patch-2.3.99-pre7 linux/arch/ppc/kernel/pmac_nvram.c

• Lines: 320
• Date: Tue May 2 13:05:39 2000
• Orig file: v2.3.99-pre6/linux/arch/ppc/kernel/pmac_nvram.c
• Orig date: Thu Feb 10 17:11:05 2000

diff -u --recursive --new-file v2.3.99-pre6/linux/arch/ppc/kernel/pmac_nvram.c linux/arch/ppc/kernel/pmac_nvram.c
@@ -7,14 +7,18 @@
 #include <linux/nvram.h>
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <asm/init.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/prom.h>
 #include <asm/machdep.h>
+#include <asm/nvram.h>
 #include <linux/adb.h>
 #include <linux/pmu.h>
 
+#undef DEBUG
+
 /*
  * Read and write the non-volatile RAM on PowerMacs and CHRP machines.
  */
@@ -23,9 +27,191 @@
 static volatile unsigned char *nvram_data;
 static int nvram_mult, is_core_99;
 static char* nvram_image;
+static int core99_bank = 0;
+
+extern int pmac_newworld;
  
 #define NVRAM_SIZE		0x2000	/* 8kB of non-volatile RAM */
  
+#define CORE99_SIGNATURE	0x5a
+#define CORE99_ADLER_START	0x14
+
+/* Core99 nvram is a flash */
+#define CORE99_FLASH_STATUS_DONE	0x80
+#define CORE99_FLASH_STATUS_ERR		0x38
+#define CORE99_FLASH_CMD_ERASE_CONFIRM	0xd0
+#define CORE99_FLASH_CMD_ERASE_SETUP	0x20
+#define CORE99_FLASH_CMD_RESET		0xff
+#define CORE99_FLASH_CMD_WRITE_SETUP	0x40
+
+/* CHRP NVRAM header */
+struct chrp_header {
+  u8		signature;
+  u8		cksum;
+  u16		len;
+  char          name[12];
+  u8		data[0];
+};
+
+struct core99_header {
+  struct chrp_header	hdr;
+  u32			adler;
+  u32			generation;
+  u32			reserved[2];
+};
+
+static int nvram_partitions[3];
+
+static u8
+chrp_checksum(struct chrp_header* hdr)
+{
+	u8 *ptr;
+	u16 sum = hdr->signature;
+	for (ptr = (u8 *)&hdr->len; ptr < hdr->data; ptr++)
+		sum += *ptr;
+	while (sum > 0xFF)
+		sum = (sum & 0xFF) + (sum>>8);
+	return sum;
+}
+
+static u32
+core99_calc_adler(u8 *buffer)
+{
+	int cnt;
+	u32 low, high;
+
+   	buffer += CORE99_ADLER_START;
+	low = 1;
+	high = 0;
+	for (cnt=0; cnt<(NVRAM_SIZE-CORE99_ADLER_START); cnt++) {
+		if ((cnt % 5000) == 0) {
+			high  %= 65521UL;
+			high %= 65521UL;
+		}
+		low += buffer[cnt];
+		high += low;
+	}
+	low  %= 65521UL;
+	high %= 65521UL;
+  
+	return (high << 16) | low;
+}
+
+static u32
+core99_check(u8* datas)
+{
+	struct core99_header* hdr99 = (struct core99_header*)datas;
+
+	if (hdr99->hdr.signature != CORE99_SIGNATURE) {
+#ifdef DEBUG
+		printk("Invalid signature\n");
+#endif		
+		return 0;
+	}
+	if (hdr99->hdr.cksum != chrp_checksum(&hdr99->hdr)) {
+#ifdef DEBUG
+		printk("Invalid checksum\n");
+#endif
+		return 0;
+	}
+	if (hdr99->adler != core99_calc_adler(datas)) {
+#ifdef DEBUG
+		printk("Invalid adler\n");
+#endif
+		return 0;
+	}
+	return hdr99->generation;
+}
+
+static int
+core99_erase_bank(int bank)
+{
+	int stat, i;
+	
+	u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE;
+	
+	out_8(base, CORE99_FLASH_CMD_ERASE_SETUP);
+	out_8(base, CORE99_FLASH_CMD_ERASE_CONFIRM);
+	do { stat = in_8(base); }
+	while(!(stat & CORE99_FLASH_STATUS_DONE));
+	out_8(base, CORE99_FLASH_CMD_RESET);
+	if (stat & CORE99_FLASH_STATUS_ERR) {
+		printk("nvram: flash error 0x%02x on erase !\n", stat);
+		return -ENXIO;
+	}
+	for (i=0; i<NVRAM_SIZE; i++)
+		if (base[i] != 0xff) {
+			printk("nvram: flash erase failed !\n");
