C++ reset_control_assert函数代码示例

static void stop_oxnas_usb_ehci(struct oxnas_hcd *oxnas)
{
	reset_control_assert(oxnas->rst_host);
	reset_control_assert(oxnas->rst_phya);
	reset_control_assert(oxnas->rst_phyb);

	if (oxnas->use_pllb) {
		clk_disable_unprepare(oxnas->phyref);
		clk_disable_unprepare(oxnas->refsrc);
	}
	clk_disable_unprepare(oxnas->clk);
}

static void histb_pcie_host_disable(struct histb_pcie *hipcie)
{
	reset_control_assert(hipcie->soft_reset);
	reset_control_assert(hipcie->sys_reset);
	reset_control_assert(hipcie->bus_reset);

	clk_disable_unprepare(hipcie->aux_clk);
	clk_disable_unprepare(hipcie->pipe_clk);
	clk_disable_unprepare(hipcie->sys_clk);
	clk_disable_unprepare(hipcie->bus_clk);

	if (gpio_is_valid(hipcie->reset_gpio))
		gpio_set_value_cansleep(hipcie->reset_gpio, 0);
}

static void tegra_ahci_power_off(struct ahci_host_priv *hpriv)
{
	struct tegra_ahci_priv *tegra = hpriv->plat_data;

	ahci_platform_disable_resources(hpriv);

	reset_control_assert(tegra->sata_rst);
	reset_control_assert(tegra->sata_oob_rst);
	reset_control_assert(tegra->sata_cold_rst);

	clk_disable_unprepare(tegra->sata_clk);
	tegra_powergate_power_off(TEGRA_POWERGATE_SATA);

	regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies);
}

static int ehci_platform_remove(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
	int clk;

	usb_remove_hcd(hcd);

	if (pdata->power_off)
		pdata->power_off(dev);

	if (priv->rst)
		reset_control_assert(priv->rst);

	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
		clk_put(priv->clks[clk]);

	usb_put_hcd(hcd);

	if (pdata == &ehci_platform_defaults)
		dev->dev.platform_data = NULL;

	return 0;
}

/* Must be called with clk disabled, and returns with clk enabled */
int tegra_powergate_sequence_power_up(int id, struct clk *clk,
					struct reset_control *rst)
{
	int ret;

	reset_control_assert(rst);

	ret = tegra_powergate_power_on(id);
	if (ret)
		goto err_power;

	ret = clk_prepare_enable(clk);
	if (ret)
		goto err_clk;

	udelay(10);

	ret = tegra_powergate_remove_clamping(id);
	if (ret)
		goto err_clamp;

	udelay(10);
	reset_control_deassert(rst);

	return 0;

err_clamp:
	clk_disable_unprepare(clk);
err_clk:
	tegra_powergate_power_off(id);
err_power:
	return ret;
}

static int dwc3_core_init_for_resume(struct dwc3 *dwc)
{
	int ret;

	ret = reset_control_deassert(dwc->reset);
	if (ret)
		return ret;

	ret = clk_bulk_prepare(dwc->num_clks, dwc->clks);
	if (ret)
		goto assert_reset;

	ret = clk_bulk_enable(dwc->num_clks, dwc->clks);
	if (ret)
		goto unprepare_clks;

	ret = dwc3_core_init(dwc);
	if (ret)
		goto disable_clks;

	return 0;

disable_clks:
	clk_bulk_disable(dwc->num_clks, dwc->clks);
unprepare_clks:
	clk_bulk_unprepare(dwc->num_clks, dwc->clks);
assert_reset:
	reset_control_assert(dwc->reset);

	return ret;
}

static int _alt_hps2fpga_enable_set(struct altera_hps2fpga_data *priv,
				    bool enable)
{
	unsigned long flags;
	int ret;

	/* bring bridge out of reset */
	if (enable)
		ret = reset_control_deassert(priv->bridge_reset);
	else
		ret = reset_control_assert(priv->bridge_reset);
	if (ret)
		return ret;

	/* Allow bridge to be visible to L3 masters or not */
	if (priv->remap_mask) {
		spin_lock_irqsave(&l3_remap_lock, flags);
		l3_remap_shadow |= ALT_L3_REMAP_MPUZERO_MSK;

		if (enable)
			l3_remap_shadow |= priv->remap_mask;
		else
			l3_remap_shadow &= ~priv->remap_mask;

		ret = regmap_write(priv->l3reg, ALT_L3_REMAP_OFST,
				   l3_remap_shadow);
		spin_unlock_irqrestore(&l3_remap_lock, flags);
	}

	return ret;
}

static int dwc3_of_simple_remove(struct platform_device *pdev)
{
	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
	struct device		*dev = &pdev->dev;
	int			i;

	of_platform_depopulate(dev);

	for (i = 0; i < simple->num_clocks; i++) {
		clk_disable_unprepare(simple->clks[i]);
		clk_put(simple->clks[i]);
	}
	simple->num_clocks = 0;

	if (!simple->pulse_resets)
		reset_control_assert(simple->resets);

	reset_control_put(simple->resets);

