1 // SPDX-License-Identifier: GPL-2.0-only
3  * Toshiba Visconti PLL driver
12 #include <linux/clk-provider.h>
17 #include "pll.h"
29 #define PLL_CONF_REG		0x0000
30 #define PLL_CTRL_REG		0x0004
31 #define PLL_FRACMODE_REG	0x0010
32 #define PLL_INTIN_REG		0x0014
33 #define PLL_FRACIN_REG		0x0018
34 #define PLL_REFDIV_REG		0x001c
35 #define PLL_POSTDIV_REG		0x0020
37 #define PLL_CONFIG_SEL		BIT(0)
40 #define PLL_INTIN_MASK		GENMASK(11, 0)
41 #define PLL_FRACIN_MASK		GENMASK(23, 0)
42 #define PLL_REFDIV_MASK		GENMASK(5, 0)
43 #define PLL_POSTDIV_MASK	GENMASK(2, 0)
46 #define PLL0_FRACMODE_DSMEN	BIT(0)
48 #define PLL_CREATE_FRACMODE(table) (table->dacen << 4 | table->dsmen)
49 #define PLL_CREATE_OSTDIV(table) (table->postdiv2 << 4 | table->postdiv1)
56 static void visconti_pll_get_params(struct visconti_pll *pll,  in visconti_pll_get_params()  argument
61 	val = readl(pll->pll_base + PLL_FRACMODE_REG);  in visconti_pll_get_params()
63 	rate_table->dacen = FIELD_GET(PLL0_FRACMODE_DACEN, val);  in visconti_pll_get_params()
64 	rate_table->dsmen = FIELD_GET(PLL0_FRACMODE_DSMEN, val);  in visconti_pll_get_params()
66 	rate_table->fracin = readl(pll->pll_base + PLL_FRACIN_REG) & PLL_FRACIN_MASK;  in visconti_pll_get_params()
67 	rate_table->intin = readl(pll->pll_base + PLL_INTIN_REG) & PLL_INTIN_MASK;  in visconti_pll_get_params()
68 	rate_table->refdiv = readl(pll->pll_base + PLL_REFDIV_REG) & PLL_REFDIV_MASK;  in visconti_pll_get_params()
70 	postdiv = readl(pll->pll_base + PLL_POSTDIV_REG);  in visconti_pll_get_params()
71 	rate_table->postdiv1 = postdiv & PLL_POSTDIV_MASK;  in visconti_pll_get_params()
72 	rate_table->postdiv2 = (postdiv >> 4) & PLL_POSTDIV_MASK;  in visconti_pll_get_params()
75 static const struct visconti_pll_rate_table *visconti_get_pll_settings(struct visconti_pll *pll,  in visconti_get_pll_settings()  argument
78 	const struct visconti_pll_rate_table *rate_table = pll->rate_table;  in visconti_get_pll_settings()
81 	for (i = 0; i < pll->rate_count; i++)  in visconti_get_pll_settings()
88 static unsigned long visconti_get_pll_rate_from_data(struct visconti_pll *pll,  in visconti_get_pll_rate_from_data()  argument
91 	const struct visconti_pll_rate_table *rate_table = pll->rate_table;  in visconti_get_pll_rate_from_data()
94 	for (i = 0; i < pll->rate_count; i++)  in visconti_get_pll_rate_from_data()
95 		if (memcmp(&rate_table[i].dacen, &rate->dacen,  in visconti_get_pll_rate_from_data()
96 			sizeof(*rate) - sizeof(unsigned long)) == 0)  in visconti_get_pll_rate_from_data()
100 	return rate_table[0].rate;  in visconti_get_pll_rate_from_data()
106 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_determine_rate()  local
107 	const struct visconti_pll_rate_table *rate_table = pll->rate_table;  in visconti_pll_determine_rate()
111 	for (i = 0; i < pll->rate_count; i++)  in visconti_pll_determine_rate()
112 		if (req->rate >= rate_table[i].rate) {  in visconti_pll_determine_rate()
113 			req->rate = rate_table[i].rate;  in visconti_pll_determine_rate()
115 			return 0;  in visconti_pll_determine_rate()
119 	req->rate = rate_table[i - 1].rate;  in visconti_pll_determine_rate()
121 	return 0;  in visconti_pll_determine_rate()
127 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_recalc_rate()  local
130 	memset(&rate_table, 0, sizeof(rate_table));  in visconti_pll_recalc_rate()
131 	visconti_pll_get_params(pll, &rate_table);  in visconti_pll_recalc_rate()
133 	return visconti_get_pll_rate_from_data(pll, &rate_table);  in visconti_pll_recalc_rate()
136 static int visconti_pll_set_params(struct visconti_pll *pll,  in visconti_pll_set_params()  argument
139 	writel(PLL_CREATE_FRACMODE(rate_table), pll->pll_base + PLL_FRACMODE_REG);  in visconti_pll_set_params()
140 	writel(PLL_CREATE_OSTDIV(rate_table), pll->pll_base + PLL_POSTDIV_REG);  in visconti_pll_set_params()
141 	writel(rate_table->intin, pll->pll_base + PLL_INTIN_REG);  in visconti_pll_set_params()
142 	writel(rate_table->fracin, pll->pll_base + PLL_FRACIN_REG);  in visconti_pll_set_params()
143 	writel(rate_table->refdiv, pll->pll_base + PLL_REFDIV_REG);  in visconti_pll_set_params()
145 	return 0;  in visconti_pll_set_params()
