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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-19 13:44:57 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-20 02:09:50 -0400
commit14a43e69ed257a1fadadf9fea2c05adb1686419f (patch)
tree82ac1fccd465e7a58533c17d14792ceba73fa63e /arch/powerpc/platforms/powernv
parent817c21ad9a1f00926f080265493923ada3458c63 (diff)
powerpc/powernv: Basic support for OPAL
Add definition of OPAL interfaces along with the wrappers to call into OPAL runtime and the early device-tree parsing hook to locate the OPAL runtime firmware. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/powernv')
-rw-r--r--arch/powerpc/platforms/powernv/Kconfig9
-rw-r--r--arch/powerpc/platforms/powernv/Makefile2
-rw-r--r--arch/powerpc/platforms/powernv/opal-wrappers.S101
-rw-r--r--arch/powerpc/platforms/powernv/opal.c154
-rw-r--r--arch/powerpc/platforms/powernv/setup.c6
-rw-r--r--arch/powerpc/platforms/powernv/smp.c25
6 files changed, 293 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/powernv/Kconfig b/arch/powerpc/platforms/powernv/Kconfig
index 24700e8df19c..74fea5c21839 100644
--- a/arch/powerpc/platforms/powernv/Kconfig
+++ b/arch/powerpc/platforms/powernv/Kconfig
@@ -1,11 +1,16 @@
1config PPC_POWERNV 1config PPC_POWERNV
2 depends on PPC64 && PPC_BOOK3S 2 depends on PPC64 && PPC_BOOK3S
3 bool "IBM PowerNV (Non-Virtualized) platform support" 3 bool "IBM PowerNV (Non-Virtualized) platform support"
4 select PPC_RTAS
5 select PPC_NATIVE 4 select PPC_NATIVE
6 select PPC_XICS 5 select PPC_XICS
7 select PPC_ICP_NATIVE 6 select PPC_ICP_NATIVE
8 select PPC_ICS_RTAS
9 select PPC_P7_NAP 7 select PPC_P7_NAP
10 select PPC_PCI_CHOICE if EMBEDDED 8 select PPC_PCI_CHOICE if EMBEDDED
11 default y 9 default y
10
11config PPC_POWERNV_RTAS
12 depends on PPC_POWERNV
13 bool "Support for RTAS based PowerNV platforms such as BML"
14 default y
15 select PPC_ICS_RTAS
16 select PPC_RTAS
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 497133027ae5..8f69c0db612c 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -1,2 +1,2 @@
1obj-y += setup.o opal-takeover.o 1obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o
2obj-$(CONFIG_SMP) += smp.o 2obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
new file mode 100644
index 000000000000..4a3f46d8533e
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -0,0 +1,101 @@
1/*
2 * PowerNV OPAL API wrappers
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#include <asm/ppc_asm.h>
13#include <asm/hvcall.h>
14#include <asm/asm-offsets.h>
15#include <asm/opal.h>
16
17/* TODO:
18 *
19 * - Trace irqs in/off (needs saving/restoring all args, argh...)
