1#include <linux/types.h>
  2#include <linux/mm.h>
  3#include <linux/ioport.h>
  4#include <linux/init.h>
  5#include <linux/slab.h>
  6#include <linux/spinlock.h>
  7#include <linux/interrupt.h>
  8#include <linux/platform_device.h>
  9#include <linux/module.h>
 10
 11#include <asm/page.h>
 12#include <asm/pgtable.h>
 13#include <asm/amigaints.h>
 14#include <asm/amigahw.h>
 15
 16#include "scsi.h"
 17#include "wd33c93.h"
 18#include "a3000.h"
 19
 20
 21struct a3000_hostdata {
 22	struct WD33C93_hostdata wh;
 23	struct a3000_scsiregs *regs;
 24};
 25
 26static irqreturn_t a3000_intr(int irq, void *data)
 27{
 28	struct Scsi_Host *instance = data;
 29	struct a3000_hostdata *hdata = shost_priv(instance);
 30	unsigned int status = hdata->regs->ISTR;
 31	unsigned long flags;
 32
 33	if (!(status & ISTR_INT_P))
 34		return IRQ_NONE;
 35	if (status & ISTR_INTS) {
 36		spin_lock_irqsave(instance->host_lock, flags);
 37		wd33c93_intr(instance);
 38		spin_unlock_irqrestore(instance->host_lock, flags);
 39		return IRQ_HANDLED;
 40	}
 41	pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
 42	return IRQ_NONE;
 43}
 44
 45static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 46{
 47	struct Scsi_Host *instance = cmd->device->host;
 48	struct a3000_hostdata *hdata = shost_priv(instance);
 49	struct WD33C93_hostdata *wh = &hdata->wh;
 50	struct a3000_scsiregs *regs = hdata->regs;
 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		wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
 62		wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
 63						GFP_KERNEL);
 64
 65		/* can't allocate memory; use PIO */
 66		if (!wh->dma_bounce_buffer) {
 67			wh->dma_bounce_len = 0;
 68			return 1;
 69		}
 70
 71		if (!dir_in) {
 72			/* copy to bounce buffer for a write */
 73			memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
 74			       cmd->SCp.this_residual);
 75		}
 76
 77		addr = virt_to_bus(wh->dma_bounce_buffer);
 78	}
 79
 80	/* setup dma direction */
 81	if (!dir_in)
 82		cntr |= CNTR_DDIR;
 83
 84	/* remember direction */
 85	wh->dma_dir = dir_in;
 86
 87	regs->CNTR = cntr;
 88
 89	/* setup DMA *physical* address */
 90	regs->ACR = addr;
 91
 92	if (dir_in) {
 93		/* invalidate any cache */
 94		cache_clear(addr, cmd->SCp.this_residual);
 95	} else {
 96		/* push any dirty cache */
 97		cache_push(addr, cmd->SCp.this_residual);
 98	}
 99
100	/* start DMA */
101	mb();			/* make sure setup is completed */
102	regs->ST_DMA = 1;
103	mb();			/* make sure DMA has started before next IO */
104
105	/* return success */
106	return 0;
107}
108
109static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
110		     int status)
111{
112	struct a3000_hostdata *hdata = shost_priv(instance);
113	struct WD33C93_hostdata *wh = &hdata->wh;
114	struct a3000_scsiregs *regs = hdata->regs;
115
116	/* disable SCSI interrupts */
117	unsigned short cntr = CNTR_PDMD;
118
119	if (!wh->dma_dir)
120		cntr |= CNTR_DDIR;
121
122	regs->CNTR = cntr;
123	mb();			/* make sure CNTR is updated before next IO */
124
125	/* flush if we were reading */
126	if (wh->dma_dir) {
127		regs->FLUSH = 1;
128		mb();		/* don't allow prefetch */
129		while (!(regs->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	regs->CINT = 1;
139
140	/* stop DMA */
141	regs->SP_DMA = 1;
142	mb();			/* make sure DMA is stopped before next IO */
143
144	/* restore the CONTROL bits (minus the direction flag) */
145	regs->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 && wh->dma_bounce_buffer) {
150		if (SCpnt) {
