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e80dac0a EP |
1 | /* |
2 | * Synopsys HSDK SDP CGU clock driver | |
3 | * | |
4 | * Copyright (C) 2017 Synopsys | |
5 | * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | |
6 | * | |
7 | * This file is licensed under the terms of the GNU General Public | |
8 | * License version 2. This program is licensed "as is" without any | |
9 | * warranty of any kind, whether express or implied. | |
10 | */ | |
11 | ||
12 | #include <common.h> | |
13 | #include <clk-uclass.h> | |
14 | #include <div64.h> | |
15 | #include <dm.h> | |
16 | #include <linux/io.h> | |
17 | ||
18 | /* | |
19 | * Synopsys ARC HSDK clock tree. | |
20 | * | |
21 | * ------------------ | |
22 | * | 33.33 MHz xtal | | |
23 | * ------------------ | |
24 | * | | |
25 | * | ----------- | |
26 | * |-->| ARC PLL | | |
27 | * | ----------- | |
28 | * | | | |
29 | * | |-->|CGU_ARC_IDIV|-----------> | |
30 | * | |-->|CREG_CORE_IF_DIV|-------> | |
31 | * | | |
32 | * | -------------- | |
33 | * |-->| SYSTEM PLL | | |
34 | * | -------------- | |
35 | * | | | |
36 | * | |-->|CGU_SYS_IDIV_APB|-------> | |
37 | * | |-->|CGU_SYS_IDIV_AXI|-------> | |
38 | * | |-->|CGU_SYS_IDIV_*|---------> | |
39 | * | |-->|CGU_SYS_IDIV_EBI_REF|---> | |
40 | * | | |
41 | * | -------------- | |
42 | * |-->| TUNNEL PLL | | |
43 | * | -------------- | |
44 | * | | | |
075cbae1 EP |
45 | * | |-->|CGU_TUN_IDIV_TUN|-----------> |
46 | * | |-->|CGU_TUN_IDIV_ROM|-----------> | |
47 | * | |-->|CGU_TUN_IDIV_PWM|-----------> | |
e80dac0a EP |
48 | * | |
49 | * | ------------ | |
50 | * |-->| HDMI PLL | | |
51 | * | ------------ | |
52 | * | | | |
53 | * | |-->|CGU_HDMI_IDIV_APB|------> | |
54 | * | | |
55 | * | ----------- | |
56 | * |-->| DDR PLL | | |
57 | * ----------- | |
58 | * | | |
59 | * |----------------------------> | |
60 | */ | |
61 | ||
62 | DECLARE_GLOBAL_DATA_PTR; | |
63 | ||
64 | #define CGU_ARC_IDIV 0x080 | |
075cbae1 EP |
65 | #define CGU_TUN_IDIV_TUN 0x380 |
66 | #define CGU_TUN_IDIV_ROM 0x390 | |
67 | #define CGU_TUN_IDIV_PWM 0x3A0 | |
e80dac0a EP |
68 | #define CGU_HDMI_IDIV_APB 0x480 |
69 | #define CGU_SYS_IDIV_APB 0x180 | |
70 | #define CGU_SYS_IDIV_AXI 0x190 | |
71 | #define CGU_SYS_IDIV_ETH 0x1A0 | |
72 | #define CGU_SYS_IDIV_USB 0x1B0 | |
73 | #define CGU_SYS_IDIV_SDIO 0x1C0 | |
74 | #define CGU_SYS_IDIV_HDMI 0x1D0 | |
75 | #define CGU_SYS_IDIV_GFX_CORE 0x1E0 | |
76 | #define CGU_SYS_IDIV_GFX_DMA 0x1F0 | |
77 | #define CGU_SYS_IDIV_GFX_CFG 0x200 | |
78 | #define CGU_SYS_IDIV_DMAC_CORE 0x210 | |
79 | #define CGU_SYS_IDIV_DMAC_CFG 0x220 | |
80 | #define CGU_SYS_IDIV_SDIO_REF 0x230 | |
81 | #define CGU_SYS_IDIV_SPI_REF 0x240 | |
82 | #define CGU_SYS_IDIV_I2C_REF 0x250 | |
83 | #define CGU_SYS_IDIV_UART_REF 0x260 | |
84 | #define CGU_SYS_IDIV_EBI_REF 0x270 | |
85 | ||
86 | #define CGU_IDIV_MASK 0xFF /* All idiv have 8 significant bits */ | |
87 | ||
88 | #define CGU_ARC_PLL 0x0 | |
89 | #define CGU_SYS_PLL 0x10 | |
90 | #define CGU_DDR_PLL 0x20 | |
91 | #define CGU_TUN_PLL 0x30 | |
92 | #define CGU_HDMI_PLL 0x40 | |
93 | ||
94 | #define CGU_PLL_CTRL 0x000 /* ARC PLL control register */ | |
95 | #define CGU_PLL_STATUS 0x004 /* ARC PLL status register */ | |
