2 * Synopsys HSDK SDP CGU clock driver
4 * Copyright (C) 2017 Synopsys
5 * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
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.
13 #include <clk-uclass.h>
19 * Synopsys ARC HSDK clock tree.
29 * | |-->|CGU_ARC_IDIV|----------->
30 * | |-->|CREG_CORE_IF_DIV|------->
36 * | |-->|CGU_SYS_IDIV_APB|------->
37 * | |-->|CGU_SYS_IDIV_AXI|------->
38 * | |-->|CGU_SYS_IDIV_*|--------->
39 * | |-->|CGU_SYS_IDIV_EBI_REF|--->
45 * | |-->|CGU_TUN_IDIV_TUN|----------->
46 * | |-->|CGU_TUN_IDIV_ROM|----------->
47 * | |-->|CGU_TUN_IDIV_PWM|----------->
53 * |---------------------------->
63 * |-->|CGU_HDMI_IDIV_APB|------>
66 #define CGU_ARC_IDIV 0x080
67 #define CGU_TUN_IDIV_TUN 0x380
68 #define CGU_TUN_IDIV_ROM 0x390
69 #define CGU_TUN_IDIV_PWM 0x3A0
70 #define CGU_TUN_IDIV_TIMER 0x3B0
71 #define CGU_HDMI_IDIV_APB 0x480
72 #define CGU_SYS_IDIV_APB 0x180
73 #define CGU_SYS_IDIV_AXI 0x190
74 #define CGU_SYS_IDIV_ETH 0x1A0
75 #define CGU_SYS_IDIV_USB 0x1B0
76 #define CGU_SYS_IDIV_SDIO 0x1C0
77 #define CGU_SYS_IDIV_HDMI 0x1D0
78 #define CGU_SYS_IDIV_GFX_CORE 0x1E0
79 #define CGU_SYS_IDIV_GFX_DMA 0x1F0
80 #define CGU_SYS_IDIV_GFX_CFG 0x200
81 #define CGU_SYS_IDIV_DMAC_CORE 0x210
82 #define CGU_SYS_IDIV_DMAC_CFG 0x220
83 #define CGU_SYS_IDIV_SDIO_REF 0x230
84 #define CGU_SYS_IDIV_SPI_REF 0x240
85 #define CGU_SYS_IDIV_I2C_REF 0x250
86 #define CGU_SYS_IDIV_UART_REF 0x260
87 #define CGU_SYS_IDIV_EBI_REF 0x270
89 #define CGU_IDIV_MASK 0xFF /* All idiv have 8 significant bits */
91 #define CGU_ARC_PLL 0x0
92 #define CGU_SYS_PLL 0x10
93 #define CGU_DDR_PLL 0x20
94 #define CGU_TUN_PLL 0x30
95 #define CGU_HDMI_PLL 0x40
97 #define CGU_PLL_CTRL 0x000 /* ARC PLL control register */
98 #define CGU_PLL_STATUS 0x004 /* ARC PLL status register */
99 #define CGU_PLL_FMEAS 0x008 /* ARC PLL frequency measurement register */
100 #define CGU_PLL_MON 0x00C /* ARC PLL monitor register */
102 #define CGU_PLL_CTRL_ODIV_SHIFT 2
103 #define CGU_PLL_CTRL_IDIV_SHIFT 4
104 #define CGU_PLL_CTRL_FBDIV_SHIFT 9
105 #define CGU_PLL_CTRL_BAND_SHIFT 20
107 #define CGU_PLL_CTRL_ODIV_MASK GENMASK(3, CGU_PLL_CTRL_ODIV_SHIFT)
108 #define CGU_PLL_CTRL_IDIV_MASK GENMASK(8, CGU_PLL_CTRL_IDIV_SHIFT)
109 #define CGU_PLL_CTRL_FBDIV_MASK GENMASK(15, CGU_PLL_CTRL_FBDIV_SHIFT)
111 #define CGU_PLL_CTRL_PD BIT(0)
112 #define CGU_PLL_CTRL_BYPASS BIT(1)
114 #define CGU_PLL_STATUS_LOCK BIT(0)
115 #define CGU_PLL_STATUS_ERR BIT(1)
117 #define HSDK_PLL_MAX_LOCK_TIME 100 /* 100 us */
119 #define CREG_CORE_IF_DIV 0x000 /* ARC CORE interface divider */
120 #define CORE_IF_CLK_THRESHOLD_HZ 500000000
121 #define CREG_CORE_IF_CLK_DIV_1 0x0
122 #define CREG_CORE_IF_CLK_DIV_2 0x1
124 #define MIN_PLL_RATE 100000000 /* 100 MHz */
125 #define PARENT_RATE_33 33333333 /* fixed clock - xtal */
126 #define PARENT_RATE_27 27000000 /* fixed clock - xtal */
127 #define CGU_MAX_CLOCKS 27
129 #define MAX_FREQ_VARIATIONS 6
131 struct hsdk_idiv_cfg {
133 const u8 val[MAX_FREQ_VARIATIONS];
136 struct hsdk_div_full_cfg {
137 const u32 clk_rate[MAX_FREQ_VARIATIONS];
138 const u32 pll_rate[MAX_FREQ_VARIATIONS];
