1#include <linux/types.h>
2#include <linux/mm.h>
3#include <linux/blkdev.h>
4#include <linux/ioport.h>
5#include <linux/init.h>
6#include <linux/spinlock.h>
7#include <linux/interrupt.h>
8
9#include <asm/setup.h>
10#include <asm/page.h>
11#include <asm/pgtable.h>
12#include <asm/amigaints.h>
13#include <asm/amigahw.h>
14#include <asm/irq.h>
15
16#include "scsi.h"
17#include <scsi/scsi_host.h>
18#include "wd33c93.h"
19#include "a3000.h"
20
21#include<linux/stat.h>
22
23#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
24#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
25
26static struct Scsi_Host *a3000_host = NULL;
27
28static irqreturn_t a3000_intr (int irq, void *dummy)
29{
30	unsigned long flags;
31	unsigned int status = DMA(a3000_host)->ISTR;
32
33	if (!(status & ISTR_INT_P))
34		return IRQ_NONE;
35	if (status & ISTR_INTS)
36	{
37		spin_lock_irqsave(a3000_host->host_lock, flags);
38		wd33c93_intr (a3000_host);
39		spin_unlock_irqrestore(a3000_host->host_lock, flags);
40		return IRQ_HANDLED;
41	}
42	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
43	return IRQ_NONE;
44}
45
46static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
47{
48    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
49    unsigned long addr = virt_to_bus(cmd->SCp.ptr);
50
51    /*
52     * if the physical address has the wrong alignment, or if
53     * physical address is bad, or if it is a write and at the
54     * end of a physical memory chunk, then allocate a bounce
55     * buffer
56     */
57    if (addr & A3000_XFER_MASK ||
58	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
59    {
60	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61	    & ~0x1ff;
62	HDATA(a3000_host)->dma_bounce_buffer =
63	    kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
64
65	/* can't allocate memory; use PIO */
66	if (!HDATA(a3000_host)->dma_bounce_buffer) {
67	    HDATA(a3000_host)->dma_bounce_len = 0;
68	    return 1;
69	}
70
71	if (!dir_in) {
72	    /* copy to bounce buffer for a write */
73	    if (cmd->use_sg) {
74		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
75			cmd->SCp.ptr, cmd->SCp.this_residual);
76	    } else
77		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
78			cmd->request_buffer, cmd->request_bufflen);
79	}
80
81	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
82    }
83
84    /* setup dma direction */
85    if (!dir_in)
86	cntr |= CNTR_DDIR;
87
88    /* remember direction */
89    HDATA(a3000_host)->dma_dir = dir_in;
90
91    DMA(a3000_host)->CNTR = cntr;
92
93    /* setup DMA *physical* address */
94    DMA(a3000_host)->ACR = addr;
95
96    if (dir_in)
97  	/* invalidate any cache */
98	cache_clear (addr, cmd->SCp.this_residual);
99    else
100	/* push any dirty cache */
101	cache_push (addr, cmd->SCp.this_residual);
102
103    /* start DMA */
104    mb();			/* make sure setup is completed */
105    DMA(a3000_host)->ST_DMA = 1;
106    mb();			/* make sure DMA has started before next IO */
107
108    /* return success */
109    return 0;
110}
111
112static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
113		     int status)
114{
115    /* disable SCSI interrupts */
116    unsigned short cntr = CNTR_PDMD;
117
118    if (!HDATA(instance)->dma_dir)
119	cntr |= CNTR_DDIR;
120
121    DMA(instance)->CNTR = cntr;
122    mb();			/* make sure CNTR is updated before next IO */
123
124    /* flush if we were reading */
125    if (HDATA(instance)->dma_dir) {
126	DMA(instance)->FLUSH = 1;
127	mb();			/* don't allow prefetch */
128	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
129	    barrier();
130	mb();			/* no IO until FLUSH is done */
131    }
132
133    /* clear a possible interrupt */
134    /* I think that this CINT is only necessary if you are
135     * using the terminal count features.   HM 7 Mar 1994
136     */
137    DMA(instance)->CINT = 1;
138
139    /* stop DMA */
140    DMA(instance)->SP_DMA = 1;
141    mb();			/* make sure DMA is stopped before next IO */
142
143    /* restore the CONTROL bits (minus the direction flag) */
144    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
145    mb();			/* make sure CNTR is updated before next IO */
146
147    /* copy from a bounce buffer, if necessary */
148    if (status && HDATA(instance)->dma_bounce_buffer) {
149	if (SCpnt && SCpnt->use_sg) {
150	    if (HDATA(instance)->dma_dir && SCpnt)
151		memcpy (SCpnt->SCp.ptr,
152			HDATA(instance)->dma_bounce_buffer,
153			SCpnt->SCp.this_residual);
154	    kfree (HDATA(instance)->dma_bounce_buffer);
155	    HDATA(instance)->dma_bounce_buffer = NULL;
156	    HDATA(instance)->dma_bounce_len = 0;
157	} else {
158	    if (HDATA(instance)->dma_dir && SCpnt)
159		memcpy (SCpnt->request_buffer,
160			HDATA(instance)->dma_bounce_buffer,
161			SCpnt->request_bufflen);
162
163	    kfree (HDATA(instance)->dma_bounce_buffer);
164	    HDATA(instance)->dma_bounce_buffer = NULL;
165	    HDATA(instance)->dma_bounce_len = 0;
166	}
167    }
168}
169
170int __init a3000_detect(struct scsi_host_template *tpnt)
171{
172    wd33c93_regs regs;
173
174    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
175	return 0;
176    if (!request_mem_region(0xDD0000, 256, "wd33c93"))
177	return 0;
178
179    tpnt->proc_name = "A3000";
180    tpnt->proc_info = &wd33c93_proc_info;
181
182    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
183    if (a3000_host == NULL)
184	goto fail_register;
185
186    a3000_host->base = ZTWO_VADDR(0xDD0000);
187    a3000_host->irq = IRQ_AMIGA_PORTS;
188    DMA(a3000_host)->DAWR = DAWR_A3000;
189    regs.SASR = &(DMA(a3000_host)->SASR);
190    regs.SCMD = &(DMA(a3000_host)->SCMD);
191    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
192    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
193		    a3000_intr))
194        goto fail_irq;
195    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
196
197    return 1;
198
199fail_irq:
200    wd33c93_release();
201    scsi_unregister(a3000_host);
202fail_register:
203    release_mem_region(0xDD0000, 256);
204    return 0;
205}
206
207static int a3000_bus_reset(struct scsi_cmnd *cmd)
208{
209
210
211	spin_lock_irq(cmd->device->host->host_lock);
212	wd33c93_host_reset(cmd);
213	spin_unlock_irq(cmd->device->host->host_lock);
214
215	return SUCCESS;
216}
217
218#define HOSTS_C
219
220static struct scsi_host_template driver_template = {
221	.proc_name		= "A3000",
222	.name			= "Amiga 3000 built-in SCSI",
223	.detect			= a3000_detect,
224	.release		= a3000_release,
225	.queuecommand		= wd33c93_queuecommand,
226	.eh_abort_handler	= wd33c93_abort,
227	.eh_bus_reset_handler	= a3000_bus_reset,
228	.eh_host_reset_handler	= wd33c93_host_reset,
229	.can_queue		= CAN_QUEUE,
230	.this_id		= 7,
231	.sg_tablesize		= SG_ALL,
232	.cmd_per_lun		= CMD_PER_LUN,
233	.use_clustering		= ENABLE_CLUSTERING
234};
235
236
237#include "scsi_module.c"
238
239int a3000_release(struct Scsi_Host *instance)
240{
241    wd33c93_release();
242    DMA(instance)->CNTR = 0;
243    release_mem_region(0xDD0000, 256);
244    free_irq(IRQ_AMIGA_PORTS, a3000_intr);
245    return 1;
246}
247
248MODULE_LICENSE("GPL");
249