96 | #define CGU_PLL_FMEAS 0x008 /* ARC PLL frequency measurement register */ | |
97 | #define CGU_PLL_MON 0x00C /* ARC PLL monitor register */ | |
98 | ||
99 | #define CGU_PLL_CTRL_ODIV_SHIFT 2 | |
100 | #define CGU_PLL_CTRL_IDIV_SHIFT 4 | |
101 | #define CGU_PLL_CTRL_FBDIV_SHIFT 9 | |
102 | #define CGU_PLL_CTRL_BAND_SHIFT 20 | |
103 | ||
104 | #define CGU_PLL_CTRL_ODIV_MASK GENMASK(3, CGU_PLL_CTRL_ODIV_SHIFT) | |
105 | #define CGU_PLL_CTRL_IDIV_MASK GENMASK(8, CGU_PLL_CTRL_IDIV_SHIFT) | |
106 | #define CGU_PLL_CTRL_FBDIV_MASK GENMASK(15, CGU_PLL_CTRL_FBDIV_SHIFT) | |
107 | ||
108 | #define CGU_PLL_CTRL_PD BIT(0) | |
109 | #define CGU_PLL_CTRL_BYPASS BIT(1) | |
110 | ||
111 | #define CGU_PLL_STATUS_LOCK BIT(0) | |
112 | #define CGU_PLL_STATUS_ERR BIT(1) | |
113 | ||
114 | #define HSDK_PLL_MAX_LOCK_TIME 100 /* 100 us */ | |
115 | ||
116 | #define CREG_CORE_IF_DIV 0x000 /* ARC CORE interface divider */ | |
117 | #define CORE_IF_CLK_THRESHOLD_HZ 500000000 | |
118 | #define CREG_CORE_IF_CLK_DIV_1 0x0 | |
119 | #define CREG_CORE_IF_CLK_DIV_2 0x1 | |
120 | ||
075cbae1 | 121 | #define MIN_PLL_RATE 100000000 /* 100 MHz */ |
e80dac0a | 122 | #define PARENT_RATE 33333333 /* fixed clock - xtal */ |
075cbae1 EP |
123 | #define CGU_MAX_CLOCKS 26 |
124 | ||
125 | #define CGU_SYS_CLOCKS 16 | |
126 | #define MAX_AXI_CLOCKS 4 | |
127 | ||
128 | #define CGU_TUN_CLOCKS 3 | |
129 | #define MAX_TUN_CLOCKS 6 | |
130 | ||
131 | struct hsdk_tun_idiv_cfg { | |
132 | u32 oft; | |
133 | u8 val[MAX_TUN_CLOCKS]; | |
134 | }; | |
135 | ||
136 | struct hsdk_tun_clk_cfg { | |
137 | const u32 clk_rate[MAX_TUN_CLOCKS]; | |
138 | const u32 pll_rate[MAX_TUN_CLOCKS]; | |
139 | const struct hsdk_tun_idiv_cfg idiv[CGU_TUN_CLOCKS]; | |
140 | }; | |
141 | ||
142 | static const struct hsdk_tun_clk_cfg tun_clk_cfg = { | |
143 | { 25000000, 50000000, 75000000, 100000000, 125000000, 150000000 }, | |
144 | { 600000000, 600000000, 600000000, 600000000, 700000000, 600000000 }, { | |
145 | { CGU_TUN_IDIV_TUN, { 24, 12, 8, 6, 6, 4 } }, | |
146 | { CGU_TUN_IDIV_ROM, { 4, 4, 4, 4, 5, 4 } }, | |
147 | { CGU_TUN_IDIV_PWM, { 8, 8, 8, 8, 10, 8 } } | |
148 | } | |
149 | }; | |
150 | ||
151 | struct hsdk_sys_idiv_cfg { | |
152 | u32 oft; | |
153 | u8 val[MAX_AXI_CLOCKS]; | |
154 | }; | |
155 | ||
156 | struct hsdk_axi_clk_cfg { | |
157 | const u32 clk_rate[MAX_AXI_CLOCKS]; | |
158 | const u32 pll_rate[MAX_AXI_CLOCKS]; | |
159 | const struct hsdk_sys_idiv_cfg idiv[CGU_SYS_CLOCKS]; | |
160 | }; | |
161 | ||
162 | static const struct hsdk_axi_clk_cfg axi_clk_cfg = { | |
163 | { 200000000, 400000000, 600000000, 800000000 }, | |
164 | { 800000000, 800000000, 600000000, 800000000 }, { | |
165 | { CGU_SYS_IDIV_APB, { 4, 4, 3, 4 } }, /* APB */ | |
166 | { CGU_SYS_IDIV_AXI, { 4, 2, 1, 1 } }, /* AXI */ | |
167 | { CGU_SYS_IDIV_ETH, { 2, 2, 2, 2 } }, /* ETH */ | |
168 | { CGU_SYS_IDIV_USB, { 2, 2, 2, 2 } }, /* USB */ | |
169 | { CGU_SYS_IDIV_SDIO, { 2, 2, 2, 2 } }, /* SDIO */ | |
170 | { CGU_SYS_IDIV_HDMI, { 2, 2, 2, 2 } }, /* HDMI */ | |
171 | { CGU_SYS_IDIV_GFX_CORE, { 1, 1, 1, 1 } }, /* GPU-CORE */ | |
172 | { CGU_SYS_IDIV_GFX_DMA, { 2, 2, 2, 2 } }, /* GPU-DMA */ | |
173 | { CGU_SYS_IDIV_GFX_CFG, { 4, 4, 3, 4 } }, /* GPU-CFG */ | |
174 | { CGU_SYS_IDIV_DMAC_CORE,{ 2, 2, 2, 2 } }, /* DMAC-CORE */ | |
175 | { CGU_SYS_IDIV_DMAC_CFG, { 4, 4, 3, 4 } }, /* DMAC-CFG */ | |
176 | { CGU_SYS_IDIV_SDIO_REF, { 8, 8, 6, 8 } }, /* SDIO-REF */ | |
177 | { CGU_SYS_IDIV_SPI_REF, { 24, 24, 18, 24 } }, /* SPI-REF */ | |
178 | { CGU_SYS_IDIV_I2C_REF, { 4, 4, 3, 4 } }, /* I2C-REF */ | |
179 | { CGU_SYS_IDIV_UART_REF, { 24, 24, 18, 24 } }, /* UART-REF */ | |
180 | { CGU_SYS_IDIV_EBI_REF, { 16, 16, 12, 16 } } /* EBI-REF */ | |
181 | } | |
182 | }; | |
e80dac0a EP |
183 | |
184 | struct hsdk_pll_cfg { | |
185 | u32 rate; | |
186 | u32 idiv; | |
187 | u32 fbdiv; | |
188 | u32 odiv; | |
189 | u32 band; | |
190 | }; | |
191 | ||
192 | static const struct hsdk_pll_cfg asdt_pll_cfg[] = { | |
193 | { 100000000, 0, 11, 3, 0 }, | |
194 | { 125000000, 0, 14, 3, 0 }, | |
195 | { 133000000, 0, 15, 3, 0 }, | |
196 | { 150000000, 0, 17, 3, 0 }, | |
197 | { 200000000, 1, 47, 3, 0 }, | |
198 | { 233000000, 1, 27, 2, 0 }, | |
199 | { 300000000, 1, 35, 2, 0 }, | |
200 | { 333000000, 1, 39, 2, 0 }, | |
201 | { 400000000, 1, 47, 2, 0 }, | |
202 | { 500000000, 0, 14, 1, 0 }, | |
203 | { 600000000, 0, 17, 1, 0 }, | |
204 | { 700000000, 0, 20, 1, 0 }, | |
205 | { 800000000, 0, 23, 1, 0 }, | |
206 | { 900000000, 1, 26, 0, 0 }, | |
207 | { 1000000000, 1, 29, 0, 0 }, | |
208 | { 1100000000, 1, 32, 0, 0 }, | |
209 | { 1200000000, 1, 35, 0, 0 }, | |
210 | { 1300000000, 1, 38, 0, 0 }, | |
211 | { 1400000000, 1, 41, 0, 0 }, | |
212 | { 1500000000, 1, 44, 0, 0 }, | |
213 | { 1600000000, 1, 47, 0, 0 }, | |
214 | {} | |
215 | }; | |
216 | ||
217 | static const struct hsdk_pll_cfg hdmi_pll_cfg[] = { | |
218 | { 297000000, 0, 21, 2, 0 }, | |
219 | { 540000000, 0, 19, 1, 0 }, | |
220 | { 594000000, 0, 21, 1, 0 }, | |
221 | {} | |
222 | }; | |
223 | ||
224 | struct hsdk_cgu_clk { | |
225 | /* CGU block register */ | |
226 | void __iomem *cgu_regs; | |
227 | /* CREG block register */ | |
228 | void __iomem *creg_regs; | |
229 | ||
230 | /* PLLs registers */ | |
231 | void __iomem *regs; | |
232 | /* PLLs special registers */ | |
233 | void __iomem *spec_regs; | |
234 | /* PLLs devdata */ | |
235 | const struct hsdk_pll_devdata *pll_devdata; | |
236 | ||
237 | /* Dividers registers */ | |
238 | void __iomem *idiv_regs; | |
239 | }; | |
240 | ||
241 | struct hsdk_pll_devdata { | |
242 | const struct hsdk_pll_cfg *pll_cfg; | |
243 | int (*update_rate)(struct hsdk_cgu_clk *clk, unsigned long rate, | |
244 | const struct hsdk_pll_cfg *cfg); | |
245 | }; | |
246 | ||
247 | static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *, unsigned long, | |
248 | const struct hsdk_pll_cfg *); | |
249 | static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *, unsigned long, | |
250 | const struct hsdk_pll_cfg *); | |
251 | ||
252 | static const struct hsdk_pll_devdata core_pll_dat = { | |
253 | .pll_cfg = asdt_pll_cfg, | |
254 | .update_rate = hsdk_pll_core_update_rate, | |
255 | }; | |
256 | ||
257 | static const struct hsdk_pll_devdata sdt_pll_dat = { | |
258 | .pll_cfg = asdt_pll_cfg, | |
259 | .update_rate = hsdk_pll_comm_update_rate, | |
260 | }; | |
261 | ||
262 | static const struct hsdk_pll_devdata hdmi_pll_dat = { | |
263 | .pll_cfg = hdmi_pll_cfg, | |
