2 * (C) Copyright 2015 Google, Inc
4 * SPDX-License-Identifier: GPL-2.0
8 #include <clk-uclass.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/cru_rk3036.h>
15 #include <asm/arch/hardware.h>
17 #include <dt-bindings/clock/rk3036-cru.h>
18 #include <linux/log2.h>
20 DECLARE_GLOBAL_DATA_PTR;
23 VCO_MAX_HZ = 2400U * 1000000,
24 VCO_MIN_HZ = 600 * 1000000,
25 OUTPUT_MAX_HZ = 2400U * 1000000,
26 OUTPUT_MIN_HZ = 24 * 1000000,
29 #define RATE_TO_DIV(input_rate, output_rate) \
30 ((input_rate) / (output_rate) - 1);
32 #define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
34 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
36 .fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
37 .postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
38 _Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
39 OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
40 #hz "Hz cannot be hit with PLL "\
41 "divisors on line " __stringify(__LINE__));
44 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
45 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
47 static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
48 const struct pll_div *div)
50 int pll_id = rk_pll_id(clk_id);
51 struct rk3036_pll *pll = &cru->pll[pll_id];
53 /* All PLLs have same VCO and output frequency range restrictions. */
54 uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
55 uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
57 debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
58 vco=%u Hz, output=%u Hz\n",
59 pll, div->fbdiv, div->refdiv, div->postdiv1,
60 div->postdiv2, vco_hz, output_hz);
61 assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
62 output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
64 /* use integer mode */
65 rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
67 rk_clrsetreg(&pll->con0,
68 PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
69 (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
70 rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
71 (div->postdiv2 << PLL_POSTDIV2_SHIFT |
72 div->refdiv << PLL_REFDIV_SHIFT));
74 /* waiting for pll lock */
75 while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
81 static void rkclk_init(struct rk3036_cru *cru)
87 /* pll enter slow-mode */
88 rk_clrsetreg(&cru->cru_mode_con,
89 GPLL_MODE_MASK | APLL_MODE_MASK,
90 GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
91 APLL_MODE_SLOW << APLL_MODE_SHIFT);
94 rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
95 rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
98 * select apll as cpu/core clock pll source and
99 * set up dependent divisors for PERI and ACLK clocks.
100 * core hz : apll = 1:1
102 aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
103 assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
105 pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
106 assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
108 rk_clrsetreg(&cru->cru_clksel_con[0],
109 CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
110 CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
111 0 << CORE_DIV_CON_SHIFT);
113 rk_clrsetreg(&cru->cru_clksel_con[1],
114 CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
115 aclk_div << CORE_ACLK_DIV_SHIFT |
116 pclk_div << CORE_PERI_DIV_SHIFT);
119 * select apll as pd_bus bus clock source and
120 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
122 aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
123 assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
125 pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
126 assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
128 hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
129 assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
131 rk_clrsetreg(&cru->cru_clksel_con[0],
132 BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
133 BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
134 aclk_div << BUS_ACLK_DIV_SHIFT);
136 rk_clrsetreg(&cru->cru_clksel_con[1],
137 BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
138 pclk_div << BUS_PCLK_DIV_SHIFT |
139 hclk_div << BUS_HCLK_DIV_SHIFT);
142 * select gpll as pd_peri bus clock source and
143 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
145 aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
146 assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
148 hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
149 assert((1 << hclk_div) * PERI_HCLK_HZ ==
150 PERI_ACLK_HZ && (hclk_div < 0x4));
152 pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
153 assert((1 << pclk_div) * PERI_PCLK_HZ ==
154 PERI_ACLK_HZ && pclk_div < 0x8);
156 rk_clrsetreg(&cru->cru_clksel_con[10],
157 PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
158 PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
159 PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
160 pclk_div << PERI_PCLK_DIV_SHIFT |
161 hclk_div << PERI_HCLK_DIV_SHIFT |
162 aclk_div << PERI_ACLK_DIV_SHIFT);
164 /* PLL enter normal-mode */
165 rk_clrsetreg(&cru->cru_mode_con,
166 GPLL_MODE_MASK | APLL_MODE_MASK,
167 GPLL_MODE_NORM << GPLL_MODE_SHIFT |
168 APLL_MODE_NORM << APLL_MODE_SHIFT);
171 /* Get pll rate by id */
172 static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
173 enum rk_clk_id clk_id)
175 uint32_t refdiv, fbdiv, postdiv1, postdiv2;
177 int pll_id = rk_pll_id(clk_id);
178 struct rk3036_pll *pll = &cru->pll[pll_id];
179 static u8 clk_shift[CLK_COUNT] = {
180 0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
181 GPLL_MODE_SHIFT, 0xff
183 static u32 clk_mask[CLK_COUNT] = {
184 0xffffffff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xffffffff,
185 GPLL_MODE_MASK, 0xffffffff
190 con = readl(&cru->cru_mode_con);
191 shift = clk_shift[clk_id];
192 mask = clk_mask[clk_id];
194 switch ((con & mask) >> shift) {
200 con = readl(&pll->con0);
201 postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
202 fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
203 con = readl(&pll->con1);
204 postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
205 refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
206 return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
213 static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
223 con = readl(&cru->cru_clksel_con[12]);
224 mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
225 div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
229 con = readl(&cru->cru_clksel_con[12]);
230 mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
231 div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
237 src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
238 return DIV_TO_RATE(src_rate, div) / 2;
241 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
242 int periph, uint freq)
247 debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
249 /* mmc clock auto divide 2 in internal */
250 src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
252 if (src_clk_div > 128) {
253 src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
254 assert(src_clk_div - 1 < 128);
263 rk_clrsetreg(&cru->cru_clksel_con[12],
264 EMMC_PLL_MASK | EMMC_DIV_MASK,
265 mux << EMMC_PLL_SHIFT |
266 (src_clk_div - 1) << EMMC_DIV_SHIFT);
270 rk_clrsetreg(&cru->cru_clksel_con[11],
271 MMC0_PLL_MASK | MMC0_DIV_MASK,
272 mux << MMC0_PLL_SHIFT |
273 (src_clk_div - 1) << MMC0_DIV_SHIFT);
279 return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
282 static ulong rk3036_clk_get_rate(struct clk *clk)
284 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
288 return rkclk_pll_get_rate(priv->cru, clk->id);
294 static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
296 struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
297 ulong new_rate, gclk_rate;
299 gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
305 new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
315 static struct clk_ops rk3036_clk_ops = {
316 .get_rate = rk3036_clk_get_rate,
317 .set_rate = rk3036_clk_set_rate,
320 static int rk3036_clk_probe(struct udevice *dev)
322 struct rk3036_clk_priv *priv = dev_get_priv(dev);
324 priv->cru = (struct rk3036_cru *)devfdt_get_addr(dev);
325 rkclk_init(priv->cru);
330 static int rk3036_clk_bind(struct udevice *dev)
333 struct udevice *sys_child;
334 struct sysreset_reg *priv;
336 /* The reset driver does not have a device node, so bind it here */
337 ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
340 debug("Warning: No sysreset driver: ret=%d\n", ret);
342 priv = malloc(sizeof(struct sysreset_reg));
343 priv->glb_srst_fst_value = offsetof(struct rk3036_cru,
344 cru_glb_srst_fst_value);
345 priv->glb_srst_snd_value = offsetof(struct rk3036_cru,
346 cru_glb_srst_snd_value);
347 sys_child->priv = priv;
350 #if CONFIG_IS_ENABLED(CONFIG_RESET_ROCKCHIP)
351 ret = offsetof(struct rk3036_cru, cru_softrst_con[0]);
352 ret = rockchip_reset_bind(dev, ret, 9);
354 debug("Warning: software reset driver bind faile\n");
360 static const struct udevice_id rk3036_clk_ids[] = {
361 { .compatible = "rockchip,rk3036-cru" },
365 U_BOOT_DRIVER(rockchip_rk3036_cru) = {
366 .name = "clk_rk3036",
368 .of_match = rk3036_clk_ids,
369 .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
370 .ops = &rk3036_clk_ops,
371 .bind = rk3036_clk_bind,
372 .probe = rk3036_clk_probe,