151			if (wh->dma_dir && SCpnt)
152				memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
153				       SCpnt->SCp.this_residual);
154			kfree(wh->dma_bounce_buffer);
155			wh->dma_bounce_buffer = NULL;
156			wh->dma_bounce_len = 0;
157		} else {
158			kfree(wh->dma_bounce_buffer);
159			wh->dma_bounce_buffer = NULL;
160			wh->dma_bounce_len = 0;
161		}
162	}
163}
164
165static int a3000_bus_reset(struct scsi_cmnd *cmd)
166{
167	struct Scsi_Host *instance = cmd->device->host;
168
169	/* FIXME perform bus-specific reset */
170
171	/* FIXME 2: kill this entire function, which should
172	   cause mid-layer to call wd33c93_host_reset anyway? */
173
174	spin_lock_irq(instance->host_lock);
175	wd33c93_host_reset(cmd);
176	spin_unlock_irq(instance->host_lock);
177
178	return SUCCESS;
179}
180
181static struct scsi_host_template amiga_a3000_scsi_template = {
182	.module			= THIS_MODULE,
183	.name			= "Amiga 3000 built-in SCSI",
184	.show_info		= wd33c93_show_info,
185	.write_info		= wd33c93_write_info,
186	.proc_name		= "A3000",
187	.queuecommand		= wd33c93_queuecommand,
188	.eh_abort_handler	= wd33c93_abort,
189	.eh_bus_reset_handler	= a3000_bus_reset,
190	.eh_host_reset_handler	= wd33c93_host_reset,
191	.can_queue		= CAN_QUEUE,
192	.this_id		= 7,
193	.sg_tablesize		= SG_ALL,
194	.cmd_per_lun		= CMD_PER_LUN,
195	.use_clustering		= ENABLE_CLUSTERING
196};
197
198static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
199{
200	struct resource *res;
201	struct Scsi_Host *instance;
202	int error;
203	struct a3000_scsiregs *regs;
204	wd33c93_regs wdregs;
205	struct a3000_hostdata *hdata;
206
207	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
208	if (!res)
209		return -ENODEV;
210
211	if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
212		return -EBUSY;
213
214	instance = scsi_host_alloc(&amiga_a3000_scsi_template,
215				   sizeof(struct a3000_hostdata));
216	if (!instance) {
217		error = -ENOMEM;
218		goto fail_alloc;
219	}
220
221	instance->irq = IRQ_AMIGA_PORTS;
222
223	regs = ZTWO_VADDR(res->start);
224	regs->DAWR = DAWR_A3000;
225
226	wdregs.SASR = &regs->SASR;
227	wdregs.SCMD = &regs->SCMD;
228
229	hdata = shost_priv(instance);
230	hdata->wh.no_sync = 0xff;
231	hdata->wh.fast = 0;
232	hdata->wh.dma_mode = CTRL_DMA;
233	hdata->regs = regs;
234
235	wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
236	error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
237			    "A3000 SCSI", instance);
238	if (error)
239		goto fail_irq;
240
241	regs->CNTR = CNTR_PDMD | CNTR_INTEN;
242
243	error = scsi_add_host(instance, NULL);
244	if (error)
245		goto fail_host;
246
247	platform_set_drvdata(pdev, instance);
248
249	scsi_scan_host(instance);
250	return 0;
251
252fail_host:
253	free_irq(IRQ_AMIGA_PORTS, instance);
254fail_irq:
255	scsi_host_put(instance);
256fail_alloc:
257	release_mem_region(res->start, resource_size(res));
258	return error;
259}
260
261static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
262{
263	struct Scsi_Host *instance = platform_get_drvdata(pdev);
264	struct a3000_hostdata *hdata = shost_priv(instance);
265	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
266
267	hdata->regs->CNTR = 0;
268	scsi_remove_host(instance);
269	free_irq(IRQ_AMIGA_PORTS, instance);
270	scsi_host_put(instance);
271	release_mem_region(res->start, resource_size(res));
272	return 0;
273}
274
275static struct platform_driver amiga_a3000_scsi_driver = {
276	.remove = __exit_p(amiga_a3000_scsi_remove),
277	.driver   = {
278		.name	= "amiga-a3000-scsi",
279		.owner	= THIS_MODULE,
