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remoteproc: pru: Add APIs to get and put the PRU cores
Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU driver to allow client drivers to acquire and release the remoteproc device associated with a PRU core. The PRU cores are treated as resources with only one client owning it at a time. The pru_rproc_get() function returns the rproc handle corresponding to a PRU core identified by the device tree "ti,prus" property under the client node. The pru_rproc_put() is the complementary function to pru_rproc_get(). Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> Reviewed-by: Roger Quadros <rogerq@kernel.org> Link: https://lore.kernel.org/r/20230106121046.886863-4-danishanwar@ti.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
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@ -2,12 +2,14 @@
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/*
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* PRU-ICSS remoteproc driver for various TI SoCs
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*
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* Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/
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* Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/
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*
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* Author(s):
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* Suman Anna <s-anna@ti.com>
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* Andrew F. Davis <afd@ti.com>
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* Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments
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* Puranjay Mohan <p-mohan@ti.com>
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* Md Danish Anwar <danishanwar@ti.com>
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*/
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#include <linux/bitops.h>
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@ -112,6 +114,8 @@ struct pru_private_data {
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* @rproc: remoteproc pointer for this PRU core
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* @data: PRU core specific data
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* @mem_regions: data for each of the PRU memory regions
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* @client_np: client device node
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* @lock: mutex to protect client usage
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* @fw_name: name of firmware image used during loading
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* @mapped_irq: virtual interrupt numbers of created fw specific mapping
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* @pru_interrupt_map: pointer to interrupt mapping description (firmware)
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@ -127,6 +131,8 @@ struct pru_rproc {
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struct rproc *rproc;
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const struct pru_private_data *data;
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struct pruss_mem_region mem_regions[PRU_IOMEM_MAX];
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struct device_node *client_np;
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struct mutex lock;
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const char *fw_name;
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unsigned int *mapped_irq;
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struct pru_irq_rsc *pru_interrupt_map;
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@ -147,6 +153,120 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
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writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
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}
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static struct rproc *__pru_rproc_get(struct device_node *np, int index)
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{
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struct rproc *rproc;
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phandle rproc_phandle;
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int ret;
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ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle);
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if (ret)
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return ERR_PTR(ret);
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rproc = rproc_get_by_phandle(rproc_phandle);
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if (!rproc) {
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ret = -EPROBE_DEFER;
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return ERR_PTR(ret);
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}
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/* make sure it is PRU rproc */
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if (!is_pru_rproc(rproc->dev.parent)) {
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rproc_put(rproc);
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return ERR_PTR(-ENODEV);
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}
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return rproc;
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}
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/**
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* pru_rproc_get() - get the PRU rproc instance from a device node
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* @np: the user/client device node
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* @index: index to use for the ti,prus property
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* @pru_id: optional pointer to return the PRU remoteproc processor id
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*
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* This function looks through a client device node's "ti,prus" property at
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* index @index and returns the rproc handle for a valid PRU remote processor if
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* found. The function allows only one user to own the PRU rproc resource at a
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* time. Caller must call pru_rproc_put() when done with using the rproc, not
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* required if the function returns a failure.
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*
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* When optional @pru_id pointer is passed the PRU remoteproc processor id is
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* returned.
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*
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* Return: rproc handle on success, and an ERR_PTR on failure using one
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* of the following error values
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* -ENODEV if device is not found
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* -EBUSY if PRU is already acquired by anyone
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* -EPROBE_DEFER is PRU device is not probed yet
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*/
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struct rproc *pru_rproc_get(struct device_node *np, int index,
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enum pruss_pru_id *pru_id)
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{
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struct rproc *rproc;
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struct pru_rproc *pru;
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struct device *dev;
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int ret;
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rproc = __pru_rproc_get(np, index);
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if (IS_ERR(rproc))
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return rproc;
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pru = rproc->priv;
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dev = &rproc->dev;
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mutex_lock(&pru->lock);
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if (pru->client_np) {
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mutex_unlock(&pru->lock);
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ret = -EBUSY;
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goto err_no_rproc_handle;
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}
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pru->client_np = np;
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mutex_unlock(&pru->lock);
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if (pru_id)
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*pru_id = pru->id;
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return rproc;
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err_no_rproc_handle:
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rproc_put(rproc);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(pru_rproc_get);
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/**
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* pru_rproc_put() - release the PRU rproc resource
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* @rproc: the rproc resource to release
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*
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* Releases the PRU rproc resource and makes it available to other
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* users.
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*/
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void pru_rproc_put(struct rproc *rproc)
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{
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struct pru_rproc *pru;
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if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent))
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return;
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pru = rproc->priv;
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mutex_lock(&pru->lock);
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if (!pru->client_np) {
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mutex_unlock(&pru->lock);
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return;
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}
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pru->client_np = NULL;
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mutex_unlock(&pru->lock);
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rproc_put(rproc);
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}
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EXPORT_SYMBOL_GPL(pru_rproc_put);
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static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
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{
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return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
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@ -817,6 +937,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
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pru->pruss = platform_get_drvdata(ppdev);
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pru->rproc = rproc;
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pru->fw_name = fw_name;
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pru->client_np = NULL;
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mutex_init(&pru->lock);
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for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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@ -905,7 +1027,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match);
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static struct platform_driver pru_rproc_driver = {
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.driver = {
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.name = "pru-rproc",
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.name = PRU_RPROC_DRVNAME,
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.of_match_table = pru_rproc_match,
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.suppress_bind_attrs = true,
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},
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@ -917,5 +1039,7 @@ module_platform_driver(pru_rproc_driver);
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MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
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MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>");
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MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>");
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MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>");
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MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver");
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MODULE_LICENSE("GPL v2");
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@ -28,4 +28,34 @@ enum pruss_pru_id {
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PRUSS_NUM_PRUS,
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};
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struct device_node;
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#if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
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struct rproc *pru_rproc_get(struct device_node *np, int index,
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enum pruss_pru_id *pru_id);
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void pru_rproc_put(struct rproc *rproc);
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#else
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static inline struct rproc *
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pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline void pru_rproc_put(struct rproc *rproc) { }
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#endif /* CONFIG_PRU_REMOTEPROC */
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static inline bool is_pru_rproc(struct device *dev)
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{
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const char *drv_name = dev_driver_string(dev);
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if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME)))
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return false;
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return true;
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}
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#endif /* __LINUX_PRUSS_H */
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