drivers/scsi/jazz_esp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
   3  *
   4  * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/gfp.h>
   9 #include <linux/types.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/dma-mapping.h>
  15
  16 #include <asm/irq.h>
  17 #include <asm/io.h>
  18 #include <asm/dma.h>
  19
  20 #include <asm/jazz.h>
  21 #include <asm/jazzdma.h>
  22
  23 #include <scsi/scsi_host.h>
  24
  25 #include "esp_scsi.h"
  26
  27 #define DRV_MODULE_NAME         "jazz_esp"
  28 #define PFX DRV_MODULE_NAME     ": "
  29 #define DRV_VERSION             "1.000"
  30 #define DRV_MODULE_RELDATE      "May 19, 2007"
  31
  32 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
  33 {
  34         *(volatile u8 *)(esp->regs + reg) = val;
  35 }
  36
  37 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
  38 {
  39         return *(volatile u8 *)(esp->regs + reg);
  40 }
  41
  42 static int jazz_esp_irq_pending(struct esp *esp)
  43 {
  44         if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
  45                 return 1;
  46         return 0;
  47 }
  48
  49 static void jazz_esp_reset_dma(struct esp *esp)
  50 {
  51         vdma_disable ((int)esp->dma_regs);
  52 }
  53
  54 static void jazz_esp_dma_drain(struct esp *esp)
  55 {
  56         /* nothing to do */
  57 }
  58
  59 static void jazz_esp_dma_invalidate(struct esp *esp)
  60 {
  61         vdma_disable ((int)esp->dma_regs);
  62 }
  63
  64 static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
  65                                   u32 dma_count, int write, u8 cmd)
  66 {
  67         BUG_ON(!(cmd & ESP_CMD_DMA));
  68
  69         jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
  70         jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
  71         vdma_disable ((int)esp->dma_regs);
  72         if (write)
  73                 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
  74         else
  75                 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
  76
  77         vdma_set_addr ((int)esp->dma_regs, addr);
  78         vdma_set_count ((int)esp->dma_regs, dma_count);
  79         vdma_enable ((int)esp->dma_regs);
  80
  81         scsi_esp_cmd(esp, cmd);
  82 }
  83
  84 static int jazz_esp_dma_error(struct esp *esp)
  85 {
  86         u32 enable = vdma_get_enable((int)esp->dma_regs);
  87
  88         if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
  89                 return 1;
  90
  91         return 0;
  92 }
  93
  94 static const struct esp_driver_ops jazz_esp_ops = {
  95         .esp_write8     =       jazz_esp_write8,
  96         .esp_read8      =       jazz_esp_read8,
  97         .irq_pending    =       jazz_esp_irq_pending,
  98         .reset_dma      =       jazz_esp_reset_dma,
  99         .dma_drain      =       jazz_esp_dma_drain,
 100         .dma_invalidate =       jazz_esp_dma_invalidate,
 101         .send_dma_cmd   =       jazz_esp_send_dma_cmd,
 102         .dma_error      =       jazz_esp_dma_error,
 103 };
 104
 105 static int esp_jazz_probe(struct platform_device *dev)
 106 {
 107         const struct scsi_host_template *tpnt = &scsi_esp_template;
 108         struct Scsi_Host *host;
 109         struct esp *esp;
 110         struct resource *res;
 111         int err;
 112
 113         host = scsi_host_alloc(tpnt, sizeof(struct esp));
 114
 115         err = -ENOMEM;
 116         if (!host)
 117                 goto fail;
 118
 119         host->max_id = 8;
 120         esp = shost_priv(host);
 121
 122         esp->host = host;
 123         esp->dev = &dev->dev;
 124         esp->ops = &jazz_esp_ops;
 125
 126         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 127         if (!res)
 128                 goto fail_unlink;
 129
 130         esp->regs = (void __iomem *)res->start;
 131         if (!esp->regs)
 132                 goto fail_unlink;
 133
 134         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
 135         if (!res)
 136                 goto fail_unlink;
 137
 138         esp->dma_regs = (void __iomem *)res->start;
 139
 140         esp->command_block = dma_alloc_coherent(esp->dev, 16,
 141                                                 &esp->command_block_dma,
 142                                                 GFP_KERNEL);
 143         if (!esp->command_block)
 144                 goto fail_unmap_regs;
 145
 146         host->irq = err = platform_get_irq(dev, 0);
 147         if (err < 0)
 148                 goto fail_unmap_command_block;
 149         err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
 150         if (err < 0)
 151                 goto fail_unmap_command_block;
 152
 153         esp->scsi_id = 7;
 154         esp->host->this_id = esp->scsi_id;
 155         esp->scsi_id_mask = (1 << esp->scsi_id);
 156         esp->cfreq = 40000000;
 157
 158         dev_set_drvdata(&dev->dev, esp);
 159
 160         err = scsi_esp_register(esp);
 161         if (err)
 162                 goto fail_free_irq;
 163
 164         return 0;
 165
 166 fail_free_irq:
 167         free_irq(host->irq, esp);
 168 fail_unmap_command_block:
 169         dma_free_coherent(esp->dev, 16,
 170                           esp->command_block,
 171                           esp->command_block_dma);
 172 fail_unmap_regs:
 173 fail_unlink:
 174         scsi_host_put(host);
 175 fail:
 176         return err;
 177 }
 178
 179 static void esp_jazz_remove(struct platform_device *dev)
 180 {
 181         struct esp *esp = dev_get_drvdata(&dev->dev);
 182         unsigned int irq = esp->host->irq;
 183
 184         scsi_esp_unregister(esp);
 185
 186         free_irq(irq, esp);
 187         dma_free_coherent(esp->dev, 16,
 188                           esp->command_block,
 189                           esp->command_block_dma);
 190
 191         scsi_host_put(esp->host);
 192 }
 193
 194 /* work with hotplug and coldplug */
 195 MODULE_ALIAS("platform:jazz_esp");
 196
 197 static struct platform_driver esp_jazz_driver = {
 198         .probe          = esp_jazz_probe,
 199         .remove_new     = esp_jazz_remove,
 200         .driver = {
 201                 .name   = "jazz_esp",
 202         },
 203 };
 204 module_platform_driver(esp_jazz_driver);
 205
 206 MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
 207 MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
 208 MODULE_LICENSE("GPL");
 209 MODULE_VERSION(DRV_VERSION);