arch/mips/lantiq/xway/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) 2011-2012 John Crispin <blogic@openwrt.org>
   7  */
   8
   9 #include <linux/ioport.h>
  10 #include <linux/export.h>
  11 #include <linux/clkdev.h>
  12 #include <linux/of.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/of_address.h>
  15
  16 #include <lantiq_soc.h>
  17
  18 #include "../clk.h"
  19 #include "../prom.h"
  20
  21 /* clock control register */
  22 #define CGU_IFCCR       0x0018
  23 #define CGU_IFCCR_VR9   0x0024
  24 /* system clock register */
  25 #define CGU_SYS         0x0010
  26 /* pci control register */
  27 #define CGU_PCICR       0x0034
  28 #define CGU_PCICR_VR9   0x0038
  29 /* ephy configuration register */
  30 #define CGU_EPHY        0x10
  31 /* power control register */
  32 #define PMU_PWDCR       0x1C
  33 /* power status register */
  34 #define PMU_PWDSR       0x20
  35 /* power control register */
  36 #define PMU_PWDCR1      0x24
  37 /* power status register */
  38 #define PMU_PWDSR1      0x28
  39 /* power control register */
  40 #define PWDCR(x) ((x) ? (PMU_PWDCR1) : (PMU_PWDCR))
  41 /* power status register */
  42 #define PWDSR(x) ((x) ? (PMU_PWDSR1) : (PMU_PWDSR))
  43
  44 /* clock gates that we can en/disable */
  45 #define PMU_USB0_P      BIT(0)
  46 #define PMU_PCI         BIT(4)
  47 #define PMU_DMA         BIT(5)
  48 #define PMU_USB0        BIT(6)
  49 #define PMU_ASC0        BIT(7)
  50 #define PMU_EPHY        BIT(7)  /* ase */
  51 #define PMU_SPI         BIT(8)
  52 #define PMU_DFE         BIT(9)
  53 #define PMU_EBU         BIT(10)
  54 #define PMU_STP         BIT(11)
  55 #define PMU_GPT         BIT(12)
  56 #define PMU_AHBS        BIT(13) /* vr9 */
  57 #define PMU_FPI         BIT(14)
  58 #define PMU_AHBM        BIT(15)
  59 #define PMU_ASC1        BIT(17)
  60 #define PMU_PPE_QSB     BIT(18)
  61 #define PMU_PPE_SLL01   BIT(19)
  62 #define PMU_PPE_TC      BIT(21)
  63 #define PMU_PPE_EMA     BIT(22)
  64 #define PMU_PPE_DPLUM   BIT(23)
  65 #define PMU_PPE_DPLUS   BIT(24)
  66 #define PMU_USB1_P      BIT(26)
  67 #define PMU_USB1        BIT(27)
  68 #define PMU_SWITCH      BIT(28)
  69 #define PMU_PPE_TOP     BIT(29)
  70 #define PMU_GPHY        BIT(30)
  71 #define PMU_PCIE_CLK    BIT(31)
  72
  73 #define PMU1_PCIE_PHY   BIT(0)
  74 #define PMU1_PCIE_CTL   BIT(1)
  75 #define PMU1_PCIE_PDI   BIT(4)
  76 #define PMU1_PCIE_MSI   BIT(5)
  77
  78 #define pmu_w32(x, y)   ltq_w32((x), pmu_membase + (y))
  79 #define pmu_r32(x)      ltq_r32(pmu_membase + (x))
  80
  81 static void __iomem *pmu_membase;
  82 void __iomem *ltq_cgu_membase;
  83 void __iomem *ltq_ebu_membase;
  84
  85 static u32 ifccr = CGU_IFCCR;
  86 static u32 pcicr = CGU_PCICR;
  87
  88 /* legacy function kept alive to ease clkdev transition */
  89 void ltq_pmu_enable(unsigned int module)
  90 {
  91         int err = 1000000;
  92
  93         pmu_w32(pmu_r32(PMU_PWDCR) & ~module, PMU_PWDCR);
  94         do {} while (--err && (pmu_r32(PMU_PWDSR) & module));
  95
  96         if (!err)
  97                 panic("activating PMU module failed!");
  98 }
  99 EXPORT_SYMBOL(ltq_pmu_enable);
 100
 101 /* legacy function kept alive to ease clkdev transition */
 102 void ltq_pmu_disable(unsigned int module)
 103 {
 104         pmu_w32(pmu_r32(PMU_PWDCR) | module, PMU_PWDCR);
 105 }
 106 EXPORT_SYMBOL(ltq_pmu_disable);
 107
 108 /* enable a hw clock */
 109 static int cgu_enable(struct clk *clk)
 110 {
 111         ltq_cgu_w32(ltq_cgu_r32(ifccr) | clk->bits, ifccr);
 112         return 0;
 113 }
 114
 115 /* disable a hw clock */
 116 static void cgu_disable(struct clk *clk)
 117 {
 118         ltq_cgu_w32(ltq_cgu_r32(ifccr) & ~clk->bits, ifccr);
 119 }
 120
 121 /* enable a clock gate */
