From patchwork Tue Apr 2 03:42:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "J, KEERTHY" X-Patchwork-Id: 10880993 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 365B413B5 for ; Tue, 2 Apr 2019 03:43:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20DE62890E for ; Tue, 2 Apr 2019 03:43:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1DBEC28913; Tue, 2 Apr 2019 03:43:35 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 35C70285D4 for ; Tue, 2 Apr 2019 03:43:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729004AbfDBDnd (ORCPT ); Mon, 1 Apr 2019 23:43:33 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:53726 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728682AbfDBDnd (ORCPT ); Mon, 1 Apr 2019 23:43:33 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x323guHt115077; Mon, 1 Apr 2019 22:42:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1554176576; bh=brPflXTsxZ7T53e99RB9WvZYBr7Vjqny6we2M6GIZUo=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=X8vgYYRU91dMCQEjtOAq0VZVD8IvAnQxgIH/xpm8UdyDDzTMq6M6P4PfUgrlmR2wk mxTKZHQdd9intH+SqwPSM+TQGdA6xBW/LsYKYlvGfyBibT4wHFHav9bieJW+17zJlA nx7fqFRAAKtV8VXpYY9BkwceY8Kg90N5aTz3YkXA= Received: from DFLE103.ent.ti.com (dfle103.ent.ti.com [10.64.6.24]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x323guVF082062 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 1 Apr 2019 22:42:56 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Mon, 1 Apr 2019 22:42:56 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Mon, 1 Apr 2019 22:42:56 -0500 Received: from a0393675ula.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x323gb9J070613; Mon, 1 Apr 2019 22:42:53 -0500 From: Keerthy To: , , , CC: , , , , , Subject: [PATCH v2 5/5] soc: ti: pm33xx: AM437X: Add rtc_only with ddr in self-refresh support Date: Tue, 2 Apr 2019 09:12:53 +0530 Message-ID: <20190402034253.4928-6-j-keerthy@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190402034253.4928-1-j-keerthy@ti.com> References: <20190402034253.4928-1-j-keerthy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP During RTC-only suspend, power is lost to the wkup domain, so we need to save and restore the state of that domain. We also need to store some information within the RTC registers so that u-boot can do the right thing at powerup. The state is entered by getting the RTC to bring the pmic_power_en line low which will instruct the PMIC to disable the appropriate power rails after putting DDR into self-refresh mode. To bring pmic_power_en low, we need to get an ALARM2 event. Since we are running from SRAM at that point, it means calculating what the next second is (via ASM) and programming that into the RTC. This patch also adds support for wake up source detection. Signed-off-by: Keerthy Signed-off-by: Dave Gerlach --- drivers/soc/ti/Kconfig | 5 +- drivers/soc/ti/pm33xx.c | 190 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 184 insertions(+), 11 deletions(-) diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig index be4570baad96..57960e92ebe0 100644 --- a/drivers/soc/ti/Kconfig +++ b/drivers/soc/ti/Kconfig @@ -45,11 +45,12 @@ config KEYSTONE_NAVIGATOR_DMA config AMX3_PM tristate "AMx3 Power Management" depends on SOC_AM33XX || SOC_AM43XX - depends on WKUP_M3_IPC && TI_EMIF_SRAM && SRAM + depends on WKUP_M3_IPC && TI_EMIF_SRAM && SRAM && RTC_DRV_OMAP help Enable power management on AM335x and AM437x. Required for suspend to mem and standby states on both AM335x and AM437x platforms and for deeper cpuidle - c-states on AM335x. + c-states on AM335x. Also required for rtc and ddr in self-refresh low + power mode on AM437x platforms. config