1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2015 Google, Inc
7 #include <clk-uclass.h>
14 #include <asm/arch-rockchip/clock.h>
15 #include <asm/arch-rockchip/cru_rk3036.h>
16 #include <asm/arch-rockchip/hardware.h>
18 #include <dt-bindings/clock/rk3036-cru.h>
19 #include <linux/delay.h>
20 #include <linux/log2.h>
21 #include <linux/stringify.h>
24 VCO_MAX_HZ = 2400U * 1000000,
25 VCO_MIN_HZ = 600 * 1000000,
26 OUTPUT_MAX_HZ = 2400U * 1000000,
27 OUTPUT_MIN_HZ = 24 * 1000000,
30 #define RATE_TO_DIV(input_rate, output_rate) \
31 ((input_rate) / (output_rate) - 1);
33 #define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
35 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
37 .fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
38 .postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
39 _Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
40 OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
41 #hz "Hz cannot be hit with PLL "\
42 "divisors on line " __stringify(__LINE__));
45 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
46 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
48 static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
49 const struct pll_div *div)
51 int pll_id = rk_pll_id(clk_id);
52 struct rk3036_pll *pll = &cru->pll[pll_id];
54 /* All PLLs have same VCO and output frequency range restrictions. */
55 uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
56 uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
58 debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
59 vco=%u Hz, output=%u Hz\n",
60 pll, div->fbdiv, div->refdiv, div->postdiv1,
61 div->postdiv2, vco_hz, output_hz);
62 assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
63 output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
65 /* use integer mode */
66 rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
68 rk_clrsetreg(&pll->con0,
69 PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
70 (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
71 rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
72 (div->postdiv2 << PLL_POSTDIV2_SHIFT |
73 div->refdiv << PLL_REFDIV_SHIFT));
75 /* waiting for pll lock */
76 while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
82 static void rkclk_init(struct rk3036_cru *cru)
88 /* pll enter slow-mode */
89 rk_clrsetreg(&cru->cru_mode_con,
90 GPLL_MODE_MASK | APLL_MODE_MASK,
91 GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
92 APLL_MODE_SLOW << APLL_MODE_SHIFT);
95 rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
96 rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
99 * select apll as cpu/core clock pll source and
100 * set up dependent divisors for PERI and ACLK clocks.
101 * core hz : apll = 1:1
103 aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
104 assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
106 pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
107 assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
109 rk_clrsetreg(&cru->cru_clksel_con[0],
110 CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
111 CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
112 0 << CORE_DIV_CON_SHIFT);
114 rk_clrsetreg(&cru->cru_clksel_con[1],
115 CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
116 aclk_div << CORE_ACLK_DIV_SHIFT |
117 pclk_div << CORE_PERI_DIV_SHIFT);
120 * select apll as pd_bus bus clock source and
121 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
123 aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
124 assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
126 pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
127 assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
129 hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
130 assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
132 rk_clrsetreg(&cru->cru_clksel_con[0],
133 BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
134 BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
135 aclk_div << BUS_ACLK_DIV_SHIFT);
137 rk_clrsetreg(&cru->cru_clksel_con[1],
138 BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
139 pclk_div << BUS_PCLK_DIV_SHIFT |
140 hclk_div << BUS_HCLK_DIV_SHIFT);
143 * select gpll as pd_peri bus clock source and
144 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
146 aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
147 assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
149 hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
150 assert((1 << hclk_div) * PERI_HCLK_HZ ==
151 PERI_ACLK_HZ && (hclk_div < 0x4));
153 pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
154 assert((1 << pclk_div) * PERI_PCLK_HZ ==
155 PERI_ACLK_HZ && pclk_div < 0x8);
157 rk_clrsetreg(&cru->cru_clksel_con[10],
