[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / a3000.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "a3000.h"

#include <linux/stat.h>


#define DMA(ptr)	((a3000_scsiregs *)((ptr)->base))
#define HDATA(ptr)	((struct WD33C93_hostdata *)((ptr)->hostdata))

static struct Scsi_Host *a3000_host = NULL;

static int a3000_release(struct Scsi_Host *instance);

static irqreturn_t a3000_intr(int irq, void *dummy)
{
	unsigned long flags;
	unsigned int status = DMA(a3000_host)->ISTR;

	if (!(status & ISTR_INT_P))
		return IRQ_NONE;
	if (status & ISTR_INTS) {
		spin_lock_irqsave(a3000_host->host_lock, flags);
		wd33c93_intr(a3000_host);
		spin_unlock_irqrestore(a3000_host->host_lock, flags);
		return IRQ_HANDLED;
	}
	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	return IRQ_NONE;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
	unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
	unsigned long addr = virt_to_bus(cmd->SCp.ptr);

	/*
	 * if the physical address has the wrong alignment, or if
	 * physical address is bad, or if it is a write and at the
	 * end of a physical memory chunk, then allocate a bounce
	 * buffer
	 */
	if (addr & A3000_XFER_MASK) {
		HDATA(a3000_host)->dma_bounce_len =
			(cmd->SCp.this_residual + 511) & ~0x1ff;
		HDATA(a3000_host)->dma_bounce_buffer =
			kmalloc(HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);

		/* can't allocate memory; use PIO */
		if (!HDATA(a3000_host)->dma_bounce_buffer) {
			HDATA(a3000_host)->dma_bounce_len = 0;
			return 1;
		}

		if (!dir_in) {
			/* copy to bounce buffer for a write */
			memcpy(HDATA(a3000_host)->dma_bounce_buffer,
			       cmd->SCp.ptr, cmd->SCp.this_residual);
		}

		addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
	}

	/* setup dma direction */
	if (!dir_in)
		cntr |= CNTR_DDIR;

	/* remember direction */
	HDATA(a3000_host)->dma_dir = dir_in;

	DMA(a3000_host)->CNTR = cntr;

	/* setup DMA *physical* address */
	DMA(a3000_host)->ACR = addr;

	if (dir_in) {
		/* invalidate any cache */
		cache_clear(addr, cmd->SCp.this_residual);
	} else {
		/* push any dirty cache */
		cache_push(addr, cmd->SCp.this_residual);
	}

	/* start DMA */
	mb();			/* make sure setup is completed */
	DMA(a3000_host)->ST_DMA = 1;
	mb();			/* make sure DMA has started before next IO */

	/* return success */
	return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
		     int status)
{
	/* disable SCSI interrupts */
	unsigned short cntr = CNTR_PDMD;

	if (!HDATA(instance)->dma_dir)
		cntr |= CNTR_DDIR;

	DMA(instance)->CNTR = cntr;
	mb();			/* make sure CNTR is updated before next IO */

	/* flush if we were reading */
	if (HDATA(instance)->dma_dir) {
		DMA(instance)->FLUSH = 1;
		mb();		/* don't allow prefetch */
		while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
			barrier();
		mb();		/* no IO until FLUSH is done */
	}

	/* clear a possible interrupt */
	/* I think that this CINT is only necessary if you are
	 * using the terminal count features.   HM 7 Mar 1994
	 */
	DMA(instance)->CINT = 1;

	/* stop DMA */
	DMA(instance)->SP_DMA = 1;
	mb();			/* make sure DMA is stopped before next IO */

	/* restore the CONTROL bits (minus the direction flag) */
	DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
	mb();			/* make sure CNTR is updated before next IO */

