diff options
Diffstat (limited to 'riscv/ns16550.cc')
| -rw-r--r-- | riscv/ns16550.cc | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/riscv/ns16550.cc b/riscv/ns16550.cc index 8d7e4de..dabe3a9 100644 --- a/riscv/ns16550.cc +++ b/riscv/ns16550.cc @@ -1,7 +1,10 @@ #include <sys/time.h> +#include <sstream> #include "devices.h" #include "processor.h" #include "term.h" +#include "sim.h" +#include "dts.h" #define UART_QUEUE_SIZE 64 @@ -69,9 +72,9 @@ #define UART_SCR 7 /* I/O: Scratch Register */ -ns16550_t::ns16550_t(class bus_t *bus, abstract_interrupt_controller_t *intctrl, +ns16550_t::ns16550_t(abstract_interrupt_controller_t *intctrl, uint32_t interrupt_id, uint32_t reg_shift, uint32_t reg_io_width) - : bus(bus), intctrl(intctrl), interrupt_id(interrupt_id), reg_shift(reg_shift), reg_io_width(reg_io_width), backoff_counter(0) + : intctrl(intctrl), interrupt_id(interrupt_id), reg_shift(reg_shift), reg_io_width(reg_io_width), backoff_counter(0) { ier = 0; iir = UART_IIR_NO_INT; @@ -292,7 +295,7 @@ bool ns16550_t::store(reg_t addr, size_t len, const uint8_t* bytes) return ret; } -void ns16550_t::tick(void) +void ns16550_t::tick(reg_t UNUSED rtc_ticks) { if (!(fcr & UART_FCR_ENABLE_FIFO) || (mcr & UART_MCR_LOOP) || @@ -317,3 +320,38 @@ void ns16550_t::tick(void) lsr |= UART_LSR_DR; update_interrupt(); } + +std::string ns16550_generate_dts(const sim_t* sim) +{ + std::stringstream s; + s << std::hex + << " SERIAL0: ns16550@" << NS16550_BASE << " {\n" + " compatible = \"ns16550a\";\n" + " clock-frequency = <" << std::dec << (sim->CPU_HZ/sim->INSNS_PER_RTC_TICK) << ">;\n" + " interrupt-parent = <&PLIC>;\n" + " interrupts = <" << std::dec << NS16550_INTERRUPT_ID; + reg_t ns16550bs = NS16550_BASE; + reg_t ns16550sz = NS16550_SIZE; + s << std::hex << ">;\n" + " reg = <0x" << (ns16550bs >> 32) << " 0x" << (ns16550bs & (uint32_t)-1) << + " 0x" << (ns16550sz >> 32) << " 0x" << (ns16550sz & (uint32_t)-1) << ">;\n" + " reg-shift = <0x" << NS16550_REG_SHIFT << ">;\n" + " reg-io-width = <0x" << NS16550_REG_IO_WIDTH << ">;\n" + " };\n"; + return s.str(); +} + +ns16550_t* ns16550_parse_from_fdt(const void* fdt, const sim_t* sim, reg_t* base) +{ + uint32_t ns16550_shift, ns16550_io_width, ns16550_int_id; + if (fdt_parse_ns16550(fdt, base, + &ns16550_shift, &ns16550_io_width, &ns16550_int_id, + "ns16550a") == 0) { + abstract_interrupt_controller_t* intctrl = sim->get_intctrl(); + return new ns16550_t(intctrl, ns16550_int_id, ns16550_shift, ns16550_io_width); + } else { + return nullptr; + } +} + +REGISTER_DEVICE(ns16550, ns16550_parse_from_fdt, ns16550_generate_dts) |