- 根目录:
- arch
- sparc
- include
- asm
- floppy_64.h
/* 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(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_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)
/* 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) {
/* read */
*vaddr++ = readb(stat + 1);
} else {
unsigned char data = *vaddr++;
/* write */
writeb(data, stat + 1);
}
size--;
}
pdma_vaddr = vaddr;
pdma_size = size;
/* Send Terminal Count pulse to floppy controller. */
val = readb(auxio_register);
val |= AUXIO_AUX1_FTCNT;
writeb(val, auxio_register);
val &= ~AUXIO_AUX1_FTCNT;
writeb(val, auxio_register);
doing_pdma = 0;
}
main_interrupt:
return floppy_interrupt(irq, dev_cookie);
}
static int sun_fd_request_irq(void)
{
static int once = 0;
int error;
if(!once) {
once = 1;
error = request_irq(FLOPPY_IRQ, sparc_floppy_irq,
0, "floppy", NULL);
return ((error == 0) ? 0 : -1);
}
return 0;
}
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;
}
#include <asm/ebus_dma.h>
#include <asm/ns87303.h>
static struct ebus_dma_info sun_pci_fd_ebus_dma;
static struct device *sun_floppy_dev;
static int sun_pci_broken_drive = -1;
struct sun_pci_dma_op {
unsigned int addr;
int len;
int direction;
char *buf;
};
static struct sun_pci_dma_op sun_pci_dma_current = { -1U, 0, 0, NULL};
static struct sun_pci_dma_op sun_pci_dma_pending = { -1U, 0, 0, NULL};
irqreturn_t floppy_interrupt(int irq, void *dev_id);
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_enable_dma(void)
{
BUG_ON((NULL == sun_pci_dma_pending.buf) ||
(0 == sun_pci_dma_pending.len) ||
(0 == sun_pci_dma_pending.direction));
sun_pci_dma_current.buf = sun_pci_dma_pending.buf;
sun_pci_dma_current.len = sun_pci_dma_pending.len;
sun_pci_dma_current.direction = sun_pci_dma_pending.direction;
sun_pci_dma_pending.buf = NULL;
sun_pci_dma_pending.len = 0;
sun_pci_dma_pending.direction = 0;
sun_pci_dma_pending.addr = -1U;
sun_pci_dma_current.addr =
dma_map_single(sun_floppy_dev,
sun_pci_dma_current.buf,
sun_pci_dma_current.len,
sun_pci_dma_current.direction);
ebus_dma_enable(&sun_pci_fd_ebus_dma, 1);
if (ebus_dma_request(&sun_pci_fd_ebus_dma,
sun_pci_dma_current.addr,
sun_pci_dma_current.len))
BUG();
}
static void sun_pci_fd_disable_dma(void)
{
ebus_dma_enable(&sun_pci_fd_ebus_dma, 0);
if (sun_pci_dma_current.addr != -1U)
dma_unmap_single(sun_floppy_dev,
sun_pci_dma_current.addr,
sun_pci_dma_current.len,
sun_pci_dma_current.direction);
sun_pci_dma_current.addr = -1U;
}
static void sun_pci_fd_set_dma_mode(int mode)
{
if (mode == DMA_MODE_WRITE)
sun_pci_dma_pending.direction = DMA_TO_DEVICE;
else
sun_pci_dma_pending.direction = DMA_FROM_DEVICE;
ebus_dma_prepare(&sun_pci_fd_ebus_dma, mode != DMA_MODE_WRITE);
}
static void sun_pci_fd_set_dma_count(int length)
{
sun_pci_dma_pending.len = length;
}
static void sun_pci_fd_set_dma_addr(char *buffer)
{
sun_pci_dma_pending.buf = buffer;
}
static unsigned int sun_pci_get_dma_residue(void)
{
return ebus_dma_residue(&sun_pci_fd_ebus_dma);
}
static int sun_pci_fd_request_irq(void)
{
return ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 1);
}
static void sun_pci_fd_free_irq(void)
{
ebus_dma_irq_enable(&sun_pci_fd_ebus_dma, 0);
}
static int sun_pci_fd_eject(int drive)
{
return -EINVAL;
}
void sun_pci_fd_dma_callback(struct ebus_dma_info *p, int event, void *cookie)
{
floppy_interrupt(0, NULL);
}
/*
* Floppy probing, we'd like to use /dev/fd0 for a single Floppy on PCI,
* even if this is configured using DS1, thus looks like /dev/fd1 with
* the cabling used in Ultras.
