# Power Management
obj-$(CONFIG_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
+obj-$(CONFIG_SUSPEND) += pm.o sleep.o
#define DDR2_SDRCR_OFFSET 0xc
#define DDR2_SRPD_BIT BIT(23)
+#define DDR2_MCLKSTOPEN_BIT BIT(30)
#define DDR2_LPMODEN_BIT BIT(31)
/*
--- /dev/null
+/*
+ * TI DaVinci platform support for power management.
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef _MACH_DAVINCI_PM_H
+#define _MACH_DAVINCI_PM_H
+
+/*
+ * Caution: Assembly code in sleep.S makes assumtion on the order
+ * of the members of this structure.
+ */
+struct davinci_pm_config {
+ void __iomem *ddr2_ctlr_base;
+ void __iomem *ddrpsc_reg_base;
+ int ddrpsc_num;
+ void __iomem *ddrpll_reg_base;
+ void __iomem *deepsleep_reg;
+ void __iomem *cpupll_reg_base;
+ /*
+ * Note on SLEEPCOUNT:
+ * The SLEEPCOUNT feature is mainly intended for cases in which
+ * the internal oscillator is used. The internal oscillator is
+ * fully disabled in deep sleep mode. When you exist deep sleep
+ * mode, the oscillator will be turned on and will generate very
+ * small oscillations which will not be detected by the deep sleep
+ * counter. Eventually those oscillations will grow to an amplitude
+ * large enough to start incrementing the deep sleep counter.
+ * In this case recommendation from hardware engineers is that the
+ * SLEEPCOUNT be set to 4096. This means that 4096 valid clock cycles
+ * must be detected before the clock is passed to the rest of the
+ * system.
+ * In the case that the internal oscillator is not used and the
+ * clock is generated externally, the SLEEPCOUNT value can be very
+ * small since the clock input is assumed to be stable before SoC
+ * is taken out of deepsleep mode. A value of 128 would be more than
+ * adequate.
+ */
+ int sleepcount;
+};
+
+extern unsigned int davinci_cpu_suspend_sz;
+extern void davinci_cpu_suspend(struct davinci_pm_config *);
+
+#endif
--- /dev/null
+/*
+ * DaVinci Power Management Routines
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+
+#include <asm/cacheflush.h>
+#include <asm/delay.h>
+
+#include <mach/da8xx.h>
+#include <mach/sram.h>
+#include <mach/pm.h>
+
+#include "clock.h"
+
+#define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF
+
+static void (*davinci_sram_suspend) (struct davinci_pm_config *);
+static struct davinci_pm_config *pdata;
+
+static void davinci_sram_push(void *dest, void *src, unsigned int size)
+{
+ memcpy(dest, src, size);
+ flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
+}
+
+static void davinci_pm_suspend(void)
+{
+ unsigned val;
+
+ if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
+
+ /* Switch CPU PLL to bypass mode */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+ udelay(PLL_BYPASS_TIME);
+
+ /* Powerdown CPU PLL */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val |= PLLCTL_PLLPWRDN;
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+ }
+
+ /* Configure sleep count in deep sleep register */
+ val = __raw_readl(pdata->deepsleep_reg);
+ val &= ~DEEPSLEEP_SLEEPCOUNT_MASK,
+ val |= pdata->sleepcount;
+ __raw_writel(val, pdata->deepsleep_reg);
+
+ /* System goes to sleep in this call */
+ davinci_sram_suspend(pdata);
+
+ if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) {
+
+ /* put CPU PLL in reset */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val &= ~PLLCTL_PLLRST;
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+ /* put CPU PLL in power down */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val &= ~PLLCTL_PLLPWRDN;
