[mirror_ubuntu-artful-kernel.git] / drivers / uio / uio_pruss.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/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);
		kfree(p->name);
	}
	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);
	kfree(gdev->info);
	clk_disable(gdev->pruss_clk);
	clk_put(gdev->pruss_clk);
	kfree(gdev);
}

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 = -ENODEV, cnt = 0, len;
	struct uio_pruss_pdata *pdata = dev_get_platdata(dev);

	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, "pruss");
	if (IS_ERR(gdev->pruss_clk)) {
		dev_err(dev, "Failed to get clock\n");
		ret = PTR_ERR(gdev->pruss_clk);
		kfree(gdev->info);
		kfree(gdev);
		return ret;
	} else {
		ret = clk_enable(gdev->pruss_clk);
		if (ret) {
			dev_err(dev, "Failed to enable clock\n");
			clk_put(gdev->pruss_clk);
			kfree(gdev->info);
			kfree(gdev);
			return ret;
		}
	}

	regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs_prussio) {
		dev_err(dev, "No PRUSS I/O resource specified\n");
		goto out_free;
	}

	if (!regs_prussio->start) {
		dev_err(dev, "Invalid memory resource\n");
		goto out_free;
	}

	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");
			goto out_free;
		}
	}

	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");
		goto out_free;
	}

	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");
		goto out_free;
	}

	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 = 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, p);
		if (ret < 0)
			goto out_free;
	}

