bcma: implement BCM4331 workaround for external PA lines

We need to disable ext. PA lines for reading SPROM. It's disabled by
default, but this patch allows using bcma after loading wl, which leaves
workaround enabled.

Cc: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/bcma/driver_chipcommon_pmu.c b/drivers/bcma/driver_chipcommon_pmu.c
index 5940c81..4bc10aa 100644 (file)
--- a/drivers/bcma/driver_chipcommon_pmu.c
+++ b/drivers/bcma/driver_chipcommon_pmu.c
@@ -90,6 +90,24 @@ void bcma_pmu_swreg_init(struct bcma_drv_cc *cc)
        }
 }
 
+/* Disable to allow reading SPROM. Don't know the adventages of enabling it. */
+void bcma_chipco_bcm4331_ext_pa_lines_ctl(struct bcma_drv_cc *cc, bool enable)
+{
+       struct bcma_bus *bus = cc->core->bus;
+       u32 val;
+
+       val = bcma_cc_read32(cc, BCMA_CC_CHIPCTL);
+       if (enable) {
+               val |= BCMA_CHIPCTL_4331_EXTPA_EN;
+               if (bus->chipinfo.pkg == 9 || bus->chipinfo.pkg == 11)
+                       val |= BCMA_CHIPCTL_4331_EXTPA_ON_GPIO2_5;
+       } else {
+               val &= ~BCMA_CHIPCTL_4331_EXTPA_EN;
+               val &= ~BCMA_CHIPCTL_4331_EXTPA_ON_GPIO2_5;
+       }
+       bcma_cc_write32(cc, BCMA_CC_CHIPCTL, val);
+}
+
 void bcma_pmu_workarounds(struct bcma_drv_cc *cc)
 {
        struct bcma_bus *bus = cc->core->bus;
@@ -99,7 +117,7 @@ void bcma_pmu_workarounds(struct bcma_drv_cc *cc)
                bcma_chipco_chipctl_maskset(cc, 0, ~0, 0x7);
                break;
        case 0x4331:
-               pr_err("Enabling Ext PA lines not implemented\n");
+               /* BCM4331 workaround is SPROM-related, we put it in sprom.c */
                break;
        case 43224:
                if (bus->chipinfo.rev == 0) {

diff --git a/drivers/bcma/sprom.c b/drivers/bcma/sprom.c
index 8b5b785..166ed13 100644 (file)
--- a/drivers/bcma/sprom.c
+++ b/drivers/bcma/sprom.c
@@ -152,6 +152,9 @@ int bcma_sprom_get(struct bcma_bus *bus)
        if (!sprom)
                return -ENOMEM;
 
+       if (bus->chipinfo.id == 0x4331)
+               bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, false);
+
        /* Most cards have SPROM moved by additional offset 0x30 (48 dwords).
         * According to brcm80211 this applies to cards with PCIe rev >= 6
         * TODO: understand this condition and use it */
@@ -159,6 +162,9 @@ int bcma_sprom_get(struct bcma_bus *bus)
                BCMA_CC_SPROM_PCIE6;
        bcma_sprom_read(bus, offset, sprom);
 
+       if (bus->chipinfo.id == 0x4331)
+               bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, true);
+
        err = bcma_sprom_valid(sprom);
        if (err)
                goto out;

diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index 6083725..a7ae33d 100644 (file)
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -283,6 +283,22 @@
 #define BCMA_CC_PPL_PCHI_OFF           5
 #define BCMA_CC_PPL_PCHI_MASK          0x0000003f
 
+/* BCM4331 ChipControl numbers. */
+#define BCMA_CHIPCTL_4331_BT_COEXIST           BIT(0)  /* 0 disable */
+#define BCMA_CHIPCTL_4331_SECI                 BIT(1)  /* 0 SECI is disabled (JATG functional) */
+#define BCMA_CHIPCTL_4331_EXT_LNA              BIT(2)  /* 0 disable */
+#define BCMA_CHIPCTL_4331_SPROM_GPIO13_15      BIT(3)  /* sprom/gpio13-15 mux */
+#define BCMA_CHIPCTL_4331_EXTPA_EN             BIT(4)  /* 0 ext pa disable, 1 ext pa enabled */
+#define BCMA_CHIPCTL_4331_GPIOCLK_ON_SPROMCS   BIT(5)  /* set drive out GPIO_CLK on sprom_cs pin */
+#define BCMA_CHIPCTL_4331_PCIE_MDIO_ON_SPROMCS BIT(6)  /* use sprom_cs pin as PCIE mdio interface */
+#define BCMA_CHIPCTL_4331_EXTPA_ON_GPIO2_5     BIT(7)  /* aband extpa will be at gpio2/5 and sprom_dout */
+#define BCMA_CHIPCTL_4331_OVR_PIPEAUXCLKEN     BIT(8)  /* override core control on pipe_AuxClkEnable */
+#define BCMA_CHIPCTL_4331_OVR_PIPEAUXPWRDOWN   BIT(9)  /* override core control on pipe_AuxPowerDown */
+#define BCMA_CHIPCTL_4331_PCIE_AUXCLKEN                BIT(10) /* pcie_auxclkenable */
+#define BCMA_CHIPCTL_4331_PCIE_PIPE_PLLDOWN    BIT(11) /* pcie_pipe_pllpowerdown */
+#define BCMA_CHIPCTL_4331_BT_SHD0_ON_GPIO4     BIT(16) /* enable bt_shd0 at gpio4 */
+#define BCMA_CHIPCTL_4331_BT_SHD1_ON_GPIO5     BIT(17) /* enable bt_shd1 at gpio5 */
+
 /* Data for the PMU, if available.
  * Check availability with ((struct bcma_chipcommon)->capabilities & BCMA_CC_CAP_PMU)
  */
@@ -342,6 +358,8 @@ extern void bcma_core_chipcommon_init(struct bcma_drv_cc *cc);
 extern void bcma_chipco_suspend(struct bcma_drv_cc *cc);
 extern void bcma_chipco_resume(struct bcma_drv_cc *cc);
 
+void bcma_chipco_bcm4331_ext_pa_lines_ctl(struct bcma_drv_cc *cc, bool enable);
+
 extern void bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc,
                                          u32 ticks);