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[SCSI] drivers/scsi: Use ARRAY_SIZE macro
[linux-block.git] / drivers / scsi / jazz_esp.c
CommitLineData
1da177e4
LT		 1/*
2 * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
3 *
4 * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
5 *
6 * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
7 */
8
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/delay.h>
12#include <linux/types.h>
13#include <linux/string.h>
14#include <linux/slab.h>
15#include <linux/blkdev.h>
16#include <linux/proc_fs.h>
17#include <linux/stat.h>
18
19#include "scsi.h"
20#include <scsi/scsi_host.h>
21#include "NCR53C9x.h"
22
23#include <asm/irq.h>
24#include <asm/jazz.h>
25#include <asm/jazzdma.h>
26#include <asm/dma.h>
27
28#include <asm/pgtable.h>
29
30static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
31static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
32static void dma_dump_state(struct NCR_ESP *esp);
33static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
34static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
35static void dma_ints_off(struct NCR_ESP *esp);
36static void dma_ints_on(struct NCR_ESP *esp);
37static int dma_irq_p(struct NCR_ESP *esp);
38static int dma_ports_p(struct NCR_ESP *esp);
39static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
40static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
41static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
42static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
43static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
44static void dma_advance_sg (struct scsi_cmnd *sp);
45static void dma_led_off(struct NCR_ESP *);
46static void dma_led_on(struct NCR_ESP *);
47
48
49static volatile unsigned char cmd_buffer[16];
50 /* This is where all commands are put
51 * before they are trasfered to the ESP chip
52 * via PIO.
53 */
54
1da177e4
LT		 55static int jazz_esp_release(struct Scsi_Host *shost)
56{
57 if (shost->irq)
58 free_irq(shost->irq, NULL);
59 if (shost->dma_channel != 0xff)
60 free_dma(shost->dma_channel);
61 if (shost->io_port && shost->n_io_port)
62 release_region(shost->io_port, shost->n_io_port);
63 scsi_unregister(shost);
64 return 0;
65}
66
1da177e4
LT		 67/***************************************************************** Detection */
68static int jazz_esp_detect(struct scsi_host_template *tpnt)
69{
70 struct NCR_ESP *esp;
71 struct ConfigDev *esp_dev;
72
73 /*
74 * first assumption it is there:-)
75 */
76 if (1) {
ae198df3 77 esp_dev = NULL;
1da177e4
LT		 78 esp = esp_allocate(tpnt, (void *) esp_dev);
79
80 /* Do command transfer with programmed I/O */
81 esp->do_pio_cmds = 1;
82
83 /* Required functions */
84 esp->dma_bytes_sent = &dma_bytes_sent;
85 esp->dma_can_transfer = &dma_can_transfer;
86 esp->dma_dump_state = &dma_dump_state;
87 esp->dma_init_read = &dma_init_read;
88 esp->dma_init_write = &dma_init_write;
89 esp->dma_ints_off = &dma_ints_off;
90 esp->dma_ints_on = &dma_ints_on;
91 esp->dma_irq_p = &dma_irq_p;
92 esp->dma_ports_p = &dma_ports_p;
93 esp->dma_setup = &dma_setup;
94
95 /* Optional functions */
ae198df3
RB		 96 esp->dma_barrier = NULL;
97 esp->dma_drain = NULL;
98 esp->dma_invalidate = NULL;
99 esp->dma_irq_entry = NULL;
100 esp->dma_irq_exit = NULL;
101 esp->dma_poll = NULL;
102 esp->dma_reset = NULL;
1da177e4
LT		 103 esp->dma_led_off = &dma_led_off;
104 esp->dma_led_on = &dma_led_on;
105
106 /* virtual DMA functions */
107 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
108 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
109 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
110 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
111 esp->dma_advance_sg = &dma_advance_sg;
112
113
114 /* SCSI chip speed */
115 esp->cfreq = 40000000;
116
117 /*
118 * we don't give the address of DMA channel, but the number
119 * of DMA channel, so we can use the jazz DMA functions
120 *
121 */
ae198df3 122 esp->dregs = (void *) JAZZ_SCSI_DMA;
1da177e4
LT		 123
124 /* ESP register base */
125 esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
126
127 /* Set the command buffer */
128 esp->esp_command = (volatile unsigned char *)cmd_buffer;
129
130 /* get virtual dma address for command buffer */
131 esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
132
133 esp->irq = JAZZ_SCSI_IRQ;
134 request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
135 esp->ehost);
136
137 /*
138 * FIXME, look if the scsi id is available from NVRAM
139 */
140 esp->scsi_id = 7;
141
142 /* Check for differential SCSI-bus */
143 /* What is this stuff? */
144 esp->diff = 0;
145
146 esp_initialize(esp);
147
148 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
149 esps_running = esps_in_use;
150 return esps_in_use;
151 }
152 return 0;
153}
154
155/************************************************************* DMA Functions */
156static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
157{
158 return fifo_count;
159}
160
161static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
162{
163 /*
164 * maximum DMA size is 1MB
165 */
166 unsigned long sz = sp->SCp.this_residual;
167 if(sz > 0x100000)
168 sz = 0x100000;
169 return sz;
170}
171
172static void dma_dump_state(struct NCR_ESP *esp)
173{
174
175 ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
176 esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
177}
178
179static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
180{
181 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
182 vdma_disable ((int)esp->dregs);
183 vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
184 vdma_set_addr ((int)esp->dregs, vaddress);
185 vdma_set_count ((int)esp->dregs, length);
186 vdma_enable ((int)esp->dregs);
187}
188
189static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
190{
191 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
192 vdma_disable ((int)esp->dregs);
193 vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
194 vdma_set_addr ((int)esp->dregs, vaddress);
195 vdma_set_count ((int)esp->dregs, length);
196 vdma_enable ((int)esp->dregs);
197}
198
199static void dma_ints_off(struct NCR_ESP *esp)
200{
201 disable_irq(esp->irq);
202}
203
204static void dma_ints_on(struct NCR_ESP *esp)
205{
206 enable_irq(esp->irq);
207}
208
209static int dma_irq_p(struct NCR_ESP *esp)
210{
211 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
212}
213
214static int dma_ports_p(struct NCR_ESP *esp)
215{
216 int enable = vdma_get_enable((int)esp->dregs);
217
218 return (enable & R4030_CHNL_ENABLE);
219}
220
221static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
222{
223 /*
224 * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
225 * so when (write) is true, it actually means READ!
226 */
227 if(write){
228 dma_init_read(esp, addr, count);
229 } else {
230 dma_init_write(esp, addr, count);
231 }
232}
233
234static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
235{
236 sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
237 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
238}
239
240static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
241{
242 int sz = sp->SCp.buffers_residual;
243 struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
244
245 while (sz >= 0) {
246 sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
247 sz--;
248 }
249 sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
250}
251
252static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
253{
254 vdma_free(sp->SCp.have_data_in);
255}
256
257static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
258{
259 int sz = sp->use_sg - 1;
260 struct scatterlist *sg = (struct scatterlist *)sp->buffer;
261
262 while(sz >= 0) {
263 vdma_free(sg[sz].dma_address);
264 sz--;
265 }
266}
267
268static void dma_advance_sg (struct scsi_cmnd *sp)
269{
270 sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
271}
272
273#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
274
275static void dma_led_off(struct NCR_ESP *esp)
276{
277#if 0
278 *(unsigned char *)JAZZ_HDC_LED = 0;
279#endif
280}
281
282static void dma_led_on(struct NCR_ESP *esp)
283{
284#if 0
285 *(unsigned char *)JAZZ_HDC_LED = 1;
286#endif
287}
288
289static struct scsi_host_template driver_template = {
290 .proc_name = "jazz_esp",
291 .proc_info = esp_proc_info,
292 .name = "ESP 100/100a/200",
293 .detect = jazz_esp_detect,
294 .slave_alloc = esp_slave_alloc,
295 .slave_destroy = esp_slave_destroy,
296 .release = jazz_esp_release,
297 .info = esp_info,
298 .queuecommand = esp_queue,
299 .eh_abort_handler = esp_abort,
300 .eh_bus_reset_handler = esp_reset,
301 .can_queue = 7,
302 .this_id = 7,
303 .sg_tablesize = SG_ALL,
304 .cmd_per_lun = 1,
305 .use_clustering = DISABLE_CLUSTERING,
306};
307#include "scsi_module.c"
Linux 6.x block layer and io_uring tree(s)