package/kernel/mac80211/patches/830-b43-workaround-pcie-bcm4716.patch

   1 From 4f214b1ead0af7439921637645cb63f378516175 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sat, 21 Jan 2012 18:48:38 +0100
   4 Subject: [PATCH 33/34] b43: add workaround for b43 on pcie bus of bcm4716.
   5
   6 bcm4716 (which includes 4717 & 4718), plus 4706 on PCIe can reorder
   7 transactions. As a fix, a read after write is performed on certain
   8 places in the code. Older chips and the newer 5357 family don't require
   9 this fix.
  10 This code is based on the brcmsmac driver.
  11
  12 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  13 ---
  14  drivers/net/wireless/b43/b43.h        |   26 ++++++++++++++++++++++++++
  15  drivers/net/wireless/b43/bus.h        |   10 ++++++++++
  16  drivers/net/wireless/b43/phy_common.c |    6 ++++++
  17  drivers/net/wireless/b43/phy_n.c      |   10 +++++-----
  18  4 files changed, 47 insertions(+), 5 deletions(-)
  19
  20 --- a/drivers/net/wireless/b43/b43.h
  21 +++ b/drivers/net/wireless/b43/b43.h
  22 @@ -1061,6 +1061,31 @@ static inline bool b43_using_pio_transfe
  23         return dev->__using_pio_transfers;
  24  }
  25
  26 +/*
  27 + * bcm4716 (which includes 4717 & 4718), plus 4706 on PCIe can reorder
  28 + * transactions. As a fix, a read after write is performed on certain places
  29 + * in the code. Older chips and the newer 5357 family don't require this fix.
  30 + */
  31 +#ifdef CONFIG_BCM47XX_BCMA
  32 +#include <asm/mach-bcm47xx/bcm47xx.h>
  33 +static inline void b43_wflush16(struct b43_wldev *dev, u16 offset, u16 value)
  34 +{
  35 +       if (b43_bus_host_is_pci(dev->dev) &&
  36 +           bcm47xx_bus_type == BCM47XX_BUS_TYPE_BCMA &&
  37 +           bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4716) {
  38 +               b43_write16(dev, offset, value);
  39 +               b43_read16(dev, offset);
  40 +       } else {
  41 +               b43_write16(dev, offset, value);
  42 +       }
  43 +}
  44 +#else
  45 +static inline void b43_wflush16(struct b43_wldev *dev, u16 offset, u16 value)
  46 +{
  47 +       b43_write16(dev, offset, value);
  48 +}
  49 +#endif
  50 +
  51  /* Message printing */
  52  __printf(2, 3) void b43info(struct b43_wl *wl, const char *fmt, ...);
  53  __printf(2, 3) void b43err(struct b43_wl *wl, const char *fmt, ...);
  54 --- a/drivers/net/wireless/b43/bus.h
  55 +++ b/drivers/net/wireless/b43/bus.h
  56 @@ -60,6 +60,16 @@ static inline bool b43_bus_host_is_sdio(
  57         return (dev->bus_type == B43_BUS_SSB &&
  58                 dev->sdev->bus->bustype == SSB_BUSTYPE_SDIO);
  59  }
  60 +static inline bool b43_bus_host_is_pci(struct b43_bus_dev *dev)
  61 +{
  62 +       if (dev->bus_type == B43_BUS_SSB)
  63 +               return (dev->sdev->bus->bustype == SSB_BUSTYPE_PCI);
  64 +#ifdef CPTCFG_B43_BCMA
  65 +       if (dev->bus_type == B43_BUS_BCMA)
  66 +               return (dev->bdev->bus->hosttype == BCMA_HOSTTYPE_PCI);
  67 +#endif
  68 +       return false;
  69 +}
  70
  71  struct b43_bus_dev *b43_bus_dev_bcma_init(struct bcma_device *core);
  72  struct b43_bus_dev *b43_bus_dev_ssb_init(struct ssb_device *sdev);
  73 --- a/drivers/net/wireless/b43/main.c
  74 +++ b/drivers/net/wireless/b43/main.c
  75 @@ -4437,7 +4437,7 @@ static int b43_phy_versioning(struct b43
  76                 u16 radio24[3];
  77
  78                 for (tmp = 0; tmp < 3; tmp++) {
  79 -                       b43_write16(dev, B43_MMIO_RADIO24_CONTROL, tmp);
