/*
* Copyright (C) 2014 Texas Instruments Ltd
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License along with
* this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/sched.h>

#include <video/omapfb_dss.h>

#include "dss.h"
#include "dss_features.h"

struct dss_video_pll {
	struct dss_pll pll;

	struct device *dev;

	void __iomem *clkctrl_base;
};

#define REG_MOD(reg, val, start, end) \
	writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg)

static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll)
{
	REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */
}

static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll)
{
	REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */
}

static void dss_dpll_power_enable(struct dss_video_pll *vpll)
{
	REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */

	/*
	 * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0,
	 * so we have to use fixed delay here.
	 */
	msleep(1);
}

static void dss_dpll_power_disable(struct dss_video_pll *vpll)
{
	REG_MOD(vpll->clkctrl_base, 0, 31, 30);	/* PLL_POWER_OFF */
}

static int dss_video_pll_enable(struct dss_pll *pll)
{
	struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
	int r;

	r = dss_runtime_get();
	if (r)
		return r;

	dss_ctrl_pll_enable(pll->id, true);

	dss_dpll_enable_scp_clk(vpll);

	r = dss_pll_wait_reset_done(pll);
	if (r)
		goto err_reset;

	dss_dpll_power_enable(vpll);

	return 0;

err_reset:
	dss_dpll_disable_scp_clk(vpll);
	dss_ctrl_pll_enable(pll->id, false);
	dss_runtime_put();

	return r;
}

static void dss_video_pll_disable(struct dss_pll *pll)
{
	struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);

	dss_dpll_power_disable(vpll);

	dss_dpll_disable_scp_clk(vpll);

	dss_ctrl_pll_enable(pll->id, false);

	dss_runtime_put();
}

static const struct dss_pll_ops dss_pll_ops = {
	.enable = dss_video_pll_enable,
	.disable = dss_video_pll_disable,
	.set_config = dss_pll_write_config_type_a,
};

static const struct dss_pll_hw dss_dra7_video_pll_hw = {
	.n_max = (1 << 8) - 1,
	.m_max = (1 << 12) - 1,
	.mX_max = (1 << 5) - 1,
	.fint_min = 500000,
	.fint_max = 2500000,
	.clkdco_max = 1800000000,

	.n_msb = 8,
	.n_lsb = 1,
	.m_msb = 20,
	.m_lsb = 9,

	.mX_msb[0] = 25,
	.mX_lsb[0] = 21,
	.mX_msb[1] = 30,
	.mX_lsb[1] = 26,

	.has_refsel = true,
};

struct dss_pll *dss_video_pll_init(struct platform_device *pdev, int id,
	struct regulator *regulator)
{
	const char * const reg_name[] = { "pll1", "pll2" };
	const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" };
	const char * const clkin_name[] = { "video1_clk", "video2_clk" };

	struct resource *res;
	struct dss_video_pll *vpll;
	void __iomem *pll_base, *clkctrl_base;
	struct clk *clk;
	struct dss_pll *pll;
	int r;

	/* PLL CONTROL */

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name[id]);
	if (!res) {
		dev_err(&pdev->dev,
			"missing platform resource data for pll%d\n", id);
		return ERR_PTR(-ENODEV);
	}

	pll_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(pll_base)) {
		dev_err(&pdev->dev, "failed to ioremap pll%d reg_name\n", id);
		return ERR_CAST(pll_base);
	}

	/* CLOCK CONTROL */

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
		clkctrl_name[id]);
	if (!res) {
		dev_err(&pdev->dev,
			"missing platform resource data for pll%d\n", id);
		return ERR_PTR(-ENODEV);
	}

	clkctrl_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(clkctrl_base)) {
		dev_err(&pdev->dev, "failed to ioremap pll%d clkctrl\n", id);
		return ERR_CAST(clkctrl_base);
	}

	/* CLKIN */

	clk = devm_clk_get(&pdev->dev, clkin_name[id]);
	if (IS_ERR(clk)) {
		DSSERR("can't get video pll clkin\n");
		return ERR_CAST(clk);
	}

	vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL);
	if (!vpll)
		return ERR_PTR(-ENOMEM);

	vpll->dev = &pdev->dev;
	vpll->clkctrl_base = clkctrl_base;

	pll = &vpll->pll;

	pll->name = id == 0 ? "video0" : "video1";
	pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2;
	pll->clkin = clk;
	pll->regulator = regulator;
	pll->base = pll_base;
	pll->hw = &dss_dra7_video_pll_hw;
	pll->ops = &dss_pll_ops;

	r = dss_pll_register(pll);
	if (r)
		return ERR_PTR(r);

	return pll;
}

void dss_video_pll_uninit(struct dss_pll *pll)
{
	dss_pll_unregister(pll);
}
/tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-30 19:27:10 -0500</td></tr>
<tr><th>committer</th><td>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-31 09:13:49 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/intel-pt.txt?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>79c6f448c8b79c321e4a1f31f98194e4f6b6cae7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/Documentation/intel-pt.txt?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>370efda701f03cccf21e02bb1fdd3b852547d75c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/Documentation/intel-pt.txt?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>tools/perf/Documentation/intel-pt.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/intel-pt.txt?id=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>0c744ea4f77d72b3dcebb7a8f2684633ec79be88</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/Documentation/intel-pt.txt?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7&amp;id2=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>diff</a>)</td></tr></table>
<div class='commit-subject'>tracing: Fix hwlat kthread migration</div><div class='commit-msg'>The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.

The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.

Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>Diffstat</a> (limited to 'tools/perf/Documentation/intel-pt.txt')</div><table summary='diffstat' class='diffstat'>