	platform_set_drvdata(pdev, 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->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>");
Commit	Line	Data
f1a304e7 PG	1	/*
	2	* Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
	3	*
	4	* This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM,
	5	* and DDR RAM to user space for applications interacting with PRUSS firmware
	6	*
	7	* Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation version 2.
	12	*
	13	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	14	* kind, whether express or implied; without even the implied warranty
	15	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18	#include <linux/device.h>
	19	#include <linux/module.h>
	20	#include <linux/moduleparam.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/uio_driver.h>
	23	#include <linux/platform_data/uio_pruss.h>
	24	#include <linux/io.h>
	25	#include <linux/clk.h>
	26	#include <linux/dma-mapping.h>
87672676	27	#include <linux/sizes.h>
f1a304e7	28	#include <linux/slab.h>
2eb2478d	29	#include <linux/genalloc.h>
f1a304e7 PG	30
	31	#define DRV_NAME "pruss_uio"
	32	#define DRV_VERSION "1.0"
	33
	34	static int sram_pool_sz = SZ_16K;
	35	module_param(sram_pool_sz, int, 0);
	36	MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
	37
	38	static int extram_pool_sz = SZ_256K;
	39	module_param(extram_pool_sz, int, 0);
	40	MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
	41
	42	/*
25985edc	43	* Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
f1a304e7 PG	44	* events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
	45	* firmware and user space application, async notification from PRU firmware
	46	* to user space application
	47	* 3 PRU_EVTOUT0
	48	* 4 PRU_EVTOUT1
	49	* 5 PRU_EVTOUT2
	50	* 6 PRU_EVTOUT3
	51	* 7 PRU_EVTOUT4
	52	* 8 PRU_EVTOUT5
	53	* 9 PRU_EVTOUT6
	54	* 10 PRU_EVTOUT7
	55	*/
	56	#define MAX_PRUSS_EVT 8
	57
	58	#define PINTC_HIDISR 0x0038
	59	#define PINTC_HIPIR 0x0900
	60	#define HIPIR_NOPEND 0x80000000
	61	#define PINTC_HIER 0x1500
	62
	63	struct uio_pruss_dev {
	64	struct uio_info *info;
	65	struct clk *pruss_clk;
	66	dma_addr_t sram_paddr;
	67	dma_addr_t ddr_paddr;
	68	void __iomem *prussio_vaddr;
2eb2478d	69	unsigned long sram_vaddr;
f1a304e7 PG	70	void *ddr_vaddr;
	71	unsigned int hostirq_start;
	72	unsigned int pintc_base;
2eb2478d	73	struct gen_pool *sram_pool;
f1a304e7 PG	74	};
	75
	76	static irqreturn_t pruss_handler(int irq, struct uio_info *info)
	77	{
	78	struct uio_pruss_dev *gdev = info->priv;
	79	int intr_bit = (irq - gdev->hostirq_start + 2);
	80	int val, intr_mask = (1 << intr_bit);
	81	void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
	82	void __iomem *intren_reg = base + PINTC_HIER;
	83	void __iomem *intrdis_reg = base + PINTC_HIDISR;
	84	void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
	85
	86	val = ioread32(intren_reg);
	87	/* Is interrupt enabled and active ? */
	88	if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
	89	return IRQ_NONE;
	90	/* Disable interrupt */
	91	iowrite32(intr_bit, intrdis_reg);
	92	return IRQ_HANDLED;
	93	}
	94
4719ebfd	95	static void pruss_cleanup(struct device dev, struct uio_pruss_dev gdev)
f1a304e7 PG	96	{
	97	int cnt;
	98	struct uio_info *p = gdev->info;
	99
	100	for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
	101	uio_unregister_device(p);
	102	kfree(p->name);
	103	}
	104	iounmap(gdev->prussio_vaddr);
	105	if (gdev->ddr_vaddr) {
4719ebfd	106	dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
f1a304e7 PG	107	gdev->ddr_paddr);
	108	}
	109	if (gdev->sram_vaddr)
2eb2478d MP	110	gen_pool_free(gdev->sram_pool,
	111	gdev->sram_vaddr,
	112	sram_pool_sz);
f1a304e7	113	kfree(gdev->info);
e663c5db	114	clk_disable(gdev->pruss_clk);
f1a304e7 PG	115	clk_put(gdev->pruss_clk);
	116	kfree(gdev);
	117	}
	118
4719ebfd	119	static int pruss_probe(struct platform_device *pdev)
f1a304e7 PG	120	{
	121	struct uio_info *p;
	122	struct uio_pruss_dev *gdev;
	123	struct resource *regs_prussio;
4719ebfd	124	struct device *dev = &pdev->dev;
f1a304e7	125	int ret = -ENODEV, cnt = 0, len;
4719ebfd	126	struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
f1a304e7 PG	127
	128	gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
	129	if (!gdev)
	130	return -ENOMEM;
	131
	132	gdev->info = kzalloc(sizeof(p) MAX_PRUSS_EVT, GFP_KERNEL);
	133	if (!gdev->info) {
	134	kfree(gdev);
	135	return -ENOMEM;
	136	}
4719ebfd	137
f1a304e7	138	/* Power on PRU in case its not done as part of boot-loader */
4719ebfd	139	gdev->pruss_clk = clk_get(dev, "pruss");
f1a304e7	140	if (IS_ERR(gdev->pruss_clk)) {
4719ebfd	141	dev_err(dev, "Failed to get clock\n");
cb3771b0	142	ret = PTR_ERR(gdev->pruss_clk);
f1a304e7 PG	143	kfree(gdev->info);
f1a304e7 PG	144	kfree(gdev);
f1a304e7 PG	145	return ret;
f1a304e7 PG	146	} else {
e663c5db AK	147	ret = clk_enable(gdev->pruss_clk);
	148	if (ret) {
	149	dev_err(dev, "Failed to enable clock\n");
	150	clk_put(gdev->pruss_clk);
	151	kfree(gdev->info);
	152	kfree(gdev);
	153	return ret;
	154	}
f1a304e7 PG	155	}
f1a304e7 PG	156
4719ebfd	157	regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
f1a304e7	158	if (!regs_prussio) {
4719ebfd	159	dev_err(dev, "No PRUSS I/O resource specified\n");
f1a304e7 PG	160	goto out_free;
	161	}
	162
	163	if (!regs_prussio->start) {
4719ebfd	164	dev_err(dev, "Invalid memory resource\n");
f1a304e7 PG	165	goto out_free;
	166	}
	167
2eb2478d MP	168	if (pdata->sram_pool) {
	169	gdev->sram_pool = pdata->sram_pool;
	170	gdev->sram_vaddr =
288342e9 NC	171	(unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
288342e9 NC	172	sram_pool_sz, &gdev->sram_paddr);
2eb2478d	173	if (!gdev->sram_vaddr) {
4719ebfd	174	dev_err(dev, "Could not allocate SRAM pool\n");
2eb2478d MP	175	goto out_free;
2eb2478d MP	176	}
f1a304e7 PG	177	}
f1a304e7 PG	178
4719ebfd	179	gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
f1a304e7 PG	180	&(gdev->ddr_paddr), GFP_KERNEL \| GFP_DMA);
f1a304e7 PG	181	if (!gdev->ddr_vaddr) {
4719ebfd	182	dev_err(dev, "Could not allocate external memory\n");
f1a304e7 PG	183	goto out_free;
	184	}
	185
	186	len = resource_size(regs_prussio);
	187	gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
	188	if (!gdev->prussio_vaddr) {
4719ebfd	189	dev_err(dev, "Can't remap PRUSS I/O address range\n");
f1a304e7 PG	190	goto out_free;
	191	}
	192
	193	gdev->pintc_base = pdata->pintc_base;
4719ebfd	194	gdev->hostirq_start = platform_get_irq(pdev, 0);
f1a304e7 PG	195
	196	for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
	197	p->mem[0].addr = regs_prussio->start;
	198	p->mem[0].size = resource_size(regs_prussio);
	199	p->mem[0].memtype = UIO_MEM_PHYS;
	200
	201	p->mem[1].addr = gdev->sram_paddr;
	202	p->mem[1].size = sram_pool_sz;
	203	p->mem[1].memtype = UIO_MEM_PHYS;
	204
	205	p->mem[2].addr = gdev->ddr_paddr;
	206	p->mem[2].size = extram_pool_sz;
	207	p->mem[2].memtype = UIO_MEM_PHYS;
	208
	209	p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);
	210	p->version = DRV_VERSION;
	211
	212	/* Register PRUSS IRQ lines */
	213	p->irq = gdev->hostirq_start + cnt;
	214	p->handler = pruss_handler;
	215	p->priv = gdev;
	216
4719ebfd	217	ret = uio_register_device(dev, p);
f1a304e7 PG	218	if (ret < 0)
	219	goto out_free;
	220	}
	221
4719ebfd	222	platform_set_drvdata(pdev, gdev);
f1a304e7 PG	223	return 0;
	224
	225	out_free:
	226	pruss_cleanup(dev, gdev);
	227	return ret;
	228	}
	229
9b96c312	230	static int pruss_remove(struct platform_device *dev)
f1a304e7 PG	231	{
	232	struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
	233
4719ebfd	234	pruss_cleanup(&dev->dev, gdev);
f1a304e7 PG	235	return 0;
	236	}
	237
	238	static struct platform_driver pruss_driver = {
	239	.probe = pruss_probe,
5a59509b	240	.remove = pruss_remove,
f1a304e7 PG	241	.driver = {
f1a304e7 PG	242	.name = DRV_NAME,
f1a304e7 PG	243	},
	244	};
	245
11e3123d	246	module_platform_driver(pruss_driver);
f1a304e7 PG	247
	248	MODULE_LICENSE("GPL v2");
	249	MODULE_VERSION(DRV_VERSION);
	250	MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
	251	MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");