patch-1.3.44 linux/include/asm-sparc/floppy.h

• Lines: 358
• Date: Sat Nov 25 04:31:46 1995
• Orig file: v1.3.43/linux/include/asm-sparc/floppy.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.43/linux/include/asm-sparc/floppy.h linux/include/asm-sparc/floppy.h
@@ -0,0 +1,357 @@
+/* $Id: floppy.h,v 1.8 1995/11/25 02:31:45 davem Exp $
+ * asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef __ASM_SPARC_FLOPPY_H
+#define __ASM_SPARC_FLOPPY_H
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/idprom.h>
+#include <asm/machines.h>
+#include <asm/oplib.h>
+#include <asm/auxio.h>
+#include <asm/irq.h>
+
+/* References:
+ * 1) Netbsd Sun floppy driver.
+ * 2) NCR 82077 controller manual
+ * 3) Intel 82077 controller manual
+ */
+struct sun_flpy_controller {
+	volatile unsigned char status_82072;  /* Main Status reg. */
+#define dcr_82072              status_82072   /* Digital Control reg. */
+#define status1_82077          status_82072   /* Auxiliary Status reg. 1 */
+
+	volatile unsigned char data_82072;    /* Data fifo. */
+#define status2_82077          data_82072     /* Auxiliary Status reg. 2 */
+
+	volatile unsigned char dor_82077;     /* Digital Output reg. */
+	volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
+
+	volatile unsigned char status_82077;  /* Main Status Register. */
+#define drs_82077              status_82077   /* Digital Rate Select reg. */
+
+	volatile unsigned char data_82077;    /* Data fifo. */
+	volatile unsigned char ___unused;
+	volatile unsigned char dir_82077;     /* Digital Input reg. */
+#define dcr_82077              dir_82077      /* Config Control reg. */
+};
+
+/* You'll only ever find one controller on a SparcStation anyways. */
+static struct sun_flpy_controller *sun_fdc = NULL;
+volatile unsigned char *fdc_status;
+
+struct sun_floppy_ops {
+	unsigned char (*fd_inb)(int port);
+	void (*fd_outb)(unsigned char value, int port);
+};
+
+static struct sun_floppy_ops sun_fdops;
+
+#define fd_inb(port)              sun_fdops.fd_inb(port)
+#define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
+#define fd_enable_dma()           sun_fd_enable_dma()
+#define fd_disable_dma()          sun_fd_disable_dma()
+#define fd_request_dma()          (0) /* nothing... */
+#define fd_free_dma()             /* nothing... */
+#define fd_clear_dma_ff()         /* nothing... */
+#define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
+#define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
+#define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
+#define fd_enable_irq()           /* nothing... */
+#define fd_disable_irq()          /* nothing... */
+#define fd_cacheflush(addr, size) /* nothing... */
+#define fd_request_irq()          sun_fd_request_irq()
+#define fd_free_irq()             /* nothing... */
+
+/* It's all the same... */
+#define virt_to_bus(x)            (x)
+#define bus_to_virt(x)            (x)
+
+/* XXX This isn't really correct. XXX */
+#define get_dma_residue(x)        (0)
+
+#define FLOPPY0_TYPE  4
+#define FLOPPY1_TYPE  0
+
+/* Super paranoid... */
+#undef HAVE_DISABLE_HLT
+
+/* Here is where we catch the floppy driver trying to initialize,
+ * therefore this is where we call the PROM device tree probing
+ * routine etc. on the Sparc.
+ */
+#define FDC1                      sun_floppy_init()
+
+static int FDC2=-1;
+
+#define N_FDC    1
+#define N_DRIVE  8
+
+/* No 64k boundry crossing problems on the Sparc. */
+#define CROSS_64KB(a,s) (0)
+
+/* Routines unique to each controller type on a Sun. */
+static unsigned char sun_82072_fd_inb(int port)
+{
+	switch(port & 7) {
+	default:
+		printk("floppy: Asked to read unknown port %d\n", port);
+		panic("floppy: Port bolixed.");
+	case 4: /* FD_STATUS */
+		return sun_fdc->status_82072 & ~STATUS_DMA;
+	case 5: /* FD_DATA */
+		return sun_fdc->data_82072;
+	case 7: /* FD_DIR */
+		/* Always return 0, the disk never changes
+		 * without the kernel explicitly doing so.
+		 */
+		return 0;
+	};
+	panic("sun_82072_fd_inb: How did I get here?");
+}
+
+static void sun_82072_fd_outb(unsigned char value, int port)
+{
+	switch(port & 7) {
+	default:
+		printk("floppy: Asked to write to unknown port %d\n", port);
+		panic("floppy: Port bolixed.");
+	case 2: /* FD_DOR */
+		/* Oh geese, 82072 on the Sun has no DOR register,
+		 * the functionality is implemented via the AUXIO
+		 * I/O register.  So we must emulate the behavior.
+		 *
+		 * ASSUMPTIONS:  There will only ever be one floppy
+		 *               drive attached to a Sun controller
+		 *               and it will be at drive zero.
+		 */
+		if(value & 0xf0)
+			set_auxio(AUXIO_FLPY_DSEL, 0);
+#if 0
+		else
+			set_auxio(0, AUXIO_FLPY_DSEL);
+#endif
+		break;
+	case 5: /* FD_DATA */
+		sun_fdc->data_82072 = value;
+		break;
+	case 7: /* FD_DCR */
+		sun_fdc->dcr_82072 = value;
+		break;
+	case 4: /* FD_STATUS */
+		sun_fdc->status_82072 = value;
+		break;
+	};
+	return;
+}
+
+static unsigned char sun_82077_fd_inb(int port)
+{
+	switch(port & 7) {
+	default:
+		printk("floppy: Asked to read unknown port %d\n", port);
+		panic("floppy: Port bolixed.");
+	case 4: /* FD_STATUS */
+		return sun_fdc->status_82077 & ~STATUS_DMA;
+	case 5: /* FD_DATA */
+		return sun_fdc->data_82077;
+	case 7: /* FD_DIR */
+		/* Always return 0, the disk never changes
+		 * without the kernel explicitly ejecting it.
+		 */
+		return 0;
+	};
+	panic("sun_82072_fd_inb: How did I get here?");
+}
+
+static void sun_82077_fd_outb(unsigned char value, int port)
+{
+	switch(port & 7) {
+	default:
+		printk("floppy: Asked to write to unknown port %d\n", port);
+		panic("floppy: Port bolixed.");
+	case 2: /* FD_DOR */
+		/* Happily, the 82077 has a real DOR register. */
+		sun_fdc->dor_82077 = value;
+		break;
+	case 5: /* FD_DATA */
+		sun_fdc->data_82077 = value;
+		break;
+	case 7: /* FD_DCR */
+		sun_fdc->dcr_82077 = value;
+		break;
+	case 4: /* FD_STATUS */
+		sun_fdc->status_82077 = value;
+		break;
+	};
+	return;
+}
+
+/* For pseudo-dma (Sun floppy drives have no real DMA available to
+ * them so we must eat the data fifo bytes directly ourselves) we have
+ * three state variables.  doing_pdma tells our inline low-level
+ * assembly floppy interrupt entry point whether it should sit and eat
+ * bytes from the fifo or just transfer control up to the higher level
+ * floppy interrupt c-code.  I tried very hard but I could not get the
+ * pseudo-dma to work in c-code without getting many overruns and
+ * underruns.  If non-zero, doing_pdma encodes the direction of
+ * the transfer for debugging.  1=read 2=write
+ */
+char *pdma_vaddr;
+char *pdma_vsave;
+unsigned long pdma_size;
+int doing_pdma = 0;
+
+/* Common routines to all controller types on the Sparc. */
+static inline void virtual_dma_init(void)
+{
+	/* nothing... */
+}
+
+static inline void sun_fd_disable_dma(void)
+{
+	doing_pdma = 0;
+}
+
+static inline void sun_fd_set_dma_mode(int mode)
+{
+	switch(mode) {
+	case DMA_MODE_READ:
+		doing_pdma = 1;
+		break;
+	case DMA_MODE_WRITE:
+		doing_pdma = 2;
+		break;
+	default:
+		printk("Unknown dma mode %d\n", mode);
+		panic("floppy: Giving up...");
+	}
+}
+
+static inline void sun_fd_set_dma_addr(char *buffer)
+{
+	pdma_vaddr = buffer;
+}
+
+static inline void sun_fd_set_dma_count(int length)
+{
+	pdma_size = length;
+}
+
+static inline void sun_fd_enable_dma(void)
+{
+	/* We're about to let it rip, lock any tlb entries necessary. */
+	pdma_vaddr = pdma_vsave = mmu_lockarea(pdma_vaddr, pdma_size);
+}
+
+/* Our low-level entry point in arch/sparc/kernel/entry.S */
+extern void floppy_hardint(int irq, struct pt_regs *regs);
+
+static int sun_fd_request_irq(void)
+{
+	static int once = 0;
+	int error;
+
+	if(!once) {
+		once = 1;
+		error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");
+		return ((error == 0) ? 0 : -1);
+	} else return 0;
+}
+
+static struct linux_prom_registers fd_regs[2];
+
+static int sun_floppy_init(void)
+{
+	char state[128];
+	int tnode, fd_node, num_regs;
+
+	FLOPPY_IRQ = 11;
+	/* Forget it if we aren't on a machine that could possibly
+	 * ever have a floppy drive.
