This patch brings you access to NVRAM chips and serial EEPROMs. Next
posts will show how useful it can be (not mentioning /proc interface to
PROM variables i'm going to implement :))
generated for 2.4 version. i'll generate 2.5 version if anyone is
interested...
diff -Naur linux_2_4/arch/mips/sgi-ip22/Makefile linux_2_4-fucked/arch/mips/sgi-ip22/Makefile
--- linux_2_4/arch/mips/sgi-ip22/Makefile Tue May 6 03:20:28 2003
+++ linux_2_4-fucked/arch/mips/sgi-ip22/Makefile Wed May 7 19:55:29 2003
@@ -14,8 +14,8 @@
export-objs := ip22-ksyms.o
obj-y += ip22-mc.o ip22-hpc.o ip22-int.o ip22-irq.o ip22-berr.o \
- ip22-time.o ip22-rtc.o ip22-reset.o ip22-system.o \
- ip22-setup.o ip22-ksyms.o
+ ip22-time.o ip22-rtc.o ip22-nvram.o ip22-reset.o \
+ ip22-system.o ip22-setup.o ip22-ksyms.o
obj-$(CONFIG_IP22_EISA) += ip22-eisa.o
diff -Naur linux_2_4/arch/mips/sgi-ip22/ip22-ksyms.c linux_2_4-fucked/arch/mips/sgi-ip22/ip22-ksyms.c
--- linux_2_4/arch/mips/sgi-ip22/ip22-ksyms.c Tue May 6 03:20:49 2003
+++ linux_2_4-fucked/arch/mips/sgi-ip22/ip22-ksyms.c Wed May 7 19:55:30 2003
@@ -7,6 +7,7 @@
#include <asm/sgi/mc.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/ioc.h>
+#include <asm/sgi/ip22.h>
EXPORT_SYMBOL(sgimc);
EXPORT_SYMBOL(hpc3c0);
@@ -14,5 +15,7 @@
EXPORT_SYMBOL(sgioc);
extern void (*indy_volume_button)(int);
-
EXPORT_SYMBOL(indy_volume_button);
+
+EXPORT_SYMBOL(ip22_eeprom_read);
+EXPORT_SYMBOL(ip22_nvram_read);
diff -Naur linux_2_4/arch/mips/sgi-ip22/ip22-nvram.c linux_2_4-fucked/arch/mips/sgi-ip22/ip22-nvram.c
--- linux_2_4/arch/mips/sgi-ip22/ip22-nvram.c Thu Jan 1 01:00:00 1970
+++ linux_2_4-fucked/arch/mips/sgi-ip22/ip22-nvram.c Wed May 7 21:31:32 2003
@@ -0,0 +1,114 @@
+/*
+ * ip22-nvram.c: NVRAM and serial EEPROM handling.
+ *
+ * Copyright (C) 2003 Ladislav Michl (ladis@linux-mips.org)
+ */
+
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+
+/* Control opcode for serial eeprom */
+#define EEPROM_READ 0xc000 /* serial memory read */
+#define EEPROM_WEN 0x9800 /* write enable before prog modes */
+#define EEPROM_WRITE 0xa000 /* serial memory write */
+#define EEPROM_WRALL 0x8800 /* write all registers */
+#define EEPROM_WDS 0x8000 /* disable all programming */
+#define EEPROM_PRREAD 0xc000 /* read protect register */
+#define EEPROM_PREN 0x9800 /* enable protect register mode */
+#define EEPROM_PRCLEAR 0xffff /* clear protect register */
+#define EEPROM_PRWRITE 0xa000 /* write protect register */
+#define EEPROM_PRDS 0x8000 /* disable protect register, forever */
+
+#define EEPROM_EPROT 0x01 /* Protect register enable */
+#define EEPROM_CSEL 0x02 /* Chip select */
+#define EEPROM_ECLK 0x04 /* EEPROM clock */
+#define EEPROM_DATO 0x08 /* Data out */
+#define EEPROM_DATI 0x10 /* Data in */
+
+/* We need to use this functions early... */
+#define delay() ({ \
+ int x; \
+ for (x=0; x<100000; x++) __asm__ __volatile__(""); })
+
+#define eeprom_cs_on(ptr) ({ \
+ *ptr &= ~EEPROM_DATO; \
+ *ptr &= ~EEPROM_ECLK; \
+ *ptr &= ~EEPROM_EPROT; \
+ delay(); \
+ *ptr |= EEPROM_CSEL; \
+ *ptr |= EEPROM_ECLK; })
+
+
+#define eeprom_cs_off(ptr) ({ \
+ *ptr &= ~EEPROM_ECLK; \
+ *ptr &= ~EEPROM_CSEL; \
+ *ptr |= EEPROM_EPROT; \
+ *ptr |= EEPROM_ECLK; })
+
+#define BITS_IN_COMMAND 11
+/*
+ * clock in the nvram command and the register number. For the
+ * national semiconductor nv ram chip the op code is 3 bits and
+ * the address is 6/8 bits.
