1 /* blz2060.c: Driver for Blizzard 2060 SCSI Controller.
3 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
5 * This driver is based on the CyberStorm driver, hence the occasional
6 * reference to CyberStorm.
11 * 1) Figure out how to make a cleaner merge with the sparc driver with regard
12 * to the caches and the Sparc MMU mapping.
13 * 2) Make as few routines required outside the generic driver. A lot of the
14 * routines in this file used to be inline!
17 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/delay.h>
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/blkdev.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stat.h>
28 #include <linux/interrupt.h>
31 #include <scsi/scsi_host.h>
34 #include <linux/zorro.h>
36 #include <asm/amigaints.h>
37 #include <asm/amigahw.h>
39 #include <asm/pgtable.h>
41 /* The controller registers can be found in the Z2 config area at these
44 #define BLZ2060_ESP_ADDR 0x1ff00
45 #define BLZ2060_DMA_ADDR 0x1ffe0
48 /* The Blizzard 2060 DMA interface
49 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
50 * Only two things can be programmed in the Blizzard DMA:
51 * 1) The data direction is controlled by the status of bit 31 (1 = write)
52 * 2) The source/dest address (word aligned, shifted one right) in bits 30-0
54 * Figure out interrupt status by reading the ESP status byte.
56 struct blz2060_dma_registers {
57 volatile unsigned char dma_led_ctrl; /* DMA led control [0x000] */
58 unsigned char dmapad1[0x0f];
59 volatile unsigned char dma_addr0; /* DMA address (MSB) [0x010] */
60 unsigned char dmapad2[0x03];
61 volatile unsigned char dma_addr1; /* DMA address [0x014] */
62 unsigned char dmapad3[0x03];
63 volatile unsigned char dma_addr2; /* DMA address [0x018] */
64 unsigned char dmapad4[0x03];
65 volatile unsigned char dma_addr3; /* DMA address (LSB) [0x01c] */
68 #define BLZ2060_DMA_WRITE 0x80000000
70 /* DMA control bits */
71 #define BLZ2060_DMA_LED 0x02 /* HD led control 1 = off */
73 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
74 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
75 static void dma_dump_state(struct NCR_ESP *esp);
76 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
77 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
78 static void dma_ints_off(struct NCR_ESP *esp);
79 static void dma_ints_on(struct NCR_ESP *esp);
80 static int dma_irq_p(struct NCR_ESP *esp);
81 static void dma_led_off(struct NCR_ESP *esp);
82 static void dma_led_on(struct NCR_ESP *esp);
83 static int dma_ports_p(struct NCR_ESP *esp);
84 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
86 static volatile unsigned char cmd_buffer[16];
87 /* This is where all commands are put
88 * before they are transferred to the ESP chip
92 /***************************************************************** Detection */
93 int __init blz2060_esp_detect(Scsi_Host_Template *tpnt)
96 struct zorro_dev *z = NULL;
97 unsigned long address;
99 if ((z = zorro_find_device(ZORRO_PROD_PHASE5_BLIZZARD_2060, z))) {
100 unsigned long board = z->resource.start;
101 if (request_mem_region(board+BLZ2060_ESP_ADDR,
102 sizeof(struct ESP_regs), "NCR53C9x")) {
103 esp = esp_allocate(tpnt, (void *)board+BLZ2060_ESP_ADDR);
105 /* Do command transfer with programmed I/O */
106 esp->do_pio_cmds = 1;
108 /* Required functions */
109 esp->dma_bytes_sent = &dma_bytes_sent;
110 esp->dma_can_transfer = &dma_can_transfer;
111 esp->dma_dump_state = &dma_dump_state;
112 esp->dma_init_read = &dma_init_read;
113 esp->dma_init_write = &dma_init_write;
114 esp->dma_ints_off = &dma_ints_off;
115 esp->dma_ints_on = &dma_ints_on;
116 esp->dma_irq_p = &dma_irq_p;
117 esp->dma_ports_p = &dma_ports_p;
118 esp->dma_setup = &dma_setup;
120 /* Optional functions */
121 esp->dma_barrier = 0;
123 esp->dma_invalidate = 0;
124 esp->dma_irq_entry = 0;
125 esp->dma_irq_exit = 0;
126 esp->dma_led_on = &dma_led_on;
127 esp->dma_led_off = &dma_led_off;
131 /* SCSI chip speed */
132 esp->cfreq = 40000000;
134 /* The DMA registers on the Blizzard are mapped
135 * relative to the device (i.e. in the same Zorro
138 address = (unsigned long)ZTWO_VADDR(board);
139 esp->dregs = (void *)(address + BLZ2060_DMA_ADDR);
141 /* ESP register base */
142 esp->eregs = (struct ESP_regs *)(address + BLZ2060_ESP_ADDR);
144 /* Set the command buffer */
145 esp->esp_command = cmd_buffer;
146 esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);
148 esp->irq = IRQ_AMIGA_PORTS;
149 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
150 "Blizzard 2060 SCSI", esp->ehost);
152 /* Figure out our scsi ID on the bus */
155 /* We don't have a differential SCSI-bus. */
160 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
161 esps_running = esps_in_use;
168 /************************************************************* DMA Functions */
169 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
171 /* Since the Blizzard DMA is fully dedicated to the ESP chip,
172 * the number of bytes sent (to the ESP chip) equals the number
173 * of bytes in the FIFO - there is no buffering in the DMA controller.
