206 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*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 18MODULE_AUTHOR("Richard Hirst");19MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");20MODULE_LICENSE("GPL");21 22#define GSC_SCSI_ZALON_OFFSET 0x80023 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 0x4031#define IOSTATUS_FE 0x8032#define IOIIDATA_SMINT5L 0x4000000033#define IOIIDATA_MINT5EN 0x2000000034#define IOIIDATA_PACKEN 0x1000000035#define IOIIDATA_PREFETCHEN 0x0800000036#define IOIIDATA_IOII 0x0000002037 38#define CMD_RESET 539 40static 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 051/* FIXME:52 * Is this function dead code? or is someone planning on using it in the53 * future. The clock = (int) pdc_result[16] does not look correct to54 * me ... I think it should be iodc_data[16]. Since this cause a compile55 * error with the new encapsulated PDC, I'm not compiling in this function.56 * - RB57 */58/* poke SCSI clock out of iodc data */59 60static u8 iodc_data[32] __attribute__ ((aligned (64)));61static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};62 63static int 64lasi_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#endif80 81static struct scsi_host_template zalon7xx_template = {82 .module = THIS_MODULE,83 .proc_name = "zalon7xx",84 .cmd_size = sizeof(struct ncr_cmd_priv),85};86 87static int __init88zalon_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 165static const struct parisc_device_id zalon_tbl[] __initconst = {166 { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 }, 167 { 0, }168};169 170MODULE_DEVICE_TABLE(parisc, zalon_tbl);171 172static 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 181static 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 188static 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 198static void __exit zalon7xx_exit(void)199{200 unregister_parisc_driver(&zalon_driver);201 ncr53c8xx_exit();202}203 204module_init(zalon7xx_init);205module_exit(zalon7xx_exit);206