1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2005-2008, 2015 Texas Instruments, Inc.
6  * Copyright (C) 2004-2010 Nokia Corporation
9  * Richard Woodruff <r-woodruff2@ti.com>
11  * Tero Kristo <t-kristo@ti.com>
16 #include <linux/clk-provider.h>
19 #include <linux/delay.h>
24  * MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
25  * for a module to indicate that it is no longer in idle
37  * _wait_idlest_generic - wait for a module to leave the idle state
38  * @clk: module clock to wait for (needed for register offsets)
41  * @idlest: idle state indicator (0 or 1) for the clock
44  * Wait for a module to leave idle, where its idle-status register is
45  * not inside the CM module.  Returns 1 if the module left idle
46  * promptly, or 0 if the module did not leave idle before the timeout
47  * elapsed.  XXX Deprecated - should be moved into drivers for the
58 	/* Wait until module enters enabled state */  in _wait_idlest_generic()
60 		if ((ti_clk_ll_ops->clk_readl(reg) & mask) == ena)  in _wait_idlest_generic()
76  * _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
80  * corresponds to clock @clk are enabled, then wait for the module to
81  * indicate readiness (i.e., to leave IDLE).  This code does not
83  * module-dependent code.  No return value.
93 	if (clk->ops->find_companion) {  in _omap2_module_wait_ready()
94 		clk->ops->find_companion(clk, &companion_reg, &other_bit);  in _omap2_module_wait_ready()
95 		if (!(ti_clk_ll_ops->clk_readl(&companion_reg) &  in _omap2_module_wait_ready()
100 	clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);  in _omap2_module_wait_ready()
101 	r = ti_clk_ll_ops->cm_split_idlest_reg(&idlest_reg, &prcm_mod,  in _omap2_module_wait_ready()
106 				     idlest_val, clk_hw_get_name(&clk->hw));  in _omap2_module_wait_ready()
108 		ti_clk_ll_ops->cm_wait_module_ready(0, prcm_mod, idlest_reg_id,  in _omap2_module_wait_ready()
114  * omap2_clk_dflt_find_companion - find companion clock to @clk
123  * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes it's
131  * associate this type of code with per-module data structures to
138 	memcpy(other_reg, &clk->enable_reg, sizeof(*other_reg));  in omap2_clk_dflt_find_companion()
141 	 * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes  in omap2_clk_dflt_find_companion()
144 	other_reg->offset ^= (CM_FCLKEN ^ CM_ICLKEN);  in omap2_clk_dflt_find_companion()
146 	*other_bit = clk->enable_bit;  in omap2_clk_dflt_find_companion()
150  * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
154  * @idlest_val: u8 * to return the idle status indicator
167 	memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));  in omap2_clk_dflt_find_idlest()
169 	idlest_reg->offset &= ~0xf0;  in omap2_clk_dflt_find_idlest()
170 	idlest_reg->offset |= 0x20;  in omap2_clk_dflt_find_idlest()
172 	*idlest_bit = clk->enable_bit;  in omap2_clk_dflt_find_idlest()
179 	*idlest_val = ti_clk_get_features()->cm_idlest_val;  in omap2_clk_dflt_find_idlest()
183  * omap2_dflt_clk_enable - enable a clock in the hardware
189  * hardware to enable the clock.  Then wait for the IP block that uses
190  * this clock to leave idle (if applicable).  Returns the error value
191  * from clkdm_clk_enable() if it terminated with an error, or -EINVAL
201 	if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL)  in omap2_dflt_clk_enable()
208 	if (clkdm_control && clk->clkdm) {  in omap2_dflt_clk_enable()
209 		ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);  in omap2_dflt_clk_enable()
214 			     clk->clkdm_name, ret);  in omap2_dflt_clk_enable()
220 	v = ti_clk_ll_ops->clk_readl(&clk->enable_reg);  in omap2_dflt_clk_enable()
221 	if (clk->flags & INVERT_ENABLE)  in omap2_dflt_clk_enable()
222 		v &= ~(1 << clk->enable_bit);  in omap2_dflt_clk_enable()
224 		v |= (1 << clk->enable_bit);  in omap2_dflt_clk_enable()
225 	ti_clk_ll_ops->clk_writel(v, &clk->enable_reg);  in omap2_dflt_clk_enable()
226 	v = ti_clk_ll_ops->clk_readl(&clk->enable_reg); /* OCP barrier */  in omap2_dflt_clk_enable()
228 	if (clk->ops && clk->ops->find_idlest)  in omap2_dflt_clk_enable()
235  * omap2_dflt_clk_disable - disable a clock in the hardware
250 	v = ti_clk_ll_ops->clk_readl(&clk->enable_reg);  in omap2_dflt_clk_disable()
251 	if (clk->flags & INVERT_ENABLE)  in omap2_dflt_clk_disable()
252 		v |= (1 << clk->enable_bit);  in omap2_dflt_clk_disable()
254 		v &= ~(1 << clk->enable_bit);  in omap2_dflt_clk_disable()
255 	ti_clk_ll_ops->clk_writel(v, &clk->enable_reg);  in omap2_dflt_clk_disable()
258 	if (!(ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) &&  in omap2_dflt_clk_disable()
259 	    clk->clkdm)  in omap2_dflt_clk_disable()
260 		ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk);  in omap2_dflt_clk_disable()
264  * omap2_dflt_clk_is_enabled - is clock enabled in the hardware?
276 	v = ti_clk_ll_ops->clk_readl(&clk->enable_reg);  in omap2_dflt_clk_is_enabled()
278 	if (clk->flags & INVERT_ENABLE)  in omap2_dflt_clk_is_enabled()
279 		v ^= BIT(clk->enable_bit);  in omap2_dflt_clk_is_enabled()
281 	v &= BIT(clk->enable_bit);  in omap2_dflt_clk_is_enabled()