ARM: S3C2416: Add arch support

Add arch/arm/mach-s3c2416 for support of the Samsung S3C2416 SoC.

This patch adds support of the S3C2416 SoC, clocks, timers,
and initial IRQ support (without support of secondary set of registers).

Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
[ben-linux@fluff.org: removed files to be reworked, fixed conflicts]
[ben-linux@fluff.org: use s3c2443 reset instead of specific reset code]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

4 files changed, 412 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2416/Kconfig b/arch/arm/mach-s3c2416/Kconfig
new file mode 100644
index 000000000000..cc320f6b7372
--- /dev/null
+++ b/arch/arm/mach-s3c2416/Kconfig
@@ -0,0 +1,25 @@
+# arch/arm/mach-s3c2416/Kconfig
+#
+# Copyright 2009 Yauhen Kharuzhy <jekhor@gmail.com>
+#
+# Licensed under GPLv2
+
+config CPU_S3C2416
+        bool
+        depends on ARCH_S3C2410
+        select CPU_ARM926T
+        select S3C2416_DMA if S3C2410_DMA
+        select CPU_LLSERIAL_S3C2440
+        help
+          Support for the S3C2416 SoC from the S3C24XX line
+
+config S3C2416_DMA
+        bool
+        depends on CPU_S3C2416
+        help
+          Internal config node for S3C2416 DMA support
+
+menu "S3C2416 Machines"
+
+
+endmenu
diff --git a/arch/arm/mach-s3c2416/Makefile b/arch/arm/mach-s3c2416/Makefile
new file mode 100644
index 000000000000..34bb70d44d50
--- /dev/null
+++ b/arch/arm/mach-s3c2416/Makefile
@@ -0,0 +1,18 @@
+# arch/arm/mach-s3c2416/Makefile
+#
+# Copyright 2009 Yauhen Kharuzhy <jekhor@gmail.com>
+#
+# Licensed under GPLv2
+
+obj-y                           :=
+obj-m                           :=
+obj-n                           :=
+obj-                            :=
+
+obj-$(CONFIG_CPU_S3C2416)       += s3c2416.o
+obj-$(CONFIG_CPU_S3C2416)       += irq.o
+
+#obj-$(CONFIG_S3C2416_DMA)      += dma.o
+
+# Machine support
+
diff --git a/arch/arm/mach-s3c2416/irq.c b/arch/arm/mach-s3c2416/irq.c
new file mode 100644
index 000000000000..89f521d59d06
--- /dev/null
+++ b/arch/arm/mach-s3c2416/irq.c
@@ -0,0 +1,254 @@
+/* linux/arch/arm/mach-s3c2416/irq.c
+ *
+ * Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
+ *      as part of OpenInkpot project
+ * Copyright (c) 2009 Promwad Innovation Company
+ *      Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/sysdev.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include <asm/mach/irq.h>
+
+#include <mach/regs-irq.h>
+#include <mach/regs-gpio.h>
+
+#include <plat/cpu.h>
+#include <plat/pm.h>
+#include <plat/irq.h>
+
+#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
+
+static inline void s3c2416_irq_demux(unsigned int irq, unsigned int len)
+{
+        unsigned int subsrc, submsk;
+        unsigned int end;
+
+        /* read the current pending interrupts, and the mask
+         * for what it is available */
+
+        subsrc = __raw_readl(S3C2410_SUBSRCPND);
+        submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+        subsrc  &= ~submsk;
+        subsrc >>= (irq - S3C2410_IRQSUB(0));
+        subsrc  &= (1 << len)-1;
+
+        end = len + irq;
+
+        for (; irq < end && subsrc; irq++) {
+                if (subsrc & 1)
+                        generic_handle_irq(irq);
+
+                subsrc >>= 1;
+        }
+}
+
+/* WDT/AC97 sub interrupts */
+
+static void s3c2416_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_WDT, 4);
+}
+
+#define INTMSK_WDTAC97  (1UL << (IRQ_WDT - IRQ_EINT0))
+#define SUBMSK_WDTAC97  INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
+
+static void s3c2416_irq_wdtac97_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static void s3c2416_irq_wdtac97_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_WDTAC97);
+}
+
+static void s3c2416_irq_wdtac97_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static struct irq_chip s3c2416_irq_wdtac97 = {
+        .mask       = s3c2416_irq_wdtac97_mask,
+        .unmask     = s3c2416_irq_wdtac97_unmask,
+        .ack        = s3c2416_irq_wdtac97_ack,
+};
+
+
+/* LCD sub interrupts */
+
+static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
+}
+
+#define INTMSK_LCD      (1UL << (IRQ_LCD - IRQ_EINT0))
+#define SUBMSK_LCD      INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
+
+static void s3c2416_irq_lcd_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static void s3c2416_irq_lcd_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_LCD);
+}
+
+static void s3c2416_irq_lcd_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static struct irq_chip s3c2416_irq_lcd = {
+        .mask       = s3c2416_irq_lcd_mask,
+        .unmask     = s3c2416_irq_lcd_unmask,
+        .ack        = s3c2416_irq_lcd_ack,
+};
+
+
+/* DMA sub interrupts */
+
+static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
+}
+
+#define INTMSK_DMA      (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
+#define SUBMSK_DMA      INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
+
+
+static void s3c2416_irq_dma_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static void s3c2416_irq_dma_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_DMA);
+}
+
+static void s3c2416_irq_dma_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static struct irq_chip s3c2416_irq_dma = {
+        .mask       = s3c2416_irq_dma_mask,
+        .unmask     = s3c2416_irq_dma_unmask,
+        .ack        = s3c2416_irq_dma_ack,
