1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PowerQUICC II support functions
4 *
5 * Author: Scott Wood <scottwood@freescale.com>
6 *
7 * Copyright (c) 2007 Freescale Semiconductor, Inc.
8 */
9
10#include "ops.h"
11#include "types.h"
12#include "fsl-soc.h"
13#include "pq2.h"
14#include "stdio.h"
15#include "io.h"
16
17#define PQ2_SCCR (0x10c80/4) /* System Clock Configuration Register */
18#define PQ2_SCMR (0x10c88/4) /* System Clock Mode Register */
19
20static int pq2_corecnf_map[] = {
21	3, 2, 2, 2, 4, 4, 5, 9, 6, 11, 8, 10, 3, 12, 7, -1,
22	6, 5, 13, 2, 14, 4, 15, 9, 0, 11, 8, 10, 16, 12, 7, -1
23};
24
25/* Get various clocks from crystal frequency.
26 * Returns zero on failure and non-zero on success.
27 */
28int pq2_get_clocks(u32 crystal, u32 *sysfreq, u32 *corefreq,
29                   u32 *timebase, u32 *brgfreq)
30{
31	u32 *immr;
32	u32 sccr, scmr, mainclk, busclk;
33	int corecnf, busdf, plldf, pllmf, dfbrg;
34
35	immr = fsl_get_immr();
36	if (!immr) {
37		printf("pq2_get_clocks: Couldn't get IMMR base.\r\n");
38		return 0;
39	}
40
41	sccr = in_be32(&immr[PQ2_SCCR]);
42	scmr = in_be32(&immr[PQ2_SCMR]);
43
44	dfbrg = sccr & 3;
45	corecnf = (scmr >> 24) & 0x1f;
46	busdf = (scmr >> 20) & 0xf;
47	plldf = (scmr >> 12) & 1;
48	pllmf = scmr & 0xfff;
49
50	mainclk = crystal * (pllmf + 1) / (plldf + 1);
51	busclk = mainclk / (busdf + 1);
52
53	if (sysfreq)
54		*sysfreq = mainclk / 2;
55	if (timebase)
56		*timebase = busclk / 4;
57	if (brgfreq)
58		*brgfreq = mainclk / (1 << ((dfbrg + 1) * 2));
59
60	if (corefreq) {
61		int coremult = pq2_corecnf_map[corecnf];
62
63		if (coremult < 0)
64			*corefreq = mainclk / 2;
65		else if (coremult == 0)
66			return 0;
67		else
68			*corefreq = busclk * coremult / 2;
69	}
70
71	return 1;
72}
73
74/* Set common device tree fields based on the given clock frequencies. */
75void pq2_set_clocks(u32 sysfreq, u32 corefreq, u32 timebase, u32 brgfreq)
76{
77	void *node;
78
79	dt_fixup_cpu_clocks(corefreq, timebase, sysfreq);
80
81	node = finddevice("/soc/cpm");
82	if (node)
83		setprop(node, "clock-frequency", &sysfreq, 4);
84
85	node = finddevice("/soc/cpm/brg");
86	if (node)
87		setprop(node, "clock-frequency", &brgfreq, 4);
88}
89
90int pq2_fixup_clocks(u32 crystal)
91{
92	u32 sysfreq, corefreq, timebase, brgfreq;
93
94	if (!pq2_get_clocks(crystal, &sysfreq, &corefreq, &timebase, &brgfreq))
95		return 0;
96
97	pq2_set_clocks(sysfreq, corefreq, timebase, brgfreq);
98	return 1;
99}
100