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c7087652e1
linux-kernel-test/drivers/ata/pata_pdc2027x.c
Tejun Heo c7087652e1 libata-sff: clean up BMDMA initialization 
When BMDMA initialization failed or BMDMA was not available for
whatever reason, bmdma_addr was left at zero and used as an indication
that BMDMA shouldn't be used.  This leads to the following problems.

p1. For BMDMA drivers which don't use traditional BMDMA register,
    ata_bmdma_mode_filter() incorrectly inhibits DMA modes.  Those
    drivers either have to inherit from ata_sff_port_ops or clear
    ->mode_filter explicitly.

p2. non-BMDMA drivers call into BMDMA PRD table allocation.  It
    doesn't actually allocate PRD table if bmdma_addr is not
    initialized but is still confusing.

p3. For BMDMA drivers which don't use traditional BMDMA register, some
    methods might not be invoked as expected (e.g. bmdma_stop from
    ata_sff_post_internal_cmd()).

p4. SFF drivers w/ custom DMA interface implement noop BMDMA ops
    worrying libata core might call into one of them.

These problems are caused by the muddy line between SFF and BMDMA and
the assumption that all BMDMA controllers initialize bmdma_addr.

This patch fixes p1 and p2 by removing the bmdma_addr assumption and
moving prd allocation to BMDMA port start.  Later patches will fix the
remaining issues.

This patch improves BMDMA initialization such that

* When BMDMA register initialization fails, falls back to PIO instead
  of failing.  ata_pci_bmdma_init() never fails now.

* When ata_pci_bmdma_init() falls back to PIO, it clears
  ap->mwdma_mask and udma_mask instead of depending on
  ata_bmdma_mode_filter().  This makes ata_bmdma_mode_filter()
  unnecessary thus resolving p1.

* ata_port_start() which actually is BMDMA specific is moved to
  ata_bmdma_port_start().  ata_port_start() and ata_sff_port_start()
  are killed.

* ata_sff_port_start32() is moved and renamed to
  ata_bmdma_port_start32().

Drivers which no longer call into PRD table allocation are...

  pdc_adma, sata_inic162x, sata_qstor, sata_sx4, pata_cmd640 and all
  drivers which inherit from ata_sff_port_ops.

pata_icside sets ->port_start to ATA_OP_NULL as it doesn't need PRD
but is a BMDMA controller and doesn't have custom port_start like
other such controllers.

Note that with the previous patch which makes all and only BMDMA
drivers inherit from ata_bmdma_port_ops, this change doesn't break
drivers which need PRD table.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2010-05-19 13:32:19 -04:00

