2 * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
4 * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
6 * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
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/blkdev.h>
15 #include <linux/proc_fs.h>
16 #include <linux/stat.h>
24 #include <asm/jazzdma.h>
27 #include <asm/pgtable.h>
29 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
30 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
31 static void dma_dump_state(struct NCR_ESP *esp);
32 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
33 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
34 static void dma_ints_off(struct NCR_ESP *esp);
35 static void dma_ints_on(struct NCR_ESP *esp);
36 static int dma_irq_p(struct NCR_ESP *esp);
37 static int dma_ports_p(struct NCR_ESP *esp);
38 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
39 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
40 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
41 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
42 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
43 static void dma_advance_sg (Scsi_Cmnd *sp);
44 static void dma_led_off(struct NCR_ESP *);
45 static void dma_led_on(struct NCR_ESP *);
48 static volatile unsigned char cmd_buffer[16];
49 /* This is where all commands are put
50 * before they are trasfered to the ESP chip
54 /***************************************************************** Detection */
55 int jazz_esp_detect(Scsi_Host_Template *tpnt)
58 struct ConfigDev *esp_dev;
61 * first assumption it is there:-)
65 esp = esp_allocate(tpnt, (void *) esp_dev);
67 /* Do command transfer with programmed I/O */
70 /* Required functions */
71 esp->dma_bytes_sent = &dma_bytes_sent;
72 esp->dma_can_transfer = &dma_can_transfer;
73 esp->dma_dump_state = &dma_dump_state;
74 esp->dma_init_read = &dma_init_read;
75 esp->dma_init_write = &dma_init_write;
76 esp->dma_ints_off = &dma_ints_off;
77 esp->dma_ints_on = &dma_ints_on;
78 esp->dma_irq_p = &dma_irq_p;
79 esp->dma_ports_p = &dma_ports_p;
80 esp->dma_setup = &dma_setup;
82 /* Optional functions */
85 esp->dma_invalidate = 0;
86 esp->dma_irq_entry = 0;
87 esp->dma_irq_exit = 0;
90 esp->dma_led_off = &dma_led_off;
91 esp->dma_led_on = &dma_led_on;
93 /* virtual DMA functions */
94 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
95 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
96 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
97 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
98 esp->dma_advance_sg = &dma_advance_sg;
101 /* SCSI chip speed */
102 esp->cfreq = 40000000;
105 * we don't give the address of DMA channel, but the number
106 * of DMA channel, so we can use the jazz DMA functions
109 esp->dregs = JAZZ_SCSI_DMA;
111 /* ESP register base */
112 esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
114 /* Set the command buffer */
115 esp->esp_command = (volatile unsigned char *)cmd_buffer;
117 /* get virtual dma address for command buffer */
118 esp->esp_command_dvma = vdma_alloc(PHYSADDR(cmd_buffer), sizeof (cmd_buffer));
120 esp->irq = JAZZ_SCSI_IRQ;
121 request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
125 * FIXME, look if the scsi id is available from NVRAM
129 /* Check for differential SCSI-bus */
130 /* What is this stuff? */
135 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
136 esps_running = esps_in_use;
142 static int jazz_esp_release(struct Scsi_Host *shost)
145 free_irq(shost->irq, NULL);
146 if (shost->dma_channel != 0xff)
147 free_dma(shost->dma_channel);
148 if (shost->io_port && shost->n_io_port)
149 release_region(shost->io_port, shost->n_io_port);
150 scsi_unregister(shost);
154 /************************************************************* DMA Functions */
155 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
160 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
163 * maximum DMA size is 1MB
165 unsigned long sz = sp->SCp.this_residual;
171 static void dma_dump_state(struct NCR_ESP *esp)
174 ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
175 esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
178 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
180 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
181 vdma_disable ((int)esp->dregs);
182 vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
183 vdma_set_addr ((int)esp->dregs, vaddress);
184 vdma_set_count ((int)esp->dregs, length);
185 vdma_enable ((int)esp->dregs);
188 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
190 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
191 vdma_disable ((int)esp->dregs);
192 vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
193 vdma_set_addr ((int)esp->dregs, vaddress);
194 vdma_set_count ((int)esp->dregs, length);
195 vdma_enable ((int)esp->dregs);
198 static void dma_ints_off(struct NCR_ESP *esp)
200 disable_irq(esp->irq);
203 static void dma_ints_on(struct NCR_ESP *esp)
205 enable_irq(esp->irq);
208 static int dma_irq_p(struct NCR_ESP *esp)
210 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
213 static int dma_ports_p(struct NCR_ESP *esp)
215 int enable = vdma_get_enable((int)esp->dregs);
217 return (enable & R4030_CHNL_ENABLE);
220 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
223 * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
224 * so when (write) is true, it actually means READ!
227 dma_init_read(esp, addr, count);
229 dma_init_write(esp, addr, count);
233 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
235 sp->SCp.have_data_in = vdma_alloc(PHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
236 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
239 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
241 int sz = sp->SCp.buffers_residual;
242 struct mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
245 sg[sz].dvma_addr = vdma_alloc(PHYSADDR(sg[sz].addr), sg[sz].len);
248 sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
251 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
253 vdma_free(sp->SCp.have_data_in);
256 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
258 int sz = sp->use_sg - 1;
259 struct mmu_sglist *sg = (struct mmu_sglist *)sp->buffer;
262 vdma_free(sg[sz].dvma_addr);
267 static void dma_advance_sg (Scsi_Cmnd *sp)
269 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
272 #define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
274 static void dma_led_off(struct NCR_ESP *esp)
277 *(unsigned char *)JAZZ_HDC_LED = 0;
281 static void dma_led_on(struct NCR_ESP *esp)
284 *(unsigned char *)JAZZ_HDC_LED = 1;
288 static Scsi_Host_Template driver_template = {
290 .proc_info = &esp_proc_info,
291 .name = "ESP 100/100a/200",
292 .detect = jazz_esp_detect,
293 .slave_alloc = esp_slave_alloc,
294 .slave_destroy = esp_slave_destroy,
295 .release = jazz_esp_release,
297 .queuecommand = esp_queue,
298 .eh_abort_handler = esp_abort,
299 .eh_bus_reset_handler = esp_reset,
302 .sg_tablesize = SG_ALL,
304 .use_clustering = DISABLE_CLUSTERING,