264 | .update_rate = hsdk_pll_comm_update_rate, | |
265 | }; | |
266 | ||
267 | static ulong idiv_set(struct clk *, ulong); | |
075cbae1 EP |
268 | static ulong cpu_clk_set(struct clk *, ulong); |
269 | static ulong axi_clk_set(struct clk *, ulong); | |
270 | static ulong tun_clk_set(struct clk *, ulong); | |
e80dac0a EP |
271 | static ulong idiv_get(struct clk *); |
272 | static int idiv_off(struct clk *); | |
273 | static ulong pll_set(struct clk *, ulong); | |
274 | static ulong pll_get(struct clk *); | |
275 | ||
276 | struct hsdk_cgu_clock_map { | |
277 | u32 cgu_pll_oft; | |
278 | u32 creg_div_oft; | |
279 | u32 cgu_div_oft; | |
280 | const struct hsdk_pll_devdata *pll_devdata; | |
281 | ulong (*get_rate)(struct clk *clk); | |
282 | ulong (*set_rate)(struct clk *clk, ulong rate); | |
283 | int (*disable)(struct clk *clk); | |
284 | }; | |
285 | ||
286 | static const struct hsdk_cgu_clock_map clock_map[] = { | |
287 | { CGU_ARC_PLL, 0, 0, &core_pll_dat, pll_get, pll_set, NULL }, | |
075cbae1 | 288 | { CGU_ARC_PLL, 0, CGU_ARC_IDIV, &core_pll_dat, idiv_get, cpu_clk_set, idiv_off }, |
e80dac0a EP |
289 | { CGU_DDR_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, |
290 | { CGU_SYS_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, | |
291 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
075cbae1 | 292 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, axi_clk_set, idiv_off }, |
e80dac0a EP |
293 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, |
294 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
295 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
296 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
297 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
298 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_DMA, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
299 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
300 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
301 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
302 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
303 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
304 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
305 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
306 | { CGU_SYS_PLL, 0, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
307 | { CGU_TUN_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, | |
075cbae1 EP |
308 | { CGU_TUN_PLL, 0, CGU_TUN_IDIV_TUN, &sdt_pll_dat, idiv_get, tun_clk_set, idiv_off }, |
309 | { CGU_TUN_PLL, 0, CGU_TUN_IDIV_ROM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
310 | { CGU_TUN_PLL, 0, CGU_TUN_IDIV_PWM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, | |
e80dac0a EP |
311 | { CGU_HDMI_PLL, 0, 0, &hdmi_pll_dat, pll_get, pll_set, NULL }, |
312 | { CGU_HDMI_PLL, 0, CGU_HDMI_IDIV_APB, &hdmi_pll_dat, idiv_get, idiv_set, idiv_off } | |
313 | }; | |
314 | ||
315 | static inline void hsdk_idiv_write(struct hsdk_cgu_clk *clk, u32 val) | |
316 | { | |
317 | iowrite32(val, clk->idiv_regs); | |
318 | } | |
319 | ||
320 | static inline u32 hsdk_idiv_read(struct hsdk_cgu_clk *clk) | |
321 | { | |
322 | return ioread32(clk->idiv_regs); | |
323 | } | |
324 | ||
