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196 lines
4.4 KiB
196 lines
4.4 KiB
19 years ago
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/*`
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* mp1000-seprom.c
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*
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* This file contains the Serial EEPROM code for the MP1000 board
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*
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* Copyright (C) 2005 Comdial Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/hardware.h>
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#include <asm/hardware/clps7111.h>
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#include <asm/arch/mp1000-seprom.h>
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/* If SepromInit() can initialize and checksum the seprom successfully, */
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/* then it will point seprom_data_ptr at the shadow copy. */
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static eeprom_struct seprom_data; /* shadow copy of seprom content */
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eeprom_struct *seprom_data_ptr = 0; /* 0 => not initialized */
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/*
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* Port D Bit 5 is Chip Select for EEPROM
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* Port E Bit 0 is Input, Data out from EEPROM
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* Port E Bit 1 is Output, Data in to EEPROM
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* Port E Bit 2 is Output, CLK to EEPROM
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*/
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static char *port_d_ptr = (char *)(CLPS7111_VIRT_BASE + PDDR);
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static char *port_e_ptr = (char *)(CLPS7111_VIRT_BASE + PEDR);
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#define NO_OF_SHORTS 64 // Device is 64 x 16 bits
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#define ENABLE_RW 0
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#define DISABLE_RW 1
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static inline void toggle_seprom_clock(void)
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{
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*port_e_ptr |= HwPortESepromCLK;
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*port_e_ptr &= ~(HwPortESepromCLK);
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}
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static inline void select_eeprom(void)
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{
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*port_d_ptr |= HwPortDEECS;
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*port_e_ptr &= ~(HwPortESepromCLK);
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}
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static inline void deselect_eeprom(void)
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{
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*port_d_ptr &= ~(HwPortDEECS);
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*port_e_ptr &= ~(HwPortESepromDIn);
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}
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/*
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* GetSepromDataPtr - returns pointer to shadow (RAM) copy of seprom
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* and returns 0 if seprom is not initialized or
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* has a checksum error.
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*/
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eeprom_struct* get_seprom_ptr(void)
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{
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return seprom_data_ptr;
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}
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unsigned char* get_eeprom_mac_address(void)
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{
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return seprom_data_ptr->variant.eprom_struct.mac_Address;
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}
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/*
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* ReadSProm, Physically reads data from the Serial PROM
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*/
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static void read_sprom(short address, int length, eeprom_struct *buffer)
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{
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short data = COMMAND_READ | (address & 0x3F);
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short bit;
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int i;
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select_eeprom();
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// Clock in 9 bits of the command
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for (i = 0, bit = 0x100; i < 9; i++, bit >>= 1) {
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if (data & bit)
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*port_e_ptr |= HwPortESepromDIn;
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else
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*port_e_ptr &= ~(HwPortESepromDIn);
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toggle_seprom_clock();
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}
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//
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// Now read one or more shorts of data from the Seprom
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//
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while (length-- > 0) {
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data = 0;
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// Read 16 bits at a time
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for (i = 0; i < 16; i++) {
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data <<= 1;
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toggle_seprom_clock();
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data |= *port_e_ptr & HwPortESepromDOut;
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}
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buffer->variant.eprom_short_data[address++] = data;
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}
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deselect_eeprom();
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return;
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}
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/*
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* ReadSerialPROM
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*
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* Input: Pointer to array of 64 x 16 Bits
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*
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* Output: if no problem reading data is filled in
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*/
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static void read_serial_prom(eeprom_struct *data)
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{
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read_sprom(0, 64, data);
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}
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//
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// Compute Serial EEPROM checksum
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//
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// Input: Pointer to struct with Eprom data
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//
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// Output: The computed Eprom checksum
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//
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static short compute_seprom_checksum(eeprom_struct *data)
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{
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short checksum = 0;
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int i;
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for (i = 0; i < 126; i++) {
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checksum += (short)data->variant.eprom_byte_data[i];
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}
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return((short)(0x5555 - (checksum & 0xFFFF)));
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}
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//
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// Make sure the data port bits for the SEPROM are correctly initialised
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//
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void __init seprom_init(void)
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{
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short checksum;
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// Init Port D
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*(char *)(CLPS7111_VIRT_BASE + PDDDR) = 0x0;
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*(char *)(CLPS7111_VIRT_BASE + PDDR) = 0x15;
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// Init Port E
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*(int *)(CLPS7111_VIRT_BASE + PEDDR) = 0x06;
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*(int *)(CLPS7111_VIRT_BASE + PEDR) = 0x04;
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//
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// Make sure that EEPROM struct size never exceeds 128 bytes
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//
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if (sizeof(eeprom_struct) > 128) {
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panic("Serial PROM struct size > 128, aborting read\n");
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}
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read_serial_prom(&seprom_data);
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checksum = compute_seprom_checksum(&seprom_data);
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if (checksum != seprom_data.variant.eprom_short_data[63]) {
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panic("Serial EEPROM checksum failed\n");
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}
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seprom_data_ptr = &seprom_data;
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}
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