kernel: support watchdog (and so reboot) on BCM53573

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

diff --git a/target/linux/generic/patches-4.4/180-bcma-support-BCM53573-series-of-wireless-SoCs.patch b/target/linux/generic/patches-4.4/180-bcma-support-BCM53573-series-of-wireless-SoCs.patch
new file mode 100644 (file)
index 0000000..49e8e5d
--- /dev/null
+++ b/target/linux/generic/patches-4.4/180-bcma-support-BCM53573-series-of-wireless-SoCs.patch
@@ -0,0 +1,104 @@
+From 78921f39c6495203bbbf4207c442c2b59f8f11c0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Mon, 25 Jul 2016 18:03:17 +0200
+Subject: [PATCH] bcma: support BCM53573 series of wireless SoCs
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+BCM53573 seems to be the first series of Northstar family with wireless
+on the chip. The base models are BCM53573-s (A0, A1) and there is also
+BCM47189B0 which seems to be some small modification.
+
+The only problem with these chipsets seems to be watchdog. It's totally
+unavailable on 53573A0 / 53573A1 and preferable PMU watchdog is broken
+on 53573B0 / 53573B1.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/bcma/driver_chipcommon.c | 32 +++++++++++++++++++++++++++++---
+ include/linux/bcma/bcma.h        |  3 +++
+ 2 files changed, 32 insertions(+), 3 deletions(-)
+
+--- a/drivers/bcma/driver_chipcommon.c
++++ b/drivers/bcma/driver_chipcommon.c
+@@ -36,12 +36,31 @@ u32 bcma_chipco_get_alp_clock(struct bcm
+ }
+ EXPORT_SYMBOL_GPL(bcma_chipco_get_alp_clock);
+ 
++static bool bcma_core_cc_has_pmu_watchdog(struct bcma_drv_cc *cc)
++{
++      struct bcma_bus *bus = cc->core->bus;
++
++      if (cc->capabilities & BCMA_CC_CAP_PMU) {
++              if (bus->chipinfo.id == BCMA_CHIP_ID_BCM53573) {
++                      WARN(bus->chipinfo.rev <= 1, "No watchdog available\n");
++                      /* 53573B0 and 53573B1 have bugged PMU watchdog. It can
++                       * be enabled but timer can't be bumped. Use CC one
++                       * instead.
++                       */
++                      return false;
++              }
++              return true;
++      } else {
++              return false;
++      }
++}
++
+ static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
+ {
+       struct bcma_bus *bus = cc->core->bus;
+       u32 nb;
+ 
+-      if (cc->capabilities & BCMA_CC_CAP_PMU) {
++      if (bcma_core_cc_has_pmu_watchdog(cc)) {
+               if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
+                       nb = 32;
+               else if (cc->core->id.rev < 26)
+@@ -95,9 +114,16 @@ static int bcma_chipco_watchdog_ticks_pe
+ 
+ int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc)
+ {
++      struct bcma_bus *bus = cc->core->bus;
+       struct bcm47xx_wdt wdt = {};
+       struct platform_device *pdev;
+ 
++      if (bus->chipinfo.id == BCMA_CHIP_ID_BCM53573 &&
++          bus->chipinfo.rev <= 1) {
++              pr_debug("No watchdog on 53573A0 / 53573A1\n");
++              return 0;
++      }
++
+       wdt.driver_data = cc;
+       wdt.timer_set = bcma_chipco_watchdog_timer_set_wdt;
+       wdt.timer_set_ms = bcma_chipco_watchdog_timer_set_ms_wdt;
+@@ -105,7 +131,7 @@ int bcma_chipco_watchdog_register(struct
+               bcma_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;
+ 
+       pdev = platform_device_register_data(NULL, "bcm47xx-wdt",
+-                                           cc->core->bus->num, &wdt,
++                                           bus->num, &wdt,
+                                            sizeof(wdt));
+       if (IS_ERR(pdev))
+               return PTR_ERR(pdev);
+@@ -217,7 +243,7 @@ u32 bcma_chipco_watchdog_timer_set(struc
+       u32 maxt;
+ 
+       maxt = bcma_chipco_watchdog_get_max_timer(cc);
+-      if (cc->capabilities & BCMA_CC_CAP_PMU) {
++      if (bcma_core_cc_has_pmu_watchdog(cc)) {
+               if (ticks == 1)
+                       ticks = 2;
+               else if (ticks > maxt)
+--- a/include/linux/bcma/bcma.h
++++ b/include/linux/bcma/bcma.h
+@@ -203,6 +203,9 @@ struct bcma_host_ops {
+ #define  BCMA_PKG_ID_BCM4709  0
+ #define BCMA_CHIP_ID_BCM47094 53030
+ #define BCMA_CHIP_ID_BCM53018 53018
++#define BCMA_CHIP_ID_BCM53573 53573
++#define  BCMA_PKG_ID_BCM53573 0
++#define  BCMA_PKG_ID_BCM47189 1
+ 
+ /* Board types (on PCI usually equals to the subsystem dev id) */
+ /* BCM4313 */