[linux.git] / drivers / scsi / a3000.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/sched.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 irqreturn_t a3000_intr (int irq, void *dummy, struct pt_regs *fp)
{
	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 (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 ||
	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
    {
	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 */
	    if (cmd->use_sg) {
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->SCp.ptr, cmd->SCp.this_residual);
	    } else
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->request_buffer, cmd->request_bufflen);
	}

	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, 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 && SCpnt->use_sg) {
	    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 {
	    if (HDATA(instance)->dma_dir && SCpnt)
		memcpy (SCpnt->request_buffer,
			HDATA(instance)->dma_bounce_buffer,
			SCpnt->request_bufflen);

	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	}
    }
}

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);
    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
		    a3000_intr))
        goto fail_irq;
    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;

    return 1;

fail_irq:
    wd33c93_release();
    scsi_unregister(a3000_host);
fail_register:
    release_mem_region(0xDD0000, 256);
    return 0;
}

static int a3000_bus_reset(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"

int a3000_release(struct Scsi_Host *instance)
{
    wd33c93_release();
    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>
	2	#include <linux/mm.h>
	3	#include <linux/blkdev.h>
	4	#include <linux/sched.h>
	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
	22	#include<linux/stat.h>
	23
	24	#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
	25	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
	26
	27	static struct Scsi_Host *a3000_host = NULL;
	28
	29	static irqreturn_t a3000_intr (int irq, void dummy, struct pt_regs fp)
	30	{
	31	unsigned long flags;
	32	unsigned int status = DMA(a3000_host)->ISTR;
	33
	34	if (!(status & ISTR_INT_P))
	35	return IRQ_NONE;
	36	if (status & ISTR_INTS)
	37	{
	38	spin_lock_irqsave(a3000_host->host_lock, flags);
	39	wd33c93_intr (a3000_host);
	40	spin_unlock_irqrestore(a3000_host->host_lock, flags);
	41	return IRQ_HANDLED;
	42	}
	43	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	44	return IRQ_NONE;
	45	}
	46
	47	static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
	48	{
	49	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	50	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	51
	52	/*
	53	* if the physical address has the wrong alignment, or if
	54	* physical address is bad, or if it is a write and at the
	55	* end of a physical memory chunk, then allocate a bounce
	56	* buffer
	57	*/
	58	if (addr & A3000_XFER_MASK \|\|
	59	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
	60	{
	61	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	62	& ~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	if (cmd->use_sg) {
75	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
76	cmd->SCp.ptr, cmd->SCp.this_residual);
77	} else
78	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
79	cmd->request_buffer, cmd->request_bufflen);
80	}
81
82	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
83	}
84
85	/* setup dma direction */
86	if (!dir_in)
87	cntr \|= CNTR_DDIR;
88
89	/* remember direction */
90	HDATA(a3000_host)->dma_dir = dir_in;
91
92	DMA(a3000_host)->CNTR = cntr;
93
94	/* setup DMA physical address */
95	DMA(a3000_host)->ACR = addr;
96
97	if (dir_in)
98	/* invalidate any cache */
99	cache_clear (addr, cmd->SCp.this_residual);
100	else
101	/* push any dirty cache */
102	cache_push (addr, cmd->SCp.this_residual);
103
104	/* start DMA */
105	mb(); /* make sure setup is completed */
106	DMA(a3000_host)->ST_DMA = 1;
107	mb(); /* make sure DMA has started before next IO */
108
109	/* return success */
110	return 0;
111	}
112
113	static void dma_stop (struct Scsi_Host instance, Scsi_Cmnd SCpnt,
114	int status)
115	{
