ppc4xx: Add EEPROM write protection for PLU405 boards + misc. updates
- add EEPROM write protection for esd PLU405 boards.
- initialize NAND GPIOs
- use correct io accessors
- cleanup
Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c
index f026a7a..57762b5 100644
--- a/board/esd/plu405/plu405.c
+++ b/board/esd/plu405/plu405.c
@@ -109,8 +109,8 @@
int misc_init_r (void)
{
- volatile unsigned char *duart0_mcr = (unsigned char *)((ulong)DUART0_BA + 4);
- volatile unsigned char *duart1_mcr = (unsigned char *)((ulong)DUART1_BA + 4);
+ unsigned char *duart0_mcr = (unsigned char *)((ulong)DUART0_BA + 4);
+ unsigned char *duart1_mcr = (unsigned char *)((ulong)DUART1_BA + 4);
unsigned char *dst;
ulong len = sizeof(fpgadata);
int status;
@@ -184,16 +184,28 @@
/*
* Reset external DUARTs
*/
- out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_DUART_RST);
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) | CFG_DUART_RST); /* set reset to high */
udelay(10); /* wait 10us */
- out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_DUART_RST);
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) & ~CFG_DUART_RST); /* set reset to low */
udelay(1000); /* wait 1ms */
/*
+ * Set NAND-FLASH GPIO signals to default
+ */
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) & ~(CFG_NAND_CLE | CFG_NAND_ALE));
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) | CFG_NAND_CE);
+
+ /*
+ * Setup EEPROM write protection
+ */
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) | CFG_EEPROM_WP);
+ out_be32((void*)GPIO0_TCR, in_be32((void*)GPIO0_TCR) | CFG_EEPROM_WP);
+
+ /*
* Enable interrupts in exar duart mcr[3]
*/
- *duart0_mcr = 0x08;
- *duart1_mcr = 0x08;
+ out_8(duart0_mcr, 0x08);
+ out_8(duart1_mcr, 0x08);
return (0);
}
@@ -259,3 +271,74 @@
lxt971_no_sleep();
#endif
}
+
+
+#if defined(CFG_EEPROM_WREN)
+/* Input: <dev_addr> I2C address of EEPROM device to enable.
+ * <state> -1: deliver current state
+ * 0: disable write
+ * 1: enable write
+ * Returns: -1: wrong device address
+ * 0: dis-/en- able done
+ * 0/1: current state if <state> was -1.
+ */
+int eeprom_write_enable (unsigned dev_addr, int state)
+{
+ if (CFG_I2C_EEPROM_ADDR != dev_addr) {
+ return -1;
+ } else {
+ switch (state) {
+ case 1:
+ /* Enable write access, clear bit GPIO0. */
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) & ~CFG_EEPROM_WP);
+ state = 0;
+ break;
+ case 0:
+ /* Disable write access, set bit GPIO0. */
+ out_be32((void*)GPIO0_OR, in_be32((void*)GPIO0_OR) | CFG_EEPROM_WP);
+ state = 0;
+ break;
+ default:
+ /* Read current status back. */
+ state = (0 == (in_be32((void*)GPIO0_OR) & CFG_EEPROM_WP));
+ break;
+ }
+ }
+ return state;
+}
+
+int do_eep_wren (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ int query = argc == 1;
+ int state = 0;
+
+ if (query) {
+ /* Query write access state. */
+ state = eeprom_write_enable (CFG_I2C_EEPROM_ADDR, -1);
+ if (state < 0) {
+ puts ("Query of write access state failed.\n");
+ } else {
+ printf ("Write access for device 0x%0x is %sabled.\n",
+ CFG_I2C_EEPROM_ADDR, state ? "en" : "dis");
+ state = 0;
+ }
+ } else {
+ if ('0' == argv[1][0]) {
+ /* Disable write access. */
+ state = eeprom_write_enable (CFG_I2C_EEPROM_ADDR, 0);
+ } else {
+ /* Enable write access. */
+ state = eeprom_write_enable (CFG_I2C_EEPROM_ADDR, 1);
+ }
+ if (state < 0) {
+ puts ("Setup of write access state failed.\n");
+ }
+ }
+
+ return state;
+}
+
+U_BOOT_CMD(eepwren, 2, 0, do_eep_wren,
+ "eepwren - Enable / disable / query EEPROM write access\n",
+ NULL);
+#endif /* #if defined(CFG_EEPROM_WREN) */
diff --git a/include/configs/PLU405.h b/include/configs/PLU405.h
index 6b16654..0bd77c0 100644
--- a/include/configs/PLU405.h
+++ b/include/configs/PLU405.h
@@ -288,6 +288,7 @@
#define CFG_I2C_SLAVE 0x7F
#define CFG_I2C_EEPROM_ADDR 0x50 /* EEPROM CAT24WC08 */
+#define CFG_EEPROM_WREN 1
/* CAT24WC08/16... */
#define CFG_I2C_EEPROM_ADDR_LEN 1 /* Bytes of address */
@@ -379,15 +380,16 @@
* GPIO0[28-29] - UART1 data signal input/output
* GPIO0[30-31] - EMAC0 and EMAC1 reject packet inputs
*/
-#define CFG_GPIO0_OSRH 0x40000550
+#define CFG_GPIO0_OSRH 0x00000550
#define CFG_GPIO0_OSRL 0x00000110
#define CFG_GPIO0_ISR1H 0x00000000
#define CFG_GPIO0_ISR1L 0x15555445
#define CFG_GPIO0_TSRH 0x00000000
#define CFG_GPIO0_TSRL 0x00000000
-#define CFG_GPIO0_TCR 0xF7FE0014
+#define CFG_GPIO0_TCR 0x77FE0014
#define CFG_DUART_RST (0x80000000 >> 14)
+#define CFG_EEPROM_WP (0x80000000 >> 0)
/*
* Internal Definitions