static void uart_pl011_init(struct uart_chip *chip) { if (chip->divider) { mmio_write16(chip->base + UARTCR, 0); while (mmio_read8(chip->base + UARTFR) & UARTFR_BUSY) cpu_relax(); mmio_write16(chip->base + UARTIBRD, chip->divider); mmio_write8(chip->base + UARTLCR_H, UARTLCR_H_WLEN); mmio_write16(chip->base + UARTCR, UARTCR_EN | UARTCR_TXE | UARTCR_Out1 | UARTCR_Out2); } }
/** * Write to PCI config space. * @param bdf 16-bit bus/device/function ID of target. * @param address Config space access address. * @param value Value to be written. * @param size Access size (1, 2 or 4 bytes). * * @see pci_read_config */ void pci_write_config(u16 bdf, u16 address, u32 value, unsigned int size) { void *mmcfg_addr = pci_get_device_mmcfg_base(bdf) + address; if (!pci_space || PCI_BUS(bdf) > end_bus) return arch_pci_write_config(bdf, address, value, size); if (size == 1) mmio_write8(mmcfg_addr, value); else if (size == 2) mmio_write16(mmcfg_addr, value); else mmio_write32(mmcfg_addr, value); }
static int lua_mmio_write16(lua_State *L) { mmio_t *mmio; uint32_t value; uintptr_t offset; int ret; mmio = luaL_checkudata(L, 1, "periphery.MMIO"); lua_mmio_checktype(L, 2, LUA_TNUMBER); lua_mmio_checktype(L, 3, LUA_TNUMBER); offset = lua_tounsigned(L, 2); value = lua_tounsigned(L, 3); if (value > 0xffff) return lua_mmio_error(L, MMIO_ERROR_ARG, 0, "Error: value out of 16-bit range"); if ((ret = mmio_write16(mmio, offset, (uint16_t)value)) < 0) return lua_mmio_error(L, ret, mmio_errno(mmio), "Error: %s", mmio_errmsg(mmio)); return 0; }
void mmio_perform_access(void *base, struct mmio_access *mmio) { void *addr = base + mmio->address; if (mmio->is_write) switch (mmio->size) { case 1: mmio_write8(addr, mmio->value); break; case 2: mmio_write16(addr, mmio->value); break; case 4: mmio_write32(addr, mmio->value); break; #if BITS_PER_LONG == 64 case 8: mmio_write64(addr, mmio->value); break; #endif } else switch (mmio->size) { case 1: mmio->value = mmio_read8(addr); break; case 2: mmio->value = mmio_read16(addr); break; case 4: mmio->value = mmio_read32(addr); break; #if BITS_PER_LONG == 64 case 8: mmio->value = mmio_read64(addr); break; #endif } }