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arm: msm: add vreg reference count 

Support independent enable and disable by clients for common
vreg. First enable switches on and last disable switches off.

This change has no check for voltage level so clients
must agree on level for common vreg.

Signed-off-by: Matthew Wilson <mtwilson@quicinc.com>
hifive-unleashed-5.1
Matt Wilson 2009-06-29 14:13:04 -05:00 committed by Daniel Walker
parent 4eab62519f
commit 0e44106de5
1 changed files with 79 additions and 36 deletions
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115
arch/arm/mach-msm/vreg.c
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@ -19,6 +19,7 @@
#include <linux/device.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/string.h>
#include <mach/vreg.h>
#include "proc_comm.h"
@ -27,43 +28,44 @@ struct vreg {
const char *name;
unsigned id;
int status;
unsigned refcnt;
};
#define VREG(_name, _id, _status) \
{ .name = _name, .id = _id, .status = _status }
#define VREG(_name, _id, _status, _refcnt) \
{ .name = _name, .id = _id, .status = _status, .refcnt = _refcnt }
static struct vreg vregs[] = {
VREG("msma", 0, 0),
VREG("msmp", 1, 0),
VREG("msme1", 2, 0),
VREG("msmc1", 3, 0),
VREG("msmc2", 4, 0),
VREG("gp3", 5, 0),
VREG("msme2", 6, 0),
VREG("gp4", 7, 0),
VREG("gp1", 8, 0),
VREG("tcxo", 9, 0),
VREG("pa", 10, 0),
VREG("rftx", 11, 0),
VREG("rfrx1", 12, 0),
VREG("rfrx2", 13, 0),
VREG("synt", 14, 0),
VREG("wlan", 15, 0),
VREG("usb", 16, 0),
VREG("boost", 17, 0),
VREG("mmc", 18, 0),
VREG("ruim", 19, 0),
VREG("msmc0", 20, 0),
VREG("gp2", 21, 0),
VREG("gp5", 22, 0),
VREG("gp6", 23, 0),
VREG("rf", 24, 0),
VREG("rf_vco", 26, 0),
VREG("mpll", 27, 0),
VREG("s2", 28, 0),
VREG("s3", 29, 0),
VREG("rfubm", 30, 0),
VREG("ncp", 31, 0),
VREG("msma", 0, 0, 0),
VREG("msmp", 1, 0, 0),
VREG("msme1", 2, 0, 0),
VREG("msmc1", 3, 0, 0),
VREG("msmc2", 4, 0, 0),
VREG("gp3", 5, 0, 0),
VREG("msme2", 6, 0, 0),
VREG("gp4", 7, 0, 0),
VREG("gp1", 8, 0, 0),
VREG("tcxo", 9, 0, 0),
VREG("pa", 10, 0, 0),
VREG("rftx", 11, 0, 0),
VREG("rfrx1", 12, 0, 0),
VREG("rfrx2", 13, 0, 0),
VREG("synt", 14, 0, 0),
VREG("wlan", 15, 0, 0),
VREG("usb", 16, 0, 0),
VREG("boost", 17, 0, 0),
VREG("mmc", 18, 0, 0),
VREG("ruim", 19, 0, 0),
VREG("msmc0", 20, 0, 0),
VREG("gp2", 21, 0, 0),
VREG("gp5", 22, 0, 0),
VREG("gp6", 23, 0, 0),
VREG("rf", 24, 0, 0),
VREG("rf_vco", 26, 0, 0),
VREG("mpll", 27, 0, 0),
VREG("s2", 28, 0, 0),
VREG("s3", 29, 0, 0),
VREG("rfubm", 30, 0, 0),
VREG("ncp", 31, 0, 0),
};
struct vreg *vreg_get(struct device *dev, const char *id)
@ -85,7 +87,12 @@ int vreg_enable(struct vreg *vreg)
unsigned id = vreg->id;
unsigned enable = 1;
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if (vreg->refcnt == 0)
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if ((vreg->refcnt < UINT_MAX) && (!vreg->status))
vreg->refcnt++;
return vreg->status;
}
@ -94,7 +101,15 @@ int vreg_disable(struct vreg *vreg)
unsigned id = vreg->id;
unsigned enable = 0;
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if (!vreg->refcnt)
return 0;
if (vreg->refcnt == 1)
vreg->status = msm_proc_comm(PCOM_VREG_SWITCH, &id, &enable);
if (!vreg->status)
vreg->refcnt--;
return vreg->status;
}
@ -137,21 +152,49 @@ static int vreg_debug_get(void *data, u64 *val)
return 0;
}
static int vreg_debug_count_set(void *data, u64 val)
{
struct vreg *vreg = data;
if (val > UINT_MAX)
val = UINT_MAX;
vreg->refcnt = val;
return 0;
}
static int vreg_debug_count_get(void *data, u64 *val)
{
struct vreg *vreg = data;
*val = vreg->refcnt;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vreg_fops, vreg_debug_get, vreg_debug_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(vreg_count_fops, vreg_debug_count_get,
vreg_debug_count_set, "%llu\n");
static int __init vreg_debug_init(void)
{
struct dentry *dent;
int n;
char name[32];
const char *refcnt_name = "_refcnt";
dent = debugfs_create_dir("vreg", 0);
if (IS_ERR(dent))
return 0;
for (n = 0; n < ARRAY_SIZE(vregs); n++)
for (n = 0; n < ARRAY_SIZE(vregs); n++) {
(void) debugfs_create_file(vregs[n].name, 0644,
dent, vregs + n, &vreg_fops);
strlcpy(name, vregs[n].name, sizeof(name));
strlcat(name, refcnt_name, sizeof(name));
(void) debugfs_create_file(name, 0644,
dent, vregs + n, &vreg_count_fops);
}
return 0;
}