patch-2.1.119 linux/drivers/block/ide-pmac.c

• Lines: 299
• Date: Thu Aug 27 11:03:56 1998
• Orig file: v2.1.118/linux/drivers/block/ide-pmac.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.118/linux/drivers/block/ide-pmac.c linux/drivers/block/ide-pmac.c
@@ -0,0 +1,298 @@
+/*
+ * Support for IDE interfaces on PowerMacs.
+ * These IDE interfaces are memory-mapped and have a DBDMA channel
+ * for doing DMA.
+ *
+ *  Copyright (C) 1998 Paul Mackerras.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ * Some code taken from drivers/block/ide-dma.c:
+ *
+ *  Copyright (c) 1995-1998  Mark Lord
+ *
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/ide.h>
+#include <asm/mediabay.h>
+#include "ide.h"
+
+ide_ioreg_t pmac_ide_regbase[MAX_HWIFS];
+int pmac_ide_irq[MAX_HWIFS];
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+#define MAX_DCMDS	256	/* allow up to 256 DBDMA commands per xfer */
+
+static void pmac_ide_setup_dma(struct device_node *np, ide_hwif_t *hwif);
+static int pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive);
+static int pmac_ide_build_dmatable(ide_drive_t *drive, int wr);
+#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
+
+__initfunc(void
+pmac_ide_init_hwif_ports(ide_ioreg_t *p, ide_ioreg_t base, int *irq))
+{
+	int i;
+
+	*p = 0;
+	if (base == 0)
+		return;
+	if (base == mb_cd_base && !check_media_bay(MB_CD)) {
+		mb_cd_index = -1;
+		return;
+	}
+	for (i = 0; i < 8; ++i)
+		*p++ = base + i * 0x10;
+	*p = base + 0x160;
+	if (irq != NULL) {
+		*irq = 0;
+		for (i = 0; i < MAX_HWIFS; ++i) {
+			if (base == pmac_ide_regbase[i]) {
+				*irq = pmac_ide_irq[i];
+				break;
+			}
+		}
+	}
+}
+
+__initfunc(void
+pmac_ide_probe(void))
+{
+	struct device_node *np;
+	int i;
+	struct device_node *atas;
+	struct device_node *p, **pp, *removables, **rp;
+	unsigned long base;
+	int irq;
+	ide_hwif_t *hwif;
+
+	if (_machine != _MACH_Pmac)
+		return;
+	pp = &atas;
+	rp = &removables;
+	p = find_devices("ATA");
+	if (p == NULL)
+		p = find_devices("IDE");
+	if (p == NULL)
+		p = find_type_devices("ide");
+	if (p == NULL)
+		p = find_type_devices("ata");
+	/* Move removable devices such as the media-bay CDROM
+	   on the PB3400 to the end of the list. */
+	for (; p != NULL; p = p->next) {
+		if (p->parent && p->parent->name
+		    && strcasecmp(p->parent->name, "media-bay") == 0) {
+			*rp = p;
+			rp = &p->next;
+		} else {
+			*pp = p;
+			pp = &p->next;
+		}
+	}
+	*rp = NULL;
+	*pp = removables;
+
+	for (i = 0, np = atas; i < MAX_HWIFS && np != NULL; np = np->next) {
+		if (np->n_addrs == 0) {
+			printk(KERN_WARNING "ide: no address for device %s\n",
+			       np->full_name);
+			continue;
+		}
+		base = (unsigned long) ioremap(np->addrs[0].address, 0x200);
+		if (np->n_intrs == 0) {
+			printk("ide: no intrs for device %s, using 13\n",
+			       np->full_name);
+			irq = 13;
+		} else {
+			irq = np->intrs[0].line;
+		}
+		pmac_ide_regbase[i] = base;
+		pmac_ide_irq[i] = irq;
+
+		if (np->parent && np->parent->name
+		    && strcasecmp(np->parent->name, "media-bay") == 0) {
+			mb_cd_index = i;
+			mb_cd_base = base;
+			mb_cd_irq = irq;
+		}
+
+		hwif = &ide_hwifs[i];
+		pmac_ide_init_hwif_ports(hwif->io_ports, base, &hwif->irq);
+		hwif->chipset = ide_generic;
+		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+		if (np->n_addrs >= 2 && np->n_intrs >= 2) {
+			/* has a DBDMA controller channel */
+			pmac_ide_setup_dma(np, hwif);
+		}
+#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
+
+		++i;
+	}
+}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+
+__initfunc(static void
+pmac_ide_setup_dma(struct device_node *np, ide_hwif_t *hwif))
+{
+	hwif->dma_base = (unsigned long) ioremap(np->addrs[1].address, 0x200);
+
+	/*
+	 * Allocate space for the DBDMA commands.
+	 * The +2 is +1 for the stop command and +1 to allow for
+	 * aligning the start address to a multiple of 16 bytes.
