diff options
Diffstat (limited to 'riscv/dts.cc')
| -rw-r--r-- | riscv/dts.cc | 93 |
1 files changed, 90 insertions, 3 deletions
diff --git a/riscv/dts.cc b/riscv/dts.cc index 9937d57..6a40565 100644 --- a/riscv/dts.cc +++ b/riscv/dts.cc @@ -27,15 +27,16 @@ std::string make_dts(size_t insns_per_rtc_tick, size_t cpu_hz, " #size-cells = <2>;\n" " compatible = \"ucbbar,spike-bare-dev\";\n" " model = \"ucbbar,spike-bare\";\n" - " chosen {\n"; + " chosen {\n" + " stdout-path = &SERIAL0;\n"; if (initrd_start < initrd_end) { s << " linux,initrd-start = <" << (size_t)initrd_start << ">;\n" " linux,initrd-end = <" << (size_t)initrd_end << ">;\n"; if (!bootargs) - bootargs = "root=/dev/ram console=hvc0 earlycon=sbi"; + bootargs = "root=/dev/ram console=ttyS0 earlycon"; } else { if (!bootargs) - bootargs = "console=hvc0 earlycon=sbi"; + bootargs = "console=ttyS0 earlycon"; } s << " bootargs = \""; for (size_t i = 0; i < strlen(bootargs); i++) { @@ -94,6 +95,34 @@ std::string make_dts(size_t insns_per_rtc_tick, size_t cpu_hz, " reg = <0x" << (clintbs >> 32) << " 0x" << (clintbs & (uint32_t)-1) << " 0x" << (clintsz >> 32) << " 0x" << (clintsz & (uint32_t)-1) << ">;\n" " };\n" + " PLIC: plic@" << PLIC_BASE << " {\n" + " compatible = \"riscv,plic0\";\n" + " interrupts-extended = <" << std::dec; + for (size_t i = 0; i < procs.size(); i++) + s << "&CPU" << i << "_intc 11 &CPU" << i << "_intc 9 "; + reg_t plicbs = PLIC_BASE; + reg_t plicsz = PLIC_SIZE; + s << std::hex << ">;\n" + " reg = <0x" << (plicbs >> 32) << " 0x" << (plicbs & (uint32_t)-1) << + " 0x" << (plicsz >> 32) << " 0x" << (plicsz & (uint32_t)-1) << ">;\n" + " riscv,ndev = <0x" << PLIC_NDEV << ">;\n" + " riscv,max-priority = <0x" << ((1U << PLIC_PRIO_BITS) - 1) << ">;\n" + " #interrupt-cells = <1>;\n" + " interrupt-controller;\n" + " };\n" + " SERIAL0: ns16550@" << NS16550_BASE << " {\n" + " compatible = \"ns16550a\";\n" + " clock-frequency = <" << std::dec << (cpu_hz/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" " };\n" " htif {\n" " compatible = \"ucb,htif0\";\n" @@ -276,6 +305,64 @@ int fdt_parse_clint(void *fdt, reg_t *clint_addr, return 0; } +int fdt_parse_plic(void *fdt, reg_t *plic_addr, uint32_t *ndev, + const char *compatible) +{ + int nodeoffset, len, rc; + const fdt32_t *ndev_p; + + nodeoffset = fdt_node_offset_by_compatible(fdt, -1, compatible); + if (nodeoffset < 0) + return nodeoffset; + + rc = fdt_get_node_addr_size(fdt, nodeoffset, plic_addr, NULL, "reg"); + if (rc < 0 || !plic_addr) + return -ENODEV; + + ndev_p = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "riscv,ndev", &len); + if (!ndev || !ndev_p) + return -ENODEV; + *ndev = fdt32_to_cpu(*ndev_p); + + return 0; +} + +int fdt_parse_ns16550(void *fdt, reg_t *ns16550_addr, + uint32_t *reg_shift, uint32_t *reg_io_width, + const char *compatible) +{ + int nodeoffset, len, rc; + const fdt32_t *reg_p; + + nodeoffset = fdt_node_offset_by_compatible(fdt, -1, compatible); + if (nodeoffset < 0) + return nodeoffset; + + rc = fdt_get_node_addr_size(fdt, nodeoffset, ns16550_addr, NULL, "reg"); + if (rc < 0 || !ns16550_addr) + return -ENODEV; + + reg_p = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-shift", &len); + if (reg_shift) { + if (reg_p) { + *reg_shift = fdt32_to_cpu(*reg_p); + } else { + *reg_shift = NS16550_REG_SHIFT; + } + } + + reg_p = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "reg-io-width", &len); + if (reg_io_width) { + if (reg_p) { + *reg_io_width = fdt32_to_cpu(*reg_p); + } else { + *reg_io_width = NS16550_REG_IO_WIDTH; + } + } + + return 0; +} + int fdt_parse_pmp_num(void *fdt, int cpu_offset, reg_t *pmp_num) { int rc; |