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>
17 #include <asm/arch-rockchip/clock.h>
18 #include <asm/arch-rockchip/cru_rk3368.h>
19 #include <asm/arch-rockchip/hardware.h>
22 #include <dt-bindings/clock/rk3368-cru.h>
24 #if CONFIG_IS_ENABLED(OF_PLATDATA)
25 struct rk3368_clk_plat {
26 struct dtd_rockchip_rk3368_cru dtd;
36 #define OSC_HZ (24 * 1000 * 1000)
37 #define APLL_L_HZ (800 * 1000 * 1000)
38 #define APLL_B_HZ (816 * 1000 * 1000)
39 #define GPLL_HZ (576 * 1000 * 1000)
40 #define CPLL_HZ (400 * 1000 * 1000)
42 #define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
44 #define PLL_DIVISORS(hz, _nr, _no) { \
45 .nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no}; \
46 _Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
47 (_nr * _no) == hz, #hz "Hz cannot be hit with PLL " \
48 "divisors on line " __stringify(__LINE__));
50 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
51 static const struct pll_div apll_l_init_cfg = PLL_DIVISORS(APLL_L_HZ, 12, 2);
52 static const struct pll_div apll_b_init_cfg = PLL_DIVISORS(APLL_B_HZ, 1, 2);
53 #if !defined(CONFIG_TPL_BUILD)
54 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 2);
55 static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 6);
59 static ulong rk3368_clk_get_rate(struct clk *clk);
61 /* Get pll rate by id */
62 static uint32_t rkclk_pll_get_rate(struct rk3368_cru *cru,
63 enum rk3368_pll_id pll_id)
67 struct rk3368_pll *pll = &cru->pll[pll_id];
69 con = readl(&pll->con3);
71 switch ((con & PLL_MODE_MASK) >> PLL_MODE_SHIFT) {
75 con = readl(&pll->con0);
76 no = ((con & PLL_OD_MASK) >> PLL_OD_SHIFT) + 1;
77 nr = ((con & PLL_NR_MASK) >> PLL_NR_SHIFT) + 1;
78 con = readl(&pll->con1);
79 nf = ((con & PLL_NF_MASK) >> PLL_NF_SHIFT) + 1;
81 return (24 * nf / (nr * no)) * 1000000;
82 case PLL_MODE_DEEP_SLOW:
88 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
89 static int rkclk_set_pll(struct rk3368_cru *cru, enum rk3368_pll_id pll_id,
90 const struct pll_div *div)
92 struct rk3368_pll *pll = &cru->pll[pll_id];
93 /* All PLLs have same VCO and output frequency range restrictions*/
94 uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
95 uint output_hz = vco_hz / div->no;
97 debug("PLL at %p: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n",
98 pll, div->nf, div->nr, div->no, vco_hz, output_hz);
100 /* enter slow mode and reset pll */
101 rk_clrsetreg(&pll->con3, PLL_MODE_MASK | PLL_RESET_MASK,
102 PLL_RESET << PLL_RESET_SHIFT);
104 rk_clrsetreg(&pll->con0, PLL_NR_MASK | PLL_OD_MASK,
105 ((div->nr - 1) << PLL_NR_SHIFT) |
106 ((div->no - 1) << PLL_OD_SHIFT));
107 writel((div->nf - 1) << PLL_NF_SHIFT, &pll->con1);
109 * BWADJ should be set to NF / 2 to ensure the nominal bandwidth.
110 * Compare the RK3368 TRM, section "3.6.4 PLL Bandwidth Adjustment".
112 clrsetbits_le32(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);
116 /* return from reset */
117 rk_clrreg(&pll->con3, PLL_RESET_MASK);
119 /* waiting for pll lock */
120 while (!(readl(&pll->con1) & PLL_LOCK_STA))
123 rk_clrsetreg(&pll->con3, PLL_MODE_MASK,
124 PLL_MODE_NORMAL << PLL_MODE_SHIFT);
130 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
131 static void rkclk_init(struct rk3368_cru *cru)
133 u32 apllb, aplll, dpll, cpll, gpll;
135 rkclk_set_pll(cru, APLLB, &apll_b_init_cfg);
136 rkclk_set_pll(cru, APLLL, &apll_l_init_cfg);
137 #if !defined(CONFIG_TPL_BUILD)
139 * If we plan to return to the boot ROM, we can't increase the
140 * GPLL rate from the SPL stage.
