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linux/arch/sparc64/kernel/setup.c
Eddie C. Dost c126cf80d4 [SPARC64]: Serial Console for E250 Patch 
From: Eddie C. Dost <ecd@brainaid.de>

I have the following patch for serial console over the RSC
(remote system controller) on my E250 machine. It basically adds
support for input-device=rsc and output-device=rsc from OBP, and
allows 115200,8,n,1,- serial mode setting.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-18 14:54:31 -08:00

709 lines
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/* $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
* linux/arch/sparc64/kernel/setup.c
*
* Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/inet.h>
#include <linux/console.h>
#include <linux/root_dev.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/idprom.h>
#include <asm/head.h>
#include <asm/starfire.h>
#include <asm/mmu_context.h>
#include <asm/timer.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/mmu.h>
#ifdef CONFIG_IP_PNP
#include <net/ipconfig.h>
#endif
struct screen_info screen_info = {
0, 0, /* orig-x, orig-y */
0, /* unused */
0, /* orig-video-page */
0, /* orig-video-mode */
128, /* orig-video-cols */
0, 0, 0, /* unused, ega_bx, unused */
54, /* orig-video-lines */
0, /* orig-video-isVGA */
16 /* orig-video-points */
};
/* Typing sync at the prom prompt calls the function pointed to by
* the sync callback which I set to the following function.
* This should sync all filesystems and return, for now it just
* prints out pretty messages and returns.
*/
void (*prom_palette)(int);
void (*prom_keyboard)(void);
static void
prom_console_write(struct console *con, const char *s, unsigned n)
{
prom_write(s, n);
}
static struct console prom_console = {
.name = "prom",
.write = prom_console_write,
.flags = CON_CONSDEV | CON_ENABLED,
.index = -1,
};
#define PROM_TRUE -1
#define PROM_FALSE 0
/* Pretty sick eh? */
int prom_callback(long *args)
{
struct console *cons, *saved_console = NULL;
unsigned long flags;
char *cmd;
extern spinlock_t prom_entry_lock;
if (!args)
return -1;
if (!(cmd = (char *)args[0]))
return -1;
/*
* The callback can be invoked on the cpu that first dropped
* into prom_cmdline after taking the serial interrupt, or on
* a slave processor that was smp_captured() if the
* administrator has done a switch-cpu inside obp. In either
* case, the cpu is marked as in-interrupt. Drop IRQ locks.
*/
irq_exit();
/* XXX Revisit the locking here someday. This is a debugging
* XXX feature so it isnt all that critical. -DaveM
*/
local_irq_save(flags);
spin_unlock(&prom_entry_lock);
cons = console_drivers;
while (cons) {
unregister_console(cons);
cons->flags &= ~(CON_PRINTBUFFER);
cons->next = saved_console;
saved_console = cons;
cons = console_drivers;
}
register_console(&prom_console);
if (!strcmp(cmd, "sync")) {
prom_printf("PROM `%s' command...\n", cmd);
show_free_areas();
if (current->pid != 0) {
local_irq_enable();
sys_sync();
local_irq_disable();
}
args[2] = 0;
args[args[1] + 3] = -1;
prom_printf("Returning to PROM\n");
} else if (!strcmp(cmd, "va>tte-data")) {
unsigned long ctx, va;
unsigned long tte = 0;
long res = PROM_FALSE;
ctx = args[3];
va = args[4];
if (ctx) {
/*
* Find process owning ctx, lookup mapping.
*/
struct task_struct *p;
struct mm_struct *mm = NULL;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
pte_t pte;
for_each_process(p) {
mm = p->mm;
if (CTX_NRBITS(mm->context) == ctx)
break;
}
if (!mm ||
CTX_NRBITS(mm->context) != ctx)
goto done;
pgdp = pgd_offset(mm, va);
if (pgd_none(*pgdp))
goto done;
pudp = pud_offset(pgdp, va);
if (pud_none(*pudp))
goto done;
pmdp = pmd_offset(pudp, va);
if (pmd_none(*pmdp))
goto done;
/* Preemption implicitly disabled by virtue of
* being called from inside OBP.
*/
ptep = pte_offset_map(pmdp, va);
pte = *ptep;
if (pte_present(pte)) {
tte = pte_val(pte);
res = PROM_TRUE;
}
pte_unmap(ptep);
goto done;
}
if ((va >= KERNBASE) && (va < (KERNBASE + (4 * 1024 * 1024)))) {
extern unsigned long sparc64_kern_pri_context;
/* Spitfire Errata #32 workaround */
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (sparc64_kern_pri_context),
"r" (PRIMARY_CONTEXT),
"i" (ASI_DMMU));
/*
* Locked down tlb entry.
*/
if (tlb_type == spitfire)
tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
else if (tlb_type == cheetah || tlb_type == cheetah_plus)
tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
res = PROM_TRUE;
goto done;
}
if (va < PGDIR_SIZE) {
/*
* vmalloc or prom_inherited mapping.
*/
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
pte_t pte;
int error;
if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
tte = prom_virt_to_phys(va, &error);
if (!error)
res = PROM_TRUE;
goto done;
}
pgdp = pgd_offset_k(va);
if (pgd_none(*pgdp))
goto done;
pudp = pud_offset(pgdp, va);
if (pud_none(*pudp))
goto done;
pmdp = pmd_offset(pudp, va);
if (pmd_none(*pmdp))
goto done;
/* Preemption implicitly disabled by virtue of
* being called from inside OBP.
*/
ptep = pte_offset_kernel(pmdp, va);
pte = *ptep;
if (pte_present(pte)) {
tte = pte_val(pte);
res = PROM_TRUE;
}
goto done;
}
if (va < PAGE_OFFSET) {
/*
* No mappings here.
*/
goto done;
}
if (va & (1UL << 40)) {
/*
* I/O page.
*/
tte = (__pa(va) & _PAGE_PADDR) |
_PAGE_VALID | _PAGE_SZ4MB |
_PAGE_E | _PAGE_P | _PAGE_W;
res = PROM_TRUE;
goto done;
}
/*
* Normal page.
*/
tte = (__pa(va) & _PAGE_PADDR) |
_PAGE_VALID | _PAGE_SZ4MB |
_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
res = PROM_TRUE;
done:
if (res == PROM_TRUE) {
args[2] = 3;
args[args[1] + 3] = 0;
args[args[1] + 4] = res;
args[args[1] + 5] = tte;
} else {
args[2] = 2;
args[args[1] + 3] = 0;
args[args[1] + 4] = res;
}
} else if (!strcmp(cmd, ".soft1")) {
unsigned long tte;
tte = args[3];
prom_printf("%lx:\"%s%s%s%s%s\" ",
(tte & _PAGE_SOFT) >> 7,
tte & _PAGE_MODIFIED ? "M" : "-",
tte & _PAGE_ACCESSED ? "A" : "-",
tte & _PAGE_READ ? "W" : "-",
tte & _PAGE_WRITE ? "R" : "-",
tte & _PAGE_PRESENT ? "P" : "-");
args[2] = 2;
args[args[1] + 3] = 0;
args[args[1] + 4] = PROM_TRUE;
} else if (!strcmp(cmd, ".soft2")) {
unsigned long tte;
tte = args[3];
prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
args[2] = 2;
args[args[1] + 3] = 0;
args[args[1] + 4] = PROM_TRUE;
} else {
prom_printf("unknown PROM `%s' command...\n", cmd);
}
unregister_console(&prom_console);
while (saved_console) {
cons = saved_console;
saved_console = cons->next;
register_console(cons);
}
spin_lock(&prom_entry_lock);
local_irq_restore(flags);
/*
* Restore in-interrupt status for a resume from obp.
