[ARM] Acer n30: Hardware initialisation.

Initialise the hardware register settings on boot, to allow the
device to function correctly.

Signed-off-by: Christer Weinigel <christer@weinigel.se>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 139 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index 476b15c089a..450d10823f8 100644
--- a/arch/arm/mach-s3c2410/mach-n30.c
+++ b/arch/arm/mach-s3c2410/mach-n30.c
@@ -345,9 +345,148 @@ static struct s3c2410_platform_i2c n30_i2ccfg = {
         .max_freq       = 10*1000,
 };
 
+/* Lots of hardcoded stuff, but it sets up the hardware in a useful
+ * state so that we can boot Linux directly from flash. */
+static void __init n30_hwinit(void)
+{
+        /* GPA0-11 special functions -- unknown what they do
+         * GPA12 N30 special function -- unknown what it does
+         *       N35/PiN output -- unknown what it does
+         *
+         * A12 is nGCS1 on the N30 and an output on the N35/PiN.  I
+         * don't think it does anything useful on the N30, so I ought
+         * to make it an output there too since it always driven to 0
+         * as far as I can tell. */
+        if (machine_is_n30())
+                __raw_writel(0x007fffff, S3C2410_GPACON);
+        if (machine_is_n35())
+                __raw_writel(0x007fefff, S3C2410_GPACON);
+        __raw_writel(0x00000000, S3C2410_GPADAT);
+
+        /* GPB0 TOUT0 backlight level
+         * GPB1 output 1=backlight on
+         * GPB2 output IrDA enable 0=transceiver enabled, 1=disabled
+         * GPB3 output USB D+ pull up 0=disabled, 1=enabled
+         * GPB4 N30 output -- unknown function
+         *      N30/PiN GPS control 0=GPS enabled, 1=GPS disabled
+         * GPB5 output -- unknown function
+         * GPB6 input -- unknown function
+         * GPB7 output -- unknown function
+         * GPB8 output -- probably LCD driver enable
+         * GPB9 output -- probably LCD VSYNC driver enable
+         * GPB10 output -- probably LCD HSYNC driver enable
+         */
+        __raw_writel(0x00154556, S3C2410_GPBCON);
+        __raw_writel(0x00000750, S3C2410_GPBDAT);
+        __raw_writel(0x00000073, S3C2410_GPBUP);
+
+        /* GPC0 input RS232 DCD/DSR/RI
+         * GPC1 LCD
+         * GPC2 output RS232 DTR?
+         * GPC3 input RS232 DCD/DSR/RI
+         * GPC4 LCD
+         * GPC5 output 0=NAND write enabled, 1=NAND write protect
+         * GPC6 input -- unknown function
+         * GPC7 input charger status 0=charger connected
+         *      this input can be triggered by power on the USB device
+         *      port too, but will go back to disconnected soon after.
+         * GPC8 N30/N35 output -- unknown function, always driven to 1
+         *      PiN input -- unknown function, always read as 1
+         *      Make it an input with a pull up for all models.
+         * GPC9-15 LCD
+         */
+        __raw_writel(0xaaa80618, S3C2410_GPCCON);
+        __raw_writel(0x0000014c, S3C2410_GPCDAT);
+        __raw_writel(0x0000fef2, S3C2410_GPCUP);
+
+        /* GPD0 input -- unknown function
+         * GPD1-D7 LCD
+         * GPD8 N30 output -- unknown function
+         *      N35/PiN output 1=GPS LED on
+         * GPD9 output 0=power led blinks red, 1=normal power led function
+         * GPD10 output -- unknown function
+         * GPD11-15 LCD drivers
+         */
+        __raw_writel(0xaa95aaa4, S3C2410_GPDCON);
+        __raw_writel(0x00000601, S3C2410_GPDDAT);
+        __raw_writel(0x0000fbfe, S3C2410_GPDUP);
