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Commit 0e44106d authored by Matt Wilson's avatar Matt Wilson Committed by Daniel Walker
Browse files

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: default avatarMatthew Wilson <mtwilson@quicinc.com>
parent 4eab6251

arch/arm/mach-msm/vreg.c

+79 −36
Original line number Diff line number Diff line
@@ -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;



	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;



	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;

}