From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752504AbbALVYS (ORCPT ); Mon, 12 Jan 2015 16:24:18 -0500 Received: from down.free-electrons.com ([37.187.137.238]:58015 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751008AbbALVYL (ORCPT ); Mon, 12 Jan 2015 16:24:11 -0500 From: Alexandre Belloni To: Nicolas Ferre Cc: Boris Brezillon , Jean-Christophe Plagniol-Villard , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni Subject: [PATCH 2/6] ARM: at91: pm: use the mmio-sram pool to access SRAM Date: Mon, 12 Jan 2015 22:23:41 +0100 Message-Id: <1421097825-396-3-git-send-email-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1421097825-396-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1421097825-396-1-git-send-email-alexandre.belloni@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that the SRAM is part of a genpool, use it to allocate memory to use for the slowclock implementation. Signed-off-by: Alexandre Belloni --- arch/arm/mach-at91/Kconfig | 1 + arch/arm/mach-at91/pm.c | 46 +++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 46 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index cec0fb5d621a..b7dcef50db23 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -178,6 +178,7 @@ comment "AT91 Feature Selections" config AT91_SLOW_CLOCK bool "Suspend-to-RAM disables main oscillator" + select SRAM depends on SUSPEND help Select this if you want Suspend-to-RAM to save the most power diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index 79aa793d1f00..515791edcc60 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -14,10 +14,12 @@ #include #include #include +#include #include #include #include #include +#include #include #include #include @@ -222,10 +224,52 @@ void at91_pm_set_standby(void (*at91_standby)(void)) } } +#ifdef CONFIG_AT91_SLOW_CLOCK +static void __init at91_pm_sram_init(void) +{ + struct gen_pool *sram_pool; + phys_addr_t sram_pbase; + unsigned long sram_base; + struct device_node *node; + struct platform_device *pdev; + + node = of_find_compatible_node(NULL, NULL, "mmio-sram"); + if (!node) { + pr_warn("%s: failed to find sram node!\n", __func__); + return; + } + + pdev = of_find_device_by_node(node); + if (!pdev) { + pr_warn("%s: failed to find sram device!\n", __func__); + goto put_node; + } + + sram_pool = dev_get_gen_pool(&pdev->dev); + if (!sram_pool) { + pr_warn("%s: sram pool unavailable!\n", __func__); + goto put_node; + } + + sram_base = gen_pool_alloc(sram_pool, at91_slow_clock_sz); + if (!sram_base) { + pr_warn("%s: unable to alloc ocram!\n", __func__); + goto put_node; + } + + sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base); + slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false); + +put_node: + of_node_put(node); +} +#endif + + static int __init at91_pm_init(void) { #ifdef CONFIG_AT91_SLOW_CLOCK - slow_clock = (void *) (AT91_IO_VIRT_BASE - at91_slow_clock_sz); + at91_pm_sram_init(); #endif pr_info("AT91: Power Management%s\n", (slow_clock ? " (with slow clock mode)" : "")); -- 2.1.0