[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/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_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 {
		clk_enable(gdev->pruss_clk);
	}

	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>
	27	#include <linux/slab.h>
2eb2478d	28	#include <linux/genalloc.h>
f1a304e7 PG	29
	30	#define DRV_NAME "pruss_uio"
	31	#define DRV_VERSION "1.0"
	32
	33	static int sram_pool_sz = SZ_16K;
	34	module_param(sram_pool_sz, int, 0);
	35	MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
	36
	37	static int extram_pool_sz = SZ_256K;
	38	module_param(extram_pool_sz, int, 0);
	39	MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
	40
	41	/*
25985edc	42	* Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
f1a304e7 PG	43	* events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
	44	* firmware and user space application, async notification from PRU firmware
	45	* to user space application
	46	* 3 PRU_EVTOUT0
	47	* 4 PRU_EVTOUT1
	48	* 5 PRU_EVTOUT2
	49	* 6 PRU_EVTOUT3
	50	* 7 PRU_EVTOUT4
	51	* 8 PRU_EVTOUT5
	52	* 9 PRU_EVTOUT6
	53	* 10 PRU_EVTOUT7
	54	*/
	55	#define MAX_PRUSS_EVT 8
	56
	57	#define PINTC_HIDISR 0x0038
	58	#define PINTC_HIPIR 0x0900
	59	#define HIPIR_NOPEND 0x80000000
	60	#define PINTC_HIER 0x1500
	61
	62	struct uio_pruss_dev {
	63	struct uio_info *info;
	64	struct clk *pruss_clk;
	65	dma_addr_t sram_paddr;
	66	dma_addr_t ddr_paddr;
	67	void __iomem *prussio_vaddr;
2eb2478d	68	unsigned long sram_vaddr;
f1a304e7 PG	69	void *ddr_vaddr;
	70	unsigned int hostirq_start;
	71	unsigned int pintc_base;
2eb2478d	72	struct gen_pool *sram_pool;
f1a304e7 PG	73	};
	74
	75	static irqreturn_t pruss_handler(int irq, struct uio_info *info)
	76	{
	77	struct uio_pruss_dev *gdev = info->priv;
	78	int intr_bit = (irq - gdev->hostirq_start + 2);
	79	int val, intr_mask = (1 << intr_bit);
	80	void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
	81	void __iomem *intren_reg = base + PINTC_HIER;
	82	void __iomem *intrdis_reg = base + PINTC_HIDISR;
	83	void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
	84
	85	val = ioread32(intren_reg);
	86	/* Is interrupt enabled and active ? */
	87	if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
	88	return IRQ_NONE;
	89	/* Disable interrupt */
	90	iowrite32(intr_bit, intrdis_reg);
	91	return IRQ_HANDLED;
	92	}
	93
4719ebfd	94	static void pruss_cleanup(struct device dev, struct uio_pruss_dev gdev)
f1a304e7 PG	95	{
	96	int cnt;
	97	struct uio_info *p = gdev->info;
	98
	99	for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
	100	uio_unregister_device(p);
	101	kfree(p->name);
	102	}
	103	iounmap(gdev->prussio_vaddr);
	104	if (gdev->ddr_vaddr) {
4719ebfd	105	dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
f1a304e7 PG	106	gdev->ddr_paddr);
	107	}
	108	if (gdev->sram_vaddr)
2eb2478d MP	109	gen_pool_free(gdev->sram_pool,
	110	gdev->sram_vaddr,
	111	sram_pool_sz);
f1a304e7 PG	112	kfree(gdev->info);
	113	clk_put(gdev->pruss_clk);
	114	kfree(gdev);
	115	}
	116
4719ebfd	117	static int pruss_probe(struct platform_device *pdev)
f1a304e7 PG	118	{
	119	struct uio_info *p;
	120	struct uio_pruss_dev *gdev;
	121	struct resource *regs_prussio;
4719ebfd	122	struct device *dev = &pdev->dev;
f1a304e7	123	int ret = -ENODEV, cnt = 0, len;
4719ebfd	124	struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
f1a304e7 PG	125
	126	gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
	127	if (!gdev)
	128	return -ENOMEM;
	129
	130	gdev->info = kzalloc(sizeof(p) MAX_PRUSS_EVT, GFP_KERNEL);
