1 // SPDX-License-Identifier: GPL-2.0-only
3  * OMAP4-specific DPLL control functions
20  * can supported when using the DPLL low-power mode. Frequencies are
22  * Status, and Low-Power Operation Mode".
34 /* Static rate multiplier for OMAP4 REGM4XEN clocks */
45 	mask = clk->flags & CLOCK_CLKOUTX2 ?  in omap4_dpllmx_allow_gatectrl()
49 	v = ti_clk_ll_ops->clk_readl(&clk->clksel_reg);  in omap4_dpllmx_allow_gatectrl()
52 	ti_clk_ll_ops->clk_writel(v, &clk->clksel_reg);  in omap4_dpllmx_allow_gatectrl()
63 	mask = clk->flags & CLOCK_CLKOUTX2 ?  in omap4_dpllmx_deny_gatectrl()
67 	v = ti_clk_ll_ops->clk_readl(&clk->clksel_reg);  in omap4_dpllmx_deny_gatectrl()
70 	ti_clk_ll_ops->clk_writel(v, &clk->clksel_reg);  in omap4_dpllmx_deny_gatectrl()
79  * omap4_dpll_lpmode_recalc - compute DPLL low-power setting
82  * Calculates if low-power mode can be enabled based upon the last
83  * multiplier and divider values calculated. If low-power mode can be
84  * enabled, then the bit to enable low-power mode is stored in the
86  * criteria for enabling low-power mode as described in the OMAP4430/60
87  * Public TRM section 3.6.3.3.2 "Enable Control, Status, and Low-Power
94 	fint = clk_hw_get_rate(dd->clk_ref) / (dd->last_rounded_n + 1);  in omap4_dpll_lpmode_recalc()
95 	fout = fint * dd->last_rounded_m;  in omap4_dpll_lpmode_recalc()
98 		dd->last_rounded_lpmode = 1;  in omap4_dpll_lpmode_recalc()
100 		dd->last_rounded_lpmode = 0;  in omap4_dpll_lpmode_recalc()
104  * omap4_dpll_regm4xen_recalc - compute DPLL rate, considering REGM4XEN bit
105  * @hw: pointer to the clock to compute the rate for
106  * @parent_rate: clock rate of the DPLL parent
108  * Compute the output rate for the OMAP4 DPLL represented by @clk.
110  * OMAP4 ABE DPLL.  Returns the DPLL's output rate (before M-dividers)
118 	unsigned long rate;  in omap4_dpll_regm4xen_recalc()  local
121 	if (!clk || !clk->dpll_data)  in omap4_dpll_regm4xen_recalc()
124 	dd = clk->dpll_data;  in omap4_dpll_regm4xen_recalc()
126 	rate = omap2_get_dpll_rate(clk);  in omap4_dpll_regm4xen_recalc()
128 	/* regm4xen adds a multiplier of 4 to DPLL calculations */  in omap4_dpll_regm4xen_recalc()
129 	v = ti_clk_ll_ops->clk_readl(&dd->control_reg);  in omap4_dpll_regm4xen_recalc()
131 		rate *= OMAP4430_REGM4XEN_MULT;  in omap4_dpll_regm4xen_recalc()
133 	return rate;  in omap4_dpll_regm4xen_recalc()
137  * omap4_dpll_regm4xen_determine_rate - determine rate for a DPLL
138  * @hw: pointer to the clock to determine rate for
139  * @req: target rate request
141  * Determines which DPLL mode to use for reaching a desired rate.
144  * Returns 0 on success and a negative error value otherwise.
152 	if (!req->rate)  in omap4_dpll_regm4xen_determine_rate()
153 		return -EINVAL;  in omap4_dpll_regm4xen_determine_rate()
155 	dd = clk->dpll_data;  in omap4_dpll_regm4xen_determine_rate()
157 		return -EINVAL;  in omap4_dpll_regm4xen_determine_rate()
159 	if (clk_hw_get_rate(dd->clk_bypass) == req->rate &&  in omap4_dpll_regm4xen_determine_rate()
160 	    (dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {  in omap4_dpll_regm4xen_determine_rate()
161 		req->best_parent_hw = dd->clk_bypass;  in omap4_dpll_regm4xen_determine_rate()
166 		clk_hw_init_rate_request(hw, &tmp_req, req->rate);  in omap4_dpll_regm4xen_determine_rate()
167 		dd->last_rounded_m4xen = 0;  in omap4_dpll_regm4xen_determine_rate()
171 		 * target rate without using the 4X multiplier.  in omap4_dpll_regm4xen_determine_rate()
177 			 * If we did not find a valid DPLL configuration, try again, but  in omap4_dpll_regm4xen_determine_rate()
179 			 * 4X multiplier is equivalent to dividing the target rate by 4.  in omap4_dpll_regm4xen_determine_rate()
181 			tmp_req.rate /= OMAP4430_REGM4XEN_MULT;  in omap4_dpll_regm4xen_determine_rate()
186 			dd->last_rounded_rate *= OMAP4430_REGM4XEN_MULT;  in omap4_dpll_regm4xen_determine_rate()
187 			dd->last_rounded_m4xen = 1;  in omap4_dpll_regm4xen_determine_rate()
192 		req->rate = dd->last_rounded_rate;  in omap4_dpll_regm4xen_determine_rate()
193 		req->best_parent_hw = dd->clk_ref;  in omap4_dpll_regm4xen_determine_rate()
196 	req->best_parent_rate = req->rate;  in omap4_dpll_regm4xen_determine_rate()