drivers/net/wan/pc300too.c
Source file repositories/reference/linux-study-clean/drivers/net/wan/pc300too.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/net/wan/pc300too.c- Extension
.c- Size
- 13859 bytes
- Lines
- 510
- Domain
- Driver Families
- Bucket
- drivers/net
- Inferred role
- Driver Families: operation-table or driver-model contract
- Status
- pattern implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
- Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Touches IRQ or DMA behavior; this matters for the representative real-device path.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/module.hlinux/kernel.hlinux/slab.hlinux/sched.hlinux/types.hlinux/fcntl.hlinux/in.hlinux/string.hlinux/errno.hlinux/init.hlinux/ioport.hlinux/moduleparam.hlinux/netdevice.hlinux/hdlc.hlinux/pci.hlinux/delay.hasm/io.hhd64572.hhd64572.c
Detected Declarations
function pc300_set_ifacefunction pc300_openfunction pc300_closefunction pc300_siocdevprivatefunction pc300_ioctlfunction pc300_pci_remove_onefunction pc300_pci_init_onefunction pc300_init_modulefunction pc300_cleanup_modulemodule init pc300_init_module
Annotated Snippet
static const struct net_device_ops pc300_ops = {
.ndo_open = pc300_open,
.ndo_stop = pc300_close,
.ndo_start_xmit = hdlc_start_xmit,
.ndo_siocwandev = pc300_ioctl,
.ndo_siocdevprivate = pc300_siocdevprivate,
};
static int pc300_pci_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
card_t *card;
u32 __iomem *p;
int i;
u32 ramsize;
u32 ramphys; /* buffer memory base */
u32 scaphys; /* SCA memory base */
u32 plxphys; /* PLX registers memory base */
i = pci_enable_device(pdev);
if (i)
return i;
i = pci_request_regions(pdev, "PC300");
if (i) {
pci_disable_device(pdev);
return i;
}
card = kzalloc_obj(card_t);
if (!card) {
pci_release_regions(pdev);
pci_disable_device(pdev);
return -ENOBUFS;
}
pci_set_drvdata(pdev, card);
if (pci_resource_len(pdev, 0) != PC300_PLX_SIZE ||
pci_resource_len(pdev, 2) != PC300_SCA_SIZE ||
pci_resource_len(pdev, 3) < 16384) {
pr_err("invalid card EEPROM parameters\n");
pc300_pci_remove_one(pdev);
return -EFAULT;
}
plxphys = pci_resource_start(pdev, 0) & PCI_BASE_ADDRESS_MEM_MASK;
card->plxbase = ioremap(plxphys, PC300_PLX_SIZE);
scaphys = pci_resource_start(pdev, 2) & PCI_BASE_ADDRESS_MEM_MASK;
card->scabase = ioremap(scaphys, PC300_SCA_SIZE);
ramphys = pci_resource_start(pdev, 3) & PCI_BASE_ADDRESS_MEM_MASK;
card->rambase = pci_ioremap_bar(pdev, 3);
if (!card->plxbase || !card->scabase || !card->rambase) {
pr_err("ioremap() failed\n");
pc300_pci_remove_one(pdev);
return -ENOMEM;
}
/* PLX PCI 9050 workaround for local configuration register read bug */
pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, scaphys);
card->init_ctrl_value = readl(&((plx9050 __iomem *)card->scabase)->init_ctrl);
pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, plxphys);
if (pdev->device == PCI_DEVICE_ID_PC300_TE_1 ||
pdev->device == PCI_DEVICE_ID_PC300_TE_2)
card->type = PC300_TE; /* not fully supported */
else if (card->init_ctrl_value & PC300_CTYPE_MASK)
card->type = PC300_X21;
else
card->type = PC300_RSV;
if (pdev->device == PCI_DEVICE_ID_PC300_RX_1 ||
pdev->device == PCI_DEVICE_ID_PC300_TE_1)
card->n_ports = 1;
else
card->n_ports = 2;
for (i = 0; i < card->n_ports; i++) {
card->ports[i].netdev = alloc_hdlcdev(&card->ports[i]);
if (!card->ports[i].netdev) {
pr_err("unable to allocate memory\n");
pc300_pci_remove_one(pdev);
return -ENOMEM;
}
}
/* Reset PLX */
p = &card->plxbase->init_ctrl;
Annotation
- Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/slab.h`, `linux/sched.h`, `linux/types.h`, `linux/fcntl.h`, `linux/in.h`, `linux/string.h`.
- Detected declarations: `function pc300_set_iface`, `function pc300_open`, `function pc300_close`, `function pc300_siocdevprivate`, `function pc300_ioctl`, `function pc300_pci_remove_one`, `function pc300_pci_init_one`, `function pc300_init_module`, `function pc300_cleanup_module`, `module init pc300_init_module`.
- Atlas domain: Driver Families / drivers/net.
- Implementation status: pattern implementation candidate.
- This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
- IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.