|
@@ -0,0 +1,246 @@
|
|
|
+/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
|
|
|
+ This file is part of the GNU C Library.
|
|
|
+ Contributed by Phil Blundell, based on the Alpha version by
|
|
|
+ David Mosberger.
|
|
|
+
|
|
|
+ The GNU C Library is free software; you can redistribute it and/or
|
|
|
+ modify it under the terms of the GNU Lesser General Public
|
|
|
+ License as published by the Free Software Foundation; either
|
|
|
+ version 2.1 of the License, or (at your option) any later version.
|
|
|
+
|
|
|
+ The GNU C Library is distributed in the hope that it will be useful,
|
|
|
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
+ Lesser General Public License for more details.
|
|
|
+
|
|
|
+ You should have received a copy of the GNU Lesser General Public
|
|
|
+ License along with the GNU C Library; if not, write to the Free
|
|
|
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
|
+ 02111-1307 USA. */
|
|
|
+
|
|
|
+/* I/O port access on the ARM is something of a fiction. What we do is to
|
|
|
+ map an appropriate area of /dev/mem into user space so that a program
|
|
|
+ can blast away at the hardware in such a way as to generate I/O cycles
|
|
|
+ on the bus. To insulate user code from dependencies on particular
|
|
|
+ hardware we don't allow calls to inb() and friends to be inlined, but
|
|
|
+ force them to come through code in here every time. Performance-critical
|
|
|
+ registers tend to be memory mapped these days so this should be no big
|
|
|
+ problem. */
|
|
|
+
|
|
|
+/* Once upon a time this file used mprotect to enable and disable
|
|
|
+ access to particular areas of I/O space. Unfortunately the
|
|
|
+ mprotect syscall also has the side effect of enabling caching for
|
|
|
+ the area affected (this is a kernel limitation). So we now just
|
|
|
+ enable all the ports all of the time. */
|
|
|
+
|
|
|
+#include <errno.h>
|
|
|
+#include <fcntl.h>
|
|
|
+#include <stdio.h>
|
|
|
+#include <ctype.h>
|
|
|
+#include <stdlib.h>
|
|
|
+#include <string.h>
|
|
|
+#include <unistd.h>
|
|
|
+
|
|
|
+#include <sys/types.h>
|
|
|
+#include <sys/mman.h>
|
|
|
+
|
|
|
+#include <asm/page.h>
|
|
|
+#include <sys/sysctl.h>
|
|
|
+
|
|
|
+#define PATH_ARM_SYSTYPE "/etc/arm_systype"
|
|
|
+#define PATH_CPUINFO "/proc/cpuinfo"
|
|
|
+
|
|
|
+#define MAX_PORT 0x10000
|
|
|
+
|
|
|
+static struct {
|
|
|
+ unsigned long int base;
|
|
|
+ unsigned long int io_base;
|
|
|
+ unsigned int shift;
|
|
|
+ unsigned int initdone; /* since all the above could be 0 */
|
|
|
+} io;
|
|
|
+
|
|
|
+#define IO_BASE_FOOTBRIDGE 0x7c000000
|
|
|
+#define IO_SHIFT_FOOTBRIDGE 0
|
|
|
+
|
|
|
+static struct platform {
|
|
|
+ const char *name;
|
|
|
+ unsigned long int io_base;
|
|
|
+ unsigned int shift;
|
|
|
+} platform[] = {
|
|
|
+ /* All currently supported platforms are in fact the same. :-) */
|
|
|
+ {"Chalice-CATS", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
|
|
|
+ {"DEC-EBSA285", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
|
|
|
+ {"Corel-NetWinder", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
|
|
|
+ {"Rebel-NetWinder", IO_BASE_FOOTBRIDGE, IO_SHIFT_FOOTBRIDGE},
|
|
|
+};
|
|
|
+
|
|
|
+#define IO_ADDR(port) (io.base + ((port) << io.shift))
|
|
|
+
|
|
|
+/*
|
|
|
+ * Initialize I/O system. There are several ways to get the information
|
|
|
+ * we need. Each is tried in turn until one succeeds.
|
|
|
+ *
|
|
|
+ * 1. Sysctl (CTL_BUS, BUS_ISA, ISA_*). This is the preferred method
|
|
|
+ * but not all kernels support it.
|
|
|
+ *
|
|
|
+ * 2. Read the value (not the contents) of symlink PATH_ARM_SYSTYPE.
|
|
|
+ * - If it matches one of the entries in the table above, use the
|
|
|
+ * corresponding values.
|
|
|
+ * - If it begins with a number, assume this is a previously
|
|
|
+ * unsupported system and the values encode, in order,
|
|
|
+ * "<io_base>,<port_shift>".
|
|
|
+ *
|
|
|
+ * 3. Lookup the "system type" field in /proc/cpuinfo. Again, if it
|
|
|
+ * matches an entry in the platform[] table, use the corresponding
|
|
|
+ * values.
