patch-1.3.45 linux/drivers/block/cmd640.c

• Lines: 445
• Date: Mon Nov 27 09:36:21 1995
• Orig file: v1.3.44/linux/drivers/block/cmd640.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.44/linux/drivers/block/cmd640.c linux/drivers/block/cmd640.c
@@ -0,0 +1,444 @@
+/*
+ *  linux/drivers/block/cmd640.c	Version 0.01  Nov 16, 1995
+ *
+ *  Copyright (C) 1995  Linus Torvalds & author (see below)
+ */
+
+/*
+ *  Principal Author/Maintainer:  abramov@cecmow.enet.dec.com (Igor)
+ *
+ *  This file provides support for the advanced features and bugs
+ *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
+ *
+ *  Version 0.01	Initial version, hacked out of ide.c,
+ *			and #include'd rather than compiled separately.
+ *			This will get cleaned up in a subsequent release.
+ */
+
+/* Interface to access cmd640x registers */
+static void (*put_cmd640_reg)(int key, int reg_no, int val);
+static byte (*get_cmd640_reg)(int key, int reg_no);
+
+enum { none, vlb, pci1, pci2 };
+static int	bus_type = none;
+static int	cmd640_chip_version;
+static int	cmd640_key;
+static byte	is_cmd640[MAX_HWIFS];
+
+/*
+ * For some unknown reasons pcibios functions which read and write registers
+ * do not work with cmd640. We use direct io instead.
+ */
+
+/* PCI method 1 access */
+
+static void put_cmd640_reg_pci1(int key, int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outl_p((reg_no & 0xfc) | key, 0xcf8);
+	outb_p(val, (reg_no & 3) + 0xcfc);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_pci1(int key, int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outl_p((reg_no & 0xfc) | key, 0xcf8);
+	b = inb(0xcfc + (reg_no & 3));
+	restore_flags(flags);
+	return b;
+}
+
+/* PCI method 2 access (from CMD datasheet) */
+
+static void put_cmd640_reg_pci2(int key, int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(0x10, 0xcf8);
+	outb_p(val, key + reg_no);
+	outb_p(0, 0xcf8);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_pci2(int key, int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(0x10, 0xcf8);
+	b = inb(key + reg_no);
+	outb_p(0, 0xcf8);
+	restore_flags(flags);
+	return b;
+}
+
+/* VLB access */
+
+static void put_cmd640_reg_vlb(int key, int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb(reg_no, key + 8);
+	outb(val, key + 0xc);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_vlb(int key, int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb(reg_no, key + 8);
+	b = inb(key + 0xc);
+	restore_flags(flags);
+	return b;
+}
+
+/*
+ * Probe for CMD640x -- pci method 1
+ */
+
+static int probe_for_cmd640_pci1(void)
+{
+	long id;
+	int	k;
+
+	for (k = 0x80000000; k <= 0x8000f800; k += 0x800) {
+		outl(k, 0xcf8);
+		id = inl(0xcfc);
+		if (id != 0x06401095)
+			continue;
+		put_cmd640_reg = put_cmd640_reg_pci1;
+		get_cmd640_reg = get_cmd640_reg_pci1;
+		cmd640_key = k;
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Probe for CMD640x -- pci method 2
+ */
+
+static int probe_for_cmd640_pci2(void)
+{
+	int i;
+	int v_id;
+	int d_id;
+
+	for (i = 0xc000; i <= 0xcf00; i += 0x100) {
+		outb(0x10, 0xcf8);
+		v_id = inw(i);
+		d_id = inw(i + 2);
+		outb(0, 0xcf8);
+		if (v_id != 0x1095 || d_id != 0x640)
+			continue;
+		put_cmd640_reg = put_cmd640_reg_pci2;
+		get_cmd640_reg = get_cmd640_reg_pci2;
+		cmd640_key = i;
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Probe for CMD640x -- vlb
+ */
+
+static int probe_for_cmd640_vlb(void) {
+	byte b;
+
+	outb(0x50, 0x178);
+	b = inb(0x17c);
+	if (b == 0xff || b == 0 || (b & 0x20)) {
+		outb(0x50, 0xc78);
+		b = inb(0x7c);
+		if (b == 0xff || b == 0 || !(b & 0x20))
+			return 0;
+		cmd640_key = 0x70;
+	} else {
+		cmd640_key = 0x170;
+	}
+	put_cmd640_reg = put_cmd640_reg_vlb;
+	get_cmd640_reg = get_cmd640_reg_vlb;
+	return 1;
+}
+
+/*
+ * Probe for Cmd640x and initialize it if found
+ */
+
+int ide_probe_for_cmd640x(void)
+{
+	int i;
+
+	for (i = 0; i < MAX_HWIFS; i++)
+		is_cmd640[i] = 0;
+
+	if (probe_for_cmd640_pci1()) {
+		bus_type = pci1;
+	} else if (probe_for_cmd640_pci2()) {
+		bus_type = pci2;
+	} else if (cmd640_vlb && probe_for_cmd640_vlb()) {
+		/* May be remove cmd640_vlb at all, and probe in any case */
+		bus_type = vlb;
+	} else {
+		return 0;
+	}
+
+	/*
+	 * Undocumented magic. (There is no 0x5b port in specs)
+	 */
+
+	put_cmd640_reg(cmd640_key, 0x5b, 0xbd);
+	if (get_cmd640_reg(cmd640_key, 0x5b) != 0xbd) {
+		printk("ide: can't initialize cmd640 -- wrong value in 0x5b\n");
+		return 0;
+	}
+	put_cmd640_reg(cmd640_key, 0x5b, 0);
+
+	/*
+	 * Documented magic.