+ */
+static inline void eeprom_cmd(volatile unsigned int *ctrl, unsigned cmd,
+ unsigned reg)
+{
+ unsigned short ser_cmd;
+ int i;
+
+ ser_cmd = cmd | (reg << (16 - BITS_IN_COMMAND));
+ for (i = 0; i < BITS_IN_COMMAND; i++) {
+ if (ser_cmd & (1<<15)) /* if high order bit set */
+ *ctrl |= EEPROM_DATO;
+ else
+ *ctrl &= ~EEPROM_DATO;
+ *ctrl &= ~EEPROM_ECLK;
+ *ctrl |= EEPROM_ECLK;
+ ser_cmd <<= 1;
+ }
+ *ctrl &= ~EEPROM_DATO; /* see data sheet timing diagram */
+}
+
+unsigned short ip22_eeprom_read(volatile unsigned int *ctrl, int reg)
+{
+ unsigned short res = 0;
+ int i;
+
+ *ctrl &= ~EEPROM_EPROT;
+ eeprom_cs_on(ctrl);
+ eeprom_cmd(ctrl, EEPROM_READ, reg);
+
+ /* clock the data ouf of serial mem */
+ for (i = 0; i < 16; i++) {
+ *ctrl &= ~EEPROM_ECLK;
+ delay();
+ *ctrl |= EEPROM_ECLK;
+ delay();
+ res <<= 1;
+ if (*ctrl & EEPROM_DATI)
+ res |= 1;
+ }
+
+ eeprom_cs_off(ctrl);
+
+ return res;
+}
+
+/*
+ * Read specified register from main NVRAM
+ */
+unsigned short ip22_nvram_read(int reg)
+{
+ if (ip22_is_fullhouse())
+ /* IP22 (Indigo2 aka FullHouse) stores env variables into
+ * 93CS56 Microwire Bus EEPROM 2048 Bit (128x16) */
+ return ip22_eeprom_read(&hpc3c0->eeprom, reg);
+ else {
+ unsigned short tmp;
+ /* IP24 (Indy aka Guiness) uses DS1386 8K version */
+ reg = 2 * reg + 64;
+ tmp = hpc3c0->bbram[reg++] & 0xff;
+ return (tmp << 8) | (hpc3c0->bbram[reg] & 0xff);
+ }
+}
diff -Naur linux_2_4/arch/mips/sgi-ip22/ip22-rtc.c linux_2_4-fucked/arch/mips/sgi-ip22/ip22-rtc.c
--- linux_2_4/arch/mips/sgi-ip22/ip22-rtc.c Tue May 6 03:20:49 2003
+++ linux_2_4-fucked/arch/mips/sgi-ip22/ip22-rtc.c Wed May 7 19:55:30 2003
@@ -8,20 +8,16 @@
* Copyright (C) 1998, 2001 by Ralf Baechle
*/
#include <asm/ds1286.h>
-#include <asm/sgi/ip22.h>
+#include <asm/sgi/hpc3.h>
static unsigned char ip22_rtc_read_data(unsigned long addr)
{
- volatile unsigned int *rtcregs = (void *)IP22_CLOCK_REGS;
-
- return rtcregs[addr];
+ return hpc3c0->rtcregs[addr];
}
static void ip22_rtc_write_data(unsigned char data, unsigned long addr)
{
- volatile unsigned int *rtcregs = (void *)IP22_CLOCK_REGS;
-
- rtcregs[addr] = data;
+ hpc3c0->rtcregs[addr] = data;
}
static int ip22_rtc_bcd_mode(void)
diff -Naur linux_2_4/include/asm-mips/sgi/hpc3.h linux_2_4-fucked/include/asm-mips/sgi/hpc3.h
--- linux_2_4/include/asm-mips/sgi/hpc3.h Tue May 6 03:21:22 2003
+++ linux_2_4-fucked/include/asm-mips/sgi/hpc3.h Wed May 7 21:20:17 2003
@@ -206,7 +206,7 @@
#define HPC3_GIOMISC_ERTIME 0x1 /* Enable external timer real time. */
#define HPC3_GIOMISC_DENDIAN 0x2 /* dma descriptor endian, 1=lit 0=big */
- volatile u32 eeprom_data; /* EEPROM data reg. */
+ volatile u32 eeprom; /* EEPROM data reg. */