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/*
* Promise PATA TX2/TX4/TX2000/133 IDE driver for pdc20268 to pdc20277.
*
* 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.
*
* Ported to libata by:
* Albert Lee <albertcc@tw.ibm.com> IBM Corporation
*
* Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>
* Portions Copyright (C) 1999 Promise Technology, Inc.
*
* Author: Frank Tiernan (frankt@promise.com)
* Released under terms of General Public License
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware information only available under NDA.
*
*/
#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.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#define DRV_NAME "pata_pdc2027x"
#define DRV_VERSION "1.0"
#undef PDC_DEBUG
#ifdef PDC_DEBUG
#define PDPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
#else
#define PDPRINTK(fmt, args...)
#endif
enum {
PDC_MMIO_BAR = 5,
PDC_UDMA_100 = 0,
PDC_UDMA_133 = 1,
PDC_100_MHZ = 100000000,
PDC_133_MHZ = 133333333,
PDC_SYS_CTL = 0x1100,
PDC_ATA_CTL = 0x1104,
PDC_GLOBAL_CTL = 0x1108,
PDC_CTCR0 = 0x110C,
PDC_CTCR1 = 0x1110,
PDC_BYTE_COUNT = 0x1120,
PDC_PLL_CTL = 0x1202,
};
static int pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline);
static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev);
static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev);
static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc);
static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask);
static int pdc2027x_cable_detect(struct ata_port *ap);
static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed);
/*
* ATA Timing Tables based on 133MHz controller clock.
* These tables are only used when the controller is in 133MHz clock.
* If the controller is in 100MHz clock, the ASIC hardware will
* set the timing registers automatically when "set feature" command
* is issued to the device. However, if the controller clock is 133MHz,
* the following tables must be used.
*/
static struct pdc2027x_pio_timing {
u8 value0, value1, value2;
} pdc2027x_pio_timing_tbl [] = {
{ 0xfb, 0x2b, 0xac }, /* PIO mode 0 */
{ 0x46, 0x29, 0xa4 }, /* PIO mode 1 */
{ 0x23, 0x26, 0x64 }, /* PIO mode 2 */
{ 0x27, 0x0d, 0x35 }, /* PIO mode 3, IORDY on, Prefetch off */
{ 0x23, 0x09, 0x25 }, /* PIO mode 4, IORDY on, Prefetch off */
};
static struct pdc2027x_mdma_timing {
u8 value0, value1;
} pdc2027x_mdma_timing_tbl [] = {
{ 0xdf, 0x5f }, /* MDMA mode 0 */
{ 0x6b, 0x27 }, /* MDMA mode 1 */
{ 0x69, 0x25 }, /* MDMA mode 2 */
};
static struct pdc2027x_udma_timing {
u8 value0, value1, value2;
} pdc2027x_udma_timing_tbl [] = {
{ 0x4a, 0x0f, 0xd5 }, /* UDMA mode 0 */
{ 0x3a, 0x0a, 0xd0 }, /* UDMA mode 1 */
{ 0x2a, 0x07, 0xcd }, /* UDMA mode 2 */
{ 0x1a, 0x05, 0xcd }, /* UDMA mode 3 */
{ 0x1a, 0x03, 0xcd }, /* UDMA mode 4 */
{ 0x1a, 0x02, 0xcb }, /* UDMA mode 5 */
{ 0x1a, 0x01, 0xcb }, /* UDMA mode 6 */
};
static const struct pci_device_id pdc2027x_pci_tbl[] = {
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20268), PDC_UDMA_100 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20269), PDC_UDMA_133 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20270), PDC_UDMA_100 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20271), PDC_UDMA_133 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20275), PDC_UDMA_133 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20276), PDC_UDMA_133 },
{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20277), PDC_UDMA_133 },
{ } /* terminate list */
};
static struct pci_driver pdc2027x_pci_driver = {
.name = DRV_NAME,
.id_table = pdc2027x_pci_tbl,
.probe = pdc2027x_init_one,
.remove = ata_pci_remove_one,
};
static struct scsi_host_template pdc2027x_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations pdc2027x_pata100_ops = {
.inherits = &ata_bmdma_port_ops,
.check_atapi_dma = pdc2027x_check_atapi_dma,
.cable_detect = pdc2027x_cable_detect,
.prereset = pdc2027x_prereset,
};
