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powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks 

Implements OPAL RTC and NVRAM support and wire all that up to
the powernv platform.

We use RTAS for RTC as a fallback if available. Using RTAS for nvram
is not supported yet, pending some rework/cleanup and generalization
of the pSeries & CHRP code. We also use RTAS fallbacks for power off
and reboot

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
wifi-calibration
Benjamin Herrenschmidt 2011-09-19 17:45:01 +00:00
parent ec27329ffb
commit 628daa8d5a
5 changed files with 230 additions and 22 deletions
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6
arch/powerpc/include/asm/opal.h
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@ -430,6 +430,12 @@ extern int opal_put_chars(uint32_t vtermno, const char *buf, int total_len);
extern void hvc_opal_init_early(void);
struct rtc_time;
extern int opal_set_rtc_time(struct rtc_time *tm);
extern void opal_get_rtc_time(struct rtc_time *tm);
extern unsigned long opal_get_boot_time(void);
extern void opal_nvram_init(void);
#endif /* __ASSEMBLY__ */
#endif /* __OPAL_H */

2
arch/powerpc/platforms/powernv/Makefile
View File

@ -1,2 +1,4 @@
obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o
obj-y += opal-rtc.o opal-nvram.o
obj-$(CONFIG_SMP) += smp.o

88
arch/powerpc/platforms/powernv/opal-nvram.c 100644
View File

@ -0,0 +1,88 @@
/*
* PowerNV nvram code.
*
* Copyright 2011 IBM Corp.
*
* 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 DEBUG
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <asm/opal.h>
#include <asm/machdep.h>
static unsigned int nvram_size;
static ssize_t opal_nvram_size(void)
{
return nvram_size;
}
static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index)
{
s64 rc;
int off;
if (*index >= nvram_size)
return 0;
off = *index;
if ((off + count) > nvram_size)
count = nvram_size - off;
rc = opal_read_nvram(__pa(buf), count, off);
if (rc != OPAL_SUCCESS)
return -EIO;
*index += count;
return count;
}
static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
{
s64 rc = OPAL_BUSY;
int off;
if (*index >= nvram_size)
return 0;
off = *index;
if ((off + count) > nvram_size)
count = nvram_size - off;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_write_nvram(__pa(buf), count, off);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
}
*index += count;
return count;
}
void __init opal_nvram_init(void)
{
struct device_node *np;
const u32 *nbytes_p;
np = of_find_compatible_node(NULL, NULL, "ibm,opal-nvram");
if (np == NULL)
return;
nbytes_p = of_get_property(np, "#bytes", NULL);
if (!nbytes_p) {
of_node_put(np);
return;
}
nvram_size = *nbytes_p;
printk(KERN_INFO "OPAL nvram setup, %u bytes\n", nvram_size);
of_node_put(np);
ppc_md.nvram_read = opal_nvram_read;
ppc_md.nvram_write = opal_nvram_write;
ppc_md.nvram_size = opal_nvram_size;
}

97
arch/powerpc/platforms/powernv/opal-rtc.c 100644
View File

@ -0,0 +1,97 @@
/*
* PowerNV Real Time Clock.
*
* Copyright 2011 IBM Corp.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <asm/opal.h>
#include <asm/firmware.h>
static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
{
tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) +
bcd2bin((y_m_d >> 16) & 0xff)) - 1900;
tm->tm_mon = bcd2bin((y_m_d >> 8) & 0xff) - 1;
tm->tm_mday = bcd2bin(y_m_d & 0xff);
tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff);
tm->tm_min = bcd2bin((h_m_s_ms >> 48) & 0xff);
tm->tm_sec = bcd2bin((h_m_s_ms >> 40) & 0xff);
GregorianDay(tm);
}
unsigned long __init opal_get_boot_time(void)
{
struct rtc_time tm;
u32 y_m_d;
u64 h_m_s_ms;
long rc = OPAL_BUSY;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_rtc_read(&y_m_d, &h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
mdelay(10);
}
if (rc != OPAL_SUCCESS)
return 0;
opal_to_tm(y_m_d, h_m_s_ms, &tm);
return mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
}
void opal_get_rtc_time(struct rtc_time *tm)
{
long rc = OPAL_BUSY;
u32 y_m_d;
u64 h_m_s_ms;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_rtc_read(&y_m_d, &h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
mdelay(10);
}
if (rc != OPAL_SUCCESS)
return;
opal_to_tm(y_m_d, h_m_s_ms, tm);
}
int opal_set_rtc_time(struct rtc_time *tm)
{
long rc = OPAL_BUSY;
u32 y_m_d = 0;
u64 h_m_s_ms = 0;
y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
y_m_d |= ((u32)bin2bcd(tm->tm_mday));
h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_rtc_write(y_m_d, h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
mdelay(10);
}
return rc == OPAL_SUCCESS ? 0 : -EIO;
}

59
arch/powerpc/platforms/powernv/setup.c
View File

@ -29,7 +29,9 @@
#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/xics.h>
#include <asm/rtas.h>
#include <asm/opal.h>
#include <asm/xics.h>
#include "powernv.h"
@ -40,7 +42,9 @@ static void __init pnv_setup_arch(void)
/* XXX PCI */
/* XXX NVRAM */
/* Setup RTC and NVRAM callbacks */
if (firmware_has_feature(FW_FEATURE_OPAL))
opal_nvram_init();
/* Enable NAP mode */
powersave_nap = 1;
@ -118,20 +122,6 @@ static void __noreturn pnv_halt(void)
pnv_power_off();
}
static unsigned long __init pnv_get_boot_time(void)
{
return 0;
}
static void pnv_get_rtc_time(struct rtc_time *rtc_tm)
{
}
static int pnv_set_rtc_time(struct rtc_time *tm)
{
return 0;
}
static void pnv_progress(char *s, unsigned short hex)
{
}
@ -143,6 +133,30 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
}
#endif /* CONFIG_KEXEC */
static void __init pnv_setup_machdep_opal(void)
{
ppc_md.get_boot_time = opal_get_boot_time;
ppc_md.get_rtc_time = opal_get_rtc_time;
ppc_md.set_rtc_time = opal_set_rtc_time;
ppc_md.restart = pnv_restart;
ppc_md.power_off = pnv_power_off;
ppc_md.halt = pnv_halt;
}
#ifdef CONFIG_PPC_POWERNV_RTAS
static void __init pnv_setup_machdep_rtas(void)
{
if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
ppc_md.get_boot_time = rtas_get_boot_time;
ppc_md.get_rtc_time = rtas_get_rtc_time;
ppc_md.set_rtc_time = rtas_set_rtc_time;
}
ppc_md.restart = rtas_restart;
ppc_md.power_off = rtas_power_off;
ppc_md.halt = rtas_halt;
}
#endif /* CONFIG_PPC_POWERNV_RTAS */
static int __init pnv_probe(void)
{
unsigned long root = of_get_flat_dt_root();
@ -152,6 +166,13 @@ static int __init pnv_probe(void)
hpte_init_native();
if (firmware_has_feature(FW_FEATURE_OPAL))
pnv_setup_machdep_opal();
#ifdef CONFIG_PPC_POWERNV_RTAS
else if (rtas.base)
pnv_setup_machdep_rtas();
#endif /* CONFIG_PPC_POWERNV_RTAS */
pr_debug("PowerNV detected !\n");
return 1;
@ -160,16 +181,10 @@ static int __init pnv_probe(void)
define_machine(powernv) {
.name = "PowerNV",
.probe = pnv_probe,
.setup_arch = pnv_setup_arch,
.init_early = pnv_init_early,
.setup_arch = pnv_setup_arch,
.init_IRQ = pnv_init_IRQ,
.show_cpuinfo = pnv_show_cpuinfo,
.restart = pnv_restart,
.power_off = pnv_power_off,
.halt = pnv_halt,
.get_boot_time = pnv_get_boot_time,
.get_rtc_time = pnv_get_rtc_time,
.set_rtc_time = pnv_set_rtc_time,
.progress = pnv_progress,
.power_save = power7_idle,
.calibrate_decr = generic_calibrate_decr,