1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2015 Google, Inc
7 #include <clk-uclass.h>
12 #include <asm/arch-rockchip/clock.h>
13 #include <asm/arch-rockchip/cru_rk3036.h>
14 #include <asm/arch-rockchip/hardware.h>
16 #include <dt-bindings/clock/rk3036-cru.h>
17 #include <linux/log2.h>
20 VCO_MAX_HZ = 2400U * 1000000,
21 VCO_MIN_HZ = 600 * 1000000,
22 OUTPUT_MAX_HZ = 2400U * 1000000,
23 OUTPUT_MIN_HZ = 24 * 1000000,
26 #define RATE_TO_DIV(input_rate, output_rate) \
27 ((input_rate) / (output_rate) - 1);
29 #define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
31 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
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__));
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);
44 static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
45 const struct pll_div *div)
47 int pll_id = rk_pll_id(clk_id);
48 struct rk3036_pll *pll = &cru->pll[pll_id];
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;
54 debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
55 vco=%u Hz, output=%u Hz\n",
56 pll, div->fbdiv, div->refdiv, div->postdiv1,
57 div->postdiv2, vco_hz, output_hz);
58 assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
59 output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
61 /* use integer mode */
62 rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
64 rk_clrsetreg(&pll->con0,
65 PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
66 (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
67 rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
68 (div->postdiv2 << PLL_POSTDIV2_SHIFT |
69 div->refdiv << PLL_REFDIV_SHIFT));
71 /* waiting for pll lock */
72 while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
78 static void rkclk_init(struct rk3036_cru *cru)
84 /* pll enter slow-mode */
85 rk_clrsetreg(&cru->cru_mode_con,
86 GPLL_MODE_MASK | APLL_MODE_MASK,
87 GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
88 APLL_MODE_SLOW << APLL_MODE_SHIFT);
91 rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
92 rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
95 * select apll as cpu/core clock pll source and
96 * set up dependent divisors for PERI and ACLK clocks.
97 * core hz : apll = 1:1
99 aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
100 assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
102 pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
103 assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
105 rk_clrsetreg(&cru->cru_clksel_con[0],
106 CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
107 CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
108 0 << CORE_DIV_CON_SHIFT);
110 rk_clrsetreg(&cru->cru_clksel_con[1],
111 CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
112 aclk_div << CORE_ACLK_DIV_SHIFT |
113 pclk_div << CORE_PERI_DIV_SHIFT);
116 * select apll as pd_bus bus clock source and
117 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
119 aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
120 assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
122 pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
123 assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
125 hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
126 assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
128 rk_clrsetreg(&cru->cru_clksel_con[0],
129 BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
130 BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
131 aclk_div << BUS_ACLK_DIV_SHIFT);
133 rk_clrsetreg(&cru->cru_clksel_con[1],
134 BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
135 pclk_div << BUS_PCLK_DIV_SHIFT |
136 hclk_div << BUS_HCLK_DIV_SHIFT);
139 * select gpll as pd_peri bus clock source and
140 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
142 aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
143 assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
145 hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
146 assert((1 << hclk_div) * PERI_HCLK_HZ ==
147 PERI_ACLK_HZ && (hclk_div < 0x4));
149 pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
150 assert((1 << pclk_div) * PERI_PCLK_HZ ==
151 PERI_ACLK_HZ && pclk_div < 0x8);
153 rk_clrsetreg(&cru->cru_clksel_con[10],
154 PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
155 PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
156 PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
157 pclk_div << PERI_PCLK_DIV_SHIFT |
158 hclk_div << PERI_HCLK_DIV_SHIFT |
