floppy.h

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/* $Id: floppy.h,v 1.28 2000/02/18 13:50:54 davem Exp $
 * asm-sparc64/floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1996 David S. Miller ([e-mail])
 * Copyright (C) 1997 Jakub Jelinek ([e-mail])
 *
 * Ultra/PCI support added: Sep 1997  Eddie C. Dost  ([e-mail])
 */

#ifndef __ASM_SPARC64_FLOPPY_H
#define __ASM_SPARC64_FLOPPY_H

#include <linux/config.h>
#include <linux/init.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/idprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/sbus.h>
#include <asm/irq.h>


/*
 * Define this to enable exchanging drive 0 and 1 if only drive 1 is
 * probed on PCI machines.
 */
#undef PCI_FDC_SWAP_DRIVES


/* References:
 * 1) Netbsd Sun floppy driver.
 * 2) NCR 82077 controller manual
 * 3) Intel 82077 controller manual
 */
struct sun_flpy_controller {
	volatile unsigned char status1_82077; /* Auxiliary Status reg. 1 */
	volatile unsigned char status2_82077; /* Auxiliary Status reg. 2 */
	volatile unsigned char dor_82077;     /* Digital Output reg. */
	volatile unsigned char tapectl_82077; /* 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 an Ultra anyways. */
static struct sun_flpy_controller *sun_fdc = (struct sun_flpy_controller *)-1;
unsigned long fdc_status;
static struct sbus_dev *floppy_sdev = NULL;

struct sun_floppy_ops {
	unsigned char	(*fd_inb) (unsigned long port);
	void		(*fd_outb) (unsigned char value, unsigned long port);
	void		(*fd_enable_dma) (void);
	void		(*fd_disable_dma) (void);
	void		(*fd_set_dma_mode) (int);
	void		(*fd_set_dma_addr) (char *);
	void		(*fd_set_dma_count) (int);
	unsigned int	(*get_dma_residue) (void);
	void		(*fd_enable_irq) (void);
	void		(*fd_disable_irq) (void);
	int		(*fd_request_irq) (void);
	void		(*fd_free_irq) (void);
	int		(*fd_eject) (int);
};

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_fdops.fd_enable_dma()
#define fd_disable_dma()          sun_fdops.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_fdops.fd_set_dma_mode(mode)
#define fd_set_dma_addr(addr)     sun_fdops.fd_set_dma_addr(addr)
#define fd_set_dma_count(count)   sun_fdops.fd_set_dma_count(count)
#define get_dma_residue(x)        sun_fdops.get_dma_residue()
#define fd_enable_irq()           sun_fdops.fd_enable_irq()
#define fd_disable_irq()          sun_fdops.fd_disable_irq()
#define fd_cacheflush(addr, size) /* nothing... */
#define fd_request_irq()          sun_fdops.fd_request_irq()
#define fd_free_irq()             sun_fdops.fd_free_irq()
#define fd_eject(drive)           sun_fdops.fd_eject(drive)

static int FLOPPY_MOTOR_MASK = 0x10;

/* Super paranoid... */
#undef HAVE_DISABLE_HLT

static int sun_floppy_types[2] = { 0, 0 };

/* 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 FLOPPY0_TYPE		sun_floppy_init()
#define FLOPPY1_TYPE		sun_floppy_types[1]

#define FDC1			((unsigned long)sun_fdc)
static int FDC2 =		-1;

#define N_FDC    1
#define N_DRIVE  8

/* No 64k boundary crossing problems on the Sparc. */
#define CROSS_64KB(a,s) (0)

static unsigned char sun_82077_fd_inb(unsigned long port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to read unknown port %lx\n", port);
		panic("floppy: Port bolixed.");
	case 4: /* FD_STATUS */
		return sbus_readb(&sun_fdc->status_82077) & ~STATUS_DMA;
	case 5: /* FD_DATA */
		return sbus_readb(&sun_fdc->data_82077);
	case 7: /* FD_DIR */
		/* XXX: Is DCL on 0x80 in sun4m? */
		return sbus_readb(&sun_fdc->dir_82077);
	};
	panic("sun_82072_fd_inb: How did I get here?");
}

static void sun_82077_fd_outb(unsigned char value, unsigned long port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to write to unknown port %lx\n", port);
		panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
		/* Happily, the 82077 has a real DOR register. */
		sbus_writeb(value, &sun_fdc->dor_82077);
		break;
	case 5: /* FD_DATA */
		sbus_writeb(value, &sun_fdc->data_82077);
		break;
	case 7: /* FD_DCR */
		sbus_writeb(value, &sun_fdc->dcr_82077);
		break;
	case 4: /* FD_STATUS */
		sbus_writeb(value, &sun_fdc->status_82077);
		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;
unsigned long pdma_size;
volatile int doing_pdma = 0;

/* This is software state */
char *pdma_base = 0;
unsigned long pdma_areasize;

/* Common routines to all controller types on the Sparc. */
static __inline__ void virtual_dma_init(void)
{
	/* nothing... */
}

static void sun_fd_disable_dma(void)
{
	doing_pdma = 0;
	if (pdma_base) {
		mmu_unlockarea(pdma_base, pdma_areasize);
		pdma_base = 0;
	}
}

static 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 void sun_fd_set_dma_addr(char *buffer)
{
	pdma_vaddr = buffer;
}

static void sun_fd_set_dma_count(int length)
{
	pdma_size = length;
}

static void sun_fd_enable_dma(void)
{
	pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
	pdma_base = pdma_vaddr;
	pdma_areasize = pdma_size;
}

/* Our low-level entry point in arch/sparc/kernel/entry.S */
extern void floppy_hardint(int irq, void *unused, 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", NULL);

		return ((error == 0) ? 0 : -1);
	}
	return 0;
}

static void sun_fd_enable_irq(void)
{
}

static void sun_fd_disable_irq(void)
{
}

static void sun_fd_free_irq(void)
{
}

static unsigned int sun_get_dma_residue(void)
{
	/* XXX This isn't really correct. XXX */
	return 0;
}

static int sun_fd_eject(int drive)
{
	set_dor(0x00, 0xff, 0x90);
	udelay(500);
	set_dor(0x00, 0x6f, 0x00);
	udelay(500);
	return 0;
}

#ifdef CONFIG_PCI
#include <asm/ebus.h>
#include <asm/ns87303.h>

static struct linux_ebus_dma *sun_pci_fd_ebus_dma;
static struct pci_dev *sun_pci_ebus_dev;
static int sun_pci_broken_drive = -1;
static unsigned int sun_pci_dma_addr = -1U;
static int sun_pci_dma_len, sun_pci_dma_direction;

extern void floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);

static unsigned char sun_pci_fd_inb(unsigned long port)
{
	udelay(5);
	return inb(port);
}

static void sun_pci_fd_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	outb(val, port);
}

static void sun_pci_fd_broken_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	/*
	 * XXX: Due to SUN's broken floppy connector on AX and AXi
	 *      we need to turn on MOTOR_0 also, if the floppy is
	 *      jumpered to DS1 (like most PC floppies are). I hope
	 *      this does not hurt correct hardware like the AXmp.
	 *      (Eddie, Sep 12 1998).
	 */
	if (port == ((unsigned long)sun_fdc) + 2) {
		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x20)) {
			val |= 0x10;
		}
	}
	outb(val, port);
}

#ifdef PCI_FDC_SWAP_DRIVES
static void sun_pci_fd_lde_broken_outb(unsigned char val, unsigned long port)
{
	udelay(5);
	/*
	 * XXX: Due to SUN's broken floppy connector on AX and AXi
	 *      we need to turn on MOTOR_0 also, if the floppy is
	 *      jumpered to DS1 (like most PC floppies are). I hope
	 *      this does not hurt correct hardware like the AXmp.
	 *      (Eddie, Sep 12 1998).
	 */
	if (port == ((unsigned long)sun_fdc) + 2) {
		if (((val & 0x03) == sun_pci_broken_drive) && (val & 0x10)) {
			val &= ~(0x03);
			val |= 0x21;
		}
	}
	outb(val, port);
}
#endif /* PCI_FDC_SWAP_DRIVES */

static void sun_pci_fd_reset_dma(void)
{
	unsigned int dcsr;

	writel(EBUS_DCSR_RESET, &sun_pci_fd_ebus_dma->dcsr);
	udelay(1);
	dcsr = EBUS_DCSR_BURST_SZ_16 | EBUS_DCSR_TCI_DIS |
	       EBUS_DCSR_EN_CNT;
	writel(dcsr, (unsigned long)&sun_pci_fd_ebus_dma->dcsr);
}

static void sun_pci_fd_enable_dma(void)
{
	unsigned int dcsr;

	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
	dcsr |= EBUS_DCSR_EN_DMA;
	writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
}

static void sun_pci_fd_disable_dma(void)
{
	unsigned int dcsr;

	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
	if (dcsr & EBUS_DCSR_EN_DMA) {
		while (dcsr & EBUS_DCSR_DRAIN) {
			udelay(1);
			dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
		}
		dcsr &= ~(EBUS_DCSR_EN_DMA);
		writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
		if (dcsr & EBUS_DCSR_ERR_PEND) {
			sun_pci_fd_reset_dma();
			dcsr &= ~(EBUS_DCSR_ERR_PEND);
			writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);
		}
	}
	if (sun_pci_dma_addr != -1U)
		pci_unmap_single(sun_pci_ebus_dev,
				 sun_pci_dma_addr,
				 sun_pci_dma_len,
				 sun_pci_dma_direction);
	sun_pci_dma_addr = -1U;
}

static void sun_pci_fd_set_dma_mode(int mode)
{
	unsigned int dcsr;

	dcsr = readl(&sun_pci_fd_ebus_dma->dcsr);
	if (readl(&sun_pci_fd_ebus_dma->dbcr)) {
		sun_pci_fd_reset_dma();
		writel(dcsr, &sun_pci_fd_ebus_dma->dcsr);