uart_cpu_sparc64.c

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    1 /*-
    2  * Copyright (c) 2003, 2004 Marcel Moolenaar
    3  * Copyright (c) 2004 - 2006 Marius Strobl <marius@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 
   34 #include <machine/bus.h>
   35 #include <machine/bus_private.h>
   36 
   37 #include <dev/ofw/openfirm.h>
   38 #include <machine/ofw_machdep.h>
   39 
   40 #include <dev/uart/uart.h>
   41 #include <dev/uart/uart_cpu.h>
   42 
   43 bus_space_tag_t uart_bus_space_io;
   44 bus_space_tag_t uart_bus_space_mem;
   45 
   46 static struct bus_space_tag bst_store[3];
   47 
   48 /*
   49  * Determine which channel of a SCC a device referenced by a full device
   50  * path or as an alias is (in the latter case we try to look up the device
   51  * path via the /aliases node).
   52  * Only the device paths of devices which are used for TTYs really allow
   53  * to do this as they look like these (taken from /aliases nodes):
   54  * ttya:  '/central/fhc/zs@0,902000:a'
   55  * ttyc:  '/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a'
   56  * Additionally, for device paths of SCCs which are connected to a RSC
   57  * (Remote System Control) device we can hardcode the appropriate channel.
   58  * Such device paths look like these:
   59  * rsc:   '/pci@1f,4000/ebus@1/se@14,200000:ssp'
   60  * ttyc:  '/pci@1f,4000/ebus@1/se@14,200000:ssp'
   61  */
   62 static int
   63 uart_cpu_channel(char *dev)
   64 {
   65         char alias[64];
   66         phandle_t aliases;
   67         int len;
   68         const char *p;
   69 
   70         strcpy(alias, dev);
   71         if ((aliases = OF_finddevice("/aliases")) != -1)
   72                 (void)OF_getprop(aliases, dev, alias, sizeof(alias));
   73         len = strlen(alias);
   74         if ((p = rindex(alias, ':')) == NULL)
   75                 return (0);
   76         p++;
   77         if (p - alias == len - 1 && (*p == 'a' || *p == 'b'))
   78                 return (*p - 'a' + 1);
   79         if (strcmp(p, "ssp") == 0)
   80                 return (1);
   81         return (0);
   82 }
   83 
   84 int
   85 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   86 {
   87 
   88         return ((b1->bsh == b2->bsh) ? 1 : 0);
   89 }
   90 
   91 /*
   92  * Get the package handle of the UART that is selected as the console, if
   93  * the console is an UART of course. Note that we enforce that both input
   94  * and output are selected.
   95  * Note that the currently active console (i.e. /chosen/stdout and
   96  * /chosen/stdin) may not be the same as the device selected in the
   97  * environment (ie /options/output-device and /options/input-device) because
   98  * keyboard and screen were selected but the keyboard was unplugged or the
   99  * user has changed the environment. In the latter case I would assume that
  100  * the user expects that FreeBSD uses the new console setting.
  101  * For weirder configurations, use ofw_console(4).
  102  */
  103 static phandle_t
  104 uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz)
  105 {
  106         char buf[sizeof("serial")];
  107         ihandle_t inst;
  108         phandle_t chosen, input, output;
  109 
  110         if (OF_getprop(options, "input-device", dev, devsz) == -1)
  111                 return (-1);
  112         input = OF_finddevice(dev);
  113         if (OF_getprop(options, "output-device", dev, devsz) == -1)
  114                 return (-1);
  115         output = OF_finddevice(dev);
  116         if (input == -1 || output == -1 ||
  117             OF_getproplen(input, "keyboard") >= 0) {
  118                 if ((chosen = OF_finddevice("/chosen")) == -1)
  119                         return (-1);
  120                 if (OF_getprop(chosen, "stdin", &inst, sizeof(inst)) == -1)
  121                         return (-1);
  122                 if ((input = OF_instance_to_package(inst)) == -1)
  123                         return (-1);
  124                 if (OF_getprop(chosen, "stdout", &inst, sizeof(inst)) == -1)
  125                         return (-1);
  126                 if ((output = OF_instance_to_package(inst)) == -1)
  127                         return (-1);
  128                 snprintf(dev, devsz, "ttya");
  129         }
  130         if (input != output)
  131                 return (-1);
  132         if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
  133                 return (-1);
  134         if (strcmp(buf, "serial") != 0)
  135                 return (-1);
  136         /* For a Serengeti console device point to the bootbus controller. */
  137         if (OF_getprop(input, "name", buf, sizeof(buf)) > 0 &&
  138             !strcmp(buf, "sgcn")) {
  139                 if ((chosen = OF_finddevice("/chosen")) == -1)
  140                         return (-1);
  141                 if (OF_getprop(chosen, "iosram", &input, sizeof(input)) == -1)
  142                         return (-1);
  143         }
  144         return (input);
  145 }
  146 
  147 /*
  148  * Get the package handle of the UART that's selected as the debug port.
  149  * Since there's no place for this in the OF, we use the kernel environment
  150  * variable "hw.uart.dbgport". Note however that the variable is not a
  151  * list of attributes. It's single device name or alias, as known by
  152  * the OF.
  153  */
  154 static phandle_t
  155 uart_cpu_getdev_dbgport(char *dev, size_t devsz)
  156 {
  157         char buf[sizeof("serial")];
  158         phandle_t input;
  159 
  160         if (!getenv_string("hw.uart.dbgport", dev, devsz))
  161                 return (-1);
  162         if ((input = OF_finddevice(dev)) == -1)
  163                 return (-1);
  164         if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
  165                 return (-1);
  166         if (strcmp(buf, "serial") != 0)
  167                 return (-1);
  168         return (input);
  169 }
  170 
  171 /*
  172  * Get the package handle of the UART that is selected as the keyboard port,
  173  * if it's actually used to connect the keyboard according to the OF. I.e.
