[PATCH] b43: Implement fullmac-mode support

[Michael Buesch <mb@bu3sch.de>]

Recent work on the device firmware discovered a completely new hardware
mode for b43 devices.
All b43 devices have a bit in the MAC-control register to enable true
hardware-fullMAC support. In fullmac mode the MAC and PHY is completely serviced
by the firmware, so no driver support is required anymore.

Full hardware MAC support has advantages and disadvantages:

PRO:
- The b43 driver does support _all_ devices (also 802.11n) in STA and AP mode.
- The driver code is a lot simpler for the fullmac case. (It skips all of
  the software MAC and PHY init).
- People finally stop poking me to implement the N-PHY and LP-PHY code, yay.

CON:
- Packet injection is not supported in fullmac mode, yet. It's on
  the TODO list with deadline 1.4.2010.

The feature currently is disabled by default, because it isn't tested enough.
It can be enabled at modprobe time with the "fullmac=1" module parameter.

Signed-off-by: Michael Buesch <mb@bu3sch.de>

---

John, please queue this patch for 3.6.31.


Index: wireless-testing/drivers/net/wireless/b43/b43.h
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/b43.h	2009-04-01 00:00:18.000000000 +0200
+++ wireless-testing/drivers/net/wireless/b43/b43.h	2009-04-01 00:00:20.000000000 +0200
@@ -347,6 +347,7 @@ enum {
 #define B43_MACCTL_ENABLED		0x00000001	/* MAC Enabled */
 #define B43_MACCTL_PSM_RUN		0x00000002	/* Run Microcode */
 #define B43_MACCTL_PSM_JMP0		0x00000004	/* Microcode jump to 0 */
+#define B43_MACCTL_FULLMAC		0x00000008	/* Enable hardware full-MAC support */
 #define B43_MACCTL_SHM_ENABLED		0x00000100	/* SHM Enabled */
 #define B43_MACCTL_SHM_UPPER		0x00000200	/* SHM Upper */
 #define B43_MACCTL_IHR_ENABLED		0x00000400	/* IHR Region Enabled */
Index: wireless-testing/drivers/net/wireless/b43/main.c
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/main.c	2009-04-01 00:00:18.000000000 +0200
+++ wireless-testing/drivers/net/wireless/b43/main.c	2009-04-01 00:00:20.000000000 +0200
@@ -63,6 +63,10 @@ MODULE_LICENSE("GPL");
 MODULE_FIRMWARE(B43_SUPPORTED_FIRMWARE_ID);
 
 
+static int modparam_fullmac;
+module_param_named(fullmac, modparam_fullmac, int, 0444);
+MODULE_PARM_DESC(fullmac, "Switch the hardware into fullmac mode");
+
 static int modparam_bad_frames_preempt;
 module_param_named(bad_frames_preempt, modparam_bad_frames_preempt, int, 0444);
 MODULE_PARM_DESC(bad_frames_preempt,
@@ -4113,6 +4117,9 @@ static void b43_wireless_core_exit(struc
 		return;
 	b43_set_status(dev, B43_STAT_UNINIT);
 
+	if (modparam_fullmac)
+		goto ssb_disable;
+
 	/* Stop the microcode PSM. */
 	macctl = b43_read32(dev, B43_MMIO_MACCTL);
 	macctl &= ~B43_MACCTL_PSM_RUN;
@@ -4132,6 +4139,7 @@ static void b43_wireless_core_exit(struc
 		dev->wl->current_beacon = NULL;
 	}
 
+ssb_disable:
 	ssb_device_disable(dev->dev, 0);
 	ssb_bus_may_powerdown(dev->dev->bus);
 }
@@ -4157,6 +4165,14 @@ static int b43_wireless_core_init(struct
 		b43_wireless_core_reset(dev, tmp);
 	}
 
+	if (modparam_fullmac) {
+		b43_write32(dev, B43_MMIO_MACCTL,
+			    b43_read32(dev, B43_MMIO_MACCTL)
+			    | B43_MACCTL_FULLMAC);
+		err = 0;
+		goto out;
+	}
+
 	/* Reset all data structures. */
 	setup_struct_wldev_for_init(dev);
 	phy->ops->prepare_structs(dev);

-- 
Greetings, Michael.