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;
+}
+