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qi-gta02-revert-unpowered-gsm-UART-safe-at-boot.patch

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Signed-off-by: Andy Green <andy@openmoko.com>
This commit is contained in:
Andy Green 2009-03-02 12:21:38 +00:00 committed by Andy Green
parent 1cb7b0b53c
commit 67d668d781
1 changed files with 22 additions and 2 deletions
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24
qiboot/src/cpu/s3c2442/gta02.c
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@ -239,11 +239,31 @@ void port_init_gta02(void)
* Signal : CLKOUT1 CLKOUT0 UCLK RXD2 TXD2 RXD1 TXD1 RXD0 TXD0 nRTS0 nCTS0
* Binary : 10 , 10 10 , 11 11 , 10 10 , 10 10 , 10 10
*/
/*
* FIXME the following should be removed eventually and only the first stanza
* kept unconditionally. As it stands it allows TX and RTS to drive high into
* a powered-down GSM unit, which draws considerable fault current.
*
* However kernels earlier than andy-tracking from end Feb 2009 do not enforce
* the mode of these GPIOs, so Qi doing the correct thing here "breaks GSM"
* apparently for those users.
*
* Upgrading to current kernel will solve this, so after most distros are on
* 2.6.29-rc3 and later, we should return here and again disable driving out
* into unpowered GSM.
*/
#if 0
rGPHCON = 0x001AAA82; /* H1 and H2 are INPUTs to start with, not UART */
#else
rGPHCON = 0x001AAAAA; /* Wrong but compatible: H1 and H2 = UART */
#endif
/* pulldown on GPH08: UEXTCLK, just floats!
* pulldown GPH1 -- nCTS0 / RTS_MODEM -- floats when GSM off
* pulldown GPH2 -- RXD[0] / TX_MODEM -- floats when GSM off
* pulldown GPH3 -- RXD[0] / RX_MODEM -- floats when GSM off
*/
rGPHCON = 0x001AAA82; /* H1 and H2 are INPUTs to start with, not UART */
rGPHUP = 0x000007FF & ~(1 << 8) & ~(1 << 1) & ~(1 << 3);
rGPHDAT = 0x00000000;