[PATCH 1/9] armv8: pm: add rcpm module support
From: Yinbo Zhu <hidden>
Date: 2018-05-11 03:36:52
From: Yuantian Tang <redacted> The Run Control and Power Management (RCPM) module communicates with embedded cores, coherency modules, and other device platform module to provide run control and power management functionality Signed-off-by: Tang Yuantian <redacted> Signed-off-by: Yinbo Zhu <redacted> --- drivers/soc/fsl/Makefile | 1 + drivers/soc/fsl/rcpm.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 154 insertions(+), 0 deletions(-) create mode 100644 drivers/soc/fsl/rcpm.c
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index 629dab8..68fcd71 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile@@ -5,6 +5,7 @@ obj-$(CONFIG_FSL_DPAA) += qbman/ obj-$(CONFIG_QUICC_ENGINE) += qe/ obj-$(CONFIG_CPM) += qe/ +obj-$(CONFIG_SUSPEND) += rcpm.o obj-$(CONFIG_FSL_GUTS) += guts.o obj-$(CONFIG_FSL_LS2_CONSOLE) += ls2-console/ obj-$(CONFIG_LS_SOC_DRIVERS) += layerscape/
diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
new file mode 100644
index 0000000..ff0477b
--- /dev/null
+++ b/drivers/soc/fsl/rcpm.c@@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2016 NXP + * + * 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> + +/* RCPM register offset */ +#define RCPM_IPPDEXPCR0 0x140 + +#define RCPM_WAKEUP_CELL_SIZE 2 + +struct rcpm_config { + int ipp_num; + int ippdexpcr_offset; + u32 ippdexpcr[2]; + void *rcpm_reg_base; +}; + +static struct rcpm_config *rcpm; + +static inline void rcpm_reg_write(u32 offset, u32 value) +{ + iowrite32be(value, rcpm->rcpm_reg_base + offset); +} + +static inline u32 rcpm_reg_read(u32 offset) +{ + return ioread32be(rcpm->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_SIZE]; + int ret, i; + + if (!dev || !node || !device_may_wakeup(dev)) + return; + + /* + * Get the values in the "rcpm-wakeup" property. + * Three values are: + * The first is a pointer to the RCPM node. + * The second is the value of the ippdexpcr0 register. + * The third is the value of the ippdexpcr1 register. + */ + ret = of_property_read_u32_array(node, "fsl,rcpm-wakeup", + value, RCPM_WAKEUP_CELL_SIZE); + if (ret) + return; + + pr_debug("wakeup source: the device %s\n", node->full_name); + + for (i = 0; i < rcpm->ipp_num; i++) + rcpm->ippdexpcr[i] |= value[i + 1]; +} + +static int rcpm_suspend_prepare(void) +{ + int i; + + WARN_ON(!rcpm); + + for (i = 0; i < rcpm->ipp_num; i++) + rcpm->ippdexpcr[i] = 0; + + dpm_for_each_dev(NULL, rcpm_wakeup_fixup); + + for (i = 0; i < rcpm->ipp_num; i++) { + rcpm_reg_write(rcpm->ippdexpcr_offset + 4 * i, + rcpm->ippdexpcr[i]); + pr_debug("ippdexpcr%d = 0x%x\n", i, rcpm->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 struct rcpm_config rcpm_default_config = { + .ipp_num = 1, + .ippdexpcr_offset = RCPM_IPPDEXPCR0, +}; + +static const struct of_device_id rcpm_matches[] = { + { + .compatible = "fsl,qoriq-rcpm-2.1", + .data = &rcpm_default_config, + }, + {} +}; + +static struct notifier_block rcpm_suspend_notifier = { + .notifier_call = rcpm_suspend_notifier_call, +}; + +static int __init layerscape_rcpm_init(void) +{ + const struct of_device_id *match; + struct device_node *np; + + np = of_find_matching_node_and_match(NULL, rcpm_matches, &match); + if (!np) { + pr_err("Can't find the RCPM node.\n"); + return -EINVAL; + } + + if (match->data) + rcpm = (struct rcpm_config *)match->data; + else + return -EINVAL; + + rcpm->rcpm_reg_base = of_iomap(np, 0); + of_node_put(np); + if (!rcpm->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);
--
1.7.1