159 aclk_div << PERI_ACLK_DIV_SHIFT);
161 /* PLL enter normal-mode */
162 rk_clrsetreg(&cru->cru_mode_con,
163 GPLL_MODE_MASK | APLL_MODE_MASK,
164 GPLL_MODE_NORM << GPLL_MODE_SHIFT |
165 APLL_MODE_NORM << APLL_MODE_SHIFT);
168 /* Get pll rate by id */
169 static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
170 enum rk_clk_id clk_id)
172 uint32_t refdiv, fbdiv, postdiv1, postdiv2;
174 int pll_id = rk_pll_id(clk_id);
175 struct rk3036_pll *pll = &cru->pll[pll_id];
176 static u8 clk_shift[CLK_COUNT] = {
177 0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
178 GPLL_MODE_SHIFT, 0xff
180 static u32 clk_mask[CLK_COUNT] = {
181 0xffffffff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xffffffff,
182 GPLL_MODE_MASK, 0xffffffff
187 con = readl(&cru->cru_mode_con);
188 shift = clk_shift[clk_id];
189 mask = clk_mask[clk_id];
191 switch ((con & mask) >> shift) {
197 con = readl(&pll->con0);
198 postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
199 fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
200 con = readl(&pll->con1);
201 postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
202 refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
203 return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
210 static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
220 con = readl(&cru->cru_clksel_con[12]);
221 mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
222 div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
226 con = readl(&cru->cru_clksel_con[12]);
227 mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
228 div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
234 src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
235 return DIV_TO_RATE(src_rate, div) / 2;
238 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
239 int periph, uint freq)
244 debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
246 /* mmc clock auto divide 2 in internal */
247 src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
249 if (src_clk_div > 128) {
250 src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
251 assert(src_clk_div - 1 < 128);
260 rk_clrsetreg(&cru->cru_clksel_con[12],
261 EMMC_PLL_MASK | EMMC_DIV_MASK,
262 mux << EMMC_PLL_SHIFT |
263 (src_clk_div - 1) << EMMC_DIV_SHIFT);
267 rk_clrsetreg(&cru->cru_clksel_con[11],
268 MMC0_PLL_MASK | MMC0_DIV_MASK,
269 mux << MMC0_PLL_SHIFT |
270 (src_clk_div - 1) << MMC0_DIV_SHIFT);
276 return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
279 static ulong rk3036_clk_get_rate(struct clk *clk)
281 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
285 return rkclk_pll_get_rate(priv->cru, clk->id);
291 static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
293 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
294 ulong new_rate, gclk_rate;
296 gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
302 new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
312 static struct clk_ops rk3036_clk_ops = {
313 .get_rate = rk3036_clk_get_rate,
314 .set_rate = rk3036_clk_set_rate,
317 static int rk3036_clk_ofdata_to_platdata(struct udevice *dev)
319 struct rk3036_clk_priv *priv = dev_get_priv(dev);
321 priv->cru = dev_read_addr_ptr(dev);
326 static int rk3036_clk_probe(struct udevice *dev)
328 struct rk3036_clk_priv *priv = dev_get_priv(dev);
330 rkclk_init(priv->cru);
335 static int rk3036_clk_bind(struct udevice *dev)
338 struct udevice *sys_child;
339 struct sysreset_reg *priv;
341 /* The reset driver does not have a device node, so bind it here */
342 ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
345 debug("Warning: No sysreset driver: ret=%d\n", ret);
347 priv = malloc(sizeof(struct sysreset_reg));
348 priv->glb_srst_fst_value = offsetof(struct rk3036_cru,
349 cru_glb_srst_fst_value);
350 priv->glb_srst_snd_value = offsetof(struct rk3036_cru,
351 cru_glb_srst_snd_value);
352 sys_child->priv = priv;
355 #if CONFIG_IS_ENABLED(CONFIG_RESET_ROCKCHIP)
356 ret = offsetof(struct rk3036_cru, cru_softrst_con[0]);
357 ret = rockchip_reset_bind(dev, ret, 9);
359 debug("Warning: software reset driver bind faile\n");
365 static const struct udevice_id rk3036_clk_ids[] = {
366 { .compatible = "rockchip,rk3036-cru" },
370 U_BOOT_DRIVER(rockchip_rk3036_cru) = {
371 .name = "clk_rk3036",
373 .of_match = rk3036_clk_ids,
374 .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
375 .ofdata_to_platdata = rk3036_clk_ofdata_to_platdata,
376 .ops = &rk3036_clk_ops,
377 .bind = rk3036_clk_bind,
378 .probe = rk3036_clk_probe,