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 <linux/platform_device.h>
   7 #include "ipmi_si.h"
   8 #include "ipmi_plat_data.h"
   9
  10 /*
  11  * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
  12  * a default IO port, and 1 ACPI/SPMI address.  That sets SI_MAX_DRIVERS.
  13  */
  14
  15 #define SI_MAX_PARMS 4
  16
  17 #define MAX_SI_TYPE_STR 30
  18 static char          si_type_str[MAX_SI_TYPE_STR] __initdata;
  19 static unsigned long addrs[SI_MAX_PARMS];
  20 static unsigned int num_addrs;
  21 static unsigned int  ports[SI_MAX_PARMS];
  22 static unsigned int num_ports;
  23 static int           irqs[SI_MAX_PARMS] __initdata;
  24 static unsigned int num_irqs __initdata;
  25 static int           regspacings[SI_MAX_PARMS] __initdata;
  26 static unsigned int num_regspacings __initdata;
  27 static int           regsizes[SI_MAX_PARMS] __initdata;
  28 static unsigned int num_regsizes __initdata;
  29 static int           regshifts[SI_MAX_PARMS] __initdata;
  30 static unsigned int num_regshifts __initdata;
  31 static int slave_addrs[SI_MAX_PARMS] __initdata;
  32 static unsigned int num_slave_addrs __initdata;
  33
  34 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
  35 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
  36                  " interface separated by commas.  The types are 'kcs',"
  37                  " 'smic', and 'bt'.  For example si_type=kcs,bt will set"
  38                  " the first interface to kcs and the second to bt");
  39 module_param_hw_array(addrs, ulong, iomem, &num_addrs, 0);
  40 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
  41                  " addresses separated by commas.  Only use if an interface"
  42                  " is in memory.  Otherwise, set it to zero or leave"
  43                  " it blank.");
  44 module_param_hw_array(ports, uint, ioport, &num_ports, 0);
  45 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
  46                  " addresses separated by commas.  Only use if an interface"
  47                  " is a port.  Otherwise, set it to zero or leave"
  48                  " it blank.");
  49 module_param_hw_array(irqs, int, irq, &num_irqs, 0);
  50 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
  51                  " addresses separated by commas.  Only use if an interface"
  52                  " has an interrupt.  Otherwise, set it to zero or leave"
  53                  " it blank.");
  54 module_param_hw_array(regspacings, int, other, &num_regspacings, 0);
  55 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
  56                  " and each successive register used by the interface.  For"
  57                  " instance, if the start address is 0xca2 and the spacing"
  58                  " is 2, then the second address is at 0xca4.  Defaults"
  59                  " to 1.");
  60 module_param_hw_array(regsizes, int, other, &num_regsizes, 0);
  61 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
  62                  " This should generally be 1, 2, 4, or 8 for an 8-bit,"
  63                  " 16-bit, 32-bit, or 64-bit register.  Use this if you"
  64                  " the 8-bit IPMI register has to be read from a larger"
  65                  " register.");
  66 module_param_hw_array(regshifts, int, other, &num_regshifts, 0);
  67 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
  68                  " IPMI register, in bits.  For instance, if the data"
  69                  " is read from a 32-bit word and the IPMI data is in"
  70                  " bit 8-15, then the shift would be 8");
  71 module_param_hw_array(slave_addrs, int, other, &num_slave_addrs, 0);
  72 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
  73                  " the controller.  Normally this is 0x20, but can be"
  74                  " overridden by this parm.  This is an array indexed"
  75                  " by interface number.");
  76
  77 static void __init ipmi_hardcode_init_one(const char *si_type_str,
  78                                           unsigned int i,
  79                                           unsigned long addr,
  80                                           enum ipmi_addr_space addr_space)
  81 {
  82         struct ipmi_plat_data p;
  83
  84         memset(&p, 0, sizeof(p));
  85
  86         p.iftype = IPMI_PLAT_IF_SI;
  87         if (!si_type_str || !*si_type_str || strcmp(si_type_str, "kcs") == 0) {
  88                 p.type = SI_KCS;
  89         } else if (strcmp(si_type_str, "smic") == 0) {
  90                 p.type = SI_SMIC;
  91         } else if (strcmp(si_type_str, "bt") == 0) {
  92                 p.type = SI_BT;
  93         } else if (strcmp(si_type_str, "invalid") == 0) {
  94                 /*
  95                  * Allow a firmware-specified interface to be
  96                  * disabled.
  97                  */
  98                 p.type = SI_TYPE_INVALID;
  99         } else {
 100                 pr_warn("Interface type specified for interface %d, was invalid: %s\n",
 101                         i, si_type_str);
 102                 return;
 103         }
 104
 105         p.regsize = regsizes[i];
 106         p.slave_addr = slave_addrs[i];
 107         p.addr_source = SI_HARDCODED;
 108         p.regshift = regshifts[i];
 109         p.regsize = regsizes[i];
 110         p.addr = addr;
 111         p.space = addr_space;
 112
 113         ipmi_platform_add("hardcode-ipmi-si", i, &p);
 114 }
 115
 116 void __init ipmi_hardcode_init(void)
 117 {
 118         unsigned int i;
 119         char *str;
 120         char *si_type[SI_MAX_PARMS];
 121
 122         memset(si_type, 0, sizeof(si_type));
 123
 124         /* Parse out the si_type string into its components. */
 125         str = si_type_str;
 126         if (*str != '\0') {
 127                 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
 128                         si_type[i] = str;
 129                         str = strchr(str, ',');
 130                         if (str) {
 131                                 *str = '\0';
 132                                 str++;
 133                         } else {
 134                                 break;
 135                         }
 136                 }
 137         }
 138
 139         for (i = 0; i < SI_MAX_PARMS; i++) {
 140                 if (i < num_ports && ports[i])
 141                         ipmi_hardcode_init_one(si_type[i], i, ports[i],
 142                                                IPMI_IO_ADDR_SPACE);
 143                 if (i < num_addrs && addrs[i])
 144                         ipmi_hardcode_init_one(si_type[i], i, addrs[i],
 145                                                IPMI_MEM_ADDR_SPACE);
 146         }
 147 }
 148
 149
 150 void ipmi_si_hardcode_exit(void)
 151 {
 152         ipmi_remove_platform_device_by_name("hardcode-ipmi-si");
 153 }
 154
 155 /*
 156  * Returns true of the given address exists as a hardcoded address,
 157  * false if not.
 158  */
 159 int ipmi_si_hardcode_match(int addr_space, unsigned long addr)
 160 {
 161         unsigned int i;
 162
 163         if (addr_space == IPMI_IO_ADDR_SPACE) {
 164                 for (i = 0; i < num_ports; i++) {
 165                         if (ports[i] == addr)
 166                                 return 1;
 167                 }
 168         } else {
 169                 for (i = 0; i < num_addrs; i++) {
 170                         if (addrs[i] == addr)
 171                                 return 1;
 172                 }
 173         }
 174
 175         return 0;
 176 }