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Commit 6a0e7c24 authored by Rama Aparna Mallavarapu's avatar Rama Aparna Mallavarapu
Browse files

PM / devfreq: bimc-bwmon: Add support for version 2 



The version 2 of the BIMC BWMON HW doesn't reset the counter to 0 when it
hits the threshold. It also has support for an overflow status register.

Change-Id: I9f18d2153a2e5e762ec9950f26e0e7601468a80a
Signed-off-by: default avatarSaravana Kannan <skannan@codeaurora.org>
Signed-off-by: default avatarRama Aparna Mallavarapu <aparnam@codeaurora.org>
parent b4ec3a14

drivers/devfreq/bimc-bwmon.c

+48 −13
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/spinlock.h>

#include "governor_bw_hwmon.h"
@@ -31,11 +32,17 @@ 
#define MON_MASK(m)		((m)->base + 0x298)

#define MON_MATCH(m)		((m)->base + 0x29C)



struct bwmon_spec {

	bool wrap_on_thres;

	bool overflow;

};



struct bwmon {

	void __iomem *base;

	void __iomem *global_base;

	unsigned int mport;

	unsigned int irq;

	const struct bwmon_spec *spec;

	struct device *dev;

	struct bw_hwmon hw;

};
@@ -94,7 +101,7 @@ static void mon_irq_disable(struct bwmon *m) 
	writel_relaxed(val, MON_INT_EN(m));

}



static int mon_irq_status(struct bwmon *m)

static unsigned int mon_irq_status(struct bwmon *m)

{

	u32 mval;
@@ -103,12 +110,12 @@ static int mon_irq_status(struct bwmon *m) 
	dev_dbg(m->dev, "IRQ status p:%x, g:%x\n", mval,

			readl_relaxed(GLB_INT_STATUS(m)));



	return mval & 0x1;

	return mval;

}



static void mon_irq_clear(struct bwmon *m)

{

	writel_relaxed(0x1, MON_INT_CLR(m));

	writel_relaxed(0x3, MON_INT_CLR(m));

	/* Ensure the monitor IRQ is clear before clearing GLB IRQ */

	mb();

	writel_relaxed(1 << m->mport, GLB_INT_CLR(m));
@@ -127,14 +134,22 @@ static u32 mon_get_limit(struct bwmon *m) 
	return readl_relaxed(MON_THRES(m));

}



#define THRES_HIT(status)	(status & BIT(0))

#define OVERFLOW(status)	(status & BIT(1))

static unsigned long mon_get_count(struct bwmon *m)

{

	unsigned long count;

	unsigned long count, status;



	count = readl_relaxed(MON_CNT(m));

	status = mon_irq_status(m);



	dev_dbg(m->dev, "Counter: %08lx\n", count);

	if (mon_irq_status(m))



	if (OVERFLOW(status) && m->spec->overflow)

		count += 0xFFFFFFFF;

	if (THRES_HIT(status) && m->spec->wrap_on_thres)

		count += mon_get_limit(m);



	dev_dbg(m->dev, "Actual Count: %08lx\n", count);



	return count;
@@ -173,11 +188,17 @@ static unsigned long meas_bw_and_set_irq(struct bw_hwmon *hw, 


	mbps = mon_get_count(m);

	mbps = bytes_to_mbps(mbps, us);



	/*

	 * The fudging of mbps when calculating limit is to workaround a HW

	 * design issue. Needs further tuning.

	 * If the counter wraps on thres, don't set the thres too low.

	 * Setting it too low runs the risk of the counter wrapping around

	 * multiple times before the IRQ is processed.

	 */

	if (likely(!m->spec->wrap_on_thres))

		limit = mbps_to_bytes(mbps, sample_ms, tol);

	else

		limit = mbps_to_bytes(max(mbps, 400UL), sample_ms, tol);



	mon_set_limit(m, limit);



	mon_clear(m);
@@ -273,11 +294,23 @@ static int resume_bw_hwmon(struct bw_hwmon *hw) 


/*************************************************************************/



static const struct bwmon_spec spec[] = {

	{ .wrap_on_thres = true, .overflow = false },

	{ .wrap_on_thres = false, .overflow = true },

};



static const struct of_device_id bimc_bwmon_match_table[] = {

	{ .compatible = "qcom,bimc-bwmon", .data = &spec[0] },

	{ .compatible = "qcom,bimc-bwmon2", .data = &spec[1] },

	{}

};



static int bimc_bwmon_driver_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct resource *res;

	struct bwmon *m;

	const struct of_device_id *id;

	int ret;

	u32 data;
@@ -293,6 +326,13 @@ static int bimc_bwmon_driver_probe(struct platform_device *pdev) 
	}

	m->mport = data;



	id = of_match_device(bimc_bwmon_match_table, dev);

	if (!id) {

		dev_err(dev, "Unknown device type!\n");

		return -ENODEV;

	}

	m->spec = id->data;



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");

	if (!res) {

		dev_err(dev, "base not found!\n");
@@ -339,11 +379,6 @@ static int bimc_bwmon_driver_probe(struct platform_device *pdev) 
	return 0;

}



static const struct of_device_id bimc_bwmon_match_table[] = {

	{ .compatible = "qcom,bimc-bwmon" },

	{}

};



static struct platform_driver bimc_bwmon_driver = {

	.probe = bimc_bwmon_driver_probe,

	.driver = {