drivers/char/ipmi/ipmi_si_hardcode.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #define pr_fmt(fmt) "ipmi_hardcode: " fmt
   4
   5 #include <linux/moduleparam.h>
   6 #include "ipmi_si.h"
   7
   8 /*
   9  * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
  10  * a default IO port, and 1 ACPI/SPMI address.  That sets SI_MAX_DRIVERS.
  11  */
  12
  13 #define SI_MAX_PARMS 4
  14
  15 static char          *si_type[SI_MAX_PARMS];
  16 #define MAX_SI_TYPE_STR 30
  17 static char          si_type_str[MAX_SI_TYPE_STR];
  18 static unsigned long addrs[SI_MAX_PARMS];
  19 static unsigned int num_addrs;
  20 static unsigned int  ports[SI_MAX_PARMS];
  21 static unsigned int num_ports;
  22 static int           irqs[SI_MAX_PARMS];
  23 static unsigned int num_irqs;
  24 static int           regspacings[SI_MAX_PARMS];
  25 static unsigned int num_regspacings;
  26 static int           regsizes[SI_MAX_PARMS];
  27 static unsigned int num_regsizes;
  28 static int           regshifts[SI_MAX_PARMS];
  29 static unsigned int num_regshifts;
  30 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
  31 static unsigned int num_slave_addrs;
  32
  33 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
  34 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
  35                  " interface separated by commas.  The types are 'kcs',"
  36                  " 'smic', and 'bt'.  For example si_type=kcs,bt will set"
  37                  " the first interface to kcs and the second to bt");
  38 module_param_hw_array(addrs, ulong, iomem, &num_addrs, 0);
  39 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
  40                  " addresses separated by commas.  Only use if an interface"
  41                  " is in memory.  Otherwise, set it to zero or leave"
  42                  " it blank.");
  43 module_param_hw_array(ports, uint, ioport, &num_ports, 0);
  44 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
  45                  " addresses separated by commas.  Only use if an interface"
  46                  " is a port.  Otherwise, set it to zero or leave"
  47                  " it blank.");
  48 module_param_hw_array(irqs, int, irq, &num_irqs, 0);
  49 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
  50                  " addresses separated by commas.  Only use if an interface"
  51                  " has an interrupt.  Otherwise, set it to zero or leave"
  52                  " it blank.");
  53 module_param_hw_array(regspacings, int, other, &num_regspacings, 0);
  54 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
  55                  " and each successive register used by the interface.  For"
  56                  " instance, if the start address is 0xca2 and the spacing"
  57                  " is 2, then the second address is at 0xca4.  Defaults"
  58                  " to 1.");
  59 module_param_hw_array(regsizes, int, other, &num_regsizes, 0);
  60 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
  61                  " This should generally be 1, 2, 4, or 8 for an 8-bit,"
  62                  " 16-bit, 32-bit, or 64-bit register.  Use this if you"
  63                  " the 8-bit IPMI register has to be read from a larger"
  64                  " register.");
  65 module_param_hw_array(regshifts, int, other, &num_regshifts, 0);
  66 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
  67                  " IPMI register, in bits.  For instance, if the data"
  68                  " is read from a 32-bit word and the IPMI data is in"
  69                  " bit 8-15, then the shift would be 8");
  70 module_param_hw_array(slave_addrs, int, other, &num_slave_addrs, 0);
  71 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
  72                  " the controller.  Normally this is 0x20, but can be"
  73                  " overridden by this parm.  This is an array indexed"
  74                  " by interface number.");
  75
  76 int ipmi_si_hardcode_find_bmc(void)
  77 {
  78         int ret = -ENODEV;
  79         int             i;
  80         struct si_sm_io io;
  81         char *str;
  82
  83         /* Parse out the si_type string into its components. */
  84         str = si_type_str;
  85         if (*str != '\0') {
  86                 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
  87                         si_type[i] = str;
  88                         str = strchr(str, ',');
  89                         if (str) {
  90                                 *str = '\0';
  91                                 str++;
  92                         } else {
  93                                 break;
  94                         }
  95                 }
  96         }
  97
  98         memset(&io, 0, sizeof(io));
  99         for (i = 0; i < SI_MAX_PARMS; i++) {
 100                 if (!ports[i] && !addrs[i])
 101                         continue;
 102
 103                 io.addr_source = SI_HARDCODED;
 104                 pr_info("probing via hardcoded address\n");
 105
 106                 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
 107                         io.si_type = SI_KCS;
 108                 } else if (strcmp(si_type[i], "smic") == 0) {
 109                         io.si_type = SI_SMIC;
 110                 } else if (strcmp(si_type[i], "bt") == 0) {
 111                         io.si_type = SI_BT;
 112                 } else {
 113                         pr_warn("Interface type specified for interface %d, was invalid: %s\n",
 114                                 i, si_type[i]);
 115                         continue;
 116                 }
 117
 118                 if (ports[i]) {
 119                         /* An I/O port */
 120                         io.addr_data = ports[i];
 121                         io.addr_type = IPMI_IO_ADDR_SPACE;
 122                 } else if (addrs[i]) {
 123                         /* A memory port */
 124                         io.addr_data = addrs[i];
 125                         io.addr_type = IPMI_MEM_ADDR_SPACE;
 126                 } else {
 127                         pr_warn("Interface type specified for interface %d, but port and address were not set or set to zero\n",
 128                                 i);
 129                         continue;
 130                 }
 131
 132                 io.addr = NULL;
 133                 io.regspacing = regspacings[i];
 134                 if (!io.regspacing)
 135                         io.regspacing = DEFAULT_REGSPACING;
 136                 io.regsize = regsizes[i];
 137                 if (!io.regsize)
 138                         io.regsize = DEFAULT_REGSIZE;
 139                 io.regshift = regshifts[i];
 140                 io.irq = irqs[i];
 141                 if (io.irq)
 142                         io.irq_setup = ipmi_std_irq_setup;
 143                 io.slave_addr = slave_addrs[i];
 144
 145                 ret = ipmi_si_add_smi(&io);
 146         }
 147         return ret;
 148 }