File: /usr/src/linux/drivers/scsi/cyberstormII.c
1 /* cyberstormII.c: Driver for CyberStorm SCSI Mk II
2 *
3 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
4 *
5 * This driver is based on cyberstorm.c
6 */
7
8 /* TODO:
9 *
10 * 1) Figure out how to make a cleaner merge with the sparc driver with regard
11 * to the caches and the Sparc MMU mapping.
12 * 2) Make as few routines required outside the generic driver. A lot of the
13 * routines in this file used to be inline!
14 */
15
16 #include <linux/module.h>
17
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/blk.h>
25 #include <linux/proc_fs.h>
26 #include <linux/stat.h>
27
28 #include "scsi.h"
29 #include "hosts.h"
30 #include "NCR53C9x.h"
31 #include "cyberstormII.h"
32
33 #include <linux/zorro.h>
34 #include <asm/irq.h>
35 #include <asm/amigaints.h>
36 #include <asm/amigahw.h>
37
38 #include <asm/pgtable.h>
39
40 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
41 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
42 static void dma_dump_state(struct NCR_ESP *esp);
43 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
44 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
45 static void dma_ints_off(struct NCR_ESP *esp);
46 static void dma_ints_on(struct NCR_ESP *esp);
47 static int dma_irq_p(struct NCR_ESP *esp);
48 static void dma_led_off(struct NCR_ESP *esp);
49 static void dma_led_on(struct NCR_ESP *esp);
50 static int dma_ports_p(struct NCR_ESP *esp);
51 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
52
53 volatile unsigned char cmd_buffer[16];
54 /* This is where all commands are put
55 * before they are transferred to the ESP chip
56 * via PIO.
57 */
58
59 /***************************************************************** Detection */
60 int __init cyberII_esp_detect(Scsi_Host_Template *tpnt)
61 {
62 struct NCR_ESP *esp;
63 struct zorro_dev *z = NULL;
64 unsigned long address;
65 struct ESP_regs *eregs;
66
67 if ((z = zorro_find_device(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, z))) {
68 unsigned long board = z->resource.start;
69 if (request_mem_region(board+CYBERII_ESP_ADDR,
70 sizeof(struct ESP_regs), "NCR53C9x")) {
71 /* Do some magic to figure out if the CyberStorm Mk II
72 * is equipped with a SCSI controller
73 */
74 address = (unsigned long)ZTWO_VADDR(board);
75 eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);
76
77 esp = esp_allocate(tpnt, (void *)board+CYBERII_ESP_ADDR);
78
79 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
80 udelay(5);
81 if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7)) {
82 esp_deallocate(esp);
83 scsi_unregister(esp->ehost);
84 release_mem_region(board+CYBERII_ESP_ADDR,
85 sizeof(struct ESP_regs));
86 return 0; /* Bail out if address did not hold data */
87 }
88
89 /* Do command transfer with programmed I/O */
90 esp->do_pio_cmds = 1;
91
92 /* Required functions */
93 esp->dma_bytes_sent = &dma_bytes_sent;
94 esp->dma_can_transfer = &dma_can_transfer;
95 esp->dma_dump_state = &dma_dump_state;
96 esp->dma_init_read = &dma_init_read;
97 esp->dma_init_write = &dma_init_write;
98 esp->dma_ints_off = &dma_ints_off;
99 esp->dma_ints_on = &dma_ints_on;
100 esp->dma_irq_p = &dma_irq_p;
101 esp->dma_ports_p = &dma_ports_p;
102 esp->dma_setup = &dma_setup;
103
104 /* Optional functions */
105 esp->dma_barrier = 0;
106 esp->dma_drain = 0;
107 esp->dma_invalidate = 0;
108 esp->dma_irq_entry = 0;
109 esp->dma_irq_exit = 0;
110 esp->dma_led_on = &dma_led_on;
111 esp->dma_led_off = &dma_led_off;
112 esp->dma_poll = 0;
113 esp->dma_reset = 0;
114
115 /* SCSI chip speed */
116 esp->cfreq = 40000000;
117
118 /* The DMA registers on the CyberStorm are mapped
119 * relative to the device (i.e. in the same Zorro
120 * I/O block).
