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linux-next/drivers/ata/pata_atp867x.c
John(Jung-Ik) Lee d15d6e6cc3 libata: Add pata_atp867x driver for Artop/Acard ATP867X controllers 
This is a new pata driver for ARTOP 867X 64bit 4-channel UDMA133 ATA ctrls.
Based on the Atp867 data sheet rev 1.2, Acard, and in part on early ide codes
from Eric Uhrhane <ericu@google.com>.

Signed-off-by: John(Jung-Ik) Lee <jilee@google.com>
Reviewed-by:  Grant Grundler <grundler@google.com>
Reviewed-by:  Gwendal Gringo <gwendal@google.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2009-09-17 16:47:06 -04:00

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/*
* pata_atp867x.c - ARTOP 867X 64bit 4-channel UDMA133 ATA controller driver
*
* (C) 2009 Google Inc. John(Jung-Ik) Lee <jilee@google.com>
*
* Per Atp867 data sheet rev 1.2, Acard.
* Based in part on early ide code from
* 2003-2004 by Eric Uhrhane, Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* TODO:
* 1. RAID features [comparison, XOR, striping, mirroring, etc.]
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_atp867x"
#define DRV_VERSION "0.7.5"
/*
* IO Registers
* Note that all runtime hot priv ports are cached in ap private_data
*/
enum {
ATP867X_IO_CHANNEL_OFFSET = 0x10,
/*
* IO Register Bitfields
*/
ATP867X_IO_PIOSPD_ACTIVE_SHIFT = 4,
ATP867X_IO_PIOSPD_RECOVER_SHIFT = 0,
ATP867X_IO_DMAMODE_MSTR_SHIFT = 0,
ATP867X_IO_DMAMODE_MSTR_MASK = 0x07,
ATP867X_IO_DMAMODE_SLAVE_SHIFT = 4,
ATP867X_IO_DMAMODE_SLAVE_MASK = 0x70,
ATP867X_IO_DMAMODE_UDMA_6 = 0x07,
ATP867X_IO_DMAMODE_UDMA_5 = 0x06,
ATP867X_IO_DMAMODE_UDMA_4 = 0x05,
ATP867X_IO_DMAMODE_UDMA_3 = 0x04,
ATP867X_IO_DMAMODE_UDMA_2 = 0x03,
ATP867X_IO_DMAMODE_UDMA_1 = 0x02,
ATP867X_IO_DMAMODE_UDMA_0 = 0x01,
ATP867X_IO_DMAMODE_DISABLE = 0x00,
ATP867X_IO_SYS_INFO_66MHZ = 0x04,
ATP867X_IO_SYS_INFO_SLOW_UDMA5 = 0x02,
ATP867X_IO_SYS_MASK_RESERVED = (~0xf1),
ATP867X_IO_PORTSPD_VAL = 0x1143,
ATP867X_PREREAD_VAL = 0x0200,
ATP867X_NUM_PORTS = 4,
ATP867X_BAR_IOBASE = 0,
ATP867X_BAR_ROMBASE = 6,
};
#define ATP867X_IOBASE(ap) ((ap)->host->iomap[0])
#define ATP867X_SYS_INFO(ap) (0x3F + ATP867X_IOBASE(ap))
#define ATP867X_IO_PORTBASE(ap, port) (0x00 + ATP867X_IOBASE(ap) + \
(port) * ATP867X_IO_CHANNEL_OFFSET)
#define ATP867X_IO_DMABASE(ap, port) (0x40 + \
ATP867X_IO_PORTBASE((ap), (port)))
#define ATP867X_IO_STATUS(ap, port) (0x07 + \
ATP867X_IO_PORTBASE((ap), (port)))
#define ATP867X_IO_ALTSTATUS(ap, port) (0x0E + \
ATP867X_IO_PORTBASE((ap), (port)))
/*
* hot priv ports
*/
#define ATP867X_IO_MSTRPIOSPD(ap, port) (0x08 + \
ATP867X_IO_DMABASE((ap), (port)))
#define ATP867X_IO_SLAVPIOSPD(ap, port) (0x09 + \
ATP867X_IO_DMABASE((ap), (port)))
#define ATP867X_IO_8BPIOSPD(ap, port) (0x0A + \
ATP867X_IO_DMABASE((ap), (port)))
#define ATP867X_IO_DMAMODE(ap, port) (0x0B + \
ATP867X_IO_DMABASE((ap), (port)))
#define ATP867X_IO_PORTSPD(ap, port) (0x4A + \
ATP867X_IO_PORTBASE((ap), (port)))
#define ATP867X_IO_PREREAD(ap, port) (0x4C + \
ATP867X_IO_PORTBASE((ap), (port)))
struct atp867x_priv {
void __iomem *dma_mode;
void __iomem *mstr_piospd;
void __iomem *slave_piospd;
void __iomem *eightb_piospd;
int pci66mhz;
};
static inline u8 atp867x_speed_to_mode(u8 speed)
{
return speed - XFER_UDMA_0 + 1;
}
static void atp867x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct atp867x_priv *dp = ap->private_data;
u8 speed = adev->dma_mode;
u8 b;
u8 mode;
mode = atp867x_speed_to_mode(speed);
/*
* Doc 6.6.9: decrease the udma mode value by 1 for safer UDMA speed
* on 66MHz bus
* rev-A: UDMA_1~4 (5, 6 no change)
* rev-B: all UDMA modes
* UDMA_0 stays not to disable UDMA
*/
if (dp->pci66mhz && mode > ATP867X_IO_DMAMODE_UDMA_0 &&
(pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B ||
mode < ATP867X_IO_DMAMODE_UDMA_5))
mode--;
b = ioread8(dp->dma_mode);
if (adev->devno & 1) {
b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK) |
(mode << ATP867X_IO_DMAMODE_SLAVE_SHIFT);
} else {
b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK) |
(mode << ATP867X_IO_DMAMODE_MSTR_SHIFT);
}
iowrite8(b, dp->dma_mode);
}
static int atp867x_get_active_clocks_shifted(unsigned int clk)
{
unsigned char clocks = clk;
switch (clocks) {
case 0:
clocks = 1;
break;
case 1 ... 7:
break;
case 8 ... 12:
clocks = 7;
break;
default:
printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
"Using default 8clk.\n", clk);
clocks = 0; /* 8 clk */
break;
}
return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
}
static int atp867x_get_recover_clocks_shifted(unsigned int clk)
{
unsigned char clocks = clk;
switch (clocks) {
case 0:
clocks = 1;
break;
case 1 ... 11:
break;
case 12:
clocks = 0;
break;
case 13: case 14:
--clocks;
break;
case 15:
break;
default:
printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
"Using default 15clk.\n", clk);
clocks = 0; /* 12 clk */
break;
}
return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
}
static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_device *peer = ata_dev_pair(adev);
struct atp867x_priv *dp = ap->private_data;
u8 speed = adev->pio_mode;
struct ata_timing t, p;
int T, UT;
u8 b;
T = 1000000000 / 33333;
UT = T / 4;
ata_timing_compute(adev, speed, &t, T, UT);
if (peer && peer->pio_mode) {
ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
}
b = ioread8(dp->dma_mode);
if (adev->devno & 1)
b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK);
else
b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
iowrite8(b, dp->dma_mode);
b = atp867x_get_active_clocks_shifted(t.active) |
atp867x_get_recover_clocks_shifted(t.recover);
if (dp->pci66mhz)
b += 0x10;
if (adev->devno & 1)
iowrite8(b, dp->slave_piospd);
else
iowrite8(b, dp->mstr_piospd);
/*
* use the same value for comand timing as for PIO timimg
*/
iowrite8(b, dp->eightb_piospd);
}
static int atp867x_cable_detect(struct ata_port *ap)
{
return ATA_CBL_PATA40_SHORT;
}
static struct scsi_host_template atp867x_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations atp867x_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = atp867x_cable_detect,
.set_piomode = atp867x_set_piomode,
.set_dmamode = atp867x_set_dmamode,
};
#ifdef ATP867X_DEBUG
static void atp867x_check_res(struct pci_dev *pdev)
{
int i;
unsigned long start, len;
/* Check the PCI resources for this channel are enabled */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
start = pci_resource_start(pdev, i);
len = pci_resource_len(pdev, i);
printk(KERN_DEBUG "ATP867X: resource start:len=%lx:%lx\n",
start, len);
}
}
static void atp867x_check_ports(struct ata_port *ap, int port)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
