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1// SPDX-License-Identifier: GPL-2.02 3/*4 * Amiga Gayle PATA controller driver5 *6 * Copyright (c) 2018 Samsung Electronics Co., Ltd.7 * http://www.samsung.com8 *9 * Based on gayle.c:10 *11 * Created 12 Jul 1997 by Geert Uytterhoeven12 */13 14#include <linux/ata.h>15#include <linux/blkdev.h>16#include <linux/delay.h>17#include <linux/interrupt.h>18#include <linux/kernel.h>19#include <linux/libata.h>20#include <linux/mm.h>21#include <linux/module.h>22#include <linux/platform_device.h>23#include <linux/zorro.h>24#include <scsi/scsi_cmnd.h>25#include <scsi/scsi_host.h>26 27#include <asm/amigahw.h>28#include <asm/amigaints.h>29#include <asm/amigayle.h>30#include <asm/setup.h>31 32#define DRV_NAME "pata_gayle"33#define DRV_VERSION "0.1.0"34 35#define GAYLE_CONTROL 0x101a36 37static const struct scsi_host_template pata_gayle_sht = {38 ATA_PIO_SHT(DRV_NAME),39};40 41/* FIXME: is this needed? */42static unsigned int pata_gayle_data_xfer(struct ata_queued_cmd *qc,43 unsigned char *buf,44 unsigned int buflen, int rw)45{46 struct ata_device *dev = qc->dev;47 struct ata_port *ap = dev->link->ap;48 void __iomem *data_addr = ap->ioaddr.data_addr;49 unsigned int words = buflen >> 1;50 51 /* Transfer multiple of 2 bytes */52 if (rw == READ)53 raw_insw((u16 *)data_addr, (u16 *)buf, words);54 else55 raw_outsw((u16 *)data_addr, (u16 *)buf, words);56 57 /* Transfer trailing byte, if any. */58 if (unlikely(buflen & 0x01)) {59 unsigned char pad[2] = { };60 61 /* Point buf to the tail of buffer */62 buf += buflen - 1;63 64 if (rw == READ) {65 raw_insw((u16 *)data_addr, (u16 *)pad, 1);66 *buf = pad[0];67 } else {68 pad[0] = *buf;69 raw_outsw((u16 *)data_addr, (u16 *)pad, 1);70 }71 words++;72 }73 74 return words << 1;75}76 77/*78 * Provide our own set_mode() as we don't want to change anything that has79 * already been configured..80 */81static int pata_gayle_set_mode(struct ata_link *link,82 struct ata_device **unused)83{84 struct ata_device *dev;85 86 ata_for_each_dev(dev, link, ENABLED) {87 /* We don't really care */88 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;89 dev->xfer_shift = ATA_SHIFT_PIO;90 dev->flags |= ATA_DFLAG_PIO;91 ata_dev_info(dev, "configured for PIO\n");92 }93 return 0;94}95 96static bool pata_gayle_irq_check(struct ata_port *ap)97{98 u8 ch;99 100 ch = z_readb((unsigned long)ap->private_data);101 102 return !!(ch & GAYLE_IRQ_IDE);103}104 105static void pata_gayle_irq_clear(struct ata_port *ap)106{107 (void)z_readb((unsigned long)ap->ioaddr.status_addr);108 z_writeb(0x7c, (unsigned long)ap->private_data);109}110 111static struct ata_port_operations pata_gayle_a1200_ops = {112 .inherits = &ata_sff_port_ops,113 .sff_data_xfer = pata_gayle_data_xfer,114 .sff_irq_check = pata_gayle_irq_check,115 .sff_irq_clear = pata_gayle_irq_clear,116 .cable_detect = ata_cable_unknown,117 .set_mode = pata_gayle_set_mode,118};119 120static struct ata_port_operations pata_gayle_a4000_ops = {121 .inherits = &ata_sff_port_ops,122 .sff_data_xfer = pata_gayle_data_xfer,123 .cable_detect = ata_cable_unknown,124 .set_mode = pata_gayle_set_mode,125};126 127static int pata_gayle_init_one(struct platform_device *pdev)128{129 struct resource *res;130 struct gayle_ide_platform_data *pdata;131 struct ata_host *host;132 struct ata_port *ap;133 void __iomem *base;134 int ret;135 136 pdata = dev_get_platdata(&pdev->dev);137 138 dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n",139 pdata->explicit_ack ? 1200 : 4000);140 141 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);142 if (!res)143 return -ENODEV;144 145 if (!devm_request_mem_region(&pdev->dev, res->start,146 resource_size(res), DRV_NAME)) {147 pr_err(DRV_NAME ": resources busy\n");148 return -EBUSY;149 }150 151 /* allocate host */152 host = ata_host_alloc(&pdev->dev, 1);153 if (!host)154 return -ENOMEM;155 156 ap = host->ports[0];157 158 if (pdata->explicit_ack)159 ap->ops = &pata_gayle_a1200_ops;160 else161 ap->ops = &pata_gayle_a4000_ops;162 163 ap->pio_mask = ATA_PIO4;164 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;165 166 base = ZTWO_VADDR(pdata->base);167 ap->ioaddr.data_addr = base;168 ap->ioaddr.error_addr = base + 2 + 1 * 4;169 ap->ioaddr.feature_addr = base + 2 + 1 * 4;170 ap->ioaddr.nsect_addr = base + 2 + 2 * 4;171 ap->ioaddr.lbal_addr = base + 2 + 3 * 4;172 ap->ioaddr.lbam_addr = base + 2 + 4 * 4;173 ap->ioaddr.lbah_addr = base + 2 + 5 * 4;174 ap->ioaddr.device_addr = base + 2 + 6 * 4;175 ap->ioaddr.status_addr = base + 2 + 7 * 4;176 ap->ioaddr.command_addr = base + 2 + 7 * 4;177 178 ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL;179 ap->ioaddr.ctl_addr = base + GAYLE_CONTROL;180 181 ap->private_data = (void *)ZTWO_VADDR(pdata->irqport);182 183 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base,184 pdata->base + GAYLE_CONTROL);185 186 ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,187 IRQF_SHARED, &pata_gayle_sht);188 if (ret)189 return ret;190 191 platform_set_drvdata(pdev, host);192 193 return 0;194}195 196static void pata_gayle_remove_one(struct platform_device *pdev)197{198 struct ata_host *host = platform_get_drvdata(pdev);199 200 ata_host_detach(host);201}202 203static struct platform_driver pata_gayle_driver = {204 .probe = pata_gayle_init_one,205 .remove_new = pata_gayle_remove_one,206 .driver = {207 .name = "amiga-gayle-ide",208 },209};210 211module_platform_driver(pata_gayle_driver);212 213MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");214MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");215MODULE_LICENSE("GPL v2");216MODULE_ALIAS("platform:amiga-gayle-ide");217MODULE_VERSION(DRV_VERSION);218