1 // SPDX-License-Identifier: GPL-2.0+
8 #include <linux/clk-provider.h>
9 #include <linux/delay.h>
16 #include "clk-scu.h"
25  * struct clk_lpcg_scu - Description of LPCG clock
46 /* e10858 -LPCG clock gating register synchronization errata */
54 		 * through the interconnect is longer than the minimum delay  in lpcg_e10858_writel()
55 		 * of 4 clock cycles required by the errata.  in lpcg_e10858_writel()
56 		 * Adding a readl will provide sufficient delay to prevent  in lpcg_e10858_writel()
57 		 * back-to-back writes.  in lpcg_e10858_writel()
63 		 * 4 clock cycles.  in lpcg_e10858_writel()
71 	struct clk_lpcg_scu *clk = to_clk_lpcg_scu(hw);  in clk_lpcg_scu_enable()  local
77 	reg = readl_relaxed(clk->reg);  in clk_lpcg_scu_enable()
78 	reg &= ~(CLK_GATE_SCU_LPCG_MASK << clk->bit_idx);  in clk_lpcg_scu_enable()
81 	if (clk->hw_gate)  in clk_lpcg_scu_enable()
84 	reg |= val << clk->bit_idx;  in clk_lpcg_scu_enable()
86 	lpcg_e10858_writel(clk_hw_get_rate(hw), clk->reg, reg);  in clk_lpcg_scu_enable()
95 	struct clk_lpcg_scu *clk = to_clk_lpcg_scu(hw);  in clk_lpcg_scu_disable()  local
101 	reg = readl_relaxed(clk->reg);  in clk_lpcg_scu_disable()
102 	reg &= ~(CLK_GATE_SCU_LPCG_MASK << clk->bit_idx);  in clk_lpcg_scu_disable()
103 	lpcg_e10858_writel(clk_hw_get_rate(hw), clk->reg, reg);  in clk_lpcg_scu_disable()
117 	struct clk_lpcg_scu *clk;  in __imx_clk_lpcg_scu()  local
122 	clk = kzalloc(sizeof(*clk), GFP_KERNEL);  in __imx_clk_lpcg_scu()
123 	if (!clk)  in __imx_clk_lpcg_scu()
124 		return ERR_PTR(-ENOMEM);  in __imx_clk_lpcg_scu()
126 	clk->reg = reg;  in __imx_clk_lpcg_scu()
127 	clk->bit_idx = bit_idx;  in __imx_clk_lpcg_scu()
128 	clk->hw_gate = hw_gate;  in __imx_clk_lpcg_scu()
136 	clk->hw.init = &init;  in __imx_clk_lpcg_scu()
138 	hw = &clk->hw;  in __imx_clk_lpcg_scu()
141 		kfree(clk);  in __imx_clk_lpcg_scu()
147 		dev_set_drvdata(dev, clk);  in __imx_clk_lpcg_scu()
154 	struct clk_lpcg_scu *clk = to_clk_lpcg_scu(hw);  in imx_clk_lpcg_scu_unregister()  local
156 	clk_hw_unregister(&clk->hw);  in imx_clk_lpcg_scu_unregister()
157 	kfree(clk);  in imx_clk_lpcg_scu_unregister()
162 	struct clk_lpcg_scu *clk = dev_get_drvdata(dev);  in imx_clk_lpcg_scu_suspend()  local
164 	if (!strncmp("hdmi_lpcg", clk_hw_get_name(&clk->hw), strlen("hdmi_lpcg")))  in imx_clk_lpcg_scu_suspend()
167 	clk->state = readl_relaxed(clk->reg);  in imx_clk_lpcg_scu_suspend()
168 	dev_dbg(dev, "save lpcg state 0x%x\n", clk->state);  in imx_clk_lpcg_scu_suspend()
175 	struct clk_lpcg_scu *clk = dev_get_drvdata(dev);  in imx_clk_lpcg_scu_resume()  local
177 	if (!strncmp("hdmi_lpcg", clk_hw_get_name(&clk->hw), strlen("hdmi_lpcg")))  in imx_clk_lpcg_scu_resume()
180 	writel(clk->state, clk->reg);  in imx_clk_lpcg_scu_resume()
181 	lpcg_e10858_writel(0, clk->reg, clk->state);  in imx_clk_lpcg_scu_resume()
182 	dev_dbg(dev, "restore lpcg state 0x%x\n", clk->state);  in imx_clk_lpcg_scu_resume()