[ARM] 3567/2: arm: base support for Hilscher netX

Patch from Sascha Hauer

This patch adds the base support for Hilscher's netX network
processors.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 318 insertions, 0 deletions

diff --git a/arch/arm/mach-netx/Makefile b/arch/arm/mach-netx/Makefile
new file mode 100644
index 000000000000..257d02ef66d8
--- /dev/null
+++ b/arch/arm/mach-netx/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the linux kernel.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+
+# Object file lists.
+
+obj-y                   += time.o generic.o
+
diff --git a/arch/arm/mach-netx/Makefile.boot b/arch/arm/mach-netx/Makefile.boot
new file mode 100644
index 000000000000..b81cf6aff0ac
--- /dev/null
+++ b/arch/arm/mach-netx/Makefile.boot
@@ -0,0 +1,2 @@
+    zreladdr-y                  := 0x80008000
+
diff --git a/arch/arm/mach-netx/generic.c b/arch/arm/mach-netx/generic.c
new file mode 100644
index 000000000000..af0b13534cfd
--- /dev/null
+++ b/arch/arm/mach-netx/generic.c
@@ -0,0 +1,193 @@
+/*
+ * arch/arm/mach-netx/generic.c
+ *
+ * Copyright (C) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <asm/hardware.h>
+#include <asm/mach/map.h>
+#include <asm/hardware/vic.h>
+#include <asm/io.h>
+#include <asm/arch/netx-regs.h>
+#include <asm/mach/irq.h>
+
+static struct map_desc netx_io_desc[] __initdata = {
+        {
+                .virtual        = NETX_IO_VIRT,
+                .pfn            = __phys_to_pfn(NETX_IO_PHYS),
+                .length         = NETX_IO_SIZE,
+                .type           = MT_DEVICE
+        }
+};
+
+void __init netx_map_io(void)
+{
+        iotable_init(netx_io_desc, ARRAY_SIZE(netx_io_desc));
+}
+
+static struct resource netx_rtc_resources[] = {
+        [0] = {
+                .start  = 0x00101200,
+                .end    = 0x00101220,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device netx_rtc_device = {
+        .name           = "netx-rtc",
+        .id             = 0,
+        .num_resources  = ARRAY_SIZE(netx_rtc_resources),
+        .resource       = netx_rtc_resources,
+};
+
+static struct platform_device *devices[] __initdata = {
+        &netx_rtc_device,
+};
+
+#if 0
+#define DEBUG_IRQ(fmt...)       printk(fmt)
+#else
+#define DEBUG_IRQ(fmt...)       while (0) {}
+#endif
+
+static void
+netx_hif_demux_handler(unsigned int irq_unused, struct irqdesc *desc,
+                        struct pt_regs *regs)
+{
+        unsigned int irq = NETX_IRQ_HIF_CHAINED(0);
+        unsigned int stat;
+
+        stat = ((readl(NETX_DPMAS_INT_EN) &
+                readl(NETX_DPMAS_INT_STAT)) >> 24) & 0x1f;
+
+        desc = irq_desc + NETX_IRQ_HIF_CHAINED(0);
+
+        while (stat) {
+                if (stat & 1) {
+                        DEBUG_IRQ("handling irq %d\n", irq);
+                        desc_handle_irq(irq, desc, regs);
+                }
+                irq++;
+                desc++;
+                stat >>= 1;
+        }
+}
+
+static int
+netx_hif_irq_type(unsigned int _irq, unsigned int type)
+{
+        unsigned int val, irq;
+
+        val = readl(NETX_DPMAS_IF_CONF1);
+
+        irq = _irq - NETX_IRQ_HIF_CHAINED(0);
+
+        if (type & __IRQT_RISEDGE) {
+                DEBUG_IRQ("rising edges\n");
+                val |= (1 << 26) << irq;
+        }
+        if (type & __IRQT_FALEDGE) {
+                DEBUG_IRQ("falling edges\n");
+                val &= ~((1 << 26) << irq);
+        }
+        if (type & __IRQT_LOWLVL) {
+                DEBUG_IRQ("low level\n");
+                val &= ~((1 << 26) << irq);
+        }
+        if (type & __IRQT_HIGHLVL) {
+                DEBUG_IRQ("high level\n");
+                val |= (1 << 26) << irq;
+        }
+
+        writel(val, NETX_DPMAS_IF_CONF1);
+
+        return 0;
+}
+
+static void
+netx_hif_ack_irq(unsigned int _irq)
+{
+        unsigned int val, irq;
+
+        irq = _irq - NETX_IRQ_HIF_CHAINED(0);
+        writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);
+
+        val = readl(NETX_DPMAS_INT_EN);
+        val &= ~((1 << 24) << irq);
