1 files changed, 64 insertions, 0 deletions
diff --git a/bsps/arm/beagle/pwmss/pwmss.c b/bsps/arm/beagle/pwmss/pwmss.c
new file mode 100644
index 0000000000..c4d36d8ae1
--- /dev/null
+++ b/bsps/arm/beagle/pwmss/pwmss.c
@@ -0,0 +1,64 @@
+/**
+ * @file
+ *
+ * @ingroup arm_beagle
+ *
+ * @brief Support for eQEP for the BeagleBone Black.
+ */
+
+/**
+ * Copyright (c) 2020 James Fitzsimons <james.fitzsimons@gmail.com>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <libcpu/am335x.h>
+#include <stdio.h>
+#include <bsp.h>
+#include <bsp/pwmss.h>
+#include <bsp/beagleboneblack.h>
+
+
+/**
+ * @brief   This function configures the L3 and L4_PER system clocks.
+ *          It also configures the system clocks for the specified ePWMSS
+ *          instance.
+ *
+ * @param   pwmss_id    The instance number of ePWMSS whose system clocks
+ *                         have to be configured.
+ *
+ * 'pwmss_id' can take one of the following values:
+ * (0 <= pwmss_id <= 2)
+ *
+ * @return  True if successful
+ *          False if Unsuccessful
+ */
+rtems_status_code pwmss_module_clk_config(BBB_PWMSS pwmss_id)
+{
+    uint32_t clkctrl;
+
+    /* calculate the address of the clock control register for the PWMSS
+     * module we are configuring */
+    if(pwmss_id == BBB_PWMSS0) {
+        clkctrl = AM335X_CM_PER_ADDR + AM335X_CM_PER_EPWMSS0_CLKCTRL;
+    } else if(pwmss_id == BBB_PWMSS1) {
+        clkctrl = AM335X_CM_PER_ADDR + AM335X_CM_PER_EPWMSS1_CLKCTRL;
+    } else if(pwmss_id == BBB_PWMSS2) {
+        clkctrl = AM335X_CM_PER_ADDR + AM335X_CM_PER_EPWMSS2_CLKCTRL;
+    }
+
+    /* when the module is functional the IDLEST bits (16 -17) of the
+     * CM_PER_EPWMSSx_CLKCTRL register will be 0x0. */
+    const uint32_t is_functional = 0x0;
+    const uint32_t idle_bits = AM335X_CM_PER_EPWMSSx_CLKCTRL_IDLEST;
+    const uint32_t is_enable = AM335X_CM_PER_EPWMSSx_CLKCTRL_MODULEMODE_ENABLE;
+    const uint32_t module_mode = AM335X_CM_PER_EPWMSSx_CLKCTRL_MODULEMODE;
+
+    REG(clkctrl) |= is_enable;
+    while((REG(clkctrl) & module_mode) != is_enable);
+    while((REG(clkctrl) & idle_bits) != is_functional);
+
+    return RTEMS_SUCCESSFUL;
+}