clk: tegra: Handle UTMIPLL IDDQ

Export UTMIPLL IDDQ functions. These will be needed when powergating the
XUSB partition.

Signed-off-by: BH Hsieh <bhsieh@nvidia.com>
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index 9a2512a6b4192090eb17e61da71f74659d64f68e..f89d2a912273bc660b645ebdec1c94a988cc5c9a 100644 (file)
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -2313,6 +2313,32 @@ static const char * const aclk_parents[] = {
        "clk_m"
 };
 
+void tegra210_put_utmipll_in_iddq(void)
+{
+       u32 reg;
+
+       reg = readl_relaxed(clk_base + UTMIPLL_HW_PWRDN_CFG0);
+
+       if (reg & UTMIPLL_HW_PWRDN_CFG0_UTMIPLL_LOCK) {
+               pr_err("trying to assert IDDQ while UTMIPLL is locked\n");
+               return;
+       }
+
+       reg |= UTMIPLL_HW_PWRDN_CFG0_IDDQ_OVERRIDE;
+       writel_relaxed(reg, clk_base + UTMIPLL_HW_PWRDN_CFG0);
+}
+EXPORT_SYMBOL_GPL(tegra210_put_utmipll_in_iddq);
+
+void tegra210_put_utmipll_out_iddq(void)
+{
+       u32 reg;
+
+       reg = readl_relaxed(clk_base + UTMIPLL_HW_PWRDN_CFG0);
+       reg &= ~UTMIPLL_HW_PWRDN_CFG0_IDDQ_OVERRIDE;
+       writel_relaxed(reg, clk_base + UTMIPLL_HW_PWRDN_CFG0);
+}
+EXPORT_SYMBOL_GPL(tegra210_put_utmipll_out_iddq);
+
 static __init void tegra210_periph_clk_init(void __iomem *clk_base,
                                            void __iomem *pmc_base)
 {

diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h
index 7007a5f480802ebcad8951b113f976801981a063..e17d32831e2846d0b6055ec35694917c5753c012 100644 (file)
--- a/include/linux/clk/tegra.h
+++ b/include/linux/clk/tegra.h
@@ -125,5 +125,7 @@ extern void tegra210_xusb_pll_hw_control_enable(void);
 extern void tegra210_xusb_pll_hw_sequence_start(void);
 extern void tegra210_sata_pll_hw_control_enable(void);
 extern void tegra210_sata_pll_hw_sequence_start(void);
+extern void tegra210_put_utmipll_in_iddq(void);
+extern void tegra210_put_utmipll_out_iddq(void);
 
 #endif /* __LINUX_CLK_TEGRA_H_ */