+
+        /* GPE0-4 I2S audio bus
+         * GPE5-10 SD/MMC bus
+         * E11-13 outputs -- unknown function, probably power management
+         * E14-15 I2C bus connected to the battery controller
+         */
+        __raw_writel(0xa56aaaaa, S3C2410_GPECON);
+        __raw_writel(0x0000efc5, S3C2410_GPEDAT);
+        __raw_writel(0x0000f81f, S3C2410_GPEUP);
+
+        /* GPF0  input 0=power button pressed
+         * GPF1  input SD/MMC switch 0=card present
+         * GPF2  N30 1=reset button pressed (inverted compared to the rest)
+         *       N35/PiN 0=reset button pressed
+         * GPF3  N30/PiN input -- unknown function
+         *       N35 input GPS antenna position, 0=antenna closed, 1=open
+         * GPF4  input 0=button 4 pressed
+         * GPF5  input 0=button 3 pressed
+         * GPF6  input 0=button 2 pressed
+         * GPF7  input 0=button 1 pressed
+         */
+        __raw_writel(0x0000aaaa, S3C2410_GPFCON);
+        __raw_writel(0x00000000, S3C2410_GPFDAT);
+        __raw_writel(0x000000ff, S3C2410_GPFUP);
+
+        /* GPG0  input RS232 DCD/DSR/RI
+         * GPG1  input 1=USB gadget port has power from a host
+         * GPG2  N30 input -- unknown function
+         *       N35/PiN input 0=headphones plugged in, 1=not plugged in
+         * GPG3  N30 output -- unknown function
+         *       N35/PiN input with unknown function
+         * GPG4  N30 output 0=MMC enabled, 1=MMC disabled
+         * GPG5  N30 output 0=BlueTooth chip disabled, 1=enabled
+         *       N35/PiN input joystick right
+         * GPG6  N30 output 0=blue led on, 1=off
+         *       N35/PiN input joystick left
+         * GPG7  input 0=thumbwheel pressed
+         * GPG8  input 0=thumbwheel down
+         * GPG9  input 0=thumbwheel up
+         * GPG10 input SD/MMC write protect switch
+         * GPG11 N30 input -- unknown function
+         *       N35 output 0=GPS antenna powered, 1=not powered
+         *       PiN output -- unknown function
+         * GPG12-15 touch screen functions
+         *
+         * The pullups differ between the models, so enable all
+         * pullups that are enabled on any of the models.
+         */
+        if (machine_is_n30())
+                __raw_writel(0xff0a956a, S3C2410_GPGCON);
+        if (machine_is_n35())
+                __raw_writel(0xff4aa92a, S3C2410_GPGCON);
+        __raw_writel(0x0000e800, S3C2410_GPGDAT);
+        __raw_writel(0x0000f86f, S3C2410_GPGUP);
+
+        /* GPH0/1/2/3 RS232 serial port
+         * GPH4/5 IrDA serial port
+         * GPH6/7  N30 BlueTooth serial port
+         *         N35/PiN GPS receiver
+         * GPH8 input -- unknown function
+         * GPH9 CLKOUT0 HCLK -- unknown use
+         * GPH10 CLKOUT1 FCLK -- unknown use
+         *
+         * The pull ups for H6/H7 are enabled on N30 but not on the
+         * N35/PiN.  I suppose is useful for a budget model of the N30
+         * with no bluetooh.  It doesn't hurt to have the pull ups
+         * enabled on the N35, so leave them enabled for all models.
+         */
+        __raw_writel(0x0028aaaa, S3C2410_GPHCON);
+        __raw_writel(0x000005ef, S3C2410_GPHDAT);
+        __raw_writel(0x0000063f, S3C2410_GPHUP);
+}
+
 static void __init n30_map_io(void)
 {
         s3c24xx_init_io(n30_iodesc, ARRAY_SIZE(n30_iodesc));
+        n30_hwinit();
         s3c24xx_init_clocks(0);
         s3c24xx_init_uarts(n30_uartcfgs, ARRAY_SIZE(n30_uartcfgs));
 }