+	 */
+	hwif->dmatable = (unsigned long *)
+	       kmalloc((MAX_DCMDS + 2) * sizeof(struct dbdma_cmd), GFP_KERNEL);
+	if (hwif->dmatable == 0) {
+		printk(KERN_ERR "%s: unable to allocate DMA command list\n",
+		       hwif->name);
+		return;
+	}
+
+	hwif->dmaproc = &pmac_ide_dmaproc;
+#ifdef CONFIG_PMAC_IDEDMA_AUTO
+	hwif->autodma = 1;
+#endif
+}
+
+/*
+ * pmac_ide_build_dmatable builds the DBDMA command list
+ * for a transfer and sets the DBDMA channel to point to it.
+ */
+static int
+pmac_ide_build_dmatable(ide_drive_t *drive, int wr)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	struct dbdma_cmd *table, *tstart;
+	int count = 0;
+	struct request *rq = HWGROUP(drive)->rq;
+	struct buffer_head *bh = rq->bh;
+	unsigned int size, addr;
+	volatile struct dbdma_regs *dma
+		= (volatile struct dbdma_regs *) hwif->dma_base;
+
+	table = tstart = (struct dbdma_cmd *) DBDMA_ALIGN(hwif->dmatable);
+	out_le32(&dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
+
+	do {
+		/*
+		 * Determine addr and size of next buffer area.  We assume that
+		 * individual virtual buffers are always composed linearly in
+		 * physical memory.  For example, we assume that any 8kB buffer
+		 * is always composed of two adjacent physical 4kB pages rather
+		 * than two possibly non-adjacent physical 4kB pages.
+		 */
+		if (bh == NULL) {  /* paging requests have (rq->bh == NULL) */
+			addr = virt_to_bus(rq->buffer);
+			size = rq->nr_sectors << 9;
+		} else {
+			/* group sequential buffers into one large buffer */
+			addr = virt_to_bus(bh->b_data);
+			size = bh->b_size;
+			while ((bh = bh->b_reqnext) != NULL) {
+				if ((addr + size) != virt_to_bus(bh->b_data))
+					break;
+				size += bh->b_size;
+			}
+		}
+
+		/*
+		 * Fill in the next DBDMA command block.
+		 * Note that one DBDMA command can transfer
+		 * at most 65535 bytes.
+		 */
+		while (size) {
+			unsigned int tc = (size < 0xfe00)? size: 0xfe00;
+
+			if (++count >= MAX_DCMDS) {
+				printk("%s: DMA table too small\n",
+				       drive->name);
+				return 0; /* revert to PIO for this request */
+			}
+			st_le16(&table->command, wr? OUTPUT_MORE: INPUT_MORE);
+			st_le16(&table->req_count, tc);
+			st_le32(&table->phy_addr, addr);
+			table->cmd_dep = 0;
+			table->xfer_status = 0;
+			table->res_count = 0;
+			addr += tc;
+			size -= tc;
+			++table;
+		}
+	} while (bh != NULL);
+
+	/* convert the last command to an input/output last command */
+	if (count)
+		st_le16(&table[-1].command, wr? OUTPUT_LAST: INPUT_LAST);
+	else
+		printk(KERN_DEBUG "%s: empty DMA table?\n", drive->name);
+
+	/* add the stop command to the end of the list */
+	memset(table, 0, sizeof(struct dbdma_cmd));
+	out_le16(&table->command, DBDMA_STOP);
+
+	out_le32(&dma->cmdptr, virt_to_bus(tstart));
+	return 1;
+}
+
+int pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	volatile struct dbdma_regs *dma
+		= (volatile struct dbdma_regs *) hwif->dma_base;
+	int dstat;
+
+	switch (func) {
+	case ide_dma_on:
+		/* ide-floppy DMA doesn't work yet... */
+		drive->using_dma = drive->media != ide_floppy;
+		break;
+	case ide_dma_off:
+		printk(KERN_INFO "%s: DMA disabled\n", drive->name);
+	case ide_dma_off_quietly:
+		drive->using_dma = 0;
+		break;
+	case ide_dma_check:
+		/* ide-floppy DMA doesn't work yet... */
+		drive->using_dma = hwif->autodma && drive->media != ide_floppy;
+		break;
+	case ide_dma_read:
+	case ide_dma_write:
+		if (!pmac_ide_build_dmatable(drive, func==ide_dma_write))
+			return 1;
+		drive->waiting_for_dma = 1;
+		if (drive->media != ide_disk)
+			return 0;
+		ide_set_handler(drive, &ide_dma_intr, WAIT_CMD);
+		OUT_BYTE(func==ide_dma_write? WIN_WRITEDMA: WIN_READDMA,
+			 IDE_COMMAND_REG);
+	case ide_dma_begin:
+		out_le32(&dma->control, (RUN << 16) | RUN);
+		break;
+	case ide_dma_end:
+		drive->waiting_for_dma = 0;
+		dstat = in_le32(&dma->status);
+		out_le32(&dma->control, ((RUN|WAKE|DEAD) << 16));
+		/* verify good dma status */
+		return (dstat & (RUN|DEAD|ACTIVE)) != RUN;
+	case ide_dma_test_irq:
+		return (in_le32(&dma->status) & (RUN|ACTIVE)) == RUN;
+	default:
+		printk(KERN_ERR "pmac_ide_dmaproc: bad func %d\n", func);
+	}
+	return 0;
+}
+
+#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */