arch/mips/ralink/mt7621.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2015 Nikolay Martynov <mar.kolya@gmail.com>
   5  * Copyright (C) 2015 John Crispin <john@phrozen.org>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/sys_soc.h>
  12
  13 #include <asm/mipsregs.h>
  14 #include <asm/smp-ops.h>
  15 #include <asm/mips-cps.h>
  16 #include <asm/mach-ralink/ralink_regs.h>
  17 #include <asm/mach-ralink/mt7621.h>
  18
  19 #include <pinmux.h>
  20
  21 #include "common.h"
  22
  23 #define SYSC_REG_SYSCFG         0x10
  24 #define SYSC_REG_CPLL_CLKCFG0   0x2c
  25 #define SYSC_REG_CUR_CLK_STS    0x44
  26 #define CPU_CLK_SEL             (BIT(30) | BIT(31))
  27
  28 #define MT7621_GPIO_MODE_UART1          1
  29 #define MT7621_GPIO_MODE_I2C            2
  30 #define MT7621_GPIO_MODE_UART3_MASK     0x3
  31 #define MT7621_GPIO_MODE_UART3_SHIFT    3
  32 #define MT7621_GPIO_MODE_UART3_GPIO     1
  33 #define MT7621_GPIO_MODE_UART2_MASK     0x3
  34 #define MT7621_GPIO_MODE_UART2_SHIFT    5
  35 #define MT7621_GPIO_MODE_UART2_GPIO     1
  36 #define MT7621_GPIO_MODE_JTAG           7
  37 #define MT7621_GPIO_MODE_WDT_MASK       0x3
  38 #define MT7621_GPIO_MODE_WDT_SHIFT      8
  39 #define MT7621_GPIO_MODE_WDT_GPIO       1
  40 #define MT7621_GPIO_MODE_PCIE_RST       0
  41 #define MT7621_GPIO_MODE_PCIE_REF       2
  42 #define MT7621_GPIO_MODE_PCIE_MASK      0x3
  43 #define MT7621_GPIO_MODE_PCIE_SHIFT     10
  44 #define MT7621_GPIO_MODE_PCIE_GPIO      1
  45 #define MT7621_GPIO_MODE_MDIO_MASK      0x3
  46 #define MT7621_GPIO_MODE_MDIO_SHIFT     12
  47 #define MT7621_GPIO_MODE_MDIO_GPIO      1
  48 #define MT7621_GPIO_MODE_RGMII1         14
  49 #define MT7621_GPIO_MODE_RGMII2         15
  50 #define MT7621_GPIO_MODE_SPI_MASK       0x3
  51 #define MT7621_GPIO_MODE_SPI_SHIFT      16
  52 #define MT7621_GPIO_MODE_SPI_GPIO       1
  53 #define MT7621_GPIO_MODE_SDHCI_MASK     0x3
  54 #define MT7621_GPIO_MODE_SDHCI_SHIFT    18
  55 #define MT7621_GPIO_MODE_SDHCI_GPIO     1
  56
  57 static struct rt2880_pmx_func uart1_grp[] =  { FUNC("uart1", 0, 1, 2) };
  58 static struct rt2880_pmx_func i2c_grp[] =  { FUNC("i2c", 0, 3, 2) };
  59 static struct rt2880_pmx_func uart3_grp[] = {
  60         FUNC("uart3", 0, 5, 4),
  61         FUNC("i2s", 2, 5, 4),
  62         FUNC("spdif3", 3, 5, 4),
  63 };
  64 static struct rt2880_pmx_func uart2_grp[] = {
  65         FUNC("uart2", 0, 9, 4),
  66         FUNC("pcm", 2, 9, 4),
  67         FUNC("spdif2", 3, 9, 4),
  68 };
  69 static struct rt2880_pmx_func jtag_grp[] = { FUNC("jtag", 0, 13, 5) };
  70 static struct rt2880_pmx_func wdt_grp[] = {
  71         FUNC("wdt rst", 0, 18, 1),
  72         FUNC("wdt refclk", 2, 18, 1),
  73 };
  74 static struct rt2880_pmx_func pcie_rst_grp[] = {
  75         FUNC("pcie rst", MT7621_GPIO_MODE_PCIE_RST, 19, 1),
  76         FUNC("pcie refclk", MT7621_GPIO_MODE_PCIE_REF, 19, 1)
  77 };
  78 static struct rt2880_pmx_func mdio_grp[] = { FUNC("mdio", 0, 20, 2) };
  79 static struct rt2880_pmx_func rgmii2_grp[] = { FUNC("rgmii2", 0, 22, 12) };
  80 static struct rt2880_pmx_func spi_grp[] = {
  81         FUNC("spi", 0, 34, 7),
  82         FUNC("nand1", 2, 34, 7),
  83 };
  84 static struct rt2880_pmx_func sdhci_grp[] = {
  85         FUNC("sdhci", 0, 41, 8),
  86         FUNC("nand2", 2, 41, 8),
  87 };
  88 static struct rt2880_pmx_func rgmii1_grp[] = { FUNC("rgmii1", 0, 49, 12) };
