arch/arm/mach-cns3xxx/pm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2008 Cavium Networks
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/module.h>
   8 #include <linux/io.h>
   9 #include <linux/delay.h>
  10 #include <linux/atomic.h>
  11 #include "cns3xxx.h"
  12 #include "pm.h"
  13 #include "core.h"
  14
  15 void cns3xxx_pwr_clk_en(unsigned int block)
  16 {
  17         u32 reg = __raw_readl(PM_CLK_GATE_REG);
  18
  19         reg |= (block & PM_CLK_GATE_REG_MASK);
  20         __raw_writel(reg, PM_CLK_GATE_REG);
  21 }
  22 EXPORT_SYMBOL(cns3xxx_pwr_clk_en);
  23
  24 void cns3xxx_pwr_clk_dis(unsigned int block)
  25 {
  26         u32 reg = __raw_readl(PM_CLK_GATE_REG);
  27
  28         reg &= ~(block & PM_CLK_GATE_REG_MASK);
  29         __raw_writel(reg, PM_CLK_GATE_REG);
  30 }
  31 EXPORT_SYMBOL(cns3xxx_pwr_clk_dis);
  32
  33 void cns3xxx_pwr_power_up(unsigned int block)
  34 {
  35         u32 reg = __raw_readl(PM_PLL_HM_PD_CTRL_REG);
  36
  37         reg &= ~(block & CNS3XXX_PWR_PLL_ALL);
  38         __raw_writel(reg, PM_PLL_HM_PD_CTRL_REG);
  39
  40         /* Wait for 300us for the PLL output clock locked. */
  41         udelay(300);
  42 };
  43 EXPORT_SYMBOL(cns3xxx_pwr_power_up);
  44
  45 void cns3xxx_pwr_power_down(unsigned int block)
  46 {
  47         u32 reg = __raw_readl(PM_PLL_HM_PD_CTRL_REG);
  48
  49         /* write '1' to power down */
  50         reg |= (block & CNS3XXX_PWR_PLL_ALL);
  51         __raw_writel(reg, PM_PLL_HM_PD_CTRL_REG);
  52 };
  53 EXPORT_SYMBOL(cns3xxx_pwr_power_down);
  54
  55 static void cns3xxx_pwr_soft_rst_force(unsigned int block)
  56 {
  57         u32 reg = __raw_readl(PM_SOFT_RST_REG);
  58
  59         /*
  60          * bit 0, 28, 29 => program low to reset,
  61          * the other else program low and then high
  62          */
  63         if (block & 0x30000001) {
  64                 reg &= ~(block & PM_SOFT_RST_REG_MASK);
  65         } else {
  66                 reg &= ~(block & PM_SOFT_RST_REG_MASK);
  67                 __raw_writel(reg, PM_SOFT_RST_REG);
  68                 reg |= (block & PM_SOFT_RST_REG_MASK);
  69         }
  70
  71         __raw_writel(reg, PM_SOFT_RST_REG);
  72 }
  73
  74 void cns3xxx_pwr_soft_rst(unsigned int block)
  75 {
  76         static unsigned int soft_reset;
  77
  78         if (soft_reset & block) {
  79                 /* SPI/I2C/GPIO use the same block, reset once. */
  80                 return;
  81         } else {
  82                 soft_reset |= block;
  83         }
  84         cns3xxx_pwr_soft_rst_force(block);
  85 }
  86 EXPORT_SYMBOL(cns3xxx_pwr_soft_rst);
  87
  88 void cns3xxx_restart(enum reboot_mode mode, const char *cmd)
  89 {
  90         /*
  91          * To reset, we hit the on-board reset register
  92          * in the system FPGA.
  93          */
  94         cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(GLOBAL));
  95 }
  96
  97 /*
  98  * cns3xxx_cpu_clock - return CPU/L2 clock
  99  *  aclk: cpu clock/2
 100  *  hclk: cpu clock/4
 101  *  pclk: cpu clock/8
 102  */
 103 int cns3xxx_cpu_clock(void)
 104 {
 105         u32 reg = __raw_readl(PM_CLK_CTRL_REG);
 106         int cpu;
 107         int cpu_sel;
 108         int div_sel;
 109
 110         cpu_sel = (reg >> PM_CLK_CTRL_REG_OFFSET_PLL_CPU_SEL) & 0xf;
 111         div_sel = (reg >> PM_CLK_CTRL_REG_OFFSET_CPU_CLK_DIV) & 0x3;
 112
 113         cpu = (300 + ((cpu_sel / 3) * 100) + ((cpu_sel % 3) * 33)) >> div_sel;
 114
 115         return cpu;
 116 }
 117 EXPORT_SYMBOL(cns3xxx_cpu_clock);
 118
 119 atomic_t usb_pwr_ref = ATOMIC_INIT(0);
 120 EXPORT_SYMBOL(usb_pwr_ref);