struct atp867x_priv *dp = ap->private_data;
printk(KERN_DEBUG "ATP867X: port[%d] addresses\n"
" cmd_addr =0x%llx, 0x%llx\n"
" ctl_addr =0x%llx, 0x%llx\n"
" bmdma_addr =0x%llx, 0x%llx\n"
" data_addr =0x%llx\n"
" error_addr =0x%llx\n"
" feature_addr =0x%llx\n"
" nsect_addr =0x%llx\n"
" lbal_addr =0x%llx\n"
" lbam_addr =0x%llx\n"
" lbah_addr =0x%llx\n"
" device_addr =0x%llx\n"
" status_addr =0x%llx\n"
" command_addr =0x%llx\n"
" dp->dma_mode =0x%llx\n"
" dp->mstr_piospd =0x%llx\n"
" dp->slave_piospd =0x%llx\n"
" dp->eightb_piospd =0x%llx\n"
" dp->pci66mhz =0x%lx\n",
port,
(unsigned long long)ioaddr->cmd_addr,
(unsigned long long)ATP867X_IO_PORTBASE(ap, port),
(unsigned long long)ioaddr->ctl_addr,
(unsigned long long)ATP867X_IO_ALTSTATUS(ap, port),
(unsigned long long)ioaddr->bmdma_addr,
(unsigned long long)ATP867X_IO_DMABASE(ap, port),
(unsigned long long)ioaddr->data_addr,
(unsigned long long)ioaddr->error_addr,
(unsigned long long)ioaddr->feature_addr,
(unsigned long long)ioaddr->nsect_addr,
(unsigned long long)ioaddr->lbal_addr,
(unsigned long long)ioaddr->lbam_addr,
(unsigned long long)ioaddr->lbah_addr,
(unsigned long long)ioaddr->device_addr,
(unsigned long long)ioaddr->status_addr,
(unsigned long long)ioaddr->command_addr,
(unsigned long long)dp->dma_mode,
(unsigned long long)dp->mstr_piospd,
(unsigned long long)dp->slave_piospd,
(unsigned long long)dp->eightb_piospd,
(unsigned long)dp->pci66mhz);
}
#endif
static int atp867x_set_priv(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct atp867x_priv *dp;
int port = ap->port_no;
dp = ap->private_data =
devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
if (dp == NULL)
return -ENOMEM;
dp->dma_mode = ATP867X_IO_DMAMODE(ap, port);
dp->mstr_piospd = ATP867X_IO_MSTRPIOSPD(ap, port);
dp->slave_piospd = ATP867X_IO_SLAVPIOSPD(ap, port);
dp->eightb_piospd = ATP867X_IO_8BPIOSPD(ap, port);
dp->pci66mhz =
ioread8(ATP867X_SYS_INFO(ap)) & ATP867X_IO_SYS_INFO_66MHZ;
return 0;
}
static void atp867x_fixup(struct ata_host *host)
{
struct pci_dev *pdev = to_pci_dev(host->dev);
struct ata_port *ap = host->ports[0];
int i;
u8 v;
/*
* Broken BIOS might not set latency high enough
*/
pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &v);
if (v < 0x80) {
v = 0x80;
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, v);
printk(KERN_DEBUG "ATP867X: set latency timer of device %s"
" to %d\n", pci_name(pdev), v);
}
/*
* init 8bit io ports speed(0aaarrrr) to 43h and
* init udma modes of master/slave to 0/0(11h)
*/
for (i = 0; i < ATP867X_NUM_PORTS; i++)
iowrite16(ATP867X_IO_PORTSPD_VAL, ATP867X_IO_PORTSPD(ap, i));
/*
* init PreREAD counts
*/
for (i = 0; i < ATP867X_NUM_PORTS; i++)
iowrite16(ATP867X_PREREAD_VAL, ATP867X_IO_PREREAD(ap, i));
v = ioread8(ATP867X_IOBASE(ap) + 0x28);
v &= 0xcf; /* Enable INTA#: bit4=0 means enable */
v |= 0xc0; /* Enable PCI burst, MRM & not immediate interrupts */
iowrite8(v, ATP867X_IOBASE(ap) + 0x28);
/*
* Turn off the over clocked udma5 mode, only for Rev-B
*/
v = ioread8(ATP867X_SYS_INFO(ap));
v &= ATP867X_IO_SYS_MASK_RESERVED;
if (pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B)
v |= ATP867X_IO_SYS_INFO_SLOW_UDMA5;
iowrite8(v, ATP867X_SYS_INFO(ap));
}
static int atp867x_ata_pci_sff_init_host(struct ata_host *host)
