The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mediatek/mtk_soc.c

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    1 /*-
    2  * Copyright (c) 2016 Stanislav Galabov.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/12/sys/mips/mediatek/mtk_soc.c 317873 2017-05-06 06:20:34Z adrian $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/rman.h>
   36 
   37 #include <machine/fdt.h>
   38 
   39 #include <dev/ofw/openfirm.h>
   40 #include <dev/ofw/ofw_bus.h>
   41 #include <dev/ofw/ofw_bus_subr.h>
   42 
   43 #include <dev/fdt/fdt_common.h>
   44 #include <dev/fdt/fdt_clock.h>
   45 
   46 #include <mips/mediatek/fdt_reset.h>
   47 #include <mips/mediatek/mtk_sysctl.h>
   48 #include <mips/mediatek/mtk_soc.h>
   49 
   50 static uint32_t mtk_soc_socid = MTK_SOC_UNKNOWN;
   51 static uint32_t mtk_soc_uartclk = 0;
   52 static uint32_t mtk_soc_cpuclk = MTK_CPU_CLK_880MHZ;
   53 static uint32_t mtk_soc_timerclk = MTK_CPU_CLK_880MHZ / 2;
   54 
   55 static const struct ofw_compat_data compat_data[] = {
   56         { "ralink,rt2880-soc",          MTK_SOC_RT2880 },
   57         { "ralink,rt3050-soc",          MTK_SOC_RT3050 },
   58         { "ralink,rt3052-soc",          MTK_SOC_RT3052 },
   59         { "ralink,rt3350-soc",          MTK_SOC_RT3350 },
   60         { "ralink,rt3352-soc",          MTK_SOC_RT3352 },
   61         { "ralink,rt3662-soc",          MTK_SOC_RT3662 },
   62         { "ralink,rt3883-soc",          MTK_SOC_RT3883 },
   63         { "ralink,rt5350-soc",          MTK_SOC_RT5350 },
   64         { "ralink,mtk7620a-soc",        MTK_SOC_MT7620A },
   65         { "ralink,mt7620a-soc",         MTK_SOC_MT7620A },
   66         { "ralink,mtk7620n-soc",        MTK_SOC_MT7620N },
   67         { "ralink,mt7620n-soc",         MTK_SOC_MT7620N },
   68         { "mediatek,mtk7621-soc",       MTK_SOC_MT7621 },
   69         { "mediatek,mt7621-soc",        MTK_SOC_MT7621 },
   70         { "ralink,mt7621-soc",          MTK_SOC_MT7621 },
   71         { "ralink,mtk7621-soc",         MTK_SOC_MT7621 },
   72         { "ralink,mtk7628an-soc",       MTK_SOC_MT7628 },
   73         { "mediatek,mt7628an-soc",      MTK_SOC_MT7628 },
   74         { "ralink,mtk7688-soc",         MTK_SOC_MT7688 },
   75 
   76         /* Sentinel */
   77         { NULL,                         MTK_SOC_UNKNOWN },
   78 };
   79 
   80 static uint32_t
   81 mtk_detect_cpuclk_rt2880(bus_space_tag_t bst, bus_space_handle_t bsh)
   82 {
   83         uint32_t val;
   84 
   85         val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
   86         val >>= RT2880_CPU_CLKSEL_OFF;
   87         val &= RT2880_CPU_CLKSEL_MSK;
   88 
   89         switch (val) {
   90         case 0:
   91                 return (MTK_CPU_CLK_250MHZ);
   92         case 1:
   93                 return (MTK_CPU_CLK_266MHZ);
   94         case 2:
   95                 return (MTK_CPU_CLK_280MHZ);
   96         case 3:
   97                 return (MTK_CPU_CLK_300MHZ);
   98         }
   99 
  100         /* Never reached */
  101         return (0);
  102 }
  103 
  104 static uint32_t
  105 mtk_detect_cpuclk_rt305x(bus_space_tag_t bst, bus_space_handle_t bsh)
  106 {
  107         uint32_t val;
  108 
  109         val = bus_space_read_4(bst, bsh, SYSCTL_CHIPID0_3);
  110         if (val == RT3350_CHIPID0_3)
  111                 return (MTK_CPU_CLK_320MHZ);
  112 
  113         val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  114         val >>= RT305X_CPU_CLKSEL_OFF;
  115         val &= RT305X_CPU_CLKSEL_MSK;
  116 
  117         return ((val == 0) ? MTK_CPU_CLK_320MHZ : MTK_CPU_CLK_384MHZ);
  118 }
  119 
  120 static uint32_t
  121 mtk_detect_cpuclk_rt3352(bus_space_tag_t bst, bus_space_handle_t bsh)
  122 {
  123         uint32_t val;
  124 
  125         val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  126         val >>= RT3352_CPU_CLKSEL_OFF;
  127         val &= RT3352_CPU_CLKSEL_MSK;
  128 
  129         if (val)
