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[ARM] Acer n30: Hardware initialisation.

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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>
This commit is contained in:
Christer Weinigel
2008-07-07 18:12:47 +01:00
committed by Ben Dooks
parent e43f238390
commit 9a2ddb7866
1 changed files with 139 additions and 0 deletions
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139
arch/arm/mach-s3c2410/mach-n30.c
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@ -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));
}