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    SubjectRe: [PATCH v11 1/1] PRUSS UIO driver support
    On Sat, Mar 05, 2011 at 04:30:17AM +0530, Pratheesh Gangadhar wrote:
    > This patch implements PRUSS (Programmable Real-time Unit Sub System)
    > UIO driver which exports SOC resources associated with PRUSS like
    > I/O, memories and IRQs to user space. PRUSS is dual 32-bit RISC
    > processors which is efficient in performing embedded tasks that
    > require manipulation of packed memory mapped data structures and
    > handling system events that have tight real time constraints. This
    > driver is currently supported on Texas Instruments DA850, AM18xx and
    > OMAP-L138 devices.
    > For example, PRUSS runs firmware for real-time critical industrial
    > communication data link layer and communicates with application stack
    > running in user space via shared memory and IRQs.
    >
    > Signed-off-by: Pratheesh Gangadhar <pratheesh@ti.com>
    > Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    > Reviewed-by: Arnd Bergmann <arnd@arndb.de>

    Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>

    I think, we've got it. Thanks for your contribution and your patience.
    Not many UIO programmers hang on through 11 patch versions...

    Thanks,
    Hans

    > ---
    > drivers/uio/Kconfig | 17 ++
    > drivers/uio/Makefile | 1 +
    > drivers/uio/uio_pruss.c | 247 +++++++++++++++++++++++++++++++
    > include/linux/platform_data/uio_pruss.h | 25 +++
    > 4 files changed, 290 insertions(+), 0 deletions(-)
    > create mode 100644 drivers/uio/uio_pruss.c
    > create mode 100644 include/linux/platform_data/uio_pruss.h
    >
    > diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
    > index bb44079..6f3ea9b 100644
    > --- a/drivers/uio/Kconfig
    > +++ b/drivers/uio/Kconfig
    > @@ -94,4 +94,21 @@ config UIO_NETX
    > To compile this driver as a module, choose M here; the module
    > will be called uio_netx.
    >
    > +config UIO_PRUSS
    > + tristate "Texas Instruments PRUSS driver"
    > + depends on ARCH_DAVINCI_DA850
    > + 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.
    > +
    > endif
    > diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
    > index 18fd818..d4dd9a5 100644
    > --- a/drivers/uio/Makefile
    > +++ b/drivers/uio/Makefile
    > @@ -6,3 +6,4 @@ 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
    > diff --git a/drivers/uio/uio_pruss.c b/drivers/uio/uio_pruss.c
    > new file mode 100644
    > index 0000000..daf6e77
    > --- /dev/null
    > +++ b/drivers/uio/uio_pruss.c
    > @@ -0,0 +1,247 @@
    > +/*
    > + * 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/
    > + *
    > + * This program is free software; you can redistribute it and/or
    > + * modify it under the terms of the GNU General Public License as
    > + * published by the Free Software Foundation version 2.
    > + *
    > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
    > + * kind, whether express or implied; without even the implied warranty
    > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + */
    > +#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/slab.h>
    > +#include <mach/sram.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 upto 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;
    > + void *sram_vaddr;
    > + void *ddr_vaddr;
    > + unsigned int hostirq_start;
    > + unsigned int pintc_base;
    > +};
    > +
    > +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 platform_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);
    > + kfree(p->name);
    > + }
    > + iounmap(gdev->prussio_vaddr);
    > + if (gdev->ddr_vaddr) {
    > + dma_free_coherent(&dev->dev, extram_pool_sz, gdev->ddr_vaddr,
    > + gdev->ddr_paddr);
    > + }
    > + if (gdev->sram_vaddr)
    > + sram_free(gdev->sram_vaddr, sram_pool_sz);
    > + kfree(gdev->info);
    > + clk_put(gdev->pruss_clk);
    > + kfree(gdev);
    > +}
    > +
    > +static int __devinit pruss_probe(struct platform_device *dev)
    > +{
    > + struct uio_info *p;
    > + struct uio_pruss_dev *gdev;
    > + struct resource *regs_prussio;
    > + int ret = -ENODEV, cnt = 0, len;
    > + struct uio_pruss_pdata *pdata = dev->dev.platform_data;
    > +
    > + gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
    > + if (!gdev)