+	 */
+	if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
+	   ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
+	    (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
+		/* We certainly don't have a floppy controller. */
+		goto no_sun_fdc;
+	}
+	/* Well, try and find one. */
+	tnode = prom_getchild(prom_root_node);
+	fd_node = prom_searchsiblings(tnode, "obio");
+	if(fd_node != 0) {
+		tnode = prom_getchild(fd_node);
+		fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
+	} else {
+		fd_node = prom_searchsiblings(tnode, "fd");
+	}
+	if(fd_node == 0) {
+		goto no_sun_fdc;
+	}
+
+	/* The sun4m lets us know if the controller is actually usable. */
+	if(sparc_cpu_model == sun4m) {
+		prom_getproperty(fd_node, "status", state, sizeof(state));
+		if(!strcmp(state, "disabled")) {
+			goto no_sun_fdc;
+		}
+	}
+	num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
+	num_regs = (num_regs / sizeof(fd_regs[0]));
+	prom_apply_obio_ranges(fd_regs, num_regs);
+	sun_fdc = (struct sun_flpy_controller *) sparc_alloc_io(fd_regs[0].phys_addr,
+								0x0,
+								fd_regs[0].reg_size,
+								"floppy",
+								fd_regs[0].which_io,
+								0x0);
+	/* Last minute sanity check... */
+	if(sun_fdc->status_82072 == 0xff) {
+		sun_fdc = NULL;
+		goto no_sun_fdc;
+	}
+
+	/* We need the version as early as possible to set up the
+	 * function pointers correctly.  Assume 82077 for probing
+	 * purposes.
+	 */
+	sun_fdops.fd_inb = sun_82077_fd_inb;
+	sun_fdops.fd_outb = sun_82077_fd_outb;
+	fdc_status = &sun_fdc->status_82077;
+
+	/* This controller detection technique is from the netbsd
+	 * Sun floppy driver, origionally Chris Torek of BSDI came
+	 * up with this.  It seems to work pretty well.
+	 */
+	if(sun_fdc->dor_82077 == 0x80) {
+		sun_fdc->dor_82077 = 2;
+		if(sun_fdc->dor_82077 == 0x80) {
+			/* Ok, it's really an 82072. */
+			sun_fdops.fd_inb = sun_82072_fd_inb;
+			sun_fdops.fd_outb = sun_82072_fd_outb;
+			fdc_status = &sun_fdc->status_82072;
+		}
+	}
+
+	/* P3: The only realiable way which I found for ejection
+	 * of boot floppy. AUXIO_FLPY_EJCT is not enougth alone.
+	 */
+	set_auxio(AUXIO_FLPY_EJCT, 0);
+	udelay(1000);
+	set_auxio(AUXIO_FLPY_DSEL, AUXIO_FLPY_EJCT);
+	udelay(1000);
+	set_auxio(0, AUXIO_FLPY_DSEL);
+
+	/* Success... */
+	return (int) sun_fdc;
+
+no_sun_fdc:
+	return -1;
+}
+
+#endif /* !(__ASM_SPARC_FLOPPY_H) */