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// SPDX-License-Identifier: GPL-2.0-only
/*
* WHCI UWB Multi-interface Controller enumerator.
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/uwb/whci.h>
#include <linux/uwb/umc.h>
struct whci_card {
struct pci_dev *pci;
void __iomem *uwbbase;
u8 n_caps;
struct umc_dev *devs[0];
};
/* Fix faulty HW :( */
static
u64 whci_capdata_quirks(struct whci_card *card, u64 capdata)
{
u64 capdata_orig = capdata;
struct pci_dev *pci_dev = card->pci;
if (pci_dev->vendor == PCI_VENDOR_ID_INTEL
&& (pci_dev->device == 0x0c3b || pci_dev->device == 0004)
&& pci_dev->class == 0x0d1010) {
switch (UWBCAPDATA_TO_CAP_ID(capdata)) {
/* WLP capability has 0x100 bytes of aperture */
case 0x80:
capdata |= 0x40 << 8; break;
/* WUSB capability has 0x80 bytes of aperture
* and ID is 1 */
case 0x02:
capdata &= ~0xffff;
capdata |= 0x2001;
break;
}
}
if (capdata_orig != capdata)
dev_warn(&pci_dev->dev,
"PCI v%04x d%04x c%06x#%02x: "
"corrected capdata from %016Lx to %016Lx\n",
pci_dev->vendor, pci_dev->device, pci_dev->class,
(unsigned)UWBCAPDATA_TO_CAP_ID(capdata),
(unsigned long long)capdata_orig,
(unsigned long long)capdata);
return capdata;
}
/**
* whci_wait_for - wait for a WHCI register to be set
*
* Polls (for at most @max_ms ms) until '*@reg & @mask == @result'.
*/
int whci_wait_for(struct device *dev, u32 __iomem *reg, u32 mask, u32 result,
unsigned long max_ms, const char *tag)
{
unsigned t = 0;
u32 val;
for (;;) {
val = le_readl(reg);
if ((val & mask) == result)
break;
if (t >= max_ms) {
dev_err(dev, "%s timed out\n", tag);
return -ETIMEDOUT;
}
msleep(10);
t += 10;
}
return 0;
}
EXPORT_SYMBOL_GPL(whci_wait_for);
/*
* NOTE: the capinfo and capdata registers are slightly different
* (size and cap-id fields). So for cap #0, we need to fill
* in. Size comes from the size of the register block
* (statically calculated); cap_id comes from nowhere, we use
* zero, that is reserved, for the radio controller, because
* none was defined at the spec level.
*/
static int whci_add_cap(struct whci_card *card, int n)
{
struct umc_dev *umc;
u64 capdata;
int bar, err;
umc = umc_device_create(&card->pci->dev, n);
if (umc == NULL)
return -ENOMEM;
capdata = le_readq(card->uwbbase + UWBCAPDATA(n));
bar = UWBCAPDATA_TO_BAR(capdata) << 1;
capdata = whci_capdata_quirks(card, capdata);
/* Capability 0 is the radio controller. It's size is 32
* bytes (WHCI0.95[2.3, T2-9]). */
umc->version = UWBCAPDATA_TO_VERSION(capdata);
umc->cap_id = n == 0 ? 0 : UWBCAPDATA_TO_CAP_ID(capdata);
umc->bar = bar;
umc->resource.start = pci_resource_start(card->pci, bar)
+ UWBCAPDATA_TO_OFFSET(capdata);
umc->resource.end = umc->resource.start
+ (n == 0 ? 0x20 : UWBCAPDATA_TO_SIZE(capdata)) - 1;
umc->resource.name = dev_name(&umc->dev);
umc->resource.flags = card->pci->resource[bar].flags;
umc->resource.parent = &card->pci->resource[bar];
umc->irq = card->pci->irq;
err = umc_device_register(umc);
if (err < 0)
goto error;
card->devs[n] = umc;
return 0;
error:
kfree(umc);
return err;
}
static void whci_del_cap(struct whci_card *card, int n)
{
struct umc_dev *umc = card->devs[n];
umc_device_unregister(umc);
}
static int whci_n_caps(struct pci_dev *pci)
{
void __iomem *uwbbase;
u64 capinfo;
uwbbase = pci_iomap(pci, 0, 8);
if (!uwbbase)
return -ENOMEM;
capinfo = le_readq(uwbbase + UWBCAPINFO);
pci_iounmap(pci, uwbbase);
return UWBCAPINFO_TO_N_CAPS(capinfo);
}
static int whci_probe(struct pci_dev *pci, const struct pci_device_id *id)
{
struct whci_card *card;
int err, n_caps, n;
err = pci_enable_device(pci);
if (err < 0)
goto error;
pci_enable_msi(pci);
pci_set_master(pci);
err = -ENXIO;
if (!pci_set_dma_mask(pci, DMA_BIT_MASK(64)))
pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64));
else if (!pci_set_dma_mask(pci, DMA_BIT_MASK(32)))
pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32));
else
goto error_dma;
err = n_caps = whci_n_caps(pci);
if (n_caps < 0)
goto error_ncaps;
err = -ENOMEM;
card = kzalloc(sizeof(struct whci_card)
+ sizeof(struct umc_dev *) * (n_caps + 1),
GFP_KERNEL);
if (card == NULL)
goto error_kzalloc;
card->pci = pci;
card->n_caps = n_caps;
err = -EBUSY;
if (!request_mem_region(pci_resource_start(pci, 0),
UWBCAPDATA_SIZE(card->n_caps),
"whci (capability data)"))
goto error_request_memregion;
err = -ENOMEM;
card->uwbbase = pci_iomap(pci, 0, UWBCAPDATA_SIZE(card->n_caps));
if (!card->uwbbase)
goto error_iomap;
/* Add each capability. */
for (n = 0; n <= card->n_caps; n++) {
err = whci_add_cap(card, n);
if (err < 0 && n == 0) {
dev_err(&pci->dev, "cannot bind UWB radio controller:"
" %d\n", err);
goto error_bind;
}
if (err < 0)
dev_warn(&pci->dev, "warning: cannot bind capability "
"#%u: %d\n", n, err);
}
pci_set_drvdata(pci, card);
return 0;
error_bind:
pci_iounmap(pci, card->uwbbase);
error_iomap:
release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
error_request_memregion:
kfree(card);
error_kzalloc:
error_ncaps:
error_dma:
pci_disable_msi(pci);
pci_disable_device(pci);
error:
return err;
}
static void whci_remove(struct pci_dev *pci)
{
struct whci_card *card = pci_get_drvdata(pci);
int n;
pci_set_drvdata(pci, NULL);
/* Unregister each capability in reverse (so the master device
* is unregistered last). */
for (n = card->n_caps; n >= 0 ; n--)
whci_del_cap(card, n);
pci_iounmap(pci, card->uwbbase);
release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
kfree(card);
pci_disable_msi(pci);
pci_disable_device(pci);
}
static struct pci_device_id whci_id_table[] = {
{ PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
{ 0 },
};
MODULE_DEVICE_TABLE(pci, whci_id_table);
static struct pci_driver whci_driver = {
.name = "whci",
.id_table = whci_id_table,
.probe = whci_probe,
.remove = whci_remove,
};
module_pci_driver(whci_driver);
MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator");
MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
MODULE_LICENSE("GPL");
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