GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/mach-davinci/psc.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Power and Sleep Controller (PSC) functions.
+ *
+ * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ * Copyright (C) 2008 Lyrtech <www.lyrtech.com>
+ * Copyright (C) 2004 Texas Instruments.
+ */
+
+#include <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+
+/*
+ * The PSC manages three inputs to a "module" which may be a peripheral or
+ * CPU.  Those inputs are the module's:  clock; reset signal; and sometimes
+ * its power domain.  For our purposes, we only care whether clock and power
+ * are active, and the module is out of reset.
+ *
+ * DaVinci chips may include two separate power domains: "Always On" and "DSP".
+ * Chips without a DSP generally have only one domain.
+ *
+ * The "Always On" power domain is always on when the chip is on, and is
+ * powered by the VDD pins (on DM644X). The majority of DaVinci modules
+ * lie within the "Always On" power domain.
+ *
+ * A separate domain called the "DSP" domain houses the C64x+ and other video
+ * hardware such as VICP. In some chips, the "DSP" domain is not always on.
+ * The "DSP" power domain is powered by the CVDDDSP pins (on DM644X).
+ */
+
+/* Works on Always On power domain only (no PD argument) */
+static void lpsc_transition(unsigned int id, unsigned int state)
+{
+	dv_reg_p mdstat, mdctl, ptstat, ptcmd;
+	struct davinci_psc_regs *psc_regs;
+
+	if (id < DAVINCI_LPSC_PSC1_BASE) {
+		if (id >= PSC_PSC0_MODULE_ID_CNT)
+			return;
+		psc_regs = davinci_psc0_regs;
+		mdstat = &psc_regs->psc0.mdstat[id];
+		mdctl = &psc_regs->psc0.mdctl[id];
+	} else {
+		id -= DAVINCI_LPSC_PSC1_BASE;
+		if (id >= PSC_PSC1_MODULE_ID_CNT)
+			return;
+		psc_regs = davinci_psc1_regs;
+		mdstat = &psc_regs->psc1.mdstat[id];
+		mdctl = &psc_regs->psc1.mdctl[id];
+	}
+	ptstat = &psc_regs->ptstat;
+	ptcmd = &psc_regs->ptcmd;
+
+	while (readl(ptstat) & 0x01)
+		continue;
+
+	if ((readl(mdstat) & PSC_MDSTAT_STATE) == state)
+		return; /* Already in that state */
+
+	writel((readl(mdctl) & ~PSC_MDCTL_NEXT) | state, mdctl);
+	writel(0x01, ptcmd);
+
+	while (readl(ptstat) & 0x01)
+		continue;
+	while ((readl(mdstat) & PSC_MDSTAT_STATE) != state)
+		continue;
+}
+
+void lpsc_on(unsigned int id)
+{
+	lpsc_transition(id, 0x03);
+}
+
+void lpsc_syncreset(unsigned int id)
+{
+	lpsc_transition(id, 0x01);
+}
+
+void lpsc_disable(unsigned int id)
+{
+	lpsc_transition(id, 0x0);
+}