280	},
281};
282
283module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
284
285MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
286MODULE_LICENSE("GPL");
287MODULE_ALIAS("platform:amiga-a3000-scsi");

  1// SPDX-License-Identifier: GPL-2.0-only
  2#include <linux/types.h>
  3#include <linux/mm.h>
  4#include <linux/ioport.h>
  5#include <linux/init.h>
  6#include <linux/slab.h>
  7#include <linux/spinlock.h>
  8#include <linux/interrupt.h>
  9#include <linux/platform_device.h>
 10#include <linux/module.h>
 11
 12#include <asm/page.h>
 
 13#include <asm/amigaints.h>
 14#include <asm/amigahw.h>
 15
 16#include "scsi.h"
 17#include "wd33c93.h"
 18#include "a3000.h"
 19
 20
 21struct a3000_hostdata {
 22	struct WD33C93_hostdata wh;
 23	struct a3000_scsiregs *regs;
 24};
 25
 26static irqreturn_t a3000_intr(int irq, void *data)
 27{
 28	struct Scsi_Host *instance = data;
 29	struct a3000_hostdata *hdata = shost_priv(instance);
 30	unsigned int status = hdata->regs->ISTR;
 31	unsigned long flags;
 32
 33	if (!(status & ISTR_INT_P))
 34		return IRQ_NONE;
 35	if (status & ISTR_INTS) {
 36		spin_lock_irqsave(instance->host_lock, flags);
 37		wd33c93_intr(instance);
 38		spin_unlock_irqrestore(instance->host_lock, flags);
 39		return IRQ_HANDLED;
 40	}
 41	pr_warn("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
 42	return IRQ_NONE;
 43}
 44
 45static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 46{
 47	struct Scsi_Host *instance = cmd->device->host;
 48	struct a3000_hostdata *hdata = shost_priv(instance);
 49	struct WD33C93_hostdata *wh = &hdata->wh;
 50	struct a3000_scsiregs *regs = hdata->regs;
 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		wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
 62		wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
 63						GFP_KERNEL);
 64
 65		/* can't allocate memory; use PIO */
 66		if (!wh->dma_bounce_buffer) {
 67			wh->dma_bounce_len = 0;
 68			return 1;
 69		}
 70
 71		if (!dir_in) {
 72			/* copy to bounce buffer for a write */
 73			memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
 74			       cmd->SCp.this_residual);
 75		}
 76
 77		addr = virt_to_bus(wh->dma_bounce_buffer);
 78	}
 79
 80	/* setup dma direction */
 81	if (!dir_in)
 82		cntr |= CNTR_DDIR;
 83
 84	/* remember direction */
 85	wh->dma_dir = dir_in;
 86
 87	regs->CNTR = cntr;
 88
 89	/* setup DMA *physical* address */
 90	regs->ACR = addr;
 91
 92	if (dir_in) {
 93		/* invalidate any cache */
 94		cache_clear(addr, cmd->SCp.this_residual);
 95	} else {
 96		/* push any dirty cache */
 97		cache_push(addr, cmd->SCp.this_residual);
 98	}
 99
100	/* start DMA */
101	mb();			/* make sure setup is completed */
102	regs->ST_DMA = 1;
103	mb();			/* make sure DMA has started before next IO */
104
105	/* return success */
106	return 0;
107}
108
109static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
110		     int status)
111{
112	struct a3000_hostdata *hdata = shost_priv(instance);
113	struct WD33C93_hostdata *wh = &hdata->wh;
114	struct a3000_scsiregs *regs = hdata->regs;
115
116	/* disable SCSI interrupts */
117	unsigned short cntr = CNTR_PDMD;
118
119	if (!wh->dma_dir)
120		cntr |= CNTR_DDIR;
121
122	regs->CNTR = cntr;
123	mb();			/* make sure CNTR is updated before next IO */
124
125	/* flush if we were reading */
126	if (wh->dma_dir) {
127		regs->FLUSH = 1;
128		mb();		/* don't allow prefetch */
129		while (!(regs->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	regs->CINT = 1;
139
140	/* stop DMA */
