1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
4 * Author: Andy Yan <andy.yan@rock-chips.com>
5 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
9 #include <clk-uclass.h>
11 #include <dt-structs.h>
18 #include <asm/arch-rockchip/clock.h>
19 #include <asm/arch-rockchip/cru_rk3368.h>
20 #include <asm/arch-rockchip/hardware.h>
23 #include <dt-bindings/clock/rk3368-cru.h>
24 #include <linux/stringify.h>
26 #if CONFIG_IS_ENABLED(OF_PLATDATA)
27 struct rk3368_clk_plat {
28 struct dtd_rockchip_rk3368_cru dtd;
38 #define OSC_HZ (24 * 1000 * 1000)
39 #define APLL_L_HZ (800 * 1000 * 1000)
40 #define APLL_B_HZ (816 * 1000 * 1000)
41 #define GPLL_HZ (576 * 1000 * 1000)
42 #define CPLL_HZ (400 * 1000 * 1000)
44 #define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
46 #define PLL_DIVISORS(hz, _nr, _no) { \
47 .nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no}; \
48 _Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
49 (_nr * _no) == hz, #hz "Hz cannot be hit with PLL " \
50 "divisors on line " __stringify(__LINE__));
52 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
53 static const struct pll_div apll_l_init_cfg = PLL_DIVISORS(APLL_L_HZ, 12, 2);
54 static const struct pll_div apll_b_init_cfg = PLL_DIVISORS(APLL_B_HZ, 1, 2);
55 #if !defined(CONFIG_TPL_BUILD)
56 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 2);
57 static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 6);
61 static ulong rk3368_clk_get_rate(struct clk *clk);
63 /* Get pll rate by id */
64 static uint32_t rkclk_pll_get_rate(struct rk3368_cru *cru,
65 enum rk3368_pll_id pll_id)
69 struct rk3368_pll *pll = &cru->pll[pll_id];
71 con = readl(&pll->con3);
73 switch ((con & PLL_MODE_MASK) >> PLL_MODE_SHIFT) {
77 con = readl(&pll->con0);
78 no = ((con & PLL_OD_MASK) >> PLL_OD_SHIFT) + 1;
79 nr = ((con & PLL_NR_MASK) >> PLL_NR_SHIFT) + 1;
80 con = readl(&pll->con1);
81 nf = ((con & PLL_NF_MASK) >> PLL_NF_SHIFT) + 1;
83 return (24 * nf / (nr * no)) * 1000000;
84 case PLL_MODE_DEEP_SLOW:
90 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
91 static int rkclk_set_pll(struct rk3368_cru *cru, enum rk3368_pll_id pll_id,
92 const struct pll_div *div)
94 struct rk3368_pll *pll = &cru->pll[pll_id];
95 /* All PLLs have same VCO and output frequency range restrictions*/
96 uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
97 uint output_hz = vco_hz / div->no;
99 debug("PLL at %p: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n",
100 pll, div->nf, div->nr, div->no, vco_hz, output_hz);
102 /* enter slow mode and reset pll */
103 rk_clrsetreg(&pll->con3, PLL_MODE_MASK | PLL_RESET_MASK,
104 PLL_RESET << PLL_RESET_SHIFT);
106 rk_clrsetreg(&pll->con0, PLL_NR_MASK | PLL_OD_MASK,
107 ((div->nr - 1) << PLL_NR_SHIFT) |
108 ((div->no - 1) << PLL_OD_SHIFT));
109 writel((div->nf - 1) << PLL_NF_SHIFT, &pll->con1);
111 * BWADJ should be set to NF / 2 to ensure the nominal bandwidth.
112 * Compare the RK3368 TRM, section "3.6.4 PLL Bandwidth Adjustment".
114 clrsetbits_le32(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);
118 /* return from reset */
119 rk_clrreg(&pll->con3, PLL_RESET_MASK);
121 /* waiting for pll lock */
122 while (!(readl(&pll->con1) & PLL_LOCK_STA))
125 rk_clrsetreg(&pll->con3, PLL_MODE_MASK,
126 PLL_MODE_NORMAL << PLL_MODE_SHIFT);
132 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
133 static void rkclk_init(struct rk3368_cru *cru)
135 u32 apllb, aplll, dpll, cpll, gpll;
137 rkclk_set_pll(cru, APLLB, &apll_b_init_cfg);
138 rkclk_set_pll(cru, APLLL, &apll_l_init_cfg);
139 #if !defined(CONFIG_TPL_BUILD)
141 * If we plan to return to the boot ROM, we can't increase the
142 * GPLL rate from the SPL stage.
