drivers/clk/owl/clk_owl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Common clock driver for Actions Semi SoCs.
   4  *
   5  * Copyright (C) 2015 Actions Semi Co., Ltd.
   6  * Copyright (C) 2018 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include "clk_owl.h"
  12 #include <asm/io.h>
  13 #if defined(CONFIG_MACH_S900)
  14 #include <asm/arch-owl/regs_s900.h>
  15 #include <dt-bindings/clock/actions,s900-cmu.h>
  16 #elif defined(CONFIG_MACH_S700)
  17 #include <asm/arch-owl/regs_s700.h>
  18 #include <dt-bindings/clock/actions,s700-cmu.h>
  19 #endif
  20 #include <linux/bitops.h>
  21 #include <linux/delay.h>
  22
  23 void owl_clk_init(struct owl_clk_priv *priv)
  24 {
  25         u32 bus_clk = 0, core_pll, dev_pll;
  26
  27 #if defined(CONFIG_MACH_S900)
  28         /* Enable ASSIST_PLL */
  29         setbits_le32(priv->base + CMU_ASSISTPLL, BIT(0));
  30         udelay(PLL_STABILITY_WAIT_US);
  31 #endif
  32
  33         /* Source HOSC to DEV_CLK */
  34         clrbits_le32(priv->base + CMU_DEVPLL, CMU_DEVPLL_CLK);
  35
  36         /* Configure BUS_CLK */
  37         bus_clk |= (CMU_PDBGDIV_DIV | CMU_PERDIV_DIV | CMU_NOCDIV_DIV |
  38                         CMU_DMMCLK_SRC | CMU_APBCLK_DIV | CMU_AHBCLK_DIV |
  39                         CMU_NOCCLK_SRC | CMU_CORECLK_HOSC);
  40         writel(bus_clk, priv->base + CMU_BUSCLK);
  41
  42         udelay(PLL_STABILITY_WAIT_US);
  43
  44         /* Configure CORE_PLL */
  45         core_pll = readl(priv->base + CMU_COREPLL);
  46         core_pll |= (CMU_COREPLL_EN | CMU_COREPLL_HOSC_EN | CMU_COREPLL_OUT);
  47         writel(core_pll, priv->base + CMU_COREPLL);
  48
  49         udelay(PLL_STABILITY_WAIT_US);
  50
  51         /* Configure DEV_PLL */
  52         dev_pll = readl(priv->base + CMU_DEVPLL);
  53         dev_pll |= (CMU_DEVPLL_EN | CMU_DEVPLL_OUT);
  54         writel(dev_pll, priv->base + CMU_DEVPLL);
  55
  56         udelay(PLL_STABILITY_WAIT_US);
  57
  58         /* Source CORE_PLL for CORE_CLK */
  59         clrsetbits_le32(priv->base + CMU_BUSCLK, CMU_CORECLK_MASK,
  60                         CMU_CORECLK_CPLL);
  61
  62         /* Source DEV_PLL for DEV_CLK */
  63         setbits_le32(priv->base + CMU_DEVPLL, CMU_DEVPLL_CLK);
  64
  65         udelay(PLL_STABILITY_WAIT_US);
  66 }
  67
  68 int owl_clk_enable(struct clk *clk)
  69 {
  70         struct owl_clk_priv *priv = dev_get_priv(clk->dev);
  71         enum owl_soc model = dev_get_driver_data(clk->dev);
  72
  73         switch (clk->id) {
  74         case CLK_UART5:
  75                 if (model != S900)
  76                         return -EINVAL;
  77                 /* Source HOSC for UART5 interface */
  78                 clrbits_le32(priv->base + CMU_UART5CLK, CMU_UARTCLK_SRC_DEVPLL);
  79                 /* Enable UART5 interface clock */
  80                 setbits_le32(priv->base + CMU_DEVCLKEN1, CMU_DEVCLKEN1_UART5);
  81                 break;
  82         case CLK_UART3:
  83                 if (model != S700)
  84                         return -EINVAL;
  85                 /* Source HOSC for UART3 interface */
  86                 clrbits_le32(priv->base + CMU_UART3CLK, CMU_UARTCLK_SRC_DEVPLL);
  87                 /* Enable UART3 interface clock */
  88                 setbits_le32(priv->base + CMU_DEVCLKEN1, CMU_DEVCLKEN1_UART3);
  89                 break;
  90         default:
  91                 return -EINVAL;
  92         }
  93
  94         return 0;
  95 }
  96
  97 int owl_clk_disable(struct clk *clk)
  98 {
  99         struct owl_clk_priv *priv = dev_get_priv(clk->dev);
 100         enum owl_soc model = dev_get_driver_data(clk->dev);
 101
 102         switch (clk->id) {
 103         case CLK_UART5:
 104                 if (model != S900)
 105                         return -EINVAL;
 106                 /* Disable UART5 interface clock */
 107                 clrbits_le32(priv->base + CMU_DEVCLKEN1, CMU_DEVCLKEN1_UART5);
 108                 break;
 109         case CLK_UART3:
 110                 if (model != S700)
 111                         return -EINVAL;
 112                 /* Disable UART3 interface clock */
 113                 clrbits_le32(priv->base + CMU_DEVCLKEN1, CMU_DEVCLKEN1_UART3);
 114                 break;
 115         default:
 116                 return -EINVAL;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int owl_clk_probe(struct udevice *dev)
 123 {
 124         struct owl_clk_priv *priv = dev_get_priv(dev);
 125
 126         priv->base = dev_read_addr(dev);
 127         if (priv->base == FDT_ADDR_T_NONE)
 128                 return -EINVAL;
 129
 130         /* setup necessary clocks */
 131         owl_clk_init(priv);
 132
 133         return 0;
 134 }
 135
 136 static const struct clk_ops owl_clk_ops = {
 137         .enable = owl_clk_enable,
 138         .disable = owl_clk_disable,
 139 };
 140
 141 static const struct udevice_id owl_clk_ids[] = {
 142 #if defined(CONFIG_MACH_S900)
 143         { .compatible = "actions,s900-cmu", .data = S900 },
 144 #elif defined(CONFIG_MACH_S700)
 145         { .compatible = "actions,s700-cmu", .data = S700 },
 146 #endif
 147         { }
 148 };
 149
 150 U_BOOT_DRIVER(clk_owl) = {
 151         .name           = "clk_owl",
 152         .id             = UCLASS_CLK,
 153         .of_match       = owl_clk_ids,
 154         .ops            = &owl_clk_ops,
 155         .priv_auto_alloc_size = sizeof(struct owl_clk_priv),
 156         .probe          = owl_clk_probe,
 157 };