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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc/floppy.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-sparc/floppy.h')
-rw-r--r-- | include/asm-sparc/floppy.h | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/include/asm-sparc/floppy.h b/include/asm-sparc/floppy.h new file mode 100644 index 000000000000..780ee7ff9dc3 --- /dev/null +++ b/include/asm-sparc/floppy.h @@ -0,0 +1,369 @@ +/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + */ + +#ifndef __ASM_SPARC_FLOPPY_H +#define __ASM_SPARC_FLOPPY_H + +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/system.h> +#include <asm/idprom.h> +#include <asm/machines.h> +#include <asm/oplib.h> +#include <asm/auxio.h> +#include <asm/irq.h> + +/* We don't need no stinkin' I/O port allocation crap. */ +#undef release_region +#undef check_region +#undef request_region +#define release_region(X, Y) do { } while(0) +#define check_region(X, Y) (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; +volatile unsigned char *fdc_status; + +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(port) sun_fdops.fd_inb(port) +#define fd_outb(value,port) sun_fdops.fd_outb(value,port) +#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_cacheflush(addr, size) /* 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 + +#define FLOPPY_MOTOR_MASK 0x10 + +/* 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 unsigned char sun_82072_fd_inb(int port) +{ + udelay(5); + switch(port & 7) { + default: + printk("floppy: Asked to read unknown port %d\n", port); + panic("floppy: Port bolixed."); + case 4: /* FD_STATUS */ + return sun_fdc->status_82072 & ~STATUS_DMA; + case 5: /* FD_DATA */ + return sun_fdc->data_82072; + case 7: /* FD_DIR */ + return (get_auxio() & AUXIO_FLPY_DCHG)? 0x80: 0; + }; + 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 & 7) { + default: + printk("floppy: Asked to write to unknown port %d\n", port); + panic("floppy: Port bolixed."); + case 2: /* FD_DOR */ + /* Oh geese, 82072 on the Sun has no DOR register, + * the functionality is implemented via the AUXIO + * I/O register. So we must emulate the behavior. + * + * ASSUMPTIONS: There will only ever be one floppy + * drive attached to a Sun controller + * and it will be at drive zero. + */ + { + unsigned bits = 0; + if (value & 0x10) bits |= AUXIO_FLPY_DSEL; + if ((value & 0x80) == 0) bits |= AUXIO_FLPY_EJCT; + set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT)); + } + break; + case 5: /* FD_DATA */ + sun_fdc->data_82072 = value; + break; + case 7: /* FD_DCR */ + sun_fdc->dcr_82072 = value; + break; + case 4: /* FD_STATUS */ + sun_fdc->status_82072 = value; + break; + }; + return; +} + +static unsigned char sun_82077_fd_inb(int port) +{ + udelay(5); + switch(port & 7) { + default: + printk("floppy: Asked to read unknown port %d\n", port); + panic("floppy: Port bolixed."); + case 4: /* FD_STATUS */ + return sun_fdc->status_82077 & ~STATUS_DMA; + case 5: /* FD_DATA */ + return sun_fdc->data_82077; + case 7: /* FD_DIR */ + /* XXX: Is DCL on 0x80 in sun4m? */ + return sun_fdc->dir_82077; + }; + panic("sun_82072_fd_inb: How did I get here?"); +} + +static void sun_82077_fd_outb(unsigned char value, int port) +{ + udelay(5); + switch(port & 7) { + default: + printk("floppy: Asked to write to unknown port %d\n", port); + panic("floppy: Port bolixed."); + case 2: /* FD_DOR */ + /* Happily, the 82077 has a real DOR register. */ + sun_fdc->dor_82077 = value; + break; + case 5: /* FD_DATA */ + sun_fdc->data_82077 = value; + break; + case 7: /* FD_DCR */ + sun_fdc->dcr_82077 = value; + break; + case 4: /* FD_STATUS */ + sun_fdc->status_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 + */ +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 __inline__ void virtual_dma_init(void) +{ + /* nothing... */ +} + +static __inline__ void sun_fd_disable_dma(void) +{ + doing_pdma = 0; + if (pdma_base) { + mmu_unlockarea(pdma_base, pdma_areasize); + pdma_base = 0; + } +} + +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_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 */ +irqreturn_t 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"); + return ((error == 0) ? 0 : -1); + } else return 0; +} + +static struct linux_prom_registers fd_regs[2]; + +static int sun_floppy_init(void) +{ + char state[128]; + int tnode, fd_node, num_regs; + struct resource r; + + use_virtual_dma = 1; + + FLOPPY_IRQ = 11; + /* Forget it if we aren't on a machine that could possibly + * ever have a floppy drive. + */ + if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) || + ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) || + (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) { + /* 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(sparc_cpu_model == sun4m && + 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 = (struct sun_flpy_controller *) + sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy"); + + /* Last minute sanity check... */ + if(sun_fdc->status_82072 == 0xff) { + sun_fdc = NULL; + goto no_sun_fdc; + } + + if(sparc_cpu_model == sun4c) { + sun_fdops.fd_inb = sun_82072_fd_inb; + sun_fdops.fd_outb = sun_82072_fd_outb; + fdc_status = &sun_fdc->status_82072; + /* printk("AUXIO @0x%lx\n", auxio_register); */ /* P3 */ + } else { + sun_fdops.fd_inb = sun_82077_fd_inb; + sun_fdops.fd_outb = sun_82077_fd_outb; + fdc_status = &sun_fdc->status_82077; + /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */ + } + + /* 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 + +#endif /* !(__ASM_SPARC_FLOPPY_H) */ |