2 * Renesas RCar Gen3 CPG MSSR driver
4 * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
6 * Based on the following driver from Linux kernel:
7 * r8a7796 Clock Pulse Generator / Module Standby and Software Reset
9 * Copyright (C) 2016 Glider bvba
11 * SPDX-License-Identifier: GPL-2.0+
15 #include <clk-uclass.h>
21 #include <dt-bindings/clock/renesas-cpg-mssr.h>
23 #include "renesas-cpg-mssr.h"
25 #define CPG_RST_MODEMR 0x0060
27 #define CPG_PLL0CR 0x00d8
28 #define CPG_PLL2CR 0x002c
29 #define CPG_PLL4CR 0x01f4
31 #define CPG_RPC_PREDIV_MASK 0x3
32 #define CPG_RPC_PREDIV_OFFSET 3
33 #define CPG_RPC_POSTDIV_MASK 0x7
34 #define CPG_RPC_POSTDIV_OFFSET 0
37 * Module Standby and Software Reset register offets.
39 * If the registers exist, these are valid for SH-Mobile, R-Mobile,
40 * R-Car Gen2, R-Car Gen3, and RZ/G1.
41 * These are NOT valid for R-Car Gen1 and RZ/A1!
45 * Module Stop Status Register offsets
48 static const u16 mstpsr[] = {
49 0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
50 0x9A0, 0x9A4, 0x9A8, 0x9AC,
53 #define MSTPSR(i) mstpsr[i]
57 * System Module Stop Control Register offsets
60 static const u16 smstpcr[] = {
61 0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
62 0x990, 0x994, 0x998, 0x99C,
65 #define SMSTPCR(i) smstpcr[i]
68 /* Realtime Module Stop Control Register offsets */
69 #define RMSTPCR(i) (smstpcr[i] - 0x20)
71 /* Modem Module Stop Control Register offsets (r8a73a4) */
72 #define MMSTPCR(i) (smstpcr[i] + 0x20)
74 /* Software Reset Clearing Register offsets */
75 #define SRSTCLR(i) (0x940 + (i) * 4)
80 #define CPG_SD_STP_HCK BIT(9)
81 #define CPG_SD_STP_CK BIT(8)
83 #define CPG_SD_STP_MASK (CPG_SD_STP_HCK | CPG_SD_STP_CK)
84 #define CPG_SD_FC_MASK (0x7 << 2 | 0x3 << 0)
86 #define CPG_SD_DIV_TABLE_DATA(stp_hck, stp_ck, sd_srcfc, sd_fc, sd_div) \
88 .val = ((stp_hck) ? CPG_SD_STP_HCK : 0) | \
89 ((stp_ck) ? CPG_SD_STP_CK : 0) | \
102 * stp_hck stp_ck (div) (div) = sd_srcfc x sd_fc
103 *-------------------------------------------------------------------
108 * 1 0 4 (16) 1 (4) 64
113 * 1 0 4 (16) 0 (2) 32
115 static const struct sd_div_table cpg_sd_div_table[] = {
116 /* CPG_SD_DIV_TABLE_DATA(stp_hck, stp_ck, sd_srcfc, sd_fc, sd_div) */
117 CPG_SD_DIV_TABLE_DATA(0, 0, 0, 1, 4),
118 CPG_SD_DIV_TABLE_DATA(0, 0, 1, 1, 8),
119 CPG_SD_DIV_TABLE_DATA(1, 0, 2, 1, 16),
120 CPG_SD_DIV_TABLE_DATA(1, 0, 3, 1, 32),
121 CPG_SD_DIV_TABLE_DATA(1, 0, 4, 1, 64),
122 CPG_SD_DIV_TABLE_DATA(0, 0, 0, 0, 2),
123 CPG_SD_DIV_TABLE_DATA(0, 0, 1, 0, 4),
124 CPG_SD_DIV_TABLE_DATA(1, 0, 2, 0, 8),
125 CPG_SD_DIV_TABLE_DATA(1, 0, 3, 0, 16),
126 CPG_SD_DIV_TABLE_DATA(1, 0, 4, 0, 32),
129 static bool gen3_clk_is_mod(struct clk *clk)
131 return (clk->id >> 16) == CPG_MOD;
134 static int gen3_clk_get_mod(struct clk *clk, const struct mssr_mod_clk **mssr)
136 struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
137 struct cpg_mssr_info *info = priv->info;
138 const unsigned long clkid = clk->id & 0xffff;
141 if (!gen3_clk_is_mod(clk))
144 for (i = 0; i < info->mod_clk_size; i++) {
145 if (info->mod_clk[i].id !=
146 (info->mod_clk_base + MOD_CLK_PACK(clkid)))
149 *mssr = &info->mod_clk[i];
156 static int gen3_clk_get_core(struct clk *clk, const struct cpg_core_clk **core)
158 struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
159 struct cpg_mssr_info *info = priv->info;
160 const unsigned long clkid = clk->id & 0xffff;
163 if (gen3_clk_is_mod(clk))
166 for (i = 0; i < info->core_clk_size; i++) {
167 if (info->core_clk[i].id != clkid)
170 *core = &info->core_clk[i];
