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soc: add microchip polarfire soc system controller
This driver provides an interface for other drivers to access the functions of the system controller on the Microchip PolarFire SoC. Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20220217101349.2374873-2-conor.dooley@microchip.com
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Conor Dooley
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Nicolas Ferre
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Feb 25, 2022
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config POLARFIRE_SOC_SYS_CTRL | ||
tristate "POLARFIRE_SOC_SYS_CTRL" | ||
depends on POLARFIRE_SOC_MAILBOX | ||
help | ||
This driver adds support for the PolarFire SoC (MPFS) system controller. | ||
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To compile this driver as a module, choose M here. the | ||
module will be called mpfs_system_controller. | ||
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If unsure, say N. |
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obj-$(CONFIG_POLARFIRE_SOC_SYS_CTRL) += mpfs-sys-controller.o |
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// SPDX-License-Identifier: GPL-2.0 | ||
/* | ||
* Microchip PolarFire SoC (MPFS) system controller driver | ||
* | ||
* Copyright (c) 2020-2021 Microchip Corporation. All rights reserved. | ||
* | ||
* Author: Conor Dooley <conor.dooley@microchip.com> | ||
* | ||
*/ | ||
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#include <linux/slab.h> | ||
#include <linux/kref.h> | ||
#include <linux/module.h> | ||
#include <linux/interrupt.h> | ||
#include <linux/of_platform.h> | ||
#include <linux/mailbox_client.h> | ||
#include <linux/platform_device.h> | ||
#include <soc/microchip/mpfs.h> | ||
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static DEFINE_MUTEX(transaction_lock); | ||
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struct mpfs_sys_controller { | ||
struct mbox_client client; | ||
struct mbox_chan *chan; | ||
struct completion c; | ||
struct kref consumers; | ||
}; | ||
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int mpfs_blocking_transaction(struct mpfs_sys_controller *sys_controller, struct mpfs_mss_msg *msg) | ||
{ | ||
int ret, err; | ||
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err = mutex_lock_interruptible(&transaction_lock); | ||
if (err) | ||
return err; | ||
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reinit_completion(&sys_controller->c); | ||
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ret = mbox_send_message(sys_controller->chan, msg); | ||
if (ret >= 0) { | ||
if (wait_for_completion_timeout(&sys_controller->c, HZ)) { | ||
ret = 0; | ||
} else { | ||
ret = -ETIMEDOUT; | ||
dev_warn(sys_controller->client.dev, | ||
"MPFS sys controller transaction timeout\n"); | ||
} | ||
} else { | ||
dev_err(sys_controller->client.dev, | ||
"mpfs sys controller transaction returned %d\n", ret); | ||
} | ||
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mutex_unlock(&transaction_lock); | ||
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return ret; | ||
} | ||
EXPORT_SYMBOL(mpfs_blocking_transaction); | ||
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static void rx_callback(struct mbox_client *client, void *msg) | ||
{ | ||
struct mpfs_sys_controller *sys_controller = | ||
container_of(client, struct mpfs_sys_controller, client); | ||
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complete(&sys_controller->c); | ||
} | ||
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static void mpfs_sys_controller_delete(struct kref *kref) | ||
{ | ||
struct mpfs_sys_controller *sys_controller = container_of(kref, struct mpfs_sys_controller, | ||
consumers); | ||
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mbox_free_channel(sys_controller->chan); | ||
kfree(sys_controller); | ||
} | ||
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void mpfs_sys_controller_put(void *data) | ||
{ | ||
struct mpfs_sys_controller *sys_controller = data; | ||
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kref_put(&sys_controller->consumers, mpfs_sys_controller_delete); | ||
} | ||
EXPORT_SYMBOL(mpfs_sys_controller_put); | ||
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static struct platform_device subdevs[] = { | ||
{ | ||
.name = "mpfs-rng", | ||
.id = -1, | ||
}, | ||
{ | ||
