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![Max Staudt](/assets/img/avatar_default.png)
Up until now, the pata_buddha driver would only check for cards on initcall time. Now, the kernel will call its probe function as soon as a compatible card is detected. v7: Removed suppress_bind_attrs that slipped in v6: Only do the drvdata workaround for X-Surf (remove breaks otherwise) Style v5: Remove module_exit(): There's no good way to handle the X-Surf hack. Also include a workaround to save X-Surf's drvdata in case zorro8390 is active. v4: Clean up pata_buddha_probe() by using ent->driver_data. Support X-Surf via late_initcall() v3: Clean up devm_*, implement device removal. v2: Rename 'zdev' to 'z' to make the patch easy to analyse with git diff --ignore-space-change Signed-off-by: Max Staudt <max@enpas.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
299 lines
7.5 KiB
C
299 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Buddha, Catweasel and X-Surf PATA controller driver
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*
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* Copyright (c) 2018 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Based on buddha.c:
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*
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* Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
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*/
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#include <linux/ata.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/libata.h>
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#include <linux/mm.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/zorro.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <asm/amigahw.h>
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#include <asm/amigaints.h>
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#include <asm/ide.h>
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#include <asm/setup.h>
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#define DRV_NAME "pata_buddha"
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#define DRV_VERSION "0.1.1"
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#define BUDDHA_BASE1 0x800
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#define BUDDHA_BASE2 0xa00
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#define BUDDHA_BASE3 0xc00
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#define XSURF_BASE1 0xb000 /* 2.5" interface */
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#define XSURF_BASE2 0xd000 /* 3.5" interface */
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#define BUDDHA_CONTROL 0x11a
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#define BUDDHA_IRQ 0xf00
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#define XSURF_IRQ 0x7e
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#define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */
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enum {
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BOARD_BUDDHA = 0,
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BOARD_CATWEASEL,
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BOARD_XSURF
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};
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static unsigned int buddha_bases[3] = {
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BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
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};
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static unsigned int xsurf_bases[2] = {
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XSURF_BASE1, XSURF_BASE2
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};
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static struct scsi_host_template pata_buddha_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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/* FIXME: is this needed? */
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static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,
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unsigned char *buf,
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unsigned int buflen, int rw)
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{
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struct ata_device *dev = qc->dev;
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struct ata_port *ap = dev->link->ap;
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void __iomem *data_addr = ap->ioaddr.data_addr;
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unsigned int words = buflen >> 1;
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/* Transfer multiple of 2 bytes */
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if (rw == READ)
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raw_insw((u16 *)data_addr, (u16 *)buf, words);
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else
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raw_outsw((u16 *)data_addr, (u16 *)buf, words);
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/* Transfer trailing byte, if any. */
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if (unlikely(buflen & 0x01)) {
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unsigned char pad[2] = { };
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/* Point buf to the tail of buffer */
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buf += buflen - 1;
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if (rw == READ) {
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raw_insw((u16 *)data_addr, (u16 *)pad, 1);
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*buf = pad[0];
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} else {
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pad[0] = *buf;
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raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
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}
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words++;
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}
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return words << 1;
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}
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/*
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* Provide our own set_mode() as we don't want to change anything that has
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* already been configured..
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*/
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static int pata_buddha_set_mode(struct ata_link *link,
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struct ata_device **unused)
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{
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struct ata_device *dev;
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ata_for_each_dev(dev, link, ENABLED) {
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/* We don't really care */
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dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
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dev->xfer_shift = ATA_SHIFT_PIO;
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dev->flags |= ATA_DFLAG_PIO;
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ata_dev_info(dev, "configured for PIO\n");
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}
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return 0;
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}
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static bool pata_buddha_irq_check(struct ata_port *ap)
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{
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u8 ch;
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ch = z_readb((unsigned long)ap->private_data);
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return !!(ch & 0x80);
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}
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static void pata_xsurf_irq_clear(struct ata_port *ap)
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{
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z_writeb(0, (unsigned long)ap->private_data);
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}
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static struct ata_port_operations pata_buddha_ops = {
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.inherits = &ata_sff_port_ops,
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.sff_data_xfer = pata_buddha_data_xfer,
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.sff_irq_check = pata_buddha_irq_check,
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.cable_detect = ata_cable_unknown,
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.set_mode = pata_buddha_set_mode,
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};
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static struct ata_port_operations pata_xsurf_ops = {
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.inherits = &ata_sff_port_ops,
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.sff_data_xfer = pata_buddha_data_xfer,
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.sff_irq_check = pata_buddha_irq_check,
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.sff_irq_clear = pata_xsurf_irq_clear,
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.cable_detect = ata_cable_unknown,
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.set_mode = pata_buddha_set_mode,
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};
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static int pata_buddha_probe(struct zorro_dev *z,
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const struct zorro_device_id *ent)
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{
