Commit 1019fa48 authored by Andrew Davis's avatar Andrew Davis Committed by Greg Kroah-Hartman
Browse files

uio: pruss: Remove this driver 



This UIO driver was used to control the PRU processors found on various
TI SoCs. It was created before the Remoteproc framework, but now with
that we have a standard way to program and manage the PRU processors.
The proper PRU Remoteproc driver should be used instead of this driver.

This driver only supported the original class of PRUSS (OMAP-L1xx /
AM17xx / AM18xx / TMS320C674x / DA8xx) but when these platforms were
switched to use Device Tree the support for DT was not added to this
driver and so it is now unused/unusable. Support for these platforms
can be added to the proper PRU Remoteproc driver if ever needed.

Remove this driver.

Signed-off-by: default avatarAndrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20240410144803.126831-1-afd@ti.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b2c6a73f

drivers/uio/Kconfig

+0 −18
Original line number Diff line number Diff line
@@ -125,24 +125,6 @@ config UIO_FSL_ELBC_GPCM_NETX5152 
	  Information about this hardware can be found at:

	  http://www.hilscher.com/netx



config UIO_PRUSS

	tristate "Texas Instruments PRUSS driver"

	select GENERIC_ALLOCATOR

	depends on HAS_IOMEM && HAS_DMA

	help

	  PRUSS driver for OMAPL138/DA850/AM18XX devices

	  PRUSS driver requires user space components, examples and user space

	  driver is available from below SVN repo - you may use anonymous login



	  https://gforge.ti.com/gf/project/pru_sw/



	  More info on API is available at below wiki



	  http://processors.wiki.ti.com/index.php/PRU_Linux_Application_Loader



	  To compile this driver as a module, choose M here: the module

	  will be called uio_pruss.



config UIO_MF624

	tristate "Humusoft MF624 DAQ PCI card driver"

	depends on PCI

drivers/uio/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -7,7 +7,6 @@ obj-$(CONFIG_UIO_AEC) += uio_aec.o 
obj-$(CONFIG_UIO_SERCOS3)	+= uio_sercos3.o

obj-$(CONFIG_UIO_PCI_GENERIC)	+= uio_pci_generic.o

obj-$(CONFIG_UIO_NETX)	+= uio_netx.o

obj-$(CONFIG_UIO_PRUSS)         += uio_pruss.o

obj-$(CONFIG_UIO_MF624)         += uio_mf624.o

obj-$(CONFIG_UIO_FSL_ELBC_GPCM)	+= uio_fsl_elbc_gpcm.o

obj-$(CONFIG_UIO_HV_GENERIC)	+= uio_hv_generic.o

drivers/uio/uio_pruss.c

deleted100644 → 0
+0 −255
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)

 *

 * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM,

 * and DDR RAM to user space for applications interacting with PRUSS firmware

 *

 * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/

 */

#include <linux/device.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/platform_device.h>

#include <linux/uio_driver.h>

#include <linux/platform_data/uio_pruss.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/dma-mapping.h>

#include <linux/sizes.h>

#include <linux/slab.h>

#include <linux/genalloc.h>



#define DRV_NAME "pruss_uio"

#define DRV_VERSION "1.0"



static int sram_pool_sz = SZ_16K;

module_param(sram_pool_sz, int, 0);

MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");



static int extram_pool_sz = SZ_256K;

module_param(extram_pool_sz, int, 0);

MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");



/*

 * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt

 * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS

 * firmware and user space application, async notification from PRU firmware

 * to user space application

 * 3	PRU_EVTOUT0

 * 4	PRU_EVTOUT1

 * 5	PRU_EVTOUT2

 * 6	PRU_EVTOUT3

 * 7	PRU_EVTOUT4

 * 8	PRU_EVTOUT5

 * 9	PRU_EVTOUT6

 * 10	PRU_EVTOUT7

*/

#define MAX_PRUSS_EVT	8



#define PINTC_HIDISR	0x0038

#define PINTC_HIPIR	0x0900

#define HIPIR_NOPEND	0x80000000

#define PINTC_HIER	0x1500



struct uio_pruss_dev {

	struct uio_info *info;

	struct clk *pruss_clk;

	dma_addr_t sram_paddr;

	dma_addr_t ddr_paddr;

	void __iomem *prussio_vaddr;

	unsigned long sram_vaddr;

	void *ddr_vaddr;

	unsigned int hostirq_start;

	unsigned int pintc_base;

	struct gen_pool *sram_pool;

};



static irqreturn_t pruss_handler(int irq, struct uio_info *info)

{

	struct uio_pruss_dev *gdev = info->priv;

	int intr_bit = (irq - gdev->hostirq_start + 2);

	int val, intr_mask = (1 << intr_bit);

	void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;

	void __iomem *intren_reg = base + PINTC_HIER;

	void __iomem *intrdis_reg = base + PINTC_HIDISR;

	void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);



	val = ioread32(intren_reg);

	/* Is interrupt enabled and active ? */

	if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))

		return IRQ_NONE;

	/* Disable interrupt */

	iowrite32(intr_bit, intrdis_reg);

	return IRQ_HANDLED;

}



static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)

{

	int cnt;

	struct uio_info *p = gdev->info;



	for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {

		uio_unregister_device(p);

	}

	iounmap(gdev->prussio_vaddr);

	if (gdev->ddr_vaddr) {

		dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,

			gdev->ddr_paddr);

