1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014 MediaTek Inc.
4 * Author: James Liao <jamesjj.liao@mediatek.com>
7 #include <linux/clk-provider.h>
8 #include <linux/container_of.h>
9 #include <linux/delay.h>
10 #include <linux/err.h>
12 #include <linux/module.h>
13 #include <linux/of_address.h>
14 #include <linux/slab.h>
18 #define MHZ (1000 * 1000)
23 #define CON0_BASE_EN BIT(0)
24 #define CON0_PWR_ON BIT(0)
25 #define CON0_ISO_EN BIT(1)
26 #define PCW_CHG_MASK BIT(31)
28 #define AUDPLL_TUNER_EN BIT(31)
30 #define POSTDIV_MASK 0x7
32 /* default 7 bits integer, can be overridden with pcwibits. */
33 #define INTEGER_BITS 7
36 * MediaTek PLLs are configured through their pcw value. The pcw value describes
37 * a divider in the PLL feedback loop which consists of 7 bits for the integer
38 * part and the remaining bits (if present) for the fractional part. Also they
39 * have a 3 bit power-of-two post divider.
44 void __iomem *base_addr;
45 void __iomem *pd_addr;
46 void __iomem *pwr_addr;
47 void __iomem *tuner_addr;
48 void __iomem *tuner_en_addr;
49 void __iomem *pcw_addr;
50 void __iomem *pcw_chg_addr;
51 void __iomem *en_addr;
52 const struct mtk_pll_data *data;
55 static inline struct mtk_clk_pll *to_mtk_clk_pll(struct clk_hw *hw)
57 return container_of(hw, struct mtk_clk_pll, hw);
60 static int mtk_pll_is_prepared(struct clk_hw *hw)
62 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
64 return (readl(pll->en_addr) & BIT(pll->data->pll_en_bit)) != 0;
67 static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
70 int pcwbits = pll->data->pcwbits;
76 /* The fractional part of the PLL divider. */
77 ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
79 pcwfbits = pcwbits - ibits;
83 if (pcwfbits && (vco & GENMASK(pcwfbits - 1, 0)))
91 return ((unsigned long)vco + postdiv - 1) / postdiv;
94 static void __mtk_pll_tuner_enable(struct mtk_clk_pll *pll)
98 if (pll->tuner_en_addr) {
99 r = readl(pll->tuner_en_addr) | BIT(pll->data->tuner_en_bit);
100 writel(r, pll->tuner_en_addr);
101 } else if (pll->tuner_addr) {
102 r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
103 writel(r, pll->tuner_addr);
107 static void __mtk_pll_tuner_disable(struct mtk_clk_pll *pll)
111 if (pll->tuner_en_addr) {
112 r = readl(pll->tuner_en_addr) & ~BIT(pll->data->tuner_en_bit);
113 writel(r, pll->tuner_en_addr);
114 } else if (pll->tuner_addr) {
115 r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
116 writel(r, pll->tuner_addr);
120 static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
126 __mtk_pll_tuner_disable(pll);
129 val = readl(pll->pd_addr);
130 val &= ~(POSTDIV_MASK << pll->data->pd_shift);
131 val |= (ffs(postdiv) - 1) << pll->data->pd_shift;
133 /* postdiv and pcw need to set at the same time if on same register */
134 if (pll->pd_addr != pll->pcw_addr) {
135 writel(val, pll->pd_addr);
136 val = readl(pll->pcw_addr);
140 val &= ~GENMASK(pll->data->pcw_shift + pll->data->pcwbits - 1,
141 pll->data->pcw_shift);
142 val |= pcw << pll->data->pcw_shift;
143 writel(val, pll->pcw_addr);
144 chg = readl(pll->pcw_chg_addr) | PCW_CHG_MASK;
145 writel(chg, pll->pcw_chg_addr);
147 writel(val + 1, pll->tuner_addr);
149 /* restore tuner_en */
150 __mtk_pll_tuner_enable(pll);
156 * mtk_pll_calc_values - calculate good values for a given input frequency.
158 * @pcw: The pcw value (output)
159 * @postdiv: The post divider (output)
160 * @freq: The desired target frequency
161 * @fin: The input frequency
164 static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
167 unsigned long fmin = pll->data->fmin ? pll->data->fmin : (1000 * MHZ);
168 const struct mtk_pll_div_table *div_table = pll->data->div_table;
173 if (freq > pll->data->fmax)
174 freq = pll->data->fmax;
177 if (freq > div_table[0].freq)
178 freq = div_table[0].freq;
180 for (val = 0; div_table[val + 1].freq != 0; val++) {
181 if (freq > div_table[val + 1].freq)
186 for (val = 0; val < 5; val++) {
188 if ((u64)freq * *postdiv >= fmin)
193 /* _pcw = freq * postdiv / fin * 2^pcwfbits */
194 ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
195 _pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
201 static int mtk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
202 unsigned long parent_rate)
204 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
208 mtk_pll_calc_values(pll, &pcw, &postdiv, rate, parent_rate);
209 mtk_pll_set_rate_regs(pll, pcw, postdiv);
214 static unsigned long mtk_pll_recalc_rate(struct clk_hw *hw,
215 unsigned long parent_rate)
217 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
221 postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
222 postdiv = 1 << postdiv;
224 pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
225 pcw &= GENMASK(pll->data->pcwbits - 1, 0);
227 return __mtk_pll_recalc_rate(pll, parent_rate, pcw, postdiv);
230 static long mtk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
231 unsigned long *prate)
233 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
237 mtk_pll_calc_values(pll, &pcw, &postdiv, rate, *prate);
239 return __mtk_pll_recalc_rate(pll, *prate, pcw, postdiv);
242 static int mtk_pll_prepare(struct clk_hw *hw)
244 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
248 r = readl(pll->pwr_addr) | CON0_PWR_ON;
249 writel(r, pll->pwr_addr);
252 r = readl(pll->pwr_addr) & ~CON0_ISO_EN;
253 writel(r, pll->pwr_addr);
256 r = readl(pll->en_addr) | BIT(pll->data->pll_en_bit);
257 writel(r, pll->en_addr);
259 div_en_mask = pll->data->en_mask & ~CON0_BASE_EN;
261 r = readl(pll->base_addr + REG_CON0) | div_en_mask;
262 writel(r, pll->base_addr + REG_CON0);
265 __mtk_pll_tuner_enable(pll);
269 if (pll->data->flags & HAVE_RST_BAR) {
270 r = readl(pll->base_addr + REG_CON0);
271 r |= pll->data->rst_bar_mask;
272 writel(r, pll->base_addr + REG_CON0);
278 static void mtk_pll_unprepare(struct clk_hw *hw)
280 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
284 if (pll->data->flags & HAVE_RST_BAR) {
285 r = readl(pll->base_addr + REG_CON0);
286 r &= ~pll->data->rst_bar_mask;
287 writel(r, pll->base_addr + REG_CON0);
290 __mtk_pll_tuner_disable(pll);
292 div_en_mask = pll->data->en_mask & ~CON0_BASE_EN;
294 r = readl(pll->base_addr + REG_CON0) & ~div_en_mask;
295 writel(r, pll->base_addr + REG_CON0);
298 r = readl(pll->en_addr) & ~BIT(pll->data->pll_en_bit);
299 writel(r, pll->en_addr);
301 r = readl(pll->pwr_addr) | CON0_ISO_EN;
302 writel(r, pll->pwr_addr);
304 r = readl(pll->pwr_addr) & ~CON0_PWR_ON;
305 writel(r, pll->pwr_addr);
308 static const struct clk_ops mtk_pll_ops = {
309 .is_prepared = mtk_pll_is_prepared,
310 .prepare = mtk_pll_prepare,
311 .unprepare = mtk_pll_unprepare,
312 .recalc_rate = mtk_pll_recalc_rate,
313 .round_rate = mtk_pll_round_rate,
314 .set_rate = mtk_pll_set_rate,
317 static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
320 struct mtk_clk_pll *pll;
321 struct clk_init_data init = {};
323 const char *parent_name = "clk26m";
325 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
327 return ERR_PTR(-ENOMEM);
329 pll->base_addr = base + data->reg;
330 pll->pwr_addr = base + data->pwr_reg;
331 pll->pd_addr = base + data->pd_reg;
332 pll->pcw_addr = base + data->pcw_reg;
333 if (data->pcw_chg_reg)
334 pll->pcw_chg_addr = base + data->pcw_chg_reg;
336 pll->pcw_chg_addr = pll->base_addr + REG_CON1;
338 pll->tuner_addr = base + data->tuner_reg;
339 if (data->tuner_en_reg || data->tuner_en_bit)
340 pll->tuner_en_addr = base + data->tuner_en_reg;
342 pll->en_addr = base + data->en_reg;
344 pll->en_addr = pll->base_addr + REG_CON0;
345 pll->hw.init = &init;
348 init.name = data->name;
349 init.flags = (data->flags & PLL_AO) ? CLK_IS_CRITICAL : 0;
350 init.ops = &mtk_pll_ops;
351 if (data->parent_name)
352 init.parent_names = &data->parent_name;
354 init.parent_names = &parent_name;
355 init.num_parents = 1;
357 clk = clk_register(NULL, &pll->hw);
365 static void mtk_clk_unregister_pll(struct clk *clk)
368 struct mtk_clk_pll *pll;
370 hw = __clk_get_hw(clk);
374 pll = to_mtk_clk_pll(hw);
380 int mtk_clk_register_plls(struct device_node *node,
381 const struct mtk_pll_data *plls, int num_plls,
382 struct clk_onecell_data *clk_data)
388 base = of_iomap(node, 0);
390 pr_err("%s(): ioremap failed\n", __func__);
394 for (i = 0; i < num_plls; i++) {
395 const struct mtk_pll_data *pll = &plls[i];
397 if (!IS_ERR_OR_NULL(clk_data->clks[pll->id])) {
398 pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
403 clk = mtk_clk_register_pll(pll, base);
406 pr_err("Failed to register clk %s: %pe\n", pll->name, clk);
410 clk_data->clks[pll->id] = clk;
417 const struct mtk_pll_data *pll = &plls[i];
419 mtk_clk_unregister_pll(clk_data->clks[pll->id]);
420 clk_data->clks[pll->id] = ERR_PTR(-ENOENT);
427 EXPORT_SYMBOL_GPL(mtk_clk_register_plls);
429 static __iomem void *mtk_clk_pll_get_base(struct clk *clk,
430 const struct mtk_pll_data *data)
432 struct clk_hw *hw = __clk_get_hw(clk);
433 struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
435 return pll->base_addr - data->reg;
438 void mtk_clk_unregister_plls(const struct mtk_pll_data *plls, int num_plls,
439 struct clk_onecell_data *clk_data)
441 __iomem void *base = NULL;
447 for (i = num_plls; i > 0; i--) {
448 const struct mtk_pll_data *pll = &plls[i - 1];
450 if (IS_ERR_OR_NULL(clk_data->clks[pll->id]))
454 * This is quite ugly but unfortunately the clks don't have
455 * any device tied to them, so there's no place to store the
456 * pointer to the I/O region base address. We have to fetch
457 * it from one of the registered clks.
459 base = mtk_clk_pll_get_base(clk_data->clks[pll->id], pll);
461 mtk_clk_unregister_pll(clk_data->clks[pll->id]);
462 clk_data->clks[pll->id] = ERR_PTR(-ENOENT);
467 EXPORT_SYMBOL_GPL(mtk_clk_unregister_plls);
469 MODULE_LICENSE("GPL");