[linux-2.6-block.git] / drivers / scsi / jazz_esp.c

// SPDX-License-Identifier: GPL-2.0-only
/* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
 *
 * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
 */

#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>

#include <asm/irq.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <asm/jazz.h>
#include <asm/jazzdma.h>

#include <scsi/scsi_host.h>

#include "esp_scsi.h"

#define DRV_MODULE_NAME		"jazz_esp"
#define PFX DRV_MODULE_NAME	": "
#define DRV_VERSION		"1.000"
#define DRV_MODULE_RELDATE	"May 19, 2007"

static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
{
	*(volatile u8 *)(esp->regs + reg) = val;
}

static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
{
	return *(volatile u8 *)(esp->regs + reg);
}

static int jazz_esp_irq_pending(struct esp *esp)
{
	if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
		return 1;
	return 0;
}

static void jazz_esp_reset_dma(struct esp *esp)
{
	vdma_disable ((int)esp->dma_regs);
}

static void jazz_esp_dma_drain(struct esp *esp)
{
	/* nothing to do */
}

static void jazz_esp_dma_invalidate(struct esp *esp)
{
	vdma_disable ((int)esp->dma_regs);
}

static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
				  u32 dma_count, int write, u8 cmd)
{
	BUG_ON(!(cmd & ESP_CMD_DMA));

	jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
	jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
	vdma_disable ((int)esp->dma_regs);
	if (write)
		vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
	else
		vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);

	vdma_set_addr ((int)esp->dma_regs, addr);
	vdma_set_count ((int)esp->dma_regs, dma_count);
	vdma_enable ((int)esp->dma_regs);

	scsi_esp_cmd(esp, cmd);
}

static int jazz_esp_dma_error(struct esp *esp)
{
	u32 enable = vdma_get_enable((int)esp->dma_regs);

	if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
		return 1;

	return 0;
}

static const struct esp_driver_ops jazz_esp_ops = {
	.esp_write8	=	jazz_esp_write8,
	.esp_read8	=	jazz_esp_read8,
	.irq_pending	=	jazz_esp_irq_pending,
	.reset_dma	=	jazz_esp_reset_dma,
	.dma_drain	=	jazz_esp_dma_drain,
	.dma_invalidate	=	jazz_esp_dma_invalidate,
	.send_dma_cmd	=	jazz_esp_send_dma_cmd,
	.dma_error	=	jazz_esp_dma_error,
};

static int esp_jazz_probe(struct platform_device *dev)
{
	struct scsi_host_template *tpnt = &scsi_esp_template;
	struct Scsi_Host *host;
	struct esp *esp;
	struct resource *res;
	int err;

	host = scsi_host_alloc(tpnt, sizeof(struct esp));

	err = -ENOMEM;
	if (!host)
		goto fail;

	host->max_id = 8;
	esp = shost_priv(host);

	esp->host = host;
	esp->dev = &dev->dev;
	esp->ops = &jazz_esp_ops;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res)
		goto fail_unlink;

	esp->regs = (void __iomem *)res->start;
	if (!esp->regs)
		goto fail_unlink;

	res = platform_get_resource(dev, IORESOURCE_MEM, 1);
	if (!res)
		goto fail_unlink;

	esp->dma_regs = (void __iomem *)res->start;

	esp->command_block = dma_alloc_coherent(esp->dev, 16,
						&esp->command_block_dma,
						GFP_KERNEL);
	if (!esp->command_block)
		goto fail_unmap_regs;

	host->irq = platform_get_irq(dev, 0);
	err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
	if (err < 0)
		goto fail_unmap_command_block;

	esp->scsi_id = 7;
	esp->host->this_id = esp->scsi_id;
	esp->scsi_id_mask = (1 << esp->scsi_id);
	esp->cfreq = 40000000;

	dev_set_drvdata(&dev->dev, esp);

	err = scsi_esp_register(esp);
	if (err)
		goto fail_free_irq;

	return 0;

fail_free_irq:
	free_irq(host->irq, esp);
fail_unmap_command_block:
	dma_free_coherent(esp->dev, 16,
			  esp->command_block,
			  esp->command_block_dma);
fail_unmap_regs:
fail_unlink:
	scsi_host_put(host);
fail:
	return err;
}

static int esp_jazz_remove(struct platform_device *dev)
{
	struct esp *esp = dev_get_drvdata(&dev->dev);
	unsigned int irq = esp->host->irq;

	scsi_esp_unregister(esp);

	free_irq(irq, esp);
	dma_free_coherent(esp->dev, 16,
			  esp->command_block,
			  esp->command_block_dma);

	scsi_host_put(esp->host);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:jazz_esp");

static struct platform_driver esp_jazz_driver = {
	.probe		= esp_jazz_probe,
	.remove		= esp_jazz_remove,
	.driver	= {
		.name	= "jazz_esp",
	},
};

static int __init jazz_esp_init(void)
{
	return platform_driver_register(&esp_jazz_driver);
}

static void __exit jazz_esp_exit(void)
{
	platform_driver_unregister(&esp_jazz_driver);
}

MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(jazz_esp_init);
module_exit(jazz_esp_exit);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
352e921f	2	/* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
1da177e4	3	*
d36b6910	4	* Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
1da177e4 LT	5	*/
1da177e4 LT	6
1da177e4	7	#include <linux/kernel.h>
5a0e3ad6	8	#include <linux/gfp.h>
1da177e4	9	#include <linux/types.h>
352e921f TB	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/dma-mapping.h>
1da177e4 LT	15
1da177e4 LT	16	#include <asm/irq.h>
352e921f TB	17	#include <asm/io.h>
	18	#include <asm/dma.h>
	19
1da177e4 LT	20	#include <asm/jazz.h>
1da177e4 LT	21	#include <asm/jazzdma.h>
1da177e4	22
352e921f	23	#include <scsi/scsi_host.h>
1da177e4	24
352e921f	25	#include "esp_scsi.h"
1da177e4	26
352e921f TB	27	#define DRV_MODULE_NAME "jazz_esp"
	28	#define PFX DRV_MODULE_NAME ": "
	29	#define DRV_VERSION "1.000"
	30	#define DRV_MODULE_RELDATE "May 19, 2007"
1da177e4	31
352e921f	32	static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
1da177e4	33	{
352e921f	34	(volatile u8 )(esp->regs + reg) = val;
1da177e4 LT	35	}
1da177e4 LT	36
352e921f	37	static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
1da177e4	38	{
352e921f	39	return (volatile u8 )(esp->regs + reg);
1da177e4 LT	40	}
1da177e4 LT	41
352e921f	42	static int jazz_esp_irq_pending(struct esp *esp)
1da177e4	43	{
352e921f TB	44	if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
	45	return 1;
	46	return 0;
1da177e4 LT	47	}
1da177e4 LT	48
352e921f	49	static void jazz_esp_reset_dma(struct esp *esp)
1da177e4	50	{
352e921f	51	vdma_disable ((int)esp->dma_regs);
1da177e4 LT	52	}
1da177e4 LT	53
352e921f	54	static void jazz_esp_dma_drain(struct esp *esp)
1da177e4	55	{
352e921f	56	/* nothing to do */
1da177e4 LT	57	}
1da177e4 LT	58
352e921f	59	static void jazz_esp_dma_invalidate(struct esp *esp)
1da177e4	60	{
352e921f	61	vdma_disable ((int)esp->dma_regs);
1da177e4 LT	62	}
1da177e4 LT	63
352e921f TB	64	static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
352e921f TB	65	u32 dma_count, int write, u8 cmd)
1da177e4	66	{
352e921f TB	67	BUG_ON(!(cmd & ESP_CMD_DMA));
	68
	69	jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
	70	jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
	71	vdma_disable ((int)esp->dma_regs);
	72	if (write)
	73	vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
	74	else
	75	vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
	76
	77	vdma_set_addr ((int)esp->dma_regs, addr);
	78	vdma_set_count ((int)esp->dma_regs, dma_count);
	79	vdma_enable ((int)esp->dma_regs);
	80
	81	scsi_esp_cmd(esp, cmd);
1da177e4 LT	82	}
1da177e4 LT	83
352e921f	84	static int jazz_esp_dma_error(struct esp *esp)
1da177e4	85	{
352e921f TB	86	u32 enable = vdma_get_enable((int)esp->dma_regs);
	87
	88	if (enable & (R4030_MEM_INTR\|R4030_ADDR_INTR))
	89	return 1;
	90
	91	return 0;
1da177e4 LT	92	}
1da177e4 LT	93
352e921f TB	94	static const struct esp_driver_ops jazz_esp_ops = {
	95	.esp_write8 = jazz_esp_write8,
	96	.esp_read8 = jazz_esp_read8,
352e921f TB	97	.irq_pending = jazz_esp_irq_pending,
	98	.reset_dma = jazz_esp_reset_dma,
	99	.dma_drain = jazz_esp_dma_drain,
	100	.dma_invalidate = jazz_esp_dma_invalidate,
