diff options
Diffstat (limited to 'drivers/ata/pata_buddha.c')
| -rw-r--r-- | drivers/ata/pata_buddha.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c new file mode 100644 index 000000000000..11a8044ff633 --- /dev/null +++ b/drivers/ata/pata_buddha.c @@ -0,0 +1,257 @@ +// 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/module.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/ide.h> +#include <asm/setup.h> + +#define DRV_NAME "pata_buddha" +#define DRV_VERSION "0.1.0" + +#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] __initdata = { + BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 +}; + +static unsigned int xsurf_bases[2] __initdata = { + XSURF_BASE1, XSURF_BASE2 +}; + +static 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 __init pata_buddha_init_one(void) +{ + struct zorro_dev *z = NULL; + + while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { + static const char *board_name[] + = { "Buddha", "Catweasel", "X-Surf" }; + struct ata_host *host; + void __iomem *buddha_board; + unsigned long board; + unsigned int type, nr_ports = 2; + int i; + + if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) { + type = BOARD_BUDDHA; + } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) { + type = BOARD_CATWEASEL; + nr_ports++; + } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) { + type = BOARD_XSURF; + } else + continue; + + 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)) + continue; + } else { + if (!devm_request_mem_region(&z->dev, + board + XSURF_BASE1, + 0x1000, DRV_NAME)) + continue; + if (!devm_request_mem_region(&z->dev, + board + XSURF_BASE2, + 0x1000, DRV_NAME)) + continue; + } + + /* allocate host */ + host = ata_host_alloc(&z->dev, nr_ports); + if (!host) + continue; + + 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; +} + +module_init(pata_buddha_init_one); + +MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); +MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(DRV_VERSION); |