177 static int gen3_clk_get_parent(struct clk *clk, struct clk *parent)
179 const struct cpg_core_clk *core;
180 const struct mssr_mod_clk *mssr;
183 if (gen3_clk_is_mod(clk)) {
184 ret = gen3_clk_get_mod(clk, &mssr);
188 parent->id = mssr->parent;
190 ret = gen3_clk_get_core(clk, &core);
194 if (core->type == CLK_TYPE_IN)
195 parent->id = ~0; /* Top-level clock */
197 parent->id = core->parent;
200 parent->dev = clk->dev;
205 static int gen3_clk_setup_sdif_div(struct clk *clk)
207 struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
208 const struct cpg_core_clk *core;
212 ret = gen3_clk_get_parent(clk, &parent);
214 printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
218 if (gen3_clk_is_mod(&parent))
221 ret = gen3_clk_get_core(&parent, &core);
225 if (core->type != CLK_TYPE_GEN3_SD)
228 debug("%s[%i] SDIF offset=%x\n", __func__, __LINE__, core->offset);
230 writel(1, priv->base + core->offset);
235 static int gen3_clk_endisable(struct clk *clk, bool enable)
237 struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
238 const unsigned long clkid = clk->id & 0xffff;
239 const unsigned int reg = clkid / 100;
240 const unsigned int bit = clkid % 100;
241 const u32 bitmask = BIT(bit);
244 if (!gen3_clk_is_mod(clk))
247 debug("%s[%i] MSTP %lu=%02u/%02u %s\n", __func__, __LINE__,
248 clkid, reg, bit, enable ? "ON" : "OFF");
251 ret = gen3_clk_setup_sdif_div(clk);
254 clrbits_le32(priv->base + SMSTPCR(reg), bitmask);
255 return wait_for_bit("MSTP", priv->base + MSTPSR(reg),
258 setbits_le32(priv->base + SMSTPCR(reg), bitmask);
263 static int gen3_clk_enable(struct clk *clk)
265 return gen3_clk_endisable(clk, true);
268 static int gen3_clk_disable(struct clk *clk)
270 return gen3_clk_endisable(clk, false);
273 static ulong gen3_clk_get_rate(struct clk *clk)
275 struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
276 struct cpg_mssr_info *info = priv->info;
278 const struct cpg_core_clk *core;
279 const struct rcar_gen3_cpg_pll_config *pll_config =
280 priv->cpg_pll_config;
281 u32 value, mult, prediv, postdiv, rate = 0;
284 debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
286 ret = gen3_clk_get_parent(clk, &parent);
288 printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
292 if (gen3_clk_is_mod(clk)) {
293 rate = gen3_clk_get_rate(&parent);
294 debug("%s[%i] MOD clk: parent=%lu => rate=%u\n",
295 __func__, __LINE__, parent.id, rate);
299 ret = gen3_clk_get_core(clk, &core);
303 switch (core->type) {
305 if (core->id == info->clk_extal_id) {
306 rate = clk_get_rate(&priv->clk_extal);
307 debug("%s[%i] EXTAL clk: rate=%u\n",
308 __func__, __LINE__, rate);
312 if (core->id == info->clk_extalr_id) {
313 rate = clk_get_rate(&priv->clk_extalr);
314 debug("%s[%i] EXTALR clk: rate=%u\n",
315 __func__, __LINE__, rate);
321 case CLK_TYPE_GEN3_MAIN:
322 rate = gen3_clk_get_rate(&parent) / pll_config->extal_div;
323 debug("%s[%i] MAIN clk: parent=%i extal_div=%i => rate=%u\n",
325 core->parent, pll_config->extal_div, rate);
328 case CLK_TYPE_GEN3_PLL0:
329 value = readl(priv->base + CPG_PLL0CR);
330 mult = (((value >> 24) & 0x7f) + 1) * 2;
331 rate = gen3_clk_get_rate(&parent) * mult;
332 debug("%s[%i] PLL0 clk: parent=%i mult=%u => rate=%u\n",
333 __func__, __LINE__, core->parent, mult, rate);
336 case CLK_TYPE_GEN3_PLL1:
337 rate = gen3_clk_get_rate(&parent) * pll_config->pll1_mult;
338 debug("%s[%i] PLL1 clk: parent=%i mul=%i => rate=%u\n",
340 core->parent, pll_config->pll1_mult, rate);
343 case CLK_TYPE_GEN3_PLL2:
