1 |
1275 |
phoenix |
/*
|
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/kernel.h>
|
10 |
|
|
#include <linux/delay.h>
|
11 |
|
|
#include <linux/types.h>
|
12 |
|
|
#include <linux/string.h>
|
13 |
|
|
#include <linux/slab.h>
|
14 |
|
|
#include <linux/blk.h>
|
15 |
|
|
#include <linux/proc_fs.h>
|
16 |
|
|
#include <linux/stat.h>
|
17 |
|
|
|
18 |
|
|
#include "scsi.h"
|
19 |
|
|
#include "hosts.h"
|
20 |
|
|
#include "NCR53C9x.h"
|
21 |
|
|
#include "jazz_esp.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 |
|
|
|
30 |
|
|
static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
|
31 |
|
|
static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
|
32 |
|
|
static void dma_dump_state(struct NCR_ESP *esp);
|
33 |
|
|
static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
|
34 |
|
|
static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
|
35 |
|
|
static void dma_ints_off(struct NCR_ESP *esp);
|
36 |
|
|
static void dma_ints_on(struct NCR_ESP *esp);
|
37 |
|
|
static int dma_irq_p(struct NCR_ESP *esp);
|
38 |
|
|
static int dma_ports_p(struct NCR_ESP *esp);
|
39 |
|
|
static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
|
40 |
|
|
static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
|
41 |
|
|
static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
|
42 |
|
|
static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
|
43 |
|
|
static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
|
44 |
|
|
static void dma_advance_sg (Scsi_Cmnd *sp);
|
45 |
|
|
static void dma_led_off(struct NCR_ESP *);
|
46 |
|
|
static void dma_led_on(struct NCR_ESP *);
|
47 |
|
|
|
48 |
|
|
|
49 |
|
|
static 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 |
|
|
|
55 |
|
|
/***************************************************************** Detection */
|
56 |
|
|
int jazz_esp_detect(Scsi_Host_Template *tpnt)
|
57 |
|
|
{
|
58 |
|
|
struct NCR_ESP *esp;
|
59 |
|
|
struct ConfigDev *esp_dev;
|
60 |
|
|
|
61 |
|
|
/*
|
62 |
|
|
* first assumption it is there:-)
|
63 |
|
|
*/
|
64 |
|
|
if (1) {
|
65 |
|
|
esp_dev = 0;
|
66 |
|
|
esp = esp_allocate(tpnt, (void *) esp_dev);
|
67 |
|
|
|
68 |
|
|
/* Do command transfer with programmed I/O */
|
69 |
|
|
esp->do_pio_cmds = 1;
|
70 |
|
|
|
71 |
|
|
/* Required functions */
|
72 |
|
|
esp->dma_bytes_sent = &dma_bytes_sent;
|
73 |
|
|
esp->dma_can_transfer = &dma_can_transfer;
|
74 |
|
|
esp->dma_dump_state = &dma_dump_state;
|
75 |
|
|
esp->dma_init_read = &dma_init_read;
|
76 |
|
|
esp->dma_init_write = &dma_init_write;
|
77 |
|
|
esp->dma_ints_off = &dma_ints_off;
|
78 |
|
|
esp->dma_ints_on = &dma_ints_on;
|
79 |
|
|
esp->dma_irq_p = &dma_irq_p;
|
80 |
|
|
esp->dma_ports_p = &dma_ports_p;
|
81 |
|
|
esp->dma_setup = &dma_setup;
|
82 |
|
|
|
83 |
|
|
/* Optional functions */
|
84 |
|
|
esp->dma_barrier = 0;
|
85 |
|
|
esp->dma_drain = 0;
|
86 |
|
|
esp->dma_invalidate = 0;
|
87 |
|
|
esp->dma_irq_entry = 0;
|
88 |
|
|
esp->dma_irq_exit = 0;
|
89 |
|
|
esp->dma_poll = 0;
|
90 |
|
|
esp->dma_reset = 0;
|
91 |
|
|
esp->dma_led_off = &dma_led_off;
|
92 |
|
|
esp->dma_led_on = &dma_led_on;
|
93 |
|
|
|
94 |
|
|
/* virtual DMA functions */