  89
  90 static struct rt2880_pmx_group mt7621_pinmux_data[] = {
  91         GRP("uart1", uart1_grp, 1, MT7621_GPIO_MODE_UART1),
  92         GRP("i2c", i2c_grp, 1, MT7621_GPIO_MODE_I2C),
  93         GRP_G("uart3", uart3_grp, MT7621_GPIO_MODE_UART3_MASK,
  94                 MT7621_GPIO_MODE_UART3_GPIO, MT7621_GPIO_MODE_UART3_SHIFT),
  95         GRP_G("uart2", uart2_grp, MT7621_GPIO_MODE_UART2_MASK,
  96                 MT7621_GPIO_MODE_UART2_GPIO, MT7621_GPIO_MODE_UART2_SHIFT),
  97         GRP("jtag", jtag_grp, 1, MT7621_GPIO_MODE_JTAG),
  98         GRP_G("wdt", wdt_grp, MT7621_GPIO_MODE_WDT_MASK,
  99                 MT7621_GPIO_MODE_WDT_GPIO, MT7621_GPIO_MODE_WDT_SHIFT),
 100         GRP_G("pcie", pcie_rst_grp, MT7621_GPIO_MODE_PCIE_MASK,
 101                 MT7621_GPIO_MODE_PCIE_GPIO, MT7621_GPIO_MODE_PCIE_SHIFT),
 102         GRP_G("mdio", mdio_grp, MT7621_GPIO_MODE_MDIO_MASK,
 103                 MT7621_GPIO_MODE_MDIO_GPIO, MT7621_GPIO_MODE_MDIO_SHIFT),
 104         GRP("rgmii2", rgmii2_grp, 1, MT7621_GPIO_MODE_RGMII2),
 105         GRP_G("spi", spi_grp, MT7621_GPIO_MODE_SPI_MASK,
 106                 MT7621_GPIO_MODE_SPI_GPIO, MT7621_GPIO_MODE_SPI_SHIFT),
 107         GRP_G("sdhci", sdhci_grp, MT7621_GPIO_MODE_SDHCI_MASK,
 108                 MT7621_GPIO_MODE_SDHCI_GPIO, MT7621_GPIO_MODE_SDHCI_SHIFT),
 109         GRP("rgmii1", rgmii1_grp, 1, MT7621_GPIO_MODE_RGMII1),
 110         { 0 }
 111 };
 112
 113 phys_addr_t mips_cpc_default_phys_base(void)
 114 {
 115         panic("Cannot detect cpc address");
 116 }
 117
 118 void __init ralink_clk_init(void)
 119 {
 120         int cpu_fdiv = 0;
 121         int cpu_ffrac = 0;
 122         int fbdiv = 0;
 123         u32 clk_sts, syscfg;
 124         u8 clk_sel = 0, xtal_mode;
 125         u32 cpu_clk;
 126
 127         if ((rt_sysc_r32(SYSC_REG_CPLL_CLKCFG0) & CPU_CLK_SEL) != 0)
 128                 clk_sel = 1;
 129
 130         switch (clk_sel) {
 131         case 0:
 132                 clk_sts = rt_sysc_r32(SYSC_REG_CUR_CLK_STS);
 133                 cpu_fdiv = ((clk_sts >> 8) & 0x1F);
 134                 cpu_ffrac = (clk_sts & 0x1F);
 135                 cpu_clk = (500 * cpu_ffrac / cpu_fdiv) * 1000 * 1000;
 136                 break;
 137
 138         case 1:
 139                 fbdiv = ((rt_sysc_r32(0x648) >> 4) & 0x7F) + 1;
 140                 syscfg = rt_sysc_r32(SYSC_REG_SYSCFG);
 141                 xtal_mode = (syscfg >> 6) & 0x7;
 142                 if (xtal_mode >= 6) {
 143                         /* 25Mhz Xtal */
 144                         cpu_clk = 25 * fbdiv * 1000 * 1000;
 145                 } else if (xtal_mode >= 3) {
 146                         /* 40Mhz Xtal */
 147                         cpu_clk = 40 * fbdiv * 1000 * 1000;
 148                 } else {
 149                         /* 20Mhz Xtal */
 150                         cpu_clk = 20 * fbdiv * 1000 * 1000;
 151                 }
 152                 break;
 153         }
 154 }
 155
 156 void __init ralink_of_remap(void)
 157 {
 158         rt_sysc_membase = plat_of_remap_node("mtk,mt7621-sysc");
 159         rt_memc_membase = plat_of_remap_node("mtk,mt7621-memc");
 160
 161         if (!rt_sysc_membase || !rt_memc_membase)
 162                 panic("Failed to remap core resources");
 163 }
 164
 165 static void soc_dev_init(struct ralink_soc_info *soc_info, u32 rev)
 166 {
 167         struct soc_device *soc_dev;