 122 static int pmu_enable(struct clk *clk)
 123 {
 124         int retry = 1000000;
 125
 126         pmu_w32(pmu_r32(PWDCR(clk->module)) & ~clk->bits,
 127                 PWDCR(clk->module));
 128         do {} while (--retry && (pmu_r32(PWDSR(clk->module)) & clk->bits));
 129
 130         if (!retry)
 131                 panic("activating PMU module failed!\n");
 132
 133         return 0;
 134 }
 135
 136 /* disable a clock gate */
 137 static void pmu_disable(struct clk *clk)
 138 {
 139         pmu_w32(pmu_r32(PWDCR(clk->module)) | clk->bits,
 140                 PWDCR(clk->module));
 141 }
 142
 143 /* the pci enable helper */
 144 static int pci_enable(struct clk *clk)
 145 {
 146         unsigned int val = ltq_cgu_r32(ifccr);
 147         /* set bus clock speed */
 148         if (of_machine_is_compatible("lantiq,ar9") ||
 149                         of_machine_is_compatible("lantiq,vr9")) {
 150                 val &= ~0x1f00000;
 151                 if (clk->rate == CLOCK_33M)
 152                         val |= 0xe00000;
 153                 else
 154                         val |= 0x700000; /* 62.5M */
 155         } else {
 156                 val &= ~0xf00000;
 157                 if (clk->rate == CLOCK_33M)
 158                         val |= 0x800000;
 159                 else
 160                         val |= 0x400000; /* 62.5M */
 161         }
 162         ltq_cgu_w32(val, ifccr);
 163         pmu_enable(clk);
 164         return 0;
 165 }
 166
 167 /* enable the external clock as a source */
 168 static int pci_ext_enable(struct clk *clk)
 169 {
 170         ltq_cgu_w32(ltq_cgu_r32(ifccr) & ~(1 << 16), ifccr);
 171         ltq_cgu_w32((1 << 30), pcicr);
 172         return 0;
 173 }
 174
 175 /* disable the external clock as a source */
 176 static void pci_ext_disable(struct clk *clk)
 177 {
 178         ltq_cgu_w32(ltq_cgu_r32(ifccr) | (1 << 16), ifccr);
 179         ltq_cgu_w32((1 << 31) | (1 << 30), pcicr);
 180 }
 181
 182 /* enable a clockout source */
 183 static int clkout_enable(struct clk *clk)
 184 {
 185         int i;
 186
 187         /* get the correct rate */
 188         for (i = 0; i < 4; i++) {
 189                 if (clk->rates[i] == clk->rate) {
 190                         int shift = 14 - (2 * clk->module);
 191                         int enable = 7 - clk->module;
 192                         unsigned int val = ltq_cgu_r32(ifccr);
 193
 194                         val &= ~(3 << shift);
 195                         val |= i << shift;
 196                         val |= enable;
 197                         ltq_cgu_w32(val, ifccr);
 198                         return 0;
 199                 }
 200         }
 201         return -1;
 202 }
 203
 204 /* manage the clock gates via PMU */
 205 static void clkdev_add_pmu(const char *dev, const char *con,
 206                                         unsigned int module, unsigned int bits)
 207 {
 208         struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 209
 210         clk->cl.dev_id = dev;
 211         clk->cl.con_id = con;
 212         clk->cl.clk = clk;
 213         clk->enable = pmu_enable;
 214         clk->disable = pmu_disable;
 215         clk->module = module;
 216         clk->bits = bits;
 217         clkdev_add(&clk->cl);
 218 }
 219
 220 /* manage the clock generator */
 221 static void clkdev_add_cgu(const char *dev, const char *con,
 222                                         unsigned int bits)
 223 {
 224         struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 225
 226         clk->cl.dev_id = dev;
 227         clk->cl.con_id = con;
 228         clk->cl.clk = clk;
 229         clk->enable = cgu_enable;
 230         clk->disable = cgu_disable;
 231         clk->bits = bits;
 232         clkdev_add(&clk->cl);
