forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
393 lines
9.6 KiB
393 lines
9.6 KiB
/* 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) */
|
|
|