4 files changed, 290 insertions, 0 deletions

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index bb440792a1b7..6f3ea9bbc818 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 18fd818c5b97..d4dd9a5552f8 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 000000000000..daf6e77de2b1
--- /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 000000000000..f39140aabc6f
--- /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_ */