1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Zalon 53c7xx device driver. 4 * By Richard Hirst (rhirst@linuxcare.com) 5 */ 6 7 #include <linux/init.h> 8 #include <linux/interrupt.h> 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <asm/hardware.h> 12 #include <asm/io.h> 13 14 #include "../parisc/gsc.h" 15 16 #include "ncr53c8xx.h" 17 18 MODULE_AUTHOR("Richard Hirst"); 19 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver"); 20 MODULE_LICENSE("GPL"); 21 22 #define GSC_SCSI_ZALON_OFFSET 0x800 23 24 #define IO_MODULE_EIM (1*4) 25 #define IO_MODULE_DC_ADATA (2*4) 26 #define IO_MODULE_II_CDATA (3*4) 27 #define IO_MODULE_IO_COMMAND (12*4) 28 #define IO_MODULE_IO_STATUS (13*4) 29 30 #define IOSTATUS_RY 0x40 31 #define IOSTATUS_FE 0x80 32 #define IOIIDATA_SMINT5L 0x40000000 33 #define IOIIDATA_MINT5EN 0x20000000 34 #define IOIIDATA_PACKEN 0x10000000 35 #define IOIIDATA_PREFETCHEN 0x08000000 36 #define IOIIDATA_IOII 0x00000020 37 38 #define CMD_RESET 5 39 40 static struct ncr_chip zalon720_chip __initdata = { 41 .revision_id = 0x0f, 42 .burst_max = 3, 43 .offset_max = 8, 44 .nr_divisor = 4, 45 .features = FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA, 46 }; 47 48 49 50 #if 0 51 /* FIXME: 52 * Is this function dead code? or is someone planning on using it in the 53 * future. The clock = (int) pdc_result[16] does not look correct to 54 * me ... I think it should be iodc_data[16]. Since this cause a compile 55 * error with the new encapsulated PDC, I'm not compiling in this function. 56 * - RB 57 */ 58 /* poke SCSI clock out of iodc data */ 59 60 static u8 iodc_data[32] __attribute__ ((aligned (64))); 61 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0}; 62 63 static int 64 lasi_scsi_clock(void * hpa, int defaultclock) 65 { 66 int clock, status; 67 68 status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 ); 69 if (status == PDC_RET_OK) { 70 clock = (int) pdc_result[16]; 71 } else { 72 printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status); 73 clock = defaultclock; 74 } 75 76 printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock); 77 return clock; 78 } 79 #endif 80 81 static struct scsi_host_template zalon7xx_template = { 82 .module = THIS_MODULE, 83 .proc_name = "zalon7xx", 84 }; 85 86 static int __init 87 zalon_probe(struct parisc_device *dev) 88 { 89 struct gsc_irq gsc_irq; 90 u32 zalon_vers; 91 int error = -ENODEV; 92 void __iomem *zalon = ioremap(dev->hpa.start, 4096); 93 void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET; 94 static int unit = 0; 95 struct Scsi_Host *host; 96 struct ncr_device device; 97 98 __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND); 99 while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY)) 100 cpu_relax(); 101 __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN, 102 zalon + IO_MODULE_II_CDATA); 103 104 /* XXX: Save the Zalon version for bug workarounds? */ 105 zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07; 106 107 /* Setup the interrupts first. 108 ** Later on request_irq() will register the handler. 109 */ 110 dev->irq = gsc_alloc_irq(&gsc_irq); 111 112 printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__, 113 zalon_vers, dev->irq); 114 115 __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM); 116 117 if (zalon_vers == 0) 118 printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__); 119 120 memset(&device, 0, sizeof(struct ncr_device)); 121 122 /* The following three are needed before any other access. */ 123 __raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG, EA */ 124 __raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */ 125 __raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */ 126 127 /* Initialise ncr_device structure with items required by ncr_attach. */ 128 device.chip = zalon720_chip; 129 device.host_id = 7; 130 device.dev = &dev->dev; 131 device.slot.base = dev->hpa.start + GSC_SCSI_ZALON_OFFSET; 132 device.slot.base_v = io_port; 133 device.slot.irq = dev->irq; 134 device.differential = 2; 135 136 host = ncr_attach(&zalon7xx_template, unit, &device); 137 if (!host) 138 return -ENODEV; 139 140 if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) { 141 dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ", 142 dev->irq); 143 goto fail; 144 } 145 146 unit++; 147 148 dev_set_drvdata(&dev->dev, host); 149 150 error = scsi_add_host(host, &dev->dev); 151 if (error) 152 goto fail_free_irq; 153 154 scsi_scan_host(host); 155 return 0; 156 157 fail_free_irq: 158 free_irq(dev->irq, host); 159 fail: 160 ncr53c8xx_release(host); 161 return error; 162 } 163 164 static const struct parisc_device_id zalon_tbl[] __initconst = { 165 { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 }, 166 { 0, } 167 }; 168 169 MODULE_DEVICE_TABLE(parisc, zalon_tbl); 170 171 static void __exit zalon_remove(struct parisc_device *dev) 172 { 173 struct Scsi_Host *host = dev_get_drvdata(&dev->dev); 174 175 scsi_remove_host(host); 176 ncr53c8xx_release(host); 177 free_irq(dev->irq, host); 178 } 179 180 static struct parisc_driver zalon_driver __refdata = { 181 .name = "zalon", 182 .id_table = zalon_tbl, 183 .probe = zalon_probe, 184 .remove = __exit_p(zalon_remove), 185 }; 186 187 static int __init zalon7xx_init(void) 188 { 189 int ret = ncr53c8xx_init(); 190 if (!ret) 191 ret = register_parisc_driver(&zalon_driver); 192 if (ret) 193 ncr53c8xx_exit(); 194 return ret; 195 } 196 197 static void __exit zalon7xx_exit(void) 198 { 199 unregister_parisc_driver(&zalon_driver); 200 ncr53c8xx_exit(); 201 } 202 203 module_init(zalon7xx_init); 204 module_exit(zalon7xx_exit); 205