1 /*
2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
3 * reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the NetLogic
9 * license below:
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in
19 * the documentation and/or other materials provided with the
20 * distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <linux/types.h>
36 #include <linux/kernel.h>
37 #include <linux/mm.h>
38 #include <linux/delay.h>
39
40 #include <asm/mipsregs.h>
41 #include <asm/time.h>
42
43 #include <asm/netlogic/haldefs.h>
44 #include <asm/netlogic/xlp-hal/iomap.h>
45 #include <asm/netlogic/xlp-hal/xlp.h>
46 #include <asm/netlogic/xlp-hal/pic.h>
47 #include <asm/netlogic/xlp-hal/sys.h>
48
49 /* These addresses are computed by the nlm_hal_init() */
50 uint64_t nlm_io_base;
51 uint64_t nlm_sys_base;
52 uint64_t nlm_pic_base;
53
54 /* Main initialization */
nlm_hal_init(void)55 void nlm_hal_init(void)
56 {
57 nlm_io_base = CKSEG1ADDR(XLP_DEFAULT_IO_BASE);
58 nlm_sys_base = nlm_get_sys_regbase(0); /* node 0 */
59 nlm_pic_base = nlm_get_pic_regbase(0); /* node 0 */
60 }
61
nlm_irq_to_irt(int irq)62 int nlm_irq_to_irt(int irq)
63 {
64 if (!PIC_IRQ_IS_IRT(irq))
65 return -1;
66
67 switch (irq) {
68 case PIC_UART_0_IRQ:
69 return PIC_IRT_UART_0_INDEX;
70 case PIC_UART_1_IRQ:
71 return PIC_IRT_UART_1_INDEX;
72 default:
73 return -1;
74 }
75 }
76
nlm_irt_to_irq(int irt)77 int nlm_irt_to_irq(int irt)
78 {
79 switch (irt) {
80 case PIC_IRT_UART_0_INDEX:
81 return PIC_UART_0_IRQ;
82 case PIC_IRT_UART_1_INDEX:
83 return PIC_UART_1_IRQ;
84 default:
85 return -1;
86 }
87 }
88
nlm_get_core_frequency(int core)89 unsigned int nlm_get_core_frequency(int core)
90 {
91 unsigned int pll_divf, pll_divr, dfs_div, ext_div;
92 unsigned int rstval, dfsval, denom;
93 uint64_t num;
94
95 rstval = nlm_read_sys_reg(nlm_sys_base, SYS_POWER_ON_RESET_CFG);
96 dfsval = nlm_read_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIV_VALUE);
97 pll_divf = ((rstval >> 10) & 0x7f) + 1;
98 pll_divr = ((rstval >> 8) & 0x3) + 1;
99 ext_div = ((rstval >> 30) & 0x3) + 1;
100 dfs_div = ((dfsval >> (core * 4)) & 0xf) + 1;
101
102 num = 800000000ULL * pll_divf;
103 denom = 3 * pll_divr * ext_div * dfs_div;
104 do_div(num, denom);
105 return (unsigned int)num;
106 }
107
nlm_get_cpu_frequency(void)108 unsigned int nlm_get_cpu_frequency(void)
109 {
110 return nlm_get_core_frequency(0);
111 }
112