arch/mips/mach-ath79/reset.c

   1 /*
   2  * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/errno.h>
   9 #include <asm/io.h>
  10 #include <asm/addrspace.h>
  11 #include <asm/types.h>
  12 #include <mach/ath79.h>
  13 #include <mach/ar71xx_regs.h>
  14
  15 void _machine_restart(void)
  16 {
  17         void __iomem *base;
  18         u32 reg = 0;
  19
  20         base = map_physmem(AR71XX_RESET_BASE, AR71XX_RESET_SIZE,
  21                            MAP_NOCACHE);
  22         if (soc_is_ar71xx())
  23                 reg = AR71XX_RESET_REG_RESET_MODULE;
  24         else if (soc_is_ar724x())
  25                 reg = AR724X_RESET_REG_RESET_MODULE;
  26         else if (soc_is_ar913x())
  27                 reg = AR913X_RESET_REG_RESET_MODULE;
  28         else if (soc_is_ar933x())
  29                 reg = AR933X_RESET_REG_RESET_MODULE;
  30         else if (soc_is_ar934x())
  31                 reg = AR934X_RESET_REG_RESET_MODULE;
  32         else if (soc_is_qca953x())
  33                 reg = QCA953X_RESET_REG_RESET_MODULE;
  34         else if (soc_is_qca955x())
  35                 reg = QCA955X_RESET_REG_RESET_MODULE;
  36         else if (soc_is_qca956x())
  37                 reg = QCA956X_RESET_REG_RESET_MODULE;
  38         else
  39                 puts("Reset register not defined for this SOC\n");
  40
  41         if (reg)
  42                 setbits_be32(base + reg, AR71XX_RESET_FULL_CHIP);
  43
  44         while (1)
  45                 /* NOP */;
  46 }
  47
  48 u32 ath79_get_bootstrap(void)
  49 {
  50         void __iomem *base;
  51         u32 reg = 0;
  52
  53         base = map_physmem(AR71XX_RESET_BASE, AR71XX_RESET_SIZE,
  54                            MAP_NOCACHE);
  55         if (soc_is_ar933x())
  56                 reg = AR933X_RESET_REG_BOOTSTRAP;
  57         else if (soc_is_ar934x())
  58                 reg = AR934X_RESET_REG_BOOTSTRAP;
  59         else if (soc_is_qca953x())
  60                 reg = QCA953X_RESET_REG_BOOTSTRAP;
  61         else if (soc_is_qca955x())
  62                 reg = QCA955X_RESET_REG_BOOTSTRAP;
  63         else if (soc_is_qca956x())
  64                 reg = QCA956X_RESET_REG_BOOTSTRAP;
  65         else
  66                 puts("Bootstrap register not defined for this SOC\n");
  67
  68         if (reg)
  69                 return readl(base + reg);
  70
  71         return 0;
  72 }
  73
  74 static int eth_init_ar933x(void)
  75 {
  76         void __iomem *rregs = map_physmem(AR71XX_RESET_BASE, AR71XX_RESET_SIZE,
  77                                           MAP_NOCACHE);
  78         void __iomem *pregs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
  79                                           MAP_NOCACHE);
  80         void __iomem *gregs = map_physmem(AR933X_GMAC_BASE, AR933X_GMAC_SIZE,
  81                                           MAP_NOCACHE);
  82         const u32 mask = AR933X_RESET_GE0_MAC | AR933X_RESET_GE0_MDIO |
  83                          AR933X_RESET_GE1_MAC | AR933X_RESET_GE1_MDIO |
  84                          AR933X_RESET_ETH_SWITCH |
  85                          AR933X_RESET_ETH_SWITCH_ANALOG;
  86
  87         /* Clear MDIO slave EN bit. */
  88         clrbits_be32(rregs + AR933X_RESET_REG_BOOTSTRAP, BIT(17));
  89         mdelay(10);
  90
  91         /* Get Atheros S26 PHY out of reset. */
  92         clrsetbits_be32(pregs + AR934X_PLL_SWITCH_CLOCK_CONTROL_REG,
  93                         0x1f, 0x10);
  94         mdelay(10);
  95
  96         setbits_be32(rregs + AR933X_RESET_REG_RESET_MODULE, mask);
  97         mdelay(10);
  98         clrbits_be32(rregs + AR933X_RESET_REG_RESET_MODULE, mask);
  99         mdelay(10);
 100
 101         /* Configure AR93xx GMAC register. */
 102         clrsetbits_be32(gregs + AR933X_GMAC_REG_ETH_CFG,
 103                         AR933X_ETH_CFG_MII_GE0_MASTER |
 104                         AR933X_ETH_CFG_MII_GE0_SLAVE,
 105                         AR933X_ETH_CFG_MII_GE0_SLAVE);
 106         return 0;
 107 }
 108
 109 static int eth_init_ar934x(void)
 110 {
