+++ /dev/null
-// 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>");
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