 168         struct soc_device_attribute *soc_dev_attr;
 169
 170         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 171         if (!soc_dev_attr)
 172                 return;
 173
 174         soc_dev_attr->soc_id = "mt7621";
 175         soc_dev_attr->family = "Ralink";
 176
 177         if (((rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK) == 1 &&
 178             (rev & CHIP_REV_ECO_MASK) == 1)
 179                 soc_dev_attr->revision = "E2";
 180         else
 181                 soc_dev_attr->revision = "E1";
 182
 183         soc_dev_attr->data = soc_info;
 184
 185         soc_dev = soc_device_register(soc_dev_attr);
 186         if (IS_ERR(soc_dev)) {
 187                 kfree(soc_dev_attr);
 188                 return;
 189         }
 190 }
 191
 192 void prom_soc_init(struct ralink_soc_info *soc_info)
 193 {
 194         void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7621_SYSC_BASE);
 195         unsigned char *name = NULL;
 196         u32 n0;
 197         u32 n1;
 198         u32 rev;
 199
 200         /* Early detection of CMP support */
 201         mips_cm_probe();
 202         mips_cpc_probe();
 203
 204         if (mips_cps_numiocu(0)) {
 205                 /*
 206                  * mips_cm_probe() wipes out bootloader
 207                  * config for CM regions and we have to configure them
 208                  * again. This SoC cannot talk to pamlbus devices
 209                  * witout proper iocu region set up.
 210                  *
 211                  * FIXME: it would be better to do this with values
 212                  * from DT, but we need this very early because
 213                  * without this we cannot talk to pretty much anything
 214                  * including serial.
 215                  */
 216                 write_gcr_reg0_base(MT7621_PALMBUS_BASE);
 217                 write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE |
 218                                     CM_GCR_REGn_MASK_CMTGT_IOCU0);
 219                 __sync();
 220         }
 221
 222         n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
 223         n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
 224
 225         if (n0 == MT7621_CHIP_NAME0 && n1 == MT7621_CHIP_NAME1) {
 226                 name = "MT7621";
 227                 soc_info->compatible = "mtk,mt7621-soc";
 228         } else {
 229                 panic("mt7621: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
 230         }
 231         ralink_soc = MT762X_SOC_MT7621AT;
 232         rev = __raw_readl(sysc + SYSC_REG_CHIP_REV);
 233
 234         snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
 235                 "MediaTek %s ver:%u eco:%u",
 236                 name,
 237                 (rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
 238                 (rev & CHIP_REV_ECO_MASK));
 239
 240         soc_info->mem_size_min = MT7621_DDR2_SIZE_MIN;
 241         soc_info->mem_size_max = MT7621_DDR2_SIZE_MAX;
 242         soc_info->mem_base = MT7621_DRAM_BASE;
 243
 244         rt2880_pinmux_data = mt7621_pinmux_data;
 245
 246         soc_dev_init(soc_info, rev);
 247
 248         if (!register_cps_smp_ops())
 249                 return;
 250         if (!register_cmp_smp_ops())
 251                 return;
 252         if (!register_vsmp_smp_ops())
 253                 return;
 254 }