325 | static inline void hsdk_pll_write(struct hsdk_cgu_clk *clk, u32 reg, u32 val) | |
326 | { | |
327 | iowrite32(val, clk->regs + reg); | |
328 | } | |
329 | ||
330 | static inline u32 hsdk_pll_read(struct hsdk_cgu_clk *clk, u32 reg) | |
331 | { | |
332 | return ioread32(clk->regs + reg); | |
333 | } | |
334 | ||
335 | static inline void hsdk_pll_spcwrite(struct hsdk_cgu_clk *clk, u32 reg, u32 val) | |
336 | { | |
337 | iowrite32(val, clk->spec_regs + reg); | |
338 | } | |
339 | ||
340 | static inline u32 hsdk_pll_spcread(struct hsdk_cgu_clk *clk, u32 reg) | |
341 | { | |
342 | return ioread32(clk->spec_regs + reg); | |
343 | } | |
344 | ||
345 | static inline void hsdk_pll_set_cfg(struct hsdk_cgu_clk *clk, | |
346 | const struct hsdk_pll_cfg *cfg) | |
347 | { | |
348 | u32 val = 0; | |
349 | ||
350 | /* Powerdown and Bypass bits should be cleared */ | |
351 | val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT; | |
352 | val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT; | |
353 | val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT; | |
354 | val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT; | |
355 | ||
356 | pr_debug("write configurarion: %#x\n", val); | |
357 | ||
358 | hsdk_pll_write(clk, CGU_PLL_CTRL, val); | |
359 | } | |
360 | ||
361 | static inline bool hsdk_pll_is_locked(struct hsdk_cgu_clk *clk) | |
362 | { | |
363 | return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK); | |
364 | } | |
365 | ||
366 | static inline bool hsdk_pll_is_err(struct hsdk_cgu_clk *clk) | |
367 | { | |
368 | return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR); | |
369 | } | |
370 | ||
371 | static ulong pll_get(struct clk *sclk) | |
372 | { | |
373 | u32 val; | |
374 | u64 rate; | |
375 | u32 idiv, fbdiv, odiv; | |
376 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
377 | ||
378 | val = hsdk_pll_read(clk, CGU_PLL_CTRL); | |
379 | ||
380 | pr_debug("current configurarion: %#x\n", val); | |
381 | ||
382 | /* Check if PLL is disabled */ | |
383 | if (val & CGU_PLL_CTRL_PD) | |
384 | return 0; | |
385 | ||
386 | /* Check if PLL is bypassed */ | |
387 | if (val & CGU_PLL_CTRL_BYPASS) | |
388 | return PARENT_RATE; | |
389 | ||
390 | /* input divider = reg.idiv + 1 */ | |
391 | idiv = 1 + ((val & CGU_PLL_CTRL_IDIV_MASK) >> CGU_PLL_CTRL_IDIV_SHIFT); | |
392 | /* fb divider = 2*(reg.fbdiv + 1) */ | |
393 | fbdiv = 2 * (1 + ((val & CGU_PLL_CTRL_FBDIV_MASK) >> CGU_PLL_CTRL_FBDIV_SHIFT)); | |
394 | /* output divider = 2^(reg.odiv) */ | |
395 | odiv = 1 << ((val & CGU_PLL_CTRL_ODIV_MASK) >> CGU_PLL_CTRL_ODIV_SHIFT); | |
396 | ||
397 | rate = (u64)PARENT_RATE * fbdiv; | |
398 | do_div(rate, idiv * odiv); | |
399 | ||
400 | return rate; | |
401 | } | |
402 | ||
403 | static unsigned long hsdk_pll_round_rate(struct clk *sclk, unsigned long rate) | |
404 | { | |
405 | int i; | |
406 | unsigned long best_rate; | |
407 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
408 | const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; | |
409 | ||
410 | if (pll_cfg[0].rate == 0) | |
411 | return -EINVAL; | |
412 | ||
413 | best_rate = pll_cfg[0].rate; | |
414 | ||
415 | for (i = 1; pll_cfg[i].rate != 0; i++) { | |
416 | if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate)) | |
