1 files changed, 312 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
new file mode 100644
index 000000000..6953c47d8
--- /dev/null
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -0,0 +1,312 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * OMAP2 Power Management Routines
+ *
+ * Copyright (C) 2005 Texas Instruments, Inc.
+ * Copyright (C) 2006-2008 Nokia Corporation
+ *
+ * Written by:
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * Tony Lindgren
+ * Juha Yrjola
+ * Amit Kucheria <amit.kucheria@nokia.com>
+ * Igor Stoppa <igor.stoppa@nokia.com>
+ *
+ * Based on pm.c for omap1
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/suspend.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/interrupt.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/irq.h>
+#include <linux/time.h>
+
+#include <asm/fncpy.h>
+
+#include <asm/mach/time.h>
+#include <asm/mach/irq.h>
+#include <asm/mach-types.h>
+#include <asm/system_misc.h>
+
+#include <linux/omap-dma.h>
+
+#include "soc.h"
+#include "common.h"
+#include "clock.h"
+#include "prm2xxx.h"
+#include "prm-regbits-24xx.h"
+#include "cm2xxx.h"
+#include "cm-regbits-24xx.h"
+#include "sdrc.h"
+#include "sram.h"
+#include "pm.h"
+#include "control.h"
+#include "powerdomain.h"
+#include "clockdomain.h"
+
+static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl,
+				  void __iomem *sdrc_power);
+
+static struct powerdomain *mpu_pwrdm, *core_pwrdm;
+static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm;
+
+static struct clk *osc_ck, *emul_ck;
+
+static int omap2_enter_full_retention(void)
+{
+	u32 l;
+
+	/* There is 1 reference hold for all children of the oscillator
+	 * clock, the following will remove it. If no one else uses the
+	 * oscillator itself it will be disabled if/when we enter retention
+	 * mode.
+	 */
+	clk_disable(osc_ck);
+
+	/* Clear old wake-up events */
+	/* REVISIT: These write to reserved bits? */
+	omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
+	omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
+	omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0);
+
+	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
+	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
+
+	/* Workaround to kill USB */
+	l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
+	omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
+
+	/* One last check for pending IRQs to avoid extra latency due
+	 * to sleeping unnecessarily. */
+	if (omap_irq_pending())
+		goto no_sleep;
+
+	/* Jump to SRAM suspend code */
+	omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
+			   OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
+			   OMAP_SDRC_REGADDR(SDRC_POWER));
+
+no_sleep:
+	clk_enable(osc_ck);
+
+	/* clear CORE wake-up events */
+	omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
+	omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
+
+	/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
+	omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, 0x4 | 0x1);
+
+	/* MPU domain wake events */
+	omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x1);
+
+	omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x20);
+
+	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
+	pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON);
+
+	return 0;
+}
+
+static int sti_console_enabled;
+
+static int omap2_allow_mpu_retention(void)
+{
+	if (!omap2xxx_cm_mpu_retention_allowed())
+		return 0;
+	if (sti_console_enabled)
+		return 0;
+
+	return 1;
+}
+
+static void omap2_enter_mpu_retention(void)
+{
+	const int zero = 0;
+
+	/* The peripherals seem not to be able to wake up the MPU when
+	 * it is in retention mode. */
+	if (omap2_allow_mpu_retention()) {
+		/* REVISIT: These write to reserved bits? */
+		omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
+		omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
+		omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0);
+
+		/* Try to enter MPU retention */
+		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
+
+	} else {
+		/* Block MPU retention */
+		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
+	}
+
+	/* WFI */
+	asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (zero) : "memory", "cc");