139 const struct hsdk_idiv_cfg idiv[];
142 static const struct hsdk_div_full_cfg tun_clk_cfg = {
143 { 25000000, 50000000, 75000000, 100000000, 125000000, 150000000 },
144 { 600000000, 600000000, 600000000, 600000000, 750000000, 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 { CGU_TUN_IDIV_TIMER, { 12, 12, 12, 12, 15, 12 } },
153 static const struct hsdk_div_full_cfg axi_clk_cfg = {
154 { 200000000, 400000000, 600000000, 800000000 },
155 { 800000000, 800000000, 600000000, 800000000 }, {
156 { CGU_SYS_IDIV_APB, { 4, 4, 3, 4 } }, /* APB */
157 { CGU_SYS_IDIV_AXI, { 4, 2, 1, 1 } }, /* AXI */
158 { CGU_SYS_IDIV_ETH, { 2, 2, 2, 2 } }, /* ETH */
159 { CGU_SYS_IDIV_USB, { 2, 2, 2, 2 } }, /* USB */
160 { CGU_SYS_IDIV_SDIO, { 2, 2, 2, 2 } }, /* SDIO */
161 { CGU_SYS_IDIV_HDMI, { 2, 2, 2, 2 } }, /* HDMI */
162 { CGU_SYS_IDIV_GFX_CORE, { 1, 1, 1, 1 } }, /* GPU-CORE */
163 { CGU_SYS_IDIV_GFX_DMA, { 2, 2, 2, 2 } }, /* GPU-DMA */
164 { CGU_SYS_IDIV_GFX_CFG, { 4, 4, 3, 4 } }, /* GPU-CFG */
165 { CGU_SYS_IDIV_DMAC_CORE,{ 2, 2, 2, 2 } }, /* DMAC-CORE */
166 { CGU_SYS_IDIV_DMAC_CFG, { 4, 4, 3, 4 } }, /* DMAC-CFG */
167 { CGU_SYS_IDIV_SDIO_REF, { 8, 8, 6, 8 } }, /* SDIO-REF */
168 { CGU_SYS_IDIV_SPI_REF, { 24, 24, 18, 24 } }, /* SPI-REF */
169 { CGU_SYS_IDIV_I2C_REF, { 4, 4, 3, 4 } }, /* I2C-REF */
170 { CGU_SYS_IDIV_UART_REF, { 24, 24, 18, 24 } }, /* UART-REF */
171 { CGU_SYS_IDIV_EBI_REF, { 16, 16, 12, 16 } }, /* EBI-REF */
176 struct hsdk_pll_cfg {
184 static const struct hsdk_pll_cfg asdt_pll_cfg[] = {
185 { 100000000, 0, 11, 3, 0 },
186 { 125000000, 0, 14, 3, 0 },
187 { 133000000, 0, 15, 3, 0 },
188 { 150000000, 0, 17, 3, 0 },
189 { 200000000, 1, 47, 3, 0 },
190 { 233000000, 1, 27, 2, 0 },
191 { 300000000, 1, 35, 2, 0 },
192 { 333000000, 1, 39, 2, 0 },
193 { 400000000, 1, 47, 2, 0 },
194 { 500000000, 0, 14, 1, 0 },
195 { 600000000, 0, 17, 1, 0 },
196 { 700000000, 0, 20, 1, 0 },
197 { 750000000, 1, 44, 1, 0 },
198 { 800000000, 0, 23, 1, 0 },
199 { 900000000, 1, 26, 0, 0 },
200 { 1000000000, 1, 29, 0, 0 },
201 { 1100000000, 1, 32, 0, 0 },
202 { 1200000000, 1, 35, 0, 0 },
203 { 1300000000, 1, 38, 0, 0 },
204 { 1400000000, 1, 41, 0, 0 },
205 { 1500000000, 1, 44, 0, 0 },
206 { 1600000000, 1, 47, 0, 0 },
210 static const struct hsdk_pll_cfg hdmi_pll_cfg[] = {
211 { 297000000, 0, 21, 2, 0 },
212 { 540000000, 0, 19, 1, 0 },
213 { 594000000, 0, 21, 1, 0 },
217 struct hsdk_cgu_clk {
218 /* CGU block register */
219 void __iomem *cgu_regs;
220 /* CREG block register */
221 void __iomem *creg_regs;
225 /* PLLs special registers */
226 void __iomem *spec_regs;
228 const struct hsdk_pll_devdata *pll_devdata;
230 /* Dividers registers */
231 void __iomem *idiv_regs;
234 struct hsdk_pll_devdata {
235 const u32 parent_rate;
236 const struct hsdk_pll_cfg *const pll_cfg;
237 const int (*const update_rate)(struct hsdk_cgu_clk *clk,
239 const struct hsdk_pll_cfg *cfg);
242 static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *, unsigned long,
243 const struct hsdk_pll_cfg *);
244 static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *, unsigned long,
245 const struct hsdk_pll_cfg *);