142 rkclk_set_pll(cru, GPLL, &gpll_init_cfg);
143 rkclk_set_pll(cru, CPLL, &cpll_init_cfg);
146 apllb = rkclk_pll_get_rate(cru, APLLB);
147 aplll = rkclk_pll_get_rate(cru, APLLL);
148 dpll = rkclk_pll_get_rate(cru, DPLL);
149 cpll = rkclk_pll_get_rate(cru, CPLL);
150 gpll = rkclk_pll_get_rate(cru, GPLL);
152 debug("%s apllb(%d) apll(%d) dpll(%d) cpll(%d) gpll(%d)\n",
153 __func__, apllb, aplll, dpll, cpll, gpll);
157 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
158 static ulong rk3368_mmc_get_clk(struct rk3368_cru *cru, uint clk_id)
160 u32 div, con, con_id, rate;
177 con = readl(&cru->clksel_con[con_id]);
178 switch (con & MMC_PLL_SEL_MASK) {
179 case MMC_PLL_SEL_GPLL:
180 pll_rate = rkclk_pll_get_rate(cru, GPLL);
182 case MMC_PLL_SEL_24M:
185 case MMC_PLL_SEL_CPLL:
186 pll_rate = rkclk_pll_get_rate(cru, CPLL);
188 case MMC_PLL_SEL_USBPHY_480M:
192 div = (con & MMC_CLK_DIV_MASK) >> MMC_CLK_DIV_SHIFT;
193 rate = DIV_TO_RATE(pll_rate, div);
195 debug("%s: raw rate %d (post-divide by 2)\n", __func__, rate);
199 static ulong rk3368_mmc_find_best_rate_and_parent(struct clk *clk,
206 const ulong MHz = 1000000;
211 { .mux = MMC_PLL_SEL_CPLL, .rate = CPLL_HZ },
212 { .mux = MMC_PLL_SEL_GPLL, .rate = GPLL_HZ },
213 { .mux = MMC_PLL_SEL_24M, .rate = 24 * MHz }
216 debug("%s: target rate %ld\n", __func__, rate);
217 for (i = 0; i < ARRAY_SIZE(parents); ++i) {
219 * Find the largest rate no larger than the target-rate for
220 * the current parent.
222 ulong parent_rate = parents[i].rate;
223 u32 div = DIV_ROUND_UP(parent_rate, rate);
225 ulong new_rate = parent_rate / adj_div;
227 debug("%s: rate %ld, parent-mux %d, parent-rate %ld, div %d\n",
228 __func__, rate, parents[i].mux, parents[i].rate, div);
230 /* Skip, if not representable */
231 if ((div - 1) > MMC_CLK_DIV_MASK)
234 /* Skip, if we already have a better (or equal) solution */
235 if (new_rate <= best_rate)
238 /* This is our new best rate. */
239 best_rate = new_rate;
240 *best_mux = parents[i].mux;
244 debug("%s: best_mux = %x, best_div = %d, best_rate = %ld\n",
245 __func__, *best_mux, *best_div, best_rate);
250 static ulong rk3368_mmc_set_clk(struct clk *clk, ulong rate)
252 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
253 struct rk3368_cru *cru = priv->cru;
254 ulong clk_id = clk->id;
255 u32 con_id, mux = 0, div = 0;
257 /* Find the best parent and rate */
258 rk3368_mmc_find_best_rate_and_parent(clk, rate << 1, &mux, &div);
274 rk_clrsetreg(&cru->clksel_con[con_id],
275 MMC_PLL_SEL_MASK | MMC_CLK_DIV_MASK,
278 return rk3368_mmc_get_clk(cru, clk_id);
282 #if IS_ENABLED(CONFIG_TPL_BUILD)
283 static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate)
285 const struct pll_div *dpll_cfg = NULL;
286 const ulong MHz = 1000000;
288 /* Fout = ((Fin /NR) * NF )/ NO */
289 static const struct pll_div dpll_1200 = PLL_DIVISORS(1200 * MHz, 1, 1);
290 static const struct pll_div dpll_1332 = PLL_DIVISORS(1332 * MHz, 2, 1);
291 static const struct pll_div dpll_1600 = PLL_DIVISORS(1600 * MHz, 3, 2);
295 dpll_cfg = &dpll_1200;
298 dpll_cfg = &dpll_1332;
301 dpll_cfg = &dpll_1600;
304 pr_err("Unsupported SDRAM frequency!,%ld\n", set_rate);
306 rkclk_set_pll(cru, DPLL, dpll_cfg);
312 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
313 static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru, ulong set_rate)
318 * The gmac clock can be derived either from an external clock
319 * or can be generated from internally by a divider from SCLK_MAC.