+
+	pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
+}
+
+static int omap2_can_sleep(void)
+{
+	if (omap2xxx_cm_fclks_active())
+		return 0;
+	if (__clk_is_enabled(osc_ck))
+		return 0;
+
+	return 1;
+}
+
+static void omap2_pm_idle(void)
+{
+	int error;
+
+	if (omap_irq_pending())
+		return;
+
+	error = cpu_cluster_pm_enter();
+	if (error || !omap2_can_sleep()) {
+		omap2_enter_mpu_retention();
+		goto out_cpu_cluster_pm;
+	}
+
+	omap2_enter_full_retention();
+
+out_cpu_cluster_pm:
+	cpu_cluster_pm_exit();
+}
+
+static void __init prcm_setup_regs(void)
+{
+	int i, num_mem_banks;
+	struct powerdomain *pwrdm;
+
+	/*
+	 * Enable autoidle
+	 * XXX This should be handled by hwmod code or PRCM init code
+	 */
+	omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
+			  OMAP2_PRCM_SYSCONFIG_OFFSET);
+
+	/*
+	 * Set CORE powerdomain memory banks to retain their contents
+	 * during RETENTION
+	 */
+	num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
+	for (i = 0; i < num_mem_banks; i++)
+		pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
+
+	pwrdm_set_logic_retst(core_pwrdm, PWRDM_POWER_RET);
+
+	pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
+
+	/* Force-power down DSP, GFX powerdomains */
+
+	pwrdm = clkdm_get_pwrdm(dsp_clkdm);
+	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
+
+	pwrdm = clkdm_get_pwrdm(gfx_clkdm);
+	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
+
+	/* Enable hardware-supervised idle for all clkdms */
+	clkdm_for_each(omap_pm_clkdms_setup, NULL);
+	clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
+
+	omap_common_suspend_init(omap2_enter_full_retention);
+
+	/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
+	 * stabilisation */
+	omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
+				OMAP2_PRCM_CLKSSETUP_OFFSET);
+
+	/* Configure automatic voltage transition */
+	omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
+				OMAP2_PRCM_VOLTSETUP_OFFSET);
+	omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK |
+				(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
+				OMAP24XX_MEMRETCTRL_MASK |
+				(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
+				(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
+				OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);
+
+	/* Enable wake-up events */
+	omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK,
+				WKUP_MOD, PM_WKEN);
+
+	/* Enable SYS_CLKEN control when all domains idle */
+	omap2_prm_set_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, OMAP24XX_GR_MOD,
+				   OMAP2_PRCM_CLKSRC_CTRL_OFFSET);
+}
+
+int __init omap2_pm_init(void)
+{
+	u32 l;
+
+	printk(KERN_INFO "Power Management for OMAP2 initializing\n");
+	l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
+	printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
+
+	/* Look up important powerdomains */
+
+	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
+	if (!mpu_pwrdm)
+		pr_err("PM: mpu_pwrdm not found\n");
+
+	core_pwrdm = pwrdm_lookup("core_pwrdm");
+	if (!core_pwrdm)
+		pr_err("PM: core_pwrdm not found\n");
+
+	/* Look up important clockdomains */
+
+	mpu_clkdm = clkdm_lookup("mpu_clkdm");
+	if (!mpu_clkdm)
+		pr_err("PM: mpu_clkdm not found\n");
+
+	wkup_clkdm = clkdm_lookup("wkup_clkdm");
+	if (!wkup_clkdm)
+		pr_err("PM: wkup_clkdm not found\n");
+
+	dsp_clkdm = clkdm_lookup("dsp_clkdm");
+	if (!dsp_clkdm)
+		pr_err("PM: dsp_clkdm not found\n");
+
+	gfx_clkdm = clkdm_lookup("gfx_clkdm");
+	if (!gfx_clkdm)
+		pr_err("PM: gfx_clkdm not found\n");
+
+
+	osc_ck = clk_get(NULL, "osc_ck");
+	if (IS_ERR(osc_ck)) {
+		printk(KERN_ERR "could not get osc_ck\n");
+		return -ENODEV;
+	}
+
+	if (cpu_is_omap242x()) {
+		emul_ck = clk_get(NULL, "emul_ck");
+		if (IS_ERR(emul_ck)) {
+			printk(KERN_ERR "could not get emul_ck\n");
+			clk_put(osc_ck);
+			return -ENODEV;
+		}
+	}
+
+	prcm_setup_regs();
+
+	/*
+	 * We copy the assembler sleep/wakeup routines to SRAM.
+	 * These routines need to be in SRAM as that's the only
+	 * memory the MPU can see when it wakes up after the entire
+	 * chip enters idle.
+	 */
+	omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
+					    omap24xx_cpu_suspend_sz);
+
+	arm_pm_idle = omap2_pm_idle;
+
+	return 0;
+}