[ARM] 4303/3: base kernel support for TI DaVinci

Add base kernel support for the TI DaVinci platform.

This patch only includes interrupts, timers, CPU identification,
serial support and basic power and sleep controller init.  More
drivers to come.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c
new file mode 100644
index 000000000000..e1b0050283a6
--- /dev/null
+++ b/arch/arm/mach-davinci/psc.c
@@ -0,0 +1,113 @@
+/*
+ * 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);
+}