a2SKay Sievers static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL); 451da177e4SLinus Torvalds 46dc6876a2SKay Sievers static int __init dma_subsys_init(void) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds int ret; 491da177e4SLinus Torvalds 50dc6876a2SKay Sievers ret = subsys_system_register(&dma_subsys, NULL); 51711fa809SPaul Mundt if (unlikely(ret)) 521da177e4SLinus Torvalds return ret; 531da177e4SLinus Torvalds 5487c34ed3SPaul Mundt return device_create_file(dma_subsys.dev_root, &dev_attr_devices); 55711fa809SPaul Mundt } 56dc6876a2SKay Sievers postcore_initcall(dma_subsys_init); 571da177e4SLinus Torvalds 58dc6876a2SKay Sievers static ssize_t dma_show_dev_id(struct device *dev, 59dc6876a2SKay Sievers struct device_attribute *attr, char *buf) 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 621da177e4SLinus Torvalds return sprintf(buf, "%s\n", channel->dev_id); 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 65dc6876a2SKay Sievers static ssize_t dma_store_dev_id(struct device *dev, 66dc6876a2SKay Sievers struct device_attribute *attr, 671da177e4SLinus Torvalds const char *buf, size_t count) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 701da177e4SLinus Torvalds strcpy(channel->dev_id, buf); 711da177e4SLinus Torvalds return count; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 74dc6876a2SKay Sievers static DEVICE_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 751da177e4SLinus Torvalds 76dc6876a2SKay Sievers static ssize_t dma_store_config(struct device *dev, 77dc6876a2SKay Sievers struct device_attribute *attr, 781da177e4SLinus Torvalds const char *buf, size_t count) 791da177e4SLinus Torvalds { 801da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 811da177e4SLinus Torvalds unsigned long config; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds config = simple_strtoul(buf, NULL, 0); 840d831770SPaul Mundt dma_configure_channel(channel->vchan, config); 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds return count; 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 89dc6876a2SKay Sievers static DEVICE_ATTR(config, S_IWUSR, NULL, dma_store_config); 901da177e4SLinus Torvalds 91dc6876a2SKay Sievers static ssize_t dma_show_mode(struct device *dev, 92dc6876a2SKay Sievers struct device_attribute *attr, char *buf) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 951da177e4SLinus Torvalds return sprintf(buf, "0x%08x\n", channel->mode); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 98dc6876a2SKay Sievers static ssize_t dma_store_mode(struct device *dev, 99dc6876a2SKay Sievers struct device_attribute *attr, 1001da177e4SLinus Torvalds const char *buf, size_t count) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 1031da177e4SLinus Torvalds channel->mode = simple_strtoul(buf, NULL, 0); 1041da177e4SLinus Torvalds return count; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 107dc6876a2SKay Sievers static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds #define dma_ro_attr(field, fmt) \ 110dc6876a2SKay Sievers static ssize_t dma_show_##field(struct device *dev, \ 111dc6876a2SKay Sievers struct device_attribute *attr, char *buf)\ 1121da177e4SLinus Torvalds { \ 1131da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); \ 1141da177e4SLinus Torvalds return sprintf(buf, fmt, channel->field); \ 1151da177e4SLinus Torvalds } \ 116dc6876a2SKay Sievers static DEVICE_ATTR(field, S_IRUGO, dma_show_##field, NULL); 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds dma_ro_attr(count, "0x%08x\n"); 1191da177e4SLinus Torvalds dma_ro_attr(flags, "0x%08lx\n"); 1201da177e4SLinus Torvalds 1210d831770SPaul Mundt int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) 1221da177e4SLinus Torvalds { 123dc6876a2SKay Sievers struct device *dev = &chan->dev; 1240d831770SPaul Mundt char name[16]; 1251da177e4SLinus Torvalds int ret; 1261da177e4SLinus Torvalds 1270d831770SPaul Mundt dev->id = chan->vchan; 128dc6876a2SKay Sievers dev->bus = &dma_subsys; 1291da177e4SLinus Torvalds 130dc6876a2SKay Sievers ret = device_register(dev); 1311da177e4SLinus Torvalds if (ret) 1321da177e4SLinus Torvalds return ret; 1331da177e4SLinus Torvalds 134dc6876a2SKay Sievers ret |= device_create_file(dev, &dev_attr_dev_id); 135dc6876a2SKay Sievers ret |= device_create_file(dev, &dev_attr_count); 136dc6876a2SKay Sievers ret |= device_create_file(dev, &dev_attr_mode); 137dc6876a2SKay Sievers ret |= device_create_file(dev, &dev_attr_flags); 138dc6876a2SKay Sievers ret |= device_create_file(dev, &dev_attr_config); 1394dfc119fSPaul Mundt 1404dfc119fSPaul Mundt if (unlikely(ret)) { 1414dfc119fSPaul Mundt dev_err(&info->pdev->dev, "Failed creating attrs\n"); 1424dfc119fSPaul Mundt return ret; 1434dfc119fSPaul Mundt } 1441da177e4SLinus Torvalds 1450d831770SPaul Mundt snprintf(name, sizeof(name), "dma%d", chan->chan); 1460d831770SPaul Mundt return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); 1470d831770SPaul Mundt } 1480d831770SPaul Mundt 1490d831770SPaul Mundt void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) 1500d831770SPaul Mundt { 151dc6876a2SKay Sievers struct device *dev = &chan->dev; 1520d831770SPaul Mundt char name[16]; 1530d831770SPaul Mundt 154dc6876a2SKay Sievers device_remove_file(dev, &dev_attr_dev_id); 155dc6876a2SKay Sievers device_remove_file(dev, &dev_attr_count); 156dc6876a2SKay Sievers device_remove_file(dev, &dev_attr_mode); 157dc6876a2SKay Sievers device_remove_file(dev, &dev_attr_flags); 158dc6876a2SKay Sievers device_remove_file(dev, &dev_attr_config); 1590d831770SPaul Mundt 1600d831770SPaul Mundt snprintf(name, sizeof(name), "dma%d", chan->chan); 1610d831770SPaul Mundt sysfs_remove_link(&info->pdev->dev.kobj, name); 1620d831770SPaul Mundt 163dc6876a2SKay Sievers device_unregister(dev); 1641da177e4SLinus Torvalds } 165