patch-2.1.106 linux/drivers/dio/dio.c

• Lines: 293
• Date: Sat Jun 13 13:14:31 1998
• Orig file: v2.1.105/linux/drivers/dio/dio.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.105/linux/drivers/dio/dio.c linux/drivers/dio/dio.c
@@ -0,0 +1,292 @@
+/* Code to support devices on the DIO (and eventually DIO-II) bus
+ * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
+ * 
+ * This code has basically these routines at the moment:
+ * int dio_find(u_int deviceid)
+ *    Search the list of DIO devices and return the select code
+ *    of the next unconfigured device found that matches the given device ID.
+ *    Note that the deviceid parameter should be the encoded ID.
+ *    This means that framebuffers should pass it as 
+ *    DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
+ *    (or whatever); everybody else just uses DIO_ID_FOOBAR.
+ * void *dio_scodetoviraddr(int scode)
+ *    Return the virtual address corresponding to the given select code.
+ *    NB: DIO-II devices will have to be mapped in in this routine!
+ * int dio_scodetoipl(int scode)
+ *    Every DIO card has a fixed interrupt priority level. This function 
+ *    returns it, whatever it is.
+ * const char *dio_scodetoname(int scode)
+ *    Return a character string describing this board [might be "" if 
+ *    not CONFIG_DIO_CONSTANTS]
+ * void dio_config_board(int scode)     mark board as configured in the list
+ * void dio_unconfig_board(int scode)   mark board as no longer configured
+ *
+ * This file is based on the way the Amiga port handles Zorro II cards, 
+ * although we aren't so complicated...
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/dio.h>
+#include <linux/malloc.h>                         /* kmalloc() */
+#include <linux/init.h>
+#include <asm/hwtest.h>                           /* hwreg_present() */
+#include <asm/io.h>                               /* readb() */
+/* not a real config option yet! */
+#define CONFIG_DIO_CONSTANTS
+
+#ifdef CONFIG_DIO_CONSTANTS
+/* We associate each numeric ID with an appropriate descriptive string
+ * using a constant array of these structs.
+ * FIXME: we should be able to arrange to throw away most of the strings
+ * using the initdata stuff. Then we wouldn't need to worry about 
+ * carrying them around...
+ * I think we do this by copying them into newly kmalloc()ed memory and 
+ * marking the names[] array as .initdata ?
+ */
+struct dioname
+{
+        int id;
+        const char *name;
+};
+
+/* useful macro */
+#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
+#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
+
+static struct dioname names[] = 
+{
+        DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
+        DIONAME(DCM), DIONAME(DCMREM),
+        DIONAME(LAN),
+        DIONAME(FHPIB), DIONAME(NHPIB), DIONAME(IHPIB),
+        DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
+        DIONAME(FBUFFER),
+        DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
+        DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
+        DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
+        DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), 
+        DIONAME(MISC12), DIONAME(MISC13),
+        DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
+        DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
+        DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
+        DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)   
+};
+
+#undef DIONAME
+#undef DIOFBNAME
+
+#define NUMNAMES (sizeof(names) / sizeof(struct dioname))
+
+static const char *unknowndioname 
+        = "unknown DIO board -- please email <pmaydell@chiark.greenend.org.uk>!";
+
+static const char *dio_getname(int id)
+{
+        /* return pointer to a constant string describing the board with given ID */
+	unsigned int i;
+        for (i = 0; i < NUMNAMES; i++)
+                if (names[i].id == id) 
+                        return names[i].name;
+        
+        return unknowndioname;
+}
+
+#else
+
+static char dio_no_name[] = { 0 };
+#define dio_getname(_id)	(dio_no_name)
+
+#endif /* CONFIG_DIO_CONSTANTS */
+
+/* We represent all the DIO boards in the system with a linked list of these structs. */
+struct dioboard
+{
+        struct dioboard *next;                    /* link to next struct in list */
+        int ipl;                                  /* IPL of this board */
+        int configured;                           /* has this board been configured? */
+        int scode;                                /* select code of this board */
+        int id;                                   /* encoded ID */
+        const char *name;
+};
+
+static struct dioboard *blist = NULL;
+
+__initfunc(static int dio_find_slow(int deviceid))
+{
+	/* Called to find a DIO device before the full bus scan has run.  Basically
+	   only used by the console driver.  */
+	int scode;
+	for (scode = 0; scode < DIO_SCMAX; scode++)
+	{
+		void *va;
+
+                if (DIO_SCINHOLE(scode))
+                        continue;
+                
+                va = dio_scodetoviraddr(scode);
+                if (!va || !hwreg_present(va + DIO_IDOFF))
+                        continue;             /* no board present at that select code */
+
+		if (DIO_ID(va) == deviceid)
+			return scode;
+	}
+	return 0;
+}
+
+int dio_find(int deviceid)
+{
+	if (blist) 
+	{
+		/* fast way */
+		struct dioboard *b;
+		for (b = blist; b; b = b->next)
+			if (b->id == deviceid && b->configured == 0)
+				return b->scode;
+		return 0;
+	}
+	return dio_find_slow(deviceid);
+}
+
+/* This is the function that scans the DIO space and works out what
+ * hardware is actually present.
