2 * Copyright (c) 2014 MediaTek Inc.
3 * Author: James Liao <jamesjj.liao@mediatek.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
16 #include <linux/of_address.h>
18 #include <linux/slab.h>
19 #include <linux/clkdev.h>
20 #include <linux/delay.h>
27 #define CON0_BASE_EN BIT(0)
28 #define CON0_PWR_ON BIT(0)
29 #define CON0_ISO_EN BIT(1)
30 #define CON0_PCW_CHG BIT(31)
32 #define AUDPLL_TUNER_EN BIT(31)
34 #define POSTDIV_MASK 0x7
35 #define INTEGER_BITS 7
38 * MediaTek PLLs are configured through their pcw value. The pcw value describes
39 * a divider in the PLL feedback loop which consists of 7 bits for the integer
40 * part and the remaining bits (if present) for the fractional part. Also they
41 * have a 3 bit power-of-two post divider.
46 void __iomem *base_addr;
47 void __iomem *pd_addr;
48 void __iomem *pwr_addr;
49 void __iomem *tuner_addr;
50 void __iomem *pcw_addr;
51 const struct mtk_pll_data *data;
54 static inline struct mtk_clk_pll *to_mtk_clk_pll(struct clk_hw *hw)
56 return container_of(hw, struct mtk_clk_pll, hw);
59 static int mtk_pll_is_prepared(struct clk_hw *hw)
61 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
63 return (readl(pll->base_addr + REG_CON0) & CON0_BASE_EN) != 0;
66 static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
69 int pcwbits = pll->data->pcwbits;
74 /* The fractional part of the PLL divider. */
75 pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
79 if (pcwfbits && (vco & GENMASK(pcwfbits - 1, 0)))
87 return ((unsigned long)vco + postdiv - 1) / postdiv;
90 static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
97 pd = readl(pll->pd_addr);
98 pd &= ~(POSTDIV_MASK << pll->data->pd_shift);
99 pd |= (ffs(postdiv) - 1) << pll->data->pd_shift;
100 writel(pd, pll->pd_addr);
102 pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;
105 val = readl(pll->pcw_addr);
107 val &= ~GENMASK(pll->data->pcw_shift + pll->data->pcwbits - 1,
108 pll->data->pcw_shift);
109 val |= pcw << pll->data->pcw_shift;
110 writel(val, pll->pcw_addr);
112 con1 = readl(pll->base_addr + REG_CON1);
115 con1 |= CON0_PCW_CHG;
117 writel(con1, pll->base_addr + REG_CON1);
119 writel(con1 + 1, pll->tuner_addr);
126 * mtk_pll_calc_values - calculate good values for a given input frequency.
128 * @pcw: The pcw value (output)
129 * @postdiv: The post divider (output)
130 * @freq: The desired target frequency
131 * @fin: The input frequency
134 static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
137 unsigned long fmin = 1000 * MHZ;
141 if (freq > pll->data->fmax)
142 freq = pll->data->fmax;
144 for (val = 0; val < 4; val++) {
146 if (freq * *postdiv >= fmin)
150 /* _pcw = freq * postdiv / fin * 2^pcwfbits */
151 _pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
157 static int mtk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
158 unsigned long parent_rate)
160 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
164 mtk_pll_calc_values(pll, &pcw, &postdiv, rate, parent_rate);
165 mtk_pll_set_rate_regs(pll, pcw, postdiv);
170 static unsigned long mtk_pll_recalc_rate(struct clk_hw *hw,
171 unsigned long parent_rate)
173 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
177 postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
178 postdiv = 1 << postdiv;
180 pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
181 pcw &= GENMASK(pll->data->pcwbits - 1, 0);
183 return __mtk_pll_recalc_rate(pll, parent_rate, pcw, postdiv);
186 static long mtk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
187 unsigned long *prate)
189 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
193 mtk_pll_calc_values(pll, &pcw, &postdiv, rate, *prate);
195 return __mtk_pll_recalc_rate(pll, *prate, pcw, postdiv);
198 static int mtk_pll_prepare(struct clk_hw *hw)
200 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
203 r = readl(pll->pwr_addr) | CON0_PWR_ON;
204 writel(r, pll->pwr_addr);
207 r = readl(pll->pwr_addr) & ~CON0_ISO_EN;
208 writel(r, pll->pwr_addr);
211 r = readl(pll->base_addr + REG_CON0);
212 r |= pll->data->en_mask;
213 writel(r, pll->base_addr + REG_CON0);
215 if (pll->tuner_addr) {
216 r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
217 writel(r, pll->tuner_addr);
222 if (pll->data->flags & HAVE_RST_BAR) {
223 r = readl(pll->base_addr + REG_CON0);
224 r |= pll->data->rst_bar_mask;
225 writel(r, pll->base_addr + REG_CON0);
231 static void mtk_pll_unprepare(struct clk_hw *hw)
233 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
236 if (pll->data->flags & HAVE_RST_BAR) {
237 r = readl(pll->base_addr + REG_CON0);
238 r &= ~pll->data->rst_bar_mask;
239 writel(r, pll->base_addr + REG_CON0);
242 if (pll->tuner_addr) {
243 r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
244 writel(r, pll->tuner_addr);
247 r = readl(pll->base_addr + REG_CON0);
249 writel(r, pll->base_addr + REG_CON0);
251 r = readl(pll->pwr_addr) | CON0_ISO_EN;
252 writel(r, pll->pwr_addr);
254 r = readl(pll->pwr_addr) & ~CON0_PWR_ON;
255 writel(r, pll->pwr_addr);
258 static const struct clk_ops mtk_pll_ops = {
259 .is_prepared = mtk_pll_is_prepared,
260 .prepare = mtk_pll_prepare,
261 .unprepare = mtk_pll_unprepare,
262 .recalc_rate = mtk_pll_recalc_rate,
263 .round_rate = mtk_pll_round_rate,
264 .set_rate = mtk_pll_set_rate,
267 static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
270 struct mtk_clk_pll *pll;
271 struct clk_init_data init = {};
273 const char *parent_name = "clk26m";
275 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
277 return ERR_PTR(-ENOMEM);
279 pll->base_addr = base + data->reg;
280 pll->pwr_addr = base + data->pwr_reg;
281 pll->pd_addr = base + data->pd_reg;
282 pll->pcw_addr = base + data->pcw_reg;
284 pll->tuner_addr = base + data->tuner_reg;
285 pll->hw.init = &init;
288 init.name = data->name;
289 init.ops = &mtk_pll_ops;
290 init.parent_names = &parent_name;
291 init.num_parents = 1;
293 clk = clk_register(NULL, &pll->hw);
301 void __init mtk_clk_register_plls(struct device_node *node,
302 const struct mtk_pll_data *plls, int num_plls, struct clk_onecell_data *clk_data)
308 base = of_iomap(node, 0);
310 pr_err("%s(): ioremap failed\n", __func__);
314 for (i = 0; i < num_plls; i++) {
315 const struct mtk_pll_data *pll = &plls[i];
317 clk = mtk_clk_register_pll(pll, base);
320 pr_err("Failed to register clk %s: %ld\n",
321 pll->name, PTR_ERR(clk));
325 clk_data->clks[pll->id] = clk;
328 r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
330 pr_err("%s(): could not register clock provider: %d\n",