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Commit 8d8741c0 authored by Venkatesh Yadav Abbarapu's avatar Venkatesh Yadav Abbarapu
Browse files

misc: qfpfuse: Add dt support to read blow timeout 



Read the blow timer value from device tree. The fuse blow timeout
is different for different hardware implementations.

Change-Id: I77151e04af4892c9569b07e87d6d7ce761c7e4ff
Acked-by: default avatarKaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: default avatarVenkatesh Yadav Abbarapu <quicvenkat@codeaurora.org>
parent 446ea2a0

Documentation/devicetree/bindings/misc/qfp-fuse.txt

+9 −0
Original line number Diff line number Diff line
@@ -15,6 +15,15 @@ Optional Properties: 
- qti,blow-status-offset: offset of the blow status registers.

  The default offset is 0x204C. Include this only if the blow status register

  is at the different offset.

- qti,blow-timer: blow timer value.

  The value specifies the blow time in number of blow timer clock cycles.

  The default setting is 0xF0. It meets the requirement for 28nm HPm fuse

  technology with blow timer clock at 19.2Mhz (12us blow time).

  Specify this only if the fuse blow time is different. The following are the

  recommended settings:

  - 0x280 (10us) for 45nm LP technology with 64Mhz blow timer clock

  - 0x100 (4us)  for 28nm LP technology with 64Mhz blow timer clock

  - 0x1E  (12us) for 28nm LP technology with 2.5Mhz blow timer clock



Example:

	qti,qfpfuse@fc4b8000 {

drivers/misc/qfp_fuse.c

+9 −2
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ 
/*

 * Denotes number of cycles required to blow the fuse.

 */

#define QFPROM_BLOW_TIMER_VALUE     (QFPROM_BLOW_TIMEOUT_US * 83)

#define QFPROM_BLOW_TIMER_VALUE     0xF0



#define QFPROM_BLOW_STATUS_OFFSET   0x204C

#define QFPROM_BLOW_STATUS_BUSY     0x01
@@ -51,6 +51,7 @@ struct qfp_priv_t { 
	uint32_t base;

	uint32_t end;

	uint32_t blow_status_offset;

	uint32_t blow_timer;

	struct mutex lock;

	struct regulator *fuse_vdd;

	u8 state;
@@ -60,6 +61,7 @@ struct qfp_resource { 
	resource_size_t	start;

	resource_size_t	size;

	uint32_t	blow_status_offset;

	uint32_t	blow_timer;

	const char	*regulator_name;

};
@@ -143,7 +145,7 @@ static int qfp_fuse_write_word(u32 *addr, u32 data) 
	int err;



	/* Set QFPROM  blow timer register */

	writel_relaxed(QFPROM_BLOW_TIMER_VALUE,

	writel_relaxed(qfp_priv->blow_timer,

			qfp_priv->base + QFPROM_BLOW_TIMER_OFFSET);

	mb();
@@ -344,6 +346,7 @@ static int qfp_get_resource(struct platform_device *pdev, 
	struct resource *res;

	const char *regulator_name = NULL;

	uint32_t blow_status_offset = QFPROM_BLOW_STATUS_OFFSET;

	uint32_t blow_timer = QFPROM_BLOW_TIMER_VALUE;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)
@@ -369,6 +372,8 @@ static int qfp_get_resource(struct platform_device *pdev, 
			return -EINVAL;

		}



		of_property_read_u32(np, "qti,blow-timer", &blow_timer);



	} else {

		regulator_name = pdev->dev.platform_data;

	}
@@ -379,6 +384,7 @@ static int qfp_get_resource(struct platform_device *pdev, 
	qfp_res->start = res->start;

	qfp_res->size = resource_size(res);

	qfp_res->blow_status_offset = blow_status_offset;

	qfp_res->blow_timer = blow_timer;

	qfp_res->regulator_name = regulator_name;



	return 0;
@@ -408,6 +414,7 @@ static int qfp_fuse_probe(struct platform_device *pdev) 
	}

	qfp_priv->end = qfp_priv->base + res.size;

	qfp_priv->blow_status_offset = res.blow_status_offset;

	qfp_priv->blow_timer = res.blow_timer;



	/* Get regulator for QFPROM writes */

	qfp_priv->fuse_vdd = regulator_get(&pdev->dev, res.regulator_name);