    > + return -ENOMEM;
    > +
    > + gdev->info = kzalloc(sizeof(*p) * MAX_PRUSS_EVT, GFP_KERNEL);
    > + if (!gdev->info) {
    > + kfree(gdev);
    > + return -ENOMEM;
    > + }
    > + /* Power on PRU in case its not done as part of boot-loader */
    > + gdev->pruss_clk = clk_get(&dev->dev, "pruss");
    > + if (IS_ERR(gdev->pruss_clk)) {
    > + dev_err(&dev->dev, "Failed to get clock\n");
    > + kfree(gdev->info);
    > + kfree(gdev);
    > + ret = PTR_ERR(gdev->pruss_clk);
    > + return ret;
    > + } else {
    > + clk_enable(gdev->pruss_clk);
    > + }
    > +
    > + regs_prussio = platform_get_resource(dev, IORESOURCE_MEM, 0);
    > + if (!regs_prussio) {
    > + dev_err(&dev->dev, "No PRUSS I/O resource specified\n");
    > + goto out_free;
    > + }
    > +
    > + if (!regs_prussio->start) {
    > + dev_err(&dev->dev, "Invalid memory resource\n");
    > + goto out_free;
    > + }
    > +
    > + gdev->sram_vaddr = sram_alloc(sram_pool_sz, &(gdev->sram_paddr));
    > + if (!gdev->sram_vaddr) {
    > + dev_err(&dev->dev, "Could not allocate SRAM pool\n");
    > + goto out_free;
    > + }
    > +
    > + gdev->ddr_vaddr = dma_alloc_coherent(&dev->dev, extram_pool_sz,
    > + &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
    > + if (!gdev->ddr_vaddr) {
    > + dev_err(&dev->dev, "Could not allocate external memory\n");
    > + goto out_free;
    > + }
    > +
    > + len = resource_size(regs_prussio);
    > + gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
    > + if (!gdev->prussio_vaddr) {
    > + dev_err(&dev->dev, "Can't remap PRUSS I/O address range\n");
    > + goto out_free;
    > + }
    > +
    > + gdev->pintc_base = pdata->pintc_base;
    > + gdev->hostirq_start = platform_get_irq(dev, 0);
    > +
    > + 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 = gdev->ddr_paddr;
    > + p->mem[2].size = extram_pool_sz;
    > + p->mem[2].memtype = UIO_MEM_PHYS;
    > +
    > + p->name = kasprintf(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->dev, p);
    > + if (ret < 0)
    > + goto out_free;
    > + }
    > +
    > + platform_set_drvdata(dev, gdev);
    > + return 0;
    > +
    > +out_free:
    > + pruss_cleanup(dev, gdev);
    > + return ret;
    > +}
    > +
    > +static int __devexit pruss_remove(struct platform_device *dev)
    > +{
    > + struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
    > +
    > + pruss_cleanup(dev, gdev);
    > + platform_set_drvdata(dev, NULL);
    > + return 0;
    > +}
    > +
    > +static struct platform_driver pruss_driver = {
    > + .probe = pruss_probe,
    > + .remove = __devexit_p(pruss_remove),
    > + .driver = {
    > + .name = DRV_NAME,
    > + .owner = THIS_MODULE,
    > + },
    > +};
    > +
    > +static int __init pruss_init_module(void)
    > +{
    > + return platform_driver_register(&pruss_driver);
    > +}
    > +
    > +module_init(pruss_init_module);
    > +
    > +static void __exit pruss_exit_module(void)
    > +{
    > + platform_driver_unregister(&pruss_driver);
    > +}
    > +
    > +module_exit(pruss_exit_module);
    > +
    > +MODULE_LICENSE("GPL v2");
    > +MODULE_VERSION(DRV_VERSION);
    > +MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
    > +MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");
    > diff --git a/include/linux/platform_data/uio_pruss.h b/include/linux/platform_data/uio_pruss.h
    > new file mode 100644
    > index 0000000..f39140a
    > --- /dev/null
    > +++ b/include/linux/platform_data/uio_pruss.h
    > @@ -0,0 +1,25 @@
    > +/*
    > + * include/linux/platform_data/uio_pruss.h
    > + *
    > + * Platform data for uio_pruss driver
    > + *
    > + * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
    > + *
    > + * This program is free software; you can redistribute it and/or
    > + * modify it under the terms of the GNU General Public License as
    > + * published by the Free Software Foundation version 2.
    > + *
    > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
    > + * kind, whether express or implied; without even the implied warranty
    > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + */
    > +
    > +#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;
    > +};
    > +#endif /* _UIO_PRUSS_H_ */
    > --
    > 1.6.0.6
    >
    >


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