|
95 |
|
|
esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
|
96 |
|
|
esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
|
97 |
|
|
esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
|
98 |
|
|
esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
|
99 |
|
|
esp->dma_advance_sg = &dma_advance_sg;
|
100 |
|
|
|
101 |
|
|
|
102 |
|
|
/* SCSI chip speed */
|
103 |
|
|
esp->cfreq = 40000000;
|
104 |
|
|
|
105 |
|
|
/*
|
106 |
|
|
* we don't give the address of DMA channel, but the number
|
107 |
|
|
* of DMA channel, so we can use the jazz DMA functions
|
108 |
|
|
*
|
109 |
|
|
*/
|
110 |
|
|
esp->dregs = JAZZ_SCSI_DMA;
|
111 |
|
|
|
112 |
|
|
/* ESP register base */
|
113 |
|
|
esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
|
114 |
|
|
|
115 |
|
|
/* Set the command buffer */
|
116 |
|
|
esp->esp_command = (volatile unsigned char *)cmd_buffer;
|
117 |
|
|
|
118 |
|
|
/* get virtual dma address for command buffer */
|
119 |
|
|
esp->esp_command_dvma = vdma_alloc(PHYSADDR(cmd_buffer), sizeof (cmd_buffer));
|
120 |
|
|
|
121 |
|
|
esp->irq = JAZZ_SCSI_IRQ;
|
122 |
|
|
request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
|
123 |
|
|
NULL);
|
124 |
|
|
|
125 |
|
|
/*
|
126 |
|
|
* FIXME, look if the scsi id is available from NVRAM
|
127 |
|
|
*/
|
128 |
|
|
esp->scsi_id = 7;
|
129 |
|
|
|
130 |
|
|
/* Check for differential SCSI-bus */
|
131 |
|
|
/* What is this stuff? */
|
132 |
|
|
esp->diff = 0;
|
133 |
|
|
|
134 |
|
|
esp_initialize(esp);
|
135 |
|
|
|
136 |
|
|
printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
|
137 |
|
|
esps_running = esps_in_use;
|
138 |
|
|
return esps_in_use;
|
139 |
|
|
}
|
140 |
|
|
return 0;
|
141 |
|
|
}
|
142 |
|
|
|
143 |
|
|
/************************************************************* DMA Functions */
|
144 |
|
|
static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
|
145 |
|
|
{
|
146 |
|
|
return fifo_count;
|
147 |
|
|
}
|
148 |
|
|
|
149 |
|
|
static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
|
150 |
|
|
{
|
151 |
|
|
/*
|
152 |
|
|
* maximum DMA size is 1MB
|
153 |
|
|
*/
|
154 |
|
|
unsigned long sz = sp->SCp.this_residual;
|
155 |
|
|
if(sz > 0x100000)
|
156 |
|
|
sz = 0x100000;
|
157 |
|
|
return sz;
|
158 |
|
|
}
|
159 |
|
|
|
160 |
|
|
static void dma_dump_state(struct NCR_ESP *esp)
|
161 |
|
|
{
|
162 |
|
|
|
163 |
|
|
ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
|
164 |
|
|
esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
|
165 |
|
|
}
|
166 |
|
|
|
167 |
|
|
static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
|
168 |
|
|
{
|
169 |
|
|
dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
|
170 |
|
|
vdma_disable ((int)esp->dregs);
|
171 |
|
|
vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
|
172 |
|
|
vdma_set_addr ((int)esp->dregs, vaddress);
|
173 |
|
|
vdma_set_count ((int)esp->dregs, length);
|
174 |
|
|
vdma_enable ((int)esp->dregs);
|
175 |
|
|
}
|
176 |
|
|
|
177 |
|
|
static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
|
178 |
|
|
{
|
179 |
|
|
dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
|
180 |
|
|
vdma_disable ((int)esp->dregs);