20 * - Get r11 feed up by Dave so I can have better register usage
21 */
22#define OPAL_CALL(name, token) \
23 _GLOBAL(name); \
24 mflr r0; \
25 mfcr r12; \
26 std r0,16(r1); \
27 std r12,8(r1); \
28 std r1,PACAR1(r13); \
29 li r0,0; \
30 mfmsr r12; \
31 ori r0,r0,MSR_EE; \
32 std r12,PACASAVEDMSR(r13); \
33 andc r12,r12,r0; \
34 mtmsrd r12,1; \
35 LOAD_REG_ADDR(r0,.opal_return); \
36 mtlr r0; \
37 li r0,MSR_DR|MSR_IR; \
38 andc r12,r12,r0; \
39 li r0,token; \
40 mtspr SPRN_HSRR1,r12; \
41 LOAD_REG_ADDR(r11,opal); \
42 ld r12,8(r11); \
43 ld r2,0(r11); \
44 mtspr SPRN_HSRR0,r12; \
45 hrfid
46
47_STATIC(opal_return)
48 ld r2,PACATOC(r13);
49 ld r4,8(r1);
50 ld r5,16(r1);
51 ld r6,PACASAVEDMSR(r13);
52 mtspr SPRN_SRR0,r5;
53 mtspr SPRN_SRR1,r6;
54 mtcr r4;
55 rfid
56
57OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
58OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
59OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
60OPAL_CALL(opal_rtc_read, OPAL_RTC_READ);
61OPAL_CALL(opal_rtc_write, OPAL_RTC_WRITE);
62OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN);
63OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT);
64OPAL_CALL(opal_read_nvram, OPAL_READ_NVRAM);
65OPAL_CALL(opal_write_nvram, OPAL_WRITE_NVRAM);
66OPAL_CALL(opal_handle_interrupt, OPAL_HANDLE_INTERRUPT);
67OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
68OPAL_CALL(opal_pci_set_hub_tce_memory, OPAL_PCI_SET_HUB_TCE_MEMORY);
69OPAL_CALL(opal_pci_set_phb_tce_memory, OPAL_PCI_SET_PHB_TCE_MEMORY);
70OPAL_CALL(opal_pci_config_read_byte, OPAL_PCI_CONFIG_READ_BYTE);
71OPAL_CALL(opal_pci_config_read_half_word, OPAL_PCI_CONFIG_READ_HALF_WORD);
72OPAL_CALL(opal_pci_config_read_word, OPAL_PCI_CONFIG_READ_WORD);
73OPAL_CALL(opal_pci_config_write_byte, OPAL_PCI_CONFIG_WRITE_BYTE);
74OPAL_CALL(opal_pci_config_write_half_word, OPAL_PCI_CONFIG_WRITE_HALF_WORD);
75OPAL_CALL(opal_pci_config_write_word, OPAL_PCI_CONFIG_WRITE_WORD);
76OPAL_CALL(opal_set_xive, OPAL_SET_XIVE);
77OPAL_CALL(opal_get_xive, OPAL_GET_XIVE);
78OPAL_CALL(opal_register_exception_handler, OPAL_REGISTER_OPAL_EXCEPTION_HANDLER);
79OPAL_CALL(opal_pci_eeh_freeze_status, OPAL_PCI_EEH_FREEZE_STATUS);
80OPAL_CALL(opal_pci_eeh_freeze_clear, OPAL_PCI_EEH_FREEZE_CLEAR);
81OPAL_CALL(opal_pci_shpc, OPAL_PCI_SHPC);
82OPAL_CALL(opal_pci_phb_mmio_enable, OPAL_PCI_PHB_MMIO_ENABLE);
83OPAL_CALL(opal_pci_set_phb_mem_window, OPAL_PCI_SET_PHB_MEM_WINDOW);
84OPAL_CALL(opal_pci_map_pe_mmio_window, OPAL_PCI_MAP_PE_MMIO_WINDOW);
85OPAL_CALL(opal_pci_set_phb_table_memory, OPAL_PCI_SET_PHB_TABLE_MEMORY);
86OPAL_CALL(opal_pci_set_pe, OPAL_PCI_SET_PE);
87OPAL_CALL(opal_pci_set_peltv, OPAL_PCI_SET_PELTV);
88OPAL_CALL(opal_pci_set_mve, OPAL_PCI_SET_MVE);
89OPAL_CALL(opal_pci_set_mve_enable, OPAL_PCI_SET_MVE_ENABLE);
90OPAL_CALL(opal_pci_get_xive_reissue, OPAL_PCI_GET_XIVE_REISSUE);
91OPAL_CALL(opal_pci_set_xive_reissue, OPAL_PCI_SET_XIVE_REISSUE);
92OPAL_CALL(opal_pci_set_xive_pe, OPAL_PCI_SET_XIVE_PE);
93OPAL_CALL(opal_get_xive_source, OPAL_GET_XIVE_SOURCE);
94OPAL_CALL(opal_get_msi_32, OPAL_GET_MSI_32);
95OPAL_CALL(opal_get_msi_64, OPAL_GET_MSI_64);
96OPAL_CALL(opal_start_cpu, OPAL_START_CPU);
97OPAL_CALL(opal_query_cpu_status, OPAL_QUERY_CPU_STATUS);
