1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in
15 *    the documentation and/or other materials provided with the
16 *    distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * NETLOGIC_BSD */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34#include <sys/param.h>
35#include <sys/types.h>
36#include <sys/systm.h>
37
38#include <mips/nlm/hal/mips-extns.h>
39#include <mips/nlm/hal/haldefs.h>
40#include <mips/nlm/hal/iomap.h>
41#include <mips/nlm/hal/sys.h>
42#include <mips/nlm/xlp.h>
43
44uint32_t
45xlp_get_cpu_frequency(int node, int core)
46{
47	uint64_t sysbase = nlm_get_sys_regbase(node);
48	unsigned int pll_divf, pll_divr, dfs_div, ext_div;
49	unsigned int rstval, dfsval;
50
51	rstval = nlm_read_sys_reg(sysbase, SYS_POWER_ON_RESET_CFG);
52	dfsval = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIV_VALUE);
53	pll_divf = ((rstval >> 10) & 0x7f) + 1;
54	pll_divr = ((rstval >> 8)  & 0x3) + 1;
55	if (!nlm_is_xlp8xx_ax())
56		ext_div = ((rstval >> 30) & 0x3) + 1;
57	else
58		ext_div = 1;
59	dfs_div  = ((dfsval >> (core << 2)) & 0xf) + 1;
60
61	return ((800000000ULL * pll_divf)/(3 * pll_divr * ext_div * dfs_div));
62}
63
64static u_int
65nlm_get_device_frequency(uint64_t sysbase, int devtype)
66{
67	uint32_t pllctrl, dfsdiv, spf, spr, div_val;
68	int extra_div;
69
70	pllctrl = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL);
71	if (devtype <= 7)
72		div_val = nlm_read_sys_reg(sysbase, SYS_DFS_DIV_VALUE0);
73	else {
74		devtype -= 8;
75		div_val = nlm_read_sys_reg(sysbase, SYS_DFS_DIV_VALUE1);
76	}
77	dfsdiv = ((div_val >> (devtype << 2)) & 0xf) + 1;
78	spf = (pllctrl >> 3 & 0x7f) + 1;
79	spr = (pllctrl >> 1 & 0x03) + 1;
80	if (devtype == DFS_DEVICE_NAE && !nlm_is_xlp8xx_ax())
81		extra_div = 2;
82	else
83		extra_div = 1;
84
85	return ((400 * spf) / (3 * extra_div * spr * dfsdiv));
86}
87
88int
89nlm_set_device_frequency(int node, int devtype, int frequency)
90{
91	uint64_t sysbase;
92	u_int cur_freq;
93	int dec_div;
94
95	sysbase = nlm_get_sys_regbase(node);
96	cur_freq = nlm_get_device_frequency(sysbase, devtype);
97	if (cur_freq < (frequency - 5))
98		dec_div = 1;
99	else
100		dec_div = 0;
101
102	for(;;) {
103		if ((cur_freq >= (frequency - 5)) && (cur_freq <= frequency))
104			break;
105		if (dec_div)
106			nlm_write_sys_reg(sysbase, SYS_DFS_DIV_DEC_CTRL,
107			    (1 << devtype));
108		else
109			nlm_write_sys_reg(sysbase, SYS_DFS_DIV_INC_CTRL,
110			    (1 << devtype));
111		cur_freq = nlm_get_device_frequency(sysbase, devtype);
112	}
113	return (nlm_get_device_frequency(sysbase, devtype));
114}
115