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/* SPDX-License-Identifier: GPL-2.0 */
/* floppy.h: Sparc specific parts of the Floppy driver.
*
* Copyright (C) 1996, 2007, 2008 David S. Miller (davem@davemloft.net)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*
* Ultra/PCI support added: Sep 1997 Eddie C. Dost (ecd@skynet.be)
*/
#ifndef __ASM_SPARC64_FLOPPY_H
#define __ASM_SPARC64_FLOPPY_H
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/dma-mapping.h>
#include <asm/auxio.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 platform_device *floppy_op = 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);
int (*fd_request_irq) (void);
void (*fd_free_irq) (void);
int (*fd_eject) (int);
};
static struct sun_floppy_ops sun_fdops;
#define fd_inb(base, reg) sun_fdops.fd_inb((base) + (reg))
#define fd_outb(value, base, reg) sun_fdops.fd_outb(value, (base) + (reg))
#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_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)
/* 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)
#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
*/
unsigned char *pdma_vaddr;
unsigned long pdma_size;
volatile int doing_pdma = 0;
/* This is software state */
char *pdma_base = NULL;
unsigned long pdma_areasize;
/* Common routines to all controller types on the Sparc. */
static void sun_fd_disable_dma(void)
{
doing_pdma = 0;
pdma_base = NULL;
}
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_base = pdma_vaddr;
pdma_areasize = pdma_size;
}
irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie)
{
if (likely(doing_pdma)) {
void __iomem *stat = (void __iomem *) fdc_status;
unsigned char *vaddr = pdma_vaddr;
unsigned long size = pdma_size;
u8 val;
while (size) {
val = readb(stat);
if (unlikely(!(val & 0x80))) {
pdma_vaddr = vaddr;
pdma_size = size;
return IRQ_HANDLED;
}
if (unlikely(!(val & 0x20))) {
pdma_vaddr = vaddr;
pdma_size = size;
doing_pdma = 0;
goto main_interrupt;
}
if (val & 0x40) {
/* rea
|