1 /* sun_esp.c: ESP front-end for Sparc SBUS systems.
3 * Copyright (C) 2007, 2008 David S. Miller (davem@davemloft.net)
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/delay.h>
9 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/dma-mapping.h>
14 #include <linux/of_device.h>
20 #include <scsi/scsi_host.h>
24 #define DRV_MODULE_NAME "sun_esp"
25 #define PFX DRV_MODULE_NAME ": "
26 #define DRV_VERSION "1.100"
27 #define DRV_MODULE_RELDATE "August 27, 2008"
29 #define dma_read32(REG) \
30 sbus_readl(esp->dma_regs + (REG))
31 #define dma_write32(VAL, REG) \
32 sbus_writel((VAL), esp->dma_regs + (REG))
34 /* DVMA chip revisions */
45 static int __devinit esp_sbus_setup_dma(struct esp *esp,
46 struct of_device *dma_of)
50 esp->dma_regs = of_ioremap(&dma_of->resource[0], 0,
51 resource_size(&dma_of->resource[0]),
56 switch (dma_read32(DMA_CSR) & DMA_DEVICE_ID) {
58 esp->dmarev = dvmarev0;
61 esp->dmarev = dvmaesc1;
64 esp->dmarev = dvmarev1;
67 esp->dmarev = dvmarev2;
70 esp->dmarev = dvmahme;
73 esp->dmarev = dvmarevplus;
81 static int __devinit esp_sbus_map_regs(struct esp *esp, int hme)
83 struct of_device *op = esp->dev;
86 /* On HME, two reg sets exist, first is DVMA,
87 * second is ESP registers.
90 res = &op->resource[1];
92 res = &op->resource[0];
94 esp->regs = of_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP");
101 static int __devinit esp_sbus_map_command_block(struct esp *esp)
103 struct of_device *op = esp->dev;
105 esp->command_block = dma_alloc_coherent(&op->dev, 16,
106 &esp->command_block_dma,
108 if (!esp->command_block)
113 static int __devinit esp_sbus_register_irq(struct esp *esp)
115 struct Scsi_Host *host = esp->host;
116 struct of_device *op = esp->dev;
118 host->irq = op->irqs[0];
119 return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
122 static void __devinit esp_get_scsi_id(struct esp *esp, struct of_device *espdma)
124 struct of_device *op = esp->dev;
125 struct device_node *dp;
128 esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff);
129 if (esp->scsi_id != 0xff)
132 esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff);
133 if (esp->scsi_id != 0xff)
136 esp->scsi_id = of_getintprop_default(espdma->node,
137 "scsi-initiator-id", 7);
140 esp->host->this_id = esp->scsi_id;
141 esp->scsi_id_mask = (1 << esp->scsi_id);
144 static void __devinit esp_get_differential(struct esp *esp)
146 struct of_device *op = esp->dev;
147 struct device_node *dp;
150 if (of_find_property(dp, "differential", NULL))
151 esp->flags |= ESP_FLAG_DIFFERENTIAL;
153 esp->flags &= ~ESP_FLAG_DIFFERENTIAL;
156 static void __devinit esp_get_clock_params(struct esp *esp)
158 struct of_device *op = esp->dev;
159 struct device_node *bus_dp, *dp;
165 fmhz = of_getintprop_default(dp, "clock-frequency", 0);
167 fmhz = of_getintprop_default(bus_dp, "clock-frequency", 0);
172 static void __devinit esp_get_bursts(struct esp *esp, struct of_device *dma_of)
174 struct device_node *dma_dp = dma_of->node;
175 struct of_device *op = esp->dev;
176 struct device_node *dp;
180 bursts = of_getintprop_default(dp, "burst-sizes", 0xff);
181 val = of_getintprop_default(dma_dp, "burst-sizes", 0xff);
185 val = of_getintprop_default(dma_dp->parent, "burst-sizes", 0xff);
189 if (bursts == 0xff ||
190 (bursts & DMA_BURST16) == 0 ||
191 (bursts & DMA_BURST32) == 0)
192 bursts = (DMA_BURST32 - 1);
194 esp->bursts = bursts;
197 static void __devinit esp_sbus_get_props(struct esp *esp, struct of_device *espdma)
199 esp_get_scsi_id(esp, espdma);
200 esp_get_differential(esp);
201 esp_get_clock_params(esp);
202 esp_get_bursts(esp, espdma);
205 static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg)