|
|
|
+ */
|
|
|
+
|
|
|
+static int
|
|
|
+init_iosys (void)
|
|
|
+{
|
|
|
+ char systype[256];
|
|
|
+ int i, n;
|
|
|
+ static int iobase_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_BASE };
|
|
|
+ static int ioshift_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_SHIFT };
|
|
|
+ size_t len = sizeof(io.base);
|
|
|
+
|
|
|
+ if (! sysctl (iobase_name, 3, &io.io_base, &len, NULL, 0)
|
|
|
+ && ! sysctl (ioshift_name, 3, &io.shift, &len, NULL, 0)) {
|
|
|
+ io.initdone = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ n = readlink (PATH_ARM_SYSTYPE, systype, sizeof (systype) - 1);
|
|
|
+ if (n > 0) {
|
|
|
+ systype[n] = '\0';
|
|
|
+ if (isdigit (systype[0])) {
|
|
|
+ if (sscanf (systype, "%li,%i", &io.io_base, &io.shift) == 2) {
|
|
|
+ io.initdone = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ /* else we're likely going to fail with the system match below */
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ FILE * fp;
|
|
|
+
|
|
|
+ fp = fopen (PATH_CPUINFO, "r");
|
|
|
+ if (! fp)
|
|
|
+ return -1;
|
|
|
+ while ((n = fscanf (fp, "Hardware\t: %256[^\n]\n", systype)) != EOF) {
|
|
|
+ if (n == 1)
|
|
|
+ break;
|
|
|
+ else
|
|
|
+ fgets (systype, 256, fp);
|
|
|
+ }
|
|
|
+ fclose (fp);
|
|
|
+
|
|
|
+ if (n == EOF) {
|
|
|
+ /* this can happen if the format of /proc/cpuinfo changes... */
|
|
|
+ fprintf (stderr, "ioperm: Unable to determine system type.\n"
|
|
|
+ "\t(May need " PATH_ARM_SYSTYPE " symlink?)\n");
|
|
|
+ __set_errno (ENODEV);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* translate systype name into i/o system: */
|
|
|
+ for (i = 0; i < sizeof (platform) / sizeof (platform[0]); ++i) {
|
|
|
+ if (strcmp (platform[i].name, systype) == 0) {
|
|
|
+ io.shift = platform[i].shift;
|
|
|
+ io.io_base = platform[i].io_base;
|
|
|
+ io.initdone = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* systype is not a known platform name... */
|
|
|
+ __set_errno (EINVAL);
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+int ioperm (unsigned long int from, unsigned long int num, int turn_on)
|
|
|
+{
|
|
|
+ if (! io.initdone && init_iosys () < 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ /* this test isn't as silly as it may look like; consider overflows! */
|
|
|
+ if (from >= MAX_PORT || from + num > MAX_PORT) {
|
|
|
+ __set_errno (EINVAL);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (turn_on) {
|
|
|
+ if (! io.base) {
|
|
|
+ int fd;
|
|
|
+
|
|
|
+ fd = open ("/dev/mem", O_RDWR);
|
|
|
+ if (fd < 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ io.base = (unsigned long int) mmap (0, MAX_PORT << io.shift,
|
|
|
+ PROT_READ | PROT_WRITE,
|
|
|
+ MAP_SHARED, fd, io.io_base);
|
|
|
+ close (fd);
|
|
|
+ if ((long) io.base == -1)
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int iopl (unsigned int level)
|
|
|
+{
|
|
|
+ if (level > 3) {
|
|
|
+ __set_errno (EINVAL);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ if (level) {
|
|
|
+ return ioperm (0, MAX_PORT, 1);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void
|
|
|
+outb(unsigned char b, unsigned long int port)
|
|
|
+{
|
|
|
+ *((volatile unsigned char *)(IO_ADDR (port))) = b;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void
|
|
|
+outw(unsigned short b, unsigned long int port)
|
|
|
+{
|
|
|
+ *((volatile unsigned short *)(IO_ADDR (port))) = b;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void
|
|
|
+outl(unsigned int b, unsigned long int port)
|
|
|
+{
|
|
|
+ *((volatile unsigned long *)(IO_ADDR (port))) = b;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+unsigned int
|
|
|
+inb (unsigned long int port)
|
|
|
+{
|
|
|
+ return *((volatile unsigned char *)(IO_ADDR (port)));
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+unsigned int
|
|
|
+inw(unsigned long int port)
|
|
|
+{
|
|
|
+ return *((volatile unsigned short *)(IO_ADDR (port)));
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+unsigned int
|
|
|
+inl(unsigned long int port)
|
|
|
+{
|
|
|
+ return *((volatile unsigned long *)(IO_ADDR (port)));
|
|
|
+}
|