[linux-2.6-block.git] / drivers / uio / uio_mf624.c

/*
 * UIO driver fo Humusoft MF624 DAQ card.
 * Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
 *                    Czech Technical University in Prague
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/uio_driver.h>

#define PCI_VENDOR_ID_HUMUSOFT		0x186c
#define PCI_DEVICE_ID_MF624		0x0624
#define PCI_SUBVENDOR_ID_HUMUSOFT	0x186c
#define PCI_SUBDEVICE_DEVICE		0x0624

/* BAR0 Interrupt control/status register */
#define INTCSR				0x4C
#define INTCSR_ADINT_ENABLE		(1 << 0)
#define INTCSR_CTR4INT_ENABLE		(1 << 3)
#define INTCSR_PCIINT_ENABLE		(1 << 6)
#define INTCSR_ADINT_STATUS		(1 << 2)
#define INTCSR_CTR4INT_STATUS		(1 << 5)

enum mf624_interrupt_source {ADC, CTR4, ALL};

static void mf624_disable_interrupt(enum mf624_interrupt_source source,
			     struct uio_info *info)
{
	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;

	switch (source) {
	case ADC:
		iowrite32(ioread32(INTCSR_reg)
			& ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
			INTCSR_reg);
		break;

	case CTR4:
		iowrite32(ioread32(INTCSR_reg)
			& ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
			INTCSR_reg);
		break;

	case ALL:
	default:
		iowrite32(ioread32(INTCSR_reg)
			& ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
			    | INTCSR_PCIINT_ENABLE),
			INTCSR_reg);
		break;
	}
}

static void mf624_enable_interrupt(enum mf624_interrupt_source source,
			    struct uio_info *info)
{
	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;

	switch (source) {
	case ADC:
		iowrite32(ioread32(INTCSR_reg)
			| INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
			INTCSR_reg);
		break;

	case CTR4:
		iowrite32(ioread32(INTCSR_reg)
			| INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
			INTCSR_reg);
		break;

	case ALL:
	default:
		iowrite32(ioread32(INTCSR_reg)
			| INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
			| INTCSR_PCIINT_ENABLE,
			INTCSR_reg);
		break;
	}
}

static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
{
	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;

	if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
	    && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
		mf624_disable_interrupt(ADC, info);
		return IRQ_HANDLED;
	}

	if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
	    && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
		mf624_disable_interrupt(CTR4, info);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
{
	if (irq_on == 0)
		mf624_disable_interrupt(ALL, info);
	else if (irq_on == 1)
		mf624_enable_interrupt(ALL, info);

	return 0;
}

static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct uio_info *info;

	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (pci_enable_device(dev))
		goto out_free;

	if (pci_request_regions(dev, "mf624"))
		goto out_disable;

	info->name = "mf624";
	info->version = "0.0.1";

	/* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */

	/* BAR0 */
	info->mem[0].name = "PCI chipset, interrupts, status "
			"bits, special functions";
	info->mem[0].addr = pci_resource_start(dev, 0);
	if (!info->mem[0].addr)
		goto out_release;
	info->mem[0].size = pci_resource_len(dev, 0);
	info->mem[0].memtype = UIO_MEM_PHYS;
	info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
	if (!info->mem[0].internal_addr)
		goto out_release;

	/* BAR2 */
	info->mem[1].name = "ADC, DAC, DIO";
	info->mem[1].addr = pci_resource_start(dev, 2);
	if (!info->mem[1].addr)
		goto out_unmap0;
	info->mem[1].size = pci_resource_len(dev, 2);
	info->mem[1].memtype = UIO_MEM_PHYS;
	info->mem[1].internal_addr = pci_ioremap_bar(dev, 2);
	if (!info->mem[1].internal_addr)
		goto out_unmap0;

	/* BAR4 */
	info->mem[2].name = "Counter/timer chip";
	info->mem[2].addr = pci_resource_start(dev, 4);
	if (!info->mem[2].addr)
		goto out_unmap1;
	info->mem[2].size = pci_resource_len(dev, 4);
	info->mem[2].memtype = UIO_MEM_PHYS;
	info->mem[2].internal_addr = pci_ioremap_bar(dev, 4);
	if (!info->mem[2].internal_addr)
		goto out_unmap1;

	info->irq = dev->irq;
	info->irq_flags = IRQF_SHARED;
	info->handler = mf624_irq_handler;

	info->irqcontrol = mf624_irqcontrol;

	if (uio_register_device(&dev->dev, info))
		goto out_unmap2;

	pci_set_drvdata(dev, info);

	return 0;

