arch/mips/txx9/generic/smsc_fdc37m81x.c

   1 /*
   2  * Interface for smsc fdc48m81x Super IO chip
   3  *
   4  * Author: MontaVista Software, Inc. source@mvista.com
   5  *
   6  * 2001-2003 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  *
  11  * Copyright 2004 (c) MontaVista Software, Inc.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/types.h>
  15 #include <asm/io.h>
  16 #include <asm/txx9/smsc_fdc37m81x.h>
  17
  18 /* Common Registers */
  19 #define SMSC_FDC37M81X_CONFIG_INDEX  0x00
  20 #define SMSC_FDC37M81X_CONFIG_DATA   0x01
  21 #define SMSC_FDC37M81X_CONF          0x02
  22 #define SMSC_FDC37M81X_INDEX         0x03
  23 #define SMSC_FDC37M81X_DNUM          0x07
  24 #define SMSC_FDC37M81X_DID           0x20
  25 #define SMSC_FDC37M81X_DREV          0x21
  26 #define SMSC_FDC37M81X_PCNT          0x22
  27 #define SMSC_FDC37M81X_PMGT          0x23
  28 #define SMSC_FDC37M81X_OSC           0x24
  29 #define SMSC_FDC37M81X_CONFPA0       0x26
  30 #define SMSC_FDC37M81X_CONFPA1       0x27
  31 #define SMSC_FDC37M81X_TEST4         0x2B
  32 #define SMSC_FDC37M81X_TEST5         0x2C
  33 #define SMSC_FDC37M81X_TEST1         0x2D
  34 #define SMSC_FDC37M81X_TEST2         0x2E
  35 #define SMSC_FDC37M81X_TEST3         0x2F
  36
  37 /* Logical device numbers */
  38 #define SMSC_FDC37M81X_FDD           0x00
  39 #define SMSC_FDC37M81X_SERIAL1       0x04
  40 #define SMSC_FDC37M81X_SERIAL2       0x05
  41 #define SMSC_FDC37M81X_KBD           0x07
  42
  43 /* Logical device Config Registers */
  44 #define SMSC_FDC37M81X_ACTIVE        0x30
  45 #define SMSC_FDC37M81X_BASEADDR0     0x60
  46 #define SMSC_FDC37M81X_BASEADDR1     0x61
  47 #define SMSC_FDC37M81X_INT           0x70
  48 #define SMSC_FDC37M81X_INT2          0x72
  49 #define SMSC_FDC37M81X_MODE          0xF0
  50
  51 /* Chip Config Values */
  52 #define SMSC_FDC37M81X_CONFIG_ENTER  0x55
  53 #define SMSC_FDC37M81X_CONFIG_EXIT   0xaa
  54 #define SMSC_FDC37M81X_CHIP_ID       0x4d
  55
  56 static unsigned long g_smsc_fdc37m81x_base;
  57
  58 static inline unsigned char smsc_fdc37m81x_rd(unsigned char index)
  59 {
  60         outb(index, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
  61
  62         return inb(g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_DATA);
  63 }
  64
  65 static inline void smsc_dc37m81x_wr(unsigned char index, unsigned char data)
  66 {
  67         outb(index, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
  68         outb(data, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_DATA);
  69 }
  70
  71 void smsc_fdc37m81x_config_beg(void)
  72 {
  73         if (g_smsc_fdc37m81x_base) {
  74                 outb(SMSC_FDC37M81X_CONFIG_ENTER,
  75                      g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
  76         }
  77 }
  78
  79 void smsc_fdc37m81x_config_end(void)
  80 {
  81         if (g_smsc_fdc37m81x_base)
  82                 outb(SMSC_FDC37M81X_CONFIG_EXIT,
  83                      g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
  84 }
  85
  86 u8 smsc_fdc37m81x_config_get(u8 reg)
  87 {
  88         u8 val = 0;
  89
  90         if (g_smsc_fdc37m81x_base)
  91                 val = smsc_fdc37m81x_rd(reg);
  92
  93         return val;
  94 }
  95
  96 void smsc_fdc37m81x_config_set(u8 reg, u8 val)
  97 {
  98         if (g_smsc_fdc37m81x_base)
  99                 smsc_dc37m81x_wr(reg, val);
 100 }
 101
 102 unsigned long __init smsc_fdc37m81x_init(unsigned long port)
 103 {
 104         const int field = sizeof(unsigned long) * 2;
 105         u8 chip_id;
 106
 107         if (g_smsc_fdc37m81x_base)
 108                 pr_warn("%s: stepping on old base=0x%0*lx\n", __func__, field,
 109                         g_smsc_fdc37m81x_base);
 110
 111         g_smsc_fdc37m81x_base = port;
 112
 113         smsc_fdc37m81x_config_beg();
 114
 115         chip_id = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DID);
 116         if (chip_id == SMSC_FDC37M81X_CHIP_ID)
 117                 smsc_fdc37m81x_config_end();
 118         else {
 119                 pr_warn("%s: unknown chip id 0x%02x\n", __func__, chip_id);
 120                 g_smsc_fdc37m81x_base = 0;
 121         }
 122
 123         return g_smsc_fdc37m81x_base;
 124 }
 125
 126 #ifdef DEBUG
 127 static void smsc_fdc37m81x_config_dump_one(const char *key, u8 dev, u8 reg)
 128 {
 129         pr_info("%s: dev=0x%02x reg=0x%02x val=0x%02x\n", key, dev, reg,
 130                 smsc_fdc37m81x_rd(reg));
 131 }
 132
 133 void smsc_fdc37m81x_config_dump(void)
 134 {
 135         u8 orig;
 136         const char *fname = __func__;
 137
 138         smsc_fdc37m81x_config_beg();
 139
 140         orig = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DNUM);
 141
 142         pr_info("%s: common\n", fname);
 143         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
 144                                        SMSC_FDC37M81X_DNUM);
 145         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
 146                                        SMSC_FDC37M81X_DID);
 147         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
 148                                        SMSC_FDC37M81X_DREV);
 149         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
 150                                        SMSC_FDC37M81X_PCNT);
 151         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
 152                                        SMSC_FDC37M81X_PMGT);
 153
 154         pr_info("%s: keyboard\n", fname);
 155         smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, SMSC_FDC37M81X_KBD);
 156         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
 157                                        SMSC_FDC37M81X_ACTIVE);
 158         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
 159                                        SMSC_FDC37M81X_INT);
 160         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
 161                                        SMSC_FDC37M81X_INT2);
 162         smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
 163                                        SMSC_FDC37M81X_LDCR_F0);
 164
 165         smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, orig);
 166
 167         smsc_fdc37m81x_config_end();
 168 }
 169 #endif