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linux-sg2042/drivers/ata/pata_pdc2027x.c

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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 "0.9"
#undef PDC_DEBUG
#ifdef PDC_DEBUG
#define PDPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## 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 void pdc2027x_error_handler(struct ata_port *ap);
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_port *ap, 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 = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations pdc2027x_pata100_ops = {
.port_disable = ata_port_disable,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.check_atapi_dma = pdc2027x_check_atapi_dma,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = pdc2027x_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = pdc2027x_cable_detect,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = ata_port_start,
};
static struct ata_port_operations pdc2027x_pata133_ops = {
.port_disable = ata_port_disable,
.set_piomode = pdc2027x_set_piomode,
.set_dmamode = pdc2027x_set_dmamode,
.set_mode = pdc2027x_set_mode,
.mode_filter = pdc2027x_mode_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.check_atapi_dma = pdc2027x_check_atapi_dma,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = pdc2027x_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = pdc2027x_cable_detect,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = ata_port_start,
};
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 = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = ATA_UDMA5, /* udma0-5 */
.port_ops = &pdc2027x_pata100_ops,
},
/* PDC_UDMA_133 */
{
.flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
ATA_FLAG_MMIO,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = ATA_UDMA6, /* udma0-6 */
.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 = readl(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 readb(port_mmio(ap, PDC_ATA_CTL)) & 0x02;
}
/**
* pdc2027x_prereset - prereset for PATA host controller
* @ap: Target port
* @deadline: deadline jiffies for the operation
*
* Probeinit including cable detection.
*
* LOCKING:
* None (inherited from caller).
*/
static int pdc2027x_prereset(struct ata_port *ap, unsigned long deadline)
{
/* Check whether port enabled */
if (!pdc2027x_port_enabled(ap))
return -ENOENT;
return ata_std_prereset(ap, deadline);
}
/**
* pdc2027x_error_handler - Perform reset on PATA port and classify
* @ap: Port to reset
*
* Reset PATA phy and classify attached devices.
*
* LOCKING:
* None (inherited from caller).
*/
static void pdc2027x_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, pdc2027x_prereset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* 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 ata_pci_default_filter(adev, 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") == 0 && pair->dma_mode == XFER_UDMA_6)
mask &= ~ (1 << (6 + ATA_SHIFT_UDMA));
return ata_pci_default_filter(adev, mask);
}
/**
* pdc2027x_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port to configure
* @adev: um
* @pio: PIO mode, 0 - 4
*
* 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 = readl(dev_mmio(ap, adev, PDC_CTCR0));
ctcr0 &= 0xffff0000;
ctcr0 |= pdc2027x_pio_timing_tbl[pio].value0 |
(pdc2027x_pio_timing_tbl[pio].value1 << 8);
writel(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
ctcr1 = readl(dev_mmio(ap, adev, PDC_CTCR1));
ctcr1 &= 0x00ffffff;
ctcr1 |= (pdc2027x_pio_timing_tbl[pio].value2 << 24);
writel(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
* @udma: udma mode, XFER_UDMA_0 to XFER_UDMA_6
*
* 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 = readl(dev_mmio(ap, adev, PDC_CTCR1));
writel(ctcr1 & ~(1 << 7), dev_mmio(ap, adev, PDC_CTCR1));
}
PDPRINTK("Set udma regs... \n");
ctcr1 = readl(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);
writel(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 = readl(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);
writel(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.
* @ap: Port 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_port *ap, struct ata_device **r_failed)
{
int i;
i = ata_do_set_mode(ap, r_failed);
if (i < 0)
return i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
if (ata_dev_enabled(dev)) {
pdc2027x_set_piomode(ap, dev);
/*
* Enable prefetch if the device support PIO only.
*/
if (dev->xfer_shift == ATA_SHIFT_PIO) {
u32 ctcr1 = readl(dev_mmio(ap, dev, PDC_CTCR1));
ctcr1 |= (1 << 25);
writel(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 = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
bccrh = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
rmb();
/* Read the counter values again for verification */
bccrlv = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
bccrhv = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
rmb();
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 = readw(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);
writew(pll_ctl, mmio_base + PDC_PLL_CTL);
readw(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 = readw(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 = readl(mmio_base + PDC_SYS_CTL);
PDPRINTK("scr[%X]\n", scr);
writel(scr | (0x01 << 14), mmio_base + PDC_SYS_CTL);
readl(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 = readl(mmio_base + PDC_SYS_CTL);
PDPRINTK("scr[%X]\n", scr);
writel(scr & ~(0x01 << 14), mmio_base + PDC_SYS_CTL);
readl(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);
if (pll_clock < 0) /* counter overflow? Try again. */
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;
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 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];
pdc_ata_setup_port(&host->ports[0]->ioaddr, mmio_base + 0x17c0);
host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x1000;
pdc_ata_setup_port(&host->ports[1]->ioaddr, mmio_base + 0x15c0);
host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x1008;
//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_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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