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+ /* wait for CPU PLL reset */
+ udelay(PLL_RESET_TIME);
+
+ /* bring CPU PLL out of reset */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val |= PLLCTL_PLLRST;
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+
+ /* Wait for CPU PLL to lock */
+ udelay(PLL_LOCK_TIME);
+
+ /* Remove CPU PLL from bypass mode */
+ val = __raw_readl(pdata->cpupll_reg_base + PLLCTL);
+ val &= ~PLLCTL_PLLENSRC;
+ val |= PLLCTL_PLLEN;
+ __raw_writel(val, pdata->cpupll_reg_base + PLLCTL);
+ }
+}
+
+static int davinci_pm_enter(suspend_state_t state)
+{
+ int ret = 0;
+
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ case PM_SUSPEND_MEM:
+ davinci_pm_suspend();
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static struct platform_suspend_ops davinci_pm_ops = {
+ .enter = davinci_pm_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+static int __init davinci_pm_probe(struct platform_device *pdev)
+{
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "cannot get platform data\n");
+ return -ENOENT;
+ }
+
+ davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
+ if (!davinci_sram_suspend) {
+ dev_err(&pdev->dev, "cannot allocate SRAM memory\n");
+ return -ENOMEM;
+ }
+
+ davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
+ davinci_cpu_suspend_sz);
+
+ suspend_set_ops(&davinci_pm_ops);
+
+ return 0;
+}
+
+static int __exit davinci_pm_remove(struct platform_device *pdev)
+{
+ sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz);
+ return 0;
+}
+
+static struct platform_driver davinci_pm_driver = {
+ .driver = {
+ .name = "pm-davinci",
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(davinci_pm_remove),
+};
+
+static int __init davinci_pm_init(void)
+{
+ return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe);
+}
+late_initcall(davinci_pm_init);
--- /dev/null
+/*
+ * (C) Copyright 2009, Texas Instruments, Inc. http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* replicated define because linux/bitops.h cannot be included in assembly */
+#define BIT(nr) (1 << (nr))
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <mach/psc.h>
+#include <mach/memory.h>
+
+#include "clock.h"
+
+/* Arbitrary, hardware currently does not update PHYRDY correctly */
+#define PHYRDY_CYCLES 0x1000
+
+/* Assume 25 MHz speed for the cycle conversions since PLLs are bypassed */
+#define PLL_BYPASS_CYCLES (PLL_BYPASS_TIME * 25)
+#define PLL_RESET_CYCLES (PLL_RESET_TIME * 25)
+#define PLL_LOCK_CYCLES (PLL_LOCK_TIME * 25)
+
+#define DEEPSLEEP_SLEEPENABLE_BIT BIT(31)
+
+ .text
+/*
+ * Move DaVinci into deep sleep state
+ *
+ * Note: This code is copied to internal SRAM by PM code. When the DaVinci
+ * wakes up it continues execution at the point it went to sleep.
+ * Register Usage:
+ * r0: contains virtual base for DDR2 controller
+ * r1: contains virtual base for DDR2 Power and Sleep controller (PSC)
+ * r2: contains PSC number for DDR2
+ * r3: contains virtual base DDR2 PLL controller
+ * r4: contains virtual address of the DEEPSLEEP register
+ */
+ENTRY(davinci_cpu_suspend)
+ stmfd sp!, {r0-r12, lr} @ save registers on stack
+
+ ldr ip, CACHE_FLUSH
+ blx ip
+
+ ldmia r0, {r0-r4}
+
+ /*
+ * Switch DDR to self-refresh mode.
+ */
+
+ /* calculate SDRCR address */
+ ldr ip, [r0, #DDR2_SDRCR_OFFSET]
+ bic ip, ip, #DDR2_SRPD_BIT
+ orr ip, ip, #DDR2_LPMODEN_BIT
+ str ip, [r0, #DDR2_SDRCR_OFFSET]