	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);
	pm_runtime_set_suspended(dev);

	return 0;
}

static void img_i2s_out_reset(struct img_i2s_out *i2s)
{
	int i;
	u32 core_ctl, chan_ctl;

	core_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL) &
			~IMG_I2S_OUT_CTL_ME_MASK &
			~IMG_I2S_OUT_CTL_DATA_EN_MASK;

	if (!i2s->force_clk_active)
		core_ctl &= ~IMG_I2S_OUT_CTL_CLK_EN_MASK;

	chan_ctl = img_i2s_out_ch_readl(i2s, 0, IMG_I2S_OUT_CH_CTL) &
			~IMG_I2S_OUT_CHAN_CTL_ME_MASK;

	reset_control_assert(i2s->rst);
	reset_control_deassert(i2s->rst);

	for (i = 0; i < i2s->max_i2s_chan; i++)
		img_i2s_out_ch_writel(i2s, i, chan_ctl, IMG_I2S_OUT_CH_CTL);

	for (i = 0; i < i2s->active_channels; i++)
		img_i2s_out_ch_enable(i2s, i);

	img_i2s_out_writel(i2s, core_ctl, IMG_I2S_OUT_CTL);
	img_i2s_out_enable(i2s);
}

static void i2c_dw_prepare_recovery(struct i2c_adapter *adap)
{
	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);

	i2c_dw_disable(dev);
	reset_control_assert(dev->rst);
	i2c_dw_prepare_clk(dev, false);
}

static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
{
	reset_control_assert(dp->rst);
	usleep_range(10, 20);
	reset_control_deassert(dp->rst);

	return 0;
}

static int socfpga_dwmac_set_phy_mode(struct socfpga_dwmac *dwmac)
{
	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
	int phymode = dwmac->interface;
	u32 reg_offset = dwmac->reg_offset;
	u32 reg_shift = dwmac->reg_shift;
	u32 ctrl, val, module;

	switch (phymode) {
	case PHY_INTERFACE_MODE_RGMII:
	case PHY_INTERFACE_MODE_RGMII_ID:
		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
		break;
	case PHY_INTERFACE_MODE_MII:
	case PHY_INTERFACE_MODE_GMII:
		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
		break;
	default:
		dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
		return -EINVAL;
	}

	/* Overwrite val to GMII if splitter core is enabled. The phymode here
	 * is the actual phy mode on phy hardware, but phy interface from
	 * EMAC core is GMII.
	 */
	if (dwmac->splitter_base)
		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;

	/* Assert reset to the enet controller before changing the phy mode */
	if (dwmac->stmmac_rst)
		reset_control_assert(dwmac->stmmac_rst);

	regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
	ctrl |= val << reg_shift;

	if (dwmac->f2h_ptp_ref_clk) {
		ctrl |= SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2);
		regmap_read(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
			    &module);
		module |= (SYSMGR_FPGAGRP_MODULE_EMAC << (reg_shift / 2));
		regmap_write(sys_mgr_base_addr, SYSMGR_FPGAGRP_MODULE_REG,
			     module);
	} else {
		ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2));
	}

	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);

	/* Deassert reset for the phy configuration to be sampled by
	 * the enet controller, and operation to start in requested mode
	 */
	if (dwmac->stmmac_rst)
		reset_control_deassert(dwmac->stmmac_rst);

	return 0;
}

static void sun6i_drc_unbind(struct device *dev, struct device *master,
			    void *data)
{
	struct sun6i_drc *drc = dev_get_drvdata(dev);

	clk_disable_unprepare(drc->mod_clk);
	clk_disable_unprepare(drc->bus_clk);
	reset_control_assert(drc->reset);
}

/**
 * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
 * DWC_otg driver
 *
 * @dev: Platform device
 *
 * This routine is called, for example, when the rmmod command is executed. The
 * device may or may not be electrically present. If it is present, the driver
 * stops device processing. Any resources used on behalf of this device are
 * freed.
 */
static int dwc2_driver_remove(struct platform_device *dev)
{
	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);

	dwc2_debugfs_exit(hsotg);
	if (hsotg->hcd_enabled)
		dwc2_hcd_remove(hsotg);
	if (hsotg->gadget_enabled)
		dwc2_hsotg_remove(hsotg);

	if (hsotg->ll_hw_enabled)
		dwc2_lowlevel_hw_disable(hsotg);

	reset_control_assert(hsotg->reset);
	reset_control_assert(hsotg->reset_ecc);

	return 0;
}

static void xhci_histb_host_disable(struct xhci_hcd_histb *histb)
{
	reset_control_assert(histb->soft_reset);

	clk_disable_unprepare(histb->suspend_clk);
	clk_disable_unprepare(histb->pipe_clk);
	clk_disable_unprepare(histb->utmi_clk);
	clk_disable_unprepare(histb->bus_clk);
}