path: root/drivers/net/wireless/orinoco/hw.c

/* Encapsulate basic setting changes and retrieval on Hermes hardware
 *
 * See copyright notice in main.c
 */
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/if_arp.h>
#include <linux/ieee80211.h>
#include <linux/wireless.h>
#include <net/cfg80211.h>
#include "hermes.h"
#include "hermes_rid.h"
#include "orinoco.h"

#include "hw.h"

#define SYMBOL_MAX_VER_LEN	(14)

/* Symbol firmware has a bug allocating buffers larger than this */
#define TX_NICBUF_SIZE_BUG	1585

/********************************************************************/
/* Data tables                                                      */
/********************************************************************/

/* This tables gives the actual meanings of the bitrate IDs returned
 * by the firmware. */
static const struct {
	int bitrate; /* in 100s of kilobits */
	int automatic;
	u16 agere_txratectrl;
	u16 intersil_txratectrl;
} bitrate_table[] = {
	{110, 1,  3, 15}, /* Entry 0 is the default */
	{10,  0,  1,  1},
	{10,  1,  1,  1},
	{20,  0,  2,  2},
	{20,  1,  6,  3},
	{55,  0,  4,  4},
	{55,  1,  7,  7},
	{110, 0,  5,  8},
};
#define BITRATE_TABLE_SIZE ARRAY_SIZE(bitrate_table)

/* Firmware version encoding */
struct comp_id {
	u16 id, variant, major, minor;
} __packed;

static inline enum fwtype determine_firmware_type(struct comp_id *nic_id)
{
	if (nic_id->id < 0x8000)
		return FIRMWARE_TYPE_AGERE;
	else if (nic_id->id == 0x8000 && nic_id->major == 0)
		return FIRMWARE_TYPE_SYMBOL;
	else
		return FIRMWARE_TYPE_INTERSIL;
}

/* Set priv->firmware type, determine firmware properties
 * This function can be called before we have registerred with netdev,
 * so all errors go out with dev_* rather than printk
 *
 * If non-NULL stores a firmware description in fw_name.
 * If non-NULL stores a HW version in hw_ver
 *
 * These are output via generic cfg80211 ethtool support.
 */
int determine_fw_capabilities(struct orinoco_private *priv,
			      char *fw_name, size_t fw_name_len,
			      u32 *hw_ver)
{
	struct device *dev = priv->dev;
	struct hermes *hw = &priv->hw;
	int err;
	struct comp_id nic_id, sta_id;
	unsigned int firmver;
	char tmp[SYMBOL_MAX_VER_LEN + 1] __attribute__((aligned(2)));

	/* Get the hardware version */
	err = HERMES_READ_RECORD(hw, USER_BAP, HERMES_RID_NICID, &nic_id);
	if (err) {
		dev_err(dev, "Cannot read hardware identity: error %d\n",
			err);
		return err;
	}

	le16_to_cpus(&nic_id.id);
	le16_to_cpus(&nic_id.variant);
	le16_to_cpus(&nic_id.major);
	le16_to_cpus(&nic_id.minor);
	dev_info(dev, "Hardware identity %04x:%04x:%04x:%04x\n",
		 nic_id.id, nic_id.variant, nic_id.major, nic_id.minor);

	if (hw_ver)
		*hw_ver = (((nic_id.id & 0xff) << 24) |
			   ((nic_id.variant & 0xff) << 16) |
			   ((nic_id.major & 0xff) << 8) |
			   (nic_id.minor & 0xff));

	priv->firmware_type = determine_firmware_type(&nic_id);

	/* Get the firmware version */
	err = HERMES_READ_RECORD(hw, USER_BAP, HERMES_RID_STAID, &sta_id);
	if (err) {
		dev_err(dev, "Cannot read station identity: error %d\n",
			err);
		return err;
	}

	le16_to_cpus(&sta_id.id);
	le16_to_cpus(&sta_id.variant);
	le16_to_cpus(&sta_id.major);
	le16_to_cpus(&sta_id.minor);
	dev_info(dev, "Station identity  %04x:%04x:%04x:%04x\n",
		 sta_id.id, sta_id.variant, sta_id.major,