1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <sys/param.h>
34 #include <sys/types.h>
35 #include <sys/systm.h>
36
37 #include <mips/nlm/hal/mips-extns.h>
38 #include <mips/nlm/hal/haldefs.h>
39 #include <mips/nlm/hal/iomap.h>
40 #include <mips/nlm/hal/sys.h>
41 #include <mips/nlm/xlp.h>
42
43 uint32_t
xlp_get_cpu_frequency(int node,int core)44 xlp_get_cpu_frequency(int node, int core)
45 {
46 uint64_t sysbase = nlm_get_sys_regbase(node);
47 unsigned int pll_divf, pll_divr, dfs_div, ext_div;
48 unsigned int rstval, dfsval;
49
50 rstval = nlm_read_sys_reg(sysbase, SYS_POWER_ON_RESET_CFG);
51 dfsval = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIV_VALUE);
52 pll_divf = ((rstval >> 10) & 0x7f) + 1;
53 pll_divr = ((rstval >> 8) & 0x3) + 1;
54 if (!nlm_is_xlp8xx_ax())
55 ext_div = ((rstval >> 30) & 0x3) + 1;
56 else
57 ext_div = 1;
58 dfs_div = ((dfsval >> (core << 2)) & 0xf) + 1;
59
60 return ((800000000ULL * pll_divf)/(3 * pll_divr * ext_div * dfs_div));
61 }
62
63 static u_int
nlm_get_device_frequency(uint64_t sysbase,int devtype)64 nlm_get_device_frequency(uint64_t sysbase, int devtype)
65 {
66 uint32_t pllctrl, dfsdiv, spf, spr, div_val;
67 int extra_div;
68
69 pllctrl = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL);
70 if (devtype <= 7)
71 div_val = nlm_read_sys_reg(sysbase, SYS_DFS_DIV_VALUE0);
72 else {
73 devtype -= 8;
74 div_val = nlm_read_sys_reg(sysbase, SYS_DFS_DIV_VALUE1);
75 }
76 dfsdiv = ((div_val >> (devtype << 2)) & 0xf) + 1;
77 spf = (pllctrl >> 3 & 0x7f) + 1;
78 spr = (pllctrl >> 1 & 0x03) + 1;
79 if (devtype == DFS_DEVICE_NAE && !nlm_is_xlp8xx_ax())
80 extra_div = 2;
81 else
82 extra_div = 1;
83
84 return ((400 * spf) / (3 * extra_div * spr * dfsdiv));
85 }
86
87 int
nlm_set_device_frequency(int node,int devtype,int frequency)88 nlm_set_device_frequency(int node, int devtype, int frequency)
89 {
90 uint64_t sysbase;
91 u_int cur_freq;
92 int dec_div;
93
94 sysbase = nlm_get_sys_regbase(node);
95 cur_freq = nlm_get_device_frequency(sysbase, devtype);
96 if (cur_freq < (frequency - 5))
97 dec_div = 1;
98 else
99 dec_div = 0;
100
101 for(;;) {
102 if ((cur_freq >= (frequency - 5)) && (cur_freq <= frequency))
103 break;
104 if (dec_div)
105 nlm_write_sys_reg(sysbase, SYS_DFS_DIV_DEC_CTRL,
106 (1 << devtype));
107 else
108 nlm_write_sys_reg(sysbase, SYS_DFS_DIV_INC_CTRL,
109 (1 << devtype));
110 cur_freq = nlm_get_device_frequency(sysbase, devtype);
111 }
112 return (nlm_get_device_frequency(sysbase, devtype));
113 }
114