*/
irq_enter();
return 0;
}
unsigned int boot_flags = 0;
#define BOOTME_DEBUG 0x1
#define BOOTME_SINGLE 0x2
/* Exported for mm/init.c:paging_init. */
unsigned long cmdline_memory_size = 0;
static struct console prom_debug_console = {
.name = "debug",
.write = prom_console_write,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/* XXX Implement this at some point... */
void kernel_enter_debugger(void)
{
}
int obp_system_intr(void)
{
if (boot_flags & BOOTME_DEBUG) {
printk("OBP: system interrupted\n");
prom_halt();
return 1;
}
return 0;
}
/*
* Process kernel command line switches that are specific to the
* SPARC or that require special low-level processing.
*/
static void __init process_switch(char c)
{
switch (c) {
case 'd':
boot_flags |= BOOTME_DEBUG;
break;
case 's':
boot_flags |= BOOTME_SINGLE;
break;
case 'h':
prom_printf("boot_flags_init: Halt!\n");
prom_halt();
break;
case 'p':
/* Use PROM debug console. */
register_console(&prom_debug_console);
break;
case 'P':
/* Force UltraSPARC-III P-Cache on. */
if (tlb_type != cheetah) {
printk("BOOT: Ignoring P-Cache force option.\n");
break;
}
cheetah_pcache_forced_on = 1;
add_taint(TAINT_MACHINE_CHECK);
cheetah_enable_pcache();
break;
default:
printk("Unknown boot switch (-%c)\n", c);
break;
}
}
static void __init process_console(char *commands)
{
serial_console = 0;
commands += 8;
/* Linux-style serial */
if (!strncmp(commands, "ttyS", 4))
serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
else if (!strncmp(commands, "tty", 3)) {
char c = *(commands + 3);
/* Solaris-style serial */
if (c == 'a' || c == 'b') {
serial_console = c - 'a' + 1;
prom_printf ("Using /dev/tty%c as console.\n", c);
}
/* else Linux-style fbcon, not serial */
}
#if defined(CONFIG_PROM_CONSOLE)
if (!strncmp(commands, "prom", 4)) {
char *p;
for (p = commands - 8; *p && *p != ' '; p++)
*p = ' ';
conswitchp = &prom_con;
}
#endif
}
static void __init boot_flags_init(char *commands)
{
while (*commands) {
/* Move to the start of the next "argument". */
while (*commands && *commands == ' ')
commands++;
/* Process any command switches, otherwise skip it. */
if (*commands == '\0')
break;
if (*commands == '-') {
commands++;
while (*commands && *commands != ' ')
process_switch(*commands++);
continue;
}
if (!strncmp(commands, "console=", 8)) {
process_console(commands);
} else if (!strncmp(commands, "mem=", 4)) {
/*
* "mem=XXX[kKmM]" overrides the PROM-reported
* memory size.
*/
cmdline_memory_size = simple_strtoul(commands + 4,
&commands, 0);
if (*commands == 'K' || *commands == 'k') {
cmdline_memory_size <<= 10;
commands++;
} else if (*commands=='M' || *commands=='m') {
cmdline_memory_size <<= 20;
commands++;
}
}
while (*commands && *commands != ' ')
commands++;
}
}
extern void panic_setup(char *, int *);
extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
extern int root_mountflags;
char reboot_command[COMMAND_LINE_SIZE];
static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
void register_prom_callbacks(void)
{
prom_setcallback(prom_callback);
prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
"' linux-va>tte-data to va>tte-data");
prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
"' linux-.soft1 to .soft1");
prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
"' linux-.soft2 to .soft2");
}
void __init setup_arch(char **cmdline_p)
{
/* Initialize PROM console and command line. */
*cmdline_p = prom_getbootargs();
strcpy(saved_command_line, *cmdline_p);
printk("ARCH: SUN4U\n");
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#elif defined(CONFIG_PROM_CONSOLE)
conswitchp = &prom_con;
#endif
/* Work out if we are starfire early on */
check_if_starfire();
boot_flags_init(*cmdline_p);
