/* SPDX-License-Identifier: GPL-2.0 */ /* asm/floppy.h: Sparc specific parts of the Floppy driver. * * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
*/
/* 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 { volatileunsignedchar status_82072; /* Main Status reg. */ #define dcr_82072 status_82072 /* Digital Control reg. */ #define status1_82077 status_82072 /* Auxiliary Status reg. 1 */
volatileunsignedchar data_82072; /* Data fifo. */ #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
volatileunsignedchar dor_82077; /* Digital Output reg. */ volatileunsignedchar tapectl_82077; /* What the? Tape control reg? */
volatileunsignedchar status_82077; /* Main Status Register. */ #define drs_82077 status_82077 /* Digital Rate Select reg. */
volatileunsignedchar data_82077; /* Data fifo. */ volatileunsignedchar ___unused; volatileunsignedchar dir_82077; /* Digital Input reg. */ #define dcr_82077 dir_82077 /* Config Control reg. */
};
/* You'll only ever find one controller on a SparcStation anyways. */ staticstruct sun_flpy_controller *sun_fdc = NULL;
/* 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. */ staticvoid sun_set_dor(unsignedchar value, int fdc_82077)
{ if (fdc_82077)
sun_fdc->dor_82077 = value;
}
staticunsignedchar 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?");
}
staticvoid sun_82072_fd_outb(unsignedchar 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;
}
staticunsignedchar 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?");
}
staticvoid sun_82077_fd_outb(unsignedchar 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. */ staticinlinevoid virtual_dma_init(void)
{ /* nothing... */
}
/* 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;
}
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