Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-omap1 / reset.c

diff --git a/kernel/arch/arm/mach-omap1/reset.c b/kernel/arch/arm/mach-omap1/reset.c
new file mode 100644 (file)
index 0000000..72bf4bf
--- /dev/null
+++ b/kernel/arch/arm/mach-omap1/reset.c
@@ -0,0 +1,63 @@
+/*
+ * OMAP1 reset support
+ */
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/reboot.h>
+
+#include <mach/hardware.h>
+
+#include "iomap.h"
+#include "common.h"
+
+/* ARM_SYSST bit shifts related to SoC reset sources */
+#define ARM_SYSST_POR_SHIFT                            5
+#define ARM_SYSST_EXT_RST_SHIFT                                4
+#define ARM_SYSST_ARM_WDRST_SHIFT                      2
+#define ARM_SYSST_GLOB_SWRST_SHIFT                     1
+
+/* Standardized reset source bits (across all OMAP SoCs) */
+#define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT              0
+#define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT              1
+#define OMAP_MPU_WD_RST_SRC_ID_SHIFT                   3
+#define OMAP_EXTWARM_RST_SRC_ID_SHIFT                  5
+
+
+void omap1_restart(enum reboot_mode mode, const char *cmd)
+{
+       /*
+        * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
+        * "Global Software Reset Affects Traffic Controller Frequency".
+        */
+       if (cpu_is_omap5912()) {
+               omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
+               omap_writew(0x8, ARM_RSTCT1);
+       }
+
+       omap_writew(1, ARM_RSTCT1);
+}
+
+/**
+ * omap1_get_reset_sources - return the source of the SoC's last reset
+ *
+ * Returns bits that represent the last reset source for the SoC.  The
+ * format is standardized across OMAPs for use by the OMAP watchdog.
+ */
+u32 omap1_get_reset_sources(void)
+{
+       u32 ret = 0;
+       u16 rs;
+
+       rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST));
+
+       if (rs & (1 << ARM_SYSST_POR_SHIFT))
+               ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT;
+       if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT))
+               ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT;
+       if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT))
+               ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT;
+       if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT))
+               ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT;
+
+       return ret;
+}