247 static const struct hsdk_pll_devdata core_pll_dat = {
248 .parent_rate = PARENT_RATE_33,
249 .pll_cfg = asdt_pll_cfg,
250 .update_rate = hsdk_pll_core_update_rate,
253 static const struct hsdk_pll_devdata sdt_pll_dat = {
254 .parent_rate = PARENT_RATE_33,
255 .pll_cfg = asdt_pll_cfg,
256 .update_rate = hsdk_pll_comm_update_rate,
259 static const struct hsdk_pll_devdata hdmi_pll_dat = {
260 .parent_rate = PARENT_RATE_27,
261 .pll_cfg = hdmi_pll_cfg,
262 .update_rate = hsdk_pll_comm_update_rate,
265 static ulong idiv_set(struct clk *, ulong);
266 static ulong cpu_clk_set(struct clk *, ulong);
267 static ulong axi_clk_set(struct clk *, ulong);
268 static ulong tun_clk_set(struct clk *, ulong);
269 static ulong idiv_get(struct clk *);
270 static int idiv_off(struct clk *);
271 static ulong pll_set(struct clk *, ulong);
272 static ulong pll_get(struct clk *);
274 struct hsdk_cgu_clock_map {
275 const u32 cgu_pll_oft;
276 const u32 cgu_div_oft;
277 const struct hsdk_pll_devdata *const pll_devdata;
278 const ulong (*const get_rate)(struct clk *clk);
279 const ulong (*const set_rate)(struct clk *clk, ulong rate);
280 const int (*const disable)(struct clk *clk);
283 static const struct hsdk_cgu_clock_map clock_map[] = {
284 { CGU_ARC_PLL, 0, &core_pll_dat, pll_get, pll_set, NULL },
285 { CGU_ARC_PLL, CGU_ARC_IDIV, &core_pll_dat, idiv_get, cpu_clk_set, idiv_off },
286 { CGU_DDR_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
287 { CGU_SYS_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
288 { CGU_SYS_PLL, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
289 { CGU_SYS_PLL, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, axi_clk_set, idiv_off },
290 { CGU_SYS_PLL, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
291 { CGU_SYS_PLL, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
292 { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
293 { CGU_SYS_PLL, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
294 { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
295 { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_DMA, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
296 { CGU_SYS_PLL, CGU_SYS_IDIV_GFX_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
297 { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
298 { CGU_SYS_PLL, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
299 { CGU_SYS_PLL, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
300 { CGU_SYS_PLL, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
301 { CGU_SYS_PLL, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
302 { CGU_SYS_PLL, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
303 { CGU_SYS_PLL, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
304 { CGU_TUN_PLL, 0, &sdt_pll_dat, pll_get, pll_set, NULL },
305 { CGU_TUN_PLL, CGU_TUN_IDIV_TUN, &sdt_pll_dat, idiv_get, tun_clk_set, idiv_off },
306 { CGU_TUN_PLL, CGU_TUN_IDIV_ROM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
307 { CGU_TUN_PLL, CGU_TUN_IDIV_PWM, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
308 { CGU_TUN_PLL, CGU_TUN_IDIV_TIMER, &sdt_pll_dat, idiv_get, idiv_set, idiv_off },