158 PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
159 PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
160 PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
161 pclk_div << PERI_PCLK_DIV_SHIFT |
162 hclk_div << PERI_HCLK_DIV_SHIFT |
163 aclk_div << PERI_ACLK_DIV_SHIFT);
165 /* PLL enter normal-mode */
166 rk_clrsetreg(&cru->cru_mode_con,
167 GPLL_MODE_MASK | APLL_MODE_MASK,
168 GPLL_MODE_NORM << GPLL_MODE_SHIFT |
169 APLL_MODE_NORM << APLL_MODE_SHIFT);
172 /* Get pll rate by id */
173 static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
174 enum rk_clk_id clk_id)
176 uint32_t refdiv, fbdiv, postdiv1, postdiv2;
178 int pll_id = rk_pll_id(clk_id);
179 struct rk3036_pll *pll = &cru->pll[pll_id];
180 static u8 clk_shift[CLK_COUNT] = {
181 0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
182 GPLL_MODE_SHIFT, 0xff
184 static u32 clk_mask[CLK_COUNT] = {
185 0xffffffff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xffffffff,
186 GPLL_MODE_MASK, 0xffffffff
191 con = readl(&cru->cru_mode_con);
192 shift = clk_shift[clk_id];
193 mask = clk_mask[clk_id];
195 switch ((con & mask) >> shift) {
201 con = readl(&pll->con0);
202 postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
203 fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
204 con = readl(&pll->con1);
205 postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
206 refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
207 return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
214 static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
224 con = readl(&cru->cru_clksel_con[12]);
225 mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
226 div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
230 con = readl(&cru->cru_clksel_con[12]);
231 mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
232 div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
238 src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
239 return DIV_TO_RATE(src_rate, div) / 2;
242 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
243 int periph, uint freq)
248 debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
250 /* mmc clock auto divide 2 in internal */
251 src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
253 if (src_clk_div > 128) {
254 src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
255 assert(src_clk_div - 1 < 128);
264 rk_clrsetreg(&cru->cru_clksel_con[12],
265 EMMC_PLL_MASK | EMMC_DIV_MASK,
266 mux << EMMC_PLL_SHIFT |
267 (src_clk_div - 1) << EMMC_DIV_SHIFT);
271 rk_clrsetreg(&cru->cru_clksel_con[11],
272 MMC0_PLL_MASK | MMC0_DIV_MASK,
273 mux << MMC0_PLL_SHIFT |
274 (src_clk_div - 1) << MMC0_DIV_SHIFT);
280 return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
283 static ulong rk3036_clk_get_rate(struct clk *clk)
285 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
289 return rkclk_pll_get_rate(priv->cru, clk->id);
295 static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
297 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
298 ulong new_rate, gclk_rate;
300 gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
306 new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
316 static struct clk_ops rk3036_clk_ops = {
317 .get_rate = rk3036_clk_get_rate,
318 .set_rate = rk3036_clk_set_rate,
321 static int rk3036_clk_ofdata_to_platdata(struct udevice *dev)
323 struct rk3036_clk_priv *priv = dev_get_priv(dev);
325 priv->cru = dev_read_addr_ptr(dev);
330 static int rk3036_clk_probe(struct udevice *dev)
332 struct rk3036_clk_priv *priv = dev_get_priv(dev);
334 rkclk_init(priv->cru);
339 static int rk3036_clk_bind(struct udevice *dev)
342 struct udevice *sys_child;
343 struct sysreset_reg *priv;
345 /* The reset driver does not have a device node, so bind it here */
346 ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
349 debug("Warning: No sysreset driver: ret=%d\n", ret);
351 priv = malloc(sizeof(struct sysreset_reg));
352 priv->glb_srst_fst_value = offsetof(struct rk3036_cru,
353 cru_glb_srst_fst_value);
354 priv->glb_srst_snd_value = offsetof(struct rk3036_cru,
355 cru_glb_srst_snd_value);
356 sys_child->priv = priv;
359 #if CONFIG_IS_ENABLED(RESET_ROCKCHIP)
360 ret = offsetof(struct rk3036_cru, cru_softrst_con[0]);
361 ret = rockchip_reset_bind(dev, ret, 9);
363 debug("Warning: software reset driver bind faile\n");
369 static const struct udevice_id rk3036_clk_ids[] = {
370 { .compatible = "rockchip,rk3036-cru" },
374 U_BOOT_DRIVER(rockchip_rk3036_cru) = {
375 .name = "clk_rk3036",
377 .of_match = rk3036_clk_ids,
378 .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
379 .ofdata_to_platdata = rk3036_clk_ofdata_to_platdata,
380 .ops = &rk3036_clk_ops,
381 .bind = rk3036_clk_bind,
382 .probe = rk3036_clk_probe,