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- /* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
- *
- * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
- */
- #include <linux/kernel.h>
- #include <linux/gfp.h>
- #include <linux/types.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/platform_device.h>
- #include <linux/dma-mapping.h>
- #include <asm/irq.h>
- #include <asm/io.h>
- #include <asm/dma.h>
- #include <asm/jazz.h>
- #include <asm/jazzdma.h>
- #include <scsi/scsi_host.h>
- #include "esp_scsi.h"
- #define DRV_MODULE_NAME "jazz_esp"
- #define PFX DRV_MODULE_NAME ": "
- #define DRV_VERSION "1.000"
- #define DRV_MODULE_RELDATE "May 19, 2007"
- static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
- {
- *(volatile u8 *)(esp->regs + reg) = val;
- }
- static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
- {
- return *(volatile u8 *)(esp->regs + reg);
- }
- static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
- size_t sz, int dir)
- {
- return dma_map_single(esp->dev, buf, sz, dir);
- }
- static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
- int num_sg, int dir)
- {
- return dma_map_sg(esp->dev, sg, num_sg, dir);
- }
- static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
- size_t sz, int dir)
- {
- dma_unmap_single(esp->dev, addr, sz, dir);
- }
- static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
- int num_sg, int dir)
- {
- dma_unmap_sg(esp->dev, sg, num_sg, dir);
- }
- static int jazz_esp_irq_pending(struct esp *esp)
- {
- if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
- return 1;
- return 0;
- }
- static void jazz_esp_reset_dma(struct esp *esp)
- {
- vdma_disable ((int)esp->dma_regs);
- }
- static void jazz_esp_dma_drain(struct esp *esp)
- {
- /* nothing to do */
- }
- static void jazz_esp_dma_invalidate(struct esp *esp)
- {
- vdma_disable ((int)esp->dma_regs);
- }
- static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
- u32 dma_count, int write, u8 cmd)
- {
- BUG_ON(!(cmd & ESP_CMD_DMA));
- jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
- jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
- vdma_disable ((int)esp->dma_regs);
- if (write)
- vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
- else
- vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
- vdma_set_addr ((int)esp->dma_regs, addr);
- vdma_set_count ((int)esp->dma_regs, dma_count);
- vdma_enable ((int)esp->dma_regs);
- scsi_esp_cmd(esp, cmd);
- }
- static int jazz_esp_dma_error(struct esp *esp)
- {
- u32 enable = vdma_get_enable((int)esp->dma_regs);
- if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
- return 1;
- return 0;
- }
- static const struct esp_driver_ops jazz_esp_ops = {
- .esp_write8 = jazz_esp_write8,
- .esp_read8 = jazz_esp_read8,
- .map_single = jazz_esp_map_single,
- .map_sg = jazz_esp_map_sg,
- .unmap_single = jazz_esp_unmap_single,
- .unmap_sg = jazz_esp_unmap_sg,
- .irq_pending = jazz_esp_irq_pending,
- .reset_dma = jazz_esp_reset_dma,
- .dma_drain = jazz_esp_dma_drain,
- .dma_invalidate = jazz_esp_dma_invalidate,
- .send_dma_cmd = jazz_esp_send_dma_cmd,
- .dma_error = jazz_esp_dma_error,
- };
- static int __devinit esp_jazz_probe(struct platform_device *dev)
- {
- struct scsi_host_template *tpnt = &scsi_esp_template;
- struct Scsi_Host *host;
- struct esp *esp;
- struct resource *res;
- int err;
- host = scsi_host_alloc(tpnt, sizeof(struct esp));
- err = -ENOMEM;
- if (!host)
- goto fail;
- host->max_id = 8;
- esp = shost_priv(host);
- esp->host = host;
- esp->dev = dev;
- esp->ops = &jazz_esp_ops;
- res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (!res)
- goto fail_unlink;
- esp->regs = (void __iomem *)res->start;
- if (!esp->regs)
- goto fail_unlink;
- res = platform_get_resource(dev, IORESOURCE_MEM, 1);
- if (!res)
- goto fail_unlink;
- esp->dma_regs = (void __iomem *)res->start;
- esp->command_block = dma_alloc_coherent(esp->dev, 16,
- &esp->command_block_dma,
- GFP_KERNEL);
- if (!esp->command_block)
- goto fail_unmap_regs;
- host->irq = platform_get_irq(dev, 0);
- err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
- if (err < 0)
- goto fail_unmap_command_block;
- esp->scsi_id = 7;
- esp->host->this_id = esp->scsi_id;
- esp->scsi_id_mask = (1 << esp->scsi_id);
- esp->cfreq = 40000000;
- dev_set_drvdata(&dev->dev, esp);
- err = scsi_esp_register(esp, &dev->dev);
- if (err)
- goto fail_free_irq;
- return 0;
- fail_free_irq:
- free_irq(host->irq, esp);
- fail_unmap_command_block:
- dma_free_coherent(esp->dev, 16,
- esp->command_block,
- esp->command_block_dma);
- fail_unmap_regs:
- fail_unlink:
- scsi_host_put(host);
- fail:
- return err;
- }
- static int __devexit esp_jazz_remove(struct platform_device *dev)
- {
- struct esp *esp = dev_get_drvdata(&dev->dev);
- unsigned int irq = esp->host->irq;
- scsi_esp_unregister(esp);
- free_irq(irq, esp);
- dma_free_coherent(esp->dev, 16,
- esp->command_block,
- esp->command_block_dma);
- scsi_host_put(esp->host);
- return 0;
- }
- /* work with hotplug and coldplug */
- MODULE_ALIAS("platform:jazz_esp");
- static struct platform_driver esp_jazz_driver = {
- .probe = esp_jazz_probe,
- .remove = __devexit_p(esp_jazz_remove),
- .driver = {
- .name = "jazz_esp",
- .owner = THIS_MODULE,
- },
- };
- static int __init jazz_esp_init(void)
- {
- return platform_driver_register(&esp_jazz_driver);
- }
- static void __exit jazz_esp_exit(void)
- {
- platform_driver_unregister(&esp_jazz_driver);
- }
- MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
- MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
- MODULE_LICENSE("GPL");
- MODULE_VERSION(DRV_VERSION);
- module_init(jazz_esp_init);
- module_exit(jazz_esp_exit);
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