81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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/**
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* @brief xHCI Host Controller Driver
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*/
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#include <kernel/printf.h>
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#include <kernel/types.h>
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#include <kernel/pci.h>
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#include <kernel/mmu.h>
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#include <kernel/args.h>
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struct xhci_cap_regs {
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uint32_t cap_caplen_version;
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uint32_t cap_hcsparams1;
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uint32_t cap_hcsparams2;
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uint32_t cap_hcsparams3;
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uint32_t cap_hccparams1;
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uint32_t cap_dboff;
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uint32_t cap_rtsoff;
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uint32_t cap_hccparams2;
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};
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struct xhci_op_regs {
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uint32_t op_usbcmd;
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uint32_t op_usbsts;
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uint32_t op_pagesize;
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uint32_t op__pad1[2];
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uint32_t op_dnctrl;
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uint32_t op_crcr;
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uint32_t op__pad2[5];
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uint32_t op_dcbaap;
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uint32_t op__pad3[1];
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uint32_t op_config;
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};
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static void find_xhci(uint32_t device, uint16_t v, uint16_t d, void * extra) {
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uint16_t device_type = pci_find_type(device);
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if (device_type == 0x0C03) {
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printf("xhci: found a host controller at %02x:%02x.%d\n",
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(int)pci_extract_bus(device),
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(int)pci_extract_slot(device),
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(int)pci_extract_func(device));
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/* The mmio address is 64 bits and combines BAR0 and BAR1... */
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uint64_t addr_low = pci_read_field(device, PCI_BAR0, 4) & 0xFFFFFFF0;
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uint64_t addr_high = pci_read_field(device, PCI_BAR1, 4) & 0xFFFFFFFF; /* I think this is right? */
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uint64_t mmio_addr = (addr_high << 32) | addr_low;
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printf("xhci: mmio space is at %#lx\n", mmio_addr);
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/* Map mmio space... */
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uintptr_t xhci_regs = (uintptr_t)mmu_map_mmio_region(mmio_addr, 0x1000 * 4); /* I don't know. */
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volatile struct xhci_cap_regs * cregs = (volatile struct xhci_cap_regs*)xhci_regs;
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/* Read some registers */
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uint32_t caplength = cregs->cap_caplen_version & 0xFF;
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uint32_t hciversion = (cregs->cap_caplen_version >> 16) & 0xFFFF;
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printf("xhci: CAPLENGTH = %d\n", caplength);
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printf("xhci: HCIVERSION = %d\n", hciversion);
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volatile struct xhci_op_regs * oregs = (volatile struct xhci_op_regs*)(xhci_regs + caplength);
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printf("xhci: USBSTS = %#x\n", oregs->op_usbsts);
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if (oregs->op_usbsts & (1 << 0)) printf("xhci: host controller halt\n");
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if (oregs->op_usbsts & (1 << 2)) printf("xhci: host system error\n");
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if (oregs->op_usbsts & (1 << 3)) printf("xhci: event interrupt\n");
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if (oregs->op_usbsts & (1 << 4)) printf("xhci: port change detect\n");
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if (oregs->op_usbsts & (1 << 8)) printf("xhci: save state status\n");
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if (oregs->op_usbsts & (1 << 9)) printf("xhci: restore state status\n");
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if (oregs->op_usbsts & (1 << 10)) printf("xhci: save restore error\n");
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if (oregs->op_usbsts & (1 << 11)) printf("xhci: controller not ready\n");
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if (oregs->op_usbsts & (1 << 12)) printf("xhci: host controlelr error\n");
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}
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}
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void xhci_initialize(void) {
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pci_scan(find_xhci, -1, NULL);
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}
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