321 if (readl(&cru->clksel_con[43]) & GMAC_MUX_SEL_EXTCLK) {
322 /* An external clock will always generate the right rate... */
325 u32 con = readl(&cru->clksel_con[43]);
329 if (((con >> GMAC_PLL_SHIFT) & GMAC_PLL_MASK) ==
330 GMAC_PLL_SELECT_GENERAL)
332 else if (((con >> GMAC_PLL_SHIFT) & GMAC_PLL_MASK) ==
333 GMAC_PLL_SELECT_CODEC)
336 /* CPLL is not set */
339 div = DIV_ROUND_UP(pll_rate, set_rate) - 1;
341 rk_clrsetreg(&cru->clksel_con[43], GMAC_DIV_CON_MASK,
342 div << GMAC_DIV_CON_SHIFT);
344 debug("Unsupported div for gmac:%d\n", div);
346 return DIV_TO_RATE(pll_rate, div);
354 * RK3368 SPI clocks have a common divider-width (7 bits) and a single bit
355 * to select either CPLL or GPLL as the clock-parent. The location within
356 * the enclosing CLKSEL_CON (i.e. div_shift and sel_shift) are variable.
360 uint8_t reg; /* CLKSEL_CON[reg] register in CRU */
366 * The entries are numbered relative to their offset from SCLK_SPI0.
368 static const struct spi_clkreg spi_clkregs[] = {
369 [0] = { .reg = 45, .div_shift = 0, .sel_shift = 7, },
370 [1] = { .reg = 45, .div_shift = 8, .sel_shift = 15, },
371 [2] = { .reg = 46, .div_shift = 8, .sel_shift = 15, },
374 static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
376 return (val >> shift) & ((1 << width) - 1);
379 static ulong rk3368_spi_get_clk(struct rk3368_cru *cru, ulong clk_id)
381 const struct spi_clkreg *spiclk = NULL;
385 case SCLK_SPI0 ... SCLK_SPI2:
386 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
390 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
394 val = readl(&cru->clksel_con[spiclk->reg]);
395 div = extract_bits(val, 7, spiclk->div_shift);
397 debug("%s: div 0x%x\n", __func__, div);
398 return DIV_TO_RATE(GPLL_HZ, div);
401 static ulong rk3368_spi_set_clk(struct rk3368_cru *cru, ulong clk_id, uint hz)
403 const struct spi_clkreg *spiclk = NULL;
406 src_clk_div = DIV_ROUND_UP(GPLL_HZ, hz);
407 assert(src_clk_div < 127);
410 case SCLK_SPI0 ... SCLK_SPI2:
411 spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
415 pr_err("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
419 rk_clrsetreg(&cru->clksel_con[spiclk->reg],
420 ((0x7f << spiclk->div_shift) |
421 (0x1 << spiclk->sel_shift)),
422 ((src_clk_div << spiclk->div_shift) |
423 (1 << spiclk->sel_shift)));
425 return rk3368_spi_get_clk(cru, clk_id);
428 static ulong rk3368_saradc_get_clk(struct rk3368_cru *cru)
432 val = readl(&cru->clksel_con[25]);
433 div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT,
434 CLK_SARADC_DIV_CON_WIDTH);
436 return DIV_TO_RATE(OSC_HZ, div);
439 static ulong rk3368_saradc_set_clk(struct rk3368_cru *cru, uint hz)
443 src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
444 assert(src_clk_div < 128);
446 rk_clrsetreg(&cru->clksel_con[25],
447 CLK_SARADC_DIV_CON_MASK,
448 src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
450 return rk3368_saradc_get_clk(cru);
453 static ulong rk3368_clk_get_rate(struct clk *clk)
455 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
458 debug("%s: id %ld\n", __func__, clk->id);
461 rate = rkclk_pll_get_rate(priv->cru, CPLL);
464 rate = rkclk_pll_get_rate(priv->cru, GPLL);
466 case SCLK_SPI0 ... SCLK_SPI2:
467 rate = rk3368_spi_get_clk(priv->cru, clk->id);
469 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
472 rate = rk3368_mmc_get_clk(priv->cru, clk->id);
476 rate = rk3368_saradc_get_clk(priv->cru);
485 static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
487 __maybe_unused struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
490 debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate);
492 case SCLK_SPI0 ... SCLK_SPI2:
493 ret = rk3368_spi_set_clk(priv->cru, clk->id, rate);
495 #if IS_ENABLED(CONFIG_TPL_BUILD)
497 ret = rk3368_ddr_set_clk(priv->cru, rate);
500 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
503 ret = rk3368_mmc_set_clk(clk, rate);
506 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
508 /* select the external clock */
509 ret = rk3368_gmac_set_clk(priv->cru, rate);
513 ret = rk3368_saradc_set_clk(priv->cru, rate);
522 static int __maybe_unused rk3368_gmac_set_parent(struct clk *clk, struct clk *parent)
524 struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
525 struct rk3368_cru *cru = priv->cru;
526 const char *clock_output_name;
530 * If the requested parent is in the same clock-controller and
531 * the id is SCLK_MAC ("sclk_mac"), switch to the internal
534 if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC)) {
535 debug("%s: switching GAMC to SCLK_MAC\n", __func__);
536 rk_clrreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
541 * Otherwise, we need to check the clock-output-names of the
542 * requested parent to see if the requested id is "ext_gmac".
544 ret = dev_read_string_index(parent->dev, "clock-output-names",
545 parent->id, &clock_output_name);
549 /* If this is "ext_gmac", switch to the external clock input */
550 if (!strcmp(clock_output_name, "ext_gmac")) {
551 debug("%s: switching GMAC to external clock\n", __func__);
552 rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
559 static int __maybe_unused rk3368_clk_set_parent(struct clk *clk, struct clk *parent)
563 return rk3368_gmac_set_parent(clk, parent);
566 debug("%s: unsupported clk %ld\n", __func__, clk->id);
570 static struct clk_ops rk3368_clk_ops = {
571 .get_rate = rk3368_clk_get_rate,
572 .set_rate = rk3368_clk_set_rate,
573 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
574 .set_parent = rk3368_clk_set_parent,
578 static int rk3368_clk_probe(struct udevice *dev)
580 struct rk3368_clk_priv __maybe_unused *priv = dev_get_priv(dev);
581 #if CONFIG_IS_ENABLED(OF_PLATDATA)
582 struct rk3368_clk_plat *plat = dev_get_platdata(dev);
584 priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
586 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
587 rkclk_init(priv->cru);
593 static int rk3368_clk_ofdata_to_platdata(struct udevice *dev)
595 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
596 struct rk3368_clk_priv *priv = dev_get_priv(dev);
598 priv->cru = dev_read_addr_ptr(dev);
604 static int rk3368_clk_bind(struct udevice *dev)
607 struct udevice *sys_child;
608 struct sysreset_reg *priv;
610 /* The reset driver does not have a device node, so bind it here */
611 ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
614 debug("Warning: No sysreset driver: ret=%d\n", ret);
616 priv = malloc(sizeof(struct sysreset_reg));
617 priv->glb_srst_fst_value = offsetof(struct rk3368_cru,
619 priv->glb_srst_snd_value = offsetof(struct rk3368_cru,
621 sys_child->priv = priv;
624 #if CONFIG_IS_ENABLED(RESET_ROCKCHIP)
625 ret = offsetof(struct rk3368_cru, softrst_con[0]);
626 ret = rockchip_reset_bind(dev, ret, 15);
628 debug("Warning: software reset driver bind faile\n");
634 static const struct udevice_id rk3368_clk_ids[] = {
635 { .compatible = "rockchip,rk3368-cru" },
639 U_BOOT_DRIVER(rockchip_rk3368_cru) = {
640 .name = "rockchip_rk3368_cru",
642 .of_match = rk3368_clk_ids,
643 .priv_auto_alloc_size = sizeof(struct rk3368_clk_priv),
644 #if CONFIG_IS_ENABLED(OF_PLATDATA)
645 .platdata_auto_alloc_size = sizeof(struct rk3368_clk_plat),
647 .ofdata_to_platdata = rk3368_clk_ofdata_to_platdata,
648 .ops = &rk3368_clk_ops,
649 .bind = rk3368_clk_bind,
650 .probe = rk3368_clk_probe,