802.11/PHY/TxControl1

u16 PHY TX Control1 (u32 rspec)

The input rspec has the following layout:

Code:

Intiialize u16 control to 0
If this is an LP PHY or if this is an LCN PHY
1. Set u16 bw to 2
Otherwise
1. Set bw to rspec & 0x700 >> 8
If this is an HT PHY
1. Call HT_spatial_expansion with argument rspec and save result as rslt1
2. Call HT_get_power_rate with arguments rspec, bw, and rslt1. Save result as rslt2.
3. Return (rslt1 << 10 | rslt2 << 3 | rslt1)
If bw < 2
1. A b/w of 10 MHz is indicated, but not supported - set bw to 2
If rspec indicates an MIMO rate (rspec & 0x8000000 is not zero)
1. Set mcs to rspec & 0x7F
2. Set control to rspec & 0xFF00 >> 8
3. OR control with (mcs_table[mcs].phy_ctl3 << 8)
Else if rspec is a CCK rate AND this is not an LP PHY AND not an LCN PHY AND not an SSLPN PHY
- a, Set control to bw
Otherwise
1. Set rate to rspec & 0x7F
2. Set control to bw
3. Find the entry in wlc_rate_legacy_phyctl that matches the rate
4. Set phy_config to the control3 entry
5. OR control with phy_config << 8
6. OR control with (rspec & 0x3800) >> 8
Return control

struct mcs_info { u32 phy_rate_20; u32 phy_rate40; u32 phy_rate_20_sgi; u32 phy_rate_40_sgi; u8 phy_ctrl3; u8 legacy_ofdm_rate; }