417 | best_rate = pll_cfg[i].rate; | |
418 | } | |
419 | ||
420 | pr_debug("chosen best rate: %lu\n", best_rate); | |
421 | ||
422 | return best_rate; | |
423 | } | |
424 | ||
425 | static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *clk, | |
426 | unsigned long rate, | |
427 | const struct hsdk_pll_cfg *cfg) | |
428 | { | |
429 | hsdk_pll_set_cfg(clk, cfg); | |
430 | ||
431 | /* | |
432 | * Wait until CGU relocks and check error status. | |
433 | * If after timeout CGU is unlocked yet return error. | |
434 | */ | |
435 | udelay(HSDK_PLL_MAX_LOCK_TIME); | |
436 | if (!hsdk_pll_is_locked(clk)) | |
437 | return -ETIMEDOUT; | |
438 | ||
439 | if (hsdk_pll_is_err(clk)) | |
440 | return -EINVAL; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *clk, | |
446 | unsigned long rate, | |
447 | const struct hsdk_pll_cfg *cfg) | |
448 | { | |
449 | /* | |
450 | * When core clock exceeds 500MHz, the divider for the interface | |
451 | * clock must be programmed to div-by-2. | |
452 | */ | |
453 | if (rate > CORE_IF_CLK_THRESHOLD_HZ) | |
454 | hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_2); | |
455 | ||
456 | hsdk_pll_set_cfg(clk, cfg); | |
457 | ||
458 | /* | |
459 | * Wait until CGU relocks and check error status. | |
460 | * If after timeout CGU is unlocked yet return error. | |
461 | */ | |
462 | udelay(HSDK_PLL_MAX_LOCK_TIME); | |
463 | if (!hsdk_pll_is_locked(clk)) | |
464 | return -ETIMEDOUT; | |
465 | ||
466 | if (hsdk_pll_is_err(clk)) | |
467 | return -EINVAL; | |
468 | ||
469 | /* | |
470 | * Program divider to div-by-1 if we succesfuly set core clock below | |
471 | * 500MHz threshold. | |
472 | */ | |
473 | if (rate <= CORE_IF_CLK_THRESHOLD_HZ) | |
474 | hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_1); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | static ulong pll_set(struct clk *sclk, ulong rate) | |
480 | { | |
481 | int i; | |
482 | unsigned long best_rate; | |
483 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
484 | const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; | |
485 | ||
486 | best_rate = hsdk_pll_round_rate(sclk, rate); | |
487 | ||
488 | for (i = 0; pll_cfg[i].rate != 0; i++) { | |
489 | if (pll_cfg[i].rate == best_rate) { | |
490 | return clk->pll_devdata->update_rate(clk, best_rate, | |
491 | &pll_cfg[i]); | |
492 | } | |
493 | } | |
494 | ||
320c8a1a | 495 | pr_err("invalid rate=%ld Hz, parent_rate=%d Hz\n", best_rate, PARENT_RATE); |
e80dac0a EP |
496 | |
497 | return -EINVAL; | |
498 | } | |
499 | ||
500 | static int idiv_off(struct clk *sclk) | |
501 | { | |
502 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
503 | ||
504 | hsdk_idiv_write(clk, 0); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static ulong idiv_get(struct clk *sclk) | |
510 | { | |
511 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
512 | ulong parent_rate = pll_get(sclk); | |
513 | u32 div_factor = hsdk_idiv_read(clk); | |
514 | ||
515 | div_factor &= CGU_IDIV_MASK; | |
516 | ||
517 | pr_debug("current configurarion: %#x (%d)\n", div_factor, div_factor); | |
518 | ||
519 | if (div_factor == 0) | |
520 | return 0; | |
521 | ||
522 | return parent_rate / div_factor; | |
523 | } | |
524 | ||
075cbae1 EP |
