arch/arm/mach-shmobile/clock-r8a7790.c

   1 /*
   2  * r8a7790 clock framework support
   3  *
   4  * Copyright (C) 2013  Renesas Solutions Corp.
   5  * Copyright (C) 2013  Magnus Damm
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sh_clk.h>
  24 #include <linux/clkdev.h>
  25 #include <mach/common.h>
  26
  27 #define CPG_BASE 0xe6150000
  28 #define CPG_LEN 0x1000
  29
  30 #define SMSTPCR2 0xe6150138
  31 #define SMSTPCR7 0xe615014c
  32
  33 static struct clk_mapping cpg_mapping = {
  34         .phys   = CPG_BASE,
  35         .len    = CPG_LEN,
  36 };
  37
  38 static struct clk p_clk = {
  39         .rate   = 65000000, /* shortcut for now */
  40         .mapping        = &cpg_mapping,
  41 };
  42
  43 static struct clk mp_clk = {
  44         .rate   = 52000000,  /* shortcut for now */
  45         .mapping        = &cpg_mapping,
  46 };
  47
  48 static struct clk *main_clks[] = {
  49         &p_clk,
  50         &mp_clk,
  51 };
  52
  53 enum { MSTP721, MSTP720,
  54         MSTP216, MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP_NR };
  55 static struct clk mstp_clks[MSTP_NR] = {
  56         [MSTP721] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 21, 0), /* SCIF0 */
  57         [MSTP720] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 20, 0), /* SCIF1 */
  58         [MSTP216] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 16, 0), /* SCIFB2 */
  59         [MSTP207] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 7, 0), /* SCIFB1 */
  60         [MSTP206] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 6, 0), /* SCIFB0 */
  61         [MSTP204] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 4, 0), /* SCIFA0 */
  62         [MSTP203] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 3, 0), /* SCIFA1 */
  63         [MSTP202] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 2, 0), /* SCIFA2 */
  64 };
  65
  66 static struct clk_lookup lookups[] = {
  67         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP204]),
  68         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP203]),
  69         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP206]),
  70         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP207]),
  71         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP216]),
  72         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP202]),
  73         CLKDEV_DEV_ID("sh-sci.6", &mstp_clks[MSTP721]),
  74         CLKDEV_DEV_ID("sh-sci.7", &mstp_clks[MSTP720]),
  75 };
  76
  77 void __init r8a7790_clock_init(void)
  78 {
  79         int k, ret = 0;
  80
  81         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
  82                 ret = clk_register(main_clks[k]);
  83
  84         if (!ret)
  85                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
  86
  87         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
  88
  89         if (!ret)
  90                 shmobile_clk_init();
  91         else
  92                 panic("failed to setup r8a7790 clocks\n");
  93 }