+ */
+__initfunc(void dio_init(void))
+{
+        int scode;
+        struct dioboard *b, *bprev = NULL;
+   
+        printk("Scanning for DIO devices...\n");
+        
+        for (scode = 0; scode < DIO_SCMAX; ++scode)
+        {
+                u_char prid, secid = 0;        /* primary, secondary ID bytes */
+                u_char *va;
+                
+                if (DIO_SCINHOLE(scode))
+                        continue;
+                
+                va = dio_scodetoviraddr(scode);
+                if (!va || !hwreg_present(va + DIO_IDOFF))
+                        continue;              /* no board present at that select code */
+
+                /* Found a board, allocate it an entry in the list */
+                b = kmalloc(sizeof(struct dioboard), GFP_KERNEL);
+                
+                /* read the ID byte(s) and encode if necessary. Note workaround 
+                 * for broken internal HPIB devices...
+                 */
+                if (!DIO_ISIHPIB(scode))
+                        prid = DIO_ID(va);
+                else 
+                        prid = DIO_ID_IHPIB;
+                
+                if (DIO_NEEDSSECID(prid))
+                {
+                        secid = DIO_SECID(va);
+                        b->id = DIO_ENCODE_ID(prid, secid);
+                }
+                else
+                        b->id = prid;
+      
+                b->configured = 0;
+                b->scode = scode;
+                b->ipl = DIO_IPL(va);
+                b->name = dio_getname(b->id);
+                printk("select code %3d: ID %02X", scode, prid);
+                if (DIO_NEEDSSECID(b->id))
+                        printk(":%02X", secid);
+                printk(" %s\n", b->name);
+                
+                b->next = NULL;
+
+                if (bprev)
+                        bprev->next = b;
+                else
+                        blist = b;
+                bprev = b;
+        }
+}
+
+/* Bear in mind that this is called in the very early stages of initialisation
+ * in order to get the virtual address of the serial port for the console...
+ */
+void *dio_scodetoviraddr(int scode)
+{
+        if (scode > DIOII_SCBASE)
+        {
+                printk("dio_scodetoviraddr: don't support DIO-II yet!\n");
+                return 0;
+        }
+        else if (scode > DIO_SCMAX || scode < 0)
+                return 0;
+        else if (DIO_SCINHOLE(scode))
+                return 0;
+        else if (scode == DIO_IHPIBSCODE) /* this should really be #ifdef CONFIG_IHPIB */
+                return (void*)DIO_IHPIBADDR;   /* or something similar... */
+        
+        return (void*)(DIO_VIRADDRBASE + DIO_BASE + scode * 0x10000);
+}
+
+int dio_scodetoipl(int scode)
+{
+        struct dioboard *b;
+        for (b = blist; b; b = b->next)
+                if (b->scode == scode) 
+                        break;
+        
+        if (!b)
+        {
+                printk("dio_scodetoipl: bad select code %d\n", scode);
+                return 0;
+        }
+        else
+                return b->ipl;
+}
+
+const char *dio_scodetoname(int scode)
+{
+        struct dioboard *b;
+        for (b = blist; b; b = b->next)
+                if (b->scode == scode) 
+                        break;
+        
+        if (!b)
+        {
+                printk("dio_scodetoname: bad select code %d\n", scode);
+                return NULL;
+        }
+        else
+                return b->name;
+}
+
+void dio_config_board(int scode)
+{
+        struct dioboard *b;
+        for (b = blist; b; b = b->next)
+                if (b->scode == scode)
+                        break;
+   
+        if (!b) 
+                printk("dio_config_board: bad select code %d\n", scode);
+        else if (b->configured)
+                printk("dio_config_board: board at select code %d already configured\n", scode);
+        else
+                b->configured = 1;
+}
+
+void dio_unconfig_board(int scode)
+{
+        struct dioboard *b;
+        for (b = blist; b; b = b->next)
+                if (b->scode == scode) 
+                        break;
+   
+        if (!b) 
+                printk("dio_unconfig_board: bad select code %d\n", scode);
+        else if (!b->configured)
+                printk("dio_unconfig_board: board at select code %d not configured\n", 
+		       scode);
+        else 
+                b->configured = 0;
+}