arch/mn10300/unit-asb2364/include/unit/smsc911x.h

   1 /* Support for the SMSC911x NIC
   2  *
   3  * Copyright (C) 2006 Matsushita Electric Industrial Co., Ltd.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_UNIT_SMSC911X_H
  12 #define _ASM_UNIT_SMSC911X_H
  13
  14 #include <linux/netdevice.h>
  15 #include <proc/irq.h>
  16 #include <unit/fpga-regs.h>
  17
  18 #define MN10300_USE_EXT_EEPROM
  19
  20
  21 #define SMSC911X_BASE           0xA8000000UL
  22 #define SMSC911X_BASE_END       0xA8000100UL
  23 #define SMSC911X_IRQ            FPGA_LAN_IRQ
  24
  25 /*
  26  * Allow the FPGA to be initialised by the SMSC911x driver
  27  */
  28 #undef SMSC_INITIALIZE
  29 #define SMSC_INITIALIZE()                                       \
  30 do {                                                            \
  31         /* release reset */                                     \
  32         ASB2364_FPGA_REG_RESET_LAN = 0x0001;                    \
  33         SyncExBus();                                            \
  34 } while (0)
  35
  36 #ifdef MN10300_USE_EXT_EEPROM
  37 #include <linux/delay.h>
  38 #include <unit/clock.h>
  39
  40 #define EEPROM_ADDRESS  0xA0
  41 #define MAC_OFFSET      0x0008
  42 #define USE_IIC_CH      0       /* 0 or 1 */
  43 #define IIC_OFFSET      (0x80000 * USE_IIC_CH)
  44 #define IIC_DTRM        __SYSREG(0xd8400000 + IIC_OFFSET, u32)
  45 #define IIC_DREC        __SYSREG(0xd8400004 + IIC_OFFSET, u32)
  46 #define IIC_MYADD       __SYSREG(0xd8400008 + IIC_OFFSET, u32)
  47 #define IIC_CLK         __SYSREG(0xd840000c + IIC_OFFSET, u32)
  48 #define IIC_BRST        __SYSREG(0xd8400010 + IIC_OFFSET, u32)
  49 #define IIC_HOLD        __SYSREG(0xd8400014 + IIC_OFFSET, u32)
  50 #define IIC_BSTS        __SYSREG(0xd8400018 + IIC_OFFSET, u32)
  51 #define IIC_ICR         __SYSREG(0xd4000080 + 4 * USE_IIC_CH, u16)
  52
  53 #define IIC_CLK_PLS     ((unsigned short)(MN10300_IOCLK / 100000 - 1))
  54 #define IIC_CLK_LOW     ((unsigned short)(IIC_CLK_PLS / 2))
  55
  56 #define SYS_IIC_DTRM_Bit_STA    ((unsigned short)0x0400)
  57 #define SYS_IIC_DTRM_Bit_STO    ((unsigned short)0x0200)
  58 #define SYS_IIC_DTRM_Bit_ACK    ((unsigned short)0x0100)
  59 #define SYS_IIC_DTRM_Bit_DATA   ((unsigned short)0x00FF)
  60
  61 static inline void POLL_INT_REQ(volatile u16 *icr)
  62 {
  63         unsigned long flags;
  64         u16 tmp;
  65
  66         while (!(*icr & GxICR_REQUEST))
  67                 ;
  68         flags = arch_local_cli_save();
  69         tmp = *icr;
  70         *icr = (tmp & GxICR_LEVEL) | GxICR_DETECT;
  71         tmp = *icr;
  72         arch_local_irq_restore(flags);
  73 }
  74
  75 /*
  76  * Implement the SMSC911x hook for MAC address retrieval
  77  */
  78 #undef smsc_get_mac
  79 static inline int smsc_get_mac(struct net_device *dev)
  80 {
  81         unsigned char *mac_buf = dev->dev_addr;
  82         int i;
  83         unsigned short value;
  84         unsigned int data;
  85         int mac_length = 6;
  86         int check;
  87         u16 orig_gicr, tmp;
  88         unsigned long flags;
  89
  90         /* save original GnICR and clear GnICR.IE */
  91         flags = arch_local_cli_save();
  92         orig_gicr = IIC_ICR;
  93         IIC_ICR = orig_gicr & GxICR_LEVEL;
  94         tmp = IIC_ICR;
  95         arch_local_irq_restore(flags);
  96
  97         IIC_MYADD = 0x00000008;
  98         IIC_CLK = (IIC_CLK_LOW << 16) + (IIC_CLK_PLS);
  99         /* bus hung recovery */
 100
 101         while (1) {
 102                 check = 0;
 103                 for (i = 0; i < 3; i++) {
 104                         if ((IIC_BSTS & 0x00000003) == 0x00000003)
 105                                 check++;
 106                         udelay(3);
 107                 }
 108
 109                 if (check == 3) {
 110                         IIC_BRST = 0x00000003;
 111                         break;
 112                 } else {
 113                         for (i = 0; i < 3; i++) {
 114                                 IIC_BRST = 0x00000002;
 115                                 udelay(8);
 116                                 IIC_BRST = 0x00000003;
 117                                 udelay(8);
 118                         }
 119                 }
 120         }
 121
 122         IIC_BRST = 0x00000002;
 123         IIC_BRST = 0x00000003;
 124
 125         value   =  SYS_IIC_DTRM_Bit_STA | SYS_IIC_DTRM_Bit_ACK;
 126         value   |= (((unsigned short)EEPROM_ADDRESS & SYS_IIC_DTRM_Bit_DATA) |
 127                     (unsigned short)0x0000);
 128         IIC_DTRM = value;
 129         POLL_INT_REQ(&IIC_ICR);
 130
 131         /** send offset of MAC address in EEPROM **/
 132         IIC_DTRM = (unsigned char)((MAC_OFFSET & 0xFF00) >> 8);
 133         POLL_INT_REQ(&IIC_ICR);
 134
 135         IIC_DTRM = (unsigned char)(MAC_OFFSET & 0x00FF);
 136         POLL_INT_REQ(&IIC_ICR);
 137
 138         udelay(1000);
 139
 140         value   =  SYS_IIC_DTRM_Bit_STA;
 141         value   |= (((unsigned short)EEPROM_ADDRESS & SYS_IIC_DTRM_Bit_DATA) |
 142                     (unsigned short)0x0001);
 143         IIC_DTRM = value;
 144         POLL_INT_REQ(&IIC_ICR);
 145
 146         IIC_DTRM = 0x00000000;
 147         while (mac_length > 0) {
 148                 POLL_INT_REQ(&IIC_ICR);
 149
 150                 data = IIC_DREC;
 151                 mac_length--;
 152                 if (mac_length == 0)
 153                         value = 0x00000300;     /* stop IIC bus */
 154                 else if (mac_length == 1)
 155                         value = 0x00000100;     /* no ack */
 156                 else
 157                         value = 0x00000000;     /* ack */
 158                 IIC_DTRM = value;
 159                 *mac_buf++ = (unsigned char)(data & 0xff);
 160         }
 161
 162         /* restore GnICR.LV and GnICR.IE */
 163         flags = arch_local_cli_save();
 164         IIC_ICR = (orig_gicr & (GxICR_LEVEL | GxICR_ENABLE));
 165         tmp = IIC_ICR;
 166         arch_local_irq_restore(flags);
 167
 168         return 0;
 169 }
 170 #endif /* MN10300_USE_EXT_EEPROM */
 171 #endif /* _ASM_UNIT_SMSC911X_H */