linux/drivers/scsi/jazz_esp.c
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   1/* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
   2 *
   3 * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
   4 */
   5
   6#include <linux/kernel.h>
   7#include <linux/gfp.h>
   8#include <linux/types.h>
   9#include <linux/module.h>
  10#include <linux/init.h>
  11#include <linux/interrupt.h>
  12#include <linux/platform_device.h>
  13#include <linux/dma-mapping.h>
  14
  15#include <asm/irq.h>
  16#include <asm/io.h>
  17#include <asm/dma.h>
  18
  19#include <asm/jazz.h>
  20#include <asm/jazzdma.h>
  21
  22#include <scsi/scsi_host.h>
  23
  24#include "esp_scsi.h"
  25
  26#define DRV_MODULE_NAME         "jazz_esp"
  27#define PFX DRV_MODULE_NAME     ": "
  28#define DRV_VERSION             "1.000"
  29#define DRV_MODULE_RELDATE      "May 19, 2007"
  30
  31static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
  32{
  33        *(volatile u8 *)(esp->regs + reg) = val;
  34}
  35
  36static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
  37{
  38        return *(volatile u8 *)(esp->regs + reg);
  39}
  40
  41static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
  42                                      size_t sz, int dir)
  43{
  44        return dma_map_single(esp->dev, buf, sz, dir);
  45}
  46
  47static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
  48                                  int num_sg, int dir)
  49{
  50        return dma_map_sg(esp->dev, sg, num_sg, dir);
  51}
  52
  53static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
  54                                  size_t sz, int dir)
  55{
  56        dma_unmap_single(esp->dev, addr, sz, dir);
  57}
  58
  59static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
  60                              int num_sg, int dir)
  61{
  62        dma_unmap_sg(esp->dev, sg, num_sg, dir);
  63}
  64
  65static int jazz_esp_irq_pending(struct esp *esp)
  66{
  67        if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
  68                return 1;
  69        return 0;
  70}
  71
  72static void jazz_esp_reset_dma(struct esp *esp)
  73{
  74        vdma_disable ((int)esp->dma_regs);
  75}
  76
  77static void jazz_esp_dma_drain(struct esp *esp)
  78{
  79        /* nothing to do */
  80}
  81
  82static void jazz_esp_dma_invalidate(struct esp *esp)
  83{
  84        vdma_disable ((int)esp->dma_regs);
  85}
  86
  87static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
  88                                  u32 dma_count, int write, u8 cmd)
  89{
  90        BUG_ON(!(cmd & ESP_CMD_DMA));
  91
  92        jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
  93        jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
  94        vdma_disable ((int)esp->dma_regs);
  95        if (write)
  96                vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
  97        else
  98                vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
  99
 100        vdma_set_addr ((int)esp->dma_regs, addr);
 101        vdma_set_count ((int)esp->dma_regs, dma_count);
 102        vdma_enable ((int)esp->dma_regs);
 103
 104        scsi_esp_cmd(esp, cmd);
 105}
 106
 107static int jazz_esp_dma_error(struct esp *esp)
 108{
 109        u32 enable = vdma_get_enable((int)esp->dma_regs);
 110
 111        if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
 112                return 1;
 113
 114        return 0;
 115}
 116
 117static const struct esp_driver_ops jazz_esp_ops = {
 118        .esp_write8     =       jazz_esp_write8,
 119        .esp_read8      =       jazz_esp_read8,
 120        .map_single     =       jazz_esp_map_single,
 121        .map_sg         =       jazz_esp_map_sg,
 122        .unmap_single   =       jazz_esp_unmap_single,
 123        .unmap_sg       =       jazz_esp_unmap_sg,
 124        .irq_pending    =       jazz_esp_irq_pending,
