arch/mips/lantiq/falcon/sysctrl.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) 2011 Thomas Langer <thomas.langer@lantiq.com>
   7  * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
   8  */
   9
  10 #include <linux/ioport.h>
  11 #include <linux/export.h>
  12 #include <linux/clkdev.h>
  13 #include <linux/of_address.h>
  14 #include <asm/delay.h>
  15
  16 #include <lantiq_soc.h>
  17
  18 #include "../clk.h"
  19
  20 /* infrastructure control register */
  21 #define SYS1_INFRAC             0x00bc
  22 /* Configuration fuses for drivers and pll */
  23 #define STATUS_CONFIG           0x0040
  24
  25 /* GPE frequency selection */
  26 #define GPPC_OFFSET             24
  27 #define GPEFREQ_MASK            0x00000C0
  28 #define GPEFREQ_OFFSET          10
  29 /* Clock status register */
  30 #define SYSCTL_CLKS             0x0000
  31 /* Clock enable register */
  32 #define SYSCTL_CLKEN            0x0004
  33 /* Clock clear register */
  34 #define SYSCTL_CLKCLR           0x0008
  35 /* Activation Status Register */
  36 #define SYSCTL_ACTS             0x0020
  37 /* Activation Register */
  38 #define SYSCTL_ACT              0x0024
  39 /* Deactivation Register */
  40 #define SYSCTL_DEACT            0x0028
  41 /* reboot Register */
  42 #define SYSCTL_RBT              0x002c
  43 /* CPU0 Clock Control Register */
  44 #define SYS1_CPU0CC             0x0040
  45 /* HRST_OUT_N Control Register */
  46 #define SYS1_HRSTOUTC           0x00c0
  47 /* clock divider bit */
  48 #define CPU0CC_CPUDIV           0x0001
  49
  50 /* Activation Status Register */
  51 #define ACTS_ASC1_ACT   0x00000800
  52 #define ACTS_I2C_ACT    0x00004000
  53 #define ACTS_P0         0x00010000
  54 #define ACTS_P1         0x00010000
  55 #define ACTS_P2         0x00020000
  56 #define ACTS_P3         0x00020000
  57 #define ACTS_P4         0x00040000
  58 #define ACTS_PADCTRL0   0x00100000
  59 #define ACTS_PADCTRL1   0x00100000
  60 #define ACTS_PADCTRL2   0x00200000
  61 #define ACTS_PADCTRL3   0x00200000
  62 #define ACTS_PADCTRL4   0x00400000
  63
  64 #define sysctl_w32(m, x, y)     ltq_w32((x), sysctl_membase[m] + (y))
  65 #define sysctl_r32(m, x)        ltq_r32(sysctl_membase[m] + (x))
  66 #define sysctl_w32_mask(m, clear, set, reg)     \
  67                 sysctl_w32(m, (sysctl_r32(m, reg) & ~(clear)) | (set), reg)
  68
  69 #define status_w32(x, y)        ltq_w32((x), status_membase + (y))
  70 #define status_r32(x)           ltq_r32(status_membase + (x))
  71
  72 static void __iomem *sysctl_membase[3], *status_membase;
  73 void __iomem *ltq_sys1_membase, *ltq_ebu_membase;
  74
  75 void falcon_trigger_hrst(int level)
  76 {
  77         sysctl_w32(SYSCTL_SYS1, level & 1, SYS1_HRSTOUTC);
  78 }
  79
  80 static inline void sysctl_wait(struct clk *clk,
  81                 unsigned int test, unsigned int reg)
  82 {
  83         int err = 1000000;
  84
  85         do {} while (--err && ((sysctl_r32(clk->module, reg)
  86                                         & clk->bits) != test));
  87         if (!err)
  88                 pr_err("module de/activation failed %d %08X %08X %08X\n",
  89                         clk->module, clk->bits, test,
  90                         sysctl_r32(clk->module, reg) & clk->bits);
  91 }
  92
  93 static int sysctl_activate(struct clk *clk)
  94 {
  95         sysctl_w32(clk->module, clk->bits, SYSCTL_CLKEN);
  96         sysctl_w32(clk->module, clk->bits, SYSCTL_ACT);
  97         sysctl_wait(clk, clk->bits, SYSCTL_ACTS);
  98         return 0;
  99 }
 100
 101 static void sysctl_deactivate(struct clk *clk)
