From 4af4016c53f52b26461b8030211f8427a58fa5ed Mon Sep 17 00:00:00 2001 From: Kevin Hilman Date: Wed, 4 Feb 2009 10:51:40 -0800 Subject: OMAP3: PM: UART: disable clocks when idle and off-mode support This patch allows the UART clocks to be disabled when the OMAP UARTs are inactive, thus permitting the chip to hit retention in idle. After the expiration of an activity timer, each UART is allowed to disable its clocks so the system can enter retention. The activity timer is (re)activated on any UART interrupt, UART wake event or any IO pad wakeup. The actual disable of the UART clocks is done in the 'prepare_idle' hook called from the OMAP idle loop. While the activity timer is active, the smart-idle mode of the UART is also disabled. This is due to a "feature" of the UART module that after a UART wakeup, the smart-idle mode may be entered before the UART has communicated the interrupt, or upon TX, an idle mode may be entered before the TX FIFOs are emptied. Upon suspend, the 'prepare_suspend' hook cancels any pending activity timers and allows the clocks to be disabled immediately. In addition, upon disabling clocks the UART state is saved in case of an off-mode transition while clocks are off. Special thanks to Tero Kristo for the initial ideas and first versions of UART idle support, and to Jouni Hogander for extra testing and bugfixes. Tested on OMAP3 (Beagle, RX51, SDP, EVM) and OMAP2 (n810) Cc: Tero Kristo Cc: Jouni Hogander Signed-off-by: Kevin Hilman --- arch/arm/plat-omap/include/mach/serial.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/arm/plat-omap/include/mach/serial.h') diff --git a/arch/arm/plat-omap/include/mach/serial.h b/arch/arm/plat-omap/include/mach/serial.h index 8a676a04be48..8e895858b3e3 100644 --- a/arch/arm/plat-omap/include/mach/serial.h +++ b/arch/arm/plat-omap/include/mach/serial.h @@ -40,4 +40,13 @@ __ret; \ }) +#ifndef __ASSEMBLER__ +extern void omap_serial_init(void); +extern int omap_uart_can_sleep(void); +extern void omap_uart_check_wakeup(void); +extern void omap_uart_prepare_suspend(void); +extern void omap_uart_prepare_idle(int num); +extern void omap_uart_resume_idle(int num); +#endif + #endif -- cgit v1.2.2 From 44169075e6eaa87bab6a296209d8d0610879b394 Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Thu, 28 May 2009 14:16:04 -0700 Subject: ARM: OMAP4: Add minimal support for omap4 This patch adds the support for OMAP4. The platform and machine specific headers and sources updated for OMAP4430 SDP platform. OMAP4430 is Texas Instrument's SOC based on ARM Cortex-A9 SMP architecture. It's a dual core SOC with GIC used for interrupt handling and SCU for cache coherency. Signed-off-by: Santosh Shilimkar Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/include/mach/serial.h | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'arch/arm/plat-omap/include/mach/serial.h') diff --git a/arch/arm/plat-omap/include/mach/serial.h b/arch/arm/plat-omap/include/mach/serial.h index 8a676a04be48..e37894e423bd 100644 --- a/arch/arm/plat-omap/include/mach/serial.h +++ b/arch/arm/plat-omap/include/mach/serial.h @@ -1,5 +1,8 @@ /* - * arch/arm/plat-omap/include/mach/serial.h + * arch/arm/plat-omap/include/mach/serial.h + * + * Copyright (C) 2009 Texas Instruments + * Addded OMAP4 support- Santosh Shilimkar * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of @@ -15,19 +18,28 @@ #define OMAP_UART1_BASE 0xfffb0000 #define OMAP_UART2_BASE 0xfffb0800 #define OMAP_UART3_BASE 0xfffb9800 +#define OMAP_MAX_NR_PORTS 3 #elif defined(CONFIG_ARCH_OMAP2) /* OMAP2 serial ports */ #define OMAP_UART1_BASE 0x4806a000 #define OMAP_UART2_BASE 0x4806c000 #define OMAP_UART3_BASE 0x4806e000 +#define OMAP_MAX_NR_PORTS 3 #elif defined(CONFIG_ARCH_OMAP3) /* OMAP3 serial ports */ #define OMAP_UART1_BASE 0x4806a000 #define OMAP_UART2_BASE 0x4806c000 #define OMAP_UART3_BASE 0x49020000 +#define OMAP_MAX_NR_PORTS 3 +#elif defined(CONFIG_ARCH_OMAP4) +/* OMAP4 serial ports */ +#define OMAP_UART1_BASE 0x4806a000 +#define OMAP_UART2_BASE 0x4806c000 +#define OMAP_UART3_BASE 0x48020000 +#define OMAP_UART4_BASE 0x4806e000 +#define OMAP_MAX_NR_PORTS 4 #endif -#define OMAP_MAX_NR_PORTS 3 #define OMAP1510_BASE_BAUD (12000000/16) #define OMAP16XX_BASE_BAUD (48000000/16) #define OMAP24XX_BASE_BAUD (48000000/16) -- cgit v1.2.2