WKUP_M3_IPC tristate "TI AMx3 Wkup-M3 IPC Driver" diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c index 69128993776d..52394da9660a 100644 --- a/drivers/soc/ti/pm33xx.c +++ b/drivers/soc/ti/pm33xx.c @@ -6,6 +6,7 @@ * Vaibhav Bedia, Dave Gerlach */ +#include #include #include #include @@ -13,9 +14,11 @@ #include #include #include +#include #include #include #include +#include #include #include #include @@ -29,20 +32,47 @@ #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \ (unsigned long)pm_sram->do_wfi) +#define RTC_SCRATCH_RESUME_REG 0 +#define RTC_SCRATCH_MAGIC_REG 1 +#define RTC_REG_BOOT_MAGIC 0x8cd0 /* RTC */ +#define GIC_INT_SET_PENDING_BASE 0x200 +#define AM43XX_GIC_DIST_BASE 0x48241000 + +static u32 rtc_magic_val; + static int (*am33xx_do_wfi_sram)(unsigned long unused); static phys_addr_t am33xx_do_wfi_sram_phys; static struct gen_pool *sram_pool, *sram_pool_data; static unsigned long ocmcram_location, ocmcram_location_data; +static struct rtc_device *omap_rtc; +static void __iomem *gic_dist_base; + static struct am33xx_pm_platform_data *pm_ops; static struct am33xx_pm_sram_addr *pm_sram; static struct device *pm33xx_dev; static struct wkup_m3_ipc *m3_ipc; +#ifdef CONFIG_SUSPEND +static int rtc_only_idle; +static int retrigger_irq; static unsigned long suspend_wfi_flags; +static struct wkup_m3_wakeup_src wakeup_src = {.irq_nr = 0, + .src = "Unknown", +}; + +static struct wkup_m3_wakeup_src rtc_alarm_wakeup = { + .irq_nr = 108, .src = "RTC Alarm", +}; + +static struct wkup_m3_wakeup_src rtc_ext_wakeup = { + .irq_nr = 0, .src = "Ext wakeup", +}; +#endif + static u32 sram_suspend_address(unsigned long addr) { return ((unsigned long)am33xx_do_wfi_sram + @@ -99,13 +129,65 @@ static int am33xx_push_sram_idle(void) return 0; } +static int __init am43xx_map_gic(void) +{ + gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K); + + if (!gic_dist_base) + return -ENOMEM; + + return 0; +} + #ifdef CONFIG_SUSPEND +struct wkup_m3_wakeup_src rtc_wake_src(void) +{ + u32 i; + + i = __raw_readl(pm_ops->get_rtc_base_addr() + 0x44) & 0x40; + + if (i) { + retrigger_irq = rtc_alarm_wakeup.irq_nr; + return rtc_alarm_wakeup; + } + + retrigger_irq = rtc_ext_wakeup.irq_nr; + + return rtc_ext_wakeup; +} + +int am33xx_rtc_only_idle(unsigned long wfi_flags) +{ + rtc_power_off_program(omap_rtc); + am33xx_do_wfi_sram(wfi_flags); + return 0; +} + static int am33xx_pm_suspend(suspend_state_t suspend_state) { int i, ret = 0; - ret = pm_ops->soc_suspend((unsigned long)suspend_state, - am33xx_do_wfi_sram, suspend_wfi_flags); + if (suspend_state == PM_SUSPEND_MEM && + pm_ops->check_off_mode_enable()) { + pm_ops->prepare_rtc_suspend(); + pm_ops->save_context(); + suspend_wfi_flags |= WFI_FLAG_RTC_ONLY; + clk_save_context(); + ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle, + suspend_wfi_flags); + + suspend_wfi_flags &= ~WFI_FLAG_RTC_ONLY; + + if (!ret) { + clk_restore_context(); + pm_ops->restore_context(); + m3_ipc->ops->set_rtc_only(m3_ipc); + am33xx_push_sram_idle(); + } + } else { + ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram, + suspend_wfi_flags); + } if (ret) { dev_err(pm33xx_dev, "PM: Kernel suspend failure\n"); @@ -127,8 +209,20 @@ static int am33xx_pm_suspend(suspend_state_t suspend_state) "PM: CM3 returned unknown result = %d\n", i); ret = -1; } + + /* print the wakeup reason */ + if (rtc_only_idle) { + wakeup_src = rtc_wake_src(); + pr_info("PM: Wakeup source %s\n", wakeup_src.src); + } else { + pr_info("PM: Wakeup source %s\n", + m3_ipc->ops->request_wake_src(m3_ipc)); + } } + if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) + pm_ops->prepare_rtc_resume(); + return