#define HPC3_EEPROM_EPROT 0x01 /* Protect register enable */
#define HPC3_EEPROM_CSEL 0x02 /* Chip select */
#define HPC3_EEPROM_ECLK 0x04 /* EEPROM clock */
@@ -298,7 +298,10 @@
#define HPC3_PROM_STAT 0x1 /* General purpose status bit in gout */
u32 _unused7[0x1000/4 - 1];
- volatile u32 pbus_promram[16384]; /* 64k of PROM battery backed ram */
+ union {
+ volatile u32 bbram[8192]; /* Battery backed ram */
+ volatile u32 rtcregs[14]; /* Dallas clock registers */
+ };
};
/*
diff -Naur linux_2_4/include/asm-mips/sgi/ip22.h linux_2_4-fucked/include/asm-mips/sgi/ip22.h
--- linux_2_4/include/asm-mips/sgi/ip22.h Tue May 6 03:21:24 2003
+++ linux_2_4-fucked/include/asm-mips/sgi/ip22.h Wed May 7 20:00:31 2003
@@ -71,6 +71,7 @@
#define ip22_is_fullhouse() (sgioc->sysid & SGIOC_SYSID_FULLHOUSE)
-#define IP22_CLOCK_REGS (KSEG1ADDR(0x1fbe0000))
+extern unsigned short ip22_eeprom_read(volatile unsigned int *ctrl, int reg);
+extern unsigned short ip22_nvram_read(int reg);
#endif
diff -Naur linux_2_4/include/asm-mips64/sgi/hpc3.h linux_2_4-fucked/include/asm-mips64/sgi/hpc3.h
--- linux_2_4/include/asm-mips64/sgi/hpc3.h Tue May 6 03:21:28 2003
+++ linux_2_4-fucked/include/asm-mips64/sgi/hpc3.h Wed May 7 21:46:08 2003
@@ -206,7 +206,7 @@
#define HPC3_GIOMISC_ERTIME 0x1 /* Enable external timer real time. */
#define HPC3_GIOMISC_DENDIAN 0x2 /* dma descriptor endian, 1=lit 0=big */
- volatile u32 eeprom_data; /* EEPROM data reg. */
+ volatile u32 eeprom; /* EEPROM data reg. */
#define HPC3_EEPROM_EPROT 0x01 /* Protect register enable */
#define HPC3_EEPROM_CSEL 0x02 /* Chip select */
#define HPC3_EEPROM_ECLK 0x04 /* EEPROM clock */
@@ -298,7 +298,10 @@
#define HPC3_PROM_STAT 0x1 /* General purpose status bit in gout */
u32 _unused7[0x1000/4 - 1];
- volatile u32 pbus_promram[16384]; /* 64k of PROM battery backed ram */
+ union {
+ volatile u32 bbram[8192]; /* Battery backed ram */
+ volatile u32 rtcregs[14]; /* Dallas clock registers */
+ };
};
/*
diff -Naur linux_2_4/include/asm-mips64/sgi/ip22.h linux_2_4-fucked/include/asm-mips64/sgi/ip22.h
--- linux_2_4/include/asm-mips64/sgi/ip22.h Tue May 6 03:21:30 2003
+++ linux_2_4-fucked/include/asm-mips64/sgi/ip22.h Wed May 7 19:55:29 2003
@@ -6,7 +6,7 @@
* ip22.h: Definitions for SGI IP22 machines
*
* Copyright (C) 1996 David S. Miller
- * Copyright (C) 1997, 1999, 2000 Ralf Baechle
+ * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle
*/
#ifndef _SGI_IP22_H
@@ -71,6 +71,7 @@
#define ip22_is_fullhouse() (sgioc->sysid & SGIOC_SYSID_FULLHOUSE)
-#define IP22_CLOCK_REGS (KSEG1ADDR(0x1fbe0000))
+extern unsigned short ip22_eeprom_read(volatile unsigned int *ctrl, int reg);
+extern unsigned short ip22_nvram_read(int reg);
#endif
