1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2018 - Beniamino Galvani <b.galvani@gmail.com>
4 * (C) Copyright 2018 - BayLibre, SAS
5 * Author: Neil Armstrong <narmstrong@baylibre.com>
9 #include <asm/arch/clock-axg.h>
11 #include <clk-uclass.h>
16 #include <dt-bindings/clock/axg-clkc.h>
17 #include "clk_meson.h"
18 #include <linux/err.h>
20 #define XTAL_RATE 24000000
26 static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id);
28 static struct meson_gate gates[] = {
29 /* Everything Else (EE) domain gates */
30 MESON_GATE(CLKID_SPICC0, HHI_GCLK_MPEG0, 8),
31 MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9),
32 MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13),
33 MESON_GATE(CLKID_SPICC1, HHI_GCLK_MPEG0, 15),
34 MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25),
35 MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26),
36 MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3),
37 MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16),
39 /* Always On (AO) domain gates */
40 MESON_GATE(CLKID_AO_I2C, HHI_GCLK_AO, 4),
43 /* CLKID_FCLK_DIV2 is critical for the SCPI Processor */
44 MESON_GATE(CLKID_MPLL2, HHI_MPLL_CNTL9, 14),
45 /* CLKID_CLK81 is critical for the system */
47 /* Peripheral Gates */
48 MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23),
49 MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7),
52 static int meson_set_gate(struct clk *clk, bool on)
54 struct meson_clk *priv = dev_get_priv(clk->dev);
55 struct meson_gate *gate;
57 if (clk->id >= ARRAY_SIZE(gates))
60 gate = &gates[clk->id];
65 regmap_update_bits(priv->map, gate->reg,
66 BIT(gate->bit), on ? BIT(gate->bit) : 0);
71 static int meson_clk_enable(struct clk *clk)
73 return meson_set_gate(clk, true);
76 static int meson_clk_disable(struct clk *clk)
78 return meson_set_gate(clk, false);
81 static unsigned long meson_clk81_get_rate(struct clk *clk)
83 struct meson_clk *priv = dev_get_priv(clk->dev);
84 unsigned long parent_rate;
98 regmap_read(priv->map, HHI_MPEG_CLK_CNTL, ®);
99 reg = (reg >> 12) & 7;
103 parent_rate = XTAL_RATE;
108 parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]);
112 regmap_read(priv->map, HHI_MPEG_CLK_CNTL, ®);
113 reg = reg & ((1 << 7) - 1);
115 return parent_rate / reg;
118 static long mpll_rate_from_params(unsigned long parent_rate,
122 unsigned long divisor = (SDM_DEN * n2) + sdm;
127 return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor);
130 static struct parm meson_mpll0_parm[3] = {
131 {HHI_MPLL_CNTL7, 0, 14}, /* psdm */
132 {HHI_MPLL_CNTL7, 16, 9}, /* pn2 */
135 static struct parm meson_mpll1_parm[3] = {
136 {HHI_MPLL_CNTL8, 0, 14}, /* psdm */
137 {HHI_MPLL_CNTL8, 16, 9}, /* pn2 */
140 static struct parm meson_mpll2_parm[3] = {
141 {HHI_MPLL_CNTL9, 0, 14}, /* psdm */
142 {HHI_MPLL_CNTL9, 16, 9}, /* pn2 */
146 * MultiPhase Locked Loops are outputs from a PLL with additional frequency
147 * scaling capabilities. MPLL rates are calculated as:
149 * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
151 static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id)
153 struct meson_clk *priv = dev_get_priv(clk->dev);
154 struct parm *psdm, *pn2;
155 unsigned long sdm, n2;
156 unsigned long parent_rate;
161 psdm = &meson_mpll0_parm[0];
162 pn2 = &meson_mpll0_parm[1];
165 psdm = &meson_mpll1_parm[0];
