1 files changed, 98 insertions, 0 deletions
diff --git a/arch/avr32/cpu/at32ap700x/clk.c b/arch/avr32/cpu/at32ap700x/clk.c
new file mode 100644
index 0000000..742bc6b
--- /dev/null
+++ b/arch/avr32/cpu/at32ap700x/clk.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2005-2008 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#include <asm/io.h>
+
+#include <asm/arch/clk.h>
+#include <asm/arch/memory-map.h>
+#include <asm/arch/portmux.h>
+
+#include "sm.h"
+
+void clk_init(void)
+{
+	uint32_t cksel;
+
+	/* in case of soft resets, disable watchdog */
+	sm_writel(WDT_CTRL, SM_BF(KEY, 0x55));
+	sm_writel(WDT_CTRL, SM_BF(KEY, 0xaa));
+
+#ifdef CONFIG_PLL
+	/* Initialize the PLL */
+	sm_writel(PM_PLL0, (SM_BF(PLLCOUNT, CONFIG_SYS_PLL0_SUPPRESS_CYCLES)
+			    | SM_BF(PLLMUL, CONFIG_SYS_PLL0_MUL - 1)
+			    | SM_BF(PLLDIV, CONFIG_SYS_PLL0_DIV - 1)
+			    | SM_BF(PLLOPT, CONFIG_SYS_PLL0_OPT)
+			    | SM_BF(PLLOSC, 0)
+			    | SM_BIT(PLLEN)));
+
+	/* Wait for lock */
+	while (!(sm_readl(PM_ISR) & SM_BIT(LOCK0))) ;
+#endif
+
+	/* Set up clocks for the CPU and all peripheral buses */
+	cksel = 0;
+	if (CONFIG_SYS_CLKDIV_CPU)
+		cksel |= SM_BIT(CPUDIV) | SM_BF(CPUSEL, CONFIG_SYS_CLKDIV_CPU - 1);
+	if (CONFIG_SYS_CLKDIV_HSB)
+		cksel |= SM_BIT(HSBDIV) | SM_BF(HSBSEL, CONFIG_SYS_CLKDIV_HSB - 1);
+	if (CONFIG_SYS_CLKDIV_PBA)
+		cksel |= SM_BIT(PBADIV) | SM_BF(PBASEL, CONFIG_SYS_CLKDIV_PBA - 1);
+	if (CONFIG_SYS_CLKDIV_PBB)
+		cksel |= SM_BIT(PBBDIV) | SM_BF(PBBSEL, CONFIG_SYS_CLKDIV_PBB - 1);
+	sm_writel(PM_CKSEL, cksel);
+
+#ifdef CONFIG_PLL
+	/* Use PLL0 as main clock */
+	sm_writel(PM_MCCTRL, SM_BIT(PLLSEL));
+
+#ifdef CONFIG_LCD
+	/* Set up pixel clock for the LCDC */
+	sm_writel(PM_GCCTRL(7), SM_BIT(PLLSEL) | SM_BIT(CEN));
+#endif
+#endif
+}
+
+unsigned long __gclk_set_rate(unsigned int id, enum gclk_parent parent,
+		unsigned long rate, unsigned long parent_rate)
+{
+	unsigned long divider;
+
+	if (rate == 0 || parent_rate == 0) {
+		sm_writel(PM_GCCTRL(id), 0);
+		return 0;
+	}
+
+	divider = (parent_rate + rate / 2) / rate;
+	if (divider <= 1) {
+		sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN));
+		rate = parent_rate;
+	} else {
+		divider = min(255, divider / 2 - 1);
+		sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN) | SM_BIT(DIVEN)
+				| SM_BF(DIV, divider));
+		rate = parent_rate / (2 * (divider + 1));
+	}
+
+	return rate;
+}