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ppc4xx: Fix 460EX errata with CPU lockup upon high AHB traffic

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This patch implements a fix provided by AMCC so that the lockup upon
simultanious traffic on AHB USB OTG, USB 2.0 and SATA doesn't occur
anymore:

Set SDR0_AHB_CFG[A2P_INCR4] (bit 24) and clear SDR0_AHB_CFG[A2P_PROT2]
(bit 25) for a new 460EX errata regarding concurrent use of AHB USB OTG,
USB 2.0 host and SATA.

This errata is not officially available yet. I'll update the comment
to add the errata number later.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2008-06-28 14:56:17 +02:00
parent 93262af85e
commit 745d8a0d3c
2 changed files with 20 additions and 2 deletions
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20
cpu/ppc4xx/cpu_init.c
View file

@ -138,8 +138,8 @@ void reconfigure_pll(u32 new_cpu_freq)
void
cpu_init_f (void)
{
#if defined(CONFIG_WATCHDOG)
unsigned long val;
#if defined(CONFIG_WATCHDOG) || defined(CONFIG_460EX)
u32 val;
#endif
reconfigure_pll(CFG_PLL_RECONFIG);
@ -272,6 +272,22 @@ cpu_init_f (void)
reset_4xx_watchdog();
#endif /* CONFIG_WATCHDOG */
#if defined(CONFIG_460EX)
/*
* Set SDR0_AHB_CFG[A2P_INCR4] (bit 24) and
* clear SDR0_AHB_CFG[A2P_PROT2] (bit 25) for a new 460EX errata
* regarding concurrent use of AHB USB OTG, USB 2.0 host and SATA
*/
mfsdr(SDR0_AHB_CFG, val);
val |= 0x80;
val &= ~0x40;
mtsdr(SDR0_AHB_CFG, val);
mfsdr(SDR0_USB2HOST_CFG, val);
val &= ~0xf00;
val |= 0x400;
mtsdr(SDR0_USB2HOST_CFG, val);
#endif /* CONFIG_460EX */
}
/*

2
include/ppc440.h
View file

@ -2471,6 +2471,8 @@
#define AHB_TOP 0xA4
#define AHB_BOT 0xA5
#define SDR0_AHB_CFG 0x370
#define SDR0_USB2HOST_CFG 0x371
#endif /* CONFIG_460EX || CONFIG_460GT */
#define SDR0_SDCS_SDD (0x80000000 >> 31)