static struct ata_port_operations pdc2027x_pata133_ops = {
.inherits = &pdc2027x_pata100_ops,
.mode_filter = pdc2027x_mode_filter,
.set_piomode = pdc2027x_set_piomode,
.set_dmamode = pdc2027x_set_dmamode,
.set_mode = pdc2027x_set_mode,
};
static struct ata_port_info pdc2027x_port_info[] = {
/* PDC_UDMA_100 */
{
.flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
ATA_FLAG_MMIO,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &pdc2027x_pata100_ops,
},
/* PDC_UDMA_133 */
{
.flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
ATA_FLAG_MMIO,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &pdc2027x_pata133_ops,
},
};
MODULE_AUTHOR("Andre Hedrick, Frank Tiernan, Albert Lee");
MODULE_DESCRIPTION("libata driver module for Promise PDC20268 to PDC20277");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, pdc2027x_pci_tbl);
/**
* port_mmio - Get the MMIO address of PDC2027x extended registers
* @ap: Port
* @offset: offset from mmio base
*/
static inline void __iomem *port_mmio(struct ata_port *ap, unsigned int offset)
{
return ap->host->iomap[PDC_MMIO_BAR] + ap->port_no * 0x100 + offset;
}
/**
* dev_mmio - Get the MMIO address of PDC2027x extended registers
* @ap: Port
* @adev: device
* @offset: offset from mmio base
*/
static inline void __iomem *dev_mmio(struct ata_port *ap, struct ata_device *adev, unsigned int offset)
{
u8 adj = (adev->devno) ? 0x08 : 0x00;
return port_mmio(ap, offset) + adj;
}
/**
* pdc2027x_pata_cable_detect - Probe host controller cable detect info
* @ap: Port for which cable detect info is desired
*
* Read 80c cable indicator from Promise extended register.
* This register is latched when the system is reset.
*
* LOCKING:
* None (inherited from caller).
*/
static int pdc2027x_cable_detect(struct ata_port *ap)
{
u32 cgcr;
/* check cable detect results */
cgcr = ioread32(port_mmio(ap, PDC_GLOBAL_CTL));
if (cgcr & (1 << 26))
goto cbl40;
PDPRINTK("No cable or 80-conductor cable on port %d\n", ap->port_no);
return ATA_CBL_PATA80;
cbl40:
printk(KERN_INFO DRV_NAME ": 40-conductor cable detected on port %d\n", ap->port_no);
return ATA_CBL_PATA40;
}
/**
* pdc2027x_port_enabled - Check PDC ATA control register to see whether the port is enabled.
* @ap: Port to check
*/
static inline int pdc2027x_port_enabled(struct ata_port *ap)
{
return ioread8(port_mmio(ap, PDC_ATA_CTL)) & 0x02;
}
/**
* pdc2027x_prereset - prereset for PATA host controller
* @link: Target link
* @deadline: deadline jiffies for the operation
*
* Probeinit including cable detection.
*
* LOCKING:
* None (inherited from caller).
*/
static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline)
{
/* Check whether port enabled */
if (!pdc2027x_port_enabled(link->ap))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
/**
* pdc2720x_mode_filter - mode selection filter
* @adev: ATA device
* @mask: list of modes proposed
*
* Block UDMA on devices that cause trouble with this controller.
*/
static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask)
{
unsigned char model_num[ATA_ID_PROD_LEN + 1];
struct ata_device *pair = ata_dev_pair(adev);
if (adev->class != ATA_DEV_ATA || adev->devno == 0 || pair == NULL)
return mask;
/* Check for slave of a Maxtor at UDMA6 */
ata_id_c_string(pair->id, model_num, ATA_ID_PROD,
ATA_ID_PROD_LEN + 1);
/* If the master is a maxtor in UDMA6 then the slave should not use UDMA 6 */
if (strstr(model_num, "Maxtor") == NULL && pair->dma_mode == XFER_UDMA_6)
mask &= ~ (1 << (6 + ATA_SHIFT_UDMA));
return mask;
}
/**
* pdc2027x_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port to configure
* @adev: um
*
* Set PIO mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio = adev->pio_mode - XFER_PIO_0;
u32 ctcr0, ctcr1;
PDPRINTK("adev->pio_mode[%X]\n", adev->pio_mode);
/* Sanity check */
if (pio > 4) {
printk(KERN_ERR DRV_NAME ": Unknown pio mode [%d] ignored\n", pio);
return;
}
/* Set the PIO timing registers using value table for 133MHz */
PDPRINTK("Set pio regs... \n");
ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
ctcr0 &= 0xffff0000;
ctcr0 |= pdc2027x_pio_timing_tbl[pio].value0 |
(pdc2027x_pio_timing_tbl[pio].value1 << 8);
iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
ctcr1 &= 0x00ffffff;
ctcr1 |= (pdc2027x_pio_timing_tbl[pio].value2 << 24);
iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));
PDPRINTK("Set pio regs done\n");
PDPRINTK("Set to pio mode[%u] \n", pio);
}
/**
* pdc2027x_set_dmamode - Initialize host controller PATA UDMA timings
* @ap: Port to configure
* @adev: um
*
* Set UDMA mode for device.
*
* LOCKING:
* None (inherited from caller).
*/
static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
unsigned int dma_mode = adev->dma_mode;
u32 ctcr0, ctcr1;
if ((dma_mode >= XFER_UDMA_0) &&
(dma_mode <= XFER_UDMA_6)) {
/* Set the UDMA timing registers with value table for 133MHz */
unsigned int udma_mode = dma_mode & 0x07;
if (dma_mode == XFER_UDMA_2) {
/*
* Turn off tHOLD.
* If tHOLD is '1', the hardware will add half clock for data hold time.
* This code segment seems to be no effect. tHOLD will be overwritten below.
*/
ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
iowrite32(ctcr1 & ~(1 << 7), dev_mmio(ap, adev, PDC_CTCR1));
}
PDPRINTK("Set udma regs... \n");
ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
ctcr1 &= 0xff000000;
ctcr1 |= pdc2027x_udma_timing_tbl[udma_mode].value0 |
(pdc2027x_udma_timing_tbl[udma_mode].value1 << 8) |
(pdc2027x_udma_timing_tbl[udma_mode].value2 << 16);
iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));
PDPRINTK("Set udma regs done\n");
PDPRINTK("Set to udma mode[%u] \n", udma_mode);
} else if ((dma_mode >= XFER_MW_DMA_0) &&
(dma_mode <= XFER_MW_DMA_2)) {
/* Set the MDMA timing registers with value table for 133MHz */
unsigned int mdma_mode = dma_mode & 0x07;
PDPRINTK("Set mdma regs... \n");
ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
ctcr0 &= 0x0000ffff;
ctcr0 |= (pdc2027x_mdma_timing_tbl[mdma_mode].value0 << 16) |
(pdc2027x_mdma_timing_tbl[mdma_mode].value1 << 24);
iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
PDPRINTK("Set mdma regs done\n");
PDPRINTK("Set to mdma mode[%u] \n", mdma_mode);
} else {
printk(KERN_ERR DRV_NAME ": Unknown dma mode [%u] ignored\n", dma_mode);
}
}
/**
* pdc2027x_set_mode - Set the timing registers back to correct values.
* @link: link to configure
* @r_failed: Returned device for failure
*
* The pdc2027x hardware will look at "SET FEATURES" and change the timing registers
* automatically. The values set by the hardware might be incorrect, under 133Mhz PLL.
* This function overwrites the possibly incorrect values set by the hardware to be correct.
*/
static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed)
{
struct ata_port *ap = link->ap;
struct ata_device *dev;
int rc;
rc = ata_do_set_mode(link, r_failed);
if (rc < 0)
return rc;
ata_for_each_dev(dev, link, ENABLED) {
pdc2027x_set_piomode(ap, dev);
/*
* Enable prefetch if the device support PIO only.
*/
if (dev->xfer_shift == ATA_SHIFT_PIO) {
u32 ctcr1 = ioread32(dev_mmio(ap, dev, PDC_CTCR1));
ctcr1 |= (1 << 25);
iowrite32(ctcr1, dev_mmio(ap, dev, PDC_CTCR1));
PDPRINTK("Turn on prefetch\n");
} else {
pdc2027x_set_dmamode(ap, dev);
}
}
return 0;
}
/**
* pdc2027x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
* @qc: Metadata associated with taskfile to check
*
* LOCKING:
* None (inherited from caller).
*
* RETURNS: 0 when ATAPI DMA can be used
* 1 otherwise
*/
static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
u8 *scsicmd = cmd->cmnd;
int rc = 1; /* atapi dma off by default */
/*
* This workaround is from Promise's GPL driver.
* If ATAPI DMA is used for commands not in the
* following white list, say MODE_SENSE and REQUEST_SENSE,
* pdc2027x might hit the irq lost problem.
*/
switch (scsicmd[0]) {
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
case READ_6:
case WRITE_6:
case 0xad: /* READ_DVD_STRUCTURE */
case 0xbe: /* READ_CD */
/* ATAPI DMA is ok */
rc = 0;
