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/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>
20 #include <scsi/scsi_host.h>
25 #include <asm/jazzdma.h>
28 #include <asm/pgtable.h>
30 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
31 static int dma_can_transfer(struct NCR_ESP *esp, struct 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, struct scsi_cmnd *sp);
41 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
42 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
43 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
44 static void dma_advance_sg (struct scsi_cmnd *sp);
45 static void dma_led_off(struct NCR_ESP *);
46 static void dma_led_on(struct NCR_ESP *);
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
55 int jazz_esp_detect(struct scsi_host_template *tpnt);
56 static int jazz_esp_release(struct Scsi_Host *shost)
59 free_irq(shost->irq, NULL);
60 if (shost->dma_channel != 0xff)
61 free_dma(shost->dma_channel);
62 if (shost->io_port && shost->n_io_port)
63 release_region(shost->io_port, shost->n_io_port);
64 scsi_unregister(shost);
68 /***************************************************************** Detection */
69 static int jazz_esp_detect(struct scsi_host_template *tpnt)
72 struct ConfigDev *esp_dev;
75 * first assumption it is there:-)
79 esp = esp_allocate(tpnt, (void *) esp_dev);
81 /* Do command transfer with programmed I/O */
84 /* Required functions */
85 esp->dma_bytes_sent = &dma_bytes_sent;
86 esp->dma_can_transfer = &dma_can_transfer;
87 esp->dma_dump_state = &dma_dump_state;
88 esp->dma_init_read = &dma_init_read;
89 esp->dma_init_write = &dma_init_write;
90 esp->dma_ints_off = &dma_ints_off;
91 esp->dma_ints_on = &dma_ints_on;
92 esp->dma_irq_p = &dma_irq_p;
93 esp->dma_ports_p = &dma_ports_p;
94 esp->dma_setup = &dma_setup;
96 /* Optional functions */
99 esp->dma_invalidate = 0;
100 esp->dma_irq_entry = 0;
101 esp->dma_irq_exit = 0;
104 esp->dma_led_off = &dma_led_off;
105 esp->dma_led_on = &dma_led_on;
107 /* virtual DMA functions */
108 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
109 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
110 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
111 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
112 esp->dma_advance_sg = &dma_advance_sg;
115 /* SCSI chip speed */
116 esp->cfreq = 40000000;
119 * we don't give the address of DMA channel, but the number
120 * of DMA channel, so we can use the jazz DMA functions
123 esp->dregs = JAZZ_SCSI_DMA;
125 /* ESP register base */
126 esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
128 /* Set the command buffer */
129 esp->esp_command = (volatile unsigned char *)cmd_buffer;
131 /* get virtual dma address for command buffer */
132 esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
134 esp->irq = JAZZ_SCSI_IRQ;
135 request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
139 * FIXME, look if the scsi id is available from NVRAM
143 /* Check for differential SCSI-bus */
144 /* What is this stuff? */
149 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
150 esps_running = esps_in_use;
156 /************************************************************* DMA Functions */
157 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
162 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
165 * maximum DMA size is 1MB
167 unsigned long sz = sp->SCp.this_residual;
173 static void dma_dump_state(struct NCR_ESP *esp)
176 ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
177 esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
180 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
182 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
183 vdma_disable ((int)esp->dregs);
184 vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
185 vdma_set_addr ((int)esp->dregs, vaddress);
186 vdma_set_count ((int)esp->dregs, length);
187 vdma_enable ((int)esp->dregs);
190 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
192 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
193 vdma_disable ((int)esp->dregs);
194 vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
195 vdma_set_addr ((int)esp->dregs, vaddress);
196 vdma_set_count ((int)esp->dregs, length);
197 vdma_enable ((int)esp->dregs);
200 static void dma_ints_off(struct NCR_ESP *esp)
202 disable_irq(esp->irq);
205 static void dma_ints_on(struct NCR_ESP *esp)
207 enable_irq(esp->irq);
210 static int dma_irq_p(struct NCR_ESP *esp)
212 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
215 static int dma_ports_p(struct NCR_ESP *esp)
217 int enable = vdma_get_enable((int)esp->dregs);
219 return (enable & R4030_CHNL_ENABLE);
222 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
225 * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
226 * so when (write) is true, it actually means READ!
229 dma_init_read(esp, addr, count);
231 dma_init_write(esp, addr, count);
235 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
237 sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
238 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
241 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
243 int sz = sp->SCp.buffers_residual;
244 struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
247 sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
250 sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
253 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
255 vdma_free(sp->SCp.have_data_in);
258 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
260 int sz = sp->use_sg - 1;
261 struct scatterlist *sg = (struct scatterlist *)sp->buffer;
264 vdma_free(sg[sz].dma_address);
269 static void dma_advance_sg (struct scsi_cmnd *sp)
271 sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
274 #define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
276 static void dma_led_off(struct NCR_ESP *esp)
279 *(unsigned char *)JAZZ_HDC_LED = 0;
283 static void dma_led_on(struct NCR_ESP *esp)
286 *(unsigned char *)JAZZ_HDC_LED = 1;
290 static struct scsi_host_template driver_template = {
291 .proc_name = "jazz_esp",
292 .proc_info = esp_proc_info,
293 .name = "ESP 100/100a/200",
294 .detect = jazz_esp_detect,
295 .slave_alloc = esp_slave_alloc,
296 .slave_destroy = esp_slave_destroy,
297 .release = jazz_esp_release,
299 .queuecommand = esp_queue,
300 .eh_abort_handler = esp_abort,
301 .eh_bus_reset_handler = esp_reset,
304 .sg_tablesize = SG_ALL,
306 .use_clustering = DISABLE_CLUSTERING,
308 #include "scsi_module.c"