+        writel(val, NETX_DPMAS_INT_EN);
+
+        DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
+}
+
+static void
+netx_hif_mask_irq(unsigned int _irq)
+{
+        unsigned int val, irq;
+
+        irq = _irq - NETX_IRQ_HIF_CHAINED(0);
+        val = readl(NETX_DPMAS_INT_EN);
+        val &= ~((1 << 24) << irq);
+        writel(val, NETX_DPMAS_INT_EN);
+        DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
+}
+
+static void
+netx_hif_unmask_irq(unsigned int _irq)
+{
+        unsigned int val, irq;
+
+        irq = _irq - NETX_IRQ_HIF_CHAINED(0);
+        val = readl(NETX_DPMAS_INT_EN);
+        val |= (1 << 24) << irq;
+        writel(val, NETX_DPMAS_INT_EN);
+        DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
+}
+
+static struct irqchip netx_hif_chip = {
+        .ack = netx_hif_ack_irq,
+        .mask = netx_hif_mask_irq,
+        .unmask = netx_hif_unmask_irq,
+        .set_type = netx_hif_irq_type,
+};
+
+void __init netx_init_irq(void)
+{
+        int irq;
+
+        vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0);
+
+        for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
+                set_irq_chip(irq, &netx_hif_chip);
+                set_irq_handler(irq, do_level_IRQ);
+                set_irq_flags(irq, IRQF_VALID);
+        }
+
+        writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
+        set_irq_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
+}
+
+static int __init netx_init(void)
+{
+        return platform_add_devices(devices, ARRAY_SIZE(devices));
+}
+
+subsys_initcall(netx_init);
+
diff --git a/arch/arm/mach-netx/generic.h b/arch/arm/mach-netx/generic.h
new file mode 100644
index 000000000000..ede2d35341c3
--- /dev/null
+++ b/arch/arm/mach-netx/generic.h
@@ -0,0 +1,24 @@
+/*
+ * arch/arm/mach-netx/generic.h
+ *
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+extern void __init netx_map_io(void);
+extern void __init netx_init_irq(void);
+
+struct sys_timer;
+extern struct sys_timer netx_timer;
diff --git a/arch/arm/mach-netx/time.c b/arch/arm/mach-netx/time.c
new file mode 100644
index 000000000000..edfbdf40c600
--- /dev/null
+++ b/arch/arm/mach-netx/time.c
@@ -0,0 +1,88 @@
+/*
+ * arch/arm/mach-netx/time.c
+ *
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach/time.h>
+#include <asm/arch/netx-regs.h>
+
+/*
+ * Returns number of us since last clock interrupt.  Note that interrupts
+ * will have been disabled by do_gettimeoffset()
+ */
+static unsigned long netx_gettimeoffset(void)
+{
+        return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100;
+}
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t
+netx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        write_seqlock(&xtime_lock);
+
+        timer_tick(regs);
+        write_sequnlock(&xtime_lock);
+
+        /* acknowledge interrupt */
+        writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
+
+        return IRQ_HANDLED;
+}
+
+
+static struct irqaction netx_timer_irq = {
+        .name           = "NetX Timer Tick",
+        .flags          = SA_INTERRUPT | SA_TIMER,
+        .handler        = netx_timer_interrupt,
+};
+
+/*
+ * Set up timer interrupt
+ */
+static void __init netx_timer_init(void)
+{
+        /* disable timer initially */
+        writel(0, NETX_GPIO_COUNTER_CTRL(0));
+
+        /* Reset the timer value to zero */
+        writel(0, NETX_GPIO_COUNTER_CURRENT(0));
+
+        writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
+
+        /* acknowledge interrupt */
+        writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
+
+        /* Enable the interrupt in the specific timer register and start timer */
+        writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
+        writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
+                NETX_GPIO_COUNTER_CTRL(0));
+
+        setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
+}
+
+struct sys_timer netx_timer = {
+        .init           = netx_timer_init,
+        .offset         = netx_gettimeoffset,
+};