+			return -ENXIO;
+		}
+	return 0;
+}
+
+static int
+core99_write_bank(int bank, u8* datas)
+{
+	int i, stat = 0;
+	
+	u8* base = (u8 *)nvram_data + core99_bank*NVRAM_SIZE;
+	
+	for (i=0; i<NVRAM_SIZE; i++) {
+		out_8(base+i, CORE99_FLASH_CMD_WRITE_SETUP);
+		out_8(base+i, datas[i]);
+		do { stat = in_8(base); }
+		while(!(stat & CORE99_FLASH_STATUS_DONE));
+		if (stat & CORE99_FLASH_STATUS_ERR)
+			break;
+	}
+	out_8(base, CORE99_FLASH_CMD_RESET);
+	if (stat & CORE99_FLASH_STATUS_ERR) {
+		printk("nvram: flash error 0x%02x on write !\n", stat);
+		return -ENXIO;
+	}
+	for (i=0; i<NVRAM_SIZE; i++)
+		if (base[i] != datas[i]) {
+			printk("nvram: flash write failed !\n");
+			return -ENXIO;
+		}
+	return 0;	
+}
+
+static void
+lookup_partitions(void)
+{
+	u8 buffer[17];
+	int i, offset;
+	struct chrp_header* hdr;
+
+	if (pmac_newworld) {
+		nvram_partitions[pmac_nvram_OF] = -1;
+		nvram_partitions[pmac_nvram_XPRAM] = -1;
+		nvram_partitions[pmac_nvram_NR] = -1;
+		hdr = (struct chrp_header *)buffer;
+	
+		offset = 0;
+		do {
+			for (i=0;i<16;i++)
+				buffer[i] = nvram_read_byte(offset+i);
+			if (!strcmp(hdr->name, "common"))
+				nvram_partitions[pmac_nvram_OF] = offset + 0x10;
+			if (!strcmp(hdr->name, "APL,MacOS75")) {
+				nvram_partitions[pmac_nvram_XPRAM] = offset + 0x10;
+				nvram_partitions[pmac_nvram_NR] = offset + 0x110;
+			}
+			offset += (hdr->len * 0x10);
+		} while(offset < NVRAM_SIZE);
+	} else {
+		nvram_partitions[pmac_nvram_OF] = 0x1800;
+		nvram_partitions[pmac_nvram_XPRAM] = 0x1300;
+		nvram_partitions[pmac_nvram_NR] = 0x1400;
+	}	
+#ifdef DEBUG
+	printk("nvram: OF partition at 0x%x\n", nvram_partitions[pmac_nvram_OF]);
+	printk("nvram: XP partition at 0x%x\n", nvram_partitions[pmac_nvram_XPRAM]);
+	printk("nvram: NR partition at 0x%x\n", nvram_partitions[pmac_nvram_NR]);
+#endif	
+}
+
 __init
 void pmac_nvram_init(void)
 {
@@ -40,17 +226,32 @@
 	}
 	nvram_naddrs = dp->n_addrs;
 	is_core_99 = device_is_compatible(dp, "nvram,flash");
-	if (is_core_99)
-	{
+	if (is_core_99) {
 		int i;
-		if (nvram_naddrs < 1)
+		u32 gen_bank0, gen_bank1;
+		
+		if (nvram_naddrs < 1) {
+			printk(KERN_ERR "nvram: no address\n");
 			return;
-		nvram_image = kmalloc(dp->addrs[0].size, GFP_KERNEL);
-		if (!nvram_image)
+		}
+		nvram_image = kmalloc(NVRAM_SIZE, GFP_KERNEL);
+		if (!nvram_image) {
+			printk(KERN_ERR "nvram: can't allocate image\n");
 			return;
-		nvram_data = ioremap(dp->addrs[0].address, dp->addrs[0].size);
-		for (i=0; i<dp->addrs[0].size; i++)
-			nvram_image[i] = in_8(nvram_data + i);
+		}
+		nvram_data = ioremap(dp->addrs[0].address, NVRAM_SIZE*2);
+#ifdef DEBUG
+		printk("nvram: Checking bank 0...\n");
+#endif
+		gen_bank0 = core99_check((u8 *)nvram_data);
+		gen_bank1 = core99_check((u8 *)nvram_data + NVRAM_SIZE);
+		core99_bank = (gen_bank0 < gen_bank1) ? 1 : 0;
+#ifdef DEBUG
+		printk("nvram: gen0=%d, gen1=%d\n", gen_bank0, gen_bank1);
+		printk("nvram: Active bank is: %d\n", core99_bank);
+#endif
+		for (i=0; i<NVRAM_SIZE; i++)
+			nvram_image[i] = nvram_data[i + core99_bank*NVRAM_SIZE];
 	} else if (_machine == _MACH_chrp && nvram_naddrs == 1) {
 		nvram_data = ioremap(dp->addrs[0].address, dp->addrs[0].size);
 		nvram_mult = 1;
@@ -68,6 +269,33 @@
 	}
 }
 