	/* copy from a bounce buffer, if necessary */
	if (status && HDATA(instance)->dma_bounce_buffer) {
		if (SCpnt) {
			if (HDATA(instance)->dma_dir && SCpnt)
				memcpy(SCpnt->SCp.ptr,
				       HDATA(instance)->dma_bounce_buffer,
				       SCpnt->SCp.this_residual);
			kfree(HDATA(instance)->dma_bounce_buffer);
			HDATA(instance)->dma_bounce_buffer = NULL;
			HDATA(instance)->dma_bounce_len = 0;
		} else {
			kfree(HDATA(instance)->dma_bounce_buffer);
			HDATA(instance)->dma_bounce_buffer = NULL;
			HDATA(instance)->dma_bounce_len = 0;
		}
	}
}

static int __init a3000_detect(struct scsi_host_template *tpnt)
{
	wd33c93_regs regs;

	if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
		return 0;
	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
		return 0;

	tpnt->proc_name = "A3000";
	tpnt->proc_info = &wd33c93_proc_info;

	a3000_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
	if (a3000_host == NULL)
		goto fail_register;

	a3000_host->base = ZTWO_VADDR(0xDD0000);
	a3000_host->irq = IRQ_AMIGA_PORTS;
	DMA(a3000_host)->DAWR = DAWR_A3000;
	regs.SASR = &(DMA(a3000_host)->SASR);
	regs.SCMD = &(DMA(a3000_host)->SCMD);
	HDATA(a3000_host)->no_sync = 0xff;
	HDATA(a3000_host)->fast = 0;
	HDATA(a3000_host)->dma_mode = CTRL_DMA;
	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
			a3000_intr))
		goto fail_irq;
	DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;

	return 1;

fail_irq:
	scsi_unregister(a3000_host);
fail_register:
	release_mem_region(0xDD0000, 256);
	return 0;
}

static int a3000_bus_reset(struct scsi_cmnd *cmd)
{
	/* FIXME perform bus-specific reset */

	/* FIXME 2: kill this entire function, which should
	   cause mid-layer to call wd33c93_host_reset anyway? */

	spin_lock_irq(cmd->device->host->host_lock);
	wd33c93_host_reset(cmd);
	spin_unlock_irq(cmd->device->host->host_lock);

	return SUCCESS;
}

#define HOSTS_C

static struct scsi_host_template driver_template = {
	.proc_name		= "A3000",
	.name			= "Amiga 3000 built-in SCSI",
	.detect			= a3000_detect,
	.release		= a3000_release,
	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= a3000_bus_reset,
	.eh_host_reset_handler	= wd33c93_host_reset,
	.can_queue		= CAN_QUEUE,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= CMD_PER_LUN,
	.use_clustering		= ENABLE_CLUSTERING
};


#include "scsi_module.c"

static int a3000_release(struct Scsi_Host *instance)
{
	DMA(instance)->CNTR = 0;
	release_mem_region(0xDD0000, 256);
	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	return 1;
}

