| Broadcom Mac80211 driver |
| |
| This is a driver in progress. It has features still to be implemented well as |
| bugs in current code. |
| |
| |
| What's here and not here |
| ======================= |
| - Completely open source host driver, no binary object files |
| - Features Broadcom's OneDriver architecture (single source base for |
| supported chips and architectures) |
| - On-chip firmware loaded using standard request_firmware() |
| - Support for BCM43224, BCM43225, BCM4313 (PCIe NIC) |
| - Framework for supporting new chips, including mac80211-aware embedded chips |
| - Does not support older PCI/PCIe chips with SSB backplane |
| - Driver includes BMAC interface for transparent dongle support |
| - Uses minstrel_ht rate algorithm |
| - HW based encryption not enabled yet |
| |
| |
| What's done |
| ========== |
| - Integration with mac80211 stack |
| - A-MPDU single & dual stream rates |
| - BCM43224: Dualband, Dual stream, 20MHz channels |
| Throughput (in chamber): ~85-90 Mbits/sec (in both 2.4 & 5 GHz bands) |
| - BCM43225: 2.4 GHz, Dual Stream, 20MHz channels |
| Throughput (in chamber): ~85-90 Mbits/sec |
| - BCM4313: 2.4 GHz, Single Stream |
| Throughput (in chamber): ~40 Mbits/sec |
| |
| |
| Things To Be Done |
| ================= |
| See the TODO file |
| |
| |
| Firmware installation |
| ====================== |
| Firmware is available from the Linux firmware repository at: |
| |
| git://git.kernel.org/pub/scm/linux/kernel/git/dwmw2/linux-firmware.git |
| http://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git |
| https://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git |
| |
| For all chips, copy brcm/bcm43xx-0.fw and brcm/bcm43xx_hdr-0.fw to |
| /lib/firmware/brcm (or wherever firmware is normally installed on your system). |
| |
| Currently supported chips |
| ============== |
| PCI |
| Name Device ID |
| BCM4313 0x4727 |
| BCM43224 0x4353 |
| BCM43225 0x4357 |
| |
| |
| Bugs/Problems |
| ============== |
| - Driver can get confused while scanning during high throughput, can cause |
| burping, hanging, and possible crashing. |
| - Occasional hangs & burps with BCM43224 on 2.4 GHz with dual stream rates. |
| - Occasional crashes with BCM43224 on multicore machines. |
| |
| |
| Note on Regulatory Implementation |
| ================================ |
| This generation of chips contain additional regulatory support independent of |
| the driver. The devices use a single worldwide regulatory domain, with channels |
| 12-14 (2.4 GHz band) and channels 52-64 and 100-140 (5 GHz band) restricted to |
| passive operation. Transmission on those channels is suppressed until |
| appropriate other traffic is observed on those channels. |
| |
| Within the driver, we use the ficticious country code "X2" to represent this |
| worldwide regulatory domain. There is currently no interface to configure a |
| different domain. |
| |
| The driver reads the SROM country code from the chip and hands it up to |
| mac80211 as the regulatory hint, however this information is otherwise unused |
| with the driver. |
| |
| |
| Contact Info: |
| ============= |
| Brett Rudley brudley@broadcom.com |
| Henry Ptasinski henryp@broadcom.com |
| Dowan Kim dowan@broadcom.com |
| Roland Vossen rvossen@broadcom.com |
| Arend van Spriel arend@broadcom.com |
| |