*/
#define DOR (port + 2)
#define MSR (port + 4)
#define FIFO (port + 5)
static void sun_pci_fd_out_byte(unsigned long port, unsigned char val,
unsigned long reg)
{
unsigned char status;
int timeout = 1000;
while (!((status = inb(MSR)) & 0x80) && --timeout)
udelay(100);
outb(val, reg);
}
static unsigned char sun_pci_fd_sensei(unsigned long port)
{
unsigned char result[2] = { 0x70, 0x00 };
unsigned char status;
int i = 0;
sun_pci_fd_out_byte(port, 0x08, FIFO);
do {
int timeout = 1000;
while (!((status = inb(MSR)) & 0x80) && --timeout)
udelay(100);
if (!timeout)
break;
if ((status & 0xf0) == 0xd0)
result[i++] = inb(FIFO);
else
break;
} while (i < 2);
return result[0];
}
static void sun_pci_fd_reset(unsigned long port)
{
unsigned char mask = 0x00;
unsigned char status;
int timeout = 10000;
outb(0x80, MSR);
do {
status = sun_pci_fd_sensei(port);
if ((status & 0xc0) == 0xc0)
mask |= 1 << (status & 0x03);
else
udelay(100);
} while ((mask != 0x0f) && --timeout);
}
static int sun_pci_fd_test_drive(unsigned long port, int drive)
{
unsigned char status, data;
int timeout = 1000;
int ready;
sun_pci_fd_reset(port);
data = (0x10 << drive) | 0x0c | drive;
sun_pci_fd_out_byte(port, data, DOR);
sun_pci_fd_out_byte(port, 0x07, FIFO);
sun_pci_fd_out_byte(port, drive & 0x03, FIFO);
do {
udelay(100);
status = sun_pci_fd_sensei(port);
} while (((status & 0xc0) == 0x80) && --timeout);
if (!timeout)
ready = 0;
else
ready = (status & 0x10) ? 0 : 1;
sun_pci_fd_reset(port);
return ready;
}
#undef FIFO
#undef MSR
#undef DOR
static int __init ebus_fdthree_p(struct device_node *dp)
{
if (!strcmp(dp->name, "fdthree"))
return 1;
if (!strcmp(dp->name, "floppy")) {
const char *compat;
compat = of_get_property(dp, "compatible", NULL);
if (compat && !strcmp(compat, "fdthree"))
return 1;
}
return 0;
}
static unsigned long __init sun_floppy_init(void)
{
static int initialized = 0;
struct device_node *dp;
struct platform_device *op;
const char *prop;
char state[128];
if (initialized)
return sun_floppy_types[0];
initialized = 1;
op = NULL;
for_each_node_by_name(dp, "SUNW,fdtwo") {
if (strcmp(dp->parent->name, "sbus"))
continue;
op = of_find_device_by_node(dp);
if (op)
break;
}
if (op) {
floppy_op = op;
FLOPPY_IRQ = op->archdata.irqs[0];
} else {
struct device_node *ebus_dp;
void __iomem *auxio_reg;
const char *state_prop;
unsigned long config;
dp = NULL;
for_each_node_by_name(ebus_dp, "ebus") {
for (dp = ebus_dp->child; dp; dp = dp->sibling) {
if (ebus_fdthree_p(dp))
goto found_fdthree;
}
}
found_fdthree:
if (!dp)
return 0;
op = of_find_device_by_node(dp);
if (!op)
return 0;
state_prop = of_get_property(op->dev.of_node, "status", NULL);
if (state_prop && !strncmp(state_prop, "disabled", 8))
return 0;
FLOPPY_IRQ = op->archdata.irqs[0];
/* Make sure the high density bit is set, some systems
* (most notably Ultra5/Ultra10) come up with it clear.
*/
auxio_reg = (void __iomem *) op->resource[2].start;
writel(readl(auxio_reg)|0x2, auxio_reg);
sun_floppy_dev = &op->dev;
spin_lock_init(&sun_pci_fd_ebus_dma.lock);
/* XXX ioremap */
sun_pci_fd_ebus_dma.regs = (void __iomem *)
op->resource[1].start;
if (!sun_pci_fd_ebus_dma.regs)
return 0;
sun_pci_fd_ebus_dma.flags = (EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
EBUS_DMA_FLAG_TCI_DISABLE);
sun_pci_fd_ebus_dma.callback = sun_pci_fd_dma_callback;
sun_pci_fd_ebus_dma.client_cookie = NULL;
sun_pci_fd_ebus_dma.irq = FLOPPY_IRQ;
strcpy(sun_pci_fd_ebus_dma.name, "floppy");
if (ebus_dma_register(&sun_pci_fd_ebus_dma))
return 0;
/* XXX ioremap */
sun_fdc = (struct sun_flpy_controller *) op->resource[0].start;
sun_fdops.fd_inb = sun_pci_fd_inb;
sun_fdops.fd_outb = sun_pci_fd_outb;
can_use_virtual_dma = use_virtual_dma = 0;
sun_fdops.fd_enable_dma = sun_pci_fd_enable_dma;
sun_fdops.fd_disable_dma = sun_pci_fd_disable_dma;
sun_fdops.fd_set_dma_mode = sun_pci_fd_set_dma_mode;
sun_fdops.fd_set_dma_addr = sun_pci_fd_set_dma_addr;
sun_fdops.fd_set_dma_count = sun_pci_fd_set_dma_count;
sun_fdops.get_dma_residue = sun_pci_get_dma_residue;
sun_fdops.fd_request_irq = sun_pci_fd_request_irq;
sun_fdops.fd_free_irq = sun_pci_fd_free_irq;
sun_fdops.fd_eject = sun_pci_fd_eject;
fdc_status = (unsigned long) &sun_fdc->status_82077;
/*
* XXX: Find out on which machines this is really needed.
