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Linux/drivers/scsi/sun3x_esp.c

  1 /* sun3x_esp.c: ESP front-end for Sun3x systems.
  2  *
  3  * Copyright (C) 2007,2008 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  4  */
  5 
  6 #include <linux/kernel.h>
  7 #include <linux/gfp.h>
  8 #include <linux/types.h>
  9 #include <linux/delay.h>
 10 #include <linux/module.h>
 11 #include <linux/init.h>
 12 #include <linux/platform_device.h>
 13 #include <linux/dma-mapping.h>
 14 #include <linux/interrupt.h>
 15 
 16 #include <asm/sun3x.h>
 17 #include <asm/io.h>
 18 #include <asm/dma.h>
 19 #include <asm/dvma.h>
 20 
 21 /* DMA controller reg offsets */
 22 #define DMA_CSR         0x00UL  /* rw  DMA control/status register    0x00   */
 23 #define DMA_ADDR        0x04UL  /* rw  DMA transfer address register  0x04   */
 24 #define DMA_COUNT       0x08UL  /* rw  DMA transfer count register    0x08   */
 25 #define DMA_TEST        0x0cUL  /* rw  DMA test/debug register        0x0c   */
 26 
 27 #include <scsi/scsi_host.h>
 28 
 29 #include "esp_scsi.h"
 30 
 31 #define DRV_MODULE_NAME         "sun3x_esp"
 32 #define PFX DRV_MODULE_NAME     ": "
 33 #define DRV_VERSION             "1.000"
 34 #define DRV_MODULE_RELDATE      "Nov 1, 2007"
 35 
 36 /*
 37  * m68k always assumes readl/writel operate on little endian
 38  * mmio space; this is wrong at least for Sun3x, so we
 39  * need to workaround this until a proper way is found
 40  */
 41 #if 0
 42 #define dma_read32(REG) \
 43         readl(esp->dma_regs + (REG))
 44 #define dma_write32(VAL, REG) \
 45         writel((VAL), esp->dma_regs + (REG))
 46 #else
 47 #define dma_read32(REG) \
 48         *(volatile u32 *)(esp->dma_regs + (REG))
 49 #define dma_write32(VAL, REG) \
 50         do { *(volatile u32 *)(esp->dma_regs + (REG)) = (VAL); } while (0)
 51 #endif
 52 
 53 static void sun3x_esp_write8(struct esp *esp, u8 val, unsigned long reg)
 54 {
 55         writeb(val, esp->regs + (reg * 4UL));
 56 }
 57 
 58 static u8 sun3x_esp_read8(struct esp *esp, unsigned long reg)
 59 {
 60         return readb(esp->regs + (reg * 4UL));
 61 }
 62 
 63 static dma_addr_t sun3x_esp_map_single(struct esp *esp, void *buf,
 64                                       size_t sz, int dir)
 65 {
 66         return dma_map_single(esp->dev, buf, sz, dir);
 67 }
 68 
 69 static int sun3x_esp_map_sg(struct esp *esp, struct scatterlist *sg,
 70                                   int num_sg, int dir)
 71 {
 72         return dma_map_sg(esp->dev, sg, num_sg, dir);
 73 }
 74 
 75 static void sun3x_esp_unmap_single(struct esp *esp, dma_addr_t addr,
 76                                   size_t sz, int dir)
 77 {
 78         dma_unmap_single(esp->dev, addr, sz, dir);
 79 }
 80 
 81 static void sun3x_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
 82                               int num_sg, int dir)
 83 {
 84         dma_unmap_sg(esp->dev, sg, num_sg, dir);
 85 }
 86 
 87 static int sun3x_esp_irq_pending(struct esp *esp)
 88 {
 89         if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
 90                 return 1;
 91         return 0;
 92 }
 93 
 94 static void sun3x_esp_reset_dma(struct esp *esp)
 95 {
 96         u32 val;
 97 
 98         val = dma_read32(DMA_CSR);
 99         dma_write32(val | DMA_RST_SCSI, DMA_CSR);
100         dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
101 
102         /* Enable interrupts.  */
103         val = dma_read32(DMA_CSR);
104         dma_write32(val | DMA_INT_ENAB, DMA_CSR);
105 }
106 
107 static void sun3x_esp_dma_drain(struct esp *esp)
108 {
109         u32 csr;
110         int lim;
111 
112         csr = dma_read32(DMA_CSR);
113         if (!(csr & DMA_FIFO_ISDRAIN))
114                 return;
115 
116         dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
117 
118         lim = 1000;
119         while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
120                 if (--lim == 0) {
121                         printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
122                                esp->host->unique_id);
123                         break;
124                 }
125                 udelay(1);
126         }
127 }
128 
129 static void sun3x_esp_dma_invalidate(struct esp *esp)
130 {
131         u32 val;
132         int lim;
133 
134         lim = 1000;
135         while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
136                 if (--lim == 0) {
137                         printk(KERN_ALERT PFX "esp%d: DMA will not "
138                                "invalidate!\n", esp->host->unique_id);
139                         break;
140                 }
141                 udelay(1);
142         }
143 
144         val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
145         val |= DMA_FIFO_INV;
146         dma_write32(val, DMA_CSR);
147         val &= ~DMA_FIFO_INV;
148         dma_write32(val, DMA_CSR);
149 }
150 
151 static void sun3x_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
152                                   u32 dma_count, int write, u8 cmd)
153 {
154         u32 csr;
155 
156         BUG_ON(!(cmd & ESP_CMD_DMA));
157 
158         sun3x_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
159         sun3x_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
160         csr = dma_read32(DMA_CSR);
161         csr |= DMA_ENABLE;
162         if (write)
163                 csr |= DMA_ST_WRITE;
164         else
165                 csr &= ~DMA_ST_WRITE;
166         dma_write32(csr, DMA_CSR);
167         dma_write32(addr, DMA_ADDR);
168 
169         scsi_esp_cmd(esp, cmd);
170 }
171 
172 static int sun3x_esp_dma_error(struct esp *esp)
173 {
174         u32 csr = dma_read32(DMA_CSR);
175 
176         if (csr & DMA_HNDL_ERROR)
177                 return 1;
178 
179         return 0;
180 }
181 
182 static const struct esp_driver_ops sun3x_esp_ops = {
183         .esp_write8     =       sun3x_esp_write8,
184         .esp_read8      =       sun3x_esp_read8,
185         .map_single     =       sun3x_esp_map_single,
186         .map_sg         =       sun3x_esp_map_sg,
187         .unmap_single   =       sun3x_esp_unmap_single,
188         .unmap_sg       =       sun3x_esp_unmap_sg,
189         .irq_pending    =       sun3x_esp_irq_pending,
190         .reset_dma      =       sun3x_esp_reset_dma,
191         .dma_drain      =       sun3x_esp_dma_drain,
192         .dma_invalidate =       sun3x_esp_dma_invalidate,
193         .send_dma_cmd   =       sun3x_esp_send_dma_cmd,
194         .dma_error      =       sun3x_esp_dma_error,
195 };
196 
197 static int esp_sun3x_probe(struct platform_device *dev)
198 {
199         struct scsi_host_template *tpnt = &scsi_esp_template;
200         struct Scsi_Host *host;
201         struct esp *esp;
202         struct resource *res;
203         int err = -ENOMEM;
204 
205         host = scsi_host_alloc(tpnt, sizeof(struct esp));
206         if (!host)
207                 goto fail;
208 
209         host->max_id = 8;
210         esp = shost_priv(host);
211 
212         esp->host = host;
213         esp->dev = dev;
214         esp->ops = &sun3x_esp_ops;
215 
216         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
217         if (!res || !res->start)
218                 goto fail_unlink;
219 
220         esp->regs = ioremap_nocache(res->start, 0x20);
221         if (!esp->regs)
222                 goto fail_unmap_regs;
223 
224         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
225         if (!res || !res->start)
226                 goto fail_unmap_regs;
227 
228         esp->dma_regs = ioremap_nocache(res->start, 0x10);
229 
230         esp->command_block = dma_alloc_coherent(esp->dev, 16,
231                                                 &esp->command_block_dma,
232                                                 GFP_KERNEL);
233         if (!esp->command_block)
234                 goto fail_unmap_regs_dma;
235 
236         host->irq = platform_get_irq(dev, 0);
237         err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED,
238                           "SUN3X ESP", esp);
239         if (err < 0)
240                 goto fail_unmap_command_block;
241 
242         esp->scsi_id = 7;
243         esp->host->this_id = esp->scsi_id;
244         esp->scsi_id_mask = (1 << esp->scsi_id);
245         esp->cfreq = 20000000;
246 
247         dev_set_drvdata(&dev->dev, esp);
248 
249         err = scsi_esp_register(esp, &dev->dev);
250         if (err)
251                 goto fail_free_irq;
252 
253         return 0;
254 
255 fail_free_irq:
256         free_irq(host->irq, esp);
257 fail_unmap_command_block:
258         dma_free_coherent(esp->dev, 16,
259                           esp->command_block,
260                           esp->command_block_dma);
261 fail_unmap_regs_dma:
262         iounmap(esp->dma_regs);
263 fail_unmap_regs:
264         iounmap(esp->regs);
265 fail_unlink:
266         scsi_host_put(host);
267 fail:
268         return err;
269 }
270 
271 static int esp_sun3x_remove(struct platform_device *dev)
272 {
273         struct esp *esp = dev_get_drvdata(&dev->dev);
274         unsigned int irq = esp->host->irq;
275         u32 val;
276 
277         scsi_esp_unregister(esp);
278 
279         /* Disable interrupts.  */
280         val = dma_read32(DMA_CSR);
281         dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
282 
283         free_irq(irq, esp);
284         dma_free_coherent(esp->dev, 16,
285                           esp->command_block,
286                           esp->command_block_dma);
287 
288         scsi_host_put(esp->host);
289 
290         return 0;
291 }
292 
293 static struct platform_driver esp_sun3x_driver = {
294         .probe          = esp_sun3x_probe,
295         .remove         = esp_sun3x_remove,
296         .driver = {
297                 .name   = "sun3x_esp",
298                 .owner  = THIS_MODULE,
299         },
300 };
301 
302 static int __init sun3x_esp_init(void)
303 {
304         return platform_driver_register(&esp_sun3x_driver);
305 }
306 
307 static void __exit sun3x_esp_exit(void)
308 {
309         platform_driver_unregister(&esp_sun3x_driver);
310 }
311 
312 MODULE_DESCRIPTION("Sun3x ESP SCSI driver");
313 MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
314 MODULE_LICENSE("GPL");
315 MODULE_VERSION(DRV_VERSION);
316 
317 module_init(sun3x_esp_init);
318 module_exit(sun3x_esp_exit);
319 MODULE_ALIAS("platform:sun3x_esp");
320 

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