arch/arm/mach-shmobile/clock-r8a7778.c

   1 /*
   2  * r8a7778 clock framework support
   3  *
   4  * Copyright (C) 2013  Renesas Solutions Corp.
   5  * Copyright (C) 2013  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * based on r8a7779
   8  *
   9  * Copyright (C) 2011  Renesas Solutions Corp.
  10  * Copyright (C) 2011  Magnus Damm
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <linux/io.h>
  27 #include <linux/sh_clk.h>
  28 #include <linux/clkdev.h>
  29 #include <mach/common.h>
  30
  31 #define MSTPCR0         IOMEM(0xffc80030)
  32 #define MSTPCR1         IOMEM(0xffc80034)
  33 #define MSTPCR3         IOMEM(0xffc8003c)
  34 #define MSTPSR1         IOMEM(0xffc80044)
  35 #define MSTPSR4         IOMEM(0xffc80048)
  36 #define MSTPSR6         IOMEM(0xffc8004c)
  37 #define MSTPCR4         IOMEM(0xffc80050)
  38 #define MSTPCR5         IOMEM(0xffc80054)
  39 #define MSTPCR6         IOMEM(0xffc80058)
  40
  41 /* ioremap() through clock mapping mandatory to avoid
  42  * collision with ARM coherent DMA virtual memory range.
  43  */
  44
  45 static struct clk_mapping cpg_mapping = {
  46         .phys   = 0xffc80000,
  47         .len    = 0x80,
  48 };
  49
  50 static struct clk clkp = {
  51         .rate   = 62500000, /* FIXME: shortcut */
  52         .flags  = CLK_ENABLE_ON_INIT,
  53         .mapping = &cpg_mapping,
  54 };
  55
  56 static struct clk *main_clks[] = {
  57         &clkp,
  58 };
  59
  60 enum {
  61         MSTP114,
  62         MSTP026, MSTP025, MSTP024, MSTP023, MSTP022, MSTP021,
  63         MSTP016, MSTP015,
  64         MSTP_NR };
  65
  66 static struct clk mstp_clks[MSTP_NR] = {
  67         [MSTP114] = SH_CLK_MSTP32(&clkp, MSTPCR1, 14, 0), /* Ether */
  68         [MSTP026] = SH_CLK_MSTP32(&clkp, MSTPCR0, 26, 0), /* SCIF0 */
  69         [MSTP025] = SH_CLK_MSTP32(&clkp, MSTPCR0, 25, 0), /* SCIF1 */
  70         [MSTP024] = SH_CLK_MSTP32(&clkp, MSTPCR0, 24, 0), /* SCIF2 */
  71         [MSTP023] = SH_CLK_MSTP32(&clkp, MSTPCR0, 23, 0), /* SCIF3 */
  72         [MSTP022] = SH_CLK_MSTP32(&clkp, MSTPCR0, 22, 0), /* SCIF4 */
  73         [MSTP021] = SH_CLK_MSTP32(&clkp, MSTPCR0, 21, 0), /* SCIF5 */
  74         [MSTP016] = SH_CLK_MSTP32(&clkp, MSTPCR0, 16, 0), /* TMU0 */
  75         [MSTP015] = SH_CLK_MSTP32(&clkp, MSTPCR0, 15, 0), /* TMU1 */
  76 };
  77
  78 static struct clk_lookup lookups[] = {
  79         /* MSTP32 clocks */
  80         CLKDEV_DEV_ID("sh-eth", &mstp_clks[MSTP114]), /* Ether */
  81         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP026]), /* SCIF0 */
  82         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP025]), /* SCIF1 */
  83         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP024]), /* SCIF2 */
  84         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP023]), /* SCIF3 */
  85         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP022]), /* SCIF4 */
  86         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP021]), /* SCIF6 */
  87         CLKDEV_DEV_ID("sh_tmu.0", &mstp_clks[MSTP016]), /* TMU00 */
  88         CLKDEV_DEV_ID("sh_tmu.1", &mstp_clks[MSTP015]), /* TMU01 */
  89 };
  90
  91 void __init r8a7778_clock_init(void)
  92 {
  93         int k, ret = 0;
  94
  95         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
  96                 ret = clk_register(main_clks[k]);
  97
  98         if (!ret)
  99                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 100
 101         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 102
 103         if (!ret)
 104                 shmobile_clk_init();
 105         else
 106                 panic("failed to setup r8a7778 clocks\n");
 107 }