[ARM] 3559/1: S3C2442: core and serial port

Patch from Ben Dooks

Core support for the Samsung S3C2442, and the
serial port driver update to allow the serial
port blocks to be used.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 182 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/s3c244x.c b/arch/arm/mach-s3c2410/s3c244x.c
new file mode 100644
index 000000000000..96852a7000db
--- /dev/null
+++ b/arch/arm/mach-s3c2410/s3c244x.c
@@ -0,0 +1,182 @@
+/* linux/arch/arm/mach-s3c2410/s3c244x.c
+ *
+ * Copyright (c) 2004-2006 Simtec Electronics
+ *   Ben Dooks <ben@simtec.co.uk>
+ *
+ * Samsung S3C2440 and S3C2442 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 version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#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/sysdev.h>
+#include <linux/clk.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/regs-serial.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-gpioj.h>
+#include <asm/arch/regs-dsc.h>
+
+#include "s3c2440.h"
+#include "s3c244x.h"
+#include "clock.h"
+#include "devs.h"
+#include "cpu.h"
+#include "pm.h"
+
+static struct map_desc s3c244x_iodesc[] __initdata = {
+        IODESC_ENT(CLKPWR),
+        IODESC_ENT(TIMER),
+        IODESC_ENT(WATCHDOG),
+        IODESC_ENT(LCD),
+        IODESC_ENT(ADC),
+        IODESC_ENT(USBHOST),
+};
+
+/* uart initialisation */
+
+void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
+{
+        s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
+}
+
+void __init s3c244x_map_io(struct map_desc *mach_desc, int size)
+{
+        /* register our io-tables */
+
+        iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
+        iotable_init(mach_desc, size);
+
+        /* rename any peripherals used differing from the s3c2410 */
+
+        s3c_device_i2c.name  = "s3c2440-i2c";
+        s3c_device_nand.name = "s3c2440-nand";
+}
+
+void __init s3c244x_init_clocks(int xtal)
+{
+        unsigned long clkdiv;
+        unsigned long camdiv;
+        unsigned long hclk, fclk, pclk;
+        int hdiv = 1;
+
+        /* now we've got our machine bits initialised, work out what
+         * clocks we've got */
+
+        fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
+
+        clkdiv = __raw_readl(S3C2410_CLKDIVN);
+        camdiv = __raw_readl(S3C2440_CAMDIVN);
+
+        /* work out clock scalings */
+
+        switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
+        case S3C2440_CLKDIVN_HDIVN_1:
+                hdiv = 1;
+                break;
+
+        case S3C2440_CLKDIVN_HDIVN_2:
+                hdiv = 2;
+                break;
+
+        case S3C2440_CLKDIVN_HDIVN_4_8:
+                hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
+                break;
+
+        case S3C2440_CLKDIVN_HDIVN_3_6:
+                hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
+                break;
+        }
+
+        hclk = fclk / hdiv;
+        pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
+
+        /* print brief summary of clocks, etc */
+
+        printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
+               print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
+
+        /* initialise the clocks here, to allow other things like the
+         * console to use them, and to add new ones after the initialisation
+         */
+
+        s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
+}
+
+#ifdef CONFIG_PM
+
+static struct sleep_save s3c244x_sleep[] = {
+        SAVE_ITEM(S3C2440_DSC0),
+        SAVE_ITEM(S3C2440_DSC1),
+        SAVE_ITEM(S3C2440_GPJDAT),
+        SAVE_ITEM(S3C2440_GPJCON),
+        SAVE_ITEM(S3C2440_GPJUP)
+};
+
+static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
+{
+        s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
+        return 0;
+}
+
+static int s3c244x_resume(struct sys_device *dev)
+{
+        s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
+        return 0;
+}
+
+#else
+#define s3c244x_suspend NULL
+#define s3c244x_resume  NULL
+#endif
+
+/* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
+
+struct sysdev_class s3c2440_sysclass = {
+        set_kset_name("s3c2440-core"),
+        .suspend        = s3c244x_suspend,
+        .resume         = s3c244x_resume
+};
+
+struct sysdev_class s3c2442_sysclass = {
+        set_kset_name("s3c2442-core"),
+        .suspend        = s3c244x_suspend,
+        .resume         = s3c244x_resume
+};
+
+/* 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 s3c2440 based system)
+ * as a driver which may support both 2410 and 2440 may try and use it.
+*/
+
+static int __init s3c2440_core_init(void)
+{
+        return sysdev_class_register(&s3c2440_sysclass);
+}
+
+core_initcall(s3c2440_core_init);
+
+static int __init s3c2442_core_init(void)
+{
+        return sysdev_class_register(&s3c2442_sysclass);
+}
+
+core_initcall(s3c2442_core_init);