174 * XXXX Do I read this right? It is from host to ESP, right?
179 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
181 /* I don't think there's any limit on the Blizzard DMA. So we use what
182 * the ESP chip can handle (24 bit).
184 unsigned long sz = sp->SCp.this_residual;
190 static void dma_dump_state(struct NCR_ESP *esp)
192 ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
193 custom.intreqr, custom.intenar));
196 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
198 struct blz2060_dma_registers *dregs =
199 (struct blz2060_dma_registers *) (esp->dregs);
201 cache_clear(addr, length);
204 addr &= ~(BLZ2060_DMA_WRITE);
205 dregs->dma_addr3 = (addr ) & 0xff;
206 dregs->dma_addr2 = (addr >> 8) & 0xff;
207 dregs->dma_addr1 = (addr >> 16) & 0xff;
208 dregs->dma_addr0 = (addr >> 24) & 0xff;
211 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
213 struct blz2060_dma_registers *dregs =
214 (struct blz2060_dma_registers *) (esp->dregs);
216 cache_push(addr, length);
219 addr |= BLZ2060_DMA_WRITE;
220 dregs->dma_addr3 = (addr ) & 0xff;
221 dregs->dma_addr2 = (addr >> 8) & 0xff;
222 dregs->dma_addr1 = (addr >> 16) & 0xff;
223 dregs->dma_addr0 = (addr >> 24) & 0xff;
226 static void dma_ints_off(struct NCR_ESP *esp)
228 disable_irq(esp->irq);
231 static void dma_ints_on(struct NCR_ESP *esp)
233 enable_irq(esp->irq);
236 static int dma_irq_p(struct NCR_ESP *esp)
238 return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
241 static void dma_led_off(struct NCR_ESP *esp)
243 ((struct blz2060_dma_registers *) (esp->dregs))->dma_led_ctrl =
247 static void dma_led_on(struct NCR_ESP *esp)
249 ((struct blz2060_dma_registers *) (esp->dregs))->dma_led_ctrl = 0;
252 static int dma_ports_p(struct NCR_ESP *esp)
254 return ((custom.intenar) & IF_PORTS);
257 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
259 /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
260 * so when (write) is true, it actually means READ!
263 dma_init_read(esp, addr, count);
265 dma_init_write(esp, addr, count);
271 int blz2060_esp_release(struct Scsi_Host *instance)
274 unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
276 esp_deallocate((struct NCR_ESP *)instance->hostdata);
278 release_mem_region(address, sizeof(struct ESP_regs));
279 free_irq(IRQ_AMIGA_PORTS, esp_intr);
285 static Scsi_Host_Template driver_template = {
286 .proc_name = "esp-blz2060",
287 .proc_info = esp_proc_info,
288 .name = "Blizzard2060 SCSI",
289 .detect = blz2060_esp_detect,
290 .slave_alloc = esp_slave_alloc,
291 .slave_destroy = esp_slave_destroy,
292 .release = blz2060_esp_release,
293 .queuecommand = esp_queue,
294 .eh_abort_handler = esp_abort,
295 .eh_bus_reset_handler = esp_reset,
298 .sg_tablesize = SG_ALL,
300 .use_clustering = ENABLE_CLUSTERING
304 #include "scsi_module.c"
306 MODULE_LICENSE("GPL");