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,
36 "Defines the type of each interface, each interface separated by commas. The types are 'kcs', 'smic', and 'bt'. For example si_type=kcs,bt will set the first interface to kcs and the second to bt");
37 module_param_hw_array(addrs, ulong, iomem, &num_addrs, 0);
38 MODULE_PARM_DESC(addrs,
39 "Sets the memory address of each interface, the addresses separated by commas. Only use if an interface is in memory. Otherwise, set it to zero or leave it blank.");
40 module_param_hw_array(ports, uint, ioport, &num_ports, 0);
41 MODULE_PARM_DESC(ports,
42 "Sets the port address of each interface, the addresses separated by commas. Only use if an interface is a port. Otherwise, set it to zero or leave it blank.");
43 module_param_hw_array(irqs, int, irq, &num_irqs, 0);
44 MODULE_PARM_DESC(irqs,
45 "Sets the interrupt of each interface, the addresses separated by commas. Only use if an interface has an interrupt. Otherwise, set it to zero or leave it blank.");
46 module_param_hw_array(regspacings, int, other, &num_regspacings, 0);
47 MODULE_PARM_DESC(regspacings,
48 "The number of bytes between the start address and each successive register used by the interface. For instance, if the start address is 0xca2 and the spacing is 2, then the second address is at 0xca4. Defaults to 1.");
49 module_param_hw_array(regsizes, int, other, &num_regsizes, 0);
50 MODULE_PARM_DESC(regsizes,
51 "The size of the specific IPMI register in bytes. This should generally be 1, 2, 4, or 8 for an 8-bit, 16-bit, 32-bit, or 64-bit register. Use this if you the 8-bit IPMI register has to be read from a larger register.");
52 module_param_hw_array(regshifts, int, other, &num_regshifts, 0);
53 MODULE_PARM_DESC(regshifts,
54 "The amount to shift the data read from the. IPMI register, in bits. For instance, if the data is read from a 32-bit word and the IPMI data is in bit 8-15, then the shift would be 8");
55 module_param_hw_array(slave_addrs, int, other, &num_slave_addrs, 0);
56 MODULE_PARM_DESC(slave_addrs,
57 "Set the default IPMB slave address for the controller. Normally this is 0x20, but can be overridden by this parm. This is an array indexed by interface number.");
58
ipmi_hardcode_init_one(const char * si_type_str,unsigned int i,unsigned long addr,enum ipmi_addr_space addr_space)59 static void __init ipmi_hardcode_init_one(const char *si_type_str,
60 unsigned int i,
61 unsigned long addr,
62 enum ipmi_addr_space addr_space)
63 {
64 struct ipmi_plat_data p;
65 int t;
66
67 memset(&p, 0, sizeof(p));
68
69 p.iftype = IPMI_PLAT_IF_SI;
70 if (!si_type_str || !*si_type_str) {
71 p.type = SI_KCS;
72 } else {
73 t = match_string(si_to_str, -1, si_type_str);
74 if (t < 0) {
75 pr_warn("Interface type specified for interface %d, was invalid: %s\n",
76 i, si_type_str);
77 return;
78 }
79 p.type = t;
80 }
81
82 p.regsize = regsizes[i];
83 p.regspacing = regspacings[i];
84 p.slave_addr = slave_addrs[i];
85 p.addr_source = SI_HARDCODED;
86 p.regshift = regshifts[i];
87 p.addr = addr;
88 p.space = addr_space;
89
90 ipmi_platform_add("hardcode-ipmi-si", i, &p);
91 }
92
ipmi_hardcode_init(void)93 void __init ipmi_hardcode_init(void)
94 {
95 unsigned int i;
96 char *str;
97 char *si_type[SI_MAX_PARMS];
98
99 memset(si_type, 0, sizeof(si_type));
100
101 /* Parse out the si_type string into its components. */
102 str = si_type_str;
103 if (*str != '\0') {
104 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
105 si_type[i] = str;
106 str = strchr(str, ',');
107 if (str) {
108 *str = '\0';
109 str++;
110 } else {
111 break;
112 }
113 }
114 }
115
116 for (i = 0; i < SI_MAX_PARMS; i++) {
117 if (i < num_ports && ports[i])
118 ipmi_hardcode_init_one(si_type[i], i, ports[i],
119 IPMI_IO_ADDR_SPACE);
120 if (i < num_addrs && addrs[i])
121 ipmi_hardcode_init_one(si_type[i], i, addrs[i],
122 IPMI_MEM_ADDR_SPACE);
123 }
124 }
125
126
ipmi_si_hardcode_exit(void)127 void ipmi_si_hardcode_exit(void)
128 {
129 ipmi_remove_platform_device_by_name("hardcode-ipmi-si");
130 }
131
132 /*
133 * Returns true of the given address exists as a hardcoded address,
134 * false if not.
135 */
ipmi_si_hardcode_match(int addr_space,unsigned long addr)136 int ipmi_si_hardcode_match(int addr_space, unsigned long addr)
137 {
138 unsigned int i;
139
140 if (addr_space == IPMI_IO_ADDR_SPACE) {
141 for (i = 0; i < num_ports; i++) {
142 if (ports[i] == addr)
143 return 1;
144 }
145 } else {
146 for (i = 0; i < num_addrs; i++) {
147 if (addrs[i] == addr)
148 return 1;
149 }
150 }
151
152 return 0;
153 }
154