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authorMD Danish Anwar <danishanwar@ti.com>2023-01-06 15:10:43 +0300
committerMathieu Poirier <mathieu.poirier@linaro.org>2023-01-06 19:14:22 +0300
commit919e8942548aa878d374b1b51aa68fdf751f18b8 (patch)
tree93ee41fcd0eeb366ec72084abc4ac42e71235ece /drivers/remoteproc
parent9b9ad70f28675c45ef93cfb6e4af9403cb7bd34c (diff)
downloadlinux-919e8942548aa878d374b1b51aa68fdf751f18b8.tar.xz
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>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/pru_rproc.c128
1 files changed, 126 insertions, 2 deletions
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index f8b196a2b72a..1036bfd446b6 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -2,12 +2,14 @@
/*
* PRU-ICSS remoteproc driver for various TI SoCs
*
- * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/
+ * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/
*
* Author(s):
* Suman Anna <s-anna@ti.com>
* Andrew F. Davis <afd@ti.com>
* Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments
+ * Puranjay Mohan <p-mohan@ti.com>
+ * Md Danish Anwar <danishanwar@ti.com>
*/
#include <linux/bitops.h>
@@ -112,6 +114,8 @@ struct pru_private_data {
* @rproc: remoteproc pointer for this PRU core
* @data: PRU core specific data
* @mem_regions: data for each of the PRU memory regions
+ * @client_np: client device node
+ * @lock: mutex to protect client usage
* @fw_name: name of firmware image used during loading
* @mapped_irq: virtual interrupt numbers of created fw specific mapping
* @pru_interrupt_map: pointer to interrupt mapping description (firmware)
@@ -127,6 +131,8 @@ struct pru_rproc {
struct rproc *rproc;
const struct pru_private_data *data;
struct pruss_mem_region mem_regions[PRU_IOMEM_MAX];
+ struct device_node *client_np;
+ struct mutex lock;
const char *fw_name;
unsigned int *mapped_irq;
struct pru_irq_rsc *pru_interrupt_map;
@@ -147,6 +153,120 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
}
+static struct rproc *__pru_rproc_get(struct device_node *np, int index)
+{
+ struct rproc *rproc;
+ phandle rproc_phandle;
+ int ret;
+
+ ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle);
+ if (ret)
+ return ERR_PTR(ret);
+
+ rproc = rproc_get_by_phandle(rproc_phandle);
+ if (!rproc) {
+ ret = -EPROBE_DEFER;
+ return ERR_PTR(ret);
+ }
+
+ /* make sure it is PRU rproc */
+ if (!is_pru_rproc(rproc->dev.parent)) {
+ rproc_put(rproc);
+ return ERR_PTR(-ENODEV);
+ }
+
+ return rproc;
+}
+
+/**
+ * pru_rproc_get() - get the PRU rproc instance from a device node
+ * @np: the user/client device node
+ * @index: index to use for the ti,prus property
+ * @pru_id: optional pointer to return the PRU remoteproc processor id
+ *
+ * This function looks through a client device node's "ti,prus" property at
+ * index @index and returns the rproc handle for a valid PRU remote processor if
+ * found. The function allows only one user to own the PRU rproc resource at a
+ * time. Caller must call pru_rproc_put() when done with using the rproc, not
+ * required if the function returns a failure.
+ *
+ * When optional @pru_id pointer is passed the PRU remoteproc processor id is
+ * returned.
+ *
+ * Return: rproc handle on success, and an ERR_PTR on failure using one
+ * of the following error values
+ * -ENODEV if device is not found
+ * -EBUSY if PRU is already acquired by anyone
+ * -EPROBE_DEFER is PRU device is not probed yet
+ */
+struct rproc *pru_rproc_get(struct device_node *np, int index,
+ enum pruss_pru_id *pru_id)
+{
+ struct rproc *rproc;
+ struct pru_rproc *pru;
+ struct device *dev;
+ int ret;
+
+ rproc = __pru_rproc_get(np, index);
+ if (IS_ERR(rproc))
+ return rproc;
+
+ pru = rproc->priv;
+ dev = &rproc->dev;
+
+ mutex_lock(&pru->lock);
+
+ if (pru->client_np) {
+ mutex_unlock(&pru->lock);
+ ret = -EBUSY;
+ goto err_no_rproc_handle;
+ }
+
+ pru->client_np = np;
+
+ mutex_unlock(&pru->lock);
+
+ if (pru_id)
+ *pru_id = pru->id;
+
+ return rproc;
+
+err_no_rproc_handle:
+ rproc_put(rproc);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(pru_rproc_get);
+
+/**
+ * pru_rproc_put() - release the PRU rproc resource
+ * @rproc: the rproc resource to release
+ *
+ * Releases the PRU rproc resource and makes it available to other
+ * users.
+ */
+void pru_rproc_put(struct rproc *rproc)
+{
+ struct pru_rproc *pru;
+
+ if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent))
+ return;
+
+ pru = rproc->priv;
+
+ mutex_lock(&pru->lock);
+
+ if (!pru->client_np) {
+ mutex_unlock(&pru->lock);
+ return;
+ }
+
+ pru->client_np = NULL;
+ mutex_unlock(&pru->lock);
+
+ rproc_put(rproc);
+}
+EXPORT_SYMBOL_GPL(pru_rproc_put);
+
static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
{
return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
@@ -817,6 +937,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
pru->pruss = platform_get_drvdata(ppdev);
pru->rproc = rproc;
pru->fw_name = fw_name;
+ pru->client_np = NULL;
+ mutex_init(&pru->lock);
for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
@@ -905,7 +1027,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match);
static struct platform_driver pru_rproc_driver = {
.driver = {
- .name = "pru-rproc",
+ .name = PRU_RPROC_DRVNAME,
.of_match_table = pru_rproc_match,
.suppress_bind_attrs = true,
},
@@ -917,5 +1039,7 @@ module_platform_driver(pru_rproc_driver);
MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>");
+MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>");
+MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>");
MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver");
MODULE_LICENSE("GPL v2");