arch/mips/ralink/mt7621.c

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