.name = "mpfs-generic-service", | ||
.id = -1, | ||
} | ||
}; | ||
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static int mpfs_sys_controller_probe(struct platform_device *pdev) | ||
{ | ||
struct device *dev = &pdev->dev; | ||
struct mpfs_sys_controller *sys_controller; | ||
int i; | ||
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sys_controller = devm_kzalloc(dev, sizeof(*sys_controller), GFP_KERNEL); | ||
if (!sys_controller) | ||
return -ENOMEM; | ||
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sys_controller->client.dev = dev; | ||
sys_controller->client.rx_callback = rx_callback; | ||
sys_controller->client.tx_block = 1U; | ||
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sys_controller->chan = mbox_request_channel(&sys_controller->client, 0); | ||
if (IS_ERR(sys_controller->chan)) | ||
return dev_err_probe(dev, PTR_ERR(sys_controller->chan), | ||
"Failed to get mbox channel\n"); | ||
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init_completion(&sys_controller->c); | ||
kref_init(&sys_controller->consumers); | ||
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platform_set_drvdata(pdev, sys_controller); | ||
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dev_info(&pdev->dev, "Registered MPFS system controller\n"); | ||
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for (i = 0; i < ARRAY_SIZE(subdevs); i++) { | ||
subdevs[i].dev.parent = dev; | ||
if (platform_device_register(&subdevs[i])) | ||
dev_warn(dev, "Error registering sub device %s\n", subdevs[i].name); | ||
} | ||
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return 0; | ||
} | ||
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static int mpfs_sys_controller_remove(struct platform_device *pdev) | ||
{ | ||
struct mpfs_sys_controller *sys_controller = platform_get_drvdata(pdev); | ||
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mpfs_sys_controller_put(sys_controller); | ||
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return 0; | ||
} | ||
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static const struct of_device_id mpfs_sys_controller_of_match[] = { | ||
{.compatible = "microchip,mpfs-sys-controller", }, | ||
{}, | ||
}; | ||
MODULE_DEVICE_TABLE(of, mpfs_sys_controller_of_match); | ||
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struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev) | ||
{ | ||
const struct of_device_id *match; | ||
struct mpfs_sys_controller *sys_controller; | ||
int ret; | ||
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if (!dev->parent) | ||
goto err_no_device; | ||
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match = of_match_node(mpfs_sys_controller_of_match, dev->parent->of_node); | ||
of_node_put(dev->parent->of_node); | ||
if (!match) | ||
goto err_no_device; | ||
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sys_controller = dev_get_drvdata(dev->parent); | ||
if (!sys_controller) | ||
goto err_bad_device; | ||
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if (!kref_get_unless_zero(&sys_controller->consumers)) | ||
goto err_bad_device; | ||
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ret = devm_add_action_or_reset(dev, mpfs_sys_controller_put, sys_controller); | ||
if (ret) | ||
return ERR_PTR(ret); | ||
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return sys_controller; | ||
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err_no_device: | ||
dev_dbg(dev, "Parent device was not an MPFS system controller\n"); | ||
return ERR_PTR(-ENODEV); | ||
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err_bad_device: | ||
dev_dbg(dev, "MPFS system controller found but could not register as a sub device\n"); | ||
return ERR_PTR(-EPROBE_DEFER); | ||
} | ||
EXPORT_SYMBOL(mpfs_sys_controller_get); | ||
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static struct platform_driver mpfs_sys_controller_driver = { | ||
.driver = { | ||
.name = "mpfs-sys-controller", | ||
.of_match_table = mpfs_sys_controller_of_match, | ||
}, | ||
.probe = mpfs_sys_controller_probe, | ||
.remove = mpfs_sys_controller_remove, | ||
}; | ||
module_platform_driver(mpfs_sys_controller_driver); | ||
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MODULE_LICENSE("GPL v2"); | ||
MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>"); | ||
MODULE_DESCRIPTION("MPFS system controller driver"); |
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