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-rw-r--r--arch/arm/mach-davinci/psc.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c
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+++ b/arch/arm/mach-davinci/psc.c
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+/*
+ * 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/module.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/arch/psc.h>
+
+#define PTCMD __REG(0x01C41120)
+#define PDSTAT __REG(0x01C41200)
+#define PDCTL1 __REG(0x01C41304)
+#define EPCPR __REG(0x01C41070)
+#define PTSTAT __REG(0x01C41128)
+
+#define MDSTAT IO_ADDRESS(0x01C41800)
+#define MDCTL IO_ADDRESS(0x01C41A00)
+
+#define PINMUX0 __REG(0x01c40000)
+#define PINMUX1 __REG(0x01c40004)
+#define VDD3P3V_PWDN __REG(0x01C40048)
+
+static void davinci_psc_mux(unsigned int id)
+{
+ switch (id) {
+ case DAVINCI_LPSC_ATA:
+ PINMUX0 |= (1 << 17) | (1 << 16);
+ break;
+ case DAVINCI_LPSC_MMC_SD:
+ /* VDD power manupulations are done in U-Boot for CPMAC
+ * so applies to MMC as well
+ */
+ /*Set up the pull regiter for MMC */
+ VDD3P3V_PWDN = 0x0;
+ PINMUX1 &= (~(1 << 9));
+ break;
+ case DAVINCI_LPSC_I2C:
+ PINMUX1 |= (1 << 7);
+ break;
+ case DAVINCI_LPSC_McBSP:
+ PINMUX1 |= (1 << 10);
+ break;
+ default:
+ break;
+ }
+}
+
+/* Enable or disable a PSC domain */
+void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
+{
+ volatile unsigned int *mdstat = (unsigned int *)((int)MDSTAT + 4 * id);
+ volatile unsigned int *mdctl = (unsigned int *)((int)MDCTL + 4 * id);
+
+ if (id < 0)
+ return;
+
+ if (enable)
+ *mdctl |= 0x00000003; /* Enable Module */
+ else
+ *mdctl &= 0xFFFFFFF2; /* Disable Module */
+
+ if ((PDSTAT & 0x00000001) == 0) {
+ PDCTL1 |= 0x1;
+ PTCMD = (1 << domain);
+ while ((((EPCPR >> domain) & 1) == 0));
+
+ PDCTL1 |= 0x100;
+ while (!(((PTSTAT >> domain) & 1) == 0));
+ } else {
+ PTCMD = (1 << domain);
+ while (!(((PTSTAT >> domain) & 1) == 0));
+ }
+
+ if (enable)
+ while (!((*mdstat & 0x0000001F) == 0x3));
+ else
+ while (!((*mdstat & 0x0000001F) == 0x2));
+
+ if (enable)
+ davinci_psc_mux(id);
+}
+
+void __init davinci_psc_init(void)
+{
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
+
+ /* Turn on WatchDog timer LPSC. Needed for RESET to work */
+ davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);
+}