+
+ ldr ip, [r0, #DDR2_SDRCR_OFFSET]
+ orr ip, ip, #DDR2_MCLKSTOPEN_BIT
+ str ip, [r0, #DDR2_SDRCR_OFFSET]
+
+ mov ip, #PHYRDY_CYCLES
+1: subs ip, ip, #0x1
+ bne 1b
+
+ /* Disable DDR2 LPSC */
+ mov r7, r0
+ mov r0, #0x2
+ bl davinci_ddr_psc_config
+ mov r0, r7
+
+ /* Disable clock to DDR PHY */
+ ldr ip, [r3, #PLLDIV1]
+ bic ip, ip, #PLLDIV_EN
+ str ip, [r3, #PLLDIV1]
+
+ /* Put the DDR PLL in bypass and power down */
+ ldr ip, [r3, #PLLCTL]
+ bic ip, ip, #PLLCTL_PLLENSRC
+ bic ip, ip, #PLLCTL_PLLEN
+ str ip, [r3, #PLLCTL]
+
+ /* Wait for PLL to switch to bypass */
+ mov ip, #PLL_BYPASS_CYCLES
+2: subs ip, ip, #0x1
+ bne 2b
+
+ /* Power down the PLL */
+ ldr ip, [r3, #PLLCTL]
+ orr ip, ip, #PLLCTL_PLLPWRDN
+ str ip, [r3, #PLLCTL]
+
+ /* Go to deep sleep */
+ ldr ip, [r4]
+ orr ip, ip, #DEEPSLEEP_SLEEPENABLE_BIT
+ /* System goes to sleep beyond after this instruction */
+ str ip, [r4]
+
+ /* Wake up from sleep */
+
+ /* Clear sleep enable */
+ ldr ip, [r4]
+ bic ip, ip, #DEEPSLEEP_SLEEPENABLE_BIT
+ str ip, [r4]
+
+ /* initialize the DDR PLL controller */
+
+ /* Put PLL in reset */
+ ldr ip, [r3, #PLLCTL]
+ bic ip, ip, #PLLCTL_PLLRST
+ str ip, [r3, #PLLCTL]
+
+ /* Clear PLL power down */
+ ldr ip, [r3, #PLLCTL]
+ bic ip, ip, #PLLCTL_PLLPWRDN
+ str ip, [r3, #PLLCTL]
+
+ mov ip, #PLL_RESET_CYCLES
+3: subs ip, ip, #0x1
+ bne 3b
+
+ /* Bring PLL out of reset */
+ ldr ip, [r3, #PLLCTL]
+ orr ip, ip, #PLLCTL_PLLRST
+ str ip, [r3, #PLLCTL]
+
+ /* Wait for PLL to lock (assume prediv = 1, 25MHz OSCIN) */
+ mov ip, #PLL_LOCK_CYCLES
+4: subs ip, ip, #0x1
+ bne 4b
+
+ /* Remove PLL from bypass mode */
+ ldr ip, [r3, #PLLCTL]
+ bic ip, ip, #PLLCTL_PLLENSRC
+ orr ip, ip, #PLLCTL_PLLEN
+ str ip, [r3, #PLLCTL]
+
+ /* Start 2x clock to DDR2 */
+
+ ldr ip, [r3, #PLLDIV1]
+ orr ip, ip, #PLLDIV_EN
+ str ip, [r3, #PLLDIV1]
+
+ /* Enable VCLK */
+
+ /* Enable DDR2 LPSC */
+ mov r7, r0
+ mov r0, #0x3
+ bl davinci_ddr_psc_config
+ mov r0, r7
+
+ /* clear MCLKSTOPEN */
+
+ ldr ip, [r0, #DDR2_SDRCR_OFFSET]
+ bic ip, ip, #DDR2_MCLKSTOPEN_BIT
+ str ip, [r0, #DDR2_SDRCR_OFFSET]
+
+ ldr ip, [r0, #DDR2_SDRCR_OFFSET]
+ bic ip, ip, #DDR2_LPMODEN_BIT
+ str ip, [r0, #DDR2_SDRCR_OFFSET]
+
+ /* Restore registers and return */
+ ldmfd sp!, {r0-r12, pc}
+
+ENDPROC(davinci_cpu_suspend)
+
+/*
+ * Disables or Enables DDR2 LPSC
+ * Register Usage:
+ * r0: Enable or Disable LPSC r0 = 0x3 => Enable, r0 = 0x2 => Disable LPSC
+ * r1: contains virtual base for DDR2 Power and Sleep controller (PSC)
+ * r2: contains PSC number for DDR2
+ */
+ENTRY(davinci_ddr_psc_config)
+ /* Set next state in mdctl for DDR2 */
+ mov r6, #MDCTL
+ add r6, r6, r2, lsl #2
+ ldr ip, [r1, r6]
+ bic ip, ip, #MDSTAT_STATE_MASK
+ orr ip, ip, r0
+ str ip, [r1, r6]
+
+ /* Enable the Power Domain Transition Command */
+ ldr ip, [r1, #PTCMD]
+ orr ip, ip, #0x1
+ str ip, [r1, #PTCMD]
+
+ /* Check for Transition Complete (PTSTAT) */
+ptstat_done:
+ ldr ip, [r1, #PTSTAT]
+ and ip, ip, #0x1
+ cmp ip, #0x0
+ bne ptstat_done
+
+ /* Check for DDR2 clock disable completion; */
+ mov r6, #MDSTAT
+ add r6, r6, r2, lsl #2
+ddr2clk_stop_done:
+ ldr ip, [r1, r6]
+ and ip, ip, #MDSTAT_STATE_MASK
+ cmp ip, r0
+ bne ddr2clk_stop_done
+
+ mov pc, lr
+ENDPROC(davinci_ddr_psc_config)
+
+CACHE_FLUSH:
+ .word arm926_flush_kern_cache_all
+
+ENTRY(davinci_cpu_suspend_sz)
+ .word . - davinci_cpu_suspend
+ENDPROC(davinci_cpu_suspend_sz)
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