arch/arm/mach-shmobile/clock-r8a73a4.c

   1 /*
   2  * r8a73a4 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 0x270
  29
  30 #define MPCKCR 0xe6150080
  31 #define SMSTPCR2 0xe6150138
  32 #define SMSTPCR5 0xe6150144
  33
  34 static struct clk_mapping cpg_mapping = {
  35         .phys   = CPG_BASE,
  36         .len    = CPG_LEN,
  37 };
  38
  39 static struct clk extalr_clk = {
  40         .rate   = 32768,
  41         .mapping        = &cpg_mapping,
  42 };
  43
  44 static struct clk extal1_clk = {
  45         .rate   = 26000000,
  46         .mapping        = &cpg_mapping,
  47 };
  48
  49 static struct clk extal2_clk = {
  50         .rate   = 48000000,
  51         .mapping        = &cpg_mapping,
  52 };
  53
  54 static struct clk *main_clks[] = {
  55         &extalr_clk,
  56         &extal1_clk,
  57         &extal2_clk,
  58 };
  59
  60 enum {
  61         MSTP217, MSTP216, MSTP207, MSTP206, MSTP204, MSTP203,
  62         MSTP522,
  63         MSTP_NR
  64 };
  65
  66 static struct clk mstp_clks[MSTP_NR] = {
  67         [MSTP204] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 4, 0), /* SCIFA0 */
  68         [MSTP203] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 3, 0), /* SCIFA1 */
  69         [MSTP206] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 6, 0), /* SCIFB0 */
  70         [MSTP207] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 7, 0), /* SCIFB1 */
  71         [MSTP216] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 16, 0), /* SCIFB2 */
  72         [MSTP217] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR2, 17, 0), /* SCIFB3 */
  73         [MSTP522] = SH_CLK_MSTP32(&extal2_clk, SMSTPCR5, 22, 0), /* Thermal */
  74 };
  75
  76 static struct clk_lookup lookups[] = {
  77         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP204]),
  78         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP203]),
  79         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP206]),
  80         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP207]),
  81         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP216]),
  82         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP217]),
  83         CLKDEV_DEV_ID("rcar_thermal", &mstp_clks[MSTP522]),
  84
  85         /* for DT */
  86         CLKDEV_DEV_ID("e61f0000.thermal", &mstp_clks[MSTP522]),
  87 };
  88
  89 void __init r8a73a4_clock_init(void)
  90 {
  91         void __iomem *cpg_base, *reg;
  92         int k, ret = 0;
  93
  94         /* fix MPCLK to EXTAL2 for now.
  95          * this is needed until more detailed clock topology is supported
  96          */
  97         cpg_base = ioremap_nocache(CPG_BASE, CPG_LEN);
  98         BUG_ON(!cpg_base);
  99         reg = cpg_base + (MPCKCR - CPG_BASE);
 100         iowrite32(ioread32(reg) | 1 << 7 | 0x0c, reg); /* set CKSEL */
 101         iounmap(cpg_base);
 102
 103         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 104                 ret = clk_register(main_clks[k]);
 105
 106         if (!ret)
 107                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 108
 109         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 110
 111         if (!ret)
 112                 shmobile_clk_init();
 113         else
 114                 panic("failed to setup r8a73a4 clocks\n");
 115 }