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136 lines
3.8 KiB
Diff
136 lines
3.8 KiB
Diff
From 4b9227ba510562a51e87487905895aea97e17e77 Mon Sep 17 00:00:00 2001
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From: pankaj chauhan <pankaj.chauhan@freescale.com>
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Date: Tue, 3 Feb 2015 13:08:52 +0530
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Subject: [PATCH 36/70] ls2085a: Add support for reset
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Add support for layerscape reset driver.
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Reset is implemented by raising RESET_REQ_B.
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Signed-off-by: pankaj chauhan <pankaj.chauhan@freescale.com>
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Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
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(cherry picked from commit f248be3aea58ca32b7d77413d742996249b293e9)
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---
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drivers/power/reset/Kconfig | 7 ++-
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drivers/power/reset/Makefile | 1 +
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drivers/power/reset/ls-reboot.c | 93 +++++++++++++++++++++++++++++++++++++++
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3 files changed, 100 insertions(+), 1 deletion(-)
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create mode 100644 drivers/power/reset/ls-reboot.c
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--- a/drivers/power/reset/Kconfig
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+++ b/drivers/power/reset/Kconfig
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@@ -173,5 +173,10 @@ config POWER_RESET_ZX
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help
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Reboot support for ZTE SoCs.
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-endif
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+config POWER_RESET_LAYERSCAPE
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+ bool "Freescale LayerScape reset driver"
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+ depends on ARCH_FSL_LS2085A
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+ help
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+ Reboot support for the Freescale LayerScape SoCs.
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+endif
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--- a/drivers/power/reset/Makefile
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+++ b/drivers/power/reset/Makefile
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@@ -20,3 +20,4 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += sysc
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obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
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obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
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obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
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+obj-$(CONFIG_POWER_RESET_LAYERSCAPE) += ls-reboot.o
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--- /dev/null
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+++ b/drivers/power/reset/ls-reboot.c
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@@ -0,0 +1,93 @@
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+/*
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+ * Freescale LayerScape reboot driver
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+ *
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+ * Copyright (c) 2015, Freescale Semiconductor.
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+ * Author: Pankaj Chauhan <pankaj.chauhan@freescale.com>
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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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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <linux/io.h>
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+#include <linux/of_device.h>
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+#include <linux/of_address.h>
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+#include <linux/platform_device.h>
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+#include <linux/stat.h>
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+#include <linux/slab.h>
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+#include <asm/system_misc.h>
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+
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+struct ls_reboot_priv {
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+ struct device *dev;
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+ u32 *rstcr;
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+};
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+
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+static struct ls_reboot_priv *ls_reboot_priv;
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+
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+static void ls_reboot(enum reboot_mode reboot_mode, const char *cmd)
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+{
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+ struct ls_reboot_priv *priv = ls_reboot_priv;
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+ u32 val;
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+ unsigned long timeout;
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+
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+ if (ls_reboot_priv) {
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+ val = readl(priv->rstcr);
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+ val |= 0x02;
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+ writel(val, priv->rstcr);
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+ }
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+
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+ timeout = jiffies + HZ;
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+ while (time_before(jiffies, timeout))
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+ cpu_relax();
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+
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+}
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+
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+static int ls_reboot_probe(struct platform_device *pdev)
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+{
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+ ls_reboot_priv = devm_kzalloc(&pdev->dev,
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+ sizeof(*ls_reboot_priv), GFP_KERNEL);
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+ if (!ls_reboot_priv) {
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+ dev_err(&pdev->dev, "out of memory for context\n");
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+ return -ENODEV;
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+ }
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+
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+ ls_reboot_priv->rstcr = of_iomap(pdev->dev.of_node, 0);
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+ if (!ls_reboot_priv->rstcr) {
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+ devm_kfree(&pdev->dev, ls_reboot_priv);
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+ dev_err(&pdev->dev, "can not map resource\n");
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+ return -ENODEV;
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+ }
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+
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+ ls_reboot_priv->dev = &pdev->dev;
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+
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+ arm_pm_restart = ls_reboot;
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+
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+ return 0;
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+}
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+
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+static struct of_device_id ls_reboot_of_match[] = {
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+ { .compatible = "fsl,ls-reset" },
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+ {}
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+};
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+
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+static struct platform_driver ls_reboot_driver = {
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+ .probe = ls_reboot_probe,
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+ .driver = {
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+ .name = "ls-reset",
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+ .of_match_table = ls_reboot_of_match,
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+ },
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+};
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+
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+static int __init ls_reboot_init(void)
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+{
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+ return platform_driver_register(&ls_reboot_driver);
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+}
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+device_initcall(ls_reboot_init);
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