pio: add `pio print < PIO` to turn a PIO dump into human readable

.gitignore

 fexc
 bin2fex
 fex2bin
+bootinfo
 fel
+pio
 *.o
 *.swp

Makefile

@@ -2,7 +2,7 @@ CC = gcc
 CFLAGS = -g -O0 -Wall -Wextra
 CFLAGS += -std=c99 -D_POSIX_C_SOURCE=200112L
 
-TOOLS = fexc bin2fex fex2bin bootinfo fel
+TOOLS = fexc bin2fex fex2bin bootinfo fel pio
 
 MISC_TOOLS = phoenix_info
 

pio.c

+/* needs _BSD_SOURCE for htole and letoh  */
+#define _BSD_SOURCE
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <endian.h>
+
+#define PIO_REG_SIZE 0x228 /*0x300*/
+#define PIO_PORT_SIZE 0x24
+
+#define errf(...)	fprintf(stderr, __VA_ARGS__)
+
+static inline int _read(int fd, char *buf, size_t l)
+{
+	ssize_t rc = 0;
+	while (l > 0) {
+		rc = read(fd, buf, l);
+		if (rc >= 0)
+			break;
+		else if (rc < 0 && errno != EINTR) {
+			errf("read: %s\n", strerror(errno));
+			break;
+		}
+	}
+
+	return rc;
+}
+
+static int read_fixed_stdin(char *buf, size_t wanted)
+{
+	ssize_t rc;
+	char eof;
+
+	while (wanted > 0) {
+		rc = _read(0, buf, wanted);
+		if (rc > 0) {
+			wanted -= rc;
+			buf += rc;
+		} else if (rc == 0) {
+			errf("read: input too small\n");
+			goto fail;
+		} else if (rc < 0) {
+			goto fail;
+		}
+	}
+
+	if (_read(0, &eof, 1) == 0)
+		return 1;
+
+	errf("read: input too large\n");
+fail:
+	return 0;
+}
+
+struct pio_status {
+	int mul_sel;
+	int pull;
+	int drv_level;
+	int data;
+};
+
+#define PIO_REG_CFG(B, N, I)	((B) + (N)*0x24 + ((I)<<2) + 0x00)
+#define PIO_REG_DLEVEL(B, N, I)	((B) + (N)*0x24 + ((I)<<2) + 0x14)
+#define PIO_REG_PULL(B, N, I)	((B) + (N)*0x24 + ((I)<<2) + 0x1C)
+#define PIO_REG_DATA(B, N)	((B) + (N)*0x24 + 0x10)
+
+#define LE32TOH(X)		le32toh(*((uint32_t*)(X)))
+
+static int pio_get(const char *buf, uint32_t port, uint32_t port_num, struct pio_status *pio)
+{
+	uint32_t val;
+	uint32_t port_num_func, port_num_pull;
+	uint32_t offset_func, offset_pull;
+
+	port_num_func = port_num >> 3;
+	offset_func = ((port_num - (port_num_func << 3)) << 2);
+
+	port_num_pull = port_num >> 4;
+	offset_pull = ((port_num - (port_num_pull << 4)) << 1);
+
+	/* func */
+	val = LE32TOH(PIO_REG_CFG(buf, port, port_num_func));
+	pio->mul_sel = (val>>offset_func) & 0x07;
+
+	/* pull */
+	val = LE32TOH(PIO_REG_PULL(buf, port, port_num_pull));
+	pio->pull = (val>>offset_pull) & 0x03;
+
+	/* dlevel */
+	val = LE32TOH(PIO_REG_DLEVEL(buf, port, port_num_pull));
+	pio->drv_level = (val>>offset_pull) & 0x03;
+
+	/* i/o data */
+	if (pio->mul_sel > 1)
+		pio->data = -1;
+	else {
+		val = LE32TOH(PIO_REG_CFG(buf, port, port_num_func));
+		pio->data = (val >> port_num) & 0x01;
+	}
+	return 1;
+}
+
+static void print(const char *buf)
+{
+	int port, i;
+	struct pio_status pio;
+	for (port=0; port < 10 /*PIO_REG_SIZE/0x24*/; port++) {
+		for (i=0; i<28; i++) {
+			if (pio_get(buf, port, i, &pio)) {
+				printf("P%c%d", 'A'+port, i+1);
+				printf("<%x>", pio.mul_sel);
+				printf("<%x>", pio.pull);
+				printf("<%x>", pio.drv_level);
+				if (pio.data >= 0)
+					printf("<%x>", pio.data);
+
+				fputc('\n', stdout);
+			}
+		}
+	}
+}
+static int read_and_print(void)
+{
+	char buf[PIO_REG_SIZE];
+
+	if (read_fixed_stdin(buf, PIO_REG_SIZE)) {
+		print(buf);
+		return 0;
+	}
+	return -1;
+}
+
+static inline int usage(const char *argv0)
+{
+	fprintf(stderr, "usage: %s print < PIO\n", argv0);
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	if (argc == 2 && (strncmp("print", argv[1], 5) == 0))
+		return read_and_print();
+	else
+		return usage(argv[0]);
+}
+