// SPDX-License-Identifier: GPL-2.0
/*
* Buddha, Catweasel and X-Surf PATA controller driver
*
* Copyright (c) 2018 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Based on buddha.c:
*
* Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
*/
#include <linux/ata.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/mm.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/zorro.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/setup.h>
#define DRV_NAME "pata_buddha"
#define DRV_VERSION "0.1.1"
#define BUDDHA_BASE1 0x800
#define BUDDHA_BASE2 0xa00
#define BUDDHA_BASE3 0xc00
#define XSURF_BASE1 0xb000 /* 2.5" interface */
#define XSURF_BASE2 0xd000 /* 3.5" interface */
#define BUDDHA_CONTROL 0x11a
#define BUDDHA_IRQ 0xf00
#define XSURF_IRQ 0x7e
#define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */
enum {
BOARD_BUDDHA = 0,
BOARD_CATWEASEL,
BOARD_XSURF
};
static unsigned int buddha_bases[3] = {
BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
};
static unsigned int xsurf_bases[2] = {
XSURF_BASE1, XSURF_BASE2
};
static const struct scsi_host_template pata_buddha_sht = {
ATA_PIO_SHT(DRV_NAME),
};
/* FIXME: is this needed? */
static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,
unsigned char *buf,
unsigned int buflen, int rw)
{
struct ata_device *dev = qc->dev;
struct ata_port *ap = dev->link->ap;
void __iomem *data_addr = ap->ioaddr.data_addr;
unsigned int words = buflen >> 1;
/* Transfer multiple of 2 bytes */
if (rw == READ)
raw_insw((u16 *)data_addr, (u16 *)buf, words);
else
raw_outsw((u16 *)data_addr, (u16 *)buf, words);
/* Transfer trailing byte, if any. */
if (unlikely(buflen & 0x01)) {
unsigned char pad[2] = { };
/* Point buf to the tail of buffer */
buf += buflen - 1;
if (rw == READ) {
raw_insw((u16 *)data_addr, (u16 *)pad, 1);
*buf = pad[0];
} else {
pad[0] = *buf;
raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
}
words++;
}
return words << 1;
}
/*
* Provide our own set_mode() as we don't want to change anything that has
* already been configured..
*/
static int pata_buddha_set_mode(struct ata_link *link,
struct ata_device **unused)
{
struct ata_device *dev;
ata_for_each_dev(dev, link, ENABLED) {
/* We don't really care */
dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
ata_dev_info(dev, "configured for PIO\n");
}
return 0;
}
static bool pata_buddha_irq_check(struct ata_port *ap)
{
u8 ch;
ch = z_readb((unsigned long)ap->private_data);
return !!(ch & 0x80);
}
static void pata_xsurf_irq_clear(struct ata_port *ap)
{
z_writeb(0, (unsigned long)ap->private_data);
}
static struct ata_port_operations pata_buddha_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = pata_buddha_data_xfer,
.sff_irq_check = pata_buddha_irq_check,
.cable_detect = ata_cable_unknown,
.set_mode = pata_buddha_set_mode,
};
static struct ata_port_operations pata_xsurf_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = pata_buddha_data_xfer,
.sff_irq_check = pata_buddha_irq_check,
.sff_irq_clear = pata_xsurf_irq_clear,
.cable_detect = ata_cable_unknown,
.set_mode = pata_buddha_set_mode,
};
static int pata_buddha_probe(struct zorro_dev *z,
const struct zorro_device_id *ent)
{
static const char * const board_name[] = {
"Buddha", "Catweasel", "X-Surf"
};
struct ata_host *host;
void __iomem *buddha_board;
unsigned long board;
unsigned int type = ent->driver_data;
unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;
void *old_drvdata;
int i;
dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
board = z->resource.start;
if (type != BOARD_XSURF) {
if (!devm_request_mem_region(&z->dev,
board + BUDDHA_BASE1,
0x800, DRV_NAME))
return -ENXIO;
} else {
if (!devm_request_mem_region(&z->dev,
board + XSURF_BASE1,
0x1000, DRV_NAME))
return -ENXIO;
if (!devm_request_mem_region(&z->dev,
board + XSURF_BASE2,
0x1000, DRV_NAME)) {
}
}
/* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */
if (type == BOARD_XSURF)
old_drvdata = dev_get_drvdata(&z->dev);
/* allocate host */
host = ata_host_alloc(&z->dev, nr_ports);
if (type == BOARD_XSURF)
dev_set_drvdata(&z->dev, old_drvdata);
if (!host)
return -ENXIO;
buddha_board = ZTWO_VADDR(board);
/* enable the board IRQ on Buddha/Catweasel */
if (type != BOARD_XSURF)
z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
for (i = 0; i < nr_ports; i++) {
struct ata_port *ap = host->ports[i];
void __iomem *base, *irqport;
unsigned long ctl = 0;
if (type != BOARD_XSURF) {
ap->ops = &pata_buddha_ops;
base = buddha_board + buddha_bases[i];
ctl = BUDDHA_CONTROL;
irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
} else {
ap->ops = &pata_xsurf_ops;
base = buddha_board + xsurf_bases[i];
/* X-Surf has no CS1* (Control/AltStat) */
irqport = buddha_board + XSURF_IRQ;
}
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
ap->ioaddr.data_addr = base;
ap->ioaddr.error_addr = base + 2 + 1 * 4;
ap->ioaddr.feature_addr = base + 2 + 1 * 4;
ap->ioaddr.nsect_addr = base + 2 + 2 * 4;
ap->ioaddr.lbal_addr = base + 2 + 3 * 4;
ap->ioaddr.lbam_addr = base + 2 + 4 * 4;
ap->ioaddr.lbah_addr = base + 2 + 5 * 4;
ap->ioaddr.device_addr = base + 2 + 6 * 4;
ap->ioaddr.status_addr = base + 2 + 7 * 4;
ap->ioaddr.command_addr = base + 2 + 7 * 4;
if (ctl) {
ap->ioaddr.altstatus_addr = base + ctl;
ap->ioaddr.ctl_addr = base + ctl;
}
ap->private_data = (void *)irqport;
ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
ctl ? board + buddha_bases[i] + ctl : 0);
}
ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
IRQF_SHARED, &pata_buddha_sht);
return 0;
}
static void pata_buddha_remove(struct zorro_dev *z)
{
struct ata_host *host = dev_get_drvdata(&z->dev);
ata_host_detach(host);
}
static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},
{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},
{ 0 }
};
MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);
static struct zorro_driver pata_buddha_driver = {
.name = "pata_buddha",
.id_table = pata_buddha_zorro_tbl,
.probe = pata_buddha_probe,
.remove = pata_buddha_remove,
};
/*
* We cannot have a modalias for X-Surf boards, as it competes with the
* zorro8390 network driver. As a stopgap measure until we have proper
* MFD support for this board, we manually attach to it late after Zorro
* has enumerated its boards.
*/
static int __init pata_buddha_late_init(void)
{
struct zorro_dev *z = NULL;
/* Auto-bind to regular boards */
zorro_register_driver(&pata_buddha_driver);
/* Manually bind to all X-Surf boards */
while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {
static struct zorro_device_id xsurf_ent = {
ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF
};
pata_buddha_probe(z, &xsurf_ent);
}
return 0;
}
late_initcall(pata_buddha_late_init);
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
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