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