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Commit 596e7955 authored by Faiz Abbas's avatar Faiz Abbas Committed by Tony Lindgren
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bus: ti-sysc: Add support for software reset



Add support for the software reset of a target interconnect
module using its sysconfig and sysstatus registers.

Signed-off-by: default avatarFaiz Abbas <faiz_abbas@ti.com>
[tony@atomide.com: updated to check if sysconfig exists]
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 7f35e63d
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+46 −0
Original line number Diff line number Diff line
@@ -23,11 +23,14 @@
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/iopoll.h>

#include <linux/platform_data/ti-sysc.h>

#include <dt-bindings/bus/ti-sysc.h>

#define MAX_MODULE_SOFTRESET_WAIT		10000

static const char * const reg_names[] = { "rev", "sysc", "syss", };

enum sysc_clocks {
@@ -88,6 +91,11 @@ struct sysc {
	struct delayed_work idle_work;
};

void sysc_write(struct sysc *ddata, int offset, u32 value)
{
	writel_relaxed(value, ddata->module_va + offset);
}

static u32 sysc_read(struct sysc *ddata, int offset)
{
	if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
@@ -943,6 +951,36 @@ static void sysc_init_revision_quirks(struct sysc *ddata)
	}
}

static int sysc_reset(struct sysc *ddata)
{
	int offset = ddata->offsets[SYSC_SYSCONFIG];
	int val;

	if (ddata->legacy_mode || offset < 0 ||
	    ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
		return 0;

	/*
	 * Currently only support reset status in sysstatus.
	 * Warn and return error in all other cases
	 */
	if (!ddata->cfg.syss_mask) {
		dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n");
		return -EINVAL;
	}

	val = sysc_read(ddata, offset);
	val |= (0x1 << ddata->cap->regbits->srst_shift);
	sysc_write(ddata, offset, val);

	/* Poll on reset status */
	offset = ddata->offsets[SYSC_SYSSTATUS];

	return readl_poll_timeout(ddata->module_va + offset, val,
				  (val & ddata->cfg.syss_mask) == 0x0,
				  100, MAX_MODULE_SOFTRESET_WAIT);
}

/* At this point the module is configured enough to read the revision */
static int sysc_init_module(struct sysc *ddata)
{
@@ -960,6 +998,14 @@ static int sysc_init_module(struct sysc *ddata)
		return 0;
	}

	error = sysc_reset(ddata);
	if (error) {
		dev_err(ddata->dev, "Reset failed with %d\n", error);
		pm_runtime_put_sync(ddata->dev);

		return error;
	}

	ddata->revision = sysc_read_revision(ddata);
	pm_runtime_put_sync(ddata->dev);