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	#include <linux/types.h>
1da177e4 LT	2	#include <linux/mm.h>
5a0e3ad6	3	#include <linux/slab.h>
1da177e4	4	#include <linux/blkdev.h>
1da177e4 LT	5	#include <linux/ioport.h>
	6	#include <linux/init.h>
	7	#include <linux/spinlock.h>
	8	#include <linux/interrupt.h>
	9
	10	#include <asm/setup.h>
	11	#include <asm/page.h>
	12	#include <asm/pgtable.h>
	13	#include <asm/amigaints.h>
	14	#include <asm/amigahw.h>
	15	#include <asm/irq.h>
	16
	17	#include "scsi.h"
	18	#include <scsi/scsi_host.h>
	19	#include "wd33c93.h"
	20	#include "a3000.h"
	21
21351013	22	#include <linux/stat.h>
1da177e4	23
21351013 GU	24
	25	#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
	26	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
1da177e4 LT	27
	28	static struct Scsi_Host *a3000_host = NULL;
	29
9387edbe AB	30	static int a3000_release(struct Scsi_Host *instance);
9387edbe AB	31
21351013	32	static irqreturn_t a3000_intr(int irq, void *dummy)
1da177e4 LT	33	{
	34	unsigned long flags;
	35	unsigned int status = DMA(a3000_host)->ISTR;
	36
	37	if (!(status & ISTR_INT_P))
	38	return IRQ_NONE;
21351013	39	if (status & ISTR_INTS) {
1da177e4	40	spin_lock_irqsave(a3000_host->host_lock, flags);
21351013	41	wd33c93_intr(a3000_host);
1da177e4 LT	42	spin_unlock_irqrestore(a3000_host->host_lock, flags);
	43	return IRQ_HANDLED;
	44	}
	45	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	46	return IRQ_NONE;
	47	}
	48
65396410	49	static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
1da177e4	50	{
21351013 GU	51	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	52	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	53
	54	/*
	55	* if the physical address has the wrong alignment, or if
	56	* physical address is bad, or if it is a write and at the
	57	* end of a physical memory chunk, then allocate a bounce
	58	* buffer
	59	*/
	60	if (addr & A3000_XFER_MASK) {
	61	HDATA(a3000_host)->dma_bounce_len =
	62	(cmd->SCp.this_residual + 511) & ~0x1ff;
	63	HDATA(a3000_host)->dma_bounce_buffer =
	64	kmalloc(HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	65
	66	/* can't allocate memory; use PIO */
	67	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	68	HDATA(a3000_host)->dma_bounce_len = 0;
	69	return 1;
	70	}
	71
	72	if (!dir_in) {
	73	/* copy to bounce buffer for a write */
	74	memcpy(HDATA(a3000_host)->dma_bounce_buffer,
	75	cmd->SCp.ptr, cmd->SCp.this_residual);
	76	}
	77
	78	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
1da177e4 LT	79	}
1da177e4 LT	80
21351013 GU	81	/* setup dma direction */
	82	if (!dir_in)
	83	cntr \|= CNTR_DDIR;
1da177e4	84
21351013 GU	85	/* remember direction */
21351013 GU	86	HDATA(a3000_host)->dma_dir = dir_in;
1da177e4	87
21351013	88	DMA(a3000_host)->CNTR = cntr;
1da177e4	89
21351013 GU	90	/* setup DMA physical address */
21351013 GU	91	DMA(a3000_host)->ACR = addr;
1da177e4	92
21351013 GU	93	if (dir_in) {
	94	/* invalidate any cache */
	95	cache_clear(addr, cmd->SCp.this_residual);
	96	} else {
	97	/* push any dirty cache */
	98	cache_push(addr, cmd->SCp.this_residual);
	99	}
1da177e4	100
21351013 GU	101	/* start DMA */
	102	mb(); /* make sure setup is completed */
	103	DMA(a3000_host)->ST_DMA = 1;
	104	mb(); /* make sure DMA has started before next IO */
1da177e4	105
21351013 GU	106	/* return success */
21351013 GU	107	return 0;
1da177e4 LT	108	}
1da177e4 LT	109
65396410 HK	110	static void dma_stop(struct Scsi_Host instance, struct scsi_cmnd SCpnt,
65396410 HK	111	int status)
1da177e4	112	{
21351013 GU	113	/* disable SCSI interrupts */
	114	unsigned short cntr = CNTR_PDMD;
	115
	116	if (!HDATA(instance)->dma_dir)
	117	cntr \|= CNTR_DDIR;
	118
	119	DMA(instance)->CNTR = cntr;
	120	mb(); /* make sure CNTR is updated before next IO */
	121
	122	/* flush if we were reading */
	123	if (HDATA(instance)->dma_dir) {
	124	DMA(instance)->FLUSH = 1;
	125	mb(); /* don't allow prefetch */
