linux/drivers/ata/pata_cs5536.c

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/*
* pata_cs5536.c - CS5536 PATA for new ATA layer
* (C) 2007 Martin K. Petersen <mkp@mkp.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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
*
* Documentation:
* Available from AMD web site.
*
* The IDE timing registers for the CS5536 live in the Geode Machine
* Specific Register file and not PCI config space. Most BIOSes
* virtualize the PCI registers so the chip looks like a standard IDE
* controller. Unfortunately not all implementations get this right.
* In particular some have problems with unaligned accesses to the
* virtualized PCI registers. This driver always does full dword
* writes to work around the issue. Also, in case of a bad BIOS this
* driver can be loaded with the "msr=1" parameter which forces using
* the Machine Specific Registers to configure the device.
*/
#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/libata.h>
#include <scsi/scsi_host.h>
#ifdef CONFIG_X86_32
#include <asm/msr.h>
static int use_msr;
module_param_named(msr, use_msr, int, 0644);
MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
#else
#undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */
#undef wrmsr
#define rdmsr(x, y, z) do { } while (0)
#define wrmsr(x, y, z) do { } while (0)
#define use_msr 0
#endif
#define DRV_NAME "pata_cs5536"
#define DRV_VERSION "0.0.8"
enum {
CFG = 0,
DTC = 1,
CAST = 2,
ETC = 3,
MSR_IDE_BASE = 0x51300000,
MSR_IDE_CFG = (MSR_IDE_BASE + 0x10),
MSR_IDE_DTC = (MSR_IDE_BASE + 0x12),
MSR_IDE_CAST = (MSR_IDE_BASE + 0x13),
MSR_IDE_ETC = (MSR_IDE_BASE + 0x14),
PCI_IDE_CFG = 0x40,
PCI_IDE_DTC = 0x48,
PCI_IDE_CAST = 0x4c,
PCI_IDE_ETC = 0x50,
IDE_CFG_CHANEN = 0x2,
IDE_CFG_CABLE = 0x10000,
IDE_D0_SHIFT = 24,
IDE_D1_SHIFT = 16,
IDE_DRV_MASK = 0xff,
IDE_CAST_D0_SHIFT = 6,
IDE_CAST_D1_SHIFT = 4,
IDE_CAST_DRV_MASK = 0x3,
IDE_CAST_CMD_MASK = 0xff,
IDE_CAST_CMD_SHIFT = 24,
IDE_ETC_NODMA = 0x03,
};
static const u32 msr_reg[4] = {
MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC,
};
static const u8 pci_reg[4] = {
PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC,
};
static inline int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
{
if (unlikely(use_msr)) {
u32 dummy __maybe_unused;
rdmsr(msr_reg[reg], *val, dummy);
return 0;
}
return pci_read_config_dword(pdev, pci_reg[reg], val);
}
static inline int cs5536_write(struct pci_dev *pdev, int reg, int val)
{
if (unlikely(use_msr)) {
wrmsr(msr_reg[reg], val, 0);
return 0;
}
return pci_write_config_dword(pdev, pci_reg[reg], val);
}
/**
* cs5536_cable_detect - detect cable type
* @ap: Port to detect on
*
* Perform cable detection for ATA66 capable cable. Return a libata
* cable type.
*/
static int cs5536_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 cfg;
cs5536_read(pdev, CFG, &cfg);
if (cfg & (IDE_CFG_CABLE << ap->port_no))
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* cs5536_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
*/
static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
static const u8 drv_timings[5] = {
0x98, 0x55, 0x32, 0x21, 0x20,
};
static const u8 addr_timings[5] = {
0x2, 0x1, 0x0, 0x0, 0x0,
};
static const u8 cmd_timings[5] = {
0x99, 0x92, 0x90, 0x22, 0x20,
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
struct ata_device *pair = ata_dev_pair(adev);
int mode = adev->pio_mode - XFER_PIO_0;
int cmdmode = mode;
int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
u32 dtc, cast, etc;
if (pair)
cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
cs5536_read(pdev, DTC, &dtc);
cs5536_read(pdev, CAST, &cast);
cs5536_read(pdev, ETC, &etc);
dtc &= ~(IDE_DRV_MASK << dshift);
dtc |= drv_timings[mode] << dshift;
cast &= ~(IDE_CAST_DRV_MASK << cshift);
cast |= addr_timings[mode] << cshift;
cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
etc &= ~(IDE_DRV_MASK << dshift);
etc |= IDE_ETC_NODMA << dshift;
cs5536_write(pdev, DTC, dtc);
cs5536_write(pdev, CAST, cast);
cs5536_write(pdev, ETC, etc);
}
/**
* cs5536_set_dmamode - DMA timing setup
* @ap: ATA interface
* @adev: Device being configured
*
*/
static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const u8 udma_timings[6] = {
0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
};
static const u8 mwdma_timings[3] = {
0x67, 0x21, 0x20,
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 dtc, etc;
int mode = adev->dma_mode;
int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
if (mode >= XFER_UDMA_0) {
cs5536_read(pdev, ETC, &etc);
etc &= ~(IDE_DRV_MASK << dshift);
etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
cs5536_write(pdev, ETC, etc);
} else { /* MWDMA */
cs5536_read(pdev, DTC, &dtc);
dtc &= ~(IDE_DRV_MASK << dshift);
dtc |= mwdma_timings[mode - XFER_MW_DMA_0] << dshift;
cs5536_write(pdev, DTC, dtc);
}
}
static struct scsi_host_template cs5536_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations cs5536_port_ops = {
.inherits = &ata_bmdma32_port_ops,
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 03:22:49 +00:00
.cable_detect = cs5536_cable_detect,
.set_piomode = cs5536_set_piomode,
.set_dmamode = cs5536_set_dmamode,
};
/**
* cs5536_init_one
* @dev: PCI device
* @id: Entry in match table
*
*/
static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &cs5536_port_ops,
};
const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
u32 cfg;
if (use_msr)
printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
cs5536_read(dev, CFG, &cfg);
if ((cfg & IDE_CFG_CHANEN) == 0) {
printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
return -ENODEV;
}
return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
}
static const struct pci_device_id cs5536[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
{ },
};
static struct pci_driver cs5536_pci_driver = {
.name = DRV_NAME,
.id_table = cs5536,
.probe = cs5536_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init cs5536_init(void)
{
return pci_register_driver(&cs5536_pci_driver);
}
static void __exit cs5536_exit(void)
{
pci_unregister_driver(&cs5536_pci_driver);
}
MODULE_AUTHOR("Martin K. Petersen");
MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cs5536);
MODULE_VERSION(DRV_VERSION);
module_init(cs5536_init);
module_exit(cs5536_exit);