idprom_init();
if (!root_flags)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_INITRD
rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
#endif
task_thread_info(&init_task)->kregs = &fake_swapper_regs;
#ifdef CONFIG_IP_PNP
if (!ic_set_manually) {
int chosen = prom_finddevice ("/chosen");
u32 cl, sv, gw;
cl = prom_getintdefault (chosen, "client-ip", 0);
sv = prom_getintdefault (chosen, "server-ip", 0);
gw = prom_getintdefault (chosen, "gateway-ip", 0);
if (cl && sv) {
ic_myaddr = cl;
ic_servaddr = sv;
if (gw)
ic_gateway = gw;
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
ic_proto_enabled = 0;
#endif
}
}
#endif
paging_init();
}
static int __init set_preferred_console(void)
{
int idev, odev;
/* The user has requested a console so this is already set up. */
if (serial_console >= 0)
return -EBUSY;
idev = prom_query_input_device();
odev = prom_query_output_device();
if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
serial_console = 0;
} else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
serial_console = 1;
} else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
serial_console = 2;
} else if (idev == PROMDEV_IRSC && odev == PROMDEV_ORSC) {
serial_console = 3;
} else {
prom_printf("Inconsistent console: "
"input %d, output %d\n",
idev, odev);
prom_halt();
}
if (serial_console)
return add_preferred_console("ttyS", serial_console - 1, NULL);
return -ENODEV;
}
console_initcall(set_preferred_console);
/* BUFFER is PAGE_SIZE bytes long. */
extern char *sparc_cpu_type;
extern char *sparc_fpu_type;
extern void smp_info(struct seq_file *);
extern void smp_bogo(struct seq_file *);
extern void mmu_info(struct seq_file *);
unsigned int dcache_parity_tl1_occurred;
unsigned int icache_parity_tl1_occurred;
static int ncpus_probed;
static int show_cpuinfo(struct seq_file *m, void *__unused)
{
seq_printf(m,
"cpu\t\t: %s\n"
"fpu\t\t: %s\n"
"promlib\t\t: Version 3 Revision %d\n"
"prom\t\t: %d.%d.%d\n"
"type\t\t: sun4u\n"
"ncpus probed\t: %d\n"
"ncpus active\t: %d\n"
"D$ parity tl1\t: %u\n"
"I$ parity tl1\t: %u\n"
#ifndef CONFIG_SMP
"Cpu0Bogo\t: %lu.%02lu\n"
"Cpu0ClkTck\t: %016lx\n"
#endif
,
sparc_cpu_type,
sparc_fpu_type,
prom_rev,
prom_prev >> 16,
(prom_prev >> 8) & 0xff,
prom_prev & 0xff,
ncpus_probed,
num_online_cpus(),
dcache_parity_tl1_occurred,
icache_parity_tl1_occurred
#ifndef CONFIG_SMP
, cpu_data(0).udelay_val/(500000/HZ),
(cpu_data(0).udelay_val/(5000/HZ)) % 100,
cpu_data(0).clock_tick
#endif
);
#ifdef CONFIG_SMP
smp_bogo(m);
#endif
mmu_info(m);
#ifdef CONFIG_SMP
smp_info(m);
#endif
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
/* The pointer we are returning is arbitrary,
* it just has to be non-NULL and not IS_ERR
* in the success case.
*/
return *pos == 0 ? &c_start : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
.start =c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};
extern int stop_a_enabled;
void sun_do_break(void)
{
if (!stop_a_enabled)
return;
prom_printf("\n");
flush_user_windows();
prom_cmdline();
}
int serial_console = -1;
int stop_a_enabled = 1;
static int __init topology_init(void)
{
int i, err;
err = -ENOMEM;
/* Count the number of physically present processors in
* the machine, even on uniprocessor, so that /proc/cpuinfo
* output is consistent with 2.4.x
*/
ncpus_probed = 0;
while (!cpu_find_by_instance(ncpus_probed, NULL, NULL))
ncpus_probed++;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_possible(i)) {
struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);
if (p) {
memset(p, 0, sizeof(*p));
register_cpu(p, i, NULL);
err = 0;
}
}
}
return err;
}
subsys_initcall(topology_init);
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