  130                 return (MTK_CPU_CLK_400MHZ);
  131 
  132         return (MTK_CPU_CLK_384MHZ);
  133 }
  134 
  135 static uint32_t
  136 mtk_detect_cpuclk_rt3883(bus_space_tag_t bst, bus_space_handle_t bsh)
  137 {
  138         uint32_t val;
  139 
  140         val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  141         val >>= RT3883_CPU_CLKSEL_OFF;
  142         val &= RT3883_CPU_CLKSEL_MSK;
  143 
  144         switch (val) {
  145         case 0:
  146                 return (MTK_CPU_CLK_250MHZ);
  147         case 1:
  148                 return (MTK_CPU_CLK_384MHZ);
  149         case 2:
  150                 return (MTK_CPU_CLK_480MHZ);
  151         case 3:
  152                 return (MTK_CPU_CLK_500MHZ);
  153         }
  154 
  155         /* Never reached */
  156         return (0);
  157 }
  158 
  159 static uint32_t
  160 mtk_detect_cpuclk_rt5350(bus_space_tag_t bst, bus_space_handle_t bsh)
  161 {
  162         uint32_t val1, val2;
  163 
  164         val1 = val2 = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  165 
  166         val1 >>= RT5350_CPU_CLKSEL_OFF1;
  167         val2 >>= RT5350_CPU_CLKSEL_OFF2;
  168         val1 &= RT5350_CPU_CLKSEL_MSK;
  169         val2 &= RT5350_CPU_CLKSEL_MSK;
  170         val1 |= (val2 << 1);
  171 
  172         switch (val1) {
  173         case 0:
  174                 return (MTK_CPU_CLK_360MHZ);
  175         case 1:
  176                 /* Reserved value, but we return UNKNOWN */
  177                 return (MTK_CPU_CLK_UNKNOWN);
  178         case 2:
  179                 return (MTK_CPU_CLK_320MHZ);
  180         case 3:
  181                 return (MTK_CPU_CLK_300MHZ);
  182         }
  183 
  184         /* Never reached */
  185         return (0);
  186 }
  187 
  188 static uint32_t
  189 mtk_detect_cpuclk_mt7620(bus_space_tag_t bst, bus_space_handle_t bsh)
  190 {
  191         uint32_t val, mul, div, res;
  192 
  193         val = bus_space_read_4(bst, bsh, SYSCTL_MT7620_CPLL_CFG1);
  194         if (val & MT7620_CPU_CLK_AUX0)
  195                 return (MTK_CPU_CLK_480MHZ);
  196 
  197         val = bus_space_read_4(bst, bsh, SYSCTL_MT7620_CPLL_CFG0);
  198         if (!(val & MT7620_CPLL_SW_CFG))
  199                 return (MTK_CPU_CLK_600MHZ);
  200 
  201         mul = MT7620_PLL_MULT_RATIO_BASE + ((val >> MT7620_PLL_MULT_RATIO_OFF) &
  202             MT7620_PLL_MULT_RATIO_MSK);
  203         div = (val >> MT7620_PLL_DIV_RATIO_OFF) & MT7620_PLL_DIV_RATIO_MSK;
  204 
  205         if (div != MT7620_PLL_DIV_RATIO_MSK)
  206                 div += MT7620_PLL_DIV_RATIO_BASE;
  207         else
  208                 div = MT7620_PLL_DIV_RATIO_MAX;
  209 
  210         res = (MT7620_XTAL_40 * mul) / div;
  211 
  212         return (MTK_MHZ(res));
  213 }
  214 
  215 static uint32_t
  216 mtk_detect_cpuclk_mt7621(bus_space_tag_t bst, bus_space_handle_t bsh)
  217 {
  218         uint32_t val, div, res;
  219 
  220         val = bus_space_read_4(bst, bsh, SYSCTL_CLKCFG0);
  221         if (val & MT7621_USES_MEMDIV) {
  222                 div = bus_space_read_4(bst, bsh, MTK_MT7621_CLKDIV_REG);
  223                 div >>= MT7621_MEMDIV_OFF;
  224                 div &= MT7621_MEMDIV_MSK;
  225                 div += MT7621_MEMDIV_BASE;
  226 
  227                 val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  228                 val >>= MT7621_CLKSEL_OFF;
  229                 val &= MT7621_CLKSEL_MSK;
  230 
  231                 if (val >= MT7621_CLKSEL_25MHZ_VAL)
  232                         res = div * MT7621_CLKSEL_25MHZ;
  233                 else if (val >= MT7621_CLKSEL_20MHZ_VAL)
  234                         res = div * MT7621_CLKSEL_20MHZ;
  235                 else
  236                         res = div * 0; /* XXX: not sure about this */
  237         } else {
  238                 val = bus_space_read_4(bst, bsh, SYSCTL_CUR_CLK_STS);
  239                 div = (val >> MT7621_CLK_STS_DIV_OFF) & MT7621_CLK_STS_MSK;
