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Linux/drivers/scsi/zalon.c

  1 /*
  2  * Zalon 53c7xx device driver.
  3  * By Richard Hirst (rhirst@linuxcare.com)
  4  */
  5 
  6 #include <linux/init.h>
  7 #include <linux/interrupt.h>
  8 #include <linux/module.h>
  9 #include <linux/types.h>
 10 #include <asm/hardware.h>
 11 #include <asm/io.h>
 12 
 13 #include "../parisc/gsc.h"
 14 
 15 #include "ncr53c8xx.h"
 16 
 17 MODULE_AUTHOR("Richard Hirst");
 18 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
 19 MODULE_LICENSE("GPL");
 20 
 21 #define GSC_SCSI_ZALON_OFFSET 0x800
 22 
 23 #define IO_MODULE_EIM           (1*4)
 24 #define IO_MODULE_DC_ADATA      (2*4)
 25 #define IO_MODULE_II_CDATA      (3*4)
 26 #define IO_MODULE_IO_COMMAND    (12*4)
 27 #define IO_MODULE_IO_STATUS     (13*4)
 28 
 29 #define IOSTATUS_RY             0x40
 30 #define IOSTATUS_FE             0x80
 31 #define IOIIDATA_SMINT5L        0x40000000
 32 #define IOIIDATA_MINT5EN        0x20000000
 33 #define IOIIDATA_PACKEN         0x10000000
 34 #define IOIIDATA_PREFETCHEN     0x08000000
 35 #define IOIIDATA_IOII           0x00000020
 36 
 37 #define CMD_RESET               5
 38 
 39 static struct ncr_chip zalon720_chip __initdata = {
 40         .revision_id =  0x0f,
 41         .burst_max =    3,
 42         .offset_max =   8,
 43         .nr_divisor =   4,
 44         .features =     FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
 45 };
 46 
 47 
 48 
 49 #if 0
 50 /* FIXME:
 51  * Is this function dead code? or is someone planning on using it in the
 52  * future.  The clock = (int) pdc_result[16] does not look correct to
 53  * me ... I think it should be iodc_data[16].  Since this cause a compile
 54  * error with the new encapsulated PDC, I'm not compiling in this function.
 55  * - RB
 56  */
 57 /* poke SCSI clock out of iodc data */
 58 
 59 static u8 iodc_data[32] __attribute__ ((aligned (64)));
 60 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
 61 
 62 static int 
 63 lasi_scsi_clock(void * hpa, int defaultclock)
 64 {
 65         int clock, status;
 66 
 67         status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
 68         if (status == PDC_RET_OK) {
 69                 clock = (int) pdc_result[16];
 70         } else {
 71                 printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status);
 72                 clock = defaultclock; 
 73         }
 74 
 75         printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock);
 76         return clock;
 77 }
 78 #endif
 79 
 80 static struct scsi_host_template zalon7xx_template = {
 81         .module         = THIS_MODULE,
 82         .proc_name      = "zalon7xx",
 83 };
 84 
 85 static int __init
 86 zalon_probe(struct parisc_device *dev)
 87 {
 88         struct gsc_irq gsc_irq;
 89         u32 zalon_vers;
 90         int error = -ENODEV;
 91         void __iomem *zalon = ioremap_nocache(dev->hpa.start, 4096);
 92         void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET;
 93         static int unit = 0;
 94         struct Scsi_Host *host;
 95         struct ncr_device device;
 96 
 97         __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
 98         while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
 99                 cpu_relax();
100         __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
101                 zalon + IO_MODULE_II_CDATA);
102 
103         /* XXX: Save the Zalon version for bug workarounds? */
104         zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07;
105 
106         /* Setup the interrupts first.
107         ** Later on request_irq() will register the handler.
108         */
109         dev->irq = gsc_alloc_irq(&gsc_irq);
110 
111         printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
112                 zalon_vers, dev->irq);
113 
114         __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM);
115 
116         if (zalon_vers == 0)
117                 printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__);
118 
119         memset(&device, 0, sizeof(struct ncr_device));
120 
121         /* The following three are needed before any other access. */
122         __raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
123         __raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
124         __raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
125 
126         /* Initialise ncr_device structure with items required by ncr_attach. */
127         device.chip             = zalon720_chip;
128         device.host_id          = 7;
129         device.dev              = &dev->dev;
130         device.slot.base        = dev->hpa.start + GSC_SCSI_ZALON_OFFSET;
131         device.slot.base_v      = io_port;
132         device.slot.irq         = dev->irq;
133         device.differential     = 2;
134 
135         host = ncr_attach(&zalon7xx_template, unit, &device);
136         if (!host)
137                 return -ENODEV;
138 
139         if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
140           dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",
141                      dev->irq);
142                 goto fail;
143         }
144 
145         unit++;
146 
147         dev_set_drvdata(&dev->dev, host);
148 
149         error = scsi_add_host(host, &dev->dev);
150         if (error)
151                 goto fail_free_irq;
152 
153         scsi_scan_host(host);
154         return 0;
155 
156  fail_free_irq:
157         free_irq(dev->irq, host);
158  fail:
159         ncr53c8xx_release(host);
160         return error;
161 }
162 
163 static struct parisc_device_id zalon_tbl[] = {
164         { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 }, 
165         { 0, }
166 };
167 
168 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
169 
170 static int __exit zalon_remove(struct parisc_device *dev)
171 {
172         struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
173 
174         scsi_remove_host(host);
175         ncr53c8xx_release(host);
176         free_irq(dev->irq, host);
177 
178         return 0;
179 }
180 
181 static struct parisc_driver zalon_driver = {
182         .name =         "zalon",
183         .id_table =     zalon_tbl,
184         .probe =        zalon_probe,
185         .remove =       zalon_remove,
186 };
187 
188 static int __init zalon7xx_init(void)
189 {
190         int ret = ncr53c8xx_init();
191         if (!ret)
192                 ret = register_parisc_driver(&zalon_driver);
193         if (ret)
194                 ncr53c8xx_exit();
195         return ret;
196 }
197 
198 static void __exit zalon7xx_exit(void)
199 {
200         unregister_parisc_driver(&zalon_driver);
201         ncr53c8xx_exit();
202 }
203 
204 module_init(zalon7xx_init);
205 module_exit(zalon7xx_exit);
206 

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