Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 520 insertions, 0 deletions

diff --git a/drivers/scsi/mca_53c9x.c b/drivers/scsi/mca_53c9x.c
new file mode 100644
index 000000000000..194c75451faf
--- /dev/null
+++ b/drivers/scsi/mca_53c9x.c
@@ -0,0 +1,520 @@
+/* mca_53c9x.c: Driver for the SCSI adapter found on NCR 35xx
+ *  (and maybe some other) Microchannel machines
+ *
+ * Code taken mostly from Cyberstorm SCSI drivers
+ *   Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
+ *
+ * Hacked to work with the NCR MCA stuff by Tymm Twillman (tymm@computer.org)
+ *
+ * The CyberStorm SCSI driver (and this driver) is based on David S. Miller's
+ *   ESP driver  * for the Sparc computers. 
+ * 
+ * Special thanks to Ken Stewart at Symbios (LSI) for helping with info on
+ *  the 86C01.  I was on the brink of going ga-ga...
+ *
+ * Also thanks to Jesper Skov for helping me with info on how the Amiga
+ *  does things...
+ */
+
+/*
+ * This is currently only set up to use one 53c9x card at a time; it could be 
+ *  changed fairly easily to detect/use more than one, but I'm not too sure how
+ *  many cards that use the 53c9x on MCA systems there are (if, in fact, there
+ *  are cards that use them, other than the one built into some NCR systems)...
+ *  If anyone requests this, I'll throw it in, otherwise it's not worth the
+ *  effort.
+ */
+
+/*
+ * Info on the 86C01 MCA interface chip at the bottom, if you care enough to
+ *  look.
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mca.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/mca-legacy.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "NCR53C9x.h"
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mca_dma.h>
+#include <asm/pgtable.h>
+
+/*
+ * From ibmmca.c (IBM scsi controller card driver) -- used for turning PS2 disk
+ *  activity LED on and off
+ */
+
+#define PS2_SYS_CTR	0x92
+
+/* Ports the ncr's 53c94 can be put at; indexed by pos register value */
+
+#define MCA_53C9X_IO_PORTS {                             \
+                         0x0000, 0x0240, 0x0340, 0x0400, \
+	                 0x0420, 0x3240, 0x8240, 0xA240, \
+	                }
+			
+/*
+ * Supposedly there were some cards put together with the 'c9x and 86c01.  If
+ *   they have different ID's from the ones on the 3500 series machines, 
+ *   you can add them here and hopefully things will work out.
+ */
+			
+#define MCA_53C9X_IDS {          \
+                         0x7F4C, \
+			 0x0000, \
+                        }
+
+static int  dma_bytes_sent(struct NCR_ESP *, int);
+static int  dma_can_transfer(struct NCR_ESP *, Scsi_Cmnd *);
+static void dma_dump_state(struct NCR_ESP *);
+static void dma_init_read(struct NCR_ESP *, __u32, int);
+static void dma_init_write(struct NCR_ESP *, __u32, int);
+static void dma_ints_off(struct NCR_ESP *);
+static void dma_ints_on(struct NCR_ESP *);
+static int  dma_irq_p(struct NCR_ESP *);
+static int  dma_ports_p(struct NCR_ESP *);
+static void dma_setup(struct NCR_ESP *, __u32, int, int);
+static void dma_led_on(struct NCR_ESP *);
+static void dma_led_off(struct NCR_ESP *);
+
+/* This is where all commands are put before they are trasfered to the 
+ *  53c9x via PIO.
+ */
+
+static volatile unsigned char cmd_buffer[16];
+
+/*
+ * We keep the structure that is used to access the registers on the 53c9x
+ *  here.
