linux_kernel/drivers/gpu/drm/omapdrm/dss/hdmi_pll.c

/*
 * HDMI PLL
 *
 * Copyright (C) 2013 Texas Instruments Incorporated
 *
 * 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.
 */

#define DSS_SUBSYS_NAME "HDMIPLL"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/seq_file.h>
#include <linux/pm_runtime.h>

#include "omapdss.h"
#include "dss.h"
#include "hdmi.h"

void hdmi_pll_dump(struct hdmi_pll_data *pll, struct seq_file *s)
{
#define DUMPPLL(r) seq_printf(s, "%-35s %08x\n", #r,\
		hdmi_read_reg(pll->base, r))

	DUMPPLL(PLLCTRL_PLL_CONTROL);
	DUMPPLL(PLLCTRL_PLL_STATUS);
	DUMPPLL(PLLCTRL_PLL_GO);
	DUMPPLL(PLLCTRL_CFG1);
	DUMPPLL(PLLCTRL_CFG2);
	DUMPPLL(PLLCTRL_CFG3);
	DUMPPLL(PLLCTRL_SSC_CFG1);
	DUMPPLL(PLLCTRL_SSC_CFG2);
	DUMPPLL(PLLCTRL_CFG4);
}

static int hdmi_pll_enable(struct dss_pll *dsspll)
{
	struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
	struct hdmi_wp_data *wp = pll->wp;
	int r;

	r = pm_runtime_get_sync(&pll->pdev->dev);
	WARN_ON(r < 0);

	dss_ctrl_pll_enable(DSS_PLL_HDMI, true);

	r = hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_BOTHON_ALLCLKS);
	if (r)
		return r;

	return 0;
}

static void hdmi_pll_disable(struct dss_pll *dsspll)
{
	struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
	struct hdmi_wp_data *wp = pll->wp;
	int r;

	hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF);

	dss_ctrl_pll_enable(DSS_PLL_HDMI, false);

	r = pm_runtime_put_sync(&pll->pdev->dev);
	WARN_ON(r < 0 && r != -ENOSYS);
}

static const struct dss_pll_ops dsi_pll_ops = {
	.enable = hdmi_pll_enable,
	.disable = hdmi_pll_disable,
	.set_config = dss_pll_write_config_type_b,
};

static const struct dss_pll_hw dss_omap4_hdmi_pll_hw = {
	.type = DSS_PLL_TYPE_B,

	.n_max = 255,
	.m_min = 20,
	.m_max = 4095,
	.mX_max = 127,
	.fint_min = 500000,
	.fint_max = 2500000,

	.clkdco_min = 500000000,
	.clkdco_low = 1000000000,
	.clkdco_max = 2000000000,

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

	.mX_msb[0] = 24,
	.mX_lsb[0] = 18,

	.has_selfreqdco = true,
};

static const struct dss_pll_hw dss_omap5_hdmi_pll_hw = {
	.type = DSS_PLL_TYPE_B,

	.n_max = 255,
	.m_min = 20,
	.m_max = 2045,
	.mX_max = 127,
	.fint_min = 620000,
	.fint_max = 2500000,

	.clkdco_min = 750000000,
	.clkdco_low = 1500000000,
	.clkdco_max = 2500000000UL,

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

	.mX_msb[0] = 24,
	.mX_lsb[0] = 18,

	.has_selfreqdco = true,
	.has_refsel = true,
};

static int dsi_init_pll_data(struct platform_device *pdev, struct hdmi_pll_data *hpll)
{
	struct dss_pll *pll = &hpll->pll;
	struct clk *clk;
	int r;

	clk = devm_clk_get(&pdev->dev, "sys_clk");
	if (IS_ERR(clk)) {
		DSSERR("can't get sys_clk\n");
		return PTR_ERR(clk);
	}

	pll->name = "hdmi";
	pll->id = DSS_PLL_HDMI;
	pll->base = hpll->base;
	pll->clkin = clk;

	switch (omapdss_get_version()) {
	case OMAPDSS_VER_OMAP4430_ES1:
	case OMAPDSS_VER_OMAP4430_ES2:
	case OMAPDSS_VER_OMAP4:
		pll->hw = &dss_omap4_hdmi_pll_hw;
		break;

	case OMAPDSS_VER_OMAP5:
	case OMAPDSS_VER_DRA7xx:
		pll->hw = &dss_omap5_hdmi_pll_hw;
		break;

	default:
		return -ENODEV;
	}

	pll->ops = &dsi_pll_ops;

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

	return 0;
}

int hdmi_pll_init(struct platform_device *pdev, struct hdmi_pll_data *pll,
	struct hdmi_wp_data *wp)
{
	int r;
	struct resource *res;

	pll->pdev = pdev;
	pll->wp = wp;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pll");
	if (!res) {
		DSSERR("can't get PLL mem resource\n");
		return -EINVAL;
	}

	pll->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(pll->base)) {
		DSSERR("can't ioremap PLLCTRL\n");
		return PTR_ERR(pll->base);
	}

	r = dsi_init_pll_data(pdev, pll);
	if (r) {
		DSSERR("failed to init HDMI PLL\n");
		return r;
	}

	return 0;
}

void hdmi_pll_uninit(struct hdmi_pll_data *hpll)
{
	struct dss_pll *pll = &hpll->pll;

	dss_pll_unregister(pll);
}