out_unmap2:
	iounmap(info->mem[2].internal_addr);
out_unmap1:
	iounmap(info->mem[1].internal_addr);
out_unmap0:
	iounmap(info->mem[0].internal_addr);

out_release:
	pci_release_regions(dev);

out_disable:
	pci_disable_device(dev);

out_free:
	kfree(info);
	return -ENODEV;
}

static void mf624_pci_remove(struct pci_dev *dev)
{
	struct uio_info *info = pci_get_drvdata(dev);

	mf624_disable_interrupt(ALL, info);

	uio_unregister_device(info);
	pci_release_regions(dev);
	pci_disable_device(dev);

	iounmap(info->mem[0].internal_addr);
	iounmap(info->mem[1].internal_addr);
	iounmap(info->mem[2].internal_addr);

	kfree(info);
}

static const struct pci_device_id mf624_pci_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
	{ 0, }
};

static struct pci_driver mf624_pci_driver = {
	.name = "mf624",
	.id_table = mf624_pci_id,
	.probe = mf624_pci_probe,
	.remove = mf624_pci_remove,
};
MODULE_DEVICE_TABLE(pci, mf624_pci_id);

module_pci_driver(mf624_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");
Commit	Line	Data
06849faa RL	1	/*
	2	* UIO driver fo Humusoft MF624 DAQ card.
	3	* Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
	4	* Czech Technical University in Prague
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/device.h>
	24	#include <linux/pci.h>
	25	#include <linux/slab.h>
	26	#include <linux/io.h>
	27	#include <linux/kernel.h>
	28	#include <linux/uio_driver.h>
	29
	30	#define PCI_VENDOR_ID_HUMUSOFT 0x186c
	31	#define PCI_DEVICE_ID_MF624 0x0624
	32	#define PCI_SUBVENDOR_ID_HUMUSOFT 0x186c
	33	#define PCI_SUBDEVICE_DEVICE 0x0624
	34
	35	/* BAR0 Interrupt control/status register */
	36	#define INTCSR 0x4C
	37	#define INTCSR_ADINT_ENABLE (1 << 0)
	38	#define INTCSR_CTR4INT_ENABLE (1 << 3)
	39	#define INTCSR_PCIINT_ENABLE (1 << 6)
	40	#define INTCSR_ADINT_STATUS (1 << 2)
	41	#define INTCSR_CTR4INT_STATUS (1 << 5)
	42
	43	enum mf624_interrupt_source {ADC, CTR4, ALL};
	44
497b46db	45	static void mf624_disable_interrupt(enum mf624_interrupt_source source,
06849faa RL	46	struct uio_info *info)
	47	{
	48	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
	49
	50	switch (source) {
	51	case ADC:
	52	iowrite32(ioread32(INTCSR_reg)
	53	& ~(INTCSR_ADINT_ENABLE \| INTCSR_PCIINT_ENABLE),
	54	INTCSR_reg);
	55	break;
	56
	57	case CTR4:
	58	iowrite32(ioread32(INTCSR_reg)
	59	& ~(INTCSR_CTR4INT_ENABLE \| INTCSR_PCIINT_ENABLE),
	60	INTCSR_reg);
	61	break;
	62
	63	case ALL:
	64	default:
	65	iowrite32(ioread32(INTCSR_reg)
	66	& ~(INTCSR_ADINT_ENABLE \| INTCSR_CTR4INT_ENABLE
	67	\| INTCSR_PCIINT_ENABLE),
	68	INTCSR_reg);
	69	break;
	70	}
	71	}
	72
497b46db	73	static void mf624_enable_interrupt(enum mf624_interrupt_source source,
06849faa RL	74	struct uio_info *info)
	75	{
	76	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
	77
	78	switch (source) {
	79	case ADC:
	80	iowrite32(ioread32(INTCSR_reg)
	81	\| INTCSR_ADINT_ENABLE \| INTCSR_PCIINT_ENABLE,
	82	INTCSR_reg);
	83	break;
	84
	85	case CTR4:
	86	iowrite32(ioread32(INTCSR_reg)
	87	\| INTCSR_CTR4INT_ENABLE \| INTCSR_PCIINT_ENABLE,
	88	INTCSR_reg);
	89	break;
	90
	91	case ALL:
	92	default:
	93	iowrite32(ioread32(INTCSR_reg)
	94	\| INTCSR_ADINT_ENABLE \| INTCSR_CTR4INT_ENABLE
	95	\| INTCSR_PCIINT_ENABLE,
	96	INTCSR_reg);
	97	break;
	98	}
	99	}
	100
	101	static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
	102	{
	103	void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
	104
	105	if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
	106	&& (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
	107	mf624_disable_interrupt(ADC, info);
	108	return IRQ_HANDLED;
	109	}
	110
	111	if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
