sdio: initial CIS parsing code

Signed-off-by: Nicolas Pitre <npitre@mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 119 insertions, 0 deletions

diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
new file mode 100644
index 00000000000..114b600cd78
--- /dev/null
+++ b/drivers/mmc/core/sdio_cis.c
@@ -0,0 +1,119 @@
+/*
+ * linux/drivers/mmc/core/sdio_cis.c
+ *
+ * Author:	Nicolas Pitre
+ * Created:	June 11, 2007
+ * Copyright:	MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/kernel.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_cis.h"
+#include "sdio_ops.h"
+
+static int cistpl_manfid(struct sdio_func *func,
+			 const unsigned char *buf,
+			 unsigned size)
+{
+	/* TPLMID_MANF */
+	func->vendor = buf[0] | (buf[1] << 8);
+
+	/* TPLMID_CARD */
+	func->device = buf[2] | (buf[3] << 8);
+
+	return 0;
+}
+
+struct cis_tpl {
+	unsigned char code;
+	unsigned char min_size;
+	int (*parse)(struct sdio_func *, const unsigned char *buf, unsigned size);
+};
+
+static const struct cis_tpl cis_tpl_list[] = {
+	{	0x15,	3,	/* cistpl_vers_1 */	},
+	{	0x20,	4,	cistpl_manfid		},
+	{	0x21,	2,	/* cistpl_funcid */	},
+	{	0x22,	0,	/* cistpl_funce */	},
+};
+
+int sdio_read_cis(struct sdio_func *func)
+{
+	int ret;
+	unsigned char *buf;
+	unsigned i, ptr = 0;
+
+	for (i = 0; i < 3; i++) {
+		unsigned char x;
+		ret = mmc_io_rw_direct(func->card, 0, 0,
+				func->num * 0x100 + SDIO_FBR_CIS + i, 0, &x);
+		if (ret)
+			return ret;
+		ptr |= x << (i * 8);
+	}
+
+	buf = kmalloc(256, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	do {
+		unsigned char tpl_code, tpl_link;
+		const struct cis_tpl *tpl;
+
+		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_code);
+		if (ret)
+			break;
+
+		/* 0xff means we're done */
+		if (tpl_code == 0xff)
+			break;
+
+		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_link);
+		if (ret)
+			break;
+
+		for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
+			if (cis_tpl_list[i].code == tpl_code)
+				break;
+		if (i >= ARRAY_SIZE(cis_tpl_list)) {
+			printk(KERN_WARNING
+			       "%s: unknown CIS tuple 0x%02x of length %u\n",
+			       sdio_func_id(func), tpl_code, tpl_link);
+			ptr += tpl_link;
+			continue;
+		}
+		tpl = cis_tpl_list + i;
+
+		if (tpl_link < tpl->min_size) {
+			printk(KERN_ERR
+			       "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u\n",
+			       sdio_func_id(func), tpl_code, tpl_link, tpl->min_size);
+			ret = -EINVAL;
+			break;
+		}
+
+		for (i = 0; i < tpl_link; i++) {
+			ret = mmc_io_rw_direct(func->card, 0, 0, ptr + i, 0, &buf[i]);
+			if (ret)
+				break;
+		}
+		if (ret)
+			break;
+		ptr += tpl_link;
+
+		if (tpl->parse)
+			ret = tpl->parse(func, buf, tpl_link);
+	} while (!ret);
+
+	kfree(buf);
+	return ret;
+}