0195c00244
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
389 lines
9.7 KiB
C
389 lines
9.7 KiB
C
/*
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* OMAP2 Power Management Routines
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*
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* Copyright (C) 2005 Texas Instruments, Inc.
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* Copyright (C) 2006-2008 Nokia Corporation
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*
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* Written by:
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* Richard Woodruff <r-woodruff2@ti.com>
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* Tony Lindgren
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* Juha Yrjola
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* Amit Kucheria <amit.kucheria@nokia.com>
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* Igor Stoppa <igor.stoppa@nokia.com>
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*
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* Based on pm.c for omap1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/suspend.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/interrupt.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/irq.h>
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#include <linux/time.h>
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#include <linux/gpio.h>
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#include <asm/mach/time.h>
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#include <asm/mach/irq.h>
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#include <asm/mach-types.h>
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#include <asm/system_misc.h>
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#include <plat/clock.h>
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#include <plat/sram.h>
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#include <plat/dma.h>
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#include <plat/board.h>
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#include <mach/irqs.h>
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#include "common.h"
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#include "prm2xxx_3xxx.h"
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#include "prm-regbits-24xx.h"
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#include "cm2xxx_3xxx.h"
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#include "cm-regbits-24xx.h"
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#include "sdrc.h"
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#include "pm.h"
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#include "control.h"
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#include "powerdomain.h"
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#include "clockdomain.h"
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static void (*omap2_sram_idle)(void);
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static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl,
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void __iomem *sdrc_power);
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static struct powerdomain *mpu_pwrdm, *core_pwrdm;
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static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm;
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static struct clk *osc_ck, *emul_ck;
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static int omap2_fclks_active(void)
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{
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u32 f1, f2;
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f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
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f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
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return (f1 | f2) ? 1 : 0;
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}
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static int omap2_enter_full_retention(void)
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{
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u32 l;
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/* There is 1 reference hold for all children of the oscillator
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* clock, the following will remove it. If no one else uses the
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* oscillator itself it will be disabled if/when we enter retention
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* mode.
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*/
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clk_disable(osc_ck);
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/* Clear old wake-up events */
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/* REVISIT: These write to reserved bits? */
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
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omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
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/*
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* Set MPU powerdomain's next power state to RETENTION;
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* preserve logic state during retention
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*/
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pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
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pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
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/* Workaround to kill USB */
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l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
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omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
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omap2_gpio_prepare_for_idle(0);
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/* One last check for pending IRQs to avoid extra latency due
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* to sleeping unnecessarily. */
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if (omap_irq_pending())
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goto no_sleep;
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/* Jump to SRAM suspend code */
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omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
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OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
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OMAP_SDRC_REGADDR(SDRC_POWER));
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no_sleep:
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omap2_gpio_resume_after_idle();
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clk_enable(osc_ck);
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/* clear CORE wake-up events */
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
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/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
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omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD, PM_WKST);
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/* MPU domain wake events */
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l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
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if (l & 0x01)
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omap2_prm_write_mod_reg(0x01, OCP_MOD,
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OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
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if (l & 0x20)
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omap2_prm_write_mod_reg(0x20, OCP_MOD,
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OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
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/* Mask future PRCM-to-MPU interrupts */
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omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
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return 0;
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}
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static int omap2_i2c_active(void)
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{
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u32 l;
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l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
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return l & (OMAP2420_EN_I2C2_MASK | OMAP2420_EN_I2C1_MASK);
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}
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static int sti_console_enabled;
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static int omap2_allow_mpu_retention(void)
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{
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u32 l;
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/* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
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l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
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if (l & (OMAP2420_EN_MMC_MASK | OMAP24XX_EN_UART2_MASK |
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OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_MCSPI2_MASK |
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OMAP24XX_EN_MCSPI1_MASK | OMAP24XX_EN_DSS1_MASK))
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return 0;
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/* Check for UART3. */
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l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
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if (l & OMAP24XX_EN_UART3_MASK)
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return 0;
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if (sti_console_enabled)
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return 0;
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return 1;
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}
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static void omap2_enter_mpu_retention(void)
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{
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int only_idle = 0;
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/* Putting MPU into the WFI state while a transfer is active
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* seems to cause the I2C block to timeout. Why? Good question. */
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if (omap2_i2c_active())
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return;
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/* The peripherals seem not to be able to wake up the MPU when
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* it is in retention mode. */
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if (omap2_allow_mpu_retention()) {
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/* REVISIT: These write to reserved bits? */
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
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omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
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omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
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/* Try to enter MPU retention */
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omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) |
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OMAP_LOGICRETSTATE_MASK,
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MPU_MOD, OMAP2_PM_PWSTCTRL);
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} else {
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/* Block MPU retention */
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omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD,