  174  * this will return the UART used to connect the keyboard regardless whether
  175  * it's stdin or not, however not in case the user or the OF gave preference
  176  * to e.g. a PS/2 keyboard by setting /aliases/keyboard accordingly.
  177  */
  178 static phandle_t
  179 uart_cpu_getdev_keyboard(char *dev, size_t devsz)
  180 {
  181         char buf[sizeof("serial")];
  182         phandle_t input;
  183 
  184         if ((input = OF_finddevice("keyboard")) == -1)
  185                 return (-1);
  186         if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
  187                 return (-1);
  188         if (strcmp(buf, "serial") != 0)
  189                 return (-1);
  190         if (OF_getprop(input, "name", dev, devsz) == -1)
  191                 return (-1);
  192         /*
  193          * So far this also matched PS/2 keyboard nodes so make sure it's
  194          * one of the SCCs/UARTs known to be used to connect keyboards.
  195          */
  196         if (strcmp(dev, "su") && strcmp(dev, "su_pnp") && strcmp(dev, "zs"))
  197                 return (-1);
  198         return (input);
  199 }
  200 
  201 int
  202 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
  203 {
  204         char buf[32], compat[32], dev[64];
  205         struct uart_class *class;
  206         phandle_t input, options;
  207         bus_addr_t addr;
  208         int baud, bits, error, range, space, stop;
  209         char flag, par;
  210 
  211         if ((options = OF_finddevice("/options")) == -1)
  212                 return (ENXIO);
  213         switch (devtype) {
  214         case UART_DEV_CONSOLE:
  215                 input = uart_cpu_getdev_console(options, dev, sizeof(dev));
  216                 break;
  217         case UART_DEV_DBGPORT:
  218                 input = uart_cpu_getdev_dbgport(dev, sizeof(dev));
  219                 break;
  220         case UART_DEV_KEYBOARD:
  221                 input = uart_cpu_getdev_keyboard(dev, sizeof(dev));
  222                 break;
  223         default:
  224                 input = -1;
  225                 break;
  226         }
  227         if (input == -1)
  228                 return (ENXIO);
  229         error = OF_decode_addr(input, 0, &space, &addr);
  230         if (error)
  231                 return (error);
  232 
  233         /* Get the device class. */
  234         if (OF_getprop(input, "name", buf, sizeof(buf)) == -1)
  235                 return (ENXIO);
  236         if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1)
  237                 compat[0] = '\0';
  238         di->bas.regshft = 0;
  239         di->bas.rclk = 0;
  240         class = NULL;
  241         if (!strcmp(buf, "se") || !strcmp(buf, "FJSV,se") ||
  242             !strcmp(compat, "sab82532")) {
  243                 class = &uart_sab82532_class;
  244                 /* SAB82532 are only known to be used for TTYs. */
  245                 if ((di->bas.chan = uart_cpu_channel(dev)) == 0)
  246                         return (ENXIO);
  247                 addr += uart_getrange(class) * (di->bas.chan - 1);
  248         } else if (!strcmp(buf, "zs")) {
  249                 class = &uart_z8530_class;
  250                 if ((di->bas.chan = uart_cpu_channel(dev)) == 0) {
  251                         /*
  252                          * There's no way to determine from OF which
  253                          * channel has the keyboard. Should always be
  254                          * on channel 1 however.
  255                          */
  256                         if (devtype == UART_DEV_KEYBOARD)
  257                                 di->bas.chan = 1;
  258                         else
  259                                 return (ENXIO);
  260                 }
  261                 di->bas.regshft = 1;
  262                 range = uart_getrange(class) << di->bas.regshft;
  263                 addr += range - range * (di->bas.chan - 1);
  264         } else if (!strcmp(buf, "lom-console") || !strcmp(buf, "su") ||
  265             !strcmp(buf, "su_pnp") || !strcmp(compat, "rsc-console") ||
  266             !strcmp(compat, "su") || !strcmp(compat, "su16550") ||
  267             !strcmp(compat, "su16552")) {
  268                 class = &uart_ns8250_class;
  269                 di->bas.chan = 0;
  270         } else if (!strcmp(compat, "sgsbbc")) {
  271                 class = &uart_sbbc_class;
  272                 di->bas.chan = 0;
  273         }
  274         if (class == NULL)
  275                 return (ENXIO);
  276 
  277         /* Fill in the device info. */
  278         di->ops = uart_getops(class);
  279         di->bas.bst = &bst_store[devtype];
  280         di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst);
  281 
  282         /* Get the line settings. */
  283         if (devtype == UART_DEV_KEYBOARD)
  284                 di->baudrate = 1200;
  285         else if (!strcmp(compat, "rsc-console"))
  286                 di->baudrate = 115200;
  287         else
  288                 di->baudrate = 9600;
  289         di->databits = 8;
  290         di->stopbits = 1;
  291         di->parity = UART_PARITY_NONE;
  292         snprintf(buf, sizeof(buf), "%s-mode", dev);
  293         if (OF_getprop(options, buf, buf, sizeof(buf)) == -1 &&
  294             OF_getprop(input, "ssp-console-modes", buf, sizeof(buf)) == -1)
  295                 return (0);
  296         if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag)
  297             != 5)
  298                 return (0);
  299         di->baudrate = baud;
  300         di->databits = bits;
  301         di->stopbits = stop;
  302         di->parity = (par == 'n') ? UART_PARITY_NONE :
  303             (par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN;
  304         return (0);
  305 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_cpu_sparc64.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_sparc64.c