98OPAL_CALL(opal_write_oppanel, OPAL_WRITE_OPPANEL);
99OPAL_CALL(opal_pci_map_pe_dma_window, OPAL_PCI_MAP_PE_DMA_WINDOW);
100OPAL_CALL(opal_pci_map_pe_dma_window_real, OPAL_PCI_MAP_PE_DMA_WINDOW_REAL);
101OPAL_CALL(opal_pci_reset, OPAL_PCI_RESET);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
new file mode 100644
index 000000000000..8d5510784cc2
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -0,0 +1,154 @@
1/*
2 * PowerNV OPAL high level interfaces
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#undef DEBUG
13
14#include <linux/types.h>
15#include <linux/of.h>
16#include <linux/of_platform.h>
17#include <asm/opal.h>
18#include <asm/firmware.h>
19
20#include "powernv.h"
21
22struct opal {
23 u64 base;
24 u64 entry;
25} opal;
26
27static struct device_node *opal_node;
28static DEFINE_SPINLOCK(opal_write_lock);
29
30int __init early_init_dt_scan_opal(unsigned long node,
31 const char *uname, int depth, void *data)
32{
33 const void *basep, *entryp;
34 unsigned long basesz, entrysz;
35
36 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
37 return 0;
38
39 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
40 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
41
42 if (!basep || !entryp)
43 return 1;
44
45 opal.base = of_read_number(basep, basesz/4);
46 opal.entry = of_read_number(entryp, entrysz/4);
47
48 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n",
49 opal.base, basep, basesz);
50 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
51 opal.entry, entryp, entrysz);
52
53 powerpc_firmware_features |= FW_FEATURE_OPAL;
54 if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
55 powerpc_firmware_features |= FW_FEATURE_OPALv2;
56 printk("OPAL V2 detected !\n");
57 } else {
58 printk("OPAL V1 detected !\n");
59 }
60
61 return 1;
62}
63
64int opal_get_chars(uint32_t vtermno, char *buf, int count)
65{
66 s64 len, rc;
67 u64 evt;
68
69 if (!opal.entry)
70 return 0;
71 opal_poll_events(&evt);
72 if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
73 return 0;
74 len = count;
75 rc = opal_console_read(vtermno, &len, buf);
76 if (rc == OPAL_SUCCESS)
77 return len;
78 return 0;
79}
80
81int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
82{
83 int written = 0;
84 s64 len, rc = OPAL_BUSY;
85 unsigned long flags;
86 u64 evt;
87
88 if (!opal.entry)
89 return 0;
90
91 /* We want put_chars to be atomic to avoid mangling of hvsi
92 * packets. To do that, we first test for room and return
93 * -EAGAIN if there isn't enough
94 */
95 spin_lock_irqsave(&opal_write_lock, flags);
96 rc = opal_console_write_buffer_space(vtermno, &len);
97 if (rc || len < total_len) {
98 spin_unlock_irqrestore(&opal_write_lock, flags);
99 /* Closed -> drop characters */
100 if (rc)
101 return total_len;
102 opal_poll_events(&evt);
103 return -EAGAIN;
104 }
105
106 /* We still try to handle partial completions, though they
107 * should no longer happen.
108 */
109 while(total_len > 0 && (rc == OPAL_BUSY ||
110 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
111 len = total_len;
112 rc = opal_console_write(vtermno, &len, data);
113 if (rc == OPAL_SUCCESS) {
114 total_len -= len;
115 data += len;
116 written += len;
117 }
118 /* This is a bