2011-11-24 12:43:51 +00:00
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/*
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* Copyright (C) 2011 Juergen Beisert, Pengutronix
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*
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* Derived from the Linux kernel: Generic platform device PATA driver
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* Copyright (C) 2006 - 2007 Paul Mundt
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* Based on pata_pcmcia:
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* Copyright 2005-2006 Red Hat Inc, all rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <init.h>
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#include <xfuncs.h>
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#include <malloc.h>
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#include <errno.h>
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#include <ata_drive.h>
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#include <platform_ide.h>
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/**
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* Setup the register specific addresses for an ATA like divice
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* @param reg_base Base address of the standard ATA like registers
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* @param alt_base Base address of the alternate ATA like registers
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* @param ioaddr Register file structure to setup
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* @param shift Shift offset between registers
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*
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* Some of the registers have different names but use the same offset. This is
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* due to the fact read or write access at the same offset reaches different
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* registers.
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*/
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static void platform_ide_setup_port(void *reg_base, void *alt_base,
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struct ata_ioports *ioaddr, unsigned shift)
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{
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/* standard registers (0 ... 7) */
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ioaddr->cmd_addr = reg_base;
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ioaddr->data_addr = reg_base + (IDE_REG_DATA << shift);
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ioaddr->error_addr = reg_base + (IDE_REG_ERR << shift);
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ioaddr->feature_addr = reg_base + (IDE_REG_FEATURE << shift);
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ioaddr->nsect_addr = reg_base + (IDE_REG_NSECT << shift);
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ioaddr->lbal_addr = reg_base + (IDE_REG_LBAL << shift);
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ioaddr->lbam_addr = reg_base + (IDE_REG_LBAM << shift);
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ioaddr->lbah_addr = reg_base + (IDE_REG_LBAH << shift);
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ioaddr->device_addr = reg_base + (IDE_REG_DEVICE << shift);
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ioaddr->status_addr = reg_base + (IDE_REG_STATUS << shift);
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ioaddr->command_addr = reg_base + (IDE_REG_CMD << shift);
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2012-04-18 18:25:10 +00:00
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if (alt_base) {
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ioaddr->altstatus_addr = alt_base + (IDE_REG_ALT_STATUS << shift);
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ioaddr->ctl_addr = alt_base + (IDE_REG_DEV_CTL << shift);
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2011-11-24 12:43:51 +00:00
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2012-04-18 18:25:10 +00:00
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ioaddr->alt_dev_addr = alt_base + (IDE_REG_DRV_ADDR << shift);
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} else {
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ioaddr->altstatus_addr = ioaddr->status_addr;
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ioaddr->ctl_addr = ioaddr->status_addr;
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/* ioaddr->alt_dev_addr not used in driver */
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}
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2011-11-24 12:43:51 +00:00
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}
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static int platform_ide_probe(struct device_d *dev)
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{
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int rc;
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struct ide_port_info *pdata = dev->platform_data;
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struct ata_ioports *io;
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void *reg_base, *alt_base;
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if (pdata == NULL) {
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dev_err(dev, "No platform data. Cannot continue\n");
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return -EINVAL;
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}
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io = xzalloc(sizeof(struct ata_ioports));
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reg_base = dev_request_mem_region(dev, 0);
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alt_base = dev_request_mem_region(dev, 1);
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platform_ide_setup_port(reg_base, alt_base, io, pdata->ioport_shift);
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io->reset = pdata->reset;
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io->dataif_be = pdata->dataif_be;
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rc = register_ata_drive(dev, io);
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if (rc != 0) {
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dev_err(dev, "Cannot register IDE interface\n");
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free(io);
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}
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return rc;
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}
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static struct driver_d platform_ide_driver = {
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.name = "ide_intf",
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.probe = platform_ide_probe,
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};
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static int platform_ide_init(void)
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{
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return register_driver(&platform_ide_driver);
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}
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device_initcall(platform_ide_init);
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/**
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* @file
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* @brief Interface driver for an ATA drive behind an IDE like interface
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*
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* This communication driver does all accesses to the drive via memory IO
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* instructions.
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*
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* This kind of interface is also useable for regular bus like access, when
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* there is no dedicated IDE available.
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*
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* "IDE like" means the platform data defines addresses to the register file
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* of the attached ATA drive.
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*
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* This driver does not change any access timings due to the fact it has no idea
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* how to do so. So, do not expect an impressive data throughput.
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*
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* @todo Support also the IO port access method, the x86 architecture is using
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*/
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