ARM: OMAP2+: PRM: create PRM reset source API for the watchdog timer driver

The OMAP watchdog timer driver needs to determine what caused the SoC
to reset for its GETBOOTSTATUS ioctl.  So, define a set of standard
reset sources across OMAP SoCs.  For OMAP2xxx, 3xxx, and 4xxx SoCs,
define mappings from the SoC-specific reset source register bits to
the standardized reset source IDs.  Create SoC-specific PRM functions
that read the appropriate per-SoC register and use the mapping to
return the standardized reset bits.  Register the SoC-specific PRM
functions with the common PRM code via prm_register().  Create a
function in the common PRM code, prm_read_reset_sources(), that
calls the SoC-specific function, registered during boot.

This patch does not yet handle some SoCs, such as AM33xx.  Those SoCs
were not handled by the code this will replace.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c
index e276ff270ac5..1fea656b2ca8 100644
--- a/arch/arm/mach-omap2/prm3xxx.c
+++ b/arch/arm/mach-omap2/prm3xxx.c
@@ -47,6 +47,27 @@ static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
         .restore_irqen          = &omap3xxx_prm_restore_irqen,
 };
 
+/*
+ * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware
+ *   register (which are specific to OMAP3xxx SoCs) to reset source ID
+ *   bit shifts (which is an OMAP SoC-independent enumeration)
+ */
+static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = {
+        { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
+        { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
+        { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
+        { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
+        { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
+        { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
+        { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT,
+          OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
+        { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT,
+          OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
+        { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
+        { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT },
+        { -1, -1 },
+};
+
 /* PRM VP */
 
 /*
@@ -217,6 +238,30 @@ static void __init omap3xxx_prm_enable_io_wakeup(void)
                                            PM_WKEN);
 }
 
+/**
+ * omap3xxx_prm_read_reset_sources - return the last SoC reset source
+ *
+ * Return a u32 representing the last reset sources of the SoC.  The
+ * returned reset source bits are standardized across OMAP SoCs.
+ */
+static u32 omap3xxx_prm_read_reset_sources(void)
+{
+        struct prm_reset_src_map *p;
+        u32 r = 0;
+        u32 v;
+
+        v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
+
+        p = omap3xxx_prm_reset_src_map;
+        while (p->reg_shift >= 0 && p->std_shift >= 0) {
+                if (v & (1 << p->reg_shift))
+                        r |= 1 << p->std_shift;
+                p++;
+        }
+
+        return r;
+}
+
 /* Powerdomain low-level functions */
 
 /* Applicable only for OMAP3. Not supported on OMAP2 */
@@ -320,6 +365,10 @@ struct pwrdm_ops omap3_pwrdm_operations = {
  *
  */
 
+static struct prm_ll_data omap3xxx_prm_ll_data = {
+        .read_reset_sources = &omap3xxx_prm_read_reset_sources,
+};
+
 static int __init omap3xxx_prm_init(void)
 {
         int ret;
@@ -327,12 +376,28 @@ static int __init omap3xxx_prm_init(void)
         if (!cpu_is_omap34xx())
                 return 0;
 
+        ret = prm_register(&omap3xxx_prm_ll_data);
+        if (ret)
+                return ret;
+
         omap3xxx_prm_enable_io_wakeup();
         ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
         if (!ret)
                 irq_set_status_flags(omap_prcm_event_to_irq("io"),
                                      IRQ_NOAUTOEN);
 
+
         return ret;
 }
 subsys_initcall(omap3xxx_prm_init);
+
+static void __exit omap3xxx_prm_exit(void)
+{
+        if (!cpu_is_omap34xx())
+                return;
+
+        /* Should never happen */
+        WARN(prm_unregister(&omap3xxx_prm_ll_data),
+             "%s: prm_ll_data function pointer mismatch\n", __func__);
+}
+__exitcall(omap3xxx_prm_exit);