XHCI baby steps!

kernel/device/xhci.c

@@ -0,0 +1,107 @@
+#include <device/def_device_op.h>
+#include <device/device.h>
+#include <device/xhci.h>
+#include <libk/list.h>
+#include <libk/std.h>
+#include <libk/string.h>
+#include <mm/malloc.h>
+#include <proc/proc.h>
+#include <proc/reschedule.h>
+#include <proc/suspension_q.h>
+#include <sys/debug.h>
+
+/* clang-format off */
+
+/* capability registers */
+#define XHCI_CAPLENGTH  0x00
+#define XHCI_RSVD       0x01
+#define XHCI_HCIVERSION 0x02
+#define XHCI_HCSPARAMS1 0x04
+#define XHCI_HCSPARAMS2 0x08
+#define XHCI_HCSPARAMS3 0x0C
+#define XHCI_HCCPARAMS1 0x10
+#define XHCI_DBOFF      0x14
+#define XHCI_RTSOFF     0x18
+#define XHCI_HCCPARAMS2 0x1C
+
+/* operational registers */
+#define XHCI_USBCMD     0x00
+#define XHCI_USBSTS     0x04
+#define XHCI_PAGESIZE   0x08
+#define XHCI_DNCTRL     0x14
+#define XHCI_CRCR       0x18
+#define XHCI_DCBAAP     0x30
+#define XHCI_CONFIG     0x38
+
+/* port registers */
+#define XHCI_PORTSC     0x00
+#define XHCI_PORTPMSC   0x04
+#define XHCI_PORTLI     0x08
+
+/* runtime registers */
+#define XHCI_MFINDEX    0x00
+/* + IRQ sets (0x20) */
+#define XHCI_IMAN       0x00
+#define XHCI_IMOD       0x04
+#define XHCI_ERSTSZ     0x08
+#define XHCI_ERSTBA     0x10
+#define XHCI_ERDP       0x18
+
+/* clang-format on */
+
+static void xhci_write8 (uintptr_t base, uint32_t reg, uint8_t value) {
+  *(volatile uint8_t*)(base + reg) = value;
+}
+
+static void xhci_write16 (uintptr_t base, uint32_t reg, uint16_t value) {
+  *(volatile uint16_t*)(base + reg) = value;
+}
+
+static void xhci_write32 (uintptr_t base, uint32_t reg, uint32_t value) {
+  *(volatile uint32_t*)(base + reg) = value;
+}
+
+static uint8_t xhci_read8 (uintptr_t base, uint32_t reg) {
+  return *(volatile uint8_t*)(base + reg);
+}
+
+static uint16_t xhci_read16 (uintptr_t base, uint32_t reg) {
+  return *(volatile uint16_t*)(base + reg);
+}
+
+static uint32_t xhci_read32 (uintptr_t base, uint32_t reg) {
+  return *(volatile uint32_t*)(base + reg);
+}
+
+DEFINE_DEVICE_INIT (xhci_init) {
+  struct xhci* xhci = malloc (sizeof (*xhci));
+
+  if (xhci == NULL)
+    return false;
+
+  struct xhci_init* init = arg;
+
+  memset (xhci, 0, sizeof (*xhci));
+  xhci->device = device;
+  xhci->xhci_mmio_base = init->xhci_mmio_base;
+
+  device->udata = xhci;
+
+  uint8_t cap_length = xhci_read8 (xhci->xhci_mmio_base, XHCI_CAPLENGTH);
+
+  xhci->xhci_oper_base = xhci->xhci_mmio_base + cap_length;
+
+  uint32_t rtsoff = xhci_read32 (xhci->xhci_mmio_base, XHCI_RTSOFF);
+  xhci->xhci_runtime_base = xhci->xhci_mmio_base + rtsoff;
+
+  uint32_t dboff = xhci_read32 (xhci->xhci_mmio_base, XHCI_DBOFF);
+  xhci->xhci_doorbell_base = xhci->xhci_mmio_base + dboff;
+
+  return true;
+}
+
+DEFINE_DEVICE_FINI (xhci_fini) {
+  struct xhci* xhci = device->udata;
+
+  free (xhci);
+}