 102 {
 103         sysctl_w32(clk->module, clk->bits, SYSCTL_CLKCLR);
 104         sysctl_w32(clk->module, clk->bits, SYSCTL_DEACT);
 105         sysctl_wait(clk, 0, SYSCTL_ACTS);
 106 }
 107
 108 static int sysctl_clken(struct clk *clk)
 109 {
 110         sysctl_w32(clk->module, clk->bits, SYSCTL_CLKEN);
 111         sysctl_wait(clk, clk->bits, SYSCTL_CLKS);
 112         return 0;
 113 }
 114
 115 static void sysctl_clkdis(struct clk *clk)
 116 {
 117         sysctl_w32(clk->module, clk->bits, SYSCTL_CLKCLR);
 118         sysctl_wait(clk, 0, SYSCTL_CLKS);
 119 }
 120
 121 static void sysctl_reboot(struct clk *clk)
 122 {
 123         unsigned int act;
 124         unsigned int bits;
 125
 126         act = sysctl_r32(clk->module, SYSCTL_ACT);
 127         bits = ~act & clk->bits;
 128         if (bits != 0) {
 129                 sysctl_w32(clk->module, bits, SYSCTL_CLKEN);
 130                 sysctl_w32(clk->module, bits, SYSCTL_ACT);
 131                 sysctl_wait(clk, bits, SYSCTL_ACTS);
 132         }
 133         sysctl_w32(clk->module, act & clk->bits, SYSCTL_RBT);
 134         sysctl_wait(clk, clk->bits, SYSCTL_ACTS);
 135 }
 136
 137 /* enable the ONU core */
 138 static void falcon_gpe_enable(void)
 139 {
 140         unsigned int freq;
 141         unsigned int status;
 142
 143         /* if if the clock is already enabled */
 144         status = sysctl_r32(SYSCTL_SYS1, SYS1_INFRAC);
 145         if (status & (1 << (GPPC_OFFSET + 1)))
 146                 return;
 147
 148         if (status_r32(STATUS_CONFIG) == 0)
 149                 freq = 1; /* use 625MHz on unfused chip */
 150         else
 151                 freq = (status_r32(STATUS_CONFIG) &
 152                         GPEFREQ_MASK) >>
 153                         GPEFREQ_OFFSET;
 154
 155         /* apply new frequency */
 156         sysctl_w32_mask(SYSCTL_SYS1, 7 << (GPPC_OFFSET + 1),
 157                 freq << (GPPC_OFFSET + 2) , SYS1_INFRAC);
 158         udelay(1);
 159
 160         /* enable new frequency */
 161         sysctl_w32_mask(SYSCTL_SYS1, 0, 1 << (GPPC_OFFSET + 1), SYS1_INFRAC);
 162         udelay(1);
 163 }
 164
 165 static inline void clkdev_add_sys(const char *dev, unsigned int module,
 166                                         unsigned int bits)
 167 {
 168         struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 169
 170         clk->cl.dev_id = dev;
 171         clk->cl.con_id = NULL;
 172         clk->cl.clk = clk;
 173         clk->module = module;
 174         clk->bits = bits;
 175         clk->activate = sysctl_activate;
 176         clk->deactivate = sysctl_deactivate;
 177         clk->enable = sysctl_clken;
 178         clk->disable = sysctl_clkdis;
 179         clk->reboot = sysctl_reboot;
 180         clkdev_add(&clk->cl);
 181 }
 182
 183 void __init ltq_soc_init(void)
 184 {
 185         struct device_node *np_status =
 186                 of_find_compatible_node(NULL, NULL, "lantiq,status-falcon");
 187         struct device_node *np_ebu =
 188                 of_find_compatible_node(NULL, NULL, "lantiq,ebu-falcon");
 189         struct device_node *np_sys1 =
 190                 of_find_compatible_node(NULL, NULL, "lantiq,sys1-falcon");
 191         struct device_node *np_syseth =
 192                 of_find_compatible_node(NULL, NULL, "lantiq,syseth-falcon");
 193         struct device_node *np_sysgpe =
 194                 of_find_compatible_node(NULL, NULL, "lantiq,sysgpe-falcon");
 195         struct resource res_status, res_ebu, res_sys[3];
 196         int i;
 197
