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Linux/drivers/clk/versatile/clk-vexpress.c

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License version 2 as
  4  * published by the Free Software Foundation.
  5  *
  6  * This program is distributed in the hope that it will be useful,
  7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  * GNU General Public License for more details.
 10  *
 11  * Copyright (C) 2012 ARM Limited
 12  */
 13 
 14 #include <linux/amba/sp810.h>
 15 #include <linux/clkdev.h>
 16 #include <linux/clk-provider.h>
 17 #include <linux/err.h>
 18 #include <linux/vexpress.h>
 19 
 20 static struct clk *vexpress_sp810_timerclken[4];
 21 static DEFINE_SPINLOCK(vexpress_sp810_lock);
 22 
 23 static void __init vexpress_sp810_init(void __iomem *base)
 24 {
 25         int i;
 26 
 27         if (WARN_ON(!base))
 28                 return;
 29 
 30         for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) {
 31                 char name[12];
 32                 const char *parents[] = {
 33                         "v2m:refclk32khz", /* REFCLK */
 34                         "v2m:refclk1mhz" /* TIMCLK */
 35                 };
 36 
 37                 snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
 38 
 39                 vexpress_sp810_timerclken[i] = clk_register_mux(NULL, name,
 40                                 parents, 2, CLK_SET_RATE_NO_REPARENT,
 41                                 base + SCCTRL, SCCTRL_TIMERENnSEL_SHIFT(i), 1,
 42                                 0, &vexpress_sp810_lock);
 43 
 44                 if (WARN_ON(IS_ERR(vexpress_sp810_timerclken[i])))
 45                         break;
 46         }
 47 }
 48 
 49 
 50 static const char * const vexpress_clk_24mhz_periphs[] __initconst = {
 51         "mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3",
 52         "mb:mmci", "mb:kmi0", "mb:kmi1"
 53 };
 54 
 55 void __init vexpress_clk_init(void __iomem *sp810_base)
 56 {
 57         struct clk *clk;
 58         int i;
 59 
 60         clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
 61                         CLK_IS_ROOT, 0);
 62         WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));
 63 
 64         clk = clk_register_fixed_rate(NULL, "v2m:clk_24mhz", NULL,
 65                         CLK_IS_ROOT, 24000000);
 66         for (i = 0; i < ARRAY_SIZE(vexpress_clk_24mhz_periphs); i++)
 67                 WARN_ON(clk_register_clkdev(clk, NULL,
 68                                 vexpress_clk_24mhz_periphs[i]));
 69 
 70         clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL,
 71                         CLK_IS_ROOT, 32768);
 72         WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt"));
 73 
 74         clk = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL,
 75                         CLK_IS_ROOT, 1000000);
 76 
 77         vexpress_sp810_init(sp810_base);
 78 
 79         for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++)
 80                 WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], clk));
 81 
 82         WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0],
 83                                 "v2m-timer0", "sp804"));
 84         WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1],
 85                                 "v2m-timer1", "sp804"));
 86 }
 87 

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