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.h>
  13 #include <linux/of_clk.h>
  14 #include <linux/clocksource.h>
  15 #include <asm/mach/arch.h>
  16 #include <asm/mach/map.h>
  17 #include "core.h"
  18 #include "pm.h"
  19
  20 #define RK3288_TIMER6_7_PHYS 0xff810000
  21
  22 static void __init rockchip_timer_init(void)
  23 {
  24         if (of_machine_is_compatible("rockchip,rk3288")) {
  25                 void __iomem *reg_base;
  26
  27                 /*
  28                  * Most/all uboot versions for rk3288 don't enable timer7
  29                  * which is needed for the architected timer to work.
  30                  * So make sure it is running during early boot.
  31                  */
  32                 reg_base = ioremap(RK3288_TIMER6_7_PHYS, SZ_16K);
  33                 if (reg_base) {
  34                         writel(0, reg_base + 0x30);
  35                         writel(0xffffffff, reg_base + 0x20);
  36                         writel(0xffffffff, reg_base + 0x24);
  37                         writel(1, reg_base + 0x30);
  38                         dsb();
  39                         iounmap(reg_base);
  40                 } else {
  41                         pr_err("rockchip: could not map timer7 registers\n");
  42                 }
  43         }
  44
  45         of_clk_init(NULL);
  46         timer_probe();
  47 }
  48
  49 static void __init rockchip_dt_init(void)
  50 {
  51         rockchip_suspend_init();
  52 }
  53
  54 static const char * const rockchip_board_dt_compat[] = {
  55         "rockchip,rk2928",
  56         "rockchip,rk3066a",
  57         "rockchip,rk3066b",
  58         "rockchip,rk3188",
  59         "rockchip,rk3228",
  60         "rockchip,rk3288",
  61         "rockchip,rv1108",
  62         NULL,
  63 };
  64
  65 DT_MACHINE_START(ROCKCHIP_DT, "Rockchip (Device Tree)")
  66         .l2c_aux_val    = 0,
  67         .l2c_aux_mask   = ~0,
  68         .init_time      = rockchip_timer_init,
  69         .dt_compat      = rockchip_board_dt_compat,
  70         .init_machine   = rockchip_dt_init,
  71 MACHINE_END