207 sbus_writeb(val, esp->regs + (reg * 4UL));
210 static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
212 return sbus_readb(esp->regs + (reg * 4UL));
215 static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
218 struct of_device *op = esp->dev;
220 return dma_map_single(&op->dev, buf, sz, dir);
223 static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
226 struct of_device *op = esp->dev;
228 return dma_map_sg(&op->dev, sg, num_sg, dir);
231 static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
234 struct of_device *op = esp->dev;
236 dma_unmap_single(&op->dev, addr, sz, dir);
239 static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
242 struct of_device *op = esp->dev;
244 dma_unmap_sg(&op->dev, sg, num_sg, dir);
247 static int sbus_esp_irq_pending(struct esp *esp)
249 if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
254 static void sbus_esp_reset_dma(struct esp *esp)
256 int can_do_burst16, can_do_burst32, can_do_burst64;
257 int can_do_sbus64, lim;
258 struct of_device *op;
261 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
262 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
266 if (sbus_can_dma_64bit())
268 if (sbus_can_burst64())
269 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
271 /* Put the DVMA into a known state. */
272 if (esp->dmarev != dvmahme) {
273 val = dma_read32(DMA_CSR);
274 dma_write32(val | DMA_RST_SCSI, DMA_CSR);
275 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
277 switch (esp->dmarev) {
279 dma_write32(DMA_RESET_FAS366, DMA_CSR);
280 dma_write32(DMA_RST_SCSI, DMA_CSR);
282 esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS |
283 DMA_SCSI_DISAB | DMA_INT_ENAB);
285 esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE |
289 esp->prev_hme_dmacsr |= DMA_BRST64;
290 else if (can_do_burst32)
291 esp->prev_hme_dmacsr |= DMA_BRST32;
294 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
295 sbus_set_sbus64(&op->dev, esp->bursts);
299 while (dma_read32(DMA_CSR) & DMA_PEND_READ) {
301 printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ "
303 esp->host->unique_id);
309 dma_write32(0, DMA_CSR);
310 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
312 dma_write32(0, DMA_ADDR);
316 if (esp->rev != ESP100) {
317 val = dma_read32(DMA_CSR);
318 dma_write32(val | DMA_3CLKS, DMA_CSR);
323 val = dma_read32(DMA_CSR);
326 if (can_do_burst32) {
330 dma_write32(val, DMA_CSR);
334 val = dma_read32(DMA_CSR);
335 val |= DMA_ADD_ENABLE;
336 val &= ~DMA_BCNT_ENAB;
337 if (!can_do_burst32 && can_do_burst16) {
338 val |= DMA_ESC_BURST;
340 val &= ~(DMA_ESC_BURST);
342 dma_write32(val, DMA_CSR);
349 /* Enable interrupts. */
350 val = dma_read32(DMA_CSR);
351 dma_write32(val | DMA_INT_ENAB, DMA_CSR);
354 static void sbus_esp_dma_drain(struct esp *esp)
359 if (esp->dmarev == dvmahme)
362 csr = dma_read32(DMA_CSR);
363 if (!(csr & DMA_FIFO_ISDRAIN))
366 if (esp->dmarev != dvmarev3 && esp->dmarev != dvmaesc1)
367 dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
370 while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
372 printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
373 esp->host->unique_id);
380 static void sbus_esp_dma_invalidate(struct esp *esp)
382 if (esp->dmarev == dvmahme) {
383 dma_write32(DMA_RST_SCSI, DMA_CSR);
385 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
386 (DMA_PARITY_OFF | DMA_2CLKS |
387 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
388 ~(DMA_ST_WRITE | DMA_ENABLE));
390 dma_write32(0, DMA_CSR);
391 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
393 /* This is necessary to avoid having the SCSI channel
394 * engine lock up on us.