+ */
+
+static struct ESP_regs eregs;
+
+/***************************************************************** Detection */
+static int mca_esp_detect(Scsi_Host_Template *tpnt)
+{
+	struct NCR_ESP *esp;
+	static int io_port_by_pos[] = MCA_53C9X_IO_PORTS;
+	int mca_53c9x_ids[] = MCA_53C9X_IDS;
+	int *id_to_check = mca_53c9x_ids;
+	int slot;
+	int pos[3];
+	unsigned int tmp_io_addr;
+	unsigned char tmp_byte;
+
+
+	if (!MCA_bus)
+		return 0;
+
+	while (*id_to_check) { 
+		if ((slot = mca_find_adapter(*id_to_check, 0)) !=
+		  MCA_NOTFOUND) 
+		{
+			esp = esp_allocate(tpnt, (void *) NULL);
+
+			pos[0] = mca_read_stored_pos(slot, 2);
+			pos[1] = mca_read_stored_pos(slot, 3);
+			pos[2] = mca_read_stored_pos(slot, 4);
+
+			esp->eregs = &eregs;
+
+			/*
+			 * IO port base is given in the first (non-ID) pos
+			 *  register, like so:
+			 *
+			 *  Bits 3  2  1       IO base
+			 * ----------------------------
+			 *       0  0  0       <disabled>
+			 *       0  0  1       0x0240
+			 *       0  1  0       0x0340
+			 *       0  1  1       0x0400
+			 *       1  0  0       0x0420
+			 *       1  0  1       0x3240
+			 *       1  1  0       0x8240
+			 *       1  1  1       0xA240
+			 */
+
+			tmp_io_addr =
+			  io_port_by_pos[(pos[0] & 0x0E) >> 1];
+
+			esp->eregs->io_addr = tmp_io_addr + 0x10;
+
+      			if (esp->eregs->io_addr == 0x0000) { 
+        			printk("Adapter is disabled.\n");
+				break;
+			}
+
+			/*
+			 * IRQ is specified in bits 4 and 5:
+			 *
+			 *  Bits  4  5        IRQ
+			 * -----------------------
+			 *        0  0         3
+			 *        0  1         5
+			 *        1  0         7
+			 *        1  1         9
+			 */
+
+      			esp->irq = ((pos[0] & 0x30) >> 3) + 3;
+
+			/*
+			 * DMA channel is in the low 3 bits of the second
+			 *  POS register
+			 */
+
+			esp->dma = pos[1] & 7;
+			esp->slot = slot;
+
+			if (request_irq(esp->irq, esp_intr, 0,
+			 "NCR 53c9x SCSI", esp->ehost))
+			{
+				printk("Unable to request IRQ %d.\n", esp->irq);
+				esp_deallocate(esp);
+				scsi_unregister(esp->ehost);
+				return 0;
+			}
+
+ 			if (request_dma(esp->dma, "NCR 53c9x SCSI")) {
+				printk("Unable to request DMA channel %d.\n",
+				 esp->dma);
+				free_irq(esp->irq, esp_intr);
+				esp_deallocate(esp);
+				scsi_unregister(esp->ehost);
+				return 0;
+			}
+
+			request_region(tmp_io_addr, 32, "NCR 53c9x SCSI");
+
+			/*
+			 * 86C01 handles DMA, IO mode, from address
+			 *  (base + 0x0a)
+			 */
+
+			mca_disable_dma(esp->dma);
+			mca_set_dma_io(esp->dma, tmp_io_addr + 0x0a);
+			mca_enable_dma(esp->dma);
+ 
+			/* Tell the 86C01 to give us interrupts */
+
+			tmp_byte = inb(tmp_io_addr + 0x02) | 0x40;
+			outb(tmp_byte, tmp_io_addr + 0x02); 
+
+			/*
+			 * Scsi ID -- general purpose register, hi
+			 *  2 bits; add 4 to this number to get the
+			 *  ID
+			 */
+
+			esp->scsi_id = ((pos[2] & 0xC0) >> 6) + 4;
+
+			/* Do command transfer with programmed I/O */
+
+			esp->do_pio_cmds = 1;
+
+			/* Required functions */
+
+			esp->dma_bytes_sent = &dma_bytes_sent;
+			esp->dma_can_transfer = &dma_can_transfer;
+			esp->dma_dump_state = &dma_dump_state;
+			esp->dma_init_read = &dma_init_read;
+			esp->dma_init_write = &dma_init_write;
+			esp->dma_ints_off = &dma_ints_off;
+			esp->dma_ints_on = &dma_ints_on;
+			esp->dma_irq_p = &dma_irq_p;
+			esp->dma_ports_p = &dma_ports_p;