166 pn2 = &meson_mpll1_parm[1];
169 psdm = &meson_mpll2_parm[0];
170 pn2 = &meson_mpll2_parm[1];
176 parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL);
177 if (IS_ERR_VALUE(parent_rate))
180 regmap_read(priv->map, psdm->reg_off, ®);
181 sdm = PARM_GET(psdm->width, psdm->shift, reg);
183 regmap_read(priv->map, pn2->reg_off, ®);
184 n2 = PARM_GET(pn2->width, pn2->shift, reg);
186 return mpll_rate_from_params(parent_rate, sdm, n2);
189 static struct parm meson_fixed_pll_parm[3] = {
190 {HHI_MPLL_CNTL, 0, 9}, /* pm */
191 {HHI_MPLL_CNTL, 9, 5}, /* pn */
192 {HHI_MPLL_CNTL, 16, 2}, /* pod */
195 static struct parm meson_sys_pll_parm[3] = {
196 {HHI_SYS_PLL_CNTL, 0, 9}, /* pm */
197 {HHI_SYS_PLL_CNTL, 9, 5}, /* pn */
198 {HHI_SYS_PLL_CNTL, 16, 2}, /* pod */
201 static ulong meson_pll_get_rate(struct clk *clk, unsigned long id)
203 struct meson_clk *priv = dev_get_priv(clk->dev);
204 struct parm *pm, *pn, *pod;
205 unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
210 case CLKID_FIXED_PLL:
211 pm = &meson_fixed_pll_parm[0];
212 pn = &meson_fixed_pll_parm[1];
213 pod = &meson_fixed_pll_parm[2];
216 pm = &meson_sys_pll_parm[0];
217 pn = &meson_sys_pll_parm[1];
218 pod = &meson_sys_pll_parm[2];
224 regmap_read(priv->map, pn->reg_off, ®);
225 n = PARM_GET(pn->width, pn->shift, reg);
227 regmap_read(priv->map, pm->reg_off, ®);
228 m = PARM_GET(pm->width, pm->shift, reg);
230 regmap_read(priv->map, pod->reg_off, ®);
231 od = PARM_GET(pod->width, pod->shift, reg);
233 return ((parent_rate_mhz * m / n) >> od) * 1000000;
236 static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id)
241 case CLKID_FIXED_PLL:
243 rate = meson_pll_get_rate(clk, id);
245 case CLKID_FCLK_DIV2:
246 rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2;
248 case CLKID_FCLK_DIV3:
249 rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3;
251 case CLKID_FCLK_DIV4:
252 rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4;
254 case CLKID_FCLK_DIV5:
255 rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5;
257 case CLKID_FCLK_DIV7:
258 rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7;
263 rate = meson_mpll_get_rate(clk, id);
266 rate = meson_clk81_get_rate(clk);
269 if (gates[id].reg != 0) {
271 rate = meson_clk81_get_rate(clk);
277 debug("clock %lu has rate %lu\n", id, rate);
281 static ulong meson_clk_get_rate(struct clk *clk)
283 return meson_clk_get_rate_by_id(clk, clk->id);
286 static int meson_clk_probe(struct udevice *dev)
288 struct meson_clk *priv = dev_get_priv(dev);
290 priv->map = syscon_node_to_regmap(dev_get_parent(dev)->node);
291 if (IS_ERR(priv->map))
292 return PTR_ERR(priv->map);
295 * Depending on the boot src, the state of the MMC clock might
296 * be different. Reset it to make sure we won't get stuck
298 regmap_write(priv->map, HHI_NAND_CLK_CNTL, 0);
299 regmap_write(priv->map, HHI_SD_EMMC_CLK_CNTL, 0);
301 debug("meson-clk-axg: probed\n");
306 static struct clk_ops meson_clk_ops = {
307 .disable = meson_clk_disable,
308 .enable = meson_clk_enable,
309 .get_rate = meson_clk_get_rate,
312 static const struct udevice_id meson_clk_ids[] = {
313 { .compatible = "amlogic,axg-clkc" },
317 U_BOOT_DRIVER(meson_clk_axg) = {
318 .name = "meson_clk_axg",
320 .of_match = meson_clk_ids,
321 .priv_auto_alloc_size = sizeof(struct meson_clk),
322 .ops = &meson_clk_ops,
323 .probe = meson_clk_probe,