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 static int jazz_esp_release(struct Scsi_Host *shost)
58 free_irq(shost->irq, NULL);
59 if (shost->dma_channel != 0xff)
60 free_dma(shost->dma_channel);
61 if (shost->io_port && shost->n_io_port)
62 release_region(shost->io_port, shost->n_io_port);
63 scsi_unregister(shost);
67 static struct scsi_host_template driver_template = {
68 .proc_name = "jazz_esp",
69 .proc_info = &esp_proc_info,
70 .name = "ESP 100/100a/200",
71 .detect = jazz_esp_detect,
72 .slave_alloc = esp_slave_alloc,
73 .slave_destroy = esp_slave_destroy,
74 .release = jazz_esp_release,
76 .queuecommand = esp_queue,
77 .eh_abort_handler = esp_abort,
78 .eh_bus_reset_handler = esp_reset,
81 .sg_tablesize = SG_ALL,
83 .use_clustering = DISABLE_CLUSTERING,
86 #include "scsi_module.c"
88 /***************************************************************** Detection */
89 static int jazz_esp_detect(struct scsi_host_template *tpnt)
92 struct ConfigDev *esp_dev;
95 * first assumption it is there:-)
99 esp = esp_allocate(tpnt, (void *) esp_dev);
101 /* Do command transfer with programmed I/O */
102 esp->do_pio_cmds = 1;
104 /* Required functions */
105 esp->dma_bytes_sent = &dma_bytes_sent;
106 esp->dma_can_transfer = &dma_can_transfer;
107 esp->dma_dump_state = &dma_dump_state;
108 esp->dma_init_read = &dma_init_read;
109 esp->dma_init_write = &dma_init_write;
110 esp->dma_ints_off = &dma_ints_off;
111 esp->dma_ints_on = &dma_ints_on;
112 esp->dma_irq_p = &dma_irq_p;
113 esp->dma_ports_p = &dma_ports_p;
114 esp->dma_setup = &dma_setup;
116 /* Optional functions */
117 esp->dma_barrier = NULL;
118 esp->dma_drain = NULL;
119 esp->dma_invalidate = NULL;
120 esp->dma_irq_entry = NULL;
121 esp->dma_irq_exit = NULL;
122 esp->dma_poll = NULL;
123 esp->dma_reset = NULL;
124 esp->dma_led_off = &dma_led_off;
125 esp->dma_led_on = &dma_led_on;
127 /* virtual DMA functions */
128 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
129 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
130 esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
131 esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
132 esp->dma_advance_sg = &dma_advance_sg;
135 /* SCSI chip speed */
136 esp->cfreq = 40000000;
139 * we don't give the address of DMA channel, but the number
140 * of DMA channel, so we can use the jazz DMA functions
143 esp->dregs = (void *) JAZZ_SCSI_DMA;
145 /* ESP register base */
146 esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
148 /* Set the command buffer */
149 esp->esp_command = (volatile unsigned char *)cmd_buffer;
151 /* get virtual dma address for command buffer */
152 esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
154 esp->irq = JAZZ_SCSI_IRQ;
155 request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
159 * FIXME, look if the scsi id is available from NVRAM
163 /* Check for differential SCSI-bus */
164 /* What is this stuff? */
169 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
170 esps_running = esps_in_use;
176 /************************************************************* DMA Functions */
177 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
182 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
185 * maximum DMA size is 1MB
187 unsigned long sz = sp->SCp.this_residual;
193 static void dma_dump_state(struct NCR_ESP *esp)
196 ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
197 esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
200 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
202 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
203 vdma_disable ((int)esp->dregs);
204 vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
205 vdma_set_addr ((int)esp->dregs, vaddress);
206 vdma_set_count ((int)esp->dregs, length);
207 vdma_enable ((int)esp->dregs);
210 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
212 dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
213 vdma_disable ((int)esp->dregs);
214 vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
215 vdma_set_addr ((int)esp->dregs, vaddress);
216 vdma_set_count ((int)esp->dregs, length);
217 vdma_enable ((int)esp->dregs);
220 static void dma_ints_off(struct NCR_ESP *esp)
222 disable_irq(esp->irq);
225 static void dma_ints_on(struct NCR_ESP *esp)
227 enable_irq(esp->irq);
230 static int dma_irq_p(struct NCR_ESP *esp)
232 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
235 static int dma_ports_p(struct NCR_ESP *esp)
237 int enable = vdma_get_enable((int)esp->dregs);
239 return (enable & R4030_CHNL_ENABLE);
242 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
245 * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
246 * so when (write) is true, it actually means READ!
249 dma_init_read(esp, addr, count);
251 dma_init_write(esp, addr, count);
255 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
257 sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
258 sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
261 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
263 int sz = sp->SCp.buffers_residual;
264 struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
267 sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
270 sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
273 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
275 vdma_free(sp->SCp.have_data_in);
278 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
280 int sz = sp->use_sg - 1;
281 struct scatterlist *sg = (struct scatterlist *)sp->buffer;
284 vdma_free(sg[sz].dma_address);
289 static void dma_advance_sg (struct scsi_cmnd *sp)
291 sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
294 #define JAZZ_HDC_LED 0xe000d100 /* FIXME, find correct address */
296 static void dma_led_off(struct NCR_ESP *esp)
299 *(unsigned char *)JAZZ_HDC_LED = 0;
303 static void dma_led_on(struct NCR_ESP *esp)
306 *(unsigned char *)JAZZ_HDC_LED = 1;
310 static struct scsi_host_template driver_template = {
311 .proc_name = "jazz_esp",
312 .proc_info = esp_proc_info,
313 .name = "ESP 100/100a/200",
314 .detect = jazz_esp_detect,
315 .slave_alloc = esp_slave_alloc,
316 .slave_destroy = esp_slave_destroy,
317 .release = jazz_esp_release,
319 .queuecommand = esp_queue,
320 .eh_abort_handler = esp_abort,
321 .eh_bus_reset_handler = esp_reset,
324 .sg_tablesize = SG_ALL,
326 .use_clustering = DISABLE_CLUSTERING,
328 #include "scsi_module.c"