@@ -40,4 +40,12 @@ config DPAA2_CONSOLE
/dev/dpaa2_mc_console and /dev/dpaa2_aiop_console,
which can be used to dump the Management Complex and AIOP
firmware logs.
+
+config FSL_RCPM
+ bool "Freescale RCPM support"
+ depends on PM_SLEEP
+ help
+ The NXP QorIQ Processors based on ARM Core have RCPM module
+ (Run Control and Power Management), which performs all device-level
+ tasks associated with power management, such as wakeup source control.
endmenu
@@ -6,6 +6,7 @@
obj-$(CONFIG_FSL_DPAA) += qbman/
obj-$(CONFIG_QUICC_ENGINE) += qe/
obj-$(CONFIG_CPM) += qe/
+obj-$(CONFIG_FSL_RCPM) += rcpm.o
obj-$(CONFIG_FSL_GUTS) += guts.o
obj-$(CONFIG_FSL_MC_DPIO) += dpio/
obj-$(CONFIG_DPAA2_CONSOLE) += dpaa2-console.o
new file mode 100644
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// rcpm.c - Freescale QorIQ RCPM driver
+//
+// Copyright 2019 NXP
+//
+// Author: Ran Wang <ran.wang_1@nxp.com>
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/kernel.h>
+
+#define RCPM_WAKEUP_CELL_MAX_SIZE 7
+
+struct rcpm {
+ unsigned int wakeup_cells;
+ void __iomem *ippdexpcr_base;
+ bool little_endian;
+};
+
+static int rcpm_pm_prepare(struct device *dev)
+{
+ int i, ret, idx;
+ void __iomem *base;
+ struct wakeup_source *ws;
+ struct rcpm *rcpm;
+ struct device_node *np = dev->of_node;
+ u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp;
+
+ rcpm = dev_get_drvdata(dev);
+ if (!rcpm)
+ return -EINVAL;
+
+ base = rcpm->ippdexpcr_base;
+
+ /* Begin with first registered wakeup source */
+ ws = wakeup_source_get_start(&idx);
+ do {
+ /* skip object which is not attached to device */
+ if (!ws->dev->parent)
+ continue;
+
+ ret = device_property_read_u32_array(ws->dev->parent,
+ "fsl,rcpm-wakeup", value,
+ rcpm->wakeup_cells + 1);
+
+ /* Wakeup source should refer to current rcpm device */
+ if (ret || (np->phandle != value[0])) {
+ dev_info(dev, "%s doesn't refer to this rcpm\n",
+ ws->name);
+ continue;
+ }
+
+ for (i = 0; i < rcpm->wakeup_cells; i++) {
+ /* We can only OR related bits */
+ if (value[i + 1]) {
+ if (rcpm->little_endian) {
+ tmp = ioread32(base + i * 4);
+ tmp |= value[i + 1];
+ iowrite32(tmp, base + i * 4);
+ } else {
+ tmp = ioread32be(base + i * 4);
+ tmp |= value[i + 1];
+ iowrite32be(tmp, base + i * 4);
+ }
+ }
+ }
+ } while (ws = wakeup_source_get_next(ws));
+
+ wakeup_source_get_stop(idx);
+
+ return 0;
+}
+
+static const struct dev_pm_ops rcpm_pm_ops = {
+ .prepare = rcpm_pm_prepare,
+};
+
+static int rcpm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *r;
+ struct rcpm *rcpm;
+ int ret;
+
+ rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
+ if (!rcpm)
+ return -ENOMEM;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r)
+ return -ENODEV;
+
+ rcpm->ippdexpcr_base = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(rcpm->ippdexpcr_base)) {
+ ret = PTR_ERR(rcpm->ippdexpcr_base);
+ return ret;
+ }
+
+ rcpm->little_endian = device_property_read_bool(
+ &pdev->dev, "little-endian");
+
+ ret = device_property_read_u32(&pdev->dev,
+ "#fsl,rcpm-wakeup-cells", &rcpm->wakeup_cells);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(&pdev->dev, rcpm);
+
+ return 0;
+}
+
+static const struct of_device_id rcpm_of_match[] = {
+ { .compatible = "fsl,qoriq-rcpm-2.1+", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rcpm_of_match);
+
+static struct platform_driver rcpm_driver = {
+ .driver = {
+ .name = "rcpm",
+ .of_match_table = rcpm_of_match,
+ .pm = &rcpm_pm_ops,
+ },
+ .probe = rcpm_probe,
+};
+
+module_platform_driver(rcpm_driver);
The NXP's QorIQ Processors based on ARM Core have RCPM module (Run Control and Power Management), which performs system level tasks associated with power management such as wakeup source control. This driver depends on PM wakeup source framework which help to collect wake information. Signed-off-by: Ran Wang <ran.wang_1@nxp.com> --- Change in v7: - Replace 'ws->dev' with 'ws->dev->parent' to get aligned with c8377adfa781 ("PM / wakeup: Show wakeup sources stats in sysfs") - Remove '+obj-y += ftm_alarm.o' since it is wrong. - Cosmetic work. Change in v6: - Adjust related API usage to meet wakeup.c's update in patch 1/3. Change in v5: - Fix v4 regression of the return value of wakeup_source_get_next() didn't pass to ws in while loop. - Rename wakeup_source member 'attached_dev' to 'dev'. - Rename property 'fsl,#rcpm-wakeup-cells' to '#fsl,rcpm-wakeup-cells'. please see https://lore.kernel.org/patchwork/patch/1101022/ Change in v4: - Remove extra ',' in author line of rcpm.c - Update usage of wakeup_source_get_next() to be less confusing to the reader, code logic remain the same. Change in v3: - Some whitespace ajdustment. Change in v2: - Rebase Kconfig and Makefile update to latest mainline. drivers/soc/fsl/Kconfig | 8 +++ drivers/soc/fsl/Makefile | 1 + drivers/soc/fsl/rcpm.c | 132 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 141 insertions(+) create mode 100644 drivers/soc/fsl/rcpm.c