+			esp->dma_setup = &dma_setup;
+
+			/* Optional functions */
+
+			esp->dma_barrier = NULL;
+			esp->dma_drain = NULL;
+			esp->dma_invalidate = NULL;
+			esp->dma_irq_entry = NULL;
+			esp->dma_irq_exit = NULL;
+			esp->dma_led_on = dma_led_on;
+			esp->dma_led_off = dma_led_off;
+			esp->dma_poll = NULL;
+			esp->dma_reset = NULL;
+
+			/* Set the command buffer */
+
+			esp->esp_command = (volatile unsigned char*)
+			  cmd_buffer;
+	 		esp->esp_command_dvma = isa_virt_to_bus(cmd_buffer);
+
+			/* SCSI chip speed */
+
+			esp->cfreq = 25000000;
+
+			/* Differential SCSI? I think not. */
+
+			esp->diff = 0;
+
+			esp_initialize(esp);
+
+      			printk(" Adapter found in slot %2d: io port 0x%x "
+			  "irq %d dma channel %d\n", slot + 1, tmp_io_addr,
+			   esp->irq, esp->dma);
+
+			mca_set_adapter_name(slot, "NCR 53C9X SCSI Adapter");
+			mca_mark_as_used(slot);
+
+			break;
+		}
+    
+		id_to_check++;
+	}
+
+	return esps_in_use;
+}
+
+
+/******************************************************************* Release */
+
+static int mca_esp_release(struct Scsi_Host *host)
+{
+	struct NCR_ESP *esp = (struct NCR_ESP *)host->hostdata;
+	unsigned char tmp_byte;
+
+	esp_deallocate(esp);
+	/*
+	 * Tell the 86C01 to stop sending interrupts
+	 */
+
+	tmp_byte = inb(esp->eregs->io_addr - 0x0E);
+	tmp_byte &= ~0x40;
+	outb(tmp_byte, esp->eregs->io_addr - 0x0E);
+
+	free_irq(esp->irq, esp_intr);
+	free_dma(esp->dma);
+
+	mca_mark_as_unused(esp->slot);
+
+	return 0;
+}
+
+/************************************************************* DMA Functions */
+static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
+{
+	/* Ask the 53c9x.  It knows. */
+
+	return fifo_count;
+}
+
+static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	/* 
+	 * The MCA dma channels can only do up to 128K bytes at a time.
+         *  (16 bit mode)
+	 */
+
+	unsigned long sz = sp->SCp.this_residual;
+	if(sz > 0x20000)
+		sz = 0x20000;
+	return sz;
+}
+
+static void dma_dump_state(struct NCR_ESP *esp)
+{
+	/*
+	 * Doesn't quite match up to the other drivers, but we do what we
+	 *  can.
+	 */
+
+	ESPLOG(("esp%d: dma channel <%d>\n", esp->esp_id, esp->dma));
+	ESPLOG(("bytes left to dma: %d\n", mca_get_dma_residue(esp->dma)));
+}
+
+static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
+{
+	unsigned long flags;
+
+
+	save_flags(flags);
+	cli();
+
+	mca_disable_dma(esp->dma);
+	mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_16 |
+	  MCA_DMA_MODE_IO);
+	mca_set_dma_addr(esp->dma, addr);
+	mca_set_dma_count(esp->dma, length / 2); /* !!! */
+	mca_enable_dma(esp->dma);
+
+	restore_flags(flags);
+}
+
+static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
+{
+	unsigned long flags;
+
+
+	save_flags(flags);
+	cli();
+
+	mca_disable_dma(esp->dma);
+	mca_set_dma_mode(esp->dma, MCA_DMA_MODE_XFER | MCA_DMA_MODE_WRITE |
+	  MCA_DMA_MODE_16 | MCA_DMA_MODE_IO);
+	mca_set_dma_addr(esp->dma, addr);
+	mca_set_dma_count(esp->dma, length / 2); /* !!! */
+	mca_enable_dma(esp->dma);
+
+	restore_flags(flags);
+}
+
+static void dma_ints_off(struct NCR_ESP *esp)
+{
+	/*
+	 * Tell the 'C01 to shut up.  All interrupts are routed through it.
+	 */
+
+	outb(inb(esp->eregs->io_addr - 0x0E) & ~0x40,
+	 esp->eregs->io_addr - 0x0E);
+}
+
+static void dma_ints_on(struct NCR_ESP *esp)
+{
+	/*
+	 * Ok.  You can speak again.
