From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out001.atlarge.net (out001.atlarge.net [129.41.63.69]) by ozlabs.org (Postfix) with ESMTP id 0EF21DE01B for ; Thu, 1 Mar 2007 18:59:43 +1100 (EST) Date: Thu, 1 Mar 2007 08:59:19 +0100 From: Domen Puncer To: linuxppc-embedded@ozlabs.org Subject: [u-boot patch] support lite5200b wakeup in u-boot Message-ID: <20070301075919.GG17184@moe.telargo.com> References: <20070301075323.GP4397@moe.telargo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20070301075323.GP4397@moe.telargo.com> List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , U-Boot part of Lite5200b low power mode support. Puts SDRAM out of self-refresh and transfers control to address saved at physical 0x0 Signed-off-by: Domen Puncer diff --git a/board/icecube/icecube.c b/board/icecube/icecube.c index 9b222da..4b35776 100644 --- a/board/icecube/icecube.c +++ b/board/icecube/icecube.c @@ -42,6 +42,54 @@ # else #include "mt48lc16m16a2-75.h" # endif #endif + +#ifdef CONFIG_LITE5200B +/* u-boot part of low-power mode implementation */ +#define SAVED_ADDR (*(void **)0x00000000) +#define PSC2_4 0x02 + +void lite5200b_wakeup(void) +{ + unsigned char wakeup_pin; + void (*linux_wakeup)(void); + + /* check PSC2_4, if it's down "QT" is signaling we have a wakeup + * from low power mode */ + *(vu_char *)MPC5XXX_WU_GPIO_ENABLE = PSC2_4; + __asm__ volatile ("sync"); + + wakeup_pin = *(vu_char *)MPC5XXX_WU_GPIO_DATA_I; + if (wakeup_pin & PSC2_4) + return; + + /* acknowledge to "QT" + * by holding pin at 1 for 10 uS */ + *(vu_char *)MPC5XXX_WU_GPIO_DIR = PSC2_4; + __asm__ volatile ("sync"); + *(vu_char *)MPC5XXX_WU_GPIO_DATA = PSC2_4; + __asm__ volatile ("sync"); + udelay(10); + + /* put ram out of self-refresh */ + *(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x80000000; // mode_en + __asm__ volatile ("sync"); + *(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x50000000; // cke ref_en + __asm__ volatile ("sync"); + *(vu_long *)MPC5XXX_SDRAM_CTRL &= ~0x80000000; // !mode_en + __asm__ volatile ("sync"); + udelay(10); /* wait a bit */ + + /* jump back to linux kernel code */ + linux_wakeup = SAVED_ADDR; + printf("\n\nLooks like we just woke, transferring control to 0x%08lx\n", + linux_wakeup); + linux_wakeup(); +} +#else +#define lite5200b_wakeup +#endif + + #ifndef CFG_RAMBOOT static void sdram_start (int hi_addr) { @@ -208,6 +256,8 @@ #endif /* CFG_RAMBOOT */ __asm__ volatile ("sync"); } + lite5200b_wakeup(); + return dramsize + dramsize2; } diff --git a/include/mpc5xxx.h b/include/mpc5xxx.h index 1d20d1d..c7eb090 100644 --- a/include/mpc5xxx.h +++ b/include/mpc5xxx.h @@ -189,6 +189,7 @@ #define MPC5XXX_WU_GPIO_ENABLE (MPC5XXX #define MPC5XXX_WU_GPIO_ODE (MPC5XXX_WU_GPIO + 0x0004) #define MPC5XXX_WU_GPIO_DIR (MPC5XXX_WU_GPIO + 0x0008) #define MPC5XXX_WU_GPIO_DATA (MPC5XXX_WU_GPIO + 0x000c) +#define MPC5XXX_WU_GPIO_DATA_I (MPC5XXX_WU_GPIO + 0x0020) /* PCI registers */ #define MPC5XXX_PCI_CMD (MPC5XXX_PCI + 0x04)