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/* SPDX-License-Identifier: GPL-2.0 */
/* asm/floppy.h: Sparc specific parts of the Floppy driver.
*
* Copyright (C) 1995 David S. Miller ([email protected])
*/
#ifndef __ASM_SPARC_FLOPPY_H
#define __ASM_SPARC_FLOPPY_H
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pgtable.h>
#include <asm/idprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/irq.h>
/* We don't need no stinkin' I/O port allocation crap. */
#undef release_region
#undef request_region
#define release_region(X, Y) do { } while(0)
#define request_region(X, Y, Z) (1)
/* 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;
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(base, reg) sun_fdops.fd_inb(reg)
#define fd_outb(value, base, reg) sun_fdops.fd_outb(value, reg)
#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_request_irq() sun_fd_request_irq()
#define fd_free_irq() /* nothing... */
#if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
#define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
#endif
/* 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()
#define N_FDC 1
#define N_DRIVE 8
/* No 64k boundary crossing problems on the Sparc. */
#define CROSS_64KB(a,s) (0)
/* Routines unique to each controller type on a Sun. */
static void sun_set_dor(unsigned char value, int fdc_82077)
{
if (fdc_82077)
sun_fdc->dor_82077 = value;
}
static unsigned char sun_read_dir(void)
{
return sun_fdc->dir_82077;
}
static unsigned char sun_82072_fd_inb(int port)
{
udelay(5);
switch (port) {
default:
printk("floppy: Asked to read unknown port %d\n", port);
panic("floppy: Port bolixed.");
case FD_STATUS:
return sun_fdc->status_82072 & ~STATUS_DMA;
case FD_DATA:
return sun_fdc->data_82072;
case FD_DIR:
return sun_read_dir();
}
panic("sun_82072_fd_inb: How did I get here?");
}
static void sun_82072_fd_outb(unsigned char value, int port)
{
udelay(5);
switch (port) {
default:
printk("floppy: Asked to write to unknown port %d\n", port);
panic("floppy: Port bolixed.");
case FD_DOR:
sun_set_dor(value, 0);
break;
case FD_DATA:
sun_fdc->data_82072 = value;
break;
case FD_DCR:
sun_fdc->dcr_82072 = value;
break;
case FD_DSR:
sun_fdc->status_82072 = value;
break;
}
return;
}
static unsigned char sun_82077_fd_inb(int port)
{
udelay(5);
switch (port) {
default:
printk("floppy: Asked to read unknown port %d\n", port);
panic("floppy: Port bolixed.");
case FD_SRA:
return sun_fdc->status1_82077;
case FD_SRB:
return sun_fdc->status2_82077;
case FD_DOR:
return sun_fdc->dor_82077;
case FD_TDR:
return sun_fdc->tapectl_82077;
case FD_STATUS:
return sun_fdc->status_82077 & ~STATUS_DMA;
case FD_DATA:
return sun_fdc->data_82077;
case FD_DIR:
return sun_read_dir();
}
panic("sun_82077_fd_inb: How did I get here?");
}
static void sun_82077_fd_outb(unsigned char value, int port)
{
udelay(5);
switch (port) {
default:
printk("floppy: Asked to write to unknown port %d\n", port);
panic("floppy: Port bolixed.");
case FD_DOR:
sun_set_dor(value, 1);
break;
case FD_DATA:
sun_fdc->data_82077 = value;
break;
case FD_DCR:
sun_fdc->dcr_82077 = value;
break;
case FD_DSR:
sun_fdc->status_82077 = value;
break;
case FD_TDR:
sun_fdc->tapectl_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
*/
/* 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;
pdma_base = NULL;
}
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)
{
pdma_base = pdma_vaddr;
pdma_areasize = pdma_size;
}
int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler);
static int sun_fd_request_irq(void)
{
static int once = 0;
if (!once) {
once = 1;
return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
} else {
return 0;
}
}
static struct linux_prom_registers fd_regs[2];
static int sun_floppy_init(void)
{
struct platform_device *op;
struct device_node *dp;
struct resource r;
char state[128];
phandle fd_node;
phandle tnode;
int num_regs;
use_virtual_dma = 1;
/* Forget it if we aren't on a machine that could possibly
* ever have a floppy drive.
*/
if (sparc_cpu_model != sun4m) {
/* We certainly don't have a floppy controller. */
goto no_sun_fdc;
}
/* Well, try to 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 (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
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);
memset(&r, 0, sizeof(r));
r.flags = fd_regs[0].which_io;
r.start = fd_regs[0].phys_addr;
sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
/* Look up irq in platform_device.
* We try "SUNW,fdtwo" and "fd"
*/
op = NULL;
for_each_node_by_name(dp, "SUNW,fdtwo") {
op = of_find_device_by_node(dp);
if (op)
break;
}
if (!op) {
for_each_node_by_name(dp, "fd") {
op = of_find_device_by_node(dp);
if (op)
break;
}
}
if (!op)
goto no_sun_fdc;
FLOPPY_IRQ = op->archdata.irqs[0];
/* Last minute sanity check... */
if (sun_fdc->status_82072 == 0xff) {
sun_fdc = NULL;
goto no_sun_fdc;
}
sun_fdops.fd_inb = sun_82077_fd_inb;
sun_fdops.fd_outb = sun_82077_fd_outb;
fdc_status = &sun_fdc->status_82077;
if (sun_fdc->dor_82077 == 0x80) {
sun_fdc->dor_82077 = 0x02;
if (sun_fdc->dor_82077 == 0x80) {
sun_fdops.fd_inb = sun_82072_fd_inb;
sun_fdops.fd_outb = sun_82072_fd_outb;
fdc_status = &sun_fdc->status_82072;
}
}
/* Success... */
allowed_drive_mask = 0x01;
return (int) sun_fdc;
no_sun_fdc:
return -1;
}
static int sparc_eject(void)
{
set_dor(0x00, 0xff, 0x90);
udelay(500);
set_dor(0x00, 0x6f, 0x00);
udelay(500);
return 0;
}
#define fd_eject(drive) sparc_eject()
#define EXTRA_FLOPPY_PARAMS
static DEFINE_SPINLOCK(dma_spin_lock);
#define claim_dma_lock() \
({ unsigned long flags; \
spin_lock_irqsave(&dma_spin_lock, flags); \
flags; \
})
#define release_dma_lock(__flags) \
spin_unlock_irqrestore(&dma_spin_lock, __flags);
#endif /* !(__ASM_SPARC_FLOPPY_H) */
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