From mboxrd@z Thu Jan 1 00:00:00 1970 From: hjk@hansjkoch.de (Hans J. Koch) Date: Sat, 5 Mar 2011 01:30:04 +0100 Subject: [PATCH v11 1/1] PRUSS UIO driver support In-Reply-To: <1299279617-21108-2-git-send-email-pratheesh@ti.com> References: <1299279617-21108-1-git-send-email-pratheesh@ti.com> <1299279617-21108-2-git-send-email-pratheesh@ti.com> Message-ID: <20110305003004.GA1295@local> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > Reviewed-by: Thomas Gleixner > Reviewed-by: Arnd Bergmann Signed-off-by: Hans J. Koch 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 > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#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 "); > +MODULE_AUTHOR("Pratheesh Gangadhar "); > 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 > >