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Message-ID: <1470044943-3814-2-git-send-email-chenhui.zhao@nxp.com>
Date: Mon, 1 Aug 2016 17:49:03 +0800
From: Chenhui Zhao <chenhui.zhao@....com>
To: <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <jason.jin@....com>, <z.chenhui@...il.com>,
Chenhui Zhao <chenhui.zhao@....com>
Subject: [PATCH 2/2] soc: nxp: Add a RCPM driver
The NXP's QorIQ Processors based on ARM Core have a RCPM module
(Run Control and Power Management), which performs all device-level
tasks associated with power management.
This patch mainly implements the wakeup sources configuration before
entering LPM20, a low power state of device-level. The devices can be
waked up by specified sources, such as Flextimer, GPIO and so on.
Signed-off-by: Chenhui Zhao <chenhui.zhao@....com>
---
drivers/soc/fsl/Makefile | 1 +
drivers/soc/fsl/pm/Makefile | 1 +
drivers/soc/fsl/pm/ls-rcpm.c | 144 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 146 insertions(+)
create mode 100644 drivers/soc/fsl/pm/Makefile
create mode 100644 drivers/soc/fsl/pm/ls-rcpm.c
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index 203307f..b5adbaf 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -4,3 +4,4 @@
obj-$(CONFIG_QUICC_ENGINE) += qe/
obj-$(CONFIG_CPM) += qe/
+obj-$(CONFIG_SUSPEND) += pm/
diff --git a/drivers/soc/fsl/pm/Makefile b/drivers/soc/fsl/pm/Makefile
new file mode 100644
index 0000000..e275d63
--- /dev/null
+++ b/drivers/soc/fsl/pm/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARCH_LAYERSCAPE) += ls-rcpm.o
diff --git a/drivers/soc/fsl/pm/ls-rcpm.c b/drivers/soc/fsl/pm/ls-rcpm.c
new file mode 100644
index 0000000..c5f2b97
--- /dev/null
+++ b/drivers/soc/fsl/pm/ls-rcpm.c
@@ -0,0 +1,144 @@
+/*
+ * Run Control and Power Management (RCPM) driver
+ *
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+#define pr_fmt(fmt) "RCPM: %s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/suspend.h>
+
+/* So far there are not more than two registers */
+#define RCPM_IPPDEXPCR0 0x140
+#define RCPM_IPPDEXPCR1 0x144
+#define RCPM_IPPDEXPCR(x) (RCPM_IPPDEXPCR0 + 4 * x)
+#define RCPM_WAKEUP_CELL_MAX_SIZE 2
+
+/* it reprents the number of the registers RCPM_IPPDEXPCR */
+static unsigned int rcpm_wakeup_cells;
+static void __iomem *rcpm_reg_base;
+static u32 ippdexpcr[RCPM_WAKEUP_CELL_MAX_SIZE];
+
+static inline void rcpm_reg_write(u32 offset, u32 value)
+{
+ iowrite32be(value, rcpm_reg_base + offset);
+}
+
+static inline u32 rcpm_reg_read(u32 offset)
+{
+ return ioread32be(rcpm_reg_base + offset);
+}
+
+static void rcpm_wakeup_fixup(struct device *dev, void *data)
+{
+ struct device_node *node = dev ? dev->of_node : NULL;
+ u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1];
+ int ret;
+ int i;
+
+ if (!dev || !node || !device_may_wakeup(dev))
+ return;
+
+ /*
+ * Get the values in the "rcpm-wakeup" property.
+ * Refer to Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+ */
+ ret = of_property_read_u32_array(node, "rcpm-wakeup",
+ value, rcpm_wakeup_cells + 1);
+ if (ret)
+ return;
+
+ pr_debug("wakeup source: the device %s\n", node->full_name);
+
+ for (i = 0; i < rcpm_wakeup_cells; i++)
+ ippdexpcr[i] |= value[i + 1];
+}
+
+static int rcpm_suspend_prepare(void)
+{
+ int i;
+
+ for (i = 0; i < rcpm_wakeup_cells; i++)
+ ippdexpcr[i] = 0;
+
+ dpm_for_each_dev(NULL, rcpm_wakeup_fixup);
+
+ for (i = 0; i < rcpm_wakeup_cells; i++) {
+ rcpm_reg_write(RCPM_IPPDEXPCR(i), ippdexpcr[i]);
+ pr_debug("ippdexpcr%d = 0x%x\n", i, ippdexpcr[i]);
+ }
+
+ return 0;
+}
+
+static int rcpm_suspend_notifier_call(struct notifier_block *bl,
+ unsigned long state,
+ void *unused)
+{
+ switch (state) {
+ case PM_SUSPEND_PREPARE:
+ rcpm_suspend_prepare();
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static const struct of_device_id rcpm_matches[] = {
+ {
+ .compatible = "fsl,qoriq-rcpm-2.1",
+ },
+ {}
+};
+
+static struct notifier_block rcpm_suspend_notifier = {
+ .notifier_call = rcpm_suspend_notifier_call,
+};
+
+static int __init layerscape_rcpm_init(void)
+{
+ struct device_node *np;
+ int ret;
+
+ np = of_find_matching_node_and_match(NULL, rcpm_matches, NULL);
+ if (!np)
+ return -ENODEV;
+
+ ret = of_property_read_u32_index(np, "fsl,#rcpm-wakeup-cells", 0,
+ &rcpm_wakeup_cells);
+ if (ret) {
+ pr_err("Fail to get \"fsl,#rcpm-wakeup-cells\".\n");
+ return -EINVAL;
+ }
+
+ if (rcpm_wakeup_cells > RCPM_WAKEUP_CELL_MAX_SIZE) {
+ pr_err("The value of \"fsl,#rcpm-wakeup-cells\" is wrong.\n");
+ return -EINVAL;
+ }
+
+ rcpm_reg_base = of_iomap(np, 0);
+ if (!rcpm_reg_base)
+ return -ENOMEM;
+
+ register_pm_notifier(&rcpm_suspend_notifier);
+
+ pr_info("The RCPM driver initialized.\n");
+
+ return 0;
+}
+
+subsys_initcall(layerscape_rcpm_init);
--
1.9.1
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