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static const char * const board_name[] = {
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"Buddha", "Catweasel", "X-Surf"
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};
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struct ata_host *host;
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void __iomem *buddha_board;
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unsigned long board;
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unsigned int type = ent->driver_data;
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unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;
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void *old_drvdata;
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int i;
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dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
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board = z->resource.start;
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if (type != BOARD_XSURF) {
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if (!devm_request_mem_region(&z->dev,
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board + BUDDHA_BASE1,
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0x800, DRV_NAME))
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return -ENXIO;
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} else {
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if (!devm_request_mem_region(&z->dev,
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board + XSURF_BASE1,
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0x1000, DRV_NAME))
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return -ENXIO;
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if (!devm_request_mem_region(&z->dev,
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board + XSURF_BASE2,
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0x1000, DRV_NAME)) {
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}
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}
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/* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */
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if (type == BOARD_XSURF)
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old_drvdata = dev_get_drvdata(&z->dev);
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/* allocate host */
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host = ata_host_alloc(&z->dev, nr_ports);
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if (type == BOARD_XSURF)
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dev_set_drvdata(&z->dev, old_drvdata);
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if (!host)
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return -ENXIO;
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buddha_board = ZTWO_VADDR(board);
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/* enable the board IRQ on Buddha/Catweasel */
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if (type != BOARD_XSURF)
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z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
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for (i = 0; i < nr_ports; i++) {
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struct ata_port *ap = host->ports[i];
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void __iomem *base, *irqport;
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unsigned long ctl = 0;
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if (type != BOARD_XSURF) {
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ap->ops = &pata_buddha_ops;
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base = buddha_board + buddha_bases[i];
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ctl = BUDDHA_CONTROL;
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irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
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} else {
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ap->ops = &pata_xsurf_ops;
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base = buddha_board + xsurf_bases[i];
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/* X-Surf has no CS1* (Control/AltStat) */
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irqport = buddha_board + XSURF_IRQ;
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}
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ap->pio_mask = ATA_PIO4;
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ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
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ap->ioaddr.data_addr = base;
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ap->ioaddr.error_addr = base + 2 + 1 * 4;
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ap->ioaddr.feature_addr = base + 2 + 1 * 4;
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ap->ioaddr.nsect_addr = base + 2 + 2 * 4;
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ap->ioaddr.lbal_addr = base + 2 + 3 * 4;
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ap->ioaddr.lbam_addr = base + 2 + 4 * 4;
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ap->ioaddr.lbah_addr = base + 2 + 5 * 4;
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ap->ioaddr.device_addr = base + 2 + 6 * 4;
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ap->ioaddr.status_addr = base + 2 + 7 * 4;
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ap->ioaddr.command_addr = base + 2 + 7 * 4;
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if (ctl) {
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ap->ioaddr.altstatus_addr = base + ctl;
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ap->ioaddr.ctl_addr = base + ctl;
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}
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ap->private_data = (void *)irqport;
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ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
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ctl ? board + buddha_bases[i] + ctl : 0);
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}
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ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
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IRQF_SHARED, &pata_buddha_sht);
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return 0;
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}
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static void pata_buddha_remove(struct zorro_dev *z)
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{
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struct ata_host *host = dev_get_drvdata(&z->dev);
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ata_host_detach(host);
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}
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static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
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{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},
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{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);
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static struct zorro_driver pata_buddha_driver = {
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.name = "pata_buddha",
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.id_table = pata_buddha_zorro_tbl,
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.probe = pata_buddha_probe,
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.remove = pata_buddha_remove,
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};
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/*
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* We cannot have a modalias for X-Surf boards, as it competes with the
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* zorro8390 network driver. As a stopgap measure until we have proper
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* MFD support for this board, we manually attach to it late after Zorro
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* has enumerated its boards.
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*/
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static int __init pata_buddha_late_init(void)
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{
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struct zorro_dev *z = NULL;
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/* Auto-bind to regular boards */
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zorro_register_driver(&pata_buddha_driver);
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/* Manually bind to all X-Surf boards */
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while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {
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static struct zorro_device_id xsurf_ent = {
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ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF
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};
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pata_buddha_probe(z, &xsurf_ent);
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}
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return 0;
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}
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late_initcall(pata_buddha_late_init);
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MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
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MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
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MODULE_LICENSE("GPL v2");
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MODULE_VERSION(DRV_VERSION);
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