^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * arch/sh/drivers/dma/dma-sysfs.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * sysfs interface for SH DMA API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2004 - 2006 Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/dma.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct bus_type dma_subsys = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) .name = "dma",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) .dev_name = "dma",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static ssize_t dma_show_devices(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ssize_t len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) for (i = 0; i < 16; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct dma_info *info = get_dma_info(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct dma_channel *channel = get_dma_channel(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (unlikely(!info) || !channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) len += sprintf(buf + len, "%2d: %14s %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) channel->chan, info->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) channel->dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int __init dma_subsys_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = subsys_system_register(&dma_subsys, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return device_create_file(dma_subsys.dev_root, &dev_attr_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) postcore_initcall(dma_subsys_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static ssize_t dma_show_dev_id(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct dma_channel *channel = to_dma_channel(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return sprintf(buf, "%s\n", channel->dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static ssize_t dma_store_dev_id(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct dma_channel *channel = to_dma_channel(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) strcpy(channel->dev_id, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static DEVICE_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static ssize_t dma_store_config(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct dma_channel *channel = to_dma_channel(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned long config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) config = simple_strtoul(buf, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) dma_configure_channel(channel->vchan, config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static DEVICE_ATTR(config, S_IWUSR, NULL, dma_store_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static ssize_t dma_show_mode(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct dma_channel *channel = to_dma_channel(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return sprintf(buf, "0x%08x\n", channel->mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static ssize_t dma_store_mode(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct dma_channel *channel = to_dma_channel(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) channel->mode = simple_strtoul(buf, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #define dma_ro_attr(field, fmt) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static ssize_t dma_show_##field(struct device *dev, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct device_attribute *attr, char *buf)\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct dma_channel *channel = to_dma_channel(dev); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return sprintf(buf, fmt, channel->field); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static DEVICE_ATTR(field, S_IRUGO, dma_show_##field, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) dma_ro_attr(count, "0x%08x\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) dma_ro_attr(flags, "0x%08lx\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct device *dev = &chan->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) char name[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) dev->id = chan->vchan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) dev->bus = &dma_subsys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ret = device_register(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ret |= device_create_file(dev, &dev_attr_dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) ret |= device_create_file(dev, &dev_attr_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ret |= device_create_file(dev, &dev_attr_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret |= device_create_file(dev, &dev_attr_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ret |= device_create_file(dev, &dev_attr_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (unlikely(ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) dev_err(&info->pdev->dev, "Failed creating attrs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) snprintf(name, sizeof(name), "dma%d", chan->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct device *dev = &chan->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) char name[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) device_remove_file(dev, &dev_attr_dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) device_remove_file(dev, &dev_attr_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) device_remove_file(dev, &dev_attr_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) device_remove_file(dev, &dev_attr_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) device_remove_file(dev, &dev_attr_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) snprintf(name, sizeof(name), "dma%d", chan->chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) sysfs_remove_link(&info->pdev->dev.kobj, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) device_unregister(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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