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Date: Wed, 18 Nov 2009 20:59:51 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
linux-ide@...r.kernel.org
Subject: Re: [PATCH 4/5] pata: Update experimental tags
On Wednesday 18 November 2009 20:34:19 Bartlomiej Zolnierkiewicz wrote:
> On Wednesday 18 November 2009 19:41:25 Alan Cox wrote:
>
> > > PCI IDs which make detection across multiple drivers extremely painful) and
> > > confusion (i.e. would you have guessed that HPT302 is supported by pata_hpt37x
> > > while HPT302N by pata_hpt3x2n?).
> >
> > I love highpoint too for their ever weirder and more confusingly labelled
> > and identified chips. I still think the split is worth it, and the 'wtf
> > device am I' logic is needed in both cases - either to pick a driver or
> > pick a set of methods.
>
> While in case of pata_hpt366.c it doesn't look that bad in case of two other
> drivers it does..
>
> pata_hpt366.c:
> ...
> /**
> * hpt36x_init_one - Initialise an HPT366/368
> * @dev: PCI device
> * @id: Entry in match table
> *
> * Initialise an HPT36x device. There are some interesting complications
> * here. Firstly the chip may report 366 and be one of several variants.
> * Secondly all the timings depend on the clock for the chip which we must
> * detect and look up
> *
> * This is the known chip mappings. It may be missing a couple of later
> * releases.
> *
> * Chip version PCI Rev Notes
> * HPT366 4 (HPT366) 0 UDMA66
> * HPT366 4 (HPT366) 1 UDMA66
> * HPT368 4 (HPT366) 2 UDMA66
> * HPT37x/30x 4 (HPT366) 3+ Other driver
> *
> */
>
> static int hpt36x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
> {
> static const struct ata_port_info info_hpt366 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA4,
> .port_ops = &hpt366_port_ops
> };
> const struct ata_port_info *ppi[] = { &info_hpt366, NULL };
>
> void *hpriv = NULL;
> u32 class_rev;
> u32 reg1;
> int rc;
>
> rc = pcim_enable_device(dev);
> if (rc)
> return rc;
>
> pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
> class_rev &= 0xFF;
>
> /* May be a later chip in disguise. Check */
> /* Newer chips are not in the HPT36x driver. Ignore them */
> if (class_rev > 2)
> return -ENODEV;
> ...
>
> pata_hpt37x.c:
> ...
> /**
> * hpt37x_init_one - Initialise an HPT37X/302
> * @dev: PCI device
> * @id: Entry in match table
> *
> * Initialise an HPT37x device. There are some interesting complications
> * here. Firstly the chip may report 366 and be one of several variants.
> * Secondly all the timings depend on the clock for the chip which we must
> * detect and look up
> *
> * This is the known chip mappings. It may be missing a couple of later
> * releases.
> *
> * Chip version PCI Rev Notes
> * HPT366 4 (HPT366) 0 Other driver
> * HPT366 4 (HPT366) 1 Other driver
> * HPT368 4 (HPT366) 2 Other driver
> * HPT370 4 (HPT366) 3 UDMA100
> * HPT370A 4 (HPT366) 4 UDMA100
> * HPT372 4 (HPT366) 5 UDMA133 (1)
> * HPT372N 4 (HPT366) 6 Other driver
> * HPT372A 5 (HPT372) 1 UDMA133 (1)
> * HPT372N 5 (HPT372) 2 Other driver
> * HPT302 6 (HPT302) 1 UDMA133
> * HPT302N 6 (HPT302) 2 Other driver
> * HPT371 7 (HPT371) * UDMA133
> * HPT374 8 (HPT374) * UDMA133 4 channel
> * HPT372N 9 (HPT372N) * Other driver
> *
> * (1) UDMA133 support depends on the bus clock
> */
>
> static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
> {
> /* HPT370 - UDMA100 */
> static const struct ata_port_info info_hpt370 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt370_port_ops
> };
> /* HPT370A - UDMA100 */
> static const struct ata_port_info info_hpt370a = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt370a_port_ops
> };
> /* HPT370 - UDMA100 */
> static const struct ata_port_info info_hpt370_33 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt370_port_ops
> };
> /* HPT370A - UDMA100 */
> static const struct ata_port_info info_hpt370a_33 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt370a_port_ops
> };
> /* HPT371, 372 and friends - UDMA133 */
> static const struct ata_port_info info_hpt372 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA6,
> .port_ops = &hpt372_port_ops
> };
> /* HPT374 - UDMA100, function 1 uses different prereset method */
> static const struct ata_port_info info_hpt374_fn0 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt372_port_ops
> };
> static const struct ata_port_info info_hpt374_fn1 = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA5,
