carl9170 firmware: refactor timer functions

[carl9170fw.git] / carlfw / src / timer.c

diff --git a/carlfw/src/timer.c b/carlfw/src/timer.c
new file mode 100644 (file)
index 0000000..9505818
--- /dev/null
+++ b/carlfw/src/timer.c
@@ -0,0 +1,112 @@
+/*
+ * carl9170 firmware - used by the ar9170 wireless device
+ *
+ * timer code
+ *
+ * Copyright (c) 2000-2005 ZyDAS Technology Corporation
+ * Copyright (c) 2007-2009 Atheros Communications, Inc.
+ * Copyright   2009    Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009-2012 Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "carl9170.h"
+#include "timer.h"
+#include "gpio.h"
+#include "printf.h"
+#include "wl.h"
+
+void timer_init(const unsigned int timer, const unsigned int interval)
+{
+       /* Set timer to periodic mode */
+       orl(AR9170_TIMER_REG_CONTROL, BIT(timer));
+
+       /* Set time interval */
+       set(AR9170_TIMER_REG_TIMER0 + (timer << 2), interval - 1);
+
+       /* Clear timer interrupt flag */
+       orl(AR9170_TIMER_REG_INTERRUPT, BIT(timer));
+}
+
+void clock_set(enum cpu_clock_t clock_, bool on)
+{
+       /*
+        * Word of Warning!
+        * This setting does more than just mess with the CPU Clock.
+        * So watch out, if you need _stable_ timer interrupts.
+        */
+#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
+       if (fw.phy.frequency < 3000000)
+               set(AR9170_PWR_REG_PLL_ADDAC, 0x5163);
+       else
+               set(AR9170_PWR_REG_PLL_ADDAC, 0x5143);
+#else
+       set(AR9170_PWR_REG_PLL_ADDAC, 0x5163);
+#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
+
+       fw.ticks_per_usec = GET_VAL(AR9170_PWR_PLL_ADDAC_DIV,
+               get(AR9170_PWR_REG_PLL_ADDAC));
+
+       set(AR9170_PWR_REG_CLOCK_SEL, (uint32_t) ((on ? 0x70 : 0x600) | clock_));
+
+       switch (clock_) {
+       case AHB_20_22MHZ:
+               fw.ticks_per_usec >>= 1;
+       case AHB_40MHZ_OSC:
+       case AHB_40_44MHZ:
+               fw.ticks_per_usec >>= 1;
+       case AHB_80_88MHZ:
+               break;
+       }
+}
+
+static void timer0_isr(void)
+{
+       wlan_timer();
+
+#ifdef CONFIG_CARL9170FW_GPIO_INTERRUPT
+       gpio_timer();
+#endif /* CONFIG_CARL9170FW_GPIO_INTERRUPT */
+
+#ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
+       set(AR9170_GPIO_REG_PORT_DATA, get(AR9170_GPIO_REG_PORT_DATA) ^ 1);
+#endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
+}
+
+void handle_timer(void)
+{
+       uint32_t intr;
+
+       intr = get(AR9170_TIMER_REG_INTERRUPT);
+
+       /* ACK timer interrupt */
+       set(AR9170_TIMER_REG_INTERRUPT, intr);
+
+#define HANDLER(intr, flag, func)                      \
+       do {                                            \
+               if ((intr & flag) != 0) {               \
+                       intr &= ~flag;                  \
+                       func();                         \
+               }                                       \
+       } while (0)
+
+       HANDLER(intr, BIT(0), timer0_isr);
+
+       if (intr)
+               DBG("Unhandled Timer Event %x", (unsigned int) intr);
+
+#undef HANDLER
+}