arch/arm/mach-rockchip/rockchip.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Device Tree support for Rockchip SoCs
   4  *
   5  * Copyright (c) 2013 MundoReader S.L.
   6  * Author: Heiko Stuebner <heiko@sntech.de>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/io.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/irqchip.h>
  14 #include <linux/clk-provider.h>
  15 #include <linux/clocksource.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/regmap.h>
  18 #include <asm/mach/arch.h>
  19 #include <asm/mach/map.h>
  20 #include <asm/hardware/cache-l2x0.h>
  21 #include "core.h"
  22 #include "pm.h"
  23
  24 #define RK3288_TIMER6_7_PHYS 0xff810000
  25
  26 static void __init rockchip_timer_init(void)
  27 {
  28         if (of_machine_is_compatible("rockchip,rk3288")) {
  29                 void __iomem *reg_base;
  30
  31                 /*
  32                  * Most/all uboot versions for rk3288 don't enable timer7
  33                  * which is needed for the architected timer to work.
  34                  * So make sure it is running during early boot.
  35                  */
  36                 reg_base = ioremap(RK3288_TIMER6_7_PHYS, SZ_16K);
  37                 if (reg_base) {
  38                         writel(0, reg_base + 0x30);
  39                         writel(0xffffffff, reg_base + 0x20);
  40                         writel(0xffffffff, reg_base + 0x24);
  41                         writel(1, reg_base + 0x30);
  42                         dsb();
  43                         iounmap(reg_base);
  44                 } else {
  45                         pr_err("rockchip: could not map timer7 registers\n");
  46                 }
  47         }
  48
  49         of_clk_init(NULL);
  50         timer_probe();
  51 }
  52
  53 static void __init rockchip_dt_init(void)
  54 {
  55         rockchip_suspend_init();
  56 }
  57
  58 static const char * const rockchip_board_dt_compat[] = {
  59         "rockchip,rk2928",
  60         "rockchip,rk3066a",
  61         "rockchip,rk3066b",
  62         "rockchip,rk3188",
  63         "rockchip,rk3228",
  64         "rockchip,rk3288",
  65         "rockchip,rv1108",
  66         NULL,
  67 };
  68
  69 DT_MACHINE_START(ROCKCHIP_DT, "Rockchip (Device Tree)")
  70         .l2c_aux_val    = 0,
  71         .l2c_aux_mask   = ~0,
  72         .init_time      = rockchip_timer_init,
  73         .dt_compat      = rockchip_board_dt_compat,
  74         .init_machine   = rockchip_dt_init,
  75 MACHINE_END