*/
if (1) {
sun_pci_broken_drive = 1;
sun_fdops.fd_outb = sun_pci_fd_broken_outb;
}
allowed_drive_mask = 0;
if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 0))
sun_floppy_types[0] = 4;
if (sun_pci_fd_test_drive((unsigned long)sun_fdc, 1))
sun_floppy_types[1] = 4;
/*
* Find NS87303 SuperIO config registers (through ecpp).
*/
config = 0;
for (dp = ebus_dp->child; dp; dp = dp->sibling) {
if (!strcmp(dp->name, "ecpp")) {
struct platform_device *ecpp_op;
ecpp_op = of_find_device_by_node(dp);
if (ecpp_op)
config = ecpp_op->resource[1].start;
goto config_done;
}
}
config_done:
/*
* Sanity check, is this really the NS87303?
*/
switch (config & 0x3ff) {
case 0x02e:
case 0x15c:
case 0x26e:
case 0x398:
break;
default:
config = 0;
}
if (!config)
return sun_floppy_types[0];
/* Enable PC-AT mode. */
ns87303_modify(config, ASC, 0, 0xc0);
#ifdef PCI_FDC_SWAP_DRIVES
/*
* If only Floppy 1 is present, swap drives.
*/
if (!sun_floppy_types[0] && sun_floppy_types[1]) {
/*
* Set the drive exchange bit in FCR on NS87303,
* make sure other bits are sane before doing so.
*/
ns87303_modify(config, FER, FER_EDM, 0);
ns87303_modify(config, ASC, ASC_DRV2_SEL, 0);
ns87303_modify(config, FCR, 0, FCR_LDE);
config = sun_floppy_types[0];
sun_floppy_types[0] = sun_floppy_types[1];
sun_floppy_types[1] = config;
if (sun_pci_broken_drive != -1) {
sun_pci_broken_drive = 1 - sun_pci_broken_drive;
sun_fdops.fd_outb = sun_pci_fd_lde_broken_outb;
}
}
#endif /* PCI_FDC_SWAP_DRIVES */
return sun_floppy_types[0];
}
prop = of_get_property(op->dev.of_node, "status", NULL);
if (prop && !strncmp(state, "disabled", 8))
return 0;
/*
* We cannot do of_ioremap here: it does request_region,
* which the generic floppy driver tries to do once again.
* But we must use the sdev resource values as they have
* had parent ranges applied.
*/
sun_fdc = (struct sun_flpy_controller *)
(op->resource[0].start +
((op->resource[0].flags & 0x1ffUL) << 32UL));
/* Last minute sanity check... */
if (sbus_readb(&sun_fdc->status1_82077) == 0xff) {
sun_fdc = (struct sun_flpy_controller *)-1;
return 0;
}
sun_fdops.fd_inb = sun_82077_fd_inb;
sun_fdops.fd_outb = sun_82077_fd_outb;
can_use_virtual_dma = use_virtual_dma = 1;
sun_fdops.fd_enable_dma = sun_fd_enable_dma;
sun_fdops.fd_disable_dma = sun_fd_disable_dma;
sun_fdops.fd_set_dma_mode = sun_fd_set_dma_mode;
sun_fdops.fd_set_dma_addr = sun_fd_set_dma_addr;
sun_fdops.fd_set_dma_count = sun_fd_set_dma_count;
sun_fdops.get_dma_residue = sun_get_dma_residue;
sun_fdops.fd_request_irq = sun_fd_request_irq;
sun_fdops.fd_free_irq = sun_fd_free_irq;
sun_fdops.fd_eject = sun_fd_eject;
fdc_status = (unsigned long) &sun_fdc->status_82077;
/* Success... */
allowed_drive_mask = 0x01;
sun_floppy_types[0] = 4;
sun_floppy_types[1] = 0;
return sun_floppy_types[0];
}
#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_SPARC64_FLOPPY_H) */