C++ (Cpp) zynqmp_pll_is_enabled示例

示例#1

文件： pll.c 项目： na1pir/linux-xlnx

/**
 * zynqmp_pll_enable - Enable clock
 * @hw:		Handle between common and hardware-specific interfaces
 *
 * Return:	0 always
 */
static int zynqmp_pll_enable(struct clk_hw *hw)
{
	u32 reg;
	struct zynqmp_pll *clk = to_zynqmp_pll(hw);

	if (zynqmp_pll_is_enabled(hw))
		return 0;

	pr_info("PLL: enable\n");

	reg = zynqmp_pm_mmio_readl(clk->pll_ctrl);
	reg |= PLLCTRL_BP_MASK;
	zynqmp_pm_mmio_writel(reg, clk->pll_ctrl);
	reg |= PLLCTRL_RESET_MASK;
	zynqmp_pm_mmio_writel(reg, clk->pll_ctrl);

	reg &= ~(PLLCTRL_RESET_MASK);
	zynqmp_pm_mmio_writel(reg, clk->pll_ctrl);
	while (!(zynqmp_pm_mmio_readl(clk->pll_status) & (1 << clk->lockbit)))
		cpu_relax();

	reg &= ~PLLCTRL_BP_MASK;
	zynqmp_pm_mmio_writel(reg, clk->pll_ctrl);

	return 0;
}

示例#2

文件： pll.c 项目： enclustra-bsp/xilinx-linux

/**
 * zynqmp_pll_disable - Disable clock
 * @hw:		Handle between common and hardware-specific interfaces
 *
 */
static void zynqmp_pll_disable(struct clk_hw *hw)
{
	struct zynqmp_pll *clk = to_zynqmp_pll(hw);

	if (!zynqmp_pll_is_enabled(hw))
		return;

	pr_info("PLL: shutdown\n");

	/* shut down PLL */
	zynqmp_pm_mmio_write((u32)(ulong)clk->pll_ctrl, PLLCTRL_RESET_MASK,
				PLLCTRL_RESET_VAL);
}