> .port_ops = &hpt374_fn1_port_ops
> };
>
> static const int MHz[4] = { 33, 40, 50, 66 };
> void *private_data = NULL;
> const struct ata_port_info *ppi[] = { NULL, NULL };
>
> u8 irqmask;
> u32 class_rev;
> u8 mcr1;
> u32 freq;
> int prefer_dpll = 1;
>
> unsigned long iobase = pci_resource_start(dev, 4);
>
> const struct hpt_chip *chip_table;
> int clock_slot;
> int rc;
>
> rc = pcim_enable_device(dev);
> if (rc)
> return rc;
>
> pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
> class_rev &= 0xFF;
>
> if (dev->device == PCI_DEVICE_ID_TTI_HPT366) {
> /* May be a later chip in disguise. Check */
> /* Older chips are in the HPT366 driver. Ignore them */
> if (class_rev < 3)
> return -ENODEV;
> /* N series chips have their own driver. Ignore */
> if (class_rev == 6)
> return -ENODEV;
>
> switch(class_rev) {
> case 3:
> ppi[0] = &info_hpt370;
> chip_table = &hpt370;
> prefer_dpll = 0;
> break;
> case 4:
> ppi[0] = &info_hpt370a;
> chip_table = &hpt370a;
> prefer_dpll = 0;
> break;
> case 5:
> ppi[0] = &info_hpt372;
> chip_table = &hpt372;
> break;
> default:
> printk(KERN_ERR "pata_hpt37x: Unknown HPT366 subtype please report (%d).\n", class_rev);
> return -ENODEV;
> }
> } else {
> switch(dev->device) {
> case PCI_DEVICE_ID_TTI_HPT372:
> /* 372N if rev >= 2*/
> if (class_rev >= 2)
> return -ENODEV;
> ppi[0] = &info_hpt372;
> chip_table = &hpt372a;
> break;
> case PCI_DEVICE_ID_TTI_HPT302:
> /* 302N if rev > 1 */
> if (class_rev > 1)
> return -ENODEV;
> ppi[0] = &info_hpt372;
> /* Check this */
> chip_table = &hpt302;
> break;
> case PCI_DEVICE_ID_TTI_HPT371:
> if (class_rev > 1)
> return -ENODEV;
> ppi[0] = &info_hpt372;
> chip_table = &hpt371;
> /* Single channel device, master is not present
> but the BIOS (or us for non x86) must mark it
> absent */
> pci_read_config_byte(dev, 0x50, &mcr1);
> mcr1 &= ~0x04;
> pci_write_config_byte(dev, 0x50, mcr1);
> break;
> case PCI_DEVICE_ID_TTI_HPT374:
> chip_table = &hpt374;
> if (!(PCI_FUNC(dev->devfn) & 1))
> *ppi = &info_hpt374_fn0;
> else
> *ppi = &info_hpt374_fn1;
> break;
> default:
> printk(KERN_ERR "pata_hpt37x: PCI table is bogus please report (%d).\n", dev->device);
> return -ENODEV;
> }
> }
> ...
>
> pata_hpt3x2n.c:
> ...
> /**
> * hpt3x2n_init_one - Initialise an HPT37X/302
> * @dev: PCI device
> * @id: Entry in match table
> *
> * Initialise an HPT3x2n device. There are some interesting complications
> * here. Firstly the chip may report 366 and be one of several variants.
> * Secondly all the timings depend on the clock for the chip which we must
> * detect and look up
> *
> * This is the known chip mappings. It may be missing a couple of later
> * releases.
> *
> * Chip version PCI Rev Notes
> * HPT372 4 (HPT366) 5 Other driver
> * HPT372N 4 (HPT366) 6 UDMA133
> * HPT372 5 (HPT372) 1 Other driver
> * HPT372N 5 (HPT372) 2 UDMA133
> * HPT302 6 (HPT302) * Other driver
> * HPT302N 6 (HPT302) > 1 UDMA133
> * HPT371 7 (HPT371) * Other driver
> * HPT371N 7 (HPT371) > 1 UDMA133
> * HPT374 8 (HPT374) * Other driver
> * HPT372N 9 (HPT372N) * UDMA133
> *
> * (1) UDMA133 support depends on the bus clock
> *
> * To pin down HPT371N
> */
>
> static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
> {
> /* HPT372N and friends - UDMA133 */
> static const struct ata_port_info info = {
> .flags = ATA_FLAG_SLAVE_POSS,
> .pio_mask = ATA_PIO4,
> .mwdma_mask = ATA_MWDMA2,
> .udma_mask = ATA_UDMA6,
> .port_ops = &hpt3x2n_port_ops
> };
> const struct ata_port_info *ppi[] = { &info, NULL };
>
> u8 irqmask;
> u32 class_rev;
>
> unsigned int pci_mhz;
> unsigned int f_low, f_high;
> int adjust;
> unsigned long iobase = pci_resource_start(dev, 4);
> void *hpriv = NULL;
> int rc;
>
> rc = pcim_enable_device(dev);
> if (rc)
> return rc;
>
> pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
> class_rev &= 0xFF;
>
> switch(dev->device) {
> case PCI_DEVICE_ID_TTI_HPT366:
> if (class_rev < 6)
> return -ENODEV;
> break;
> case PCI_DEVICE_ID_TTI_HPT371:
> if (class_rev < 2)
> return -ENODEV;
> /* 371N if rev > 1 */
> break;
> case PCI_DEVICE_ID_TTI_HPT372:
> /* 372N if rev >= 2*/
> if (class_rev < 2)
> return -ENODEV;
> break;
> case PCI_DEVICE_ID_TTI_HPT302:
> if (class_rev < 2)
> return -ENODEV;
> break;
> case PCI_DEVICE_ID_TTI_HPT372N:
> break;
> default:
> printk(KERN_ERR "pata_hpt3x2n: PCI table is bogus please report (%d).\n", dev->device);
> return -ENODEV;
> }
> ...