{
struct device *gdev = host->dev;
struct pci_dev *pdev = to_pci_dev(gdev);
unsigned int mask = 0;
int i, rc;
/*
* do not map rombase
*/
rc = pcim_iomap_regions(pdev, 1 << ATP867X_BAR_IOBASE, DRV_NAME);
if (rc == -EBUSY)
pcim_pin_device(pdev);
if (rc)
return rc;
host->iomap = pcim_iomap_table(pdev);
#ifdef ATP867X_DEBUG
atp867x_check_res(pdev);
for (i = 0; i < PCI_ROM_RESOURCE; i++)
printk(KERN_DEBUG "ATP867X: iomap[%d]=0x%llx\n", i,
(unsigned long long)(host->iomap[i]));
#endif
/*
* request, iomap BARs and init port addresses accordingly
*/
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
struct ata_ioports *ioaddr = &ap->ioaddr;
ioaddr->cmd_addr = ATP867X_IO_PORTBASE(ap, i);
ioaddr->ctl_addr = ioaddr->altstatus_addr
= ATP867X_IO_ALTSTATUS(ap, i);
ioaddr->bmdma_addr = ATP867X_IO_DMABASE(ap, i);
ata_sff_std_ports(ioaddr);
rc = atp867x_set_priv(ap);
if (rc)
return rc;
#ifdef ATP867X_DEBUG
atp867x_check_ports(ap, i);
#endif
ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
(unsigned long)ioaddr->cmd_addr,
(unsigned long)ioaddr->ctl_addr);
ata_port_desc(ap, "bmdma 0x%lx",
(unsigned long)ioaddr->bmdma_addr);
mask |= 1 << i;
}
if (!mask) {
dev_printk(KERN_ERR, gdev, "no available native port\n");
return -ENODEV;
}
atp867x_fixup(host);
rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
return rc;
rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
return rc;
}
static int atp867x_init_one(struct pci_dev *pdev,
const struct pci_device_id *id)
{
static int printed_version;
static const struct ata_port_info info_867x = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &atp867x_ops,
};
struct ata_host *host;
const struct ata_port_info *ppi[] = { &info_867x, NULL };
int rc;
if (!printed_version++)
dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
rc = pcim_enable_device(pdev);
if (rc)
return rc;
printk(KERN_INFO "ATP867X: ATP867 ATA UDMA133 controller (rev %02X)",
pdev->device);
host = ata_host_alloc_pinfo(&pdev->dev, ppi, ATP867X_NUM_PORTS);
if (!host) {
dev_printk(KERN_ERR, &pdev->dev,
"failed to allocate ATA host\n");
rc = -ENOMEM;
goto err_out;
}
rc = atp867x_ata_pci_sff_init_host(host);
if (rc) {
dev_printk(KERN_ERR, &pdev->dev, "failed to init host\n");
goto err_out;
}
pci_set_master(pdev);
rc = ata_host_activate(host, pdev->irq, ata_sff_interrupt,
IRQF_SHARED, &atp867x_sht);
if (rc)
dev_printk(KERN_ERR, &pdev->dev, "failed to activate host\n");
err_out:
return rc;
}
static struct pci_device_id atp867x_pci_tbl[] = {
{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867A), 0 },
{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867B), 0 },
{ },
};
static struct pci_driver atp867x_driver = {
.name = DRV_NAME,
.id_table = atp867x_pci_tbl,
.probe = atp867x_init_one,
.remove = ata_pci_remove_one,
};
static int __init atp867x_init(void)
{
return pci_register_driver(&atp867x_driver);
}
static void __exit atp867x_exit(void)
{
pci_unregister_driver(&atp867x_driver);
}
MODULE_AUTHOR("John(Jung-Ik) Lee, Google Inc.");
MODULE_DESCRIPTION("low level driver for Artop/Acard 867x ATA controller");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, atp867x_pci_tbl);
MODULE_VERSION(DRV_VERSION);
module_init(atp867x_init);
module_exit(atp867x_exit);
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