  240                 val &= MT7621_CLK_STS_MSK;
  241 
  242                 res = (MT7621_CLK_STS_BASE * val) / div;
  243         }
  244 
  245         return (MTK_MHZ(res));
  246 }
  247 
  248 static uint32_t
  249 mtk_detect_cpuclk_mt7628(bus_space_tag_t bst, bus_space_handle_t bsh)
  250 {
  251         uint32_t val;
  252 
  253         val = bus_space_read_4(bst, bsh, SYSCTL_SYSCFG);
  254         val >>= MT7628_CPU_CLKSEL_OFF;
  255         val &= MT7628_CPU_CLKSEL_MSK;
  256 
  257         if (val)
  258                 return (MTK_CPU_CLK_580MHZ);
  259 
  260         return (MTK_CPU_CLK_575MHZ);
  261 }
  262 
  263 void
  264 mtk_soc_try_early_detect(void)
  265 {
  266         bus_space_tag_t bst;
  267         bus_space_handle_t bsh;
  268         uint32_t base;
  269         phandle_t node;
  270         int i;
  271 
  272         if ((node = OF_finddevice("/")) == -1)
  273                 return;
  274 
  275         for (i = 0; compat_data[i].ocd_str != NULL; i++) {
  276                 if (ofw_bus_node_is_compatible(node, compat_data[i].ocd_str)) {
  277                         mtk_soc_socid = compat_data[i].ocd_data;
  278                         break;
  279                 }
  280         }
  281 
  282         if (mtk_soc_socid == MTK_SOC_UNKNOWN) {
  283                 /* We don't know the SoC, so we don't know how to get clocks */
  284                 return;
  285         }
  286 
  287         bst = fdtbus_bs_tag;
  288         if (mtk_soc_socid == MTK_SOC_RT2880)
  289                 base = MTK_RT2880_BASE;
  290         else if (mtk_soc_socid == MTK_SOC_MT7621)
  291                 base = MTK_MT7621_BASE;
  292         else
  293                 base = MTK_DEFAULT_BASE;
  294 
  295         if (bus_space_map(bst, base, MTK_DEFAULT_SIZE, 0, &bsh))
  296                 return;
  297 
  298         /* First, figure out the CPU clock */
  299         switch (mtk_soc_socid) {
  300         case MTK_SOC_RT2880:
  301                 mtk_soc_cpuclk = mtk_detect_cpuclk_rt2880(bst, bsh);
  302                 break;
  303         case MTK_SOC_RT3050:  /* fallthrough */
  304         case MTK_SOC_RT3052:
  305         case MTK_SOC_RT3350:
  306                 mtk_soc_cpuclk = mtk_detect_cpuclk_rt305x(bst, bsh);
  307                 break;
  308         case MTK_SOC_RT3352:
  309                 mtk_soc_cpuclk = mtk_detect_cpuclk_rt3352(bst, bsh);
  310                 break;
  311         case MTK_SOC_RT3662:  /* fallthrough */
  312         case MTK_SOC_RT3883:
  313                 mtk_soc_cpuclk = mtk_detect_cpuclk_rt3883(bst, bsh);
  314                 break;
  315         case MTK_SOC_RT5350:
  316                 mtk_soc_cpuclk = mtk_detect_cpuclk_rt5350(bst, bsh);
  317                 break;
  318         case MTK_SOC_MT7620A: /* fallthrough */
  319         case MTK_SOC_MT7620N:
  320                 mtk_soc_cpuclk = mtk_detect_cpuclk_mt7620(bst, bsh);
  321                 break;
  322         case MTK_SOC_MT7621:
  323                 mtk_soc_cpuclk = mtk_detect_cpuclk_mt7621(bst, bsh);
  324                 break;
  325         case MTK_SOC_MT7628:  /* fallthrough */
  326         case MTK_SOC_MT7688:
  327                 mtk_soc_cpuclk = mtk_detect_cpuclk_mt7628(bst, bsh);
  328                 break;
  329         default:
  330                 /* We don't know the SoC, so we can't find the CPU clock */
  331                 break;
  332         }
  333 
  334         /* Now figure out the timer clock */
  335         if (mtk_soc_socid == MTK_SOC_MT7621) {
  336 #ifdef notyet
  337                 /* 
  338                  * We use the GIC timer for timing source and its clock freq is
  339                  * the same as the CPU's clock freq
  340                  */
  341                 mtk_soc_timerclk = mtk_soc_cpuclk;
  342 #else
  343                 /*
  344                  * When GIC timer and MIPS timer are ready to co-exist and
  345                  * GIC timer is actually implemented, we need to switch to it.