+};
+
+
+/* UART3 sub interrupts */
+
+static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
+{
+        s3c2416_irq_demux(IRQ_S3C2443_UART3, 3);
+}
+
+#define INTMSK_UART3    (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
+#define SUBMSK_UART3    (0xf << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
+
+
+static void s3c2416_irq_uart3_mask(unsigned int irqno)
+{
+        s3c_irqsub_mask(irqno, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static void s3c2416_irq_uart3_unmask(unsigned int irqno)
+{
+        s3c_irqsub_unmask(irqno, INTMSK_UART3);
+}
+
+static void s3c2416_irq_uart3_ack(unsigned int irqno)
+{
+        s3c_irqsub_maskack(irqno, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static struct irq_chip s3c2416_irq_uart3 = {
+        .mask       = s3c2416_irq_uart3_mask,
+        .unmask     = s3c2416_irq_uart3_unmask,
+        .ack        = s3c2416_irq_uart3_ack,
+};
+
+
+/* IRQ initialisation code */
+
+static int __init s3c2416_add_sub(unsigned int base,
+                                   void (*demux)(unsigned int,
+                                                 struct irq_desc *),
+                                   struct irq_chip *chip,
+                                   unsigned int start, unsigned int end)
+{
+        unsigned int irqno;
+
+        set_irq_chip(base, &s3c_irq_level_chip);
+        set_irq_handler(base, handle_level_irq);
+        set_irq_chained_handler(base, demux);
+
+        for (irqno = start; irqno <= end; irqno++) {
+                set_irq_chip(irqno, chip);
+                set_irq_handler(irqno, handle_level_irq);
+                set_irq_flags(irqno, IRQF_VALID);
+        }
+
+        return 0;
+}
+
+static int __init s3c2416_irq_add(struct sys_device *sysdev)
+{
+        printk(KERN_INFO "S3C2416: IRQ Support\n");
+
+        s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
+                        IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
+
+        s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
+                        &s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
+
+        s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
+                        &s3c2416_irq_uart3,
+                        IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
+
+        s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
+                        &s3c2416_irq_wdtac97,
+                        IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
+
+        return 0;
+}
+
+static struct sysdev_driver s3c2416_irq_driver = {
+        .add            = s3c2416_irq_add,
+};
+
+static int __init s3c2416_irq_init(void)
+{
+        return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_irq_driver);
+}
+
+arch_initcall(s3c2416_irq_init);
+
diff --git a/arch/arm/mach-s3c2416/s3c2416.c b/arch/arm/mach-s3c2416/s3c2416.c
new file mode 100644
index 000000000000..6165dc7010fe
--- /dev/null
+++ b/arch/arm/mach-s3c2416/s3c2416.c
@@ -0,0 +1,115 @@
+/* linux/arch/arm/mach-s3c2416/s3c2416.c
+ *
+ * Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
+ *      as part of OpenInkpot project
+ * Copyright (c) 2009 Promwad Innovation Company
+ *      Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
+ *
+ * Samsung S3C2416 Mobile CPU support
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/sysdev.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <mach/hardware.h>
+#include <asm/proc-fns.h>
+#include <asm/irq.h>
+
+#include <mach/reset.h>
+#include <mach/idle.h>
+#include <mach/regs-s3c2443-clock.h>
+
+#include <plat/s3c2416.h>
+#include <plat/devs.h>
+#include <plat/cpu.h>
+
+static struct map_desc s3c2416_iodesc[] __initdata = {
+        IODESC_ENT(WATCHDOG),
+        IODESC_ENT(CLKPWR),
+        IODESC_ENT(TIMER),
+};
+
+struct sysdev_class s3c2416_sysclass = {
+        .name = "s3c2416-core",
+};
+
+static struct sys_device s3c2416_sysdev = {
+        .cls            = &s3c2416_sysclass,
+};
+
+static void s3c2416_hard_reset(void)
+{
+        __raw_writel(S3C2443_SWRST_RESET, S3C2443_SWRST);
+}
+
+int __init s3c2416_init(void)
+{
+        printk(KERN_INFO "S3C2416: Initializing architecture\n");
+
+        s3c24xx_reset_hook = s3c2416_hard_reset;
+        /* s3c24xx_idle = s3c2416_idle; */
+
+        /* change WDT IRQ number */
+        s3c_device_wdt.resource[1].start = IRQ_S3C2443_WDT;
+        s3c_device_wdt.resource[1].end   = IRQ_S3C2443_WDT;
+
+        return sysdev_register(&s3c2416_sysdev);
+}
+
+void __init s3c2416_init_uarts(struct s3c2410_uartcfg *cfg, int no)
+{
+        s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
+
+        s3c_device_nand.name = "s3c2416-nand";
+}
+
+/* s3c2416_map_io
+ *
+ * register the standard cpu IO areas, and any passed in from the
+ * machine specific initialisation.
+ */
+
+void __init s3c2416_map_io(void)
+{
+        iotable_init(s3c2416_iodesc, ARRAY_SIZE(s3c2416_iodesc));
+}
+
+/* need to register class before we actually register the device, and
+ * we also need to ensure that it has been initialised before any of the
+ * drivers even try to use it (even if not on an s3c2416 based system)
+ * as a driver which may support both 2443 and 2440 may try and use it.
+*/
+
+static int __init s3c2416_core_init(void)
+{
+        return sysdev_class_register(&s3c2416_sysclass);
+}
+
+core_initcall(s3c2416_core_init);