arch/arm/mach-sunxi/clock.c

   1 /*
   2  * (C) Copyright 2007-2012
   3  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   4  * Tom Cubie <tangliang@allwinnertech.com>
   5  *
   6  * (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/gpio.h>
  15 #include <asm/arch/prcm.h>
  16 #include <asm/arch/gtbus.h>
  17 #include <asm/arch/sys_proto.h>
  18
  19 __weak void clock_init_sec(void)
  20 {
  21 }
  22
  23 __weak void gtbus_init(void)
  24 {
  25 }
  26
  27 int clock_init(void)
  28 {
  29 #ifdef CONFIG_SPL_BUILD
  30         clock_init_safe();
  31         gtbus_init();
  32 #endif
  33         clock_init_uart();
  34         clock_init_sec();
  35
  36         return 0;
  37 }
  38
  39 /* These functions are shared between various SoCs so put them here. */
  40 #if defined CONFIG_SUNXI_GEN_SUN6I && !defined CONFIG_MACH_SUN9I
  41 int clock_twi_onoff(int port, int state)
  42 {
  43         struct sunxi_ccm_reg *const ccm =
  44                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  45
  46         if (port == 5) {
  47                 if (state)
  48                         prcm_apb0_enable(
  49                                 PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
  50                 else
  51                         prcm_apb0_disable(
  52                                 PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
  53                 return 0;
  54         }
  55
  56         /* set the apb clock gate and reset for twi */
  57         if (state) {
  58                 setbits_le32(&ccm->apb2_gate,
  59                              CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT + port));
  60                 setbits_le32(&ccm->apb2_reset_cfg,
  61                              1 << (APB2_RESET_TWI_SHIFT + port));
  62         } else {
  63                 clrbits_le32(&ccm->apb2_reset_cfg,
  64                              1 << (APB2_RESET_TWI_SHIFT + port));
  65                 clrbits_le32(&ccm->apb2_gate,
  66                              CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT + port));
  67         }
  68
  69         return 0;
  70 }
  71 #endif