	}

	if (gdev->sram_vaddr)

		gen_pool_free(gdev->sram_pool,

			      gdev->sram_vaddr,

			      sram_pool_sz);

	clk_disable(gdev->pruss_clk);

}



static int pruss_probe(struct platform_device *pdev)

{

	struct uio_info *p;

	struct uio_pruss_dev *gdev;

	struct resource *regs_prussio;

	struct device *dev = &pdev->dev;

	int ret, cnt, i, len;

	struct uio_pruss_pdata *pdata = dev_get_platdata(dev);



	gdev = devm_kzalloc(dev, sizeof(struct uio_pruss_dev), GFP_KERNEL);

	if (!gdev)

		return -ENOMEM;



	gdev->info = devm_kcalloc(dev, MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);

	if (!gdev->info)

		return -ENOMEM;



	/* Power on PRU in case its not done as part of boot-loader */

	gdev->pruss_clk = devm_clk_get(dev, "pruss");

	if (IS_ERR(gdev->pruss_clk)) {

		dev_err(dev, "Failed to get clock\n");

		return PTR_ERR(gdev->pruss_clk);

	}



	ret = clk_enable(gdev->pruss_clk);

	if (ret) {

		dev_err(dev, "Failed to enable clock\n");

		return ret;

	}



	regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!regs_prussio) {

		dev_err(dev, "No PRUSS I/O resource specified\n");

		ret = -EIO;

		goto err_clk_disable;

	}



	if (!regs_prussio->start) {

		dev_err(dev, "Invalid memory resource\n");

		ret = -EIO;

		goto err_clk_disable;

	}



	if (pdata->sram_pool) {

		gdev->sram_pool = pdata->sram_pool;

		gdev->sram_vaddr =

			(unsigned long)gen_pool_dma_alloc(gdev->sram_pool,

					sram_pool_sz, &gdev->sram_paddr);

		if (!gdev->sram_vaddr) {

			dev_err(dev, "Could not allocate SRAM pool\n");

			ret = -ENOMEM;

			goto err_clk_disable;

		}

	}



	gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,

				&(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);

	if (!gdev->ddr_vaddr) {

		dev_err(dev, "Could not allocate external memory\n");

		ret = -ENOMEM;

		goto err_free_sram;

	}



	len = resource_size(regs_prussio);

	gdev->prussio_vaddr = ioremap(regs_prussio->start, len);

	if (!gdev->prussio_vaddr) {

		dev_err(dev, "Can't remap PRUSS I/O  address range\n");

		ret = -ENOMEM;

		goto err_free_ddr_vaddr;

	}



	ret = platform_get_irq(pdev, 0);

	if (ret < 0)

		goto err_unmap;



	gdev->hostirq_start = ret;

	gdev->pintc_base = pdata->pintc_base;



	for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {

		p->mem[0].addr = regs_prussio->start;

		p->mem[0].size = resource_size(regs_prussio);

		p->mem[0].memtype = UIO_MEM_PHYS;



		p->mem[1].addr = gdev->sram_paddr;

		p->mem[1].size = sram_pool_sz;

		p->mem[1].memtype = UIO_MEM_PHYS;



		p->mem[2].addr = (uintptr_t) gdev->ddr_vaddr;

		p->mem[2].dma_addr = gdev->ddr_paddr;

		p->mem[2].size = extram_pool_sz;

		p->mem[2].memtype = UIO_MEM_DMA_COHERENT;

		p->mem[2].dma_device = dev;



		p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt);

		p->version = DRV_VERSION;



		/* Register PRUSS IRQ lines */

		p->irq = gdev->hostirq_start + cnt;

		p->handler = pruss_handler;

		p->priv = gdev;



		ret = uio_register_device(dev, p);

		if (ret < 0)

			goto err_unloop;

	}



	platform_set_drvdata(pdev, gdev);

	return 0;



err_unloop:

	for (i = 0, p = gdev->info; i < cnt; i++, p++) {

		uio_unregister_device(p);

	}

err_unmap:

	iounmap(gdev->prussio_vaddr);

err_free_ddr_vaddr:

	dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,

			  gdev->ddr_paddr);

err_free_sram:

	if (pdata->sram_pool)

		gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);

err_clk_disable:

	clk_disable(gdev->pruss_clk);



	return ret;

}



static int pruss_remove(struct platform_device *dev)

{

	struct uio_pruss_dev *gdev = platform_get_drvdata(dev);



	pruss_cleanup(&dev->dev, gdev);

	return 0;

}



static struct platform_driver pruss_driver = {

	.probe = pruss_probe,

	.remove = pruss_remove,

	.driver = {

		   .name = DRV_NAME,

		   },

};



module_platform_driver(pruss_driver);



MODULE_LICENSE("GPL v2");

MODULE_VERSION(DRV_VERSION);

MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");

MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");

include/linux/platform_data/uio_pruss.h

deleted100644 → 0
+0 −18
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * include/linux/platform_data/uio_pruss.h

 *

 * Platform data for uio_pruss driver

 *

 * Copyright (C) 2010-11 Texas Instruments Incorporated - https://www.ti.com/

 */



#ifndef _UIO_PRUSS_H_

#define _UIO_PRUSS_H_



/* To configure the PRUSS INTC base offset for UIO driver */

struct uio_pruss_pdata {

	u32		pintc_base;

	struct gen_pool *sram_pool;

};

#endif /* _UIO_PRUSS_H_ */