151 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_set_rate()  local
154 	rate_table = visconti_get_pll_settings(pll, rate);  in visconti_pll_set_rate()
156 		return -EINVAL;  in visconti_pll_set_rate()
158 	return visconti_pll_set_params(pll, rate_table);  in visconti_pll_set_rate()
163 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_is_enabled()  local
166 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_is_enabled()
173 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_enable()  local
174 	const struct visconti_pll_rate_table *rate_table = pll->rate_table;  in visconti_pll_enable()
179 		return 0;  in visconti_pll_enable()
181 	spin_lock_irqsave(pll->lock, flags);  in visconti_pll_enable()
183 	writel(PLL_CONFIG_SEL, pll->pll_base + PLL_CONF_REG);  in visconti_pll_enable()
185 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
187 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
189 	visconti_pll_set_params(pll, &rate_table[0]);  in visconti_pll_enable()
191 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
193 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
197 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
199 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
203 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
205 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_enable()
207 	spin_unlock_irqrestore(pll->lock, flags);  in visconti_pll_enable()
209 	return 0;  in visconti_pll_enable()
214 	struct visconti_pll *pll = to_visconti_pll(hw);  in visconti_pll_disable()  local
221 	spin_lock_irqsave(pll->lock, flags);  in visconti_pll_disable()
223 	writel(PLL_CONFIG_SEL, pll->pll_base + PLL_CONF_REG);  in visconti_pll_disable()
225 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_disable()
227 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_disable()
229 	reg = readl(pll->pll_base + PLL_CTRL_REG);  in visconti_pll_disable()
231 	writel(reg, pll->pll_base + PLL_CTRL_REG);  in visconti_pll_disable()
233 	spin_unlock_irqrestore(pll->lock, flags);  in visconti_pll_disable()
253 	struct visconti_pll *pll;  in visconti_register_pll()  local
258 	pll = kzalloc(sizeof(*pll), GFP_KERNEL);  in visconti_register_pll()
259 	if (!pll)  in visconti_register_pll()
260 		return ERR_PTR(-ENOMEM);  in visconti_register_pll()
267 	for (len = 0; rate_table[len].rate != 0; )  in visconti_register_pll()
269 	pll->rate_count = len;  in visconti_register_pll()
270 	pll->rate_table = kmemdup_array(rate_table,  in visconti_register_pll()
271 					pll->rate_count, sizeof(*pll->rate_table),  in visconti_register_pll()
273 	WARN(!pll->rate_table, "%s: could not allocate rate table for %s\n", __func__, name);  in visconti_register_pll()
276 	pll->hw.init = &init;  in visconti_register_pll()
277 	pll->pll_base = ctx->reg_base + offset;  in visconti_register_pll()
278 	pll->lock = lock;  in visconti_register_pll()
279 	pll->ctx = ctx;  in visconti_register_pll()
281 	pll_hw_clk = &pll->hw;  in visconti_register_pll()
282 	ret = clk_hw_register(NULL, &pll->hw);  in visconti_register_pll()
284 		pr_err("failed to register pll clock %s : %d\n", name, ret);  in visconti_register_pll()
285 		kfree(pll->rate_table);  in visconti_register_pll()
286 		kfree(pll);  in visconti_register_pll()
298 		ctx->clk_data.hws[id] = hw_clk;  in visconti_pll_add_lookup()
308 	for (idx = 0; idx < nr_plls; idx++, list++) {  in visconti_register_plls()
312 					    list->name,  in visconti_register_plls()
313 					    list->parent,  in visconti_register_plls()
314 					    list->base_reg,  in visconti_register_plls()
315 					    list->rate_table,  in visconti_register_plls()
318 			pr_err("failed to register clock %s\n", list->name);  in visconti_register_plls()
322 		visconti_pll_add_lookup(ctx, clk, list->id);  in visconti_register_plls()
335 		return ERR_PTR(-ENOMEM);  in visconti_init_pll()
337 	ctx->node = np;  in visconti_init_pll()
338 	ctx->reg_base = base;  in visconti_init_pll()
339 	ctx->clk_data.num = nr_plls;  in visconti_init_pll()
341 	for (i = 0; i < nr_plls; ++i)  in visconti_init_pll()
342 		ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);  in visconti_init_pll()