344 value = readl(priv->base + CPG_PLL2CR);
345 mult = (((value >> 24) & 0x7f) + 1) * 2;
346 rate = gen3_clk_get_rate(&parent) * mult;
347 debug("%s[%i] PLL2 clk: parent=%i mult=%u => rate=%u\n",
348 __func__, __LINE__, core->parent, mult, rate);
351 case CLK_TYPE_GEN3_PLL3:
352 rate = gen3_clk_get_rate(&parent) * pll_config->pll3_mult;
353 debug("%s[%i] PLL3 clk: parent=%i mul=%i => rate=%u\n",
355 core->parent, pll_config->pll3_mult, rate);
358 case CLK_TYPE_GEN3_PLL4:
359 value = readl(priv->base + CPG_PLL4CR);
360 mult = (((value >> 24) & 0x7f) + 1) * 2;
361 rate = gen3_clk_get_rate(&parent) * mult;
362 debug("%s[%i] PLL4 clk: parent=%i mult=%u => rate=%u\n",
363 __func__, __LINE__, core->parent, mult, rate);
367 case CLK_TYPE_GEN3_PE: /* FIXME */
368 rate = (gen3_clk_get_rate(&parent) * core->mult) / core->div;
369 debug("%s[%i] FIXED clk: parent=%i div=%i mul=%i => rate=%u\n",
371 core->parent, core->mult, core->div, rate);
374 case CLK_TYPE_GEN3_SD: /* FIXME */
375 value = readl(priv->base + core->offset);
376 value &= CPG_SD_STP_MASK | CPG_SD_FC_MASK;
378 for (i = 0; i < ARRAY_SIZE(cpg_sd_div_table); i++) {
379 if (cpg_sd_div_table[i].val != value)
382 rate = gen3_clk_get_rate(&parent) /
383 cpg_sd_div_table[i].div;
384 debug("%s[%i] SD clk: parent=%i div=%i => rate=%u\n",
386 core->parent, cpg_sd_div_table[i].div, rate);
393 case CLK_TYPE_GEN3_RPC:
394 rate = gen3_clk_get_rate(&parent);
396 value = readl(priv->base + core->offset);
398 prediv = (value >> CPG_RPC_PREDIV_OFFSET) &
402 else if (prediv == 3)
407 postdiv = (value >> CPG_RPC_POSTDIV_OFFSET) &
408 CPG_RPC_POSTDIV_MASK;
411 debug("%s[%i] RPC clk: parent=%i prediv=%i postdiv=%i => rate=%u\n",
413 core->parent, prediv, postdiv, rate);
419 printf("%s[%i] unknown fail\n", __func__, __LINE__);
424 static ulong gen3_clk_set_rate(struct clk *clk, ulong rate)
426 return gen3_clk_get_rate(clk);
429 static int gen3_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
431 if (args->args_count != 2) {
432 debug("Invaild args_count: %d\n", args->args_count);
436 clk->id = (args->args[0] << 16) | args->args[1];
441 const struct clk_ops gen3_clk_ops = {
442 .enable = gen3_clk_enable,
443 .disable = gen3_clk_disable,
444 .get_rate = gen3_clk_get_rate,
445 .set_rate = gen3_clk_set_rate,
446 .of_xlate = gen3_clk_of_xlate,
449 int gen3_clk_probe(struct udevice *dev)
451 struct gen3_clk_priv *priv = dev_get_priv(dev);
452 struct cpg_mssr_info *info =
453 (struct cpg_mssr_info *)dev_get_driver_data(dev);
458 priv->base = (struct gen3_base *)devfdt_get_addr(dev);
463 ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, info->reset_node);
467 rst_base = fdtdec_get_addr(gd->fdt_blob, ret, "reg");
468 if (rst_base == FDT_ADDR_T_NONE)
471 cpg_mode = readl(rst_base + CPG_RST_MODEMR);
473 priv->cpg_pll_config =
474 (struct rcar_gen3_cpg_pll_config *)info->get_pll_config(cpg_mode);
475 if (!priv->cpg_pll_config->extal_div)
478 ret = clk_get_by_name(dev, "extal", &priv->clk_extal);
482 if (info->extalr_node) {
483 ret = clk_get_by_name(dev, info->extalr_node, &priv->clk_extalr);
491 int gen3_clk_remove(struct udevice *dev)
493 struct gen3_clk_priv *priv = dev_get_priv(dev);
494 struct cpg_mssr_info *info = priv->info;
498 clrbits_le32(TMU_BASE + TSTR0, TSTR0_STR0);
500 /* Stop module clock */
501 for (i = 0; i < info->mstp_table_size; i++) {
502 clrsetbits_le32(priv->base + SMSTPCR(i),
503 info->mstp_table[i].sdis,
504 info->mstp_table[i].sen);
505 clrsetbits_le32(priv->base + RMSTPCR(i),
506 info->mstp_table[i].rdis,
507 info->mstp_table[i].ren);