Commit 571b7e69 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle

MIPS: generic/yamon-dt: Pull YAMON DT shim code out of SEAD-3 board

In preparation for supporting other YAMON-using boards (Malta) & sharing
code to translate information from YAMON into device tree properties,
pull the code doing so for the kernel command line, system memory &
serial configuration out of the SEAD-3 board code.
Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16181/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent efe4a1ac
......@@ -9,9 +9,17 @@ config LEGACY_BOARDS
kernel is booted without being provided with an FDT via the UHI
boot protocol.
config YAMON_DT_SHIM
bool
help
Select this from your board if the board uses the YAMON bootloader
and you wish to include code which helps translate various
YAMON-provided environment variables into a device tree properties.
config LEGACY_BOARD_SEAD3
bool "Support MIPS SEAD-3 boards"
select LEGACY_BOARDS
select YAMON_DT_SHIM
help
Enable this to include support for booting on MIPS SEAD-3 FPGA-based
development boards, which boot using a legacy boot protocol.
......
......@@ -12,5 +12,6 @@ obj-y += init.o
obj-y += irq.o
obj-y += proc.o
obj-$(CONFIG_YAMON_DT_SHIM) += yamon-dt.o
obj-$(CONFIG_LEGACY_BOARD_SEAD3) += board-sead3.o
obj-$(CONFIG_KEXEC) += kexec.o
......@@ -17,6 +17,7 @@
#include <asm/fw/fw.h>
#include <asm/io.h>
#include <asm/machine.h>
#include <asm/yamon-dt.h>
#define SEAD_CONFIG CKSEG1ADDR(0x1b100110)
#define SEAD_CONFIG_GIC_PRESENT BIT(1)
......@@ -33,98 +34,6 @@ static __init bool sead3_detect(void)
return (rev & MIPS_REVISION_MACHINE) == MIPS_REVISION_MACHINE_SEAD3;
}
static __init int append_cmdline(void *fdt)
{
int err, chosen_off;
/* find or add chosen node */
chosen_off = fdt_path_offset(fdt, "/chosen");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_path_offset(fdt, "/chosen@0");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_add_subnode(fdt, 0, "chosen");
if (chosen_off < 0) {
pr_err("Unable to find or add DT chosen node: %d\n",
chosen_off);
return chosen_off;
}
err = fdt_setprop_string(fdt, chosen_off, "bootargs", fw_getcmdline());
if (err) {
pr_err("Unable to set bootargs property: %d\n", err);
return err;
}
return 0;
}
static __init int append_memory(void *fdt)
{
unsigned long phys_memsize, memsize;
__be32 mem_array[2];
int err, mem_off;
char *var;
/* find memory size from the bootloader environment */
var = fw_getenv("memsize");
if (var) {
err = kstrtoul(var, 0, &phys_memsize);
if (err) {
pr_err("Failed to read memsize env variable '%s'\n",
var);
return -EINVAL;
}
} else {
pr_warn("The bootloader didn't provide memsize: defaulting to 32MB\n");
phys_memsize = 32 << 20;
}
/* default to using all available RAM */
memsize = phys_memsize;
/* allow the user to override the usable memory */
var = strstr(arcs_cmdline, "memsize=");
if (var)
memsize = memparse(var + strlen("memsize="), NULL);
/* if the user says there's more RAM than we thought, believe them */
phys_memsize = max_t(unsigned long, phys_memsize, memsize);
/* find or add a memory node */
mem_off = fdt_path_offset(fdt, "/memory");
if (mem_off == -FDT_ERR_NOTFOUND)
mem_off = fdt_add_subnode(fdt, 0, "memory");
if (mem_off < 0) {
pr_err("Unable to find or add memory DT node: %d\n", mem_off);
return mem_off;
}
err = fdt_setprop_string(fdt, mem_off, "device_type", "memory");
if (err) {
pr_err("Unable to set memory node device_type: %d\n", err);
return err;
}
mem_array[0] = 0;
mem_array[1] = cpu_to_be32(phys_memsize);
err = fdt_setprop(fdt, mem_off, "reg", mem_array, sizeof(mem_array));
if (err) {
pr_err("Unable to set memory regs property: %d\n", err);
return err;
}
mem_array[0] = 0;
mem_array[1] = cpu_to_be32(memsize);
err = fdt_setprop(fdt, mem_off, "linux,usable-memory",
mem_array, sizeof(mem_array));
if (err) {
pr_err("Unable to set linux,usable-memory property: %d\n", err);
return err;
}
return 0;
}
static __init int remove_gic(void *fdt)
{
const unsigned int cpu_ehci_int = 2;
......@@ -214,85 +123,6 @@ static __init int remove_gic(void *fdt)
return 0;
}
static __init int serial_config(void *fdt)
{
const char *yamontty, *mode_var;
char mode_var_name[9], path[18], parity;
unsigned int uart, baud, stop_bits;
bool hw_flow;
int chosen_off, err;
yamontty = fw_getenv("yamontty");
if (!yamontty || !strcmp(yamontty, "tty0")) {
uart = 0;
} else if (!strcmp(yamontty, "tty1")) {
uart = 1;
} else {
pr_warn("yamontty environment variable '%s' invalid\n",
yamontty);
uart = 0;
}
baud = stop_bits = 0;
parity = 0;
hw_flow = false;
snprintf(mode_var_name, sizeof(mode_var_name), "modetty%u", uart);
mode_var = fw_getenv(mode_var_name);
if (mode_var) {
while (mode_var[0] >= '0' && mode_var[0] <= '9') {
baud *= 10;
baud += mode_var[0] - '0';
mode_var++;
}
if (mode_var[0] == ',')
mode_var++;
if (mode_var[0])
parity = mode_var[0];
if (mode_var[0] == ',')
mode_var++;
if (mode_var[0])
stop_bits = mode_var[0] - '0';
if (mode_var[0] == ',')
mode_var++;
if (!strcmp(mode_var, "hw"))
hw_flow = true;
}
if (!baud)
baud = 38400;
if (parity != 'e' && parity != 'n' && parity != 'o')
parity = 'n';
if (stop_bits != 7 && stop_bits != 8)
stop_bits = 8;
WARN_ON(snprintf(path, sizeof(path), "uart%u:%u%c%u%s",
uart, baud, parity, stop_bits,
hw_flow ? "r" : "") >= sizeof(path));
/* find or add chosen node */
chosen_off = fdt_path_offset(fdt, "/chosen");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_path_offset(fdt, "/chosen@0");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_add_subnode(fdt, 0, "chosen");
if (chosen_off < 0) {
pr_err("Unable to find or add DT chosen node: %d\n",
chosen_off);
return chosen_off;
}
err = fdt_setprop_string(fdt, chosen_off, "stdout-path", path);
if (err) {
pr_err("Unable to set stdout-path property: %d\n", err);
return err;
}
return 0;
}
static __init const void *sead3_fixup_fdt(const void *fdt,
const void *match_data)
{
......@@ -311,11 +141,11 @@ static __init const void *sead3_fixup_fdt(const void *fdt,
if (err)
panic("Unable to open FDT: %d", err);
err = append_cmdline(fdt_buf);
err = yamon_dt_append_cmdline(fdt_buf);
if (err)
panic("Unable to patch FDT: %d", err);
err = append_memory(fdt_buf);
err = yamon_dt_append_memory(fdt_buf);
if (err)
panic("Unable to patch FDT: %d", err);
......@@ -323,7 +153,7 @@ static __init const void *sead3_fixup_fdt(const void *fdt,
if (err)
panic("Unable to patch FDT: %d", err);
err = serial_config(fdt_buf);
err = yamon_dt_serial_config(fdt_buf);
if (err)
panic("Unable to patch FDT: %d", err);
......
/*
* Copyright (C) 2016 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#define pr_fmt(fmt) "yamon-dt: " fmt
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/libfdt.h>
#include <linux/printk.h>
#include <asm/fw/fw.h>
__init int yamon_dt_append_cmdline(void *fdt)
{
int err, chosen_off;
/* find or add chosen node */
chosen_off = fdt_path_offset(fdt, "/chosen");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_path_offset(fdt, "/chosen@0");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_add_subnode(fdt, 0, "chosen");
if (chosen_off < 0) {
pr_err("Unable to find or add DT chosen node: %d\n",
chosen_off);
return chosen_off;
}
err = fdt_setprop_string(fdt, chosen_off, "bootargs", fw_getcmdline());
if (err) {
pr_err("Unable to set bootargs property: %d\n", err);
return err;
}
return 0;
}
__init int yamon_dt_append_memory(void *fdt)
{
unsigned long phys_memsize, memsize;
__be32 mem_array[2];
int err, mem_off;
char *var;
/* find memory size from the bootloader environment */
var = fw_getenv("memsize");
if (var) {
err = kstrtoul(var, 0, &phys_memsize);
if (err) {
pr_err("Failed to read memsize env variable '%s'\n",
var);
return -EINVAL;
}
} else {
pr_warn("The bootloader didn't provide memsize: defaulting to 32MB\n");
phys_memsize = 32 << 20;
}
/* default to using all available RAM */
memsize = phys_memsize;
/* allow the user to override the usable memory */
var = strstr(arcs_cmdline, "memsize=");
if (var)
memsize = memparse(var + strlen("memsize="), NULL);
/* if the user says there's more RAM than we thought, believe them */
phys_memsize = max_t(unsigned long, phys_memsize, memsize);
/* find or add a memory node */
mem_off = fdt_path_offset(fdt, "/memory");
if (mem_off == -FDT_ERR_NOTFOUND)
mem_off = fdt_add_subnode(fdt, 0, "memory");
if (mem_off < 0) {
pr_err("Unable to find or add memory DT node: %d\n", mem_off);
return mem_off;
}
err = fdt_setprop_string(fdt, mem_off, "device_type", "memory");
if (err) {
pr_err("Unable to set memory node device_type: %d\n", err);
return err;
}
mem_array[0] = 0;
mem_array[1] = cpu_to_be32(phys_memsize);
err = fdt_setprop(fdt, mem_off, "reg", mem_array, sizeof(mem_array));
if (err) {
pr_err("Unable to set memory regs property: %d\n", err);
return err;
}
mem_array[0] = 0;
mem_array[1] = cpu_to_be32(memsize);
err = fdt_setprop(fdt, mem_off, "linux,usable-memory",
mem_array, sizeof(mem_array));
if (err) {
pr_err("Unable to set linux,usable-memory property: %d\n", err);
return err;
}
return 0;
}
__init int yamon_dt_serial_config(void *fdt)
{
const char *yamontty, *mode_var;
char mode_var_name[9], path[18], parity;
unsigned int uart, baud, stop_bits;
bool hw_flow;
int chosen_off, err;
yamontty = fw_getenv("yamontty");
if (!yamontty || !strcmp(yamontty, "tty0")) {
uart = 0;
} else if (!strcmp(yamontty, "tty1")) {
uart = 1;
} else {
pr_warn("yamontty environment variable '%s' invalid\n",
yamontty);
uart = 0;
}
baud = stop_bits = 0;
parity = 0;
hw_flow = false;
snprintf(mode_var_name, sizeof(mode_var_name), "modetty%u", uart);
mode_var = fw_getenv(mode_var_name);
if (mode_var) {
while (mode_var[0] >= '0' && mode_var[0] <= '9') {
baud *= 10;
baud += mode_var[0] - '0';
mode_var++;
}
if (mode_var[0] == ',')
mode_var++;
if (mode_var[0])
parity = mode_var[0];
if (mode_var[0] == ',')
mode_var++;
if (mode_var[0])
stop_bits = mode_var[0] - '0';
if (mode_var[0] == ',')
mode_var++;
if (!strcmp(mode_var, "hw"))
hw_flow = true;
}
if (!baud)
baud = 38400;
if (parity != 'e' && parity != 'n' && parity != 'o')
parity = 'n';
if (stop_bits != 7 && stop_bits != 8)
stop_bits = 8;
WARN_ON(snprintf(path, sizeof(path), "uart%u:%u%c%u%s",
uart, baud, parity, stop_bits,
hw_flow ? "r" : "") >= sizeof(path));
/* find or add chosen node */
chosen_off = fdt_path_offset(fdt, "/chosen");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_path_offset(fdt, "/chosen@0");
if (chosen_off == -FDT_ERR_NOTFOUND)
chosen_off = fdt_add_subnode(fdt, 0, "chosen");
if (chosen_off < 0) {
pr_err("Unable to find or add DT chosen node: %d\n",
chosen_off);
return chosen_off;
}
err = fdt_setprop_string(fdt, chosen_off, "stdout-path", path);
if (err) {
pr_err("Unable to set stdout-path property: %d\n", err);
return err;
}
return 0;
}
/*
* Copyright (C) 2016 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#ifndef __MIPS_ASM_YAMON_DT_H__
#define __MIPS_ASM_YAMON_DT_H__
/**
* yamon_dt_append_cmdline() - Append YAMON-provided command line to /chosen
* @fdt: the FDT blob
*
* Write the YAMON-provided command line to the bootargs property of the
* /chosen node in @fdt.
*
* Return: 0 on success, else -errno
*/
extern __init int yamon_dt_append_cmdline(void *fdt);
/**
* yamon_dt_append_memory() - Append YAMON-provided memory info to /memory
* @fdt: the FDT blob
*
* Generate a /memory node in @fdt based upon memory size information provided
* by YAMON in its environment.
*
* Return: 0 on success, else -errno
*/
extern __init int yamon_dt_append_memory(void *fdt);
/**
* yamon_dt_serial_config() - Append YAMON-provided serial config to /chosen
* @fdt: the FDT blob
*
* Generate a stdout-path property in the /chosen node of @fdt, based upon
* information provided in the YAMON environment about the UART configuration
* of the system.
*
* Return: 0 on success, else -errno
*/
extern __init int yamon_dt_serial_config(void *fdt);
#endif /* __MIPS_ASM_YAMON_DT_H__ */
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