Merge git://git.denx.de/u-boot-fsl-qoriq
[oweals/u-boot.git] / drivers / clk / rockchip / clk_rk322x.c
1 /*
2  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
3  *
4  * SPDX-License-Identifier:     GPL-2.0
5  */
6
7 #include <common.h>
8 #include <clk-uclass.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <syscon.h>
12 #include <asm/io.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/cru_rk322x.h>
15 #include <asm/arch/hardware.h>
16 #include <dm/lists.h>
17 #include <dt-bindings/clock/rk3228-cru.h>
18 #include <linux/log2.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
22 enum {
23         VCO_MAX_HZ      = 3200U * 1000000,
24         VCO_MIN_HZ      = 800 * 1000000,
25         OUTPUT_MAX_HZ   = 3200U * 1000000,
26         OUTPUT_MIN_HZ   = 24 * 1000000,
27 };
28
29 #define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))
30
31 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
32         .refdiv = _refdiv,\
33         .fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ), \
34         .postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
35         _Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) * \
36                          OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz, \
37                          #hz "Hz cannot be hit with PLL "\
38                          "divisors on line " __stringify(__LINE__));
39
40 /* use integer mode*/
41 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
42 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
43
44 static int rkclk_set_pll(struct rk322x_cru *cru, enum rk_clk_id clk_id,
45                          const struct pll_div *div)
46 {
47         int pll_id = rk_pll_id(clk_id);
48         struct rk322x_pll *pll = &cru->pll[pll_id];
49
50         /* All PLLs have same VCO and output frequency range restrictions. */
51         uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
52         uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
53
54         debug("PLL at %p: fb=%d, ref=%d, pst1=%d, pst2=%d, vco=%u Hz, output=%u Hz\n",
55               pll, div->fbdiv, div->refdiv, div->postdiv1,
56               div->postdiv2, vco_hz, output_hz);
57         assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
58                output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
59
60         /* use integer mode */
61         rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
62         /* Power down */
63         rk_setreg(&pll->con1, 1 << PLL_PD_SHIFT);
64
65         rk_clrsetreg(&pll->con0,
66                      PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
67                      (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
68         rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
69                      (div->postdiv2 << PLL_POSTDIV2_SHIFT |
70                      div->refdiv << PLL_REFDIV_SHIFT));
71
72         /* Power Up */
73         rk_clrreg(&pll->con1, 1 << PLL_PD_SHIFT);
74
75         /* waiting for pll lock */
76         while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
77                 udelay(1);
78
79         return 0;
80 }
81
82 static void rkclk_init(struct rk322x_cru *cru)
83 {
84         u32 aclk_div;
85         u32 hclk_div;
86         u32 pclk_div;
87
88         /* pll enter slow-mode */
89         rk_clrsetreg(&cru->cru_mode_con,
90                      GPLL_MODE_MASK | APLL_MODE_MASK,
91                      GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
92                      APLL_MODE_SLOW << APLL_MODE_SHIFT);
93
94         /* init pll */
95         rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
96         rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
97
98         /*
99          * select apll as cpu/core clock pll source and
100          * set up dependent divisors for PERI and ACLK clocks.
101          * core hz : apll = 1:1
102          */
103         aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
104         assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
105
106         pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
107         assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
108
109         rk_clrsetreg(&cru->cru_clksel_con[0],
110                      CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
111                      CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
112                      0 << CORE_DIV_CON_SHIFT);
113
114         rk_clrsetreg(&cru->cru_clksel_con[1],
115                      CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
116                      aclk_div << CORE_ACLK_DIV_SHIFT |
117                      pclk_div << CORE_PERI_DIV_SHIFT);
118
119         /*
120          * select gpll as pd_bus bus clock source and
121          * set up dependent divisors for PCLK/HCLK and ACLK clocks.
122          */
123         aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
124         assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
125
126         pclk_div = BUS_ACLK_HZ / BUS_PCLK_HZ - 1;
127         assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
128
129         hclk_div = BUS_ACLK_HZ / BUS_HCLK_HZ - 1;
130         assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
131
132         rk_clrsetreg(&cru->cru_clksel_con[0],
133                      BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
134                      BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
135                      aclk_div << BUS_ACLK_DIV_SHIFT);
136
137         rk_clrsetreg(&cru->cru_clksel_con[1],
138                      BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
139                      pclk_div << BUS_PCLK_DIV_SHIFT |
140                      hclk_div << BUS_HCLK_DIV_SHIFT);
141
142         /*
143          * select gpll as pd_peri bus clock source and
144          * set up dependent divisors for PCLK/HCLK and ACLK clocks.