  346                  * Until then we use a fake GIC timer, which is actually a
  347                  * normal MIPS ticker, so the timer clock is half the CPU clock
  348                  */
  349                 mtk_soc_timerclk = mtk_soc_cpuclk / 2;
  350 #endif
  351         } else {
  352                 /*
  353                  * We use the MIPS ticker for the rest for now, so
  354                  * the CPU clock is divided by 2
  355                  */
  356                 mtk_soc_timerclk = mtk_soc_cpuclk / 2;
  357         }
  358 
  359         switch (mtk_soc_socid) {
  360         case MTK_SOC_RT2880:
  361                 mtk_soc_uartclk = mtk_soc_cpuclk / MTK_UARTDIV_2;
  362                 break;
  363         case MTK_SOC_RT3350:  /* fallthrough */
  364         case MTK_SOC_RT3050:  /* fallthrough */
  365         case MTK_SOC_RT3052:
  366                 /* UART clock is CPU clock / 3 */
  367                 mtk_soc_uartclk = mtk_soc_cpuclk / MTK_UARTDIV_3;
  368                 break;
  369         case MTK_SOC_RT3352:  /* fallthrough */
  370         case MTK_SOC_RT3662:  /* fallthrough */
  371         case MTK_SOC_RT3883:  /* fallthrough */
  372         case MTK_SOC_RT5350:  /* fallthrough */
  373         case MTK_SOC_MT7620A: /* fallthrough */
  374         case MTK_SOC_MT7620N: /* fallthrough */
  375         case MTK_SOC_MT7628:  /* fallthrough */
  376         case MTK_SOC_MT7688:
  377                 /* UART clock is always 40MHz */
  378                 mtk_soc_uartclk = MTK_UART_CLK_40MHZ;
  379                 break;
  380         case MTK_SOC_MT7621:
  381                 /* UART clock is always 50MHz */
  382                 mtk_soc_uartclk = MTK_UART_CLK_50MHZ;
  383                 break;
  384         default:
  385                 /* We don't know the SoC, so we don't know the UART clock */
  386                 break;
  387         }
  388 
  389         bus_space_unmap(bst, bsh, MTK_DEFAULT_SIZE);
  390 }
  391 
  392 uint32_t
  393 mtk_soc_get_uartclk(void)
  394 {
  395 
  396         return mtk_soc_uartclk;
  397 }
  398 
  399 uint32_t
  400 mtk_soc_get_cpuclk(void)
  401 {
  402 
  403         return mtk_soc_cpuclk;
  404 }
  405 
  406 uint32_t
  407 mtk_soc_get_timerclk(void)
  408 {
  409 
  410         return mtk_soc_timerclk;
  411 }
  412 
  413 uint32_t
  414 mtk_soc_get_socid(void)
  415 {
  416 
  417         return mtk_soc_socid;
  418 }
  419 
  420 /*
  421  * The following are generic reset and clock functions
  422  */
  423 
  424 /* Default reset time is 100ms */
  425 #define DEFAULT_RESET_TIME      100000
  426 
  427 int
  428 mtk_soc_reset_device(device_t dev)
  429 {
  430         int res;
  431 
  432         res = fdt_reset_assert_all(dev);
  433         if (res == 0) {
  434                 DELAY(DEFAULT_RESET_TIME);
  435                 res = fdt_reset_deassert_all(dev);
  436                 if (res == 0)
  437                         DELAY(DEFAULT_RESET_TIME);
  438         }
  439 
  440         return (res);
  441 }
  442 
  443 int
  444 mtk_soc_stop_clock(device_t dev)
  445 {
  446 
  447         return (fdt_clock_disable_all(dev));
  448 }
  449 
  450 int
  451 mtk_soc_start_clock(device_t dev)
  452 {
  453 
  454         return (fdt_clock_enable_all(dev));
  455 }
  456 
  457 int
  458 mtk_soc_assert_reset(device_t dev)
  459 {
  460 
  461         return (fdt_reset_assert_all(dev));
  462 }
  463 
  464 int
  465 mtk_soc_deassert_reset(device_t dev)
  466 {
  467 
  468         return (fdt_reset_deassert_all(dev));
  469 }
  470 
  471 void
  472 mtk_soc_reset(void)
  473 {
  474 
  475         mtk_sysctl_clr_set(SYSCTL_RSTCTRL, 0, 1);
  476         mtk_sysctl_clr_set(SYSCTL_RSTCTRL, 1, 0);
  477 }

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