	126	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	127	barrier();
	128	mb(); /* no IO until FLUSH is done */
	129	}
	130
	131	/* clear a possible interrupt */
	132	/* I think that this CINT is only necessary if you are
	133	* using the terminal count features. HM 7 Mar 1994
	134	*/
	135	DMA(instance)->CINT = 1;
	136
	137	/* stop DMA */
	138	DMA(instance)->SP_DMA = 1;
	139	mb(); /* make sure DMA is stopped before next IO */
	140
	141	/* restore the CONTROL bits (minus the direction flag) */
	142	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	143	mb(); /* make sure CNTR is updated before next IO */
	144
	145	/* copy from a bounce buffer, if necessary */
	146	if (status && HDATA(instance)->dma_bounce_buffer) {
	147	if (SCpnt) {
	148	if (HDATA(instance)->dma_dir && SCpnt)
	149	memcpy(SCpnt->SCp.ptr,
	150	HDATA(instance)->dma_bounce_buffer,
	151	SCpnt->SCp.this_residual);
	152	kfree(HDATA(instance)->dma_bounce_buffer);
	153	HDATA(instance)->dma_bounce_buffer = NULL;
	154	HDATA(instance)->dma_bounce_len = 0;
	155	} else {
	156	kfree(HDATA(instance)->dma_bounce_buffer);
	157	HDATA(instance)->dma_bounce_buffer = NULL;
	158	HDATA(instance)->dma_bounce_len = 0;
	159	}
1da177e4	160	}
1da177e4 LT	161	}
1da177e4 LT	162
9387edbe	163	static int __init a3000_detect(struct scsi_host_template *tpnt)
1da177e4	164	{
21351013 GU	165	wd33c93_regs regs;
	166
	167	if (!MACH_IS_AMIGA \|\| !AMIGAHW_PRESENT(A3000_SCSI))
	168	return 0;
	169	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	170	return 0;
	171
	172	tpnt->proc_name = "A3000";
	173	tpnt->proc_info = &wd33c93_proc_info;
	174
	175	a3000_host = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
	176	if (a3000_host == NULL)
	177	goto fail_register;
	178
	179	a3000_host->base = ZTWO_VADDR(0xDD0000);
	180	a3000_host->irq = IRQ_AMIGA_PORTS;
	181	DMA(a3000_host)->DAWR = DAWR_A3000;
	182	regs.SASR = &(DMA(a3000_host)->SASR);
	183	regs.SCMD = &(DMA(a3000_host)->SCMD);
	184	HDATA(a3000_host)->no_sync = 0xff;
	185	HDATA(a3000_host)->fast = 0;
	186	HDATA(a3000_host)->dma_mode = CTRL_DMA;
	187	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
	188	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
	189	a3000_intr))
	190	goto fail_irq;
	191	DMA(a3000_host)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	192
	193	return 1;
1da177e4 LT	194
1da177e4 LT	195	fail_irq:
21351013	196	scsi_unregister(a3000_host);
1da177e4	197	fail_register:
21351013 GU	198	release_mem_region(0xDD0000, 256);
21351013 GU	199	return 0;
1da177e4 LT	200	}
1da177e4 LT	201
65396410	202	static int a3000_bus_reset(struct scsi_cmnd *cmd)
1da177e4 LT	203	{
1da177e4 LT	204	/* FIXME perform bus-specific reset */
21351013	205
df0ae249 JG	206	/* FIXME 2: kill this entire function, which should
df0ae249 JG	207	cause mid-layer to call wd33c93_host_reset anyway? */
68b3aa7c JG	208
68b3aa7c JG	209	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	210	wd33c93_host_reset(cmd);
68b3aa7c JG	211	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	212
1da177e4 LT	213	return SUCCESS;
	214	}
	215
	216	#define HOSTS_C
	217
d0be4a7d	218	static struct scsi_host_template driver_template = {
1da177e4 LT	219	.proc_name = "A3000",
	220	.name = "Amiga 3000 built-in SCSI",
	221	.detect = a3000_detect,
	222	.release = a3000_release,
	223	.queuecommand = wd33c93_queuecommand,
	224	.eh_abort_handler = wd33c93_abort,
	225	.eh_bus_reset_handler = a3000_bus_reset,
	226	.eh_host_reset_handler = wd33c93_host_reset,
	227	.can_queue = CAN_QUEUE,
	228	.this_id = 7,
	229	.sg_tablesize = SG_ALL,
	230	.cmd_per_lun = CMD_PER_LUN,
	231	.use_clustering = ENABLE_CLUSTERING
	232	};
	233
	234
	235	#include "scsi_module.c"
	236
9387edbe	237	static int a3000_release(struct Scsi_Host *instance)
1da177e4	238	{
21351013 GU	239	DMA(instance)->CNTR = 0;
	240	release_mem_region(0xDD0000, 256);
	241	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	242	return 1;
1da177e4 LT	243	}
	244
	245	MODULE_LICENSE("GPL");