^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2014 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Author: Rob Herring <robh@kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Based on 8250 earlycon:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Bjorn Helgaas <bjorn.helgaas@hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/serial_core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/of_fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #ifdef CONFIG_FIX_EARLYCON_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/serial.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static struct console early_con = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .name = "uart", /* fixed up at earlycon registration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .flags = CON_PRINTBUFFER | CON_BOOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .index = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static struct earlycon_device early_console_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .con = &early_con,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #ifdef CONFIG_FIX_EARLYCON_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) set_fixmap_io(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) base += paddr & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) base = ioremap(paddr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static void __init earlycon_init(struct earlycon_device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct console *earlycon = device->con;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) const char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* scan backwards from end of string for first non-numeral */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) for (s = name + strlen(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) s > name && s[-1] >= '0' && s[-1] <= '9';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) s--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (*s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) earlycon->index = simple_strtoul(s, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) len = s - name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) strlcpy(earlycon->name, name, min(len + 1, sizeof(earlycon->name)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) earlycon->data = &early_console_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static void __init earlycon_print_info(struct earlycon_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct console *earlycon = device->con;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct uart_port *port = &device->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM16 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) port->iotype == UPIO_MEM32 || port->iotype == UPIO_MEM32BE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) pr_info("%s%d at MMIO%s %pa (options '%s')\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) earlycon->name, earlycon->index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) (port->iotype == UPIO_MEM) ? "" :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) (port->iotype == UPIO_MEM16) ? "16" :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) (port->iotype == UPIO_MEM32) ? "32" : "32be",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) &port->mapbase, device->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) pr_info("%s%d at I/O port 0x%lx (options '%s')\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) earlycon->name, earlycon->index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) port->iobase, device->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static int __init parse_options(struct earlycon_device *device, char *options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct uart_port *port = &device->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) resource_size_t addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) switch (port->iotype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) case UPIO_MEM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) port->mapbase = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) case UPIO_MEM16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) port->regshift = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) port->mapbase = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) case UPIO_MEM32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) case UPIO_MEM32BE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) port->regshift = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) port->mapbase = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) case UPIO_PORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) port->iobase = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (options) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) device->baud = simple_strtoul(options, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) length = min(strcspn(options, " ") + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) (size_t)(sizeof(device->options)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) strlcpy(device->options, options, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int __init register_earlycon(char *buf, const struct earlycon_id *match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct uart_port *port = &early_console_dev.port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* On parsing error, pass the options buf to the setup function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (buf && !parse_options(&early_console_dev, buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) spin_lock_init(&port->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) port->uartclk = BASE_BAUD * 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (port->mapbase)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) port->membase = earlycon_map(port->mapbase, 64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) earlycon_init(&early_console_dev, match->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) err = match->setup(&early_console_dev, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) earlycon_print_info(&early_console_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!early_console_dev.con->write)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) register_console(early_console_dev.con);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * setup_earlycon - match and register earlycon console
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * @buf: earlycon param string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * Registers the earlycon console matching the earlycon specified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * in the param string @buf. Acceptable param strings are of the form
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * <name>,io|mmio|mmio32|mmio32be,<addr>,<options>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * <name>,0x<addr>,<options>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * <name>,<options>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * <name>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * Only for the third form does the earlycon setup() method receive the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * <options> string in the 'options' parameter; all other forms set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * the parameter to NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * Returns 0 if an attempt to register the earlycon was made,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * otherwise negative error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int __init setup_earlycon(char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) const struct earlycon_id **p_match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) bool empty_compatible = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (!buf || !buf[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (early_con.flags & CON_ENABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return -EALREADY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) for (p_match = __earlycon_table; p_match < __earlycon_table_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) p_match++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) const struct earlycon_id *match = *p_match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) size_t len = strlen(match->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (strncmp(buf, match->name, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /* prefer entries with empty compatible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (empty_compatible && *match->compatible)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (buf[len]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (buf[len] != ',')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) buf += len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return register_earlycon(buf, match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (empty_compatible) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) empty_compatible = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * This defers the initialization of the early console until after ACPI has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * been initialized.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) bool earlycon_acpi_spcr_enable __initdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /* early_param wrapper for setup_earlycon() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static int __init param_setup_earlycon(char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /* Just 'earlycon' is a valid param for devicetree and ACPI SPCR. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (!buf || !buf[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) earlycon_acpi_spcr_enable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) } else if (!buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return early_init_dt_scan_chosen_stdout();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) err = setup_earlycon(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (err == -ENOENT || err == -EALREADY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) early_param("earlycon", param_setup_earlycon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) #ifdef CONFIG_OF_EARLY_FLATTREE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) int __init of_setup_earlycon(const struct earlycon_id *match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) unsigned long node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) const char *options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct uart_port *port = &early_console_dev.port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) const __be32 *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) bool big_endian;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) u64 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) spin_lock_init(&port->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) port->iotype = UPIO_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) addr = of_flat_dt_translate_address(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (addr == OF_BAD_ADDR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) pr_warn("[%s] bad address\n", match->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) port->mapbase = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) val = of_get_flat_dt_prop(node, "reg-offset", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) port->mapbase += be32_to_cpu(*val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) port->membase = earlycon_map(port->mapbase, SZ_4K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) val = of_get_flat_dt_prop(node, "reg-shift", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) port->regshift = be32_to_cpu(*val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) big_endian = of_get_flat_dt_prop(node, "big-endian", NULL) != NULL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) of_get_flat_dt_prop(node, "native-endian", NULL) != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) val = of_get_flat_dt_prop(node, "reg-io-width", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) switch (be32_to_cpu(*val)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) port->iotype = UPIO_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) port->iotype = UPIO_MEM16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) port->iotype = (big_endian) ? UPIO_MEM32BE : UPIO_MEM32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) pr_warn("[%s] unsupported reg-io-width\n", match->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) val = of_get_flat_dt_prop(node, "current-speed", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) early_console_dev.baud = be32_to_cpu(*val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) val = of_get_flat_dt_prop(node, "clock-frequency", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) port->uartclk = be32_to_cpu(*val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (options) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) early_console_dev.baud = simple_strtoul(options, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) strlcpy(early_console_dev.options, options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) sizeof(early_console_dev.options));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) earlycon_init(&early_console_dev, match->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) err = match->setup(&early_console_dev, options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) earlycon_print_info(&early_console_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (!early_console_dev.con->write)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) register_console(early_console_dev.con);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) #endif /* CONFIG_OF_EARLY_FLATTREE */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags