Commit 628daa8d5abfd904a7329a660c5c374212230123
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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>
Showing 5 changed files with 229 additions and 21 deletions Side-by-side Diff
arch/powerpc/include/asm/opal.h
... | ... | @@ -430,6 +430,12 @@ |
430 | 430 | |
431 | 431 | extern void hvc_opal_init_early(void); |
432 | 432 | |
433 | +struct rtc_time; | |
434 | +extern int opal_set_rtc_time(struct rtc_time *tm); | |
435 | +extern void opal_get_rtc_time(struct rtc_time *tm); | |
436 | +extern unsigned long opal_get_boot_time(void); | |
437 | +extern void opal_nvram_init(void); | |
438 | + | |
433 | 439 | #endif /* __ASSEMBLY__ */ |
434 | 440 | |
435 | 441 | #endif /* __OPAL_H */ |
arch/powerpc/platforms/powernv/Makefile
arch/powerpc/platforms/powernv/opal-nvram.c
1 | +/* | |
2 | + * PowerNV nvram code. | |
3 | + * | |
4 | + * Copyright 2011 IBM Corp. | |
5 | + * | |
6 | + * This program is free software; you can redistribute it and/or | |
7 | + * modify it under the terms of the GNU General Public License | |
8 | + * as published by the Free Software Foundation; either version | |
9 | + * 2 of the License, or (at your option) any later version. | |
10 | + */ | |
11 | + | |
12 | +#define DEBUG | |
13 | + | |
14 | +#include <linux/kernel.h> | |
15 | +#include <linux/init.h> | |
16 | +#include <linux/of.h> | |
17 | + | |
18 | +#include <asm/opal.h> | |
19 | +#include <asm/machdep.h> | |
20 | + | |
21 | +static unsigned int nvram_size; | |
22 | + | |
23 | +static ssize_t opal_nvram_size(void) | |
24 | +{ | |
25 | + return nvram_size; | |
26 | +} | |
27 | + | |
28 | +static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index) | |
29 | +{ | |
30 | + s64 rc; | |
31 | + int off; | |
32 | + | |
33 | + if (*index >= nvram_size) | |
34 | + return 0; | |
35 | + off = *index; | |
36 | + if ((off + count) > nvram_size) | |
37 | + count = nvram_size - off; | |
38 | + rc = opal_read_nvram(__pa(buf), count, off); | |
39 | + if (rc != OPAL_SUCCESS) | |
40 | + return -EIO; | |
41 | + *index += count; | |
42 | + return count; | |
43 | +} | |
44 | + | |
45 | +static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index) | |
46 | +{ | |
47 | + s64 rc = OPAL_BUSY; | |
48 | + int off; | |
49 | + | |
50 | + if (*index >= nvram_size) | |
51 | + return 0; | |
52 | + off = *index; | |
53 | + if ((off + count) > nvram_size) | |
54 | + count = nvram_size - off; | |
55 | + | |
56 | + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
57 | + rc = opal_write_nvram(__pa(buf), count, off); | |
58 | + if (rc == OPAL_BUSY_EVENT) | |
59 | + opal_poll_events(NULL); | |
60 | + } | |
61 | + *index += count; | |
62 | + return count; | |
63 | +} | |
64 | + | |
65 | +void __init opal_nvram_init(void) | |
66 | +{ | |
67 | + struct device_node *np; | |
68 | + const u32 *nbytes_p; | |
69 | + | |
70 | + np = of_find_compatible_node(NULL, NULL, "ibm,opal-nvram"); | |
71 | + if (np == NULL) | |
72 | + return; | |
73 | + | |
74 | + nbytes_p = of_get_property(np, "#bytes", NULL); | |
75 | + if (!nbytes_p) { | |
76 | + of_node_put(np); | |
77 | + return; | |
78 | + } | |
79 | + nvram_size = *nbytes_p; | |
80 | + | |
81 | + printk(KERN_INFO "OPAL nvram setup, %u bytes\n", nvram_size); | |
82 | + of_node_put(np); | |
83 | + | |
84 | + ppc_md.nvram_read = opal_nvram_read; | |
85 | + ppc_md.nvram_write = opal_nvram_write; | |
86 | + ppc_md.nvram_size = opal_nvram_size; | |
87 | +} |
arch/powerpc/platforms/powernv/opal-rtc.c
1 | +/* | |
2 | + * PowerNV Real Time Clock. | |
3 | + * | |
4 | + * Copyright 2011 IBM Corp. | |
5 | + * | |
