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 const struct parisc_device_id zalon_tbl[] __initconst = { 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 __refdata = { 182 .name = "zalon", 183 .id_table = zalon_tbl, 184 .probe = zalon_probe, 185 .remove = __exit_p(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