ret; } @@ -151,6 +245,18 @@ static int am33xx_pm_enter(suspend_state_t suspend_state) static int am33xx_pm_begin(suspend_state_t state) { int ret = -EINVAL; + struct nvmem_device *nvmem; + + if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) { + nvmem = devm_nvmem_device_get(&omap_rtc->dev, + "omap_rtc_scratch0"); + if (nvmem) + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, + (void *)&rtc_magic_val); + rtc_only_idle = 1; + } else { + rtc_only_idle = 0; + } switch (state) { case PM_SUSPEND_MEM: @@ -166,7 +272,28 @@ static int am33xx_pm_begin(suspend_state_t state) static void am33xx_pm_end(void) { + u32 val = 0; + struct nvmem_device *nvmem; + + nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0"); m3_ipc->ops->finish_low_power(m3_ipc); + if (rtc_only_idle) { + if (retrigger_irq) + /* + * 32 bits of Interrupt Set-Pending correspond to 32 + * 32 interrupts. Compute the bit offset of the + * Interrupt and set that particular bit + * Compute the register offset by dividing interrupt + * number by 32 and mutiplying by 4 + */ + writel_relaxed(1 << (retrigger_irq & 31), + gic_dist_base + GIC_INT_SET_PENDING_BASE + + retrigger_irq / 32 * 4); + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, + (void *)&val); + } + + rtc_only_idle = 0; } static int am33xx_pm_valid(suspend_state_t state) @@ -269,6 +396,42 @@ static int am33xx_pm_alloc_sram(void) return ret; } +static int am33xx_pm_rtc_setup(void) +{ + struct device_node *np; + unsigned long val = 0; + struct nvmem_device *nvmem; + + np = of_find_node_by_name(NULL, "rtc"); + + if (of_device_is_available(np)) { + omap_rtc = rtc_class_open("rtc0"); + if (!omap_rtc) { + pr_warn("PM: rtc0 not available"); + return -EPROBE_DEFER; + } + + nvmem = devm_nvmem_device_get(&omap_rtc->dev, + "omap_rtc_scratch0"); + if (nvmem) { + nvmem_device_read(nvmem, RTC_SCRATCH_MAGIC_REG * 4, + 4, (void *)&rtc_magic_val); + if ((rtc_magic_val & 0xffff) != RTC_REG_BOOT_MAGIC) + pr_warn("PM: bootloader does not support rtc-only!\n"); + + nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, + 4, (void *)&val); + val = pm_sram->resume_address; + nvmem_device_write(nvmem, RTC_SCRATCH_RESUME_REG * 4, + 4, (void *)&val); + } + } else { + pr_warn("PM: no-rtc available, rtc-only mode disabled.\n"); + } + + return 0; +} + static int am33xx_pm_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -284,34 +447,42 @@ static int am33xx_pm_probe(struct platform_device *pdev) return -ENODEV; } + ret = am43xx_map_gic(); + if (ret) { + pr_err("PM: Could not ioremap GIC base\n"); + return ret; + } + pm_sram = pm_ops->get_sram_addrs(); if (!pm_sram) { dev_err(dev, "PM: Cannot get PM asm function addresses!!\n"); return -ENODEV; } + m3_ipc = wkup_m3_ipc_get(); + if (!m3_ipc) { + pr_err("PM: Cannot get wkup_m3_ipc handle\n"); + return -EPROBE_DEFER; + } + pm33xx_dev = dev; ret = am33xx_pm_alloc_sram(); if (ret) return ret; - ret = am33xx_push_sram_idle(); + ret = am33xx_pm_rtc_setup(); if (ret) goto err_free_sram; - m3_ipc = wkup_m3_ipc_get(); - if (!m3_ipc) { - dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n"); - ret = -EPROBE_DEFER; + ret = am33xx_push_sram_idle(); + if (ret) goto err_free_sram; - } am33xx_pm_set_ipc_ops(); #ifdef CONFIG_SUSPEND suspend_set_ops(&am33xx_pm_ops); -#endif /* CONFIG_SUSPEND */ /* * For a system suspend we must flush the caches, we want @@ -323,6 +494,7 @@ static int am33xx_pm_probe(struct platform_device *pdev) suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH; suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF; suspend_wfi_flags |= WFI_FLAG_WAKE_M3; +#endif /* CONFIG_SUSPEND */ ret = pm_ops->init(); if (ret) {