+	 */
+
+	outb(inb(esp->eregs->io_addr - 0x0E) | 0x40,
+	 esp->eregs->io_addr - 0x0E);
+}
+
+static int dma_irq_p(struct NCR_ESP *esp)
+{
+	/*
+	 * DaveM says that this should return a "yes" if there is an interrupt
+	 *  or a DMA error occurred.  I copied the Amiga driver's semantics,
+	 *  though, because it seems to work and we can't really tell if
+	 *  a DMA error happened.  This gives the "yes" if the scsi chip
+	 *  is sending an interrupt and no DMA activity is taking place
+	 */
+
+	return (!(inb(esp->eregs->io_addr - 0x04) & 1) &&
+	 !(inb(esp->eregs->io_addr - 0x04) & 2) ); 
+}
+
+static int dma_ports_p(struct NCR_ESP *esp)
+{
+	/*
+	 * Check to see if interrupts are enabled on the 'C01 (in case abort
+	 *  is entered multiple times, so we only do the abort once)
+	 */
+
+	return (inb(esp->eregs->io_addr - 0x0E) & 0x40) ? 1:0;
+}
+
+static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
+{
+	if(write){
+		dma_init_write(esp, addr, count);
+	} else {
+		dma_init_read(esp, addr, count);
+	}
+}
+
+/*
+ * These will not play nicely with other disk controllers that try to use the
+ *  disk active LED... but what can you do?  Don't answer that.
+ *
+ * Stolen shamelessly from ibmmca.c -- IBM Microchannel SCSI adapter driver
+ *
+ */
+
+static void dma_led_on(struct NCR_ESP *esp)
+{
+	outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR);
+}
+
+static void dma_led_off(struct NCR_ESP *esp)
+{
+	outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR);
+}
+
+static Scsi_Host_Template driver_template = {
+	.proc_name		= "mca_53c9x",
+	.name			= "NCR 53c9x SCSI",
+	.detect			= mca_esp_detect,
+	.slave_alloc		= esp_slave_alloc,
+	.slave_destroy		= esp_slave_destroy,
+	.release		= mca_esp_release,
+	.queuecommand		= esp_queue,
+	.eh_abort_handler	= esp_abort,
+	.eh_bus_reset_handler	= esp_reset,
+	.can_queue		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 1,
+	.unchecked_isa_dma	= 1,
+	.use_clustering		= DISABLE_CLUSTERING
+};
+
+
+#include "scsi_module.c"
+
+/*
+ * OK, here's the goods I promised.  The NCR 86C01 is an MCA interface chip 
+ *  that handles enabling/diabling IRQ, dma interfacing, IO port selection
+ *  and other fun stuff.  It takes up 16 addresses, and the chip it is
+ *  connnected to gets the following 16.  Registers are as follows:
+ *
+ * Offsets 0-1 : Card ID
+ *
+ * Offset    2 : Mode enable register --
+ *                Bit    7 : Data Word width (1 = 16, 0 = 8)
+ *		  Bit    6 : IRQ enable (1 = enabled)
+ *                Bits 5,4 : IRQ select
+ *                              0  0 : IRQ 3
+ *			        0  1 : IRQ 5
+ * 				1  0 : IRQ 7
+ *  				1  1 : IRQ 9
+ *                Bits 3-1 : Base Address
+ *                           0  0  0 : <disabled>
+ * 			     0  0  1 : 0x0240
+ *    			     0  1  0 : 0x0340
+ *     			     0  1  1 : 0x0400
+ * 			     1  0  0 : 0x0420
+ * 			     1  0  1 : 0x3240
+ * 			     1  1  0 : 0x8240
+ * 			     1  1  1 : 0xA240
+ *		  Bit    0 : Card enable (1 = enabled)
+ *
+ * Offset    3 : DMA control register --
+ *                Bit    7 : DMA enable (1 = enabled)
+ *                Bits 6,5 : Preemt Count Select (transfers to complete after
+ *                            'C01 has been preempted on MCA bus)
+ *                              0  0 : 0
+ *                              0  1 : 1
+ *                              1  0 : 3
+ *                              1  1 : 7
+ *  (all these wacky numbers; I'm sure there's a reason somewhere)
+ *                Bit    4 : Fairness enable (1 = fair bus priority)
+ *                Bits 3-0 : Arbitration level (0-15 consecutive)
+ * 
+ * Offset    4 : General purpose register
+ *                Bits 7-3 : User definable (here, 7,6 are SCSI ID)
+ *                Bits 2-0 : reserved
+ *
+ * Offset   10 : DMA decode register (used for IO based DMA; also can do
+ *                PIO through this port)
+ *
+ * Offset   12 : Status
+ *                Bits 7-2 : reserved
+ *                Bit    1 : DMA pending (1 = pending)
+ *                Bit    0 : IRQ pending (0 = pending)
+ *
+ * Exciting, huh?  
+ *
+ */