	131	if (!gdev->info) {
	132	kfree(gdev);
	133	return -ENOMEM;
	134	}
4719ebfd	135
f1a304e7	136	/* Power on PRU in case its not done as part of boot-loader */
4719ebfd	137	gdev->pruss_clk = clk_get(dev, "pruss");
f1a304e7	138	if (IS_ERR(gdev->pruss_clk)) {
4719ebfd	139	dev_err(dev, "Failed to get clock\n");
cb3771b0	140	ret = PTR_ERR(gdev->pruss_clk);
f1a304e7 PG	141	kfree(gdev->info);
f1a304e7 PG	142	kfree(gdev);
f1a304e7 PG	143	return ret;
	144	} else {
	145	clk_enable(gdev->pruss_clk);
	146	}
	147
4719ebfd	148	regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
f1a304e7	149	if (!regs_prussio) {
4719ebfd	150	dev_err(dev, "No PRUSS I/O resource specified\n");
f1a304e7 PG	151	goto out_free;
	152	}
	153
	154	if (!regs_prussio->start) {
4719ebfd	155	dev_err(dev, "Invalid memory resource\n");
f1a304e7 PG	156	goto out_free;
	157	}
	158
2eb2478d MP	159	if (pdata->sram_pool) {
	160	gdev->sram_pool = pdata->sram_pool;
	161	gdev->sram_vaddr =
288342e9 NC	162	(unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
288342e9 NC	163	sram_pool_sz, &gdev->sram_paddr);
2eb2478d	164	if (!gdev->sram_vaddr) {
4719ebfd	165	dev_err(dev, "Could not allocate SRAM pool\n");
2eb2478d MP	166	goto out_free;
2eb2478d MP	167	}
f1a304e7 PG	168	}
f1a304e7 PG	169
4719ebfd	170	gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
f1a304e7 PG	171	&(gdev->ddr_paddr), GFP_KERNEL \| GFP_DMA);
f1a304e7 PG	172	if (!gdev->ddr_vaddr) {
4719ebfd	173	dev_err(dev, "Could not allocate external memory\n");
f1a304e7 PG	174	goto out_free;
	175	}
	176
	177	len = resource_size(regs_prussio);
	178	gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
	179	if (!gdev->prussio_vaddr) {
4719ebfd	180	dev_err(dev, "Can't remap PRUSS I/O address range\n");
f1a304e7 PG	181	goto out_free;
	182	}
	183
	184	gdev->pintc_base = pdata->pintc_base;
4719ebfd	185	gdev->hostirq_start = platform_get_irq(pdev, 0);
f1a304e7 PG	186
	187	for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
	188	p->mem[0].addr = regs_prussio->start;
	189	p->mem[0].size = resource_size(regs_prussio);
	190	p->mem[0].memtype = UIO_MEM_PHYS;
	191
	192	p->mem[1].addr = gdev->sram_paddr;
	193	p->mem[1].size = sram_pool_sz;
	194	p->mem[1].memtype = UIO_MEM_PHYS;
	195
	196	p->mem[2].addr = gdev->ddr_paddr;
	197	p->mem[2].size = extram_pool_sz;
	198	p->mem[2].memtype = UIO_MEM_PHYS;
	199
	200	p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);
	201	p->version = DRV_VERSION;
	202
	203	/* Register PRUSS IRQ lines */
	204	p->irq = gdev->hostirq_start + cnt;
	205	p->handler = pruss_handler;
	206	p->priv = gdev;
	207
4719ebfd	208	ret = uio_register_device(dev, p);
f1a304e7 PG	209	if (ret < 0)
	210	goto out_free;
	211	}
	212
4719ebfd	213	platform_set_drvdata(pdev, gdev);
f1a304e7 PG	214	return 0;
	215
	216	out_free:
	217	pruss_cleanup(dev, gdev);
	218	return ret;
	219	}
	220
9b96c312	221	static int pruss_remove(struct platform_device *dev)
f1a304e7 PG	222	{
	223	struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
	224
4719ebfd	225	pruss_cleanup(&dev->dev, gdev);
f1a304e7 PG	226	return 0;
	227	}
	228
	229	static struct platform_driver pruss_driver = {
	230	.probe = pruss_probe,
5a59509b	231	.remove = pruss_remove,
f1a304e7 PG	232	.driver = {
f1a304e7 PG	233	.name = DRV_NAME,
f1a304e7 PG	234	},
	235	};
	236
11e3123d	237	module_platform_driver(pruss_driver);
f1a304e7 PG	238
	239	MODULE_LICENSE("GPL v2");
	240	MODULE_VERSION(DRV_VERSION);
	241	MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
	242	MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");