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-rw-r--r--arch/arm/mach-clps711x/mp1000-seprom.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/arch/arm/mach-clps711x/mp1000-seprom.c b/arch/arm/mach-clps711x/mp1000-seprom.c
new file mode 100644
index 000000000000..b22d0bebb851
--- /dev/null
+++ b/arch/arm/mach-clps711x/mp1000-seprom.c
@@ -0,0 +1,195 @@
+/*`
+ * mp1000-seprom.c
+ *
+ * This file contains the Serial EEPROM code for the MP1000 board
+ *
+ * Copyright (C) 2005 Comdial Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/hardware.h>
+#include <asm/hardware/clps7111.h>
+#include <asm/arch/mp1000-seprom.h>
+
+/* If SepromInit() can initialize and checksum the seprom successfully, */
+/* then it will point seprom_data_ptr at the shadow copy. */
+
+static eeprom_struct seprom_data; /* shadow copy of seprom content */
+
+eeprom_struct *seprom_data_ptr = 0; /* 0 => not initialized */
+
+/*
+ * Port D Bit 5 is Chip Select for EEPROM
+ * Port E Bit 0 is Input, Data out from EEPROM
+ * Port E Bit 1 is Output, Data in to EEPROM
+ * Port E Bit 2 is Output, CLK to EEPROM
+ */
+
+static char *port_d_ptr = (char *)(CLPS7111_VIRT_BASE + PDDR);
+static char *port_e_ptr = (char *)(CLPS7111_VIRT_BASE + PEDR);
+
+#define NO_OF_SHORTS 64 // Device is 64 x 16 bits
+#define ENABLE_RW 0
+#define DISABLE_RW 1
+
+static inline void toggle_seprom_clock(void)
+{
+ *port_e_ptr |= HwPortESepromCLK;
+ *port_e_ptr &= ~(HwPortESepromCLK);
+}
+
+static inline void select_eeprom(void)
+{
+ *port_d_ptr |= HwPortDEECS;
+ *port_e_ptr &= ~(HwPortESepromCLK);
+}
+
+static inline void deselect_eeprom(void)
+{
+ *port_d_ptr &= ~(HwPortDEECS);
+ *port_e_ptr &= ~(HwPortESepromDIn);
+}
+
+/*
+ * GetSepromDataPtr - returns pointer to shadow (RAM) copy of seprom
+ * and returns 0 if seprom is not initialized or
+ * has a checksum error.
+ */
+
+eeprom_struct* get_seprom_ptr(void)
+{
+ return seprom_data_ptr;
+}
+
+unsigned char* get_eeprom_mac_address(void)
+{
+ return seprom_data_ptr->variant.eprom_struct.mac_Address;
+}
+
+/*
+ * ReadSProm, Physically reads data from the Serial PROM
+ */
+static void read_sprom(short address, int length, eeprom_struct *buffer)
+{
+ short data = COMMAND_READ | (address & 0x3F);
+ short bit;
+ int i;
+
+ select_eeprom();
+
+ // Clock in 9 bits of the command
+ for (i = 0, bit = 0x100; i < 9; i++, bit >>= 1) {
+ if (data & bit)
+ *port_e_ptr |= HwPortESepromDIn;
+ else
+ *port_e_ptr &= ~(HwPortESepromDIn);
+
+ toggle_seprom_clock();
+ }
+
+ //
+ // Now read one or more shorts of data from the Seprom
+ //
+ while (length-- > 0) {
+ data = 0;
+
+ // Read 16 bits at a time
+ for (i = 0; i < 16; i++) {
+ data <<= 1;
+ toggle_seprom_clock();
+ data |= *port_e_ptr & HwPortESepromDOut;
+
+ }
+
+ buffer->variant.eprom_short_data[address++] = data;
+ }
+
+ deselect_eeprom();
+
+ return;
+}
+
+
+
+/*
+ * ReadSerialPROM
+ *
+ * Input: Pointer to array of 64 x 16 Bits
+ *
+ * Output: if no problem reading data is filled in
+ */
+static void read_serial_prom(eeprom_struct *data)
+{
+ read_sprom(0, 64, data);
+}
+
+
+//
+// Compute Serial EEPROM checksum
+//
+// Input: Pointer to struct with Eprom data
+//
+// Output: The computed Eprom checksum
+//
+static short compute_seprom_checksum(eeprom_struct *data)
+{
+ short checksum = 0;
+ int i;
+
+ for (i = 0; i < 126; i++) {
+ checksum += (short)data->variant.eprom_byte_data[i];
+ }
+
+ return((short)(0x5555 - (checksum & 0xFFFF)));
+}
+
+//
+// Make sure the data port bits for the SEPROM are correctly initialised
+//
+
+void __init seprom_init(void)
+{
+ short checksum;
+
+ // Init Port D
+ *(char *)(CLPS7111_VIRT_BASE + PDDDR) = 0x0;
+ *(char *)(CLPS7111_VIRT_BASE + PDDR) = 0x15;
+
+ // Init Port E
+ *(int *)(CLPS7111_VIRT_BASE + PEDDR) = 0x06;
+ *(int *)(CLPS7111_VIRT_BASE + PEDR) = 0x04;
+
+ //
+ // Make sure that EEPROM struct size never exceeds 128 bytes
+ //
+ if (sizeof(eeprom_struct) > 128) {
+ panic("Serial PROM struct size > 128, aborting read\n");
+ }
+
+ read_serial_prom(&seprom_data);
+
+ checksum = compute_seprom_checksum(&seprom_data);
+
+ if (checksum != seprom_data.variant.eprom_short_data[63]) {
+ panic("Serial EEPROM checksum failed\n");
+ }
+
+ seprom_data_ptr = &seprom_data;
+}
+