patch-1.3.61 linux/drivers/block/ali14xx.c

• Lines: 223
• Date: Fri Feb 9 07:31:22 1996
• Orig file: v1.3.60/linux/drivers/block/ali14xx.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.60/linux/drivers/block/ali14xx.c linux/drivers/block/ali14xx.c
@@ -0,0 +1,222 @@
+/*
+ *  linux/drivers/block/ali14xx.c       Version 0.01  Feb 06, 1996
+ *
+ *  Copyright (C) 1996  Linus Torvalds & author (see below)
+ */
+
+/*
+ * ALI M14xx chipset EIDE controller
+ *
+ * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml
+ * Derek's notes follow:
+ *
+ * I think the code should be pretty understandable,
+ * but I'll be happy to (try to) answer questions.
+ *
+ * The critical part is in the setupDrive function.  The initRegisters
+ * function doesn't seem to be necessary, but the DOS driver does it, so
+ * I threw it in.
+ *
+ * I've only tested this on my system, which only has one disk.  I posted
+ * it to comp.sys.linux.hardware, so maybe some other people will try it
+ * out.
+ *
+ * Derek Noonburg  (derekn@ece.cmu.edu)
+ * 95-sep-26
+ */
+
+#undef REALLY_SLOW_IO           /* most systems can safely undef this */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <asm/io.h>
+#include "ide.h"
+
+#define ALI_14xx_BUS_SPEED	40	/* PCI / VLB bus speed */
+
+/* port addresses for auto-detection */
+#define ALI_NUM_PORTS 4
+static int ports[ALI_NUM_PORTS] = {0x074, 0x0f4, 0x034, 0x0e4};
+
+/* register initialization data */
+typedef struct { byte reg, data; } RegInitializer;
+
+static RegInitializer initData[] = {
+	{0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
+	{0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
+	{0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
+	{0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
+	{0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
+	{0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
+	{0x35, 0x03}, {0x00, 0x00}
+};
+
+/* default timing parameters for each PIO mode */
+static struct { int time1, time2; } timeTab[4] = {
+	{600, 165},	/* PIO 0 */
+	{383, 125},	/* PIO 1 */
+	{240, 100},	/* PIO 2 */
+	{180,  80}	/* PIO 3 */
+};
+
+/* timing parameter registers for each drive */
+static struct { byte reg1, reg2, reg3, reg4; } regTab[4] = {
+	{0x03, 0x26, 0x04, 0x27},     /* drive 0 */
+	{0x05, 0x28, 0x06, 0x29},     /* drive 1 */
+	{0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
+	{0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
+};
+
+static int basePort = 0;	/* base port address */
+static int regPort = 0;		/* port for register number */
+static int dataPort = 0;	/* port for register data */
+static byte regOn;	/* output to base port to access registers */
+static byte regOff;	/* output to base port to close registers */
+
+/*------------------------------------------------------------------------*/
+
+/*
+ * Read a controller register.
+ */
+static inline byte inReg (byte reg)
+{
+	outb_p(reg, regPort);
+	return inb(dataPort);
+}
+
+/*
+ * Write a controller register.
+ */
+static void outReg (byte data, byte reg)
+{
+	outb_p(reg, regPort);
+	outb_p(data, dataPort);
+}
+
+/*
+ * Set PIO mode for the specified drive.
+ * This function computes timing parameters
+ * and sets controller registers accordingly.
+ */
+static void ali14xx_tune_drive (ide_drive_t *drive, byte pio)
+{
+	int driveNum;
+	int time1, time2, time1a;
+	byte param1, param2, param3, param4;
+	struct hd_driveid *id = drive->id;
+	unsigned long flags;
+
+	if (pio == 255)  {	/* auto-tune */
+		pio = id->tPIO;
+		if ((id->field_valid & 0x02) && (id->eide_pio_modes & 0x01))
+			pio = 3;
+	}
+	/* calculate timing, according to PIO mode */
+	time1 = timeTab[pio].time1;
+	time2 = timeTab[pio].time2;
+	if (pio == 3) {
+		time1a = (id->capability & 0x08) ? id->eide_pio_iordy : id->eide_pio;
+		if (time1a != 0 && time1a < time1)
+			time1 = time1a;
+	}
+	param3 = param1 = (time2 * ALI_14xx_BUS_SPEED + 999) / 1000;
+	param4 = param2 = (time1 * ALI_14xx_BUS_SPEED + 999) / 1000 - param1;
+	if (pio != 3) {
+		param3 += 8;
+		param4 += 8;
+	}
+	printk("%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
+		drive->name, pio, time1, time2, param1, param2, param3, param4);
+
+	/* stuff timing parameters into controller registers */
+	driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
+	save_flags(flags);
+	cli();
+	outb_p(regOn, basePort);
+	outReg(param1, regTab[driveNum].reg1);
+	outReg(param2, regTab[driveNum].reg2);
+	outReg(param3, regTab[driveNum].reg3);
+	outReg(param4, regTab[driveNum].reg4);
+	outb_p(regOff, basePort);
+	restore_flags(flags);
+}
+
+/*
+ * Auto-detect the IDE controller port.
+ */
+static int findPort (void)
+{
+	int i;
+	byte t;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	for (i = 0; i < ALI_NUM_PORTS; ++i) {
+		basePort = ports[i];
+		regOff = inb(basePort);
+		for (regOn = 0x30; regOn <= 0x33; ++regOn) {
+			outb_p(regOn, basePort);
+			if (inb(basePort) == regOn) {
+				regPort = basePort + 4;
+				dataPort = basePort + 8;
+				t = inReg(0) & 0xf0;
+				outb_p(regOff, basePort);
+				restore_flags(flags);
+				if (t != 0x50)
+					return 0;
+				return 1;  /* success */
+			}
+		}
+		outb_p(regOff, basePort);
+	}
+	restore_flags(flags);
+	return 0;
+}
+
+/*
+ * Initialize controller registers with default values.
+ */
+static int initRegisters (void) {
+	RegInitializer *p;
+	byte t;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(regOn, basePort);
+	for (p = initData; p->reg != 0; ++p)
+		outReg(p->data, p->reg);
+	outb_p(0x01, regPort);
+	t = inb(regPort) & 0x01;
+	outb_p(regOff, basePort);
+	restore_flags(flags);
+	return t;
+}
+
+void init_ali14xx (void)
+{
+	/* auto-detect IDE controller port */
+	if (!findPort()) {
+		printk("ali14xx: not found\n");
+		return;
+	}
+
+	printk("ali14xx: base= 0x%03x, regOn = 0x%02x\n", basePort, regOn);
+	ide_hwifs[0].chipset = ide_ali14xx;
+	ide_hwifs[1].chipset = ide_ali14xx;
+	ide_hwifs[0].tuneproc = &ali14xx_tune_drive;
+	ide_hwifs[1].tuneproc = &ali14xx_tune_drive;
+
+	/* initialize controller registers */
+	if (!initRegisters()) {
+		printk("ali14xx: Chip initialization failed\n");
+		return;
+	}
+}