525 | /* Special behavior: wen we set this clock we set both idiv and pll */ |
526 | static ulong cpu_clk_set(struct clk *sclk, ulong rate) | |
527 | { | |
528 | ulong ret; | |
529 | ||
530 | ret = pll_set(sclk, rate); | |
531 | idiv_set(sclk, rate); | |
532 | ||
533 | return ret; | |
534 | } | |
535 | ||
536 | /* Special behavior: wen we set this clock we set both idiv and pll and all pll dividers */ | |
537 | static ulong axi_clk_set(struct clk *sclk, ulong rate) | |
538 | { | |
539 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
540 | ulong pll_rate; | |
541 | int i, freq_idx = -1; | |
542 | ulong ret = 0; | |
543 | ||
544 | pll_rate = pll_get(sclk); | |
545 | ||
546 | for (i = 0; i < MAX_AXI_CLOCKS; i++) { | |
547 | if (axi_clk_cfg.clk_rate[i] == rate) { | |
548 | freq_idx = i; | |
549 | break; | |
550 | } | |
551 | } | |
552 | ||
553 | if (freq_idx < 0) { | |
554 | pr_err("axi clk: invalid rate=%ld Hz\n", rate); | |
555 | return -EINVAL; | |
556 | } | |
557 | ||
558 | /* configure PLL before dividers */ | |
559 | if (axi_clk_cfg.pll_rate[freq_idx] < pll_rate) | |
560 | ret = pll_set(sclk, axi_clk_cfg.pll_rate[freq_idx]); | |
561 | ||
562 | /* configure SYS dividers */ | |
563 | for (i = 0; i < CGU_SYS_CLOCKS; i++) { | |
564 | clk->idiv_regs = clk->cgu_regs + axi_clk_cfg.idiv[i].oft; | |
565 | hsdk_idiv_write(clk, axi_clk_cfg.idiv[i].val[freq_idx]); | |
566 | } | |
567 | ||
568 | /* configure PLL after dividers */ | |
569 | if (axi_clk_cfg.pll_rate[freq_idx] >= pll_rate) | |
570 | ret = pll_set(sclk, axi_clk_cfg.pll_rate[freq_idx]); | |
571 | ||
572 | return ret; | |
573 | } | |
574 | ||
575 | static ulong tun_clk_set(struct clk *sclk, ulong rate) | |
576 | { | |
577 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
578 | ulong pll_rate; | |
579 | int i, freq_idx = -1; | |
580 | ulong ret = 0; | |
581 | ||
582 | pll_rate = pll_get(sclk); | |
583 | ||
584 | for (i = 0; i < MAX_TUN_CLOCKS; i++) { | |
585 | if (tun_clk_cfg.clk_rate[i] == rate) { | |
586 | freq_idx = i; | |
587 | break; | |
588 | } | |
589 | } | |
590 | ||
591 | if (freq_idx < 0) { | |
592 | pr_err("tun clk: invalid rate=%ld Hz\n", rate); | |
593 | return -EINVAL; | |
594 | } | |
595 | ||
596 | /* configure PLL before dividers */ | |
597 | if (tun_clk_cfg.pll_rate[freq_idx] < pll_rate) | |
598 | ret = pll_set(sclk, tun_clk_cfg.pll_rate[freq_idx]); | |
599 | ||
600 | /* configure SYS dividers */ | |
601 | for (i = 0; i < CGU_TUN_CLOCKS; i++) { | |
602 | clk->idiv_regs = clk->cgu_regs + tun_clk_cfg.idiv[i].oft; | |
603 | hsdk_idiv_write(clk, tun_clk_cfg.idiv[i].val[freq_idx]); | |
604 | } | |
605 | ||
606 | /* configure PLL after dividers */ | |
607 | if (tun_clk_cfg.pll_rate[freq_idx] >= pll_rate) | |
608 | ret = pll_set(sclk, tun_clk_cfg.pll_rate[freq_idx]); | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
e80dac0a EP |
613 | static ulong idiv_set(struct clk *sclk, ulong rate) |
614 | { | |
615 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
616 | ulong parent_rate = pll_get(sclk); | |
617 | u32 div_factor; | |
618 | ||
619 | div_factor = parent_rate / rate; | |
620 | if (abs(rate - parent_rate / (div_factor + 1)) <= | |
621 | abs(rate - parent_rate / div_factor)) { | |