 198         /* check if all the core register ranges are available */
 199         if (!np_status || !np_ebu || !np_sys1 || !np_syseth || !np_sysgpe)
 200                 panic("Failed to load core nodes from devicetree");
 201
 202         if (of_address_to_resource(np_status, 0, &res_status) ||
 203                         of_address_to_resource(np_ebu, 0, &res_ebu) ||
 204                         of_address_to_resource(np_sys1, 0, &res_sys[0]) ||
 205                         of_address_to_resource(np_syseth, 0, &res_sys[1]) ||
 206                         of_address_to_resource(np_sysgpe, 0, &res_sys[2]))
 207                 panic("Failed to get core resources");
 208
 209         if ((request_mem_region(res_status.start, resource_size(&res_status),
 210                                 res_status.name) < 0) ||
 211                 (request_mem_region(res_ebu.start, resource_size(&res_ebu),
 212                                 res_ebu.name) < 0) ||
 213                 (request_mem_region(res_sys[0].start,
 214                                 resource_size(&res_sys[0]),
 215                                 res_sys[0].name) < 0) ||
 216                 (request_mem_region(res_sys[1].start,
 217                                 resource_size(&res_sys[1]),
 218                                 res_sys[1].name) < 0) ||
 219                 (request_mem_region(res_sys[2].start,
 220                                 resource_size(&res_sys[2]),
 221                                 res_sys[2].name) < 0))
 222                 pr_err("Failed to request core reources");
 223
 224         status_membase = ioremap_nocache(res_status.start,
 225                                         resource_size(&res_status));
 226         ltq_ebu_membase = ioremap_nocache(res_ebu.start,
 227                                         resource_size(&res_ebu));
 228
 229         if (!status_membase || !ltq_ebu_membase)
 230                 panic("Failed to remap core resources");
 231
 232         for (i = 0; i < 3; i++) {
 233                 sysctl_membase[i] = ioremap_nocache(res_sys[i].start,
 234                                                 resource_size(&res_sys[i]));
 235                 if (!sysctl_membase[i])
 236                         panic("Failed to remap sysctrl resources");
 237         }
 238         ltq_sys1_membase = sysctl_membase[0];
 239
 240         falcon_gpe_enable();
 241
 242         /* get our 3 static rates for cpu, fpi and io clocks */
 243         if (ltq_sys1_r32(SYS1_CPU0CC) & CPU0CC_CPUDIV)
 244                 clkdev_add_static(CLOCK_200M, CLOCK_100M, CLOCK_200M, 0);
 245         else
 246                 clkdev_add_static(CLOCK_400M, CLOCK_100M, CLOCK_200M, 0);
 247
 248         /* add our clock domains */
 249         clkdev_add_sys("1d810000.gpio", SYSCTL_SYSETH, ACTS_P0);
 250         clkdev_add_sys("1d810100.gpio", SYSCTL_SYSETH, ACTS_P2);
 251         clkdev_add_sys("1e800100.gpio", SYSCTL_SYS1, ACTS_P1);
 252         clkdev_add_sys("1e800200.gpio", SYSCTL_SYS1, ACTS_P3);
 253         clkdev_add_sys("1e800300.gpio", SYSCTL_SYS1, ACTS_P4);
 254         clkdev_add_sys("1db01000.pad", SYSCTL_SYSETH, ACTS_PADCTRL0);
 255         clkdev_add_sys("1db02000.pad", SYSCTL_SYSETH, ACTS_PADCTRL2);
 256         clkdev_add_sys("1e800400.pad", SYSCTL_SYS1, ACTS_PADCTRL1);
 257         clkdev_add_sys("1e800500.pad", SYSCTL_SYS1, ACTS_PADCTRL3);
 258         clkdev_add_sys("1e800600.pad", SYSCTL_SYS1, ACTS_PADCTRL4);
 259         clkdev_add_sys("1e100C00.serial", SYSCTL_SYS1, ACTS_ASC1_ACT);
 260         clkdev_add_sys("1e200000.i2c", SYSCTL_SYS1, ACTS_I2C_ACT);
 261 }