144 rkclk_set_pll(cru, GPLL, &gpll_init_cfg);
145 rkclk_set_pll(cru, CPLL, &cpll_init_cfg);
148 apllb = rkclk_pll_get_rate(cru, APLLB);
149 aplll = rkclk_pll_get_rate(cru, APLLL);
150 dpll = rkclk_pll_get_rate(cru, DPLL);
151 cpll = rkclk_pll_get_rate(cru, CPLL);
152 gpll = rkclk_pll_get_rate(cru, GPLL);
154 debug("%s apllb(%d) apll(%d) dpll(%d) cpll(%d) gpll(%d)\n",
155 __func__, apllb, aplll, dpll, cpll, gpll);
159 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
160 static ulong rk3368_mmc_get_clk(struct rk3368_cru *cru, uint clk_id)
162 u32 div, con, con_id, rate;
179 con = readl(&cru->clksel_con[con_id]);
180 switch (con & MMC_PLL_SEL_MASK) {
181 case MMC_PLL_SEL_GPLL:
182 pll_rate = rkclk_pll_get_rate(cru, GPLL);
184 case MMC_PLL_SEL_24M:
187 case MMC_PLL_SEL_CPLL:
188 pll_rate = rkclk_pll_get_rate(cru, CPLL);
190 case MMC_PLL_SEL_USBPHY_480M:
194 div = (con & MMC_CLK_DIV_MASK) >> MMC_CLK_DIV_SHIFT;
195 rate = DIV_TO_RATE(pll_rate, div);
197 debug("%s: raw rate %d (post-divide by 2)\n", __func__, rate);
201 static ulong rk3368_mmc_find_best_rate_and_parent(struct clk *clk,
208 const ulong MHz = 1000000;
213 { .mux = MMC_PLL_SEL_CPLL, .rate = CPLL_HZ },
214 { .mux = MMC_PLL_SEL_GPLL, .rate = GPLL_HZ },
215 { .mux = MMC_PLL_SEL_24M, .rate = 24 * MHz }
218 debug("%s: target rate %ld\n", __func__, rate);
219 for (i = 0; i < ARRAY_SIZE(parents); ++i) {
221 * Find the largest rate no larger than the target-rate for
222 * the current parent.
224 ulong parent_rate = parents[i].rate;
225 u32 div = DIV_ROUND_UP(parent_rate, rate);
227 ulong new_rate = parent_rate / adj_div;
229 debug("%s: rate %ld, parent-mux %d, parent-rate %ld, div %d\n",
230 __func__, rate, parents[i].mux, parents[i].rate, div);
232 /* Skip, if not representable */
233 if ((div - 1) > MMC_CLK_DIV_MASK)
236 /* Skip, if we already have a better (or equal) solution */
237 if (new_rate <= best_rate)
240 /* This is our new best rate. */
241 best_rate = new_rate;
242 *best_mux = parents[i].mux;
246 debug("%s: best_mux = %x, best_div = %d, best_rate = %ld\n",
247 __func__, *best_mux, *best_div, best_rate);
252 static ulong rk3368_mmc_set_clk(struct clk *clk, ulong rate)
254 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
255 struct rk3368_cru *cru = priv->cru;
256 ulong clk_id = clk->id;
257 u32 con_id, mux = 0, div = 0;
259 /* Find the best parent and rate */
260 rk3368_mmc_find_best_rate_and_parent(clk, rate << 1, &mux, &div);
276 rk_clrsetreg(&cru->clksel_con[con_id],
277 MMC_PLL_SEL_MASK | MMC_CLK_DIV_MASK,
280 return rk3368_mmc_get_clk(cru, clk_id);
284 #if IS_ENABLED(CONFIG_TPL_BUILD)
285 static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate)
287 const struct pll_div *dpll_cfg = NULL;
288 const ulong MHz = 1000000;
290 /* Fout = ((Fin /NR) * NF )/ NO */
291 static const struct pll_div dpll_1200 = PLL_DIVISORS(1200 * MHz, 1, 1);
292 static const struct pll_div dpll_1332 = PLL_DIVISORS(1332 * MHz, 2, 1);
293 static const struct pll_div dpll_1600 = PLL_DIVISORS(1600 * MHz, 3, 2);
297 dpll_cfg = &dpll_1200;
300 dpll_cfg = &dpll_1332;
303 dpll_cfg = &dpll_1600;
306 pr_err("Unsupported SDRAM frequency!,%ld\n", set_rate);
308 rkclk_set_pll(cru, DPLL, dpll_cfg);
314 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
315 static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru, ulong set_rate)
320 * The gmac clock can be derived either from an external clock
321 * or can be generated from internally by a divider from SCLK_MAC.
