1 files changed, 137 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-davinci/psc.c b/kernel/arch/arm/mach-davinci/psc.c
new file mode 100644
index 000000000..82fdc69d5
--- /dev/null
+++ b/kernel/arch/arm/mach-davinci/psc.c
@@ -0,0 +1,137 @@
+/*
+ * TI DaVinci Power and Sleep Controller (PSC)
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <mach/cputype.h>
+#include <mach/psc.h>
+
+#include "clock.h"
+
+/* Return nonzero iff the domain's clock is active */
+int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
+{
+	void __iomem *psc_base;
+	u32 mdstat;
+	struct davinci_soc_info *soc_info = &davinci_soc_info;
+
+	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
+		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
+				(int)soc_info->psc_bases, ctlr);
+		return 0;
+	}
+
+	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
+	mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
+	iounmap(psc_base);
+
+	/* if clocked, state can be "Enable" or "SyncReset" */
+	return mdstat & BIT(12);
+}
+
+/* Control "reset" line associated with PSC domain */
+void davinci_psc_reset(unsigned int ctlr, unsigned int id, bool reset)
+{
+	u32 mdctl;
+	void __iomem *psc_base;
+	struct davinci_soc_info *soc_info = &davinci_soc_info;
+
+	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
+		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
+				(int)soc_info->psc_bases, ctlr);
+		return;
+	}
+
+	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
+
+	mdctl = readl(psc_base + MDCTL + 4 * id);
+	if (reset)
+		mdctl &= ~MDCTL_LRST;
+	else
+		mdctl |= MDCTL_LRST;
+	writel(mdctl, psc_base + MDCTL + 4 * id);
+
+	iounmap(psc_base);
+}
+
+/* Enable or disable a PSC domain */
+void davinci_psc_config(unsigned int domain, unsigned int ctlr,
+		unsigned int id, bool enable, u32 flags)
+{
+	u32 epcpr, ptcmd, ptstat, pdstat, pdctl, mdstat, mdctl;
+	void __iomem *psc_base;
+	struct davinci_soc_info *soc_info = &davinci_soc_info;
+	u32 next_state = PSC_STATE_ENABLE;
+
+	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
+		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
+				(int)soc_info->psc_bases, ctlr);
+		return;
+	}
+
+	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
+
+	if (!enable) {
+		if (flags & PSC_SWRSTDISABLE)
+			next_state = PSC_STATE_SWRSTDISABLE;
+		else
+			next_state = PSC_STATE_DISABLE;
+	}
+
+	mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
+	mdctl &= ~MDSTAT_STATE_MASK;
+	mdctl |= next_state;
+	if (flags & PSC_FORCE)
+		mdctl |= MDCTL_FORCE;
+	__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
+
+	pdstat = __raw_readl(psc_base + PDSTAT + 4 * domain);
+	if ((pdstat & PDSTAT_STATE_MASK) == 0) {
+		pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
+		pdctl |= PDCTL_NEXT;
+		__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
+
+		ptcmd = 1 << domain;
+		__raw_writel(ptcmd, psc_base + PTCMD);
+
+		do {
+			epcpr = __raw_readl(psc_base + EPCPR);
+		} while ((((epcpr >> domain) & 1) == 0));
+
+		pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
+		pdctl |= PDCTL_EPCGOOD;
+		__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
+	} else {
+		ptcmd = 1 << domain;
+		__raw_writel(ptcmd, psc_base + PTCMD);
+	}
+
+	do {
+		ptstat = __raw_readl(psc_base + PTSTAT);
+	} while (!(((ptstat >> domain) & 1) == 0));
+
+	do {
+		mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
+	} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));
+
+	iounmap(psc_base);
+}