309 { CGU_HDMI_PLL, 0, &hdmi_pll_dat, pll_get, pll_set, NULL },
310 { CGU_HDMI_PLL, CGU_HDMI_IDIV_APB, &hdmi_pll_dat, idiv_get, idiv_set, idiv_off }
313 static inline void hsdk_idiv_write(struct hsdk_cgu_clk *clk, u32 val)
315 iowrite32(val, clk->idiv_regs);
318 static inline u32 hsdk_idiv_read(struct hsdk_cgu_clk *clk)
320 return ioread32(clk->idiv_regs);
323 static inline void hsdk_pll_write(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
325 iowrite32(val, clk->regs + reg);
328 static inline u32 hsdk_pll_read(struct hsdk_cgu_clk *clk, u32 reg)
330 return ioread32(clk->regs + reg);
333 static inline void hsdk_pll_spcwrite(struct hsdk_cgu_clk *clk, u32 reg, u32 val)
335 iowrite32(val, clk->spec_regs + reg);
338 static inline u32 hsdk_pll_spcread(struct hsdk_cgu_clk *clk, u32 reg)
340 return ioread32(clk->spec_regs + reg);
343 static inline void hsdk_pll_set_cfg(struct hsdk_cgu_clk *clk,
344 const struct hsdk_pll_cfg *cfg)
348 /* Powerdown and Bypass bits should be cleared */
349 val |= (u32)cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT;
350 val |= (u32)cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT;
351 val |= (u32)cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT;
352 val |= (u32)cfg->band << CGU_PLL_CTRL_BAND_SHIFT;
354 pr_debug("write configurarion: %#x\n", val);
356 hsdk_pll_write(clk, CGU_PLL_CTRL, val);
359 static inline bool hsdk_pll_is_locked(struct hsdk_cgu_clk *clk)
361 return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK);
364 static inline bool hsdk_pll_is_err(struct hsdk_cgu_clk *clk)
366 return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR);
369 static ulong pll_get(struct clk *sclk)
373 u32 idiv, fbdiv, odiv;
374 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
375 u32 parent_rate = clk->pll_devdata->parent_rate;
377 val = hsdk_pll_read(clk, CGU_PLL_CTRL);
379 pr_debug("current configurarion: %#x\n", val);
381 /* Check if PLL is bypassed */
382 if (val & CGU_PLL_CTRL_BYPASS)
385 /* Check if PLL is disabled */
386 if (val & CGU_PLL_CTRL_PD)
389 /* input divider = reg.idiv + 1 */
390 idiv = 1 + ((val & CGU_PLL_CTRL_IDIV_MASK) >> CGU_PLL_CTRL_IDIV_SHIFT);
391 /* fb divider = 2*(reg.fbdiv + 1) */
392 fbdiv = 2 * (1 + ((val & CGU_PLL_CTRL_FBDIV_MASK) >> CGU_PLL_CTRL_FBDIV_SHIFT));
393 /* output divider = 2^(reg.odiv) */
394 odiv = 1 << ((val & CGU_PLL_CTRL_ODIV_MASK) >> CGU_PLL_CTRL_ODIV_SHIFT);
396 rate = (u64)parent_rate * fbdiv;
397 do_div(rate, idiv * odiv);
402 static unsigned long hsdk_pll_round_rate(struct clk *sclk, unsigned long rate)
405 unsigned long best_rate;
406 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
407 const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg;
409 if (pll_cfg[0].rate == 0)
412 best_rate = pll_cfg[0].rate;
414 for (i = 1; pll_cfg[i].rate != 0; i++) {
415 if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate))
416 best_rate = pll_cfg[i].rate;
419 pr_debug("chosen best rate: %lu\n", best_rate);
424 static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *clk,
426 const struct hsdk_pll_cfg *cfg)
428 hsdk_pll_set_cfg(clk, cfg);
431 * Wait until CGU relocks and check error status.
