patch-2.4.21 linux-2.4.21/drivers/ide/legacy/ali14xx.c

• Lines: 305
• Date: 2003-06-13 07:51:33.000000000 -0700
• Orig file: linux-2.4.20/drivers/ide/legacy/ali14xx.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/ide/legacy/ali14xx.c linux-2.4.21/drivers/ide/legacy/ali14xx.c
@@ -0,0 +1,304 @@
+/*
+ *  linux/drivers/ide/legacy/ali14xx.c		Version 0.03	Feb 09, 1996
+ *
+ *  Copyright (C) 1996  Linus Torvalds & author (see below)
+ */
+
+/*
+ * ALI M14xx chipset EIDE controller
+ *
+ * Works for ALI M1439/1443/1445/1487/1489 chipsets.
+ *
+ * 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
+ *
+ * Update 96-jul-13:
+ *
+ * I've since upgraded to two disks and a CD-ROM, with no trouble, and
+ * I've also heard from several others who have used it successfully.
+ * This driver appears to work with both the 1443/1445 and the 1487/1489
+ * chipsets.  I've added support for PIO mode 4 for the 1487.  This
+ * seems to work just fine on the 1443 also, although I'm not sure it's
+ * advertised as supporting mode 4.  (I've been running a WDC AC21200 in
+ * mode 4 for a while now with no trouble.)  -Derek
+ */
+
+#undef REALLY_SLOW_IO           /* most systems can safely undef this */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#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 <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+#ifdef CONFIG_BLK_DEV_ALI14XX_MODULE
+# define _IDE_C
+# include "ide_modes.h"
+# undef _IDE_C
+#else
+# include "ide_modes.h"
+#endif /* CONFIG_BLK_DEV_ALI14XX_MODULE */
+
+/* port addresses for auto-detection */
+#define ALI_NUM_PORTS 4
+static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
+
+/* register initialization data */
+typedef struct { u8 reg, data; } RegInitializer;
+
+static RegInitializer initData[] __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}
+};
+
+#define ALI_MAX_PIO 4
+
+/* timing parameter registers for each drive */
+static struct { u8 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;	/* base port address */
+static int regPort;	/* port for register number */
+static int dataPort;	/* port for register data */
+static u8 regOn;	/* output to base port to access registers */
+static u8 regOff;	/* output to base port to close registers */
+
+/*------------------------------------------------------------------------*/
+
+/*
+ * Read a controller register.
+ */
+static inline u8 inReg (u8 reg)
+{
+	outb_p(reg, regPort);
+	return inb(dataPort);
+}
+
+/*
+ * Write a controller register.
+ */
+static void outReg (u8 data, u8 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, u8 pio)
+{
+	int driveNum;
+	int time1, time2;
+	u8 param1, param2, param3, param4;
+	unsigned long flags;
+	ide_pio_data_t d;
+	int bus_speed = system_bus_clock();
+
+	pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
+
+	/* calculate timing, according to PIO mode */
+	time1 = d.cycle_time;
+	time2 = ide_pio_timings[pio].active_time;
+	param3 = param1 = (time2 * bus_speed + 999) / 1000;
+	param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
+	if (pio < 3) {
+		param3 += 8;
+		param4 += 8;
+	}
+	printk(KERN_DEBUG "%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;
+	spin_lock_irqsave(&io_request_lock, flags);
+	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);
+	spin_unlock_irqrestore(&io_request_lock, flags);
+}
+
+/*
+ * Auto-detect the IDE controller port.
+ */
+static int __init findPort (void)
+{
+	int i;
+	u8 t;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	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);
+				local_irq_restore(flags);
+				if (t != 0x50)
+					return 0;
+				return 1;  /* success */
+			}
+		}
+		outb_p(regOff, basePort);
+	}
+	local_irq_restore(flags);
+	return 0;
+}
+
+/*
+ * Initialize controller registers with default values.
+ */
+static int __init initRegisters (void) {
+	RegInitializer *p;
+	u8 t;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	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);
+	local_irq_restore(flags);
+	return t;
+}
+
+int __init probe_ali14xx (void)
+{
+	/* auto-detect IDE controller port */
+	if (!findPort()) {
+		printk(KERN_ERR "ali14xx: not found.\n");
+		return 1;
+	}
+
+	printk(KERN_DEBUG "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;
+	ide_hwifs[0].mate = &ide_hwifs[1];
+	ide_hwifs[1].mate = &ide_hwifs[0];
+	ide_hwifs[1].channel = 1;
+
+	/* initialize controller registers */
+	if (!initRegisters()) {
+		printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
+		return 1;
+	}
+
+#ifndef HWIF_PROBE_CLASSIC_METHOD
+	probe_hwif_init(&ide_hwifs[0]);
+	probe_hwif_init(&ide_hwifs[1]);
+#endif /* HWIF_PROBE_CLASSIC_METHOD */
+
+	return 0;
+}
+
+void __init ali14xx_release (void)
+{
+	if (ide_hwifs[0].chipset != ide_ali14xx &&
+	    ide_hwifs[1].chipset != ide_ali14xx)
+		return;
+
+	ide_hwifs[0].chipset = ide_unknown;
+	ide_hwifs[1].chipset = ide_unknown;
+	ide_hwifs[0].tuneproc = NULL;
+	ide_hwifs[1].tuneproc = NULL;
+	ide_hwifs[0].mate = NULL;
+	ide_hwifs[1].mate = NULL;
+}
+
+#ifndef MODULE
+/*
+ * init_ali14xx:
+ *
+ * called by ide.c when parsing command line
+ */
+
+void __init init_ali14xx (void)
+{
+	/* auto-detect IDE controller port */
+        if (findPort())
+		if (probe_ali14xx())
+			goto no_detect;
+	return;
+
+no_detect:
+	printk(KERN_ERR "ali14xx: not found.\n");
+	ali14xx_release();
+}
+
+#else
+
+MODULE_AUTHOR("see local file");
+MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
+MODULE_LICENSE("GPL");
+
+int __init ali14xx_mod_init(void)
+{
+	/* auto-detect IDE controller port */
+	if (findPort())
+		if (probe_ali14xx()) {
+			ali14xx_release();
+			return -ENODEV;
+		}
+
+	if (ide_hwifs[0].chipset != ide_ali14xx &&
+	    ide_hwifs[1].chipset != ide_ali14xx) {
+		ali14xx_release();
+		return -ENODEV;
+	}
+	return 0;
+}
+module_init(ali14xx_mod_init);
+
+void __init ali14xx_mod_exit(void)
+{
+	ali14xx_release();
+}
+module_exit(ali14xx_mod_exit);
+#endif
+