 111         void __iomem *rregs = map_physmem(AR71XX_RESET_BASE, AR71XX_RESET_SIZE,
 112                                           MAP_NOCACHE);
 113         void __iomem *pregs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
 114                                           MAP_NOCACHE);
 115         void __iomem *gregs = map_physmem(AR934X_GMAC_BASE, AR934X_GMAC_SIZE,
 116                                           MAP_NOCACHE);
 117         const u32 mask = AR934X_RESET_GE0_MAC | AR934X_RESET_GE0_MDIO |
 118                          AR934X_RESET_GE1_MAC | AR934X_RESET_GE1_MDIO |
 119                          AR934X_RESET_ETH_SWITCH_ANALOG;
 120         u32 reg;
 121
 122         reg = readl(rregs + AR934X_RESET_REG_BOOTSTRAP);
 123         if (reg & AR934X_BOOTSTRAP_REF_CLK_40)
 124                 writel(0x570, pregs + AR934X_PLL_SWITCH_CLOCK_CONTROL_REG);
 125         else
 126                 writel(0x271, pregs + AR934X_PLL_SWITCH_CLOCK_CONTROL_REG);
 127         writel(BIT(26) | BIT(25), pregs + AR934X_PLL_ETH_XMII_CONTROL_REG);
 128
 129         setbits_be32(rregs + AR934X_RESET_REG_RESET_MODULE, mask);
 130         mdelay(1);
 131         clrbits_be32(rregs + AR934X_RESET_REG_RESET_MODULE, mask);
 132         mdelay(1);
 133
 134         /* Configure AR934x GMAC register. */
 135         writel(AR934X_ETH_CFG_RGMII_GMAC0, gregs + AR934X_GMAC_REG_ETH_CFG);
 136         return 0;
 137 }
 138
 139 int ath79_eth_reset(void)
 140 {
 141         /*
 142          * Un-reset ethernet. DM still doesn't have any notion of reset
 143          * framework, so we do it by hand here.
 144          */
 145         if (soc_is_ar933x())
 146                 return eth_init_ar933x();
 147         if (soc_is_ar934x())
 148                 return eth_init_ar934x();
 149
 150         return -EINVAL;
 151 }
 152
 153 static int usb_reset_ar933x(void __iomem *reset_regs)
 154 {
 155         /* Ungate the USB block */
 156         setbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
 157                      AR933X_RESET_USBSUS_OVERRIDE);
 158         mdelay(1);
 159         clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
 160                      AR933X_RESET_USB_HOST);
 161         mdelay(1);
 162         clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
 163                      AR933X_RESET_USB_PHY);
 164         mdelay(1);
 165
 166         return 0;
 167 }
 168
 169 static int usb_reset_ar934x(void __iomem *reset_regs)
 170 {
 171         /* Ungate the USB block */
 172         setbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
 173                      AR934X_RESET_USBSUS_OVERRIDE);
 174         mdelay(1);
 175         clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
 176                      AR934X_RESET_USB_PHY);
 177         mdelay(1);
 178         clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
 179                      AR934X_RESET_USB_PHY_ANALOG);
 180         mdelay(1);
 181         clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
 182                      AR934X_RESET_USB_HOST);
 183         mdelay(1);
 184
 185         return 0;
 186 }
 187
 188 int ath79_usb_reset(void)
 189 {
 190         void __iomem *usbc_regs = map_physmem(AR71XX_USB_CTRL_BASE,
 191                                               AR71XX_USB_CTRL_SIZE,
 192                                               MAP_NOCACHE);
 193         void __iomem *reset_regs = map_physmem(AR71XX_RESET_BASE,
 194                                                AR71XX_RESET_SIZE,
 195                                                MAP_NOCACHE);
 196         /*
 197          * Turn on the Buff and Desc swap bits.
 198          * NOTE: This write into an undocumented register in mandatory to
 199          *       get the USB controller operational in BigEndian mode.
 200          */
 201         writel(0xf0000, usbc_regs + AR71XX_USB_CTRL_REG_CONFIG);
 202
 203         if (soc_is_ar933x())
 204                 return usb_reset_ar933x(reset_regs);
 205         if (soc_is_ar934x())
 206                 return usb_reset_ar934x(reset_regs);
 207
 208         return -EINVAL;
 209 }