mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Emil Goode](/assets/img/avatar_default.png)
In function pruss_probe we free gdev and try to use it on the next line. I have moved the dereference to above the kfree of gdev. Signed-off-by: Emil Goode <emilgoode@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
245 lines
6.5 KiB
C
245 lines
6.5 KiB
C
/*
|
|
* 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 <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 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)
|
|
gen_pool_free(gdev->sram_pool,
|
|
gdev->sram_vaddr,
|
|
sram_pool_sz);
|
|
kfree(gdev->info);
|
|
clk_put(gdev->pruss_clk);
|
|
kfree(gdev);
|
|
}
|
|
|
|
static int 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");
|
|
ret = PTR_ERR(gdev->pruss_clk);
|
|
kfree(gdev->info);
|
|
kfree(gdev);
|
|
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;
|
|
}
|
|
|
|
if (pdata->sram_pool) {
|
|
gdev->sram_pool = pdata->sram_pool;
|
|
gdev->sram_vaddr =
|
|
gen_pool_alloc(gdev->sram_pool, sram_pool_sz);
|
|
if (!gdev->sram_vaddr) {
|
|
dev_err(&dev->dev, "Could not allocate SRAM pool\n");
|
|
goto out_free;
|
|
}
|
|
gdev->sram_paddr =
|
|
gen_pool_virt_to_phys(gdev->sram_pool,
|
|
gdev->sram_vaddr);
|
|
}
|
|
|
|
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 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 = pruss_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
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>");
|