break;
default:
;
}
return rc;
}
/**
* pdc_read_counter - Read the ctr counter
* @host: target ATA host
*/
static long pdc_read_counter(struct ata_host *host)
{
void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
long counter;
int retry = 1;
u32 bccrl, bccrh, bccrlv, bccrhv;
retry:
bccrl = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
bccrh = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
/* Read the counter values again for verification */
bccrlv = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
bccrhv = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
counter = (bccrh << 15) | bccrl;
PDPRINTK("bccrh [%X] bccrl [%X]\n", bccrh, bccrl);
PDPRINTK("bccrhv[%X] bccrlv[%X]\n", bccrhv, bccrlv);
/*
* The 30-bit decreasing counter are read by 2 pieces.
* Incorrect value may be read when both bccrh and bccrl are changing.
* Ex. When 7900 decrease to 78FF, wrong value 7800 might be read.
*/
if (retry && !(bccrh == bccrhv && bccrl >= bccrlv)) {
retry--;
PDPRINTK("rereading counter\n");
goto retry;
}
return counter;
}
/**
* adjust_pll - Adjust the PLL input clock in Hz.
*
* @pdc_controller: controller specific information
* @host: target ATA host
* @pll_clock: The input of PLL in HZ
*/
static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
{
void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
u16 pll_ctl;
long pll_clock_khz = pll_clock / 1000;
long pout_required = board_idx? PDC_133_MHZ:PDC_100_MHZ;
long ratio = pout_required / pll_clock_khz;
int F, R;
/* Sanity check */
if (unlikely(pll_clock_khz < 5000L || pll_clock_khz > 70000L)) {
printk(KERN_ERR DRV_NAME ": Invalid PLL input clock %ldkHz, give up!\n", pll_clock_khz);
return;
}
#ifdef PDC_DEBUG
PDPRINTK("pout_required is %ld\n", pout_required);
/* Show the current clock value of PLL control register
* (maybe already configured by the firmware)
*/
pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
PDPRINTK("pll_ctl[%X]\n", pll_ctl);
#endif
/*
* Calculate the ratio of F, R and OD
* POUT = (F + 2) / (( R + 2) * NO)
*/
if (ratio < 8600L) { /* 8.6x */
/* Using NO = 0x01, R = 0x0D */
R = 0x0d;
} else if (ratio < 12900L) { /* 12.9x */
/* Using NO = 0x01, R = 0x08 */
R = 0x08;
} else if (ratio < 16100L) { /* 16.1x */
/* Using NO = 0x01, R = 0x06 */
R = 0x06;
} else if (ratio < 64000L) { /* 64x */
R = 0x00;
} else {
/* Invalid ratio */
printk(KERN_ERR DRV_NAME ": Invalid ratio %ld, give up!\n", ratio);
return;
}
F = (ratio * (R+2)) / 1000 - 2;
if (unlikely(F < 0 || F > 127)) {
/* Invalid F */
printk(KERN_ERR DRV_NAME ": F[%d] invalid!\n", F);
return;
}
PDPRINTK("F[%d] R[%d] ratio*1000[%ld]\n", F, R, ratio);
pll_ctl = (R << 8) | F;
PDPRINTK("Writing pll_ctl[%X]\n", pll_ctl);
iowrite16(pll_ctl, mmio_base + PDC_PLL_CTL);
ioread16(mmio_base + PDC_PLL_CTL); /* flush */
/* Wait the PLL circuit to be stable */
mdelay(30);
#ifdef PDC_DEBUG
/*
* Show the current clock value of PLL control register
* (maybe configured by the firmware)
*/
pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
PDPRINTK("pll_ctl[%X]\n", pll_ctl);
#endif
return;
}
/**
* detect_pll_input_clock - Detect the PLL input clock in Hz.
* @host: target ATA host
* Ex. 16949000 on 33MHz PCI bus for pdc20275.
* Half of the PCI clock.
*/
static long pdc_detect_pll_input_clock(struct ata_host *host)
{
void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
u32 scr;
long start_count, end_count;
struct timeval start_time, end_time;
long pll_clock, usec_elapsed;
/* Start the test mode */
scr = ioread32(mmio_base + PDC_SYS_CTL);
PDPRINTK("scr[%X]\n", scr);
iowrite32(scr | (0x01 << 14), mmio_base + PDC_SYS_CTL);
ioread32(mmio_base + PDC_SYS_CTL); /* flush */
/* Read current counter value */
start_count = pdc_read_counter(host);
do_gettimeofday(&start_time);
/* Let the counter run for 100 ms. */
mdelay(100);
/* Read the counter values again */
end_count = pdc_read_counter(host);
do_gettimeofday(&end_time);
/* Stop the test mode */
scr = ioread32(mmio_base + PDC_SYS_CTL);
