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![Suman Anna](/assets/img/avatar_default.png)
The PRUSS CFG module is represented as a syscon node and is currently managed by the PRUSS platform driver. Add easy accessor functions to set GPI mode, MII_RT event enable/disable and XFR (XIN XOUT) enable/disable to enable the PRUSS Ethernet usecase. These functions reuse the generic pruss_cfg_update() API function. Signed-off-by: Suman Anna <s-anna@ti.com> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Puranjay Mohan <p-mohan@ti.com> Reviewed-by: Roger Quadros <rogerq@kernel.org> Reviewed-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> Link: https://lore.kernel.org/r/20230414045542.3249939-5-danishanwar@ti.com Signed-off-by: Nishanth Menon <nm@ti.com>
617 lines
15 KiB
C
617 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PRU-ICSS platform driver for various TI SoCs
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*
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* Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
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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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* Tero Kristo <t-kristo@ti.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/pruss_driver.h>
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#include <linux/regmap.h>
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#include <linux/remoteproc.h>
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#include <linux/slab.h>
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#include "pruss.h"
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/**
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* struct pruss_private_data - PRUSS driver private data
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* @has_no_sharedram: flag to indicate the absence of PRUSS Shared Data RAM
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* @has_core_mux_clock: flag to indicate the presence of PRUSS core clock
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*/
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struct pruss_private_data {
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bool has_no_sharedram;
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bool has_core_mux_clock;
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};
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/**
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* pruss_get() - get the pruss for a given PRU remoteproc
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* @rproc: remoteproc handle of a PRU instance
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*
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* Finds the parent pruss device for a PRU given the @rproc handle of the
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* PRU remote processor. This function increments the pruss device's refcount,
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* so always use pruss_put() to decrement it back once pruss isn't needed
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* anymore.
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*
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* This API doesn't check if @rproc is valid or not. It is expected the caller
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* will have done a pru_rproc_get() on @rproc, before calling this API to make
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* sure that @rproc is valid.
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*
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* Return: pruss handle on success, and an ERR_PTR on failure using one
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* of the following error values
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* -EINVAL if invalid parameter
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* -ENODEV if PRU device or PRUSS device is not found
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*/
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struct pruss *pruss_get(struct rproc *rproc)
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{
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struct pruss *pruss;
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struct device *dev;
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struct platform_device *ppdev;
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if (IS_ERR_OR_NULL(rproc))
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return ERR_PTR(-EINVAL);
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dev = &rproc->dev;
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/* make sure it is PRU rproc */
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if (!dev->parent || !is_pru_rproc(dev->parent))
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return ERR_PTR(-ENODEV);
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ppdev = to_platform_device(dev->parent->parent);
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pruss = platform_get_drvdata(ppdev);
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if (!pruss)
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return ERR_PTR(-ENODEV);
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get_device(pruss->dev);
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return pruss;
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}
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EXPORT_SYMBOL_GPL(pruss_get);
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/**
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* pruss_put() - decrement pruss device's usecount
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* @pruss: pruss handle
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*
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* Complimentary function for pruss_get(). Needs to be called
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* after the PRUSS is used, and only if the pruss_get() succeeds.
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*/
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void pruss_put(struct pruss *pruss)
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{
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if (IS_ERR_OR_NULL(pruss))
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return;
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put_device(pruss->dev);
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}
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EXPORT_SYMBOL_GPL(pruss_put);
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/**
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* pruss_request_mem_region() - request a memory resource
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* @pruss: the pruss instance
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* @mem_id: the memory resource id
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* @region: pointer to memory region structure to be filled in
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*
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* This function allows a client driver to request a memory resource,
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* and if successful, will let the client driver own the particular
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* memory region until released using the pruss_release_mem_region()
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* API.
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*
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* Return: 0 if requested memory region is available (in such case pointer to
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* memory region is returned via @region), an error otherwise
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*/
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int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
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struct pruss_mem_region *region)
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{
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if (!pruss || !region || mem_id >= PRUSS_MEM_MAX)
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return -EINVAL;
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mutex_lock(&pruss->lock);
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if (pruss->mem_in_use[mem_id]) {
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mutex_unlock(&pruss->lock);
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return -EBUSY;
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}
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*region = pruss->mem_regions[mem_id];
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pruss->mem_in_use[mem_id] = region;
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mutex_unlock(&pruss->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pruss_request_mem_region);
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/**
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* pruss_release_mem_region() - release a memory resource
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* @pruss: the pruss instance
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* @region: the memory region to release
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*
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* This function is the complimentary function to
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* pruss_request_mem_region(), and allows the client drivers to
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* release back a memory resource.