145          */
146         aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
147         assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
148
149         hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
150         assert((1 << hclk_div) * PERI_HCLK_HZ ==
151                 PERI_ACLK_HZ && (hclk_div < 0x4));
152
153         pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
154         assert((1 << pclk_div) * PERI_PCLK_HZ ==
155                 PERI_ACLK_HZ && pclk_div < 0x8);
156
157         rk_clrsetreg(&cru->cru_clksel_con[10],
158                      PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
159                      PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
160                      PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
161                      pclk_div << PERI_PCLK_DIV_SHIFT |
162                      hclk_div << PERI_HCLK_DIV_SHIFT |
163                      aclk_div << PERI_ACLK_DIV_SHIFT);
164
165         /* PLL enter normal-mode */
166         rk_clrsetreg(&cru->cru_mode_con,
167                      GPLL_MODE_MASK | APLL_MODE_MASK,
168                      GPLL_MODE_NORM << GPLL_MODE_SHIFT |
169                      APLL_MODE_NORM << APLL_MODE_SHIFT);
170 }
171
172 /* Get pll rate by id */
173 static uint32_t rkclk_pll_get_rate(struct rk322x_cru *cru,
174                                    enum rk_clk_id clk_id)
175 {
176         uint32_t refdiv, fbdiv, postdiv1, postdiv2;
177         uint32_t con;
178         int pll_id = rk_pll_id(clk_id);
179         struct rk322x_pll *pll = &cru->pll[pll_id];
180         static u8 clk_shift[CLK_COUNT] = {
181                 0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
182                 GPLL_MODE_SHIFT, 0xff
183         };
184         static u32 clk_mask[CLK_COUNT] = {
185                 0xff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xff,
186                 GPLL_MODE_MASK, 0xff
187         };
188         uint shift;
189         uint mask;
190
191         con = readl(&cru->cru_mode_con);
192         shift = clk_shift[clk_id];
193         mask = clk_mask[clk_id];
194
195         switch ((con & mask) >> shift) {
196         case GPLL_MODE_SLOW:
197                 return OSC_HZ;
198         case GPLL_MODE_NORM:
199
200                 /* normal mode */
201                 con = readl(&pll->con0);
202                 postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
203                 fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
204                 con = readl(&pll->con1);
205                 postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
206                 refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
207                 return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
208         default:
209                 return 32768;
210         }
211 }
212
213 static ulong rockchip_mmc_get_clk(struct rk322x_cru *cru, uint clk_general_rate,
214                                   int periph)
215 {
216         uint src_rate;
217         uint div, mux;
218         u32 con;
219
220         switch (periph) {
221         case HCLK_EMMC:
222         case SCLK_EMMC:
223                 con = readl(&cru->cru_clksel_con[11]);
224                 mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
225                 con = readl(&cru->cru_clksel_con[12]);
226                 div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
227                 break;
228         case HCLK_SDMMC:
229         case SCLK_SDMMC:
230                 con = readl(&cru->cru_clksel_con[11]);
231                 mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
232                 div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
233                 break;
234         default:
235                 return -EINVAL;
236         }
237
238         src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
239         return DIV_TO_RATE(src_rate, div) / 2;
240 }
241
242 static ulong rockchip_mmc_set_clk(struct rk322x_cru *cru, uint clk_general_rate,
243                                   int periph, uint freq)
244 {
245         int src_clk_div;
246         int mux;
247
248         debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
249
250         /* mmc clock defaulg div 2 internal, need provide double in cru */
251         src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
252
253         if (src_clk_div > 128) {
254                 src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
255                 assert(src_clk_div - 1 < 128);
256                 mux = EMMC_SEL_24M;
257         } else {
258                 mux = EMMC_SEL_GPLL;
259         }
260
261         switch (periph) {
262         case HCLK_EMMC:
263         case SCLK_EMMC:
264                 rk_clrsetreg(&cru->cru_clksel_con[11],
265                              EMMC_PLL_MASK,
266                              mux << EMMC_PLL_SHIFT);
267                 rk_clrsetreg(&cru->cru_clksel_con[12],
268                              EMMC_DIV_MASK,
269                              (src_clk_div - 1) << EMMC_DIV_SHIFT);
270                 break;
271         case HCLK_SDMMC:
272         case SCLK_SDMMC:
273                 rk_clrsetreg(&cru->cru_clksel_con[11],
274                              MMC0_PLL_MASK | MMC0_DIV_MASK,
275                              mux << MMC0_PLL_SHIFT |
