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-rw-r--r--cmd/portio.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/cmd/portio.c b/cmd/portio.c
new file mode 100644
index 0000000..bf3a997
--- /dev/null
+++ b/cmd/portio.c
@@ -0,0 +1,145 @@
+/*
+ * (C) Copyright 2003
+ * Marc Singer, elf@buici.com
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * Port I/O Functions
+ *
+ * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
+ */
+
+#include <common.h>
+#include <command.h>
+
+/* Display values from last command.
+ * Memory modify remembered values are different from display memory.
+ */
+static uint in_last_addr, in_last_size;
+static uint out_last_addr, out_last_size, out_last_value;
+
+
+int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+ uint addr = out_last_addr;
+ uint size = out_last_size;
+ uint value = out_last_value;
+
+ if (argc != 3)
+ return CMD_RET_USAGE;
+
+ if ((flag & CMD_FLAG_REPEAT) == 0) {
+ /*
+ * New command specified. Check for a size specification.
+ * Defaults to long if no or incorrect specification.
+ */
+ size = cmd_get_data_size (argv[0], 1);
+ addr = simple_strtoul (argv[1], NULL, 16);
+ value = simple_strtoul (argv[2], NULL, 16);
+ }
+#if defined (CONFIG_X86)
+
+ {
+ unsigned short port = addr;
+
+ switch (size) {
+ default:
+ case 1:
+ {
+ unsigned char ch = value;
+ __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
+ }
+ break;
+ case 2:
+ {
+ unsigned short w = value;
+ __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
+ }
+ break;
+ case 4:
+ __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
+
+ break;
+ }
+ }
+
+#endif /* CONFIG_X86 */
+
+ out_last_addr = addr;
+ out_last_size = size;
+ out_last_value = value;
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ out, 3, 1, do_portio_out,
+ "write datum to IO port",
+ "[.b, .w, .l] port value\n - output to IO port"
+);
+
+int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+ uint addr = in_last_addr;
+ uint size = in_last_size;
+
+ if (argc != 2)
+ return CMD_RET_USAGE;
+
+ if ((flag & CMD_FLAG_REPEAT) == 0) {
+ /*
+ * New command specified. Check for a size specification.
+ * Defaults to long if no or incorrect specification.
+ */
+ size = cmd_get_data_size (argv[0], 1);
+ addr = simple_strtoul (argv[1], NULL, 16);
+ }
+#if defined (CONFIG_X86)
+
+ {
+ unsigned short port = addr;
+
+ switch (size) {
+ default:
+ case 1:
+ {
+ unsigned char ch;
+ __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
+
+ printf (" %02x\n", ch);
+ }
+ break;
+ case 2:
+ {
+ unsigned short w;
+ __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
+
+ printf (" %04x\n", w);
+ }
+ break;
+ case 4:
+ {
+ unsigned long l;
+ __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
+
+ printf (" %08lx\n", l);
+ }
+ break;
+ }
+ }
+#endif /* CONFIG_X86 */
+
+ in_last_addr = addr;
+ in_last_size = size;
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ in, 2, 1, do_portio_in,
+ "read data from an IO port",
+ "[.b, .w, .l] port\n"
+ " - read datum from IO port"
+);