+void
+pmac_nvram_update(void)
+{
+	struct core99_header* hdr99;
+	
+	if (!is_core_99 || !nvram_data || !nvram_image)
+		return;
+	if (!memcmp(nvram_image, (u8*)nvram_data + core99_bank*NVRAM_SIZE,
+		NVRAM_SIZE))
+		return;
+#ifdef DEBUG
+	printk("Updating nvram...\n");
+#endif
+	hdr99 = (struct core99_header*)nvram_image;
+	hdr99->generation++;
+	hdr99->hdr.signature = CORE99_SIGNATURE;
+	hdr99->hdr.cksum = chrp_checksum(&hdr99->hdr);
+	hdr99->adler = core99_calc_adler(nvram_image);
+	core99_bank = core99_bank ? 0 : 1;
+	if (core99_erase_bank(core99_bank)) {
+		printk("nvram: Error erasing bank %d\n", core99_bank);
+		return;
+	}
+	if (core99_write_bank(core99_bank, nvram_image))
+		printk("nvram: Error writing bank %d\n", core99_bank);
+}
+
 __openfirmware
 unsigned char nvram_read_byte(int addr)
 {
@@ -125,3 +353,33 @@
 	}
 	eieio();
 }
+
+int
+pmac_get_partition(int partition)
+{
+	return nvram_partitions[partition];
+}
+
+u8
+pmac_xpram_read(int xpaddr)
+{
+	int offset = nvram_partitions[pmac_nvram_XPRAM];
+	
+	if (offset < 0)
+		return 0;
+		
+	return nvram_read_byte(xpaddr + offset);
+}
+
+void
+pmac_xpram_write(int xpaddr, u8 data)
+{
+	int offset = nvram_partitions[pmac_nvram_XPRAM];
+	
+	if (offset < 0)
+		return;
+		
+	nvram_write_byte(xpaddr + offset, data);
+}
+
+