116	/* disable SCSI interrupts */
117	unsigned short cntr = CNTR_PDMD;
118
119	if (!HDATA(instance)->dma_dir)
120	cntr \|= CNTR_DDIR;
121
122	DMA(instance)->CNTR = cntr;
123	mb(); /* make sure CNTR is updated before next IO */
124
125	/* flush if we were reading */
126	if (HDATA(instance)->dma_dir) {
127	DMA(instance)->FLUSH = 1;
128	mb(); /* don't allow prefetch */
129	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
130	barrier();
131	mb(); /* no IO until FLUSH is done */
132	}
133
134	/* clear a possible interrupt */
135	/* I think that this CINT is only necessary if you are
136	* using the terminal count features. HM 7 Mar 1994
137	*/
138	DMA(instance)->CINT = 1;
139
140	/* stop DMA */
141	DMA(instance)->SP_DMA = 1;
142	mb(); /* make sure DMA is stopped before next IO */
143
144	/* restore the CONTROL bits (minus the direction flag) */
145	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
146	mb(); /* make sure CNTR is updated before next IO */
147
148	/* copy from a bounce buffer, if necessary */
149	if (status && HDATA(instance)->dma_bounce_buffer) {
150	if (SCpnt && SCpnt->use_sg) {
151	if (HDATA(instance)->dma_dir && SCpnt)
152	memcpy (SCpnt->SCp.ptr,
153	HDATA(instance)->dma_bounce_buffer,
154	SCpnt->SCp.this_residual);
155	kfree (HDATA(instance)->dma_bounce_buffer);
156	HDATA(instance)->dma_bounce_buffer = NULL;
157	HDATA(instance)->dma_bounce_len = 0;
158	} else {
159	if (HDATA(instance)->dma_dir && SCpnt)
160	memcpy (SCpnt->request_buffer,
161	HDATA(instance)->dma_bounce_buffer,
162	SCpnt->request_bufflen);
163
164	kfree (HDATA(instance)->dma_bounce_buffer);
165	HDATA(instance)->dma_bounce_buffer = NULL;
166	HDATA(instance)->dma_bounce_len = 0;
167	}
168	}
169	}
170
d0be4a7d	171	int __init a3000_detect(struct scsi_host_template *tpnt)
1da177e4 LT	172	{
	173	wd33c93_regs regs;
	174
	175	if (!MACH_IS_AMIGA \|\| !AMIGAHW_PRESENT(A3000_SCSI))
	176	return 0;
	177	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	178	return 0;
	179
	180	tpnt->proc_name = "A3000";
	181	tpnt->proc_info = &wd33c93_proc_info;
	182
	183	a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
	184	if (a3000_host == NULL)
	185	goto fail_register;
	186
	187	a3000_host->base = ZTWO_VADDR(0xDD0000);
	188	a3000_host->irq = IRQ_AMIGA_PORTS;
	189	DMA(a3000_host)->DAWR = DAWR_A3000;
	190	regs.SASR = &(DMA(a3000_host)->SASR);
	191	regs.SCMD = &(DMA(a3000_host)->SCMD);
	192	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
	193	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
	194	a3000_intr))
	195	goto fail_irq;
	196	DMA(a3000_host)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	197
	198	return 1;
	199
	200	fail_irq:
	201	wd33c93_release();
	202	scsi_unregister(a3000_host);
	203	fail_register:
	204	release_mem_region(0xDD0000, 256);
	205	return 0;
	206	}
	207
	208	static int a3000_bus_reset(Scsi_Cmnd *cmd)
	209	{
	210	/* FIXME perform bus-specific reset */
df0ae249 JG	211
	212	/* FIXME 2: kill this entire function, which should
	213	cause mid-layer to call wd33c93_host_reset anyway? */
68b3aa7c JG	214
68b3aa7c JG	215	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	216	wd33c93_host_reset(cmd);
68b3aa7c JG	217	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	218
1da177e4 LT	219	return SUCCESS;
	220	}
	221
	222	#define HOSTS_C
	223
d0be4a7d	224	static struct scsi_host_template driver_template = {
1da177e4 LT	225	.proc_name = "A3000",
	226	.name = "Amiga 3000 built-in SCSI",
	227	.detect = a3000_detect,
	228	.release = a3000_release,
	229	.queuecommand = wd33c93_queuecommand,
	230	.eh_abort_handler = wd33c93_abort,
	231	.eh_bus_reset_handler = a3000_bus_reset,
	232	.eh_host_reset_handler = wd33c93_host_reset,
	233	.can_queue = CAN_QUEUE,
	234	.this_id = 7,
	235	.sg_tablesize = SG_ALL,
	236	.cmd_per_lun = CMD_PER_LUN,
	237	.use_clustering = ENABLE_CLUSTERING
	238	};
	239
	240
	241	#include "scsi_module.c"
	242
	243	int a3000_release(struct Scsi_Host *instance)
	244	{
	245	wd33c93_release();
	246	DMA(instance)->CNTR = 0;
	247	release_mem_region(0xDD0000, 256);
	248	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	249	return 1;
	250	}
	251
	252	MODULE_LICENSE("GPL");