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/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 */
jazz_esp_detect(Scsi_Host_Template * tpnt)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 */
dma_bytes_sent(struct NCR_ESP * esp,int fifo_count)144 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
145 {
146 return fifo_count;
147 }
148
dma_can_transfer(struct NCR_ESP * esp,Scsi_Cmnd * sp)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
dma_dump_state(struct NCR_ESP * esp)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
dma_init_read(struct NCR_ESP * esp,__u32 vaddress,int length)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
dma_init_write(struct NCR_ESP * esp,__u32 vaddress,int length)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
dma_ints_off(struct NCR_ESP * esp)187 static void dma_ints_off(struct NCR_ESP *esp)
188 {
189 disable_irq(esp->irq);
190 }
191
dma_ints_on(struct NCR_ESP * esp)192 static void dma_ints_on(struct NCR_ESP *esp)
193 {
194 enable_irq(esp->irq);
195 }
196
dma_irq_p(struct NCR_ESP * esp)197 static int dma_irq_p(struct NCR_ESP *esp)
198 {
199 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
200 }
201
dma_ports_p(struct NCR_ESP * esp)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
dma_setup(struct NCR_ESP * esp,__u32 addr,int count,int write)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
dma_mmu_get_scsi_one(struct NCR_ESP * esp,Scsi_Cmnd * sp)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
dma_mmu_get_scsi_sgl(struct NCR_ESP * esp,Scsi_Cmnd * sp)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
dma_mmu_release_scsi_one(struct NCR_ESP * esp,Scsi_Cmnd * sp)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
dma_mmu_release_scsi_sgl(struct NCR_ESP * esp,Scsi_Cmnd * sp)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
dma_advance_sg(Scsi_Cmnd * sp)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
dma_led_off(struct NCR_ESP * esp)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
dma_led_on(struct NCR_ESP * esp)270 static void dma_led_on(struct NCR_ESP *esp)
271 {
272 #if 0
273 *(unsigned char *)JAZZ_HDC_LED = 1;
274 #endif
275 }
276