soc: fsl: add 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.

Note that this driver will not support PowerPC based QorIQ processors,
and it depends on PM wakeup source framework which provide collect
wake information.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index f9ad8ad54a7d652e73c58690041bdad8710c72d9..4df32bc4c7a6ec38e262d059f0ad25c94864bc2b 100644 (file)
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -40,4 +40,14 @@ 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 && (ARM || ARM64)
+       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.
+         Note that currently this driver will not support PowerPC based
+         QorIQ processor.
 endmenu

diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index 71dee8d0d1f0c8830d7c7f197c4b0d9b62c2e268..906f1cd8af01fd195297c89e1c5f0cf576fc2529 100644 (file)
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -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

diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
new file mode 100644 (file)
index 0000000..a093dbe
--- /dev/null
+++ b/drivers/soc/fsl/rcpm.c
@@ -0,0 +1,151 @@
+// 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;
+};
+
+/**
+ * rcpm_pm_prepare - performs device-level tasks associated with power
+ * management, such as programming related to the wakeup source control.
+ * @dev: Device to handle.
+ *
+ */
+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];
+       u32 setting[RCPM_WAKEUP_CELL_MAX_SIZE] = {0};
+
+       rcpm = dev_get_drvdata(dev);
+       if (!rcpm)
+               return -EINVAL;
+
+       base = rcpm->ippdexpcr_base;
+       idx = wakeup_sources_read_lock();
+
+       /* Begin with first registered wakeup source */
+       for_each_wakeup_source(ws) {
+
+               /* skip object which is not attached to device */
+               if (!ws->dev || !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]))
+                       continue;
+
+               /* Property "#fsl,rcpm-wakeup-cells" of rcpm node defines the
+                * number of IPPDEXPCR register cells, and "fsl,rcpm-wakeup"
+                * of wakeup source IP contains an integer array: <phandle to
+                * RCPM node, IPPDEXPCR0 setting, IPPDEXPCR1 setting,
+                * IPPDEXPCR2 setting, etc>.
+                *
+                * So we will go thought them to collect setting data.
+                */
+               for (i = 0; i < rcpm->wakeup_cells; i++)
+                       setting[i] |= value[i + 1];
+       }
+
+       wakeup_sources_read_unlock(idx);
+
+       /* Program all IPPDEXPCRn once */
+       for (i = 0; i < rcpm->wakeup_cells; i++) {
+               u32 tmp = setting[i];
+               void __iomem *address = base + i * 4;
+
+               if (!tmp)
+                       continue;
+
+               /* We can only OR related bits */
+               if (rcpm->little_endian) {
+                       tmp |= ioread32(address);
+                       iowrite32(tmp, address);
+               } else {
+                       tmp |= ioread32be(address);
+                       iowrite32be(tmp, address);
+               }
+       }
+
+       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);