summaryrefslogtreecommitdiffstats
path: root/arch/sparc/include/asm/floppy_32.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/include/asm/floppy_32.h')
-rw-r--r--arch/sparc/include/asm/floppy_32.h393
1 files changed, 393 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/floppy_32.h b/arch/sparc/include/asm/floppy_32.h
new file mode 100644
index 000000000..836f6575a
--- /dev/null
+++ b/arch/sparc/include/asm/floppy_32.h
@@ -0,0 +1,393 @@
+/* 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)
+ */
+
+#ifndef __ASM_SPARC_FLOPPY_H
+#define __ASM_SPARC_FLOPPY_H
+
+#include <linux/of.h>
+#include <linux/of_platform.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) */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 05:25:30 +0000