432 * If after timeout CGU is unlocked yet return error.
434 udelay(HSDK_PLL_MAX_LOCK_TIME);
435 if (!hsdk_pll_is_locked(clk))
438 if (hsdk_pll_is_err(clk))
444 static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *clk,
446 const struct hsdk_pll_cfg *cfg)
449 * When core clock exceeds 500MHz, the divider for the interface
450 * clock must be programmed to div-by-2.
452 if (rate > CORE_IF_CLK_THRESHOLD_HZ)
453 hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_2);
455 hsdk_pll_set_cfg(clk, cfg);
458 * Wait until CGU relocks and check error status.
459 * If after timeout CGU is unlocked yet return error.
461 udelay(HSDK_PLL_MAX_LOCK_TIME);
462 if (!hsdk_pll_is_locked(clk))
465 if (hsdk_pll_is_err(clk))
469 * Program divider to div-by-1 if we succesfuly set core clock below
472 if (rate <= CORE_IF_CLK_THRESHOLD_HZ)
473 hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_1);
478 static ulong pll_set(struct clk *sclk, ulong rate)
481 unsigned long best_rate;
482 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
483 const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg;
485 best_rate = hsdk_pll_round_rate(sclk, rate);
487 for (i = 0; pll_cfg[i].rate != 0; i++) {
488 if (pll_cfg[i].rate == best_rate) {
489 return clk->pll_devdata->update_rate(clk, best_rate,
494 pr_err("invalid rate=%ld Hz, parent_rate=%d Hz\n", best_rate,
495 clk->pll_devdata->parent_rate);
500 static int idiv_off(struct clk *sclk)
502 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
504 hsdk_idiv_write(clk, 0);
509 static ulong idiv_get(struct clk *sclk)
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);
515 div_factor &= CGU_IDIV_MASK;
517 pr_debug("current configurarion: %#x (%d)\n", div_factor, div_factor);
522 return parent_rate / div_factor;
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)
530 ret = pll_set(sclk, rate);
531 idiv_set(sclk, rate);
538 * when we set these clocks we set both PLL and all idiv dividers related to
541 static ulong common_div_clk_set(struct clk *sclk, ulong rate,
542 const struct hsdk_div_full_cfg *cfg)
544 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
546 int i, freq_idx = -1;
549 pll_rate = pll_get(sclk);
551 for (i = 0; i < MAX_FREQ_VARIATIONS; i++) {
552 /* unused freq variations are filled with 0 */
553 if (!cfg->clk_rate[i])
556 if (cfg->clk_rate[i] == rate) {
563 pr_err("clk: invalid rate=%ld Hz\n", rate);
567 /* configure PLL before dividers */
568 if (cfg->pll_rate[freq_idx] < pll_rate)
569 ret = pll_set(sclk, cfg->pll_rate[freq_idx]);
571 /* configure SYS dividers */
572 for (i = 0; cfg->idiv[i].oft != 0; i++) {
573 clk->idiv_regs = clk->cgu_regs + cfg->idiv[i].oft;
574 hsdk_idiv_write(clk, cfg->idiv[i].val[freq_idx]);
577 /* configure PLL after dividers */
