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This patch hardcodes a lot of register settings so that I can boot
directly from flash on the n30.
Is there a nicer way of doing this?
Index: linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-s3c2410/mach-n30.c
+++ linux-2.6.14/arch/arm/mach-s3c2410/mach-n30.c
@@ -349,9 +349,148 @@ static struct s3c24xx_board n30_board __
.devices_count = ARRAY_SIZE(n30_devices)
};
+/* 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(0x0000007d, 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
+ * enable, 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));
s3c24xx_set_board(&n30_board);
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