From 7e11aabd48eb00240b280bf927cba9198664dcf6 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Fri, 30 Dec 2016 15:01:18 +0100 Subject: ata: add Atari Falcon PATA controller driver Add Atari Falcon PATA controller driver. The major difference when compared to legacy IDE's falconide host driver is that we are using polled PIO mode and thus avoiding the need for STDMA locking magic altogether. Tested under ARAnyM emulator. Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Tejun Heo --- drivers/ata/Kconfig | 9 +++ drivers/ata/Makefile | 1 + drivers/ata/pata_falcon.c | 184 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 194 insertions(+) create mode 100644 drivers/ata/pata_falcon.c (limited to 'drivers/ata') diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index 702b3514020c..78c002021029 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -902,6 +902,15 @@ config PATA_CMD640_PCI If unsure, say N. +config PATA_FALCON + tristate "Atari Falcon PATA support" + depends on M68K && ATARI + help + This option enables support for the on-board IDE + interface on the Atari Falcon. + + If unsure, say N. + config PATA_ISAPNP tristate "ISA Plug and Play PATA support" depends on ISAPNP diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index a46e6b784bda..89a0a1915d36 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c105.o obj-$(CONFIG_PATA_AT32) += pata_at32.o obj-$(CONFIG_PATA_AT91) += pata_at91.o obj-$(CONFIG_PATA_CMD640_PCI) += pata_cmd640.o +obj-$(CONFIG_PATA_FALCON) += pata_falcon.o obj-$(CONFIG_PATA_ISAPNP) += pata_isapnp.o obj-$(CONFIG_PATA_IXP4XX_CF) += pata_ixp4xx_cf.o obj-$(CONFIG_PATA_MPIIX) += pata_mpiix.o diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c new file mode 100644 index 000000000000..78264082a4cf --- /dev/null +++ b/drivers/ata/pata_falcon.c @@ -0,0 +1,184 @@ +/* + * Atari Falcon PATA controller driver + * + * Copyright (c) 2016 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Based on falconide.c: + * + * Created 12 Jul 1997 by Geert Uytterhoeven + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#define DRV_NAME "pata_falcon" +#define DRV_VERSION "0.1.0" + +#define ATA_HD_BASE 0xfff00000 +#define ATA_HD_CONTROL 0x39 + +static struct scsi_host_template pata_falcon_sht = { + ATA_PIO_SHT(DRV_NAME), +}; + +static unsigned int pata_falcon_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; + struct scsi_cmnd *cmd = qc->scsicmd; + bool swap = 1; + + if (dev->class == ATA_DEV_ATA && cmd && cmd->request && + cmd->request->cmd_type == REQ_TYPE_FS) + swap = 0; + + /* Transfer multiple of 2 bytes */ + if (rw == READ) { + if (swap) + raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words); + else + raw_insw((u16 *)data_addr, (u16 *)buf, words); + } else { + if (swap) + raw_outsw_swapw((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) { + if (swap) + raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1); + else + raw_insw((u16 *)data_addr, (u16 *)pad, 1); + *buf = pad[0]; + } else { + pad[0] = *buf; + if (swap) + raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1); + else + 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_falcon_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 struct ata_port_operations pata_falcon_ops = { + .inherits = &ata_sff_port_ops, + .sff_data_xfer = pata_falcon_data_xfer, + .cable_detect = ata_cable_unknown, + .set_mode = pata_falcon_set_mode, +}; + +static int pata_falcon_init_one(void) +{ + struct ata_host *host; + struct ata_port *ap; + struct platform_device *pdev; + void __iomem *base; + + if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE)) + return -ENODEV; + + pr_info(DRV_NAME ": Atari Falcon PATA controller\n"); + + pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) { + pr_err(DRV_NAME ": resources busy\n"); + return -EBUSY; + } + + /* allocate host */ + host = ata_host_alloc(&pdev->dev, 1); + if (!host) + return -ENOMEM; + ap = host->ports[0]; + + ap->ops = &pata_falcon_ops; + ap->pio_mask = ATA_PIO4; + ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; + ap->flags |= ATA_FLAG_PIO_POLLING; + + base = (void __iomem *)ATA_HD_BASE; + ap->ioaddr.data_addr = base; + ap->ioaddr.error_addr = base + 1 + 1 * 4; + ap->ioaddr.feature_addr = base + 1 + 1 * 4; + ap->ioaddr.nsect_addr = base + 1 + 2 * 4; + ap->ioaddr.lbal_addr = base + 1 + 3 * 4; + ap->ioaddr.lbam_addr = base + 1 + 4 * 4; + ap->ioaddr.lbah_addr = base + 1 + 5 * 4; + ap->ioaddr.device_addr = base + 1 + 6 * 4; + ap->ioaddr.status_addr = base + 1 + 7 * 4; + ap->ioaddr.command_addr = base + 1 + 7 * 4; + + ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL; + ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL; + + ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base, + (unsigned long)base + ATA_HD_CONTROL); + + /* activate */ + return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht); +} + +module_init(pata_falcon_init_one); + +MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); +MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); -- cgit v1.2.3