libertas: Add support for Marvell Libertas CF8305

The CF8305 is a very old silicon running firmware version 3.0 . This card also
needs some special treatment as it's so old it can't do unaligned register
access. But since that happens only at one place, there were no changes made to
the register access functions, but instead that particular place was fixed.
Also, this card uses only one-stage firmware which is loaded the same way as
helper firmware. The second-stage firmware isn't loaded on this card and doesn't
therefore have to be supplied.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/if_cs.c

@@ -59,6 +59,7 @@ struct if_cs_card {
 	struct pcmcia_device *p_dev;
 	struct lbs_private *priv;
 	void __iomem *iobase;
+	bool align_regs;
 };
 
 
@@ -274,16 +275,25 @@ static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 r
 #define IF_CS_PRODUCT_ID		0x0000001C
 #define IF_CS_CF8385_B1_REV		0x12
 #define IF_CS_CF8381_B3_REV		0x04
+#define IF_CS_CF8305_B1_REV		0x03
 
 /*
  * Used to detect other cards than CF8385 since their revisions of silicon
  * doesn't match those from CF8385, eg. CF8381 B3 works with this driver.
  */
+#define CF8305_MANFID		0x02db
+#define CF8305_CARDID		0x8103
 #define CF8381_MANFID		0x02db
 #define CF8381_CARDID		0x6064
 #define CF8385_MANFID		0x02df
 #define CF8385_CARDID		0x8103
 
+static inline int if_cs_hw_is_cf8305(struct pcmcia_device *p_dev)
+{
+	return (p_dev->manf_id == CF8305_MANFID &&
+		p_dev->card_id == CF8305_CARDID);
+}
+
 static inline int if_cs_hw_is_cf8381(struct pcmcia_device *p_dev)
 {
 	return (p_dev->manf_id == CF8381_MANFID &&
@@ -556,7 +566,15 @@ static int if_cs_prog_helper(struct if_cs_card *card)
 
 	lbs_deb_enter(LBS_DEB_CS);
 
-	scratch = if_cs_read8(card, IF_CS_SCRATCH);
+	/*
+	 * This is the only place where an unaligned register access happens on
+	 * the CF8305 card, therefore for the sake of speed of the driver, we do
+	 * the alignment correction here.
+	 */
+	if (card->align_regs)
+		scratch = if_cs_read16(card, IF_CS_SCRATCH) >> 8;
+	else
+		scratch = if_cs_read8(card, IF_CS_SCRATCH);
 
 	/* "If the value is 0x5a, the firmware is already
 	 * downloaded successfully"
@@ -880,8 +898,24 @@ static int if_cs_probe(struct pcmcia_device *p_dev)
 	       p_dev->irq.AssignedIRQ, p_dev->io.BasePort1,
 	       p_dev->io.BasePort1 + p_dev->io.NumPorts1 - 1);
 
+	/*
+	 * Most of the libertas cards can do unaligned register access, but some
+	 * weird ones can not. That's especially true for the CF8305 card.
+	 */
+	card->align_regs = 0;
+
 	/* Check if we have a current silicon */
 	prod_id = if_cs_read8(card, IF_CS_PRODUCT_ID);
+	if (if_cs_hw_is_cf8305(p_dev)) {
+		card->align_regs = 1;
+		if (prod_id < IF_CS_CF8305_B1_REV) {
+			lbs_pr_err("old chips like 8305 rev B3 "
+				"aren't supported\n");
+			ret = -ENODEV;
+			goto out2;
+		}
+	}
+
 	if (if_cs_hw_is_cf8381(p_dev) && prod_id < IF_CS_CF8381_B3_REV) {
 		lbs_pr_err("old chips like 8381 rev B3 aren't supported\n");
 		ret = -ENODEV;
@@ -896,7 +930,7 @@ static int if_cs_probe(struct pcmcia_device *p_dev)
 
 	/* Load the firmware early, before calling into libertas.ko */
 	ret = if_cs_prog_helper(card);
-	if (ret == 0)
+	if (ret == 0 && !if_cs_hw_is_cf8305(p_dev))
 		ret = if_cs_prog_real(card);
 	if (ret)
 		goto out2;
@@ -976,6 +1010,7 @@ static void if_cs_detach(struct pcmcia_device *p_dev)
 /********************************************************************/
 
 static struct pcmcia_device_id if_cs_ids[] = {
+	PCMCIA_DEVICE_MANF_CARD(CF8305_MANFID, CF8305_CARDID),
 	PCMCIA_DEVICE_MANF_CARD(CF8381_MANFID, CF8381_CARDID),
 	PCMCIA_DEVICE_MANF_CARD(CF8385_MANFID, CF8385_CARDID),
 	PCMCIA_DEVICE_NULL,