396 dma_write32(0, DMA_ADDR);
402 while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
404 printk(KERN_ALERT PFX "esp%d: DMA will not "
405 "invalidate!\n", esp->host->unique_id);
411 val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
413 dma_write32(val, DMA_CSR);
414 val &= ~DMA_FIFO_INV;
415 dma_write32(val, DMA_CSR);
419 static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
420 u32 dma_count, int write, u8 cmd)
424 BUG_ON(!(cmd & ESP_CMD_DMA));
426 sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
427 sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
428 if (esp->rev == FASHME) {
429 sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO);
430 sbus_esp_write8(esp, 0, FAS_RHI);
432 scsi_esp_cmd(esp, cmd);
434 csr = esp->prev_hme_dmacsr;
435 csr |= DMA_SCSI_DISAB | DMA_ENABLE;
439 csr &= ~DMA_ST_WRITE;
440 esp->prev_hme_dmacsr = csr;
442 dma_write32(dma_count, DMA_COUNT);
443 dma_write32(addr, DMA_ADDR);
444 dma_write32(csr, DMA_CSR);
446 csr = dma_read32(DMA_CSR);
451 csr &= ~DMA_ST_WRITE;
452 dma_write32(csr, DMA_CSR);
453 if (esp->dmarev == dvmaesc1) {
454 u32 end = PAGE_ALIGN(addr + dma_count + 16U);
455 dma_write32(end - addr, DMA_COUNT);
457 dma_write32(addr, DMA_ADDR);
459 scsi_esp_cmd(esp, cmd);
464 static int sbus_esp_dma_error(struct esp *esp)
466 u32 csr = dma_read32(DMA_CSR);
468 if (csr & DMA_HNDL_ERROR)
474 static const struct esp_driver_ops sbus_esp_ops = {
475 .esp_write8 = sbus_esp_write8,
476 .esp_read8 = sbus_esp_read8,
477 .map_single = sbus_esp_map_single,
478 .map_sg = sbus_esp_map_sg,
479 .unmap_single = sbus_esp_unmap_single,
480 .unmap_sg = sbus_esp_unmap_sg,
481 .irq_pending = sbus_esp_irq_pending,
482 .reset_dma = sbus_esp_reset_dma,
483 .dma_drain = sbus_esp_dma_drain,
484 .dma_invalidate = sbus_esp_dma_invalidate,
485 .send_dma_cmd = sbus_esp_send_dma_cmd,
486 .dma_error = sbus_esp_dma_error,
489 static int __devinit esp_sbus_probe_one(struct of_device *op,
490 struct of_device *espdma,
493 struct scsi_host_template *tpnt = &scsi_esp_template;
494 struct Scsi_Host *host;
498 host = scsi_host_alloc(tpnt, sizeof(struct esp));
504 host->max_id = (hme ? 16 : 8);
505 esp = shost_priv(host);
509 esp->ops = &sbus_esp_ops;
512 esp->flags |= ESP_FLAG_WIDE_CAPABLE;
514 err = esp_sbus_setup_dma(esp, espdma);
518 err = esp_sbus_map_regs(esp, hme);
522 err = esp_sbus_map_command_block(esp);
524 goto fail_unmap_regs;
526 err = esp_sbus_register_irq(esp);
528 goto fail_unmap_command_block;
530 esp_sbus_get_props(esp, espdma);
532 /* Before we try to touch the ESP chip, ESC1 dma can
533 * come up with the reset bit set, so make sure that
536 if (esp->dmarev == dvmaesc1) {
537 u32 val = dma_read32(DMA_CSR);
539 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
542 dev_set_drvdata(&op->dev, esp);
544 err = scsi_esp_register(esp, &op->dev);
551 free_irq(host->irq, esp);
552 fail_unmap_command_block:
553 dma_free_coherent(&op->dev, 16,
555 esp->command_block_dma);
557 of_iounmap(&op->resource[(hme ? 1 : 0)], esp->regs, SBUS_ESP_REG_SIZE);
564 static int __devinit esp_sbus_probe(struct of_device *op, const struct of_device_id *match)
566 struct device_node *dma_node = NULL;
567 struct device_node *dp = op->node;
568 struct of_device *dma_of = NULL;
572 (!strcmp(dp->parent->name, "espdma") ||
573 !strcmp(dp->parent->name, "dma")))
574 dma_node = dp->parent;
575 else if (!strcmp(dp->name, "SUNW,fas")) {
580 dma_of = of_find_device_by_node(dma_node);
584 return esp_sbus_probe_one(op, dma_of, hme);
587 static int __devexit esp_sbus_remove(struct of_device *op)
589 struct esp *esp = dev_get_drvdata(&op->dev);
590 struct of_device *dma_of = esp->dma;
591 unsigned int irq = esp->host->irq;
595 scsi_esp_unregister(esp);
597 /* Disable interrupts. */
598 val = dma_read32(DMA_CSR);
599 dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
603 is_hme = (esp->dmarev == dvmahme);
605 dma_free_coherent(&op->dev, 16,
607 esp->command_block_dma);
608 of_iounmap(&op->resource[(is_hme ? 1 : 0)], esp->regs,
610 of_iounmap(&dma_of->resource[0], esp->dma_regs,
611 resource_size(&dma_of->resource[0]));
613 scsi_host_put(esp->host);
615 dev_set_drvdata(&op->dev, NULL);
620 static const struct of_device_id esp_match[] = {
632 MODULE_DEVICE_TABLE(of, esp_match);
634 static struct of_platform_driver esp_sbus_driver = {
636 .match_table = esp_match,
637 .probe = esp_sbus_probe,
638 .remove = __devexit_p(esp_sbus_remove),
641 static int __init sunesp_init(void)
643 return of_register_driver(&esp_sbus_driver, &of_bus_type);
646 static void __exit sunesp_exit(void)
648 of_unregister_driver(&esp_sbus_driver);
651 MODULE_DESCRIPTION("Sun ESP SCSI driver");
652 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
653 MODULE_LICENSE("GPL");
654 MODULE_VERSION(DRV_VERSION);
656 module_init(sunesp_init);
657 module_exit(sunesp_exit);