IDE stream driver

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@870 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/stream/ide_stream.c

@@ -0,0 +1,119 @@
+#include <console/console.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stream/read_bytes.h>
+#include <delay.h>
+#include <string.h>
+
+/* read a sector or a partial sector */
+extern int ide_read_sector(int drive, void * buffer, unsigned int block, int byte_offset, 
+	int n_bytes);
+extern int ide_init(void);
+
+static unsigned long offset;
+int stream_init(void)
+{
+	int i,res;
+
+        printk_debug ("Trying polled ide\n");
+        printk_debug ("Waiting for ide disks to spin up\n");
+        printk_notice ("This is a hard coded delay and longer than necessary.\n");
+	for (i = 0; i < 2; i++) {
+		printk_notice (".");
+		delay(1);
+	}
+	printk_info ("\n");
+
+#ifdef ONE_TRACK
+	offset = (ONE_TRACK*512);
+#elif defined(IDE_OFFSET)
+	offset = IDE_OFFSET;
+#else
+	offset = 0x7e00;
+#endif
+	res = ide_init();
+	delay(1);
+	return res;
+}
+
+void stream_fini(void)
+{
+	return;
+}
+
+#ifdef IDE_SWAB
+/* from string/swab.c */
+void
+swab (const char *from, char *to, int n)
+{
+	n &= ~1;
+	while (n > 1)
+	{
+		const char b0 = from[--n], b1 = from[--n];
+		to[n] = b0;
+		to[n + 1] = b1;
+	}
+}
+#endif
+
+static unsigned char buffer[512];
+static unsigned int block_num = 0;
+static unsigned int first_fill = 1;
+#ifndef IDE_BOOT_DRIVE
+#define IDE_BOOT_DRIVE 0
+#endif
+static byte_offset_t ide_read(void *vdest, byte_offset_t offset, byte_offset_t count)
+{
+	byte_offset_t bytes = 0;
+	unsigned char *dest = vdest;
+
+	//printk_debug("ide_read count = %x\n", count);
+	while (bytes < count) {
+		unsigned int byte_offset, len;
+
+		/* The block is not cached in memory or frist time called */
+		if (block_num != offset / 512 || first_fill) {
+			block_num  = offset / 512;
+			printk_notice (".");
+			ide_read_sector(IDE_BOOT_DRIVE, buffer, block_num,
+					0, 512);
+			first_fill = 0;
+		}
+
+		byte_offset = offset % 512;
+		len = 512 - byte_offset;
+		if (len > (count - bytes)) {
+			len = (count - bytes);
+		}
+
+#ifdef IDE_SWAB
+		swab(buffer + byte_offset, dest, len);
+#else
+		memcpy(dest, buffer + byte_offset, len);
+#endif
+
+		offset += len;
+		bytes += len;
+		dest += len;
+
+	}
+	return bytes;
+}
+
+byte_offset_t stream_read(void *vdest, byte_offset_t count)
+{
+	byte_offset_t len;
+
+	len = ide_read(vdest, offset, count);
+	if (len > 0) {
+		offset += len;
+	}
+
+	return len;
+}
+
+byte_offset_t stream_skip(byte_offset_t count)
+{
+	offset += count;
+	return count;
+}