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1// SPDX-License-Identifier: GPL-2.02 3/*4 * Atari Falcon PATA controller driver5 *6 * Copyright (c) 2016 Samsung Electronics Co., Ltd.7 * http://www.samsung.com8 *9 * Based on falconide.c:10 *11 * Created 12 Jul 1997 by Geert Uytterhoeven12 */13 14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/init.h>17#include <linux/blkdev.h>18#include <linux/delay.h>19#include <scsi/scsi_host.h>20#include <scsi/scsi_cmnd.h>21#include <linux/ata.h>22#include <linux/libata.h>23#include <linux/mm.h>24#include <linux/interrupt.h>25#include <linux/platform_device.h>26 27#include <asm/setup.h>28#include <asm/atarihw.h>29#include <asm/atariints.h>30#include <asm/atari_stdma.h>31 32#define DRV_NAME "pata_falcon"33#define DRV_VERSION "0.1.0"34 35static int pata_falcon_swap_mask;36 37module_param_named(data_swab, pata_falcon_swap_mask, int, 0444);38MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)");39 40static const struct scsi_host_template pata_falcon_sht = {41 ATA_PIO_SHT(DRV_NAME),42};43 44static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,45 unsigned char *buf,46 unsigned int buflen, int rw)47{48 struct ata_device *dev = qc->dev;49 struct ata_port *ap = dev->link->ap;50 void __iomem *data_addr = ap->ioaddr.data_addr;51 unsigned int words = buflen >> 1;52 struct scsi_cmnd *cmd = qc->scsicmd;53 bool swap = 1;54 55 if (dev->class == ATA_DEV_ATA && cmd &&56 !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))57 swap = (uintptr_t)ap->private_data & BIT(dev->devno);58 59 /* Transfer multiple of 2 bytes */60 if (rw == READ) {61 if (swap)62 raw_insw_swapw(data_addr, (u16 *)buf, words);63 else64 raw_insw(data_addr, (u16 *)buf, words);65 } else {66 if (swap)67 raw_outsw_swapw(data_addr, (u16 *)buf, words);68 else69 raw_outsw(data_addr, (u16 *)buf, words);70 }71 72 /* Transfer trailing byte, if any. */73 if (unlikely(buflen & 0x01)) {74 unsigned char pad[2] = { };75 76 /* Point buf to the tail of buffer */77 buf += buflen - 1;78 79 if (rw == READ) {80 if (swap)81 raw_insw_swapw(data_addr, (u16 *)pad, 1);82 else83 raw_insw(data_addr, (u16 *)pad, 1);84 *buf = pad[0];85 } else {86 pad[0] = *buf;87 if (swap)88 raw_outsw_swapw(data_addr, (u16 *)pad, 1);89 else90 raw_outsw(data_addr, (u16 *)pad, 1);91 }92 words++;93 }94 95 return words << 1;96}97 98/*99 * Provide our own set_mode() as we don't want to change anything that has100 * already been configured..101 */102static int pata_falcon_set_mode(struct ata_link *link,103 struct ata_device **unused)104{105 struct ata_device *dev;106 107 ata_for_each_dev(dev, link, ENABLED) {108 /* We don't really care */109 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;110 dev->xfer_shift = ATA_SHIFT_PIO;111 dev->flags |= ATA_DFLAG_PIO;112 ata_dev_info(dev, "configured for PIO\n");113 }114 return 0;115}116 117static struct ata_port_operations pata_falcon_ops = {118 .inherits = &ata_sff_port_ops,119 .sff_data_xfer = pata_falcon_data_xfer,120 .cable_detect = ata_cable_unknown,121 .set_mode = pata_falcon_set_mode,122};123 124static int pata_falcon_init_one(struct platform_device *pdev)125{126 struct resource *base_mem_res, *ctl_mem_res;127 struct resource *base_res, *ctl_res, *irq_res;128 struct ata_host *host;129 struct ata_port *ap;130 void __iomem *base, *ctl_base;131 int mask_shift = 0; /* Q40 & Falcon default */132 int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */133 134 dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");135 136 base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);137 if (base_res && !devm_request_region(&pdev->dev, base_res->start,138 resource_size(base_res), DRV_NAME)) {139 dev_err(&pdev->dev, "resources busy\n");140 return -EBUSY;141 }142 143 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);144 if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,145 resource_size(ctl_res), DRV_NAME)) {146 dev_err(&pdev->dev, "resources busy\n");147 return -EBUSY;148 }149 150 base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);151 if (!base_mem_res)152 return -ENODEV;153 if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,154 resource_size(base_mem_res), DRV_NAME)) {155 dev_err(&pdev->dev, "resources busy\n");156 return -EBUSY;157 }158 159 ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);160 if (!ctl_mem_res)161 return -ENODEV;162 163 /* allocate host */164 host = ata_host_alloc(&pdev->dev, 1);165 if (!host)166 return -ENOMEM;167 ap = host->ports[0];168 169 ap->ops = &pata_falcon_ops;170 ap->pio_mask = ATA_PIO4;171 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;172 173 /* N.B. this assumes data_addr will be used for word-sized I/O only */174 ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;175 176 if (base_res) { /* only Q40 has IO resources */177 io_offset = 0x10000;178 reg_shift = 0;179 base = (void __iomem *)base_res->start;180 ctl_base = (void __iomem *)ctl_res->start;181 } else {182 base = (void __iomem *)base_mem_res->start;183 ctl_base = (void __iomem *)ctl_mem_res->start;184 }185 186 ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift);187 ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);188 ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift);189 ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift);190 ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift);191 ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift);192 ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift);193 ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift);194 ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);195 196 ap->ioaddr.altstatus_addr = ctl_base + io_offset;197 ap->ioaddr.ctl_addr = ctl_base + io_offset;198 199 ata_port_desc(ap, "cmd %px ctl %px data %px",200 base, ctl_base, ap->ioaddr.data_addr);201 202 if (pdev->id > 0)203 mask_shift = 2;204 ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift);205 206 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);207 if (irq_res && irq_res->start > 0) {208 irq = irq_res->start;209 } else {210 ap->flags |= ATA_FLAG_PIO_POLLING;211 ata_port_desc(ap, "no IRQ, using PIO polling");212 }213 214 /* activate */215 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,216 IRQF_SHARED, &pata_falcon_sht);217}218 219static void pata_falcon_remove_one(struct platform_device *pdev)220{221 struct ata_host *host = platform_get_drvdata(pdev);222 223 ata_host_detach(host);224}225 226static struct platform_driver pata_falcon_driver = {227 .probe = pata_falcon_init_one,228 .remove_new = pata_falcon_remove_one,229 .driver = {230 .name = "atari-falcon-ide",231 },232};233 234module_platform_driver(pata_falcon_driver);235 236MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");237MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");238MODULE_LICENSE("GPL v2");239MODULE_ALIAS("platform:atari-falcon-ide");240MODULE_VERSION(DRV_VERSION);241