1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI clock autoidle support
7  * Tero Kristo <t-kristo@ti.com>
10 #include <linux/clk-provider.h>
21 	u8			shift;  member
32  * we have some non-atomic read/write
34  * take one lock for handling autoidle
41 	if (clk->ops && clk->ops->deny_idle) {  in _omap2_clk_deny_idle()
45 		clk->autoidle_count++;  in _omap2_clk_deny_idle()
46 		if (clk->autoidle_count == 1)  in _omap2_clk_deny_idle()
47 			clk->ops->deny_idle(clk);  in _omap2_clk_deny_idle()
56 	if (clk->ops && clk->ops->allow_idle) {  in _omap2_clk_allow_idle()
60 		clk->autoidle_count--;  in _omap2_clk_allow_idle()
61 		if (clk->autoidle_count == 0)  in _omap2_clk_allow_idle()
62 			clk->ops->allow_idle(clk);  in _omap2_clk_allow_idle()
70  * omap2_clk_deny_idle - disable autoidle on an OMAP clock
71  * @clk: struct clk * to disable autoidle for
73  * Disable autoidle on an OMAP clock.
80 		return -EINVAL;  in omap2_clk_deny_idle()
90 	return -EINVAL;  in omap2_clk_deny_idle()
94  * omap2_clk_allow_idle - enable autoidle on an OMAP clock
95  * @clk: struct clk * to enable autoidle for
97  * Enable autoidle on an OMAP clock.
104 		return -EINVAL;  in omap2_clk_allow_idle()
114 	return -EINVAL;  in omap2_clk_allow_idle()
121 	val = ti_clk_ll_ops->clk_readl(&clk->reg);  in _allow_autoidle()
123 	if (clk->flags & AUTOIDLE_LOW)  in _allow_autoidle()
124 		val &= ~(1 << clk->shift);  in _allow_autoidle()
126 		val |= (1 << clk->shift);  in _allow_autoidle()
128 	ti_clk_ll_ops->clk_writel(val, &clk->reg);  in _allow_autoidle()
135 	val = ti_clk_ll_ops->clk_readl(&clk->reg);  in _deny_autoidle()
137 	if (clk->flags & AUTOIDLE_LOW)  in _deny_autoidle()
138 		val |= (1 << clk->shift);  in _deny_autoidle()
140 		val &= ~(1 << clk->shift);  in _deny_autoidle()
142 	ti_clk_ll_ops->clk_writel(val, &clk->reg);  in _deny_autoidle()
146  * _clk_generic_allow_autoidle_all - enable autoidle for all clocks
148  * Enables hardware autoidle for all registered DT clocks, which have
160  * _clk_generic_deny_autoidle_all - disable autoidle for all clocks
162  * Disables hardware autoidle for all registered DT clocks, which have
174  * of_ti_clk_autoidle_setup - sets up hardware autoidle for a clock
177  * Checks if a clock has hardware autoidle support or not (check
178  * for presence of 'ti,autoidle-shift' property in the device tree
179  * node) and sets up the hardware autoidle feature for the clock
180  * if available. If autoidle is available, the clock is also added
181  * to the autoidle list for later processing. Returns 0 on success,
186 	u32 shift;  in of_ti_clk_autoidle_setup()  local
190 	/* Check if this clock has autoidle support or not */  in of_ti_clk_autoidle_setup()
191 	if (of_property_read_u32(node, "ti,autoidle-shift", &shift))  in of_ti_clk_autoidle_setup()
197 		return -ENOMEM;  in of_ti_clk_autoidle_setup()
199 	clk->shift = shift;  in of_ti_clk_autoidle_setup()
200 	clk->name = ti_dt_clk_name(node);  in of_ti_clk_autoidle_setup()
201 	ret = ti_clk_get_reg_addr(node, 0, &clk->reg);  in of_ti_clk_autoidle_setup()
207 	if (of_property_read_bool(node, "ti,invert-autoidle-bit"))  in of_ti_clk_autoidle_setup()
208 		clk->flags |= AUTOIDLE_LOW;  in of_ti_clk_autoidle_setup()
210 	list_add(&clk->node, &autoidle_clks);  in of_ti_clk_autoidle_setup()
216  * omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
219  * Enable clock autoidle on all OMAP clocks that have allow_idle
238  * omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
241  * Disable clock autoidle on all OMAP clocks that have allow_idle