arch/mips/netlogic/xlp/nlm_hal.c

   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 */
  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
  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
  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
  89 unsigned int nlm_get_cpu_frequency(void)
  90 {
  91         unsigned int pll_divf, pll_divr, dfs_div, denom;
  92         unsigned int val;
  93         uint64_t num;
  94
  95         val = nlm_read_sys_reg(nlm_sys_base, SYS_POWER_ON_RESET_CFG);
  96         pll_divf = (val >> 10) & 0x7f;
  97         pll_divr = (val >> 8)  & 0x3;
  98         dfs_div  = (val >> 17) & 0x3;
  99
 100         num = pll_divf + 1;
 101         denom = 3 * (pll_divr + 1) * (1 << (dfs_div + 1));
 102         num = num * 800000000ULL;
 103         do_div(num, denom);
 104         return (unsigned int)num;
 105 }