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*
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* Return: 0 on success, an error code otherwise
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*/
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int pruss_release_mem_region(struct pruss *pruss,
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struct pruss_mem_region *region)
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{
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int id;
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if (!pruss || !region)
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return -EINVAL;
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mutex_lock(&pruss->lock);
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/* find out the memory region being released */
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for (id = 0; id < PRUSS_MEM_MAX; id++) {
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if (pruss->mem_in_use[id] == region)
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break;
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}
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if (id == PRUSS_MEM_MAX) {
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mutex_unlock(&pruss->lock);
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return -EINVAL;
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}
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pruss->mem_in_use[id] = NULL;
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mutex_unlock(&pruss->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pruss_release_mem_region);
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/**
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* pruss_cfg_get_gpmux() - get the current GPMUX value for a PRU device
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* @pruss: pruss instance
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* @pru_id: PRU identifier (0-1)
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* @mux: pointer to store the current mux value into
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int pruss_cfg_get_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 *mux)
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{
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int ret;
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u32 val;
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if (pru_id >= PRUSS_NUM_PRUS || !mux)
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return -EINVAL;
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ret = pruss_cfg_read(pruss, PRUSS_CFG_GPCFG(pru_id), &val);
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if (!ret)
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*mux = (u8)((val & PRUSS_GPCFG_PRU_MUX_SEL_MASK) >>
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PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pruss_cfg_get_gpmux);
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/**
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* pruss_cfg_set_gpmux() - set the GPMUX value for a PRU device
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* @pruss: pruss instance
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* @pru_id: PRU identifier (0-1)
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* @mux: new mux value for PRU
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int pruss_cfg_set_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 mux)
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{
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if (mux >= PRUSS_GP_MUX_SEL_MAX ||
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pru_id >= PRUSS_NUM_PRUS)
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return -EINVAL;
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return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
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PRUSS_GPCFG_PRU_MUX_SEL_MASK,
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(u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
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}
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EXPORT_SYMBOL_GPL(pruss_cfg_set_gpmux);
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/**
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* pruss_cfg_gpimode() - set the GPI mode of the PRU
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* @pruss: the pruss instance handle
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* @pru_id: id of the PRU core within the PRUSS
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* @mode: GPI mode to set
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*
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* Sets the GPI mode for a given PRU by programming the
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* corresponding PRUSS_CFG_GPCFGx register
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int pruss_cfg_gpimode(struct pruss *pruss, enum pruss_pru_id pru_id,
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enum pruss_gpi_mode mode)
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{
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if (pru_id >= PRUSS_NUM_PRUS || mode >= PRUSS_GPI_MODE_MAX)
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return -EINVAL;
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return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
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PRUSS_GPCFG_PRU_GPI_MODE_MASK,
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mode << PRUSS_GPCFG_PRU_GPI_MODE_SHIFT);
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}
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EXPORT_SYMBOL_GPL(pruss_cfg_gpimode);
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/**
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* pruss_cfg_miirt_enable() - Enable/disable MII RT Events
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* @pruss: the pruss instance
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* @enable: enable/disable
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*
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* Enable/disable the MII RT Events for the PRUSS.
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable)
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{
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u32 set = enable ? PRUSS_MII_RT_EVENT_EN : 0;
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return pruss_cfg_update(pruss, PRUSS_CFG_MII_RT,
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PRUSS_MII_RT_EVENT_EN, set);
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}
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EXPORT_SYMBOL_GPL(pruss_cfg_miirt_enable);
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/**
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* pruss_cfg_xfr_enable() - Enable/disable XIN XOUT shift functionality
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* @pruss: the pruss instance
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* @pru_type: PRU core type identifier
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* @enable: enable/disable
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int pruss_cfg_xfr_enable(struct pruss *pruss, enum pru_type pru_type,
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bool enable)
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{
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u32 mask, set;
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switch (pru_type) {
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case PRU_TYPE_PRU:
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mask = PRUSS_SPP_XFER_SHIFT_EN;
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break;
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case PRU_TYPE_RTU:
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mask = PRUSS_SPP_RTU_XFR_SHIFT_EN;
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break;
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default:
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return -EINVAL;
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}
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set = enable ? mask : 0;
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return pruss_cfg_update(pruss, PRUSS_CFG_SPP, mask, set);
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}
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EXPORT_SYMBOL_GPL(pruss_cfg_xfr_enable);
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static void pruss_of_free_clk_provider(void *data)
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{
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struct device_node *clk_mux_np = data;
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of_clk_del_provider(clk_mux_np);
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of_node_put(clk_mux_np);
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}
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static void pruss_clk_unregister_mux(void *data)
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{
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clk_unregister_mux(data);
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}
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static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
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char *mux_name, struct device_node *clks_np)
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{
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struct device_node *clk_mux_np;
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struct device *dev = pruss->dev;
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char *clk_mux_name;
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unsigned int num_parents;
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const char **parent_names;
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void __iomem *reg;
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u32 reg_offset;
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int ret;
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clk_mux_np = of_get_child_by_name(clks_np, mux_name);
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if (!clk_mux_np) {
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dev_err(dev, "%pOF is missing its '%s' node\n", clks_np,
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mux_name);
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return -ENODEV;
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}
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num_parents = of_clk_get_parent_count(clk_mux_np);
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if (num_parents < 1) {
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dev_err(dev, "mux-clock %pOF must have parents\n", clk_mux_np);
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ret = -EINVAL;
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goto put_clk_mux_np;
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}
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parent_names = devm_kcalloc(dev, sizeof(*parent_names), num_parents,
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GFP_KERNEL);
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if (!parent_names) {
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ret = -ENOMEM;
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goto put_clk_mux_np;
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}
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of_clk_parent_fill(clk_mux_np, parent_names, num_parents);
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clk_mux_name = devm_kasprintf(dev, GFP_KERNEL, "%s.%pOFn",
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dev_name(dev), clk_mux_np);
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if (!clk_mux_name) {
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ret = -ENOMEM;
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goto put_clk_mux_np;
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}
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ret = of_property_read_u32(clk_mux_np, "reg", ®_offset);
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if (ret)
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goto put_clk_mux_np;
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reg = pruss->cfg_base + reg_offset;
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clk_mux = clk_register_mux(NULL, clk_mux_name, parent_names,
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num_parents, 0, reg, 0, 1, 0, NULL);
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if (IS_ERR(clk_mux)) {
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ret = PTR_ERR(clk_mux);
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goto put_clk_mux_np;
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}
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ret = devm_add_action_or_reset(dev, pruss_clk_unregister_mux, clk_mux);
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if (ret) {
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dev_err(dev, "failed to add clkmux unregister action %d", ret);
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goto put_clk_mux_np;
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}
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ret = of_clk_add_provider(clk_mux_np, of_clk_src_simple_get, clk_mux);
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if (ret)
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goto put_clk_mux_np;
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ret = devm_add_action_or_reset(dev, pruss_of_free_clk_provider,
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clk_mux_np);
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if (ret) {
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dev_err(dev, "failed to add clkmux free action %d", ret);
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goto put_clk_mux_np;
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}
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return 0;
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put_clk_mux_np:
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of_node_put(clk_mux_np);
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return ret;
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}
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static int pruss_clk_init(struct pruss *pruss, struct device_node *cfg_node)
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{
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const struct pruss_private_data *data;
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struct device_node *clks_np;
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struct device *dev = pruss->dev;
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int ret = 0;
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data = of_device_get_match_data(dev);
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clks_np = of_get_child_by_name(cfg_node, "clocks");
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if (!clks_np) {
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dev_err(dev, "%pOF is missing its 'clocks' node\n", cfg_node);
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return -ENODEV;
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}
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if (data && data->has_core_mux_clock) {
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ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux,
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"coreclk-mux", clks_np);
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if (ret) {
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dev_err(dev, "failed to setup coreclk-mux\n");
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goto put_clks_node;
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}
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}
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ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux",
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clks_np);
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if (ret) {