  80 +                       b43_wflush16(dev, B43_MMIO_RADIO24_CONTROL, tmp);
  81                         radio24[tmp] = b43_read16(dev, B43_MMIO_RADIO24_DATA);
  82                 }
  83
  84 @@ -4456,10 +4456,10 @@ static int b43_phy_versioning(struct b43
  85                         else
  86                                 tmp = 0x5205017F;
  87                 } else {
  88 -                       b43_write16(dev, B43_MMIO_RADIO_CONTROL,
  89 +                       b43_wflush16(dev, B43_MMIO_RADIO_CONTROL,
  90                                     B43_RADIOCTL_ID);
  91                         tmp = b43_read16(dev, B43_MMIO_RADIO_DATA_LOW);
  92 -                       b43_write16(dev, B43_MMIO_RADIO_CONTROL,
  93 +                       b43_wflush16(dev, B43_MMIO_RADIO_CONTROL,
  94                                     B43_RADIOCTL_ID);
  95                         tmp |= (u32)b43_read16(dev, B43_MMIO_RADIO_DATA_HIGH)
  96                                 << 16;
  97 --- a/drivers/net/wireless/b43/phy_common.c
  98 +++ b/drivers/net/wireless/b43/phy_common.c
  99 @@ -266,6 +266,12 @@ void b43_phy_write(struct b43_wldev *dev
 100  {
 101         assert_mac_suspended(dev);
 102         dev->phy.ops->phy_write(dev, reg, value);
 103 +#ifdef CONFIG_BCM47XX
 104 +       if (b43_bus_host_is_pci(dev->dev) && reg == 0x72) {
 105 +               b43_read16(dev, B43_MMIO_PHY_VER);
 106 +               return;
 107 +       }
 108 +#endif
 109         if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) {
 110                 b43_read16(dev, B43_MMIO_PHY_VER);
 111                 dev->phy.writes_counter = 0;
 112 --- a/drivers/net/wireless/b43/phy_ht.c
 113 +++ b/drivers/net/wireless/b43/phy_ht.c
 114 @@ -1073,20 +1073,20 @@ static unsigned int b43_phy_ht_op_get_de
 115
 116  static u16 b43_phy_ht_op_read(struct b43_wldev *dev, u16 reg)
 117  {
 118 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 119 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 120         return b43_read16(dev, B43_MMIO_PHY_DATA);
 121  }
 122
 123  static void b43_phy_ht_op_write(struct b43_wldev *dev, u16 reg, u16 value)
 124  {
 125 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 126 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 127         b43_write16(dev, B43_MMIO_PHY_DATA, value);
 128  }
 129
 130  static void b43_phy_ht_op_maskset(struct b43_wldev *dev, u16 reg, u16 mask,
 131                                  u16 set)
 132  {
 133 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 134 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 135         b43_write16(dev, B43_MMIO_PHY_DATA,
 136                     (b43_read16(dev, B43_MMIO_PHY_DATA) & mask) | set);
 137  }
 138 @@ -1096,14 +1096,14 @@ static u16 b43_phy_ht_op_radio_read(stru
 139         /* HT-PHY needs 0x200 for read access */
 140         reg |= 0x200;
 141
 142 -       b43_write16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 143 +       b43_wflush16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 144         return b43_read16(dev, B43_MMIO_RADIO24_DATA);
 145  }
 146
 147  static void b43_phy_ht_op_radio_write(struct b43_wldev *dev, u16 reg,
 148                                       u16 value)
 149  {
 150 -       b43_write16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 151 +       b43_wflush16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 152         b43_write16(dev, B43_MMIO_RADIO24_DATA, value);
 153  }
 154
 155 --- a/drivers/net/wireless/b43/phy_lcn.c
 156 +++ b/drivers/net/wireless/b43/phy_lcn.c