	101	.send_dma_cmd = jazz_esp_send_dma_cmd,
	102	.dma_error = jazz_esp_dma_error,
	103	};
	104
6f039790	105	static int esp_jazz_probe(struct platform_device *dev)
1da177e4	106	{
352e921f TB	107	struct scsi_host_template *tpnt = &scsi_esp_template;
	108	struct Scsi_Host *host;
	109	struct esp *esp;
	110	struct resource *res;
	111	int err;
	112
	113	host = scsi_host_alloc(tpnt, sizeof(struct esp));
	114
	115	err = -ENOMEM;
	116	if (!host)
	117	goto fail;
	118
	119	host->max_id = 8;
2b14ec78	120	esp = shost_priv(host);
352e921f TB	121
352e921f TB	122	esp->host = host;
e32ec657	123	esp->dev = &dev->dev;
352e921f TB	124	esp->ops = &jazz_esp_ops;
	125
	126	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	127	if (!res)
	128	goto fail_unlink;
	129
	130	esp->regs = (void __iomem *)res->start;
	131	if (!esp->regs)
	132	goto fail_unlink;
	133
	134	res = platform_get_resource(dev, IORESOURCE_MEM, 1);
	135	if (!res)
	136	goto fail_unlink;
	137
	138	esp->dma_regs = (void __iomem *)res->start;
	139
	140	esp->command_block = dma_alloc_coherent(esp->dev, 16,
	141	&esp->command_block_dma,
	142	GFP_KERNEL);
	143	if (!esp->command_block)
	144	goto fail_unmap_regs;
	145
	146	host->irq = platform_get_irq(dev, 0);
	147	err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
	148	if (err < 0)
	149	goto fail_unmap_command_block;
	150
	151	esp->scsi_id = 7;
	152	esp->host->this_id = esp->scsi_id;
	153	esp->scsi_id_mask = (1 << esp->scsi_id);
	154	esp->cfreq = 40000000;
	155
	156	dev_set_drvdata(&dev->dev, esp);
	157
44b1b4d2	158	err = scsi_esp_register(esp);
352e921f TB	159	if (err)
	160	goto fail_free_irq;
	161
	162	return 0;
	163
	164	fail_free_irq:
	165	free_irq(host->irq, esp);
	166	fail_unmap_command_block:
	167	dma_free_coherent(esp->dev, 16,
	168	esp->command_block,
	169	esp->command_block_dma);
	170	fail_unmap_regs:
	171	fail_unlink:
	172	scsi_host_put(host);
	173	fail:
	174	return err;
1da177e4 LT	175	}
1da177e4 LT	176
6f039790	177	static int esp_jazz_remove(struct platform_device *dev)
1da177e4	178	{
352e921f TB	179	struct esp *esp = dev_get_drvdata(&dev->dev);
	180	unsigned int irq = esp->host->irq;
	181
	182	scsi_esp_unregister(esp);
	183
	184	free_irq(irq, esp);
	185	dma_free_coherent(esp->dev, 16,
	186	esp->command_block,
	187	esp->command_block_dma);
	188
	189	scsi_host_put(esp->host);
	190
	191	return 0;
1da177e4 LT	192	}
1da177e4 LT	193
ecc1241e KS	194	/* work with hotplug and coldplug */
	195	MODULE_ALIAS("platform:jazz_esp");
	196
352e921f TB	197	static struct platform_driver esp_jazz_driver = {
352e921f TB	198	.probe = esp_jazz_probe,
6f039790	199	.remove = esp_jazz_remove,
352e921f TB	200	.driver = {
	201	.name = "jazz_esp",
	202	},
	203	};
1da177e4	204
352e921f	205	static int __init jazz_esp_init(void)
1da177e4	206	{
352e921f	207	return platform_driver_register(&esp_jazz_driver);
1da177e4 LT	208	}
1da177e4 LT	209
352e921f TB	210	static void __exit jazz_esp_exit(void)
	211	{
	212	platform_driver_unregister(&esp_jazz_driver);
1da177e4 LT	213	}
1da177e4 LT	214
352e921f TB	215	MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
	216	MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
	217	MODULE_LICENSE("GPL");
	218	MODULE_VERSION(DRV_VERSION);
	219
	220	module_init(jazz_esp_init);
	221	module_exit(jazz_esp_exit);