[ARM] 4432/5: davinci: pin mux support

Support pin multiplexing configurations driver for TI DaVinci SoC

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

3 files changed, 99 insertions, 31 deletions

diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index 731c0a6d5176..99ac2e55774d 100644
--- a/arch/arm/mach-davinci/Makefile
+++ b/arch/arm/mach-davinci/Makefile
@@ -5,7 +5,7 @@
 
 # Common objects
 obj-y                   := time.o irq.o clock.o serial.o io.o id.o psc.o \
-                           gpio.o
+                           gpio.o mux.o
 
 # Board specific
 obj-$(CONFIG_MACH_DAVINCI_EVM)  += board-evm.o
diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
new file mode 100644
index 000000000000..92d26bd305b7
--- /dev/null
+++ b/arch/arm/mach-davinci/mux.c
@@ -0,0 +1,41 @@
+/*
+ * DaVinci pin multiplexing configurations
+ *
+ * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#include <asm/hardware.h>
+
+#include <asm/arch/mux.h>
+
+/* System control register offsets */
+#define PINMUX0         0x00
+#define PINMUX1         0x04
+
+static DEFINE_SPINLOCK(mux_lock);
+
+void davinci_mux_peripheral(unsigned int mux, unsigned int enable)
+{
+        u32 pinmux, muxreg = PINMUX0;
+
+        if (mux >= DAVINCI_MUX_LEVEL2) {
+                muxreg = PINMUX1;
+                mux -= DAVINCI_MUX_LEVEL2;
+        }
+
+        spin_lock(&mux_lock);
+        pinmux = davinci_readl(DAVINCI_SYSTEM_MODULE_BASE + muxreg);
+        if (enable)
+                pinmux |= (1 << mux);
+        else
+                pinmux &= ~(1 << mux);
+        davinci_writel(pinmux, DAVINCI_SYSTEM_MODULE_BASE + muxreg);
+        spin_unlock(&mux_lock);
+}
diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c
index e1b0050283a6..1334416559ad 100644
--- a/arch/arm/mach-davinci/psc.c
+++ b/arch/arm/mach-davinci/psc.c
@@ -25,39 +25,40 @@
 #include <asm/io.h>
 #include <asm/hardware.h>
 #include <asm/arch/psc.h>
+#include <asm/arch/mux.h>
 
-#define PTCMD        __REG(0x01C41120)
-#define PDSTAT       __REG(0x01C41200)
-#define PDCTL1       __REG(0x01C41304)
-#define EPCPR        __REG(0x01C41070)
-#define PTSTAT       __REG(0x01C41128)
+/* PSC register offsets */
+#define EPCPR           0x070
+#define PTCMD           0x120
+#define PTSTAT          0x128
+#define PDSTAT          0x200
+#define PDCTL1          0x304
+#define MDSTAT          0x800
+#define MDCTL           0xA00
 
-#define MDSTAT       IO_ADDRESS(0x01C41800)
-#define MDCTL        IO_ADDRESS(0x01C41A00)
-
-#define PINMUX0      __REG(0x01c40000)
-#define PINMUX1      __REG(0x01c40004)
-#define VDD3P3V_PWDN __REG(0x01C40048)
+/* System control register offsets */
+#define VDD3P3V_PWDN    0x48
 
 static void davinci_psc_mux(unsigned int id)
 {
         switch (id) {
         case DAVINCI_LPSC_ATA:
-                PINMUX0 |= (1 << 17) | (1 << 16);
+                davinci_mux_peripheral(DAVINCI_MUX_HDIREN, 1);
+                davinci_mux_peripheral(DAVINCI_MUX_ATAEN, 1);
                 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));
+                davinci_writel(0, DAVINCI_SYSTEM_MODULE_BASE + VDD3P3V_PWDN);
+                davinci_mux_peripheral(DAVINCI_MUX_MSTK, 0);
                 break;
         case DAVINCI_LPSC_I2C:
-                PINMUX1 |= (1 << 7);
+                davinci_mux_peripheral(DAVINCI_MUX_I2C, 1);
                 break;
         case DAVINCI_LPSC_McBSP:
-                PINMUX1 |= (1 << 10);
+                davinci_mux_peripheral(DAVINCI_MUX_ASP, 1);
                 break;
         default:
                 break;
@@ -67,33 +68,59 @@ static void davinci_psc_mux(unsigned int id)
 /* 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);
+        u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl, mdstat_mask;
 
         if (id < 0)
                 return;
 
+        mdctl = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
         if (enable)
-                *mdctl |= 0x00000003;   /* Enable Module */
+                mdctl |= 0x00000003;    /* Enable Module */
         else
-                *mdctl &= 0xFFFFFFF2;   /* Disable Module */
+                mdctl &= 0xFFFFFFF2;    /* Disable Module */
+        davinci_writel(mdctl, DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
+
+        pdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDSTAT);
+        if ((pdstat & 0x00000001) == 0) {
+                pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+                pdctl1 |= 0x1;
+                davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+
+                ptcmd = 1 << domain;
+                davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
 
-        if ((PDSTAT & 0x00000001) == 0) {
-                PDCTL1 |= 0x1;
-                PTCMD = (1 << domain);
-                while ((((EPCPR >> domain) & 1) == 0));
+                do {
+                        epcpr = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
+                                              EPCPR);
+                } while ((((epcpr >> domain) & 1) == 0));
 
-                PDCTL1 |= 0x100;
-                while (!(((PTSTAT >> domain) & 1) == 0));
+                pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+                pdctl1 |= 0x100;
+                davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+
+                do {
+                        ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
+                                               PTSTAT);
+                } while (!(((ptstat >> domain) & 1) == 0));
         } else {
-                PTCMD = (1 << domain);
-                while (!(((PTSTAT >> domain) & 1) == 0));
+                ptcmd = 1 << domain;
+                davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
+
+                do {
+                        ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
+                                               PTSTAT);
+                } while (!(((ptstat >> domain) & 1) == 0));
         }
 
         if (enable)
-                while (!((*mdstat & 0x0000001F) == 0x3));
+                mdstat_mask = 0x3;
         else
-                while (!((*mdstat & 0x0000001F) == 0x2));
+                mdstat_mask = 0x2;
+
+        do {
+                mdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
+                                       MDSTAT + 4 * id);
+        } while (!((mdstat & 0x0000001F) == mdstat_mask));
 
         if (enable)
                 davinci_psc_mux(id);