patch-2.3.1 linux/drivers/block/macide.c

• Lines: 168
• Date: Thu May 13 11:04:54 1999
• Orig file: v2.3.0/linux/drivers/block/macide.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.0/linux/drivers/block/macide.c linux/drivers/block/macide.c
@@ -0,0 +1,167 @@
+/*
+ *  linux/drivers/block/macide.c -- Macintosh IDE Driver
+ *
+ *     Copyright (C) 1998 by Michael Schmitz
+ *
+ *  This driver was written based on information obtained from the MacOS IDE
+ *  driver binary by Mikael Forselius
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive for
+ *  more details.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/zorro.h>
+#include <linux/ide.h>
+
+#include <asm/machw.h>
+#include <asm/macintosh.h>
+#include <asm/macints.h>
+
+    /*
+     *  Base of the IDE interface (see ATAManager ROM code)
+     */
+
+#define MAC_HD_BASE	0x50f1a000
+
+    /*
+     *  Offsets from the above base (scaling 4)
+     */
+
+#define MAC_HD_DATA	0x00
+#define MAC_HD_ERROR	0x04		/* see err-bits */
+#define MAC_HD_NSECTOR	0x08		/* nr of sectors to read/write */
+#define MAC_HD_SECTOR	0x0c		/* starting sector */
+#define MAC_HD_LCYL	0x10		/* starting cylinder */
+#define MAC_HD_HCYL	0x14		/* high byte of starting cyl */
+#define MAC_HD_SELECT	0x18		/* 101dhhhh , d=drive, hhhh=head */
+#define MAC_HD_STATUS	0x1c		/* see status-bits */
+#define MAC_HD_CONTROL	0x38		/* control/altstatus */
+
+static int macide_offsets[IDE_NR_PORTS] = {
+    MAC_HD_DATA, MAC_HD_ERROR, MAC_HD_NSECTOR, MAC_HD_SECTOR, MAC_HD_LCYL,
+    MAC_HD_HCYL, MAC_HD_SELECT, MAC_HD_STATUS, MAC_HD_CONTROL
+};
+
+	/*
+	 * Other registers
+	 */
+
+	/* 
+	 * IDE interrupt status register for both (?) hwifs on Quadra
+	 * Initial setting: 0xc
+	 * Guessing again:
+	 * Bit 0+1: some interrupt flags
+	 * Bit 2+3: some interrupt enable
+	 * Bit 4:   ??
+	 * Bit 5:   IDE interrupt flag (any hwif)
+	 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
+	 * Bit 7:   Any interrupt condition
+	 *
+	 * Only relevant item: bit 5, to be checked by mac_ack_intr
+	 */
+
+#define MAC_HD_ISR	0x101
+
+	/*
+	 * IDE interrupt glue - seems to be wired to Nubus, Slot C?
+	 * (ROM code disassembly again)
+	 * First try: just use Nubus interrupt for Slot C. Have Nubus code call
+	 * a wrapper to ide_intr that checks the ISR (see above).
+	 * Need to #define IDE_IRQ_NUBUS though.
+	 * Alternative method: set a mac_ide_hook function pointer to the wrapper 
+	 * here and have via_do_nubus call that hook if set. 
+	 *
+	 * Quadra needs the hook, Powerbook can use Nubus slot C. 
+	 * Checking the ISR on Quadra is done by mac_ack_intr (see Amiga code). mac_ide_intr
+	 * mac_ide_intr is obsolete except for providing the hwgroup argument.
+	 */
+
+	/* The Mac hwif data, for passing hwgroup to ide_intr */
+static ide_hwif_t *mac_hwif = NULL;
+
+	/* The function pointer used in the Nubus handler */
+void (*mac_ide_intr_hook)(int, void *, struct pt_regs *) = NULL;
+
+	/*
+	 * Only purpose: feeds the hwgroup to the main IDE handler. 
+	 * Obsolete as soon as Nubus code is fixed WRT pseudo slot C int.
+	 * (should be the case on Powerbooks)
+	 * Alas, second purpose: feed correct irq to IDE handler (I know,
+	 * that's cheating) :-(((
+	 * Fix needed for interrupt code: accept Nubus ints in the regular
+	 * request_irq code, then register Powerbook IDE as Nubus slot C, 
+	 * Quadra as slot F (F for fictious).
+	 */
+void mac_ide_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+	ide_intr(mac_hwif->irq, mac_hwif->hwgroup, regs);
+}
+
+    /*
+     *  Check the interrupt status
+     *
+     *  Note: In 2.0 kernels, there have been timing problems with the 
+     *  Powerbook IDE interface (BUSY was asserted too long after the
+     *  interrupt triggered). Result: repeated errors, recalibrate etc. 
+     *  Adding a wait loop to read_intr, write_intr and set_geom_intr
+     *  fixed the problem (waits in read/write_intr were present for Amiga
+     *  already). 
+     *  Powerbooks were not tested with 2.1 due to lack of FPU emulation
+     *  (thanks Apple for using LC040). If the BUSY problem resurfaces in 
+     *  2.1, my best bet would be to add the wait loop right here, afterr
+     *  checking the interrupt register.
+     */
+
+static int mac_ack_intr(ide_hwif_t *hwif)
+{
+    unsigned char ch;
+
+    ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
+    if (!(ch & 0x20))
+	return 0;
+    return 1;
+}
+
+    /*
+     *  Probe for a Macintosh IDE interface
+     */
+
+void macide_init(void)
+{
+    hw_regs_t hw;
+    int index = -1;
+
+    if (MACH_IS_MAC) {
+	switch(macintosh_config->ide_type) {
+	case 0:
+	    break;
+
+	case MAC_IDE_QUADRA:
+	    ide_setup_ports(&hw, (ide_ioreg_t)MAC_HD_BASE, macide_offsets,
+	    		    0, (ide_ioreg_t)(MAC_HD_BASE+MAC_HD_ISR),
+			    mac_ack_intr, IRQ_MAC_NUBUS);
+	    index = ide_register_hw(&hw, &mac_hwif);
+	    mac_ide_intr_hook = mac_ide_intr;
+	    break;
+
+	default:
+	    ide_setup_ports(&hw, (ide_ioreg_t)MAC_HD_BASE, macide_offsets,
+	    		    0, 0, NULL, IRQ_MAC_NUBUS);
+	    index = ide_register_hw(&hw, &mac_hwif);
+	    break;
+	}
+
+        if (index != -1) {
+	    if (macintosh_config->ide_type == MAC_IDE_QUADRA)
+		printk("ide%d: Macintosh Quadra IDE interface\n", index);
+	    else
+		printk("ide%d: Macintosh Powerbook IDE interface\n", index);
+	}
+    }
+}