323 if (readl(&cru->clksel_con[43]) & GMAC_MUX_SEL_EXTCLK) {
324 /* An external clock will always generate the right rate... */
327 u32 con = readl(&cru->clksel_con[43]);
331 if (((con >> GMAC_PLL_SHIFT) & GMAC_PLL_MASK) ==
332 GMAC_PLL_SELECT_GENERAL)
334 else if (((con >> GMAC_PLL_SHIFT) & GMAC_PLL_MASK) ==
335 GMAC_PLL_SELECT_CODEC)
338 /* CPLL is not set */
341 div = DIV_ROUND_UP(pll_rate, set_rate) - 1;
343 rk_clrsetreg(&cru->clksel_con[43], GMAC_DIV_CON_MASK,
344 div << GMAC_DIV_CON_SHIFT);
346 debug("Unsupported div for gmac:%d\n", div);
348 return DIV_TO_RATE(pll_rate, div);
356 * RK3368 SPI clocks have a common divider-width (7 bits) and a single bit
357 * to select either CPLL or GPLL as the clock-parent. The location within
358 * the enclosing CLKSEL_CON (i.e. div_shift and sel_shift) are variable.
362 uint8_t reg; /* CLKSEL_CON[reg] register in CRU */
368 * The entries are numbered relative to their offset from SCLK_SPI0.
370 static const struct spi_clkreg spi_clkregs[] = {
371 [0] = { .reg = 45, .div_shift = 0, .sel_shift = 7, },
372 [1] = { .reg = 45, .div_shift = 8, .sel_shift = 15, },
373 [2] = { .reg = 46, .div_shift = 8, .sel_shift = 15, },
376 static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
378 return (val >> shift) & ((1 << width) - 1);
381 static ulong rk3368_spi_get_clk(struct rk3368_cru *cru, ulong clk_id)
383 const struct spi_clkreg *spiclk = NULL;
387 case SCLK_SPI0 ... SCLK_SPI2:
388 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
392 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
396 val = readl(&cru->clksel_con[spiclk->reg]);
397 div = extract_bits(val, 7, spiclk->div_shift);
399 debug("%s: div 0x%x\n", __func__, div);
400 return DIV_TO_RATE(GPLL_HZ, div);
403 static ulong rk3368_spi_set_clk(struct rk3368_cru *cru, ulong clk_id, uint hz)
405 const struct spi_clkreg *spiclk = NULL;
408 src_clk_div = DIV_ROUND_UP(GPLL_HZ, hz);
409 assert(src_clk_div < 127);
412 case SCLK_SPI0 ... SCLK_SPI2:
413 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
417 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
421 rk_clrsetreg(&cru->clksel_con[spiclk->reg],
422 ((0x7f << spiclk->div_shift) |
423 (0x1 << spiclk->sel_shift)),
424 ((src_clk_div << spiclk->div_shift) |
425 (1 << spiclk->sel_shift)));
427 return rk3368_spi_get_clk(cru, clk_id);
430 static ulong rk3368_saradc_get_clk(struct rk3368_cru *cru)
434 val = readl(&cru->clksel_con[25]);
435 div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT,
436 CLK_SARADC_DIV_CON_WIDTH);
438 return DIV_TO_RATE(OSC_HZ, div);
441 static ulong rk3368_saradc_set_clk(struct rk3368_cru *cru, uint hz)
445 src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
446 assert(src_clk_div < 128);
448 rk_clrsetreg(&cru->clksel_con[25],
449 CLK_SARADC_DIV_CON_MASK,
450 src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
452 return rk3368_saradc_get_clk(cru);
455 static ulong rk3368_clk_get_rate(struct clk *clk)
457 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
460 debug("%s: id %ld\n", __func__, clk->id);
463 rate = rkclk_pll_get_rate(priv->cru, CPLL);
466 rate = rkclk_pll_get_rate(priv->cru, GPLL);
468 case SCLK_SPI0 ... SCLK_SPI2:
469 rate = rk3368_spi_get_clk(priv->cru, clk->id);
471 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
474 rate = rk3368_mmc_get_clk(priv->cru, clk->id);
478 rate = rk3368_saradc_get_clk(priv->cru);
487 static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
489 __maybe_unused struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
492 debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate);
494 case SCLK_SPI0 ... SCLK_SPI2:
495 ret = rk3368_spi_set_clk(priv->cru, clk->id, rate);
497 #if IS_ENABLED(CONFIG_TPL_BUILD)
499 ret = rk3368_ddr_set_clk(priv->cru, rate);
502 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
505 ret = rk3368_mmc_set_clk(clk, rate);
508 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
510 /* select the external clock */
511 ret = rk3368_gmac_set_clk(priv->cru, rate);
515 ret = rk3368_saradc_set_clk(priv->cru, rate);
524 static int __maybe_unused rk3368_gmac_set_parent(struct clk *clk, struct clk *parent)
526 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
527 struct rk3368_cru *cru = priv->cru;
528 const char *clock_output_name;
532 * If the requested parent is in the same clock-controller and
533 * the id is SCLK_MAC ("sclk_mac"), switch to the internal
536 if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC)) {
537 debug("%s: switching GAMC to SCLK_MAC\n", __func__);
538 rk_clrreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
543 * Otherwise, we need to check the clock-output-names of the
544 * requested parent to see if the requested id is "ext_gmac".
546 ret = dev_read_string_index(parent->dev, "clock-output-names",
547 parent->id, &clock_output_name);
551 /* If this is "ext_gmac", switch to the external clock input */
552 if (!strcmp(clock_output_name, "ext_gmac")) {
553 debug("%s: switching GMAC to external clock\n", __func__);
554 rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
561 static int __maybe_unused rk3368_clk_set_parent(struct clk *clk, struct clk *parent)
565 return rk3368_gmac_set_parent(clk, parent);
568 debug("%s: unsupported clk %ld\n", __func__, clk->id);
572 static struct clk_ops rk3368_clk_ops = {
573 .get_rate = rk3368_clk_get_rate,
574 .set_rate = rk3368_clk_set_rate,
575 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
576 .set_parent = rk3368_clk_set_parent,
580 static int rk3368_clk_probe(struct udevice *dev)
582 struct rk3368_clk_priv __maybe_unused *priv = dev_get_priv(dev);
583 #if CONFIG_IS_ENABLED(OF_PLATDATA)
584 struct rk3368_clk_plat *plat = dev_get_platdata(dev);
586 priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
588 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
589 rkclk_init(priv->cru);
595 static int rk3368_clk_ofdata_to_platdata(struct udevice *dev)
597 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
598 struct rk3368_clk_priv *priv = dev_get_priv(dev);
600 priv->cru = dev_read_addr_ptr(dev);
606 static int rk3368_clk_bind(struct udevice *dev)
609 struct udevice *sys_child;
610 struct sysreset_reg *priv;
612 /* The reset driver does not have a device node, so bind it here */
613 ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
616 debug("Warning: No sysreset driver: ret=%d\n", ret);
618 priv = malloc(sizeof(struct sysreset_reg));
619 priv->glb_srst_fst_value = offsetof(struct rk3368_cru,
621 priv->glb_srst_snd_value = offsetof(struct rk3368_cru,
623 sys_child->priv = priv;
626 #if CONFIG_IS_ENABLED(RESET_ROCKCHIP)
627 ret = offsetof(struct rk3368_cru, softrst_con[0]);
628 ret = rockchip_reset_bind(dev, ret, 15);
630 debug("Warning: software reset driver bind faile\n");
636 static const struct udevice_id rk3368_clk_ids[] = {
637 { .compatible = "rockchip,rk3368-cru" },
641 U_BOOT_DRIVER(rockchip_rk3368_cru) = {
642 .name = "rockchip_rk3368_cru",
644 .of_match = rk3368_clk_ids,
645 .priv_auto_alloc_size = sizeof(struct rk3368_clk_priv),
646 #if CONFIG_IS_ENABLED(OF_PLATDATA)
647 .platdata_auto_alloc_size = sizeof(struct rk3368_clk_plat),
649 .ofdata_to_platdata = rk3368_clk_ofdata_to_platdata,
650 .ops = &rk3368_clk_ops,
651 .bind = rk3368_clk_bind,
652 .probe = rk3368_clk_probe,