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dev_err(dev, "failed to setup iepclk-mux\n");
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goto put_clks_node;
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}
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put_clks_node:
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of_node_put(clks_np);
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return ret;
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}
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static struct regmap_config regmap_conf = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static int pruss_cfg_of_init(struct device *dev, struct pruss *pruss)
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{
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struct device_node *np = dev_of_node(dev);
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struct device_node *child;
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struct resource res;
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int ret;
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child = of_get_child_by_name(np, "cfg");
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if (!child) {
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dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
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return -ENODEV;
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}
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if (of_address_to_resource(child, 0, &res)) {
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ret = -ENOMEM;
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goto node_put;
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}
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pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res));
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if (!pruss->cfg_base) {
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ret = -ENOMEM;
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goto node_put;
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}
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regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child,
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(u64)res.start);
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regmap_conf.max_register = resource_size(&res) - 4;
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pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base,
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®map_conf);
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kfree(regmap_conf.name);
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if (IS_ERR(pruss->cfg_regmap)) {
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dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n",
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PTR_ERR(pruss->cfg_regmap));
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ret = PTR_ERR(pruss->cfg_regmap);
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goto node_put;
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}
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ret = pruss_clk_init(pruss, child);
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if (ret)
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dev_err(dev, "pruss_clk_init failed, ret = %d\n", ret);
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node_put:
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of_node_put(child);
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return ret;
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}
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static int pruss_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev_of_node(dev);
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struct device_node *child;
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struct pruss *pruss;
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struct resource res;
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int ret, i, index;
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const struct pruss_private_data *data;
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const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
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data = of_device_get_match_data(&pdev->dev);
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|
|
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
|
|
if (ret) {
|
|
dev_err(dev, "failed to set the DMA coherent mask");
|
|
return ret;
|
|
}
|
|
|
|
pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL);
|
|
if (!pruss)
|
|
return -ENOMEM;
|
|
|
|
pruss->dev = dev;
|
|
mutex_init(&pruss->lock);
|
|
|
|
child = of_get_child_by_name(np, "memories");
|
|
if (!child) {
|
|
dev_err(dev, "%pOF is missing its 'memories' node\n", child);
|
|
return -ENODEV;
|
|
}
|
|
|
|
for (i = 0; i < PRUSS_MEM_MAX; i++) {
|
|
/*
|
|
* On AM437x one of two PRUSS units don't contain Shared RAM,
|
|
* skip it
|
|
*/
|
|
if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2)
|
|
continue;
|
|
|
|
index = of_property_match_string(child, "reg-names",
|
|
mem_names[i]);
|
|
if (index < 0) {
|
|
of_node_put(child);
|
|
return index;
|
|
}
|
|
|
|
if (of_address_to_resource(child, index, &res)) {
|
|
of_node_put(child);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
|
|
resource_size(&res));
|
|
if (!pruss->mem_regions[i].va) {
|
|
dev_err(dev, "failed to parse and map memory resource %d %s\n",
|
|
i, mem_names[i]);
|
|
of_node_put(child);
|
|
return -ENOMEM;
|
|
}
|
|
pruss->mem_regions[i].pa = res.start;
|
|
pruss->mem_regions[i].size = resource_size(&res);
|
|
|
|
dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n",
|
|
mem_names[i], &pruss->mem_regions[i].pa,
|
|
pruss->mem_regions[i].size, pruss->mem_regions[i].va);
|
|
}
|
|
of_node_put(child);
|
|
|
|
platform_set_drvdata(pdev, pruss);
|
|
|
|
pm_runtime_enable(dev);
|
|
ret = pm_runtime_resume_and_get(dev);
|
|
if (ret < 0) {
|
|
dev_err(dev, "couldn't enable module\n");
|
|
goto rpm_disable;
|
|
}
|
|
|
|
ret = pruss_cfg_of_init(dev, pruss);
|
|
if (ret < 0)
|
|
goto rpm_put;
|
|
|
|
ret = devm_of_platform_populate(dev);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register child devices\n");
|
|
goto rpm_put;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rpm_put:
|
|
pm_runtime_put_sync(dev);
|
|
rpm_disable:
|
|
pm_runtime_disable(dev);
|
|
return ret;
|
|
}
|
|
|
|
static int pruss_remove(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
|
|
devm_of_platform_depopulate(dev);
|
|
|
|
pm_runtime_put_sync(dev);
|
|
pm_runtime_disable(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* instance-specific driver private data */
|
|
static const struct pruss_private_data am437x_pruss1_data = {
|
|
.has_no_sharedram = false,
|
|
};
|
|
|
|
static const struct pruss_private_data am437x_pruss0_data = {
|
|
.has_no_sharedram = true,
|
|
};
|
|
|
|
static const struct pruss_private_data am65x_j721e_pruss_data = {
|
|
.has_core_mux_clock = true,
|
|
};
|
|
|
|
static const struct of_device_id pruss_of_match[] = {
|
|
{ .compatible = "ti,am3356-pruss" },
|
|
{ .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, },
|
|
{ .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, },
|
|
{ .compatible = "ti,am5728-pruss" },
|
|
{ .compatible = "ti,k2g-pruss" },
|
|
{ .compatible = "ti,am654-icssg", .data = &am65x_j721e_pruss_data, },
|
|
{ .compatible = "ti,j721e-icssg", .data = &am65x_j721e_pruss_data, },
|
|
{ .compatible = "ti,am642-icssg", .data = &am65x_j721e_pruss_data, },
|
|
{ .compatible = "ti,am625-pruss", .data = &am65x_j721e_pruss_data, },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pruss_of_match);
|
|
|
|
static struct platform_driver pruss_driver = {
|
|
.driver = {
|
|
.name = "pruss",
|
|
.of_match_table = pruss_of_match,
|
|
},
|
|
.probe = pruss_probe,
|
|
.remove = pruss_remove,
|
|
};
|
|
module_platform_driver(pruss_driver);
|
|
|
|
MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
|
|
MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver");
|
|
MODULE_LICENSE("GPL v2");
|