mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
2aec85b26f
Based on the normalized pattern:
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
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference.
Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
249 lines
6.4 KiB
C
249 lines
6.4 KiB
C
// 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;
|
|
}
|
|
|
|
gdev->pintc_base = pdata->pintc_base;
|
|
gdev->hostirq_start = platform_get_irq(pdev, 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 = 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);
|
|
}
|
|
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>");
|