121 */
122 esp->dregs = (void *)(address + CYBERII_DMA_ADDR);
123
124 /* ESP register base */
125 esp->eregs = eregs;
126
127 /* Set the command buffer */
128 esp->esp_command = (volatile unsigned char*) cmd_buffer;
129 esp->esp_command_dvma = virt_to_bus(cmd_buffer);
130
131 esp->irq = IRQ_AMIGA_PORTS;
132 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
133 "CyberStorm SCSI Mk II", esp_intr);
134
135 /* Figure out our scsi ID on the bus */
136 esp->scsi_id = 7;
137
138 /* We don't have a differential SCSI-bus. */
139 esp->diff = 0;
140
141 esp_initialize(esp);
142
143 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
144 esps_running = esps_in_use;
145 return esps_in_use;
146 }
147 }
148 return 0;
149 }
150
151 /************************************************************* DMA Functions */
152 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
153 {
154 /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
155 * the number of bytes sent (to the ESP chip) equals the number
156 * of bytes in the FIFO - there is no buffering in the DMA controller.
157 * XXXX Do I read this right? It is from host to ESP, right?
158 */
159 return fifo_count;
160 }
161
162 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
163 {
164 /* I don't think there's any limit on the CyberDMA. So we use what
165 * the ESP chip can handle (24 bit).
166 */
167 unsigned long sz = sp->SCp.this_residual;
168 if(sz > 0x1000000)
169 sz = 0x1000000;
170 return sz;
171 }
172
173 static void dma_dump_state(struct NCR_ESP *esp)
174 {
175 ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
176 esp->esp_id, ((struct cyberII_dma_registers *)
177 (esp->dregs))->cond_reg));
178 ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
179 custom.intreqr, custom.intenar));
180 }
181
182 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
183 {
184 struct cyberII_dma_registers *dregs =
185 (struct cyberII_dma_registers *) esp->dregs;
186
187 cache_clear(addr, length);
188
189 addr &= ~(1);
190 dregs->dma_addr0 = (addr >> 24) & 0xff;
191 dregs->dma_addr1 = (addr >> 16) & 0xff;
192 dregs->dma_addr2 = (addr >> 8) & 0xff;
193 dregs->dma_addr3 = (addr ) & 0xff;
194 }
195
196 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
197 {
198 struct cyberII_dma_registers *dregs =
199 (struct cyberII_dma_registers *) esp->dregs;
200
201 cache_push(addr, length);
202
203 addr |= 1;
204 dregs->dma_addr0 = (addr >> 24) & 0xff;
205 dregs->dma_addr1 = (addr >> 16) & 0xff;
206 dregs->dma_addr2 = (addr >> 8) & 0xff;
207 dregs->dma_addr3 = (addr ) & 0xff;
208 }
209
210 static void dma_ints_off(struct NCR_ESP *esp)
211 {
212 disable_irq(esp->irq);
213 }
214
215 static void dma_ints_on(struct NCR_ESP *esp)
216 {
217 enable_irq(esp->irq);
218 }
219
220 static int dma_irq_p(struct NCR_ESP *esp)
221 {
222 /* It's important to check the DMA IRQ bit in the correct way! */
223 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
224 }
225
226 static void dma_led_off(struct NCR_ESP *esp)
227 {
228 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
229 }
230
231 static void dma_led_on(struct NCR_ESP *esp)
232 {
233 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
234 }
235
236 static int dma_ports_p(struct NCR_ESP *esp)
237 {
238 return ((custom.intenar) & IF_PORTS);
239 }
240
241 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
242 {
243 /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
244 * so when (write) is true, it actually means READ!
245 */
246 if(write){
247 dma_init_read(esp, addr, count);
248 } else {
249 dma_init_write(esp, addr, count);
250 }
251 }
252
253 #define HOSTS_C
254
255 #include "cyberstormII.h"
256
257 static Scsi_Host_Template driver_template = SCSI_CYBERSTORMII;
258
259 #include "scsi_module.c"
260
261
262 int cyberII_esp_release(struct Scsi_Host *instance)
263 {
264 #ifdef MODULE
265 unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
266
267 esp_deallocate((struct NCR_ESP *)instance->hostdata);
268 esp_release();
269 release_mem_region(address, sizeof(struct ESP_regs));
270 free_irq(IRQ_AMIGA_PORTS, esp_intr);
271 #endif
272 return 1;
273 }
274