622 | div_factor += 1; | |
623 | } | |
624 | ||
625 | if (div_factor & ~CGU_IDIV_MASK) { | |
320c8a1a | 626 | pr_err("invalid rate=%ld Hz, parent_rate=%ld Hz, div=%d: max divider valie is%d\n", |
e80dac0a EP |
627 | rate, parent_rate, div_factor, CGU_IDIV_MASK); |
628 | ||
629 | div_factor = CGU_IDIV_MASK; | |
630 | } | |
631 | ||
632 | if (div_factor == 0) { | |
320c8a1a | 633 | pr_err("invalid rate=%ld Hz, parent_rate=%ld Hz, div=%d: min divider valie is 1\n", |
e80dac0a EP |
634 | rate, parent_rate, div_factor); |
635 | ||
636 | div_factor = 1; | |
637 | } | |
638 | ||
639 | hsdk_idiv_write(clk, div_factor); | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static int hsdk_prepare_clock_tree_branch(struct clk *sclk) | |
645 | { | |
646 | struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); | |
647 | ||
648 | if (sclk->id >= CGU_MAX_CLOCKS) | |
649 | return -EINVAL; | |
650 | ||
651 | clk->pll_devdata = clock_map[sclk->id].pll_devdata; | |
652 | clk->regs = clk->cgu_regs + clock_map[sclk->id].cgu_pll_oft; | |
653 | clk->spec_regs = clk->creg_regs + clock_map[sclk->id].creg_div_oft; | |
654 | clk->idiv_regs = clk->cgu_regs + clock_map[sclk->id].cgu_div_oft; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | static ulong hsdk_cgu_get_rate(struct clk *sclk) | |
660 | { | |
661 | if (hsdk_prepare_clock_tree_branch(sclk)) | |
662 | return -EINVAL; | |
663 | ||
664 | return clock_map[sclk->id].get_rate(sclk); | |
665 | } | |
666 | ||
667 | static ulong hsdk_cgu_set_rate(struct clk *sclk, ulong rate) | |
668 | { | |
669 | if (hsdk_prepare_clock_tree_branch(sclk)) | |
670 | return -EINVAL; | |
671 | ||
672 | return clock_map[sclk->id].set_rate(sclk, rate); | |
673 | } | |
674 | ||
675 | static int hsdk_cgu_disable(struct clk *sclk) | |
676 | { | |
677 | if (hsdk_prepare_clock_tree_branch(sclk)) | |
678 | return -EINVAL; | |
679 | ||
680 | if (clock_map[sclk->id].disable) | |
681 | return clock_map[sclk->id].disable(sclk); | |
682 | ||
683 | return -ENOTSUPP; | |
684 | } | |
685 | ||
686 | static const struct clk_ops hsdk_cgu_ops = { | |
687 | .set_rate = hsdk_cgu_set_rate, | |
688 | .get_rate = hsdk_cgu_get_rate, | |
689 | .disable = hsdk_cgu_disable, | |
690 | }; | |
691 | ||
692 | static int hsdk_cgu_clk_probe(struct udevice *dev) | |
693 | { | |
694 | struct hsdk_cgu_clk *pll_clk = dev_get_priv(dev); | |
695 | ||
696 | BUILD_BUG_ON(ARRAY_SIZE(clock_map) != CGU_MAX_CLOCKS); | |
697 | ||
698 | pll_clk->cgu_regs = (void __iomem *)devfdt_get_addr_index(dev, 0); | |
699 | if (!pll_clk->cgu_regs) | |
700 | return -EINVAL; | |
701 | ||
702 | pll_clk->creg_regs = (void __iomem *)devfdt_get_addr_index(dev, 1); | |
703 | if (!pll_clk->creg_regs) | |
704 | return -EINVAL; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
709 | static const struct udevice_id hsdk_cgu_clk_id[] = { | |
710 | { .compatible = "snps,hsdk-cgu-clock" }, | |
711 | { } | |
712 | }; | |
713 | ||
714 | U_BOOT_DRIVER(hsdk_cgu_clk) = { | |
715 | .name = "hsdk-cgu-clk", | |
716 | .id = UCLASS_CLK, | |
717 | .of_match = hsdk_cgu_clk_id, | |
718 | .probe = hsdk_cgu_clk_probe, | |
f6d7812d | 719 | .priv_auto_alloc_size = sizeof(struct hsdk_cgu_clk), |
e80dac0a EP |
720 | .ops = &hsdk_cgu_ops, |
721 | }; |