578 if (cfg->pll_rate[freq_idx] >= pll_rate)
579 ret = pll_set(sclk, cfg->pll_rate[freq_idx]);
584 static ulong axi_clk_set(struct clk *sclk, ulong rate)
586 return common_div_clk_set(sclk, rate, &axi_clk_cfg);
589 static ulong tun_clk_set(struct clk *sclk, ulong rate)
591 return common_div_clk_set(sclk, rate, &tun_clk_cfg);
594 static ulong idiv_set(struct clk *sclk, ulong rate)
596 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
597 ulong parent_rate = pll_get(sclk);
600 div_factor = parent_rate / rate;
601 if (abs(rate - parent_rate / (div_factor + 1)) <=
602 abs(rate - parent_rate / div_factor)) {
606 if (div_factor & ~CGU_IDIV_MASK) {
607 pr_err("invalid rate=%ld Hz, parent_rate=%ld Hz, div=%d: max divider valie is%d\n",
608 rate, parent_rate, div_factor, CGU_IDIV_MASK);
610 div_factor = CGU_IDIV_MASK;
613 if (div_factor == 0) {
614 pr_err("invalid rate=%ld Hz, parent_rate=%ld Hz, div=%d: min divider valie is 1\n",
615 rate, parent_rate, div_factor);
620 hsdk_idiv_write(clk, div_factor);
625 static int hsdk_prepare_clock_tree_branch(struct clk *sclk)
627 struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev);
629 if (sclk->id >= CGU_MAX_CLOCKS)
632 clk->pll_devdata = clock_map[sclk->id].pll_devdata;
633 clk->regs = clk->cgu_regs + clock_map[sclk->id].cgu_pll_oft;
634 clk->spec_regs = clk->creg_regs;
635 clk->idiv_regs = clk->cgu_regs + clock_map[sclk->id].cgu_div_oft;
640 static ulong hsdk_cgu_get_rate(struct clk *sclk)
642 if (hsdk_prepare_clock_tree_branch(sclk))
645 return clock_map[sclk->id].get_rate(sclk);
648 static ulong hsdk_cgu_set_rate(struct clk *sclk, ulong rate)
650 if (hsdk_prepare_clock_tree_branch(sclk))
653 return clock_map[sclk->id].set_rate(sclk, rate);
656 static int hsdk_cgu_disable(struct clk *sclk)
658 if (hsdk_prepare_clock_tree_branch(sclk))
661 if (clock_map[sclk->id].disable)
662 return clock_map[sclk->id].disable(sclk);
667 static const struct clk_ops hsdk_cgu_ops = {
668 .set_rate = hsdk_cgu_set_rate,
669 .get_rate = hsdk_cgu_get_rate,
670 .disable = hsdk_cgu_disable,
673 static int hsdk_cgu_clk_probe(struct udevice *dev)
675 struct hsdk_cgu_clk *pll_clk = dev_get_priv(dev);
677 BUILD_BUG_ON(ARRAY_SIZE(clock_map) != CGU_MAX_CLOCKS);
679 pll_clk->cgu_regs = (void __iomem *)devfdt_get_addr_index(dev, 0);
680 if (!pll_clk->cgu_regs)
683 pll_clk->creg_regs = (void __iomem *)devfdt_get_addr_index(dev, 1);
684 if (!pll_clk->creg_regs)
690 static const struct udevice_id hsdk_cgu_clk_id[] = {
691 { .compatible = "snps,hsdk-cgu-clock" },
695 U_BOOT_DRIVER(hsdk_cgu_clk) = {
696 .name = "hsdk-cgu-clk",
698 .of_match = hsdk_cgu_clk_id,
699 .probe = hsdk_cgu_clk_probe,
700 .priv_auto_alloc_size = sizeof(struct hsdk_cgu_clk),
701 .ops = &hsdk_cgu_ops,