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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>
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Benjamin Herrenschmidt
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Sep 20, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,4 @@ | ||
| obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o | ||
| obj-y += opal-rtc.o opal-nvram.o | ||
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| obj-$(CONFIG_SMP) += smp.o |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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. | ||
| */ | ||
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| #define DEBUG | ||
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| #include <linux/kernel.h> | ||
| #include <linux/init.h> | ||
| #include <linux/of.h> | ||
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| #include <asm/opal.h> | ||
| #include <asm/machdep.h> | ||
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| static unsigned int nvram_size; | ||
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| static ssize_t opal_nvram_size(void) | ||
| { | ||
| return nvram_size; | ||
| } | ||
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| static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index) | ||
| { | ||
| s64 rc; | ||
| int off; | ||
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| 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; | ||
| } | ||
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| static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index) | ||
| { | ||
| s64 rc = OPAL_BUSY; | ||
| int off; | ||
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| if (*index >= nvram_size) | ||
| return 0; | ||
| off = *index; | ||
| if ((off + count) > nvram_size) | ||
| count = nvram_size - off; | ||
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| 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; | ||
| } | ||
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| void __init opal_nvram_init(void) | ||
| { | ||
| struct device_node *np; | ||
| const u32 *nbytes_p; | ||
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| np = of_find_compatible_node(NULL, NULL, "ibm,opal-nvram"); | ||
| if (np == NULL) | ||
| return; | ||
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| nbytes_p = of_get_property(np, "#bytes", NULL); | ||
| if (!nbytes_p) { | ||
| of_node_put(np); | ||
| return; | ||
| } | ||
| nvram_size = *nbytes_p; | ||
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| printk(KERN_INFO "OPAL nvram setup, %u bytes\n", nvram_size); | ||
| of_node_put(np); | ||
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| ppc_md.nvram_read = opal_nvram_read; | ||
| ppc_md.nvram_write = opal_nvram_write; | ||
| ppc_md.nvram_size = opal_nvram_size; | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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. | ||
| */ | ||
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| #include <linux/kernel.h> | ||
| #include <linux/time.h> | ||
| #include <linux/bcd.h> | ||
| #include <linux/rtc.h> | ||
| #include <linux/delay.h> | ||
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| #include <asm/opal.h> | ||
| #include <asm/firmware.h> | ||
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| 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); | ||
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| GregorianDay(tm); | ||
| } | ||
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| 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; | ||
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| 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); | ||
| } | ||
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| void opal_get_rtc_time(struct rtc_time *tm) | ||
| { | ||
| long rc = OPAL_BUSY; | ||
| u32 y_m_d; | ||
| u64 h_m_s_ms; | ||
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| 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); | ||
| } | ||
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| int opal_set_rtc_time(struct rtc_time *tm) | ||
| { | ||
| long rc = OPAL_BUSY; | ||
| u32 y_m_d = 0; | ||
| u64 h_m_s_ms = 0; | ||
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| 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)); | ||
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| 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; | ||
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| 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; | ||
| } |
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