Documentation/filesystems/00-INDEX


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94

00-INDEX
	- this file (info on some of the filesystems supported by linux).
Exporting
	- explanation of how to make filesystems exportable.
Locking
	- info on locking rules as they pertain to Linux VFS.
adfs.txt
	- info and mount options for the Acorn Advanced Disc Filing System.
afs.txt
	- info and examples for the distributed AFS (Andrew File System) fs.
affs.txt
	- info and mount options for the Amiga Fast File System.
automount-support.txt
	- information about filesystem automount support.
befs.txt
	- information about the BeOS filesystem for Linux.
bfs.txt
	- info for the SCO UnixWare Boot Filesystem (BFS).
cifs.txt
	- description of the CIFS filesystem.
coda.txt
	- description of the CODA filesystem.
configfs/
	- directory containing configfs documentation and example code.
cramfs.txt
	- info on the cram filesystem for small storage (ROMs etc).
dentry-locking.txt
	- info on the RCU-based dcache locking model.
directory-locking
	- info about the locking scheme used for directory operations.
dlmfs.txt
	- info on the userspace interface to the OCFS2 DLM.
ext2.txt
	- info, mount options and specifications for the Ext2 filesystem.
ext3.txt
	- info, mount options and specifications for the Ext3 filesystem.
ext4.txt
	- info, mount options and specifications for the Ext4 filesystem.
files.txt
	- info on file management in the Linux kernel.
fuse.txt
	- info on the Filesystem in User SpacE including mount options.
hfs.txt
	- info on the Macintosh HFS Filesystem for Linux.
hpfs.txt
	- info and mount options for the OS/2 HPFS.
isofs.txt
	- info and mount options for the ISO 9660 (CDROM) filesystem.
jfs.txt
	- info and mount options for the JFS filesystem.
ncpfs.txt
	- info on Novell Netware(tm) filesystem using NCP protocol.
ntfs.txt
	- info and mount options for the NTFS filesystem (Windows NT).
ocfs2.txt
	- info and mount options for the OCFS2 clustered filesystem.
porting
	- various information on filesystem porting.
proc.txt
	- info on Linux's /proc filesystem.
ramfs-rootfs-initramfs.txt
	- info on the 'in memory' filesystems ramfs, rootfs and initramfs.
reiser4.txt
	- info on the Reiser4 filesystem based on dancing tree algorithms.
relay.txt
	- info on relay, for efficient streaming from kernel to user space.
romfs.txt
	- description of the ROMFS filesystem.
smbfs.txt
	- info on using filesystems with the SMB protocol (Win 3.11 and NT).
spufs.txt
	- info and mount options for the SPU filesystem used on Cell.
sysfs-pci.txt
	- info on accessing PCI device resources through sysfs.
sysfs.txt
	- info on sysfs, a ram-based filesystem for exporting kernel objects.
sysv-fs.txt
	- info on the SystemV/V7/Xenix/Coherent filesystem.
tmpfs.txt
	- info on tmpfs, a filesystem that holds all files in virtual memory.
udf.txt
	- info and mount options for the UDF filesystem.
ufs.txt
	- info on the ufs filesystem.
v9fs.txt
	- v9fs is a Unix implementation of the Plan 9 9p remote fs protocol.
vfat.txt
	- info on using the VFAT filesystem used in Windows NT and Windows 95
vfs.txt
	- overview of the Virtual File System
xfs.txt
	- info and mount options for the XFS filesystem.
xip.txt
	- info on execute-in-place for file mappings.
/*
 * Windfarm PowerMac thermal control. SMU based sensors
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"

#define VERSION "0.2"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

/*
 * Various SMU "partitions" calibration objects for which we
 * keep pointers here for use by bits & pieces of the driver
 */
static struct smu_sdbp_cpuvcp *cpuvcp;
static int  cpuvcp_version;
static struct smu_sdbp_cpudiode *cpudiode;
static struct smu_sdbp_slotspow *slotspow;
static u8 *debugswitches;

/*
 * SMU basic sensors objects
 */

static LIST_HEAD(smu_ads);

struct smu_ad_sensor {
	struct list_head	link;
	u32			reg;		/* index in SMU */
	struct wf_sensor	sens;
};
#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)

static void smu_ads_release(struct wf_sensor *sr)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);

	kfree(ads);
}

static int smu_read_adc(u8 id, s32 *value)
{
	struct smu_simple_cmd	cmd;
	DECLARE_COMPLETION_ONSTACK(comp);
	int rc;

	rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
			      smu_done_complete, &comp, id);
	if (rc)
		return rc;
	wait_for_completion(&comp);
	if (cmd.cmd.status != 0)
		return cmd.cmd.status;
	if (cmd.cmd.reply_len != 2) {
		printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
		       id, cmd.cmd.reply_len);
		return -EIO;
	}
	*value = *((u16 *)cmd.buffer);
	return 0;
}

static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	int rc;
	s32 val;
	s64 scaled;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
	scaled >>= 3;
	scaled += ((s64)cpudiode->b_value) << 9;
	*value = (s32)(scaled << 1);

	return 0;
}

static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->curr_scale);
	scaled += (s32)cpuvcp->curr_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)cpuvcp->volt_scale);
	scaled += (s32)cpuvcp->volt_offset;
	*value = scaled << 4;

	return 0;
}

static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_ad_sensor *ads = to_smu_ads(sr);
	s32 val, scaled;
	int rc;

	rc = smu_read_adc(ads->reg, &val);
	if (rc) {
		printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
		       rc);
		return rc;
	}

	/* Ok, we have to scale & adjust, taking units into account */
	scaled = (s32)(val * (u32)slotspow->pow_scale);
	scaled += (s32)slotspow->pow_offset;
	*value = scaled << 4;

	return 0;
}


static struct wf_sensor_ops smu_cputemp_ops = {
	.get_value	= smu_cputemp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuamp_ops = {
	.get_value	= smu_cpuamp_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_cpuvolt_ops = {
	.get_value	= smu_cpuvolt_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};
static struct wf_sensor_ops smu_slotspow_ops = {
	.get_value	= smu_slotspow_get,
	.release	= smu_ads_release,
	.owner		= THIS_MODULE,
};


static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
{
	struct smu_ad_sensor *ads;
	const char *c, *l;
	const u32 *v;

	ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
	if (ads == NULL)
		return NULL;
	c = get_property(node, "device_type", NULL);
	l = get_property(node, "location", NULL);
	if (c == NULL || l == NULL)
		goto fail;

	/* We currently pick the sensors based on the OF name and location
	 * properties, while Darwin uses the sensor-id's.
	 * The problem with the IDs is that they are model specific while it
	 * looks like apple has been doing a reasonably good job at keeping
	 * the names and locations consistents so I'll stick with the names
	 * and locations for now.
	 */
	if (!strcmp(c, "temp-sensor") &&
	    !strcmp(l, "CPU T-Diode")) {
		ads->sens.ops = &smu_cputemp_ops;
		ads->sens.name = "cpu-temp";
		if (cpudiode == NULL) {
			DBG("wf: cpudiode partition (%02x) not found\n",
			    SMU_SDB_CPUDIODE_ID);
			goto fail;
		}
	} else if (!strcmp(c, "current-sensor") &&
		   !strcmp(l, "CPU Current")) {
		ads->sens.ops = &smu_cpuamp_ops;
		ads->sens.name = "cpu-current";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "voltage-sensor") &&
		   !strcmp(l, "CPU Voltage")) {
		ads->sens.ops = &smu_cpuvolt_ops;
		ads->sens.name = "cpu-voltage";
		if (cpuvcp == NULL) {
			DBG("wf: cpuvcp partition (%02x) not found\n",
			    SMU_SDB_CPUVCP_ID);
			goto fail;
		}
	} else if (!strcmp(c, "power-sensor") &&
		   !strcmp(l, "Slots Power")) {
		ads->sens.ops = &smu_slotspow_ops;
		ads->sens.name = "slots-power";
		if (slotspow == NULL) {
			DBG("wf: slotspow partition (%02x) not found\n",
			    SMU_SDB_SLOTSPOW_ID);
			goto fail;
		}
	} else
		goto fail;

	v = get_property(node, "reg", NULL);
	if (v == NULL)
		goto fail;
	ads->reg = *v;

	if (wf_register_sensor(&ads->sens))
		goto fail;
	return ads;
 fail:
	kfree(ads);
	return NULL;
}

/*
 * SMU Power combo sensor object
 */

struct smu_cpu_power_sensor {
	struct list_head	link;
	struct wf_sensor	*volts;
	struct wf_sensor	*amps;
	int			fake_volts : 1;
	int			quadratic : 1;
	struct wf_sensor	sens;
};
#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)

static struct smu_cpu_power_sensor *smu_cpu_power;

static void smu_cpu_power_release(struct wf_sensor *sr)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);

	if (pow->volts)
		wf_put_sensor(pow->volts);
	if (pow->amps)
		wf_put_sensor(pow->amps);
	kfree(pow);
}

static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
{
	struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
	s32 volts, amps, power;
	u64 tmps, tmpa, tmpb;
	int rc;