6 | + * This program is free software; you can redistribute it and/or | |
7 | + * modify it under the terms of the GNU General Public License | |
8 | + * as published by the Free Software Foundation; either version | |
9 | + * 2 of the License, or (at your option) any later version. | |
10 | + */ | |
11 | + | |
12 | + | |
13 | +#include <linux/kernel.h> | |
14 | +#include <linux/time.h> | |
15 | +#include <linux/bcd.h> | |
16 | +#include <linux/rtc.h> | |
17 | +#include <linux/delay.h> | |
18 | + | |
19 | +#include <asm/opal.h> | |
20 | +#include <asm/firmware.h> | |
21 | + | |
22 | +static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm) | |
23 | +{ | |
24 | + tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) + | |
25 | + bcd2bin((y_m_d >> 16) & 0xff)) - 1900; | |
26 | + tm->tm_mon = bcd2bin((y_m_d >> 8) & 0xff) - 1; | |
27 | + tm->tm_mday = bcd2bin(y_m_d & 0xff); | |
28 | + tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff); | |
29 | + tm->tm_min = bcd2bin((h_m_s_ms >> 48) & 0xff); | |
30 | + tm->tm_sec = bcd2bin((h_m_s_ms >> 40) & 0xff); | |
31 | + | |
32 | + GregorianDay(tm); | |
33 | +} | |
34 | + | |
35 | +unsigned long __init opal_get_boot_time(void) | |
36 | +{ | |
37 | + struct rtc_time tm; | |
38 | + u32 y_m_d; | |
39 | + u64 h_m_s_ms; | |
40 | + long rc = OPAL_BUSY; | |
41 | + | |
42 | + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
43 | + rc = opal_rtc_read(&y_m_d, &h_m_s_ms); | |
44 | + if (rc == OPAL_BUSY_EVENT) | |
45 | + opal_poll_events(NULL); | |
46 | + else | |
47 | + mdelay(10); | |
48 | + } | |
49 | + if (rc != OPAL_SUCCESS) | |
50 | + return 0; | |
51 | + opal_to_tm(y_m_d, h_m_s_ms, &tm); | |
52 | + return mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, | |
53 | + tm.tm_hour, tm.tm_min, tm.tm_sec); | |
54 | +} | |
55 | + | |
56 | +void opal_get_rtc_time(struct rtc_time *tm) | |
57 | +{ | |
58 | + long rc = OPAL_BUSY; | |
59 | + u32 y_m_d; | |
60 | + u64 h_m_s_ms; | |
61 | + | |
62 | + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
63 | + rc = opal_rtc_read(&y_m_d, &h_m_s_ms); | |
64 | + if (rc == OPAL_BUSY_EVENT) | |
65 | + opal_poll_events(NULL); | |
66 | + else | |
67 | + mdelay(10); | |
68 | + } | |
69 | + if (rc != OPAL_SUCCESS) | |
70 | + return; | |
71 | + opal_to_tm(y_m_d, h_m_s_ms, tm); | |
72 | +} | |
73 | + | |
74 | +int opal_set_rtc_time(struct rtc_time *tm) | |
75 | +{ | |
76 | + long rc = OPAL_BUSY; | |
77 | + u32 y_m_d = 0; | |
78 | + u64 h_m_s_ms = 0; | |
79 | + | |
80 | + y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24; | |
81 | + y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16; | |
82 | + y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8; | |
83 | + y_m_d |= ((u32)bin2bcd(tm->tm_mday)); | |
84 | + | |
85 | + h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56; | |
86 | + h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48; | |
87 | + h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40; | |
88 | + | |
89 | + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
90 | + rc = opal_rtc_write(y_m_d, h_m_s_ms); | |
91 | + if (rc == OPAL_BUSY_EVENT) | |
92 | + opal_poll_events(NULL); | |
93 | + else | |
94 | + mdelay(10); | |
95 | + } | |
96 | + return rc == OPAL_SUCCESS ? 0 : -EIO; | |
97 | +} |
arch/powerpc/platforms/powernv/setup.c
... | ... | @@ -29,7 +29,9 @@ |
29 | 29 | #include <asm/machdep.h> |
30 | 30 | #include <asm/firmware.h> |
31 | 31 | #include <asm/xics.h> |
32 | +#include <asm/rtas.h> | |
32 | 33 | #include <asm/opal.h> |
34 | +#include <asm/xics.h> | |
33 | 35 | |
34 | 36 | #include "powernv.h" |
35 | 37 | |
... | ... | @@ -40,7 +42,9 @@ |
40 | 42 | |
41 | 43 | /* XXX PCI */ |
42 | 44 | |
43 | - /* XXX NVRAM */ | |
45 | + /* Setup RTC and NVRAM callbacks */ | |
46 | + if (firmware_has_feature(FW_FEATURE_OPAL)) | |
47 | + opal_nvram_init(); | |
44 | 48 | |
45 | 49 | /* Enable NAP mode */ |
46 | 50 | powersave_nap = 1; |
47 | 51 | |
48 | 52 | |
49 | 53 | |
50 | 54 | |
51 | 55 | |
52 | 56 | |
53 | 57 | |
54 | 58 | |
55 | 59 | |
56 | 60 | |
... | ... | @@ -118,31 +122,41 @@ |
118 | 122 | pnv_power_off(); |
119 | 123 | } |
120 | 124 | |
121 | -static unsigned long __init pnv_get_boot_time(void) | |
125 | +static void pnv_progress(char *s, unsigned short hex) | |
122 | 126 | { |
123 | - return 0; | |
124 | 127 | } |
125 | 128 | |
126 | -static void pnv_get_rtc_time(struct rtc_time *rtc_tm) | |
129 | +#ifdef CONFIG_KEXEC | |
130 | +static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) | |
127 | 131 | { |
132 | + xics_kexec_teardown_cpu(secondary); | |
128 | 133 | } |
134 | +#endif /* CONFIG_KEXEC */ | |
129 | 135 | |
130 | -static int pnv_set_rtc_time(struct rtc_time *tm) | |
136 | +static void __init pnv_setup_machdep_opal(void) | |
131 | 137 | { |
132 | - return 0; | |
138 | + ppc_md.get_boot_time = opal_get_boot_time; | |
139 | + ppc_md.get_rtc_time = opal_get_rtc_time; | |
140 | + ppc_md.set_rtc_time = opal_set_rtc_time; | |
141 | + ppc_md.restart = pnv_restart; | |
142 | + ppc_md.power_off = pnv_power_off; | |
143 | + ppc_md.halt = pnv_halt; | |
133 | 144 | } |
134 | 145 | |
135 | -static void pnv_progress(char *s, unsigned short hex) | |
146 | +#ifdef CONFIG_PPC_POWERNV_RTAS | |
147 | +static void __init pnv_setup_machdep_rtas(void) | |
136 | 148 | { |
149 | + if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { | |
150 | + ppc_md.get_boot_time = rtas_get_boot_time; | |
151 | + ppc_md.get_rtc_time = rtas_get_rtc_time; | |
152 | + ppc_md.set_rtc_time = rtas_set_rtc_time; | |
153 | + } | |
154 | + ppc_md.restart = rtas_restart; | |
155 | + ppc_md.power_off = rtas_power_off; | |
156 | + ppc_md.halt = rtas_halt; | |
137 | 157 | } |
158 | +#endif /* CONFIG_PPC_POWERNV_RTAS */ | |
138 | 159 | |
139 | -#ifdef CONFIG_KEXEC | |
140 | -static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) | |
141 | -{ | |
142 | - xics_kexec_teardown_cpu(secondary); | |
143 | -} | |
144 | -#endif /* CONFIG_KEXEC */ | |
145 | - | |
146 | 160 | static int __init pnv_probe(void) |
147 | 161 | { |
148 | 162 | unsigned long root = of_get_flat_dt_root(); |
... | ... | @@ -152,6 +166,13 @@ |
152 | 166 | |
153 | 167 | hpte_init_native(); |
154 | 168 | |
169 | + if (firmware_has_feature(FW_FEATURE_OPAL)) | |
170 | + pnv_setup_machdep_opal(); | |
171 | +#ifdef CONFIG_PPC_POWERNV_RTAS | |
172 | + else if (rtas.base) | |
173 | + pnv_setup_machdep_rtas(); | |
174 | +#endif /* CONFIG_PPC_POWERNV_RTAS */ | |
175 | + | |
155 | 176 | pr_debug("PowerNV detected !\n"); |
156 | 177 | |
157 | 178 | return 1; |
158 | 179 | |
159 | 180 | |
... | ... | @@ -160,16 +181,10 @@ |
160 | 181 | define_machine(powernv) { |
161 | 182 | .name = "PowerNV", |
162 | 183 | .probe = pnv_probe, |
163 | - .setup_arch = pnv_setup_arch, | |
164 | 184 | .init_early = pnv_init_early, |
185 | + .setup_arch = pnv_setup_arch, | |
165 | 186 | .init_IRQ = pnv_init_IRQ, |
166 | 187 | .show_cpuinfo = pnv_show_cpuinfo, |
167 | - .restart = pnv_restart, | |
168 | - .power_off = pnv_power_off, | |
169 | - .halt = pnv_halt, | |
170 | - .get_boot_time = pnv_get_boot_time, | |
171 | - .get_rtc_time = pnv_get_rtc_time, | |
172 | - .set_rtc_time = pnv_set_rtc_time, | |
173 | 188 | .progress = pnv_progress, |
174 | 189 | .power_save = power7_idle, |
175 | 190 | .calibrate_decr = generic_calibrate_decr, |