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 .cmd_size = sizeof(struct ncr_cmd_priv), 85 }; 86 87 static int __init 88 zalon_probe(struct parisc_device *dev) 89 { 90 struct gsc_irq gsc_irq; 91 u32 zalon_vers; 92 int error = -ENODEV; 93 void __iomem *zalon = ioremap(dev->hpa.start, 4096); 94 void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET; 95 static int unit = 0; 96 struct Scsi_Host *host; 97 struct ncr_device device; 98 99 __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND); 100 while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY)) 101 cpu_relax(); 102 __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN, 103 zalon + IO_MODULE_II_CDATA); 104 105 /* XXX: Save the Zalon version for bug workarounds? */ 106 zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07; 107 108 /* Setup the interrupts first. 109 ** Later on request_irq() will register the handler. 110 */ 111 dev->irq = gsc_alloc_irq(&gsc_irq); 112 113 printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__, 114 zalon_vers, dev->irq); 115 116 __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM); 117 118 if (zalon_vers == 0) 119 printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__); 120 121 memset(&device, 0, sizeof(struct ncr_device)); 122 123 /* The following three are needed before any other access. */ 124 __raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG, EA */ 125 __raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */ 126 __raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */ 127 128 /* Initialise ncr_device structure with items required by ncr_attach. */ 129 device.chip = zalon720_chip; 130 device.host_id = 7; 131 device.dev = &dev->dev; 132 device.slot.base = dev->hpa.start + GSC_SCSI_ZALON_OFFSET; 133 device.slot.base_v = io_port; 134 device.slot.irq = dev->irq; 135 device.differential = 2; 136 137 host = ncr_attach(&zalon7xx_template, unit, &device); 138 if (!host) 139 return -ENODEV; 140 141 if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) { 142 dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n", 143 dev->irq); 144 goto fail; 145 } 146 147 unit++; 148 149 dev_set_drvdata(&dev->dev, host); 150 151 error = scsi_add_host(host, &dev->dev); 152 if (error) 153 goto fail_free_irq; 154 155 scsi_scan_host(host); 156 return 0; 157 158 fail_free_irq: 159 free_irq(dev->irq, host); 160 fail: 161 ncr53c8xx_release(host); 162 return error; 163 } 164 165 static const struct parisc_device_id zalon_tbl[] __initconst = { 166 { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 }, 167 { 0, } 168 }; 169 170 MODULE_DEVICE_TABLE(parisc, zalon_tbl); 171 172 static void __exit zalon_remove(struct parisc_device *dev) 173 { 174 struct Scsi_Host *host = dev_get_drvdata(&dev->dev); 175 176 scsi_remove_host(host); 177 ncr53c8xx_release(host); 178 free_irq(dev->irq, host); 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