 233 }
 234
 235 /* pci needs its own enable function as the setup is a bit more complex */
 236 static unsigned long valid_pci_rates[] = {CLOCK_33M, CLOCK_62_5M, 0};
 237
 238 static void clkdev_add_pci(void)
 239 {
 240         struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 241         struct clk *clk_ext = kzalloc(sizeof(struct clk), GFP_KERNEL);
 242
 243         /* main pci clock */
 244         clk->cl.dev_id = "17000000.pci";
 245         clk->cl.con_id = NULL;
 246         clk->cl.clk = clk;
 247         clk->rate = CLOCK_33M;
 248         clk->rates = valid_pci_rates;
 249         clk->enable = pci_enable;
 250         clk->disable = pmu_disable;
 251         clk->module = 0;
 252         clk->bits = PMU_PCI;
 253         clkdev_add(&clk->cl);
 254
 255         /* use internal/external bus clock */
 256         clk_ext->cl.dev_id = "17000000.pci";
 257         clk_ext->cl.con_id = "external";
 258         clk_ext->cl.clk = clk_ext;
 259         clk_ext->enable = pci_ext_enable;
 260         clk_ext->disable = pci_ext_disable;
 261         clkdev_add(&clk_ext->cl);
 262 }
 263
 264 /* xway socs can generate clocks on gpio pins */
 265 static unsigned long valid_clkout_rates[4][5] = {
 266         {CLOCK_32_768K, CLOCK_1_536M, CLOCK_2_5M, CLOCK_12M, 0},
 267         {CLOCK_40M, CLOCK_12M, CLOCK_24M, CLOCK_48M, 0},
 268         {CLOCK_25M, CLOCK_40M, CLOCK_30M, CLOCK_60M, 0},
 269         {CLOCK_12M, CLOCK_50M, CLOCK_32_768K, CLOCK_25M, 0},
 270 };
 271
 272 static void clkdev_add_clkout(void)
 273 {
 274         int i;
 275
 276         for (i = 0; i < 4; i++) {
 277                 struct clk *clk;
 278                 char *name;
 279
 280                 name = kzalloc(sizeof("clkout0"), GFP_KERNEL);
 281                 sprintf(name, "clkout%d", i);
 282
 283                 clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 284                 clk->cl.dev_id = "1f103000.cgu";
 285                 clk->cl.con_id = name;
 286                 clk->cl.clk = clk;
 287                 clk->rate = 0;
 288                 clk->rates = valid_clkout_rates[i];
 289                 clk->enable = clkout_enable;
 290                 clk->module = i;
 291                 clkdev_add(&clk->cl);
 292         }
 293 }
 294
 295 /* bring up all register ranges that we need for basic system control */
 296 void __init ltq_soc_init(void)
 297 {
 298         struct resource res_pmu, res_cgu, res_ebu;
 299         struct device_node *np_pmu =
 300                         of_find_compatible_node(NULL, NULL, "lantiq,pmu-xway");
 301         struct device_node *np_cgu =
 302                         of_find_compatible_node(NULL, NULL, "lantiq,cgu-xway");
 303         struct device_node *np_ebu =
 304                         of_find_compatible_node(NULL, NULL, "lantiq,ebu-xway");
 305
 306         /* check if all the core register ranges are available */
 307         if (!np_pmu || !np_cgu || !np_ebu)
 308                 panic("Failed to load core nodes from devicetree");
 309
 310         if (of_address_to_resource(np_pmu, 0, &res_pmu) ||
 311                         of_address_to_resource(np_cgu, 0, &res_cgu) ||
 312                         of_address_to_resource(np_ebu, 0, &res_ebu))
 313                 panic("Failed to get core resources");
 314
 315         if ((request_mem_region(res_pmu.start, resource_size(&res_pmu),
 316                                 res_pmu.name) < 0) ||
 317                 (request_mem_region(res_cgu.start, resource_size(&res_cgu),
 318                                 res_cgu.name) < 0) ||
 319                 (request_mem_region(res_ebu.start, resource_size(&res_ebu),
 320                                 res_ebu.name) < 0))
 321                 pr_err("Failed to request core reources");