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OMAP2_PM_PWSTCTRL);
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only_idle = 1;
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}
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omap2_sram_idle();
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}
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static int omap2_can_sleep(void)
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{
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if (omap2_fclks_active())
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return 0;
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if (osc_ck->usecount > 1)
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return 0;
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if (omap_dma_running())
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return 0;
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return 1;
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}
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static void omap2_pm_idle(void)
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{
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local_fiq_disable();
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if (!omap2_can_sleep()) {
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if (omap_irq_pending())
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goto out;
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omap2_enter_mpu_retention();
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goto out;
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}
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if (omap_irq_pending())
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goto out;
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omap2_enter_full_retention();
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out:
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local_fiq_enable();
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}
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static void __init prcm_setup_regs(void)
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{
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int i, num_mem_banks;
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struct powerdomain *pwrdm;
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/*
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* Enable autoidle
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* XXX This should be handled by hwmod code or PRCM init code
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*/
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omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
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OMAP2_PRCM_SYSCONFIG_OFFSET);
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/*
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* Set CORE powerdomain memory banks to retain their contents
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* during RETENTION
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*/
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num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
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for (i = 0; i < num_mem_banks; i++)
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pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
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/* Set CORE powerdomain's next power state to RETENTION */
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pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
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/*
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* Set MPU powerdomain's next power state to RETENTION;
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* preserve logic state during retention
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*/
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pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
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pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
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/* Force-power down DSP, GFX powerdomains */
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pwrdm = clkdm_get_pwrdm(dsp_clkdm);
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pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
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clkdm_sleep(dsp_clkdm);
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pwrdm = clkdm_get_pwrdm(gfx_clkdm);
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pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
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clkdm_sleep(gfx_clkdm);
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/* Enable hardware-supervised idle for all clkdms */
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clkdm_for_each(omap_pm_clkdms_setup, NULL);
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clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
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#ifdef CONFIG_SUSPEND
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omap_pm_suspend = omap2_enter_full_retention;
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#endif
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/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
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* stabilisation */
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omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
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OMAP2_PRCM_CLKSSETUP_OFFSET);
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/* Configure automatic voltage transition */
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omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
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OMAP2_PRCM_VOLTSETUP_OFFSET);
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omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK |
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(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
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OMAP24XX_MEMRETCTRL_MASK |
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(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
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(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
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OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);
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/* Enable wake-up events */
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omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK,
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WKUP_MOD, PM_WKEN);
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}
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static int __init omap2_pm_init(void)
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{
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u32 l;
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if (!cpu_is_omap24xx())
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return -ENODEV;
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printk(KERN_INFO "Power Management for OMAP2 initializing\n");
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l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
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printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
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/* Look up important powerdomains */
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mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
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if (!mpu_pwrdm)
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pr_err("PM: mpu_pwrdm not found\n");
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core_pwrdm = pwrdm_lookup("core_pwrdm");
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if (!core_pwrdm)
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pr_err("PM: core_pwrdm not found\n");
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/* Look up important clockdomains */
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mpu_clkdm = clkdm_lookup("mpu_clkdm");
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if (!mpu_clkdm)
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pr_err("PM: mpu_clkdm not found\n");
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wkup_clkdm = clkdm_lookup("wkup_clkdm");
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if (!wkup_clkdm)
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pr_err("PM: wkup_clkdm not found\n");
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dsp_clkdm = clkdm_lookup("dsp_clkdm");
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if (!dsp_clkdm)
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pr_err("PM: dsp_clkdm not found\n");
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gfx_clkdm = clkdm_lookup("gfx_clkdm");
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if (!gfx_clkdm)
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pr_err("PM: gfx_clkdm not found\n");
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osc_ck = clk_get(NULL, "osc_ck");
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if (IS_ERR(osc_ck)) {
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printk(KERN_ERR "could not get osc_ck\n");
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return -ENODEV;
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}
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if (cpu_is_omap242x()) {
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emul_ck = clk_get(NULL, "emul_ck");
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if (IS_ERR(emul_ck)) {
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printk(KERN_ERR "could not get emul_ck\n");
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clk_put(osc_ck);
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return -ENODEV;
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}
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}
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prcm_setup_regs();
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/* Hack to prevent MPU retention when STI console is enabled. */
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{
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const struct omap_sti_console_config *sti;
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sti = omap_get_config(OMAP_TAG_STI_CONSOLE,
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struct omap_sti_console_config);
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if (sti != NULL && sti->enable)
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sti_console_enabled = 1;
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}
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/*
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* We copy the assembler sleep/wakeup routines to SRAM.
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* These routines need to be in SRAM as that's the only
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* memory the MPU can see when it wakes up.
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*/
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if (cpu_is_omap24xx()) {
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omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
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omap24xx_idle_loop_suspend_sz);
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omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
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omap24xx_cpu_suspend_sz);
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}
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arm_pm_idle = omap2_pm_idle;
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return 0;
|
|
}
|
|
|
|
late_initcall(omap2_pm_init);
|