+	 */
+
+	cmd640_chip_version = get_cmd640_reg(cmd640_key, 0x50) & 3;
+	if (cmd640_chip_version == 0) {
+		printk ("ide: wrong CMD640 version -- 0\n");
+		return 0;
+	}
+
+	put_cmd640_reg(cmd640_key, 0x51, get_cmd640_reg(cmd640_key, 0x51) | 0xc8);
+	put_cmd640_reg(cmd640_key, 0x57, 0);
+	put_cmd640_reg(cmd640_key, 0x57, get_cmd640_reg(cmd640_key, 0x57) | 0x0c);
+
+	serialized = 1;
+
+	printk("ide: buggy CMD640 interface at ");
+	switch (bus_type) {
+		case vlb :
+			printk("local bus, port 0x%x", cmd640_key);
+			break;
+		case pci1:
+			printk("pci, (0x%x)", cmd640_key);
+			break;
+		case pci2:
+			printk("pci,(access method 2) (0x%x)", cmd640_key);
+			break;
+	}
+
+	is_cmd640[0] = is_cmd640[1] = 1;
+
+	/*
+	 * Reset interface timings
+	 */
+
+	put_cmd640_reg(cmd640_key, 0x58, 0);
+	put_cmd640_reg(cmd640_key, 0x52, 0);
+
+	printk("\n ... serialized, disabled read-ahead, secondary interface enabled\n");
+
+	return 1;
+}
+
+static int as_clocks(int a) {
+	switch (a & 0xf0) {
+		case 0 :	return 4;
+		case 0x40 :	return 2;
+		case 0x80 :	return 3;
+		case 0xc0 :	return 5;
+		default :	return -1;
+	}
+}
+
+/*
+ * Tuning of drive parameters
+ */
+
+static void cmd640_set_timing(int if_num, int dr_num, int r1, int r2) {
+	int  b_reg;
+	byte b;
+	int  r52;
+
+	b_reg = if_num ? 0x57 : dr_num ? 0x55 : 0x53;
+
+	if (if_num == 0) {
+		put_cmd640_reg(cmd640_key, b_reg, r1);
+		put_cmd640_reg(cmd640_key, b_reg + 1, r2);
+	} else {
+		b = get_cmd640_reg(cmd640_key, b_reg);
+		if ((b&1) == 0) {
+			put_cmd640_reg(cmd640_key, b_reg, r1);
+		} else {
+			if (as_clocks(b) < as_clocks(r1))
+				put_cmd640_reg(cmd640_key, b_reg, r1);
+		}
+		b = get_cmd640_reg(cmd640_key, b_reg + 1);
+		if (b == 0) {
+			put_cmd640_reg(cmd640_key, b_reg + 1, r2);
+		} else {
+			r52 = (b&0xf) < (r2&0xf) ? (r2&0xf) : (b&0xf);
+			r52 |= (b&0xf0) < (r2&0xf0) ? (r2&0xf0) : (b&0xf0);
+			put_cmd640_reg(cmd640_key, b_reg+1, r52);
+		}
+	}
+
+	b = get_cmd640_reg(cmd640_key, 0x52);
+	if (b == 0) {
+		put_cmd640_reg(cmd640_key, 0x52, r2);
+	} else {
+		r52 = (b&0xf) < (r2&0xf) ? (r2&0xf) : (b&0xf);
+		r52 |= (b&0xf0) < (r2&0xf0) ? (r2&0xf0) : (b&0xf0);
+		put_cmd640_reg(cmd640_key, 0x52, r52);
+	}
+}
+
+static int bus_speed = 33; /* MHz */
+
+struct pio_timing {
+	int	mc_time;	/* Minimal cycle time (ns) */
+	int	av_time;	/* Address valid to DIOR-/DIOW- setup (ns) */
+	int	ds_time;	/* DIOR data setup	(ns) */
+} pio_timings[6] = {
+	{ 70,	165,	600 },	/* PIO Mode 0 */
+	{ 50,	125,	383 },	/* PIO Mode 1 */
+	{ 30,	100,	240 },	/* PIO Mode 2 */
+	{ 30,	80,	180 },	/* PIO Mode 3 */
+	{ 25,	70,	125 },	/* PIO Mode 4 */
+	{ 20,	50,	100 }	/* PIO Mode ? */
+};
+
+struct drive_pio_info {
+	const char	*name;
+	int		pio;
+} drive_pios[] = {
+	{ "Maxtor 7131 AT", 1 },
+	{ "Maxtor 7171 AT", 1 },
+	{ "Maxtor 7213 AT", 1 },
+	{ "Maxtor 7245 AT", 1 },