 157 @@ -845,20 +845,20 @@ static void b43_phy_lcn_op_adjust_txpowe
 158
 159  static u16 b43_phy_lcn_op_read(struct b43_wldev *dev, u16 reg)
 160  {
 161 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 162 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 163         return b43_read16(dev, B43_MMIO_PHY_DATA);
 164  }
 165
 166  static void b43_phy_lcn_op_write(struct b43_wldev *dev, u16 reg, u16 value)
 167  {
 168 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 169 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 170         b43_write16(dev, B43_MMIO_PHY_DATA, value);
 171  }
 172
 173  static void b43_phy_lcn_op_maskset(struct b43_wldev *dev, u16 reg, u16 mask,
 174                                    u16 set)
 175  {
 176 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 177 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 178         b43_write16(dev, B43_MMIO_PHY_DATA,
 179                     (b43_read16(dev, B43_MMIO_PHY_DATA) & mask) | set);
 180  }
 181 @@ -868,14 +868,14 @@ static u16 b43_phy_lcn_op_radio_read(str
 182         /* LCN-PHY needs 0x200 for read access */
 183         reg |= 0x200;
 184
 185 -       b43_write16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 186 +       b43_wflush16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 187         return b43_read16(dev, B43_MMIO_RADIO24_DATA);
 188  }
 189
 190  static void b43_phy_lcn_op_radio_write(struct b43_wldev *dev, u16 reg,
 191                                        u16 value)
 192  {
 193 -       b43_write16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 194 +       b43_wflush16(dev, B43_MMIO_RADIO24_CONTROL, reg);
 195         b43_write16(dev, B43_MMIO_RADIO24_DATA, value);
 196  }
 197
 198 --- a/drivers/net/wireless/b43/phy_n.c
 199 +++ b/drivers/net/wireless/b43/phy_n.c
 200 @@ -5418,14 +5418,14 @@ static inline void check_phyreg(struct b
 201  static u16 b43_nphy_op_read(struct b43_wldev *dev, u16 reg)
 202  {
 203         check_phyreg(dev, reg);
 204 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 205 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 206         return b43_read16(dev, B43_MMIO_PHY_DATA);
 207  }
 208
 209  static void b43_nphy_op_write(struct b43_wldev *dev, u16 reg, u16 value)
 210  {
 211         check_phyreg(dev, reg);
 212 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 213 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 214         b43_write16(dev, B43_MMIO_PHY_DATA, value);
 215  }
 216
 217 @@ -5433,7 +5433,7 @@ static void b43_nphy_op_maskset(struct b
 218                                  u16 set)
 219  {
 220         check_phyreg(dev, reg);
 221 -       b43_write16(dev, B43_MMIO_PHY_CONTROL, reg);
 222 +       b43_wflush16(dev, B43_MMIO_PHY_CONTROL, reg);
 223         b43_maskset16(dev, B43_MMIO_PHY_DATA, mask, set);
 224  }
 225
 226 @@ -5444,7 +5444,7 @@ static u16 b43_nphy_op_radio_read(struct
 227         /* N-PHY needs 0x100 for read access */
 228         reg |= 0x100;
 229
 230 -       b43_write16(dev, B43_MMIO_RADIO_CONTROL, reg);
 231 +       b43_wflush16(dev, B43_MMIO_RADIO_CONTROL, reg);
 232         return b43_read16(dev, B43_MMIO_RADIO_DATA_LOW);
 233  }
 234
 235 @@ -5453,7 +5453,7 @@ static void b43_nphy_op_radio_write(stru
 236         /* Register 1 is a 32-bit register. */
 237         B43_WARN_ON(reg == 1);
 238
 239 -       b43_write16(dev, B43_MMIO_RADIO_CONTROL, reg);
 240 +       b43_wflush16(dev, B43_MMIO_RADIO_CONTROL, reg);
 241         b43_write16(dev, B43_MMIO_RADIO_DATA_LOW, value);
 242  }
 243