 322
 323         pmu_membase = ioremap_nocache(res_pmu.start, resource_size(&res_pmu));
 324         ltq_cgu_membase = ioremap_nocache(res_cgu.start,
 325                                                 resource_size(&res_cgu));
 326         ltq_ebu_membase = ioremap_nocache(res_ebu.start,
 327                                                 resource_size(&res_ebu));
 328         if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase)
 329                 panic("Failed to remap core resources");
 330
 331         /* make sure to unprotect the memory region where flash is located */
 332         ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
 333
 334         /* add our generic xway clocks */
 335         clkdev_add_pmu("10000000.fpi", NULL, 0, PMU_FPI);
 336         clkdev_add_pmu("1e100400.serial", NULL, 0, PMU_ASC0);
 337         clkdev_add_pmu("1e100a00.gptu", NULL, 0, PMU_GPT);
 338         clkdev_add_pmu("1e100bb0.stp", NULL, 0, PMU_STP);
 339         clkdev_add_pmu("1e104100.dma", NULL, 0, PMU_DMA);
 340         clkdev_add_pmu("1e100800.spi", NULL, 0, PMU_SPI);
 341         clkdev_add_pmu("1e105300.ebu", NULL, 0, PMU_EBU);
 342         clkdev_add_clkout();
 343
 344         /* add the soc dependent clocks */
 345         if (of_machine_is_compatible("lantiq,vr9")) {
 346                 ifccr = CGU_IFCCR_VR9;
 347                 pcicr = CGU_PCICR_VR9;
 348         } else {
 349                 clkdev_add_pmu("1e180000.etop", NULL, 0, PMU_PPE);
 350         }
 351
 352         if (!of_machine_is_compatible("lantiq,ase")) {
 353                 clkdev_add_pmu("1e100c00.serial", NULL, 0, PMU_ASC1);
 354                 clkdev_add_pci();
 355         }
 356
 357         if (of_machine_is_compatible("lantiq,ase")) {
 358                 if (ltq_cgu_r32(CGU_SYS) & (1 << 5))
 359                         clkdev_add_static(CLOCK_266M, CLOCK_133M,
 360                                                 CLOCK_133M, CLOCK_266M);
 361                 else
 362                         clkdev_add_static(CLOCK_133M, CLOCK_133M,
 363                                                 CLOCK_133M, CLOCK_133M);
 364                 clkdev_add_cgu("1e180000.etop", "ephycgu", CGU_EPHY),
 365                 clkdev_add_pmu("1e180000.etop", "ephy", 0, PMU_EPHY);
 366         } else if (of_machine_is_compatible("lantiq,vr9")) {
 367                 clkdev_add_static(ltq_vr9_cpu_hz(), ltq_vr9_fpi_hz(),
 368                                 ltq_vr9_fpi_hz(), ltq_vr9_pp32_hz());
 369                 clkdev_add_pmu("1d900000.pcie", "phy", 1, PMU1_PCIE_PHY);
 370                 clkdev_add_pmu("1d900000.pcie", "bus", 0, PMU_PCIE_CLK);
 371                 clkdev_add_pmu("1d900000.pcie", "msi", 1, PMU1_PCIE_MSI);
 372                 clkdev_add_pmu("1d900000.pcie", "pdi", 1, PMU1_PCIE_PDI);
 373                 clkdev_add_pmu("1d900000.pcie", "ctl", 1, PMU1_PCIE_CTL);
 374                 clkdev_add_pmu("1d900000.pcie", "ahb", 0, PMU_AHBM | PMU_AHBS);
 375                 clkdev_add_pmu("1e108000.eth", NULL, 0,
 376                                 PMU_SWITCH | PMU_PPE_DPLUS | PMU_PPE_DPLUM |
 377                                 PMU_PPE_EMA | PMU_PPE_TC | PMU_PPE_SLL01 |
 378                                 PMU_PPE_QSB | PMU_PPE_TOP);
 379         } else if (of_machine_is_compatible("lantiq,ar9")) {
 380                 clkdev_add_static(ltq_ar9_cpu_hz(), ltq_ar9_fpi_hz(),
 381                                 ltq_ar9_fpi_hz(), CLOCK_250M);
 382                 clkdev_add_pmu("1e180000.etop", "switch", 0, PMU_SWITCH);
 383         } else {
 384                 clkdev_add_static(ltq_danube_cpu_hz(), ltq_danube_fpi_hz(),
 385                                 ltq_danube_fpi_hz(), ltq_danube_pp32_hz());
 386         }
 387 }