	112	&& (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
	113	mf624_disable_interrupt(CTR4, info);
	114	return IRQ_HANDLED;
	115	}
	116
	117	return IRQ_NONE;
	118	}
	119
	120	static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
	121	{
	122	if (irq_on == 0)
	123	mf624_disable_interrupt(ALL, info);
	124	else if (irq_on == 1)
	125	mf624_enable_interrupt(ALL, info);
	126
	127	return 0;
	128	}
	129
	130	static int mf624_pci_probe(struct pci_dev dev, const struct pci_device_id id)
	131	{
	132	struct uio_info *info;
	133
	134	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
	135	if (!info)
	136	return -ENOMEM;
	137
138	if (pci_enable_device(dev))
139	goto out_free;
140
141	if (pci_request_regions(dev, "mf624"))
142	goto out_disable;
143
144	info->name = "mf624";
145	info->version = "0.0.1";
146
147	/* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
148
149	/* BAR0 */
150	info->mem[0].name = "PCI chipset, interrupts, status "
151	"bits, special functions";
152	info->mem[0].addr = pci_resource_start(dev, 0);
153	if (!info->mem[0].addr)
154	goto out_release;
155	info->mem[0].size = pci_resource_len(dev, 0);
156	info->mem[0].memtype = UIO_MEM_PHYS;
157	info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
158	if (!info->mem[0].internal_addr)
159	goto out_release;
160
161	/* BAR2 */
162	info->mem[1].name = "ADC, DAC, DIO";
163	info->mem[1].addr = pci_resource_start(dev, 2);
164	if (!info->mem[1].addr)
165	goto out_unmap0;
166	info->mem[1].size = pci_resource_len(dev, 2);
167	info->mem[1].memtype = UIO_MEM_PHYS;
168	info->mem[1].internal_addr = pci_ioremap_bar(dev, 2);
169	if (!info->mem[1].internal_addr)
170	goto out_unmap0;
171
172	/* BAR4 */
173	info->mem[2].name = "Counter/timer chip";
174	info->mem[2].addr = pci_resource_start(dev, 4);
175	if (!info->mem[2].addr)
176	goto out_unmap1;
177	info->mem[2].size = pci_resource_len(dev, 4);
178	info->mem[2].memtype = UIO_MEM_PHYS;
179	info->mem[2].internal_addr = pci_ioremap_bar(dev, 4);
180	if (!info->mem[2].internal_addr)
181	goto out_unmap1;
182
183	info->irq = dev->irq;
184	info->irq_flags = IRQF_SHARED;
185	info->handler = mf624_irq_handler;
186
187	info->irqcontrol = mf624_irqcontrol;
188
189	if (uio_register_device(&dev->dev, info))
190	goto out_unmap2;
191
192	pci_set_drvdata(dev, info);
193
194	return 0;
195
196	out_unmap2:
197	iounmap(info->mem[2].internal_addr);
198	out_unmap1:
199	iounmap(info->mem[1].internal_addr);
200	out_unmap0:
201	iounmap(info->mem[0].internal_addr);
202
203	out_release:
204	pci_release_regions(dev);
205
206	out_disable:
207	pci_disable_device(dev);
208
209	out_free:
210	kfree(info);
211	return -ENODEV;
212	}
213
214	static void mf624_pci_remove(struct pci_dev *dev)
215	{
216	struct uio_info *info = pci_get_drvdata(dev);
217
218	mf624_disable_interrupt(ALL, info);
219
220	uio_unregister_device(info);
221	pci_release_regions(dev);
222	pci_disable_device(dev);
06849faa RL	223
	224	iounmap(info->mem[0].internal_addr);
	225	iounmap(info->mem[1].internal_addr);
	226	iounmap(info->mem[2].internal_addr);
	227
	228	kfree(info);
	229	}
	230
0f4054df	231	static const struct pci_device_id mf624_pci_id[] = {
06849faa RL	232	{ PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
	233	{ 0, }
	234	};
	235
	236	static struct pci_driver mf624_pci_driver = {
	237	.name = "mf624",
	238	.id_table = mf624_pci_id,
	239	.probe = mf624_pci_probe,
	240	.remove = mf624_pci_remove,
	241	};
	242	MODULE_DEVICE_TABLE(pci, mf624_pci_id);
	243
	244	module_pci_driver(mf624_pci_driver);
	245	MODULE_LICENSE("GPL v2");
	246	MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");