>
>
> and now for the comparison hpt366.c:
>
>
> ...
> static const struct hpt_info hpt36x __devinitdata = {
> .chip_name = "HPT36x",
> .chip_type = HPT36x,
> .udma_mask = HPT366_ALLOW_ATA66_3 ? (HPT366_ALLOW_ATA66_4 ? ATA_UDMA4 : ATA_UDMA3) : ATA_UDMA2,
> .dpll_clk = 0, /* no DPLL */
> .timings = &hpt36x_timings
> };
>
> static const struct hpt_info hpt370 __devinitdata = {
> .chip_name = "HPT370",
> .chip_type = HPT370,
> .udma_mask = HPT370_ALLOW_ATA100_5 ? ATA_UDMA5 : ATA_UDMA4,
> .dpll_clk = 48,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt370a __devinitdata = {
> .chip_name = "HPT370A",
> .chip_type = HPT370A,
> .udma_mask = HPT370_ALLOW_ATA100_5 ? ATA_UDMA5 : ATA_UDMA4,
> .dpll_clk = 48,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt374 __devinitdata = {
> .chip_name = "HPT374",
> .chip_type = HPT374,
> .udma_mask = ATA_UDMA5,
> .dpll_clk = 48,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt372 __devinitdata = {
> .chip_name = "HPT372",
> .chip_type = HPT372,
> .udma_mask = HPT372_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 55,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt372a __devinitdata = {
> .chip_name = "HPT372A",
> .chip_type = HPT372A,
> .udma_mask = HPT372_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 66,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt302 __devinitdata = {
> .chip_name = "HPT302",
> .chip_type = HPT302,
> .udma_mask = HPT302_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 66,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt371 __devinitdata = {
> .chip_name = "HPT371",
> .chip_type = HPT371,
> .udma_mask = HPT371_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 66,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt372n __devinitdata = {
> .chip_name = "HPT372N",
> .chip_type = HPT372N,
> .udma_mask = HPT372_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 77,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt302n __devinitdata = {
> .chip_name = "HPT302N",
> .chip_type = HPT302N,
> .udma_mask = HPT302_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 77,
> .timings = &hpt37x_timings
> };
>
> static const struct hpt_info hpt371n __devinitdata = {
> .chip_name = "HPT371N",
> .chip_type = HPT371N,
> .udma_mask = HPT371_ALLOW_ATA133_6 ? ATA_UDMA6 : ATA_UDMA5,
> .dpll_clk = 77,
> .timings = &hpt37x_timings
> };
> ...
> /**
> * hpt366_init_one - called when an HPT366 is found
> * @dev: the hpt366 device
> * @id: the matching pci id
> *
> * Called when the PCI registration layer (or the IDE initialization)
> * finds a device matching our IDE device tables.
> */
> static int __devinit hpt366_init_one(struct pci_dev *dev, const struct pci_device_id *id)
> {
> const struct hpt_info *info = NULL;
> struct hpt_info *dyn_info;
> struct pci_dev *dev2 = NULL;
> struct ide_port_info d;
> u8 idx = id->driver_data;
> u8 rev = dev->revision;
> int ret;
>
> if ((idx == 0 || idx == 4) && (PCI_FUNC(dev->devfn) & 1))
> return -ENODEV;
>
> switch (idx) {
> case 0:
> if (rev < 3)
> info = &hpt36x;
> else {
> switch (min_t(u8, rev, 6)) {
> case 3: info = &hpt370; break;
> case 4: info = &hpt370a; break;
> case 5: info = &hpt372; break;
> case 6: info = &hpt372n; break;
> }
> idx++;
> }
> break;
> case 1:
> info = (rev > 1) ? &hpt372n : &hpt372a;
> break;
> case 2:
> info = (rev > 1) ? &hpt302n : &hpt302;
> break;
> case 3:
> hpt371_init(dev);
> info = (rev > 1) ? &hpt371n : &hpt371;
> break;
> case 4:
> info = &hpt374;
> break;
> case 5:
> info = &hpt372n;
> break;
> }
> ...
On the second look it seems pata_ drivers also have something similar
to struct hpt_info (it is called struct hpt_chip) so in reality only
hpt366_init_one() code matters.
--
Bartlomiej Zolnierkiewicz
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