+	{ "SAMSUNG SHD-3122A", 1 },
+	{ "QUANTUM ELS127A", 0 },
+	{ "QUANTUM LPS240A", 0 },
+	{ "QUANTUM LPS270A", 3 },
+	{ "QUANTUM LPS540A", 3 },
+	{ NULL,	0 }
+};
+
+static int known_drive_pio(char* name) {
+	struct drive_pio_info* pi;
+
+	for (pi = drive_pios; pi->name != NULL; pi++) {
+		if (strcmp(pi->name, name) == 0)
+			return pi->pio;
+	}
+	return -1;
+}
+
+static void cmd640_timings_to_regvals(int mc_time, int av_time, int ds_time,
+				int clock_time,
+				int* r1, int* r2)
+{
+	int a, b;
+
+	a = (mc_time + clock_time - 1)/clock_time;
+	if (a <= 2) *r1 = 0x40;
+	else if (a == 3) *r1 = 0x80;
+	else if (a == 4) *r1 = 0;
+	else *r1 = 0xc0;
+
+	a = (av_time + clock_time - 1)/clock_time;
+	if (a < 2)
+		a = 2;
+	b = (ds_time + clock_time - 1)/clock_time - a;
+	if (b < 2)
+		b = 2;
+	if (b > 0x11) {
+		a += b - 0x11;
+		b = 0x11;
+	}
+	if (a > 0xf)
+		a = 0;
+	if (cmd640_chip_version > 1)
+		b -= 1;
+	if (b > 0xf)
+		b = 0;
+	*r2 = (a << 4) | b;
+}
+
+static void set_pio_mode(int if_num, int drv_num, int mode_num) {
+	int p_base;
+	int i;
+
+	p_base = if_num ? 0x170 : 0x1f0;
+	outb(3, p_base + 1);
+	outb(mode_num | 8, p_base + 2);
+	outb((drv_num | 0xa) << 4, p_base + 6);
+	outb(0xef, p_base + 7);
+	for (i = 0; (i < 100) && (inb (p_base + 7) & 0x80); i++)
+		delay_10ms();
+}
+
+void cmd640_tune_drive(ide_drive_t* drive) {
+	int interface_number;
+	int drive_number;
+	int clock_time; /* ns */
+	int max_pio;
+	int mc_time, av_time, ds_time;
+	struct hd_driveid* id;
+	int r1, r2;
+
+	/*
+	 * Determine if drive is under cmd640 control
+	 */
+	interface_number = HWIF(drive) - ide_hwifs;
+	if (!is_cmd640[interface_number])
+		return;
+
+	drive_number = drive - HWIF(drive)->drives;
+	clock_time = 1000/bus_speed;
+	id = drive->id;
+	if ((max_pio = known_drive_pio(id->model)) != -1) {
+		mc_time = pio_timings[max_pio].mc_time;
+		av_time = pio_timings[max_pio].av_time;
+		ds_time = pio_timings[max_pio].ds_time;
+	} else {
+		max_pio = id->tPIO;
+		mc_time = pio_timings[max_pio].mc_time;
+		av_time = pio_timings[max_pio].av_time;
+		ds_time = pio_timings[max_pio].ds_time;
+		if (id->field_valid & 2) {
+			if ((id->capability & 8) && (id->eide_pio_modes & 7)) {
+				if (id->eide_pio_modes & 4) max_pio = 5;
+				else if (id->eide_pio_modes & 2) max_pio = 4;
+				else max_pio = 3;
+				ds_time = id->eide_pio_iordy;
+				mc_time = pio_timings[max_pio].mc_time;
+				av_time = pio_timings[max_pio].av_time;
+			} else {
+				ds_time = id->eide_pio;
+			}
+			if (ds_time == 0)
+				ds_time = pio_timings[max_pio].ds_time;
+		}
+	}
+	cmd640_timings_to_regvals(mc_time, av_time, ds_time, clock_time,
+				&r1, &r2);
+	set_pio_mode(interface_number, drive_number, max_pio);
+	cmd640_set_timing(interface_number, drive_number, r1, r2);
+	printk ("Mode and Timing set to PIO%d (0x%x 0x%x)\n", max_pio, r1, r2);
+}