PDPRINTK("scr[%X]\n", scr);
iowrite32(scr & ~(0x01 << 14), mmio_base + PDC_SYS_CTL);
ioread32(mmio_base + PDC_SYS_CTL); /* flush */
/* calculate the input clock in Hz */
usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
(end_time.tv_usec - start_time.tv_usec);
pll_clock = ((start_count - end_count) & 0x3fffffff) / 100 *
(100000000 / usec_elapsed);
PDPRINTK("start[%ld] end[%ld] \n", start_count, end_count);
PDPRINTK("PLL input clock[%ld]Hz\n", pll_clock);
return pll_clock;
}
/**
* pdc_hardware_init - Initialize the hardware.
* @host: target ATA host
* @board_idx: board identifier
*/
static int pdc_hardware_init(struct ata_host *host, unsigned int board_idx)
{
long pll_clock;
/*
* Detect PLL input clock rate.
* On some system, where PCI bus is running at non-standard clock rate.
* Ex. 25MHz or 40MHz, we have to adjust the cycle_time.
* The pdc20275 controller employs PLL circuit to help correct timing registers setting.
*/
pll_clock = pdc_detect_pll_input_clock(host);
dev_printk(KERN_INFO, host->dev, "PLL input clock %ld kHz\n", pll_clock/1000);
/* Adjust PLL control register */
pdc_adjust_pll(host, pll_clock, board_idx);
return 0;
}
/**
* pdc_ata_setup_port - setup the mmio address
* @port: ata ioports to setup
* @base: base address
*/
static void pdc_ata_setup_port(struct ata_ioports *port, void __iomem *base)
{
port->cmd_addr =
port->data_addr = base;
port->feature_addr =
port->error_addr = base + 0x05;
port->nsect_addr = base + 0x0a;
port->lbal_addr = base + 0x0f;
port->lbam_addr = base + 0x10;
port->lbah_addr = base + 0x15;
port->device_addr = base + 0x1a;
port->command_addr =
port->status_addr = base + 0x1f;
port->altstatus_addr =
port->ctl_addr = base + 0x81a;
}
/**
* pdc2027x_init_one - PCI probe function
* Called when an instance of PCI adapter is inserted.
* This function checks whether the hardware is supported,
* initialize hardware and register an instance of ata_host to
* libata. (implements struct pci_driver.probe() )
*
* @pdev: instance of pci_dev found
* @ent: matching entry in the id_tbl[]
*/
static int __devinit pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
static const unsigned long cmd_offset[] = { 0x17c0, 0x15c0 };
static const unsigned long bmdma_offset[] = { 0x1000, 0x1008 };
unsigned int board_idx = (unsigned int) ent->driver_data;
const struct ata_port_info *ppi[] =
{ &pdc2027x_port_info[board_idx], NULL };
struct ata_host *host;
void __iomem *mmio_base;
int i, rc;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
/* alloc host */
host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
if (!host)
return -ENOMEM;
/* acquire resources and fill host */
rc = pcim_enable_device(pdev);
if (rc)
return rc;
rc = pcim_iomap_regions(pdev, 1 << PDC_MMIO_BAR, DRV_NAME);
if (rc)
return rc;
host->iomap = pcim_iomap_table(pdev);
rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
return rc;
rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
if (rc)
return rc;
mmio_base = host->iomap[PDC_MMIO_BAR];
for (i = 0; i < 2; i++) {
struct ata_port *ap = host->ports[i];
pdc_ata_setup_port(&ap->ioaddr, mmio_base + cmd_offset[i]);
ap->ioaddr.bmdma_addr = mmio_base + bmdma_offset[i];
ata_port_pbar_desc(ap, PDC_MMIO_BAR, -1, "mmio");
ata_port_pbar_desc(ap, PDC_MMIO_BAR, cmd_offset[i], "cmd");
}
//pci_enable_intx(pdev);
/* initialize adapter */
if (pdc_hardware_init(host, board_idx) != 0)
return -EIO;
pci_set_master(pdev);
return ata_host_activate(host, pdev->irq, ata_sff_interrupt,
IRQF_SHARED, &pdc2027x_sht);
}
/**
* pdc2027x_init - Called after this module is loaded into the kernel.
*/
static int __init pdc2027x_init(void)
{
return pci_register_driver(&pdc2027x_pci_driver);
}
/**
* pdc2027x_exit - Called before this module unloaded from the kernel
*/
static void __exit pdc2027x_exit(void)
{
pci_unregister_driver(&pdc2027x_pci_driver);
}
module_init(pdc2027x_init);
module_exit(pdc2027x_exit);
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