276                              (src_clk_div - 1) << MMC0_DIV_SHIFT);
277                 break;
278         default:
279                 return -EINVAL;
280         }
281
282         return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
283 }
284
285 static int rk322x_ddr_set_clk(struct rk322x_cru *cru, unsigned int set_rate)
286 {
287         struct pll_div dpll_cfg;
288
289         /*  clk_ddrc == DPLL = 24MHz / refdiv * fbdiv / postdiv1 / postdiv2 */
290         switch (set_rate) {
291         case 400*MHz:
292                 dpll_cfg = (struct pll_div)
293                 {.refdiv = 1, .fbdiv = 50, .postdiv1 = 3, .postdiv2 = 1};
294                 break;
295         case 600*MHz:
296                 dpll_cfg = (struct pll_div)
297                 {.refdiv = 1, .fbdiv = 75, .postdiv1 = 3, .postdiv2 = 1};
298                 break;
299         case 800*MHz:
300                 dpll_cfg = (struct pll_div)
301                 {.refdiv = 1, .fbdiv = 100, .postdiv1 = 3, .postdiv2 = 1};
302                 break;
303         }
304
305         /* pll enter slow-mode */
306         rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
307                      DPLL_MODE_SLOW << DPLL_MODE_SHIFT);
308         rkclk_set_pll(cru, CLK_DDR, &dpll_cfg);
309         /* PLL enter normal-mode */
310         rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
311                      DPLL_MODE_NORM << DPLL_MODE_SHIFT);
312
313         return set_rate;
314 }
315 static ulong rk322x_clk_get_rate(struct clk *clk)
316 {
317         struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
318         ulong rate, gclk_rate;
319
320         gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
321         switch (clk->id) {
322         case 0 ... 63:
323                 rate = rkclk_pll_get_rate(priv->cru, clk->id);
324                 break;
325         case HCLK_EMMC:
326         case SCLK_EMMC:
327         case HCLK_SDMMC:
328         case SCLK_SDMMC:
329                 rate = rockchip_mmc_get_clk(priv->cru, gclk_rate, clk->id);
330                 break;
331         default:
332                 return -ENOENT;
333         }
334
335         return rate;
336 }
337
338 static ulong rk322x_clk_set_rate(struct clk *clk, ulong rate)
339 {
340         struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
341         ulong new_rate, gclk_rate;
342
343         gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
344         switch (clk->id) {
345         case HCLK_EMMC:
346         case SCLK_EMMC:
347         case HCLK_SDMMC:
348         case SCLK_SDMMC:
349                 new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
350                                                 clk->id, rate);
351                 break;
352         case CLK_DDR:
353                 new_rate = rk322x_ddr_set_clk(priv->cru, rate);
354                 break;
355         default:
356                 return -ENOENT;
357         }
358
359         return new_rate;
360 }
361
362 static struct clk_ops rk322x_clk_ops = {
363         .get_rate       = rk322x_clk_get_rate,
364         .set_rate       = rk322x_clk_set_rate,
365 };
366
367 static int rk322x_clk_ofdata_to_platdata(struct udevice *dev)
368 {
369         struct rk322x_clk_priv *priv = dev_get_priv(dev);
370
371         priv->cru = (struct rk322x_cru *)devfdt_get_addr(dev);
372
373         return 0;
374 }
375
376 static int rk322x_clk_probe(struct udevice *dev)
377 {
378         struct rk322x_clk_priv *priv = dev_get_priv(dev);
379
380         rkclk_init(priv->cru);
381
382         return 0;
383 }
384
385 static int rk322x_clk_bind(struct udevice *dev)
386 {
387         int ret;
388         struct udevice *sys_child;
389         struct sysreset_reg *priv;
390
391         /* The reset driver does not have a device node, so bind it here */
392         ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
393                                  &sys_child);
394         if (ret) {
395                 debug("Warning: No sysreset driver: ret=%d\n", ret);
396         } else {
397                 priv = malloc(sizeof(struct sysreset_reg));
398                 priv->glb_srst_fst_value = offsetof(struct rk322x_cru,
399                                                     cru_glb_srst_fst_value);
400                 priv->glb_srst_snd_value = offsetof(struct rk322x_cru,
401                                                     cru_glb_srst_snd_value);
402                 sys_child->priv = priv;
403         }
404
405 #if CONFIG_IS_ENABLED(CONFIG_RESET_ROCKCHIP)
406         ret = offsetof(struct rk322x_cru, cru_softrst_con[0]);
407         ret = rockchip_reset_bind(dev, ret, 9);
408         if (ret)
409                 debug("Warning: software reset driver bind faile\n");
410 #endif
411
412         return 0;
413 }
414
415 static const struct udevice_id rk322x_clk_ids[] = {
416         { .compatible = "rockchip,rk3228-cru" },
417         { }
418 };
419
420 U_BOOT_DRIVER(rockchip_rk322x_cru) = {
421         .name           = "clk_rk322x",
422         .id             = UCLASS_CLK,
423         .of_match       = rk322x_clk_ids,
424         .priv_auto_alloc_size = sizeof(struct rk322x_clk_priv),
425         .ofdata_to_platdata = rk322x_clk_ofdata_to_platdata,
426         .ops            = &rk322x_clk_ops,
427         .bind           = rk322x_clk_bind,
428         .probe          = rk322x_clk_probe,
429 };