 125        .reset_dma      =       jazz_esp_reset_dma,
 126        .dma_drain      =       jazz_esp_dma_drain,
 127        .dma_invalidate =       jazz_esp_dma_invalidate,
 128        .send_dma_cmd   =       jazz_esp_send_dma_cmd,
 129        .dma_error      =       jazz_esp_dma_error,
 130};
 131
 132static int esp_jazz_probe(struct platform_device *dev)
 133{
 134        struct scsi_host_template *tpnt = &scsi_esp_template;
 135        struct Scsi_Host *host;
 136        struct esp *esp;
 137        struct resource *res;
 138        int err;
 139
 140        host = scsi_host_alloc(tpnt, sizeof(struct esp));
 141
 142        err = -ENOMEM;
 143        if (!host)
 144                goto fail;
 145
 146        host->max_id = 8;
 147        esp = shost_priv(host);
 148
 149        esp->host = host;
 150        esp->dev = dev;
 151        esp->ops = &jazz_esp_ops;
 152
 153        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 154        if (!res)
 155                goto fail_unlink;
 156
 157        esp->regs = (void __iomem *)res->start;
 158        if (!esp->regs)
 159                goto fail_unlink;
 160
 161        res = platform_get_resource(dev, IORESOURCE_MEM, 1);
 162        if (!res)
 163                goto fail_unlink;
 164
 165        esp->dma_regs = (void __iomem *)res->start;
 166
 167        esp->command_block = dma_alloc_coherent(esp->dev, 16,
 168                                                &esp->command_block_dma,
 169                                                GFP_KERNEL);
 170        if (!esp->command_block)
 171                goto fail_unmap_regs;
 172
 173        host->irq = platform_get_irq(dev, 0);
 174        err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
 175        if (err < 0)
 176                goto fail_unmap_command_block;
 177
 178        esp->scsi_id = 7;
 179        esp->host->this_id = esp->scsi_id;
 180        esp->scsi_id_mask = (1 << esp->scsi_id);
 181        esp->cfreq = 40000000;
 182
 183        dev_set_drvdata(&dev->dev, esp);
 184
 185        err = scsi_esp_register(esp, &dev->dev);
 186        if (err)
 187                goto fail_free_irq;
 188
 189        return 0;
 190
 191fail_free_irq:
 192        free_irq(host->irq, esp);
 193fail_unmap_command_block:
 194        dma_free_coherent(esp->dev, 16,
 195                          esp->command_block,
 196                          esp->command_block_dma);
 197fail_unmap_regs:
 198fail_unlink:
 199        scsi_host_put(host);
 200fail:
 201        return err;
 202}
 203
 204static int esp_jazz_remove(struct platform_device *dev)
 205{
 206        struct esp *esp = dev_get_drvdata(&dev->dev);
 207        unsigned int irq = esp->host->irq;
 208
 209        scsi_esp_unregister(esp);
 210
 211        free_irq(irq, esp);
 212        dma_free_coherent(esp->dev, 16,
 213                          esp->command_block,
 214                          esp->command_block_dma);
 215
 216        scsi_host_put(esp->host);
 217
 218        return 0;
 219}
 220
 221/* work with hotplug and coldplug */
 222MODULE_ALIAS("platform:jazz_esp");
 223
 224static struct platform_driver esp_jazz_driver = {
 225        .probe          = esp_jazz_probe,
 226        .remove         = esp_jazz_remove,
 227        .driver = {
 228                .name   = "jazz_esp",
 229                .owner  = THIS_MODULE,
 230        },
 231};
 232
 233static int __init jazz_esp_init(void)
 234{
 235        return platform_driver_register(&esp_jazz_driver);
 236}
 237
 238static void __exit jazz_esp_exit(void)
 239{
 240        platform_driver_unregister(&esp_jazz_driver);
 241}
 242
 243MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
 244MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
 245MODULE_LICENSE("GPL");
 246MODULE_VERSION(DRV_VERSION);
 247
 248module_init(jazz_esp_init);
 249module_exit(jazz_esp_exit);
 250
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