141	regs->SP_DMA = 1;
142	mb();			/* make sure DMA is stopped before next IO */
143
144	/* restore the CONTROL bits (minus the direction flag) */
145	regs->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 && wh->dma_bounce_buffer) {
150		if (SCpnt) {
151			if (wh->dma_dir && SCpnt)
152				memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
153				       SCpnt->SCp.this_residual);
154			kfree(wh->dma_bounce_buffer);
155			wh->dma_bounce_buffer = NULL;
156			wh->dma_bounce_len = 0;
157		} else {
158			kfree(wh->dma_bounce_buffer);
159			wh->dma_bounce_buffer = NULL;
160			wh->dma_bounce_len = 0;
161		}
162	}
163}
164
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
165static struct scsi_host_template amiga_a3000_scsi_template = {
166	.module			= THIS_MODULE,
167	.name			= "Amiga 3000 built-in SCSI",
168	.show_info		= wd33c93_show_info,
169	.write_info		= wd33c93_write_info,
170	.proc_name		= "A3000",
171	.queuecommand		= wd33c93_queuecommand,
172	.eh_abort_handler	= wd33c93_abort,
 
173	.eh_host_reset_handler	= wd33c93_host_reset,
174	.can_queue		= CAN_QUEUE,
175	.this_id		= 7,
176	.sg_tablesize		= SG_ALL,
177	.cmd_per_lun		= CMD_PER_LUN,
 
178};
179
180static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
181{
182	struct resource *res;
183	struct Scsi_Host *instance;
184	int error;
185	struct a3000_scsiregs *regs;
186	wd33c93_regs wdregs;
187	struct a3000_hostdata *hdata;
188
189	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190	if (!res)
191		return -ENODEV;
192
193	if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
194		return -EBUSY;
195
196	instance = scsi_host_alloc(&amiga_a3000_scsi_template,
197				   sizeof(struct a3000_hostdata));
198	if (!instance) {
199		error = -ENOMEM;
200		goto fail_alloc;
201	}
202
203	instance->irq = IRQ_AMIGA_PORTS;
204
205	regs = ZTWO_VADDR(res->start);
206	regs->DAWR = DAWR_A3000;
207
208	wdregs.SASR = &regs->SASR;
209	wdregs.SCMD = &regs->SCMD;
210
211	hdata = shost_priv(instance);
212	hdata->wh.no_sync = 0xff;
213	hdata->wh.fast = 0;
214	hdata->wh.dma_mode = CTRL_DMA;
215	hdata->regs = regs;
216
217	wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
218	error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
219			    "A3000 SCSI", instance);
220	if (error)
221		goto fail_irq;
222
223	regs->CNTR = CNTR_PDMD | CNTR_INTEN;
224
225	error = scsi_add_host(instance, NULL);
226	if (error)
227		goto fail_host;
228
229	platform_set_drvdata(pdev, instance);
230
231	scsi_scan_host(instance);
232	return 0;
233
234fail_host:
235	free_irq(IRQ_AMIGA_PORTS, instance);
236fail_irq:
237	scsi_host_put(instance);
238fail_alloc:
239	release_mem_region(res->start, resource_size(res));
240	return error;
241}
242
243static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
244{
245	struct Scsi_Host *instance = platform_get_drvdata(pdev);
246	struct a3000_hostdata *hdata = shost_priv(instance);
247	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
248
249	hdata->regs->CNTR = 0;
250	scsi_remove_host(instance);
251	free_irq(IRQ_AMIGA_PORTS, instance);
252	scsi_host_put(instance);
253	release_mem_region(res->start, resource_size(res));
254	return 0;
255}
256
257static struct platform_driver amiga_a3000_scsi_driver = {
258	.remove = __exit_p(amiga_a3000_scsi_remove),
259	.driver   = {
260		.name	= "amiga-a3000-scsi",
 
261	},
262};
263
264module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
265
266MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
267MODULE_LICENSE("GPL");
268MODULE_ALIAS("platform:amiga-a3000-scsi");