|
181 |
|
|
vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
|
182 |
|
|
vdma_set_addr ((int)esp->dregs, vaddress);
|
183 |
|
|
vdma_set_count ((int)esp->dregs, length);
|
184 |
|
|
vdma_enable ((int)esp->dregs);
|
185 |
|
|
}
|
186 |
|
|
|
187 |
|
|
static void dma_ints_off(struct NCR_ESP *esp)
|
188 |
|
|
{
|
189 |
|
|
disable_irq(esp->irq);
|
190 |
|
|
}
|
191 |
|
|
|
192 |
|
|
static void dma_ints_on(struct NCR_ESP *esp)
|
193 |
|
|
{
|
194 |
|
|
enable_irq(esp->irq);
|
195 |
|
|
}
|
196 |
|
|
|
197 |
|
|
static int dma_irq_p(struct NCR_ESP *esp)
|
198 |
|
|
{
|
199 |
|
|
return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
|
200 |
|
|
}
|
201 |
|
|
|
202 |
|
|
static int dma_ports_p(struct NCR_ESP *esp)
|
203 |
|
|
{
|
204 |
|
|
int enable = vdma_get_enable((int)esp->dregs);
|
205 |
|
|
|
206 |
|
|
return (enable & R4030_CHNL_ENABLE);
|
207 |
|
|
}
|
208 |
|
|
|
209 |
|
|
static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
|
210 |
|
|
{
|
211 |
|
|
/*
|
212 |
|
|
* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
|
213 |
|
|
* so when (write) is true, it actually means READ!
|
214 |
|
|
*/
|
215 |
|
|
if(write){
|
216 |
|
|
dma_init_read(esp, addr, count);
|
217 |
|
|
} else {
|
218 |
|
|
dma_init_write(esp, addr, count);
|
219 |
|
|
}
|
220 |
|
|
}
|
221 |
|
|
|
222 |
|
|
static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
|
223 |
|
|
{
|
224 |
|
|
sp->SCp.have_data_in = vdma_alloc(PHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
|
225 |
|
|
sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
|
226 |
|
|
}
|
227 |
|
|
|
228 |
|
|
static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
|
229 |
|
|
{
|
230 |
|
|
int sz = sp->SCp.buffers_residual;
|
231 |
|
|
struct mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
|
232 |
|
|
|
233 |
|
|
while (sz >= 0) {
|
234 |
|
|
sg[sz].dvma_addr = vdma_alloc(PHYSADDR(sg[sz].addr), sg[sz].len);
|
235 |
|
|
sz--;
|
236 |
|
|
}
|
237 |
|
|
sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
|
238 |
|
|
}
|
239 |
|
|
|
240 |
|
|
static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
|
241 |
|
|
{
|
242 |
|
|
vdma_free(sp->SCp.have_data_in);
|
243 |
|
|
}
|
244 |
|
|
|
245 |
|
|
static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
|
246 |
|
|
{
|
247 |
|
|
int sz = sp->use_sg - 1;
|
248 |
|
|
struct mmu_sglist *sg = (struct mmu_sglist *)sp->buffer;
|
249 |
|
|
|
250 |
|
|
while(sz >= 0) {
|
251 |
|
|
vdma_free(sg[sz].dvma_addr);
|
252 |
|
|
sz--;
|
253 |
|
|
}
|
254 |
|
|
}
|
255 |
|
|
|
256 |
|
|
static void dma_advance_sg (Scsi_Cmnd *sp)
|
257 |
|
|
{
|
258 |
|
|
sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
|
259 |
|
|
}
|
260 |
|
|
|
261 |
|
|
#define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
|
262 |
|
|
|
263 |
|
|
static void dma_led_off(struct NCR_ESP *esp)
|
264 |
|
|
{
|
265 |
|
|
#if 0
|
266 |
|
|
*(unsigned char *)JAZZ_HDC_LED = 0;
|
267 |
|
|
#endif
|
268 |
|
|
}
|
269 |
|
|
|
270 |
|
|
static void dma_led_on(struct NCR_ESP *esp)
|
271 |
|
|
{
|
272 |
|
|
#if 0
|
273 |
|
|
*(unsigned char *)JAZZ_HDC_LED = 1;
|
274 |
|
|
#endif
|
275 |
|
|
}
|