Merge with /home/wd/git/u-boot/mailing-list/Haavard_Skinnemoen

1 files changed, 163 insertions, 0 deletions

diff --git a/cpu/at32ap/pm.c b/cpu/at32ap/pm.c
new file mode 100644
index 0000000..01ac325
--- /dev/null
+++ b/cpu/at32ap/pm.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2006 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>
+
+#ifdef CFG_POWER_MANAGER
+#include <asm/errno.h>
+#include <asm/io.h>
+
+#include <asm/arch/memory-map.h>
+#include <asm/arch/platform.h>
+
+#include "sm.h"
+
+/* Sanity checks */
+#if (CFG_CLKDIV_CPU > CFG_CLKDIV_HSB)		\
+	|| (CFG_CLKDIV_HSB > CFG_CLKDIV_PBA)	\
+	|| (CFG_CLKDIV_HSB > CFG_CLKDIV_PBB)
+# error Constraint fCPU >= fHSB >= fPB{A,B} violated
+#endif
+#if defined(CONFIG_PLL) && ((CFG_PLL0_MUL < 1) || (CFG_PLL0_DIV < 1))
+# error Invalid PLL multiplier and/or divider
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct clock_domain_state {
+	const struct device *bridge;
+	unsigned long freq;
+	u32 mask;
+};
+static struct clock_domain_state ckd_state[NR_CLOCK_DOMAINS];
+
+int pm_enable_clock(enum clock_domain_id id, unsigned int index)
+{
+	const struct clock_domain *ckd = &chip_clock[id];
+	struct clock_domain_state *state = &ckd_state[id];
+
+	if (ckd->bridge != NO_DEVICE) {
+		state->bridge = get_device(ckd->bridge);
+		if (!state->bridge)
+			return -EBUSY;
+	}
+
+	state->mask |= 1 << index;
+	if (gd->sm)
+		writel(state->mask, gd->sm->regs + ckd->reg);
+
+	return 0;
+}
+
+void pm_disable_clock(enum clock_domain_id id, unsigned int index)
+{
+	const struct clock_domain *ckd = &chip_clock[id];
+	struct clock_domain_state *state = &ckd_state[id];
+
+	state->mask &= ~(1 << index);
+	if (gd->sm)
+		writel(state->mask, gd->sm->regs + ckd->reg);
+
+	if (ckd->bridge)
+		put_device(state->bridge);
+}
+
+unsigned long pm_get_clock_freq(enum clock_domain_id domain)
+{
+	return ckd_state[domain].freq;
+}
+
+void pm_init(void)
+{
+	uint32_t cksel = 0;
+	unsigned long main_clock;
+
+	/* Make sure we don't disable any device we're already using */
+	get_device(DEVICE_HRAMC);
+	get_device(DEVICE_HEBI);
+
+	/* Enable the PICO as well */
+	ckd_state[CLOCK_CPU].mask |= 1;
+
+	gd->sm = get_device(DEVICE_SM);
+	if (!gd->sm)
+		panic("Unable to claim system manager device!\n");
+
+	/* Disable any devices that haven't been explicitly claimed */
+	sm_writel(gd->sm, PM_PBB_MASK, ckd_state[CLOCK_PBB].mask);
+	sm_writel(gd->sm, PM_PBA_MASK, ckd_state[CLOCK_PBA].mask);
+	sm_writel(gd->sm, PM_HSB_MASK, ckd_state[CLOCK_HSB].mask);
+	sm_writel(gd->sm, PM_CPU_MASK, ckd_state[CLOCK_CPU].mask);
+
+#ifdef CONFIG_PLL
+	/* Initialize the PLL */
+	main_clock = (CFG_OSC0_HZ / CFG_PLL0_DIV) * CFG_PLL0_MUL;
+
+	sm_writel(gd->sm, PM_PLL0, (SM_BF(PLLCOUNT, CFG_PLL0_SUPPRESS_CYCLES)
+				    | SM_BF(PLLMUL, CFG_PLL0_MUL - 1)
+				    | SM_BF(PLLDIV, CFG_PLL0_DIV - 1)
+				    | SM_BF(PLLOPT, CFG_PLL0_OPT)
+				    | SM_BF(PLLOSC, 0)
+				    | SM_BIT(PLLEN)));
+
+	/* Wait for lock */
+	while (!(sm_readl(gd->sm, PM_ISR) & SM_BIT(LOCK0))) ;
+#else
+	main_clock = CFG_OSC0_HZ;
+#endif
+
+	/* Set up clocks for the CPU and all peripheral buses */
+	if (CFG_CLKDIV_CPU) {
+		cksel |= SM_BIT(CPUDIV) | SM_BF(CPUSEL, CFG_CLKDIV_CPU - 1);
+		ckd_state[CLOCK_CPU].freq = main_clock / (1 << CFG_CLKDIV_CPU);
+	} else {
+		ckd_state[CLOCK_CPU].freq = main_clock;
+	}
+	if (CFG_CLKDIV_HSB) {
+		cksel |= SM_BIT(HSBDIV) | SM_BF(HSBSEL, CFG_CLKDIV_HSB - 1);
+		ckd_state[CLOCK_HSB].freq = main_clock / (1 << CFG_CLKDIV_HSB);
+	} else {
+		ckd_state[CLOCK_HSB].freq = main_clock;
+	}
+	if (CFG_CLKDIV_PBA) {
+		cksel |= SM_BIT(PBADIV) | SM_BF(PBASEL, CFG_CLKDIV_PBA - 1);
+		ckd_state[CLOCK_PBA].freq = main_clock / (1 << CFG_CLKDIV_PBA);
+	} else {
+		ckd_state[CLOCK_PBA].freq = main_clock;
+	}
+	if (CFG_CLKDIV_PBB) {
+		cksel |= SM_BIT(PBBDIV) | SM_BF(PBBSEL, CFG_CLKDIV_PBB - 1);
+		ckd_state[CLOCK_PBB].freq = main_clock / (1 << CFG_CLKDIV_PBB);
+	} else {
+		ckd_state[CLOCK_PBB].freq = main_clock;
+	}
+	sm_writel(gd->sm, PM_CKSEL, cksel);
+
+	/* CFG_HZ currently depends on cpu_hz */
+	gd->cpu_hz = ckd_state[CLOCK_CPU].freq;
+
+#ifdef CONFIG_PLL
+	/* Use PLL0 as main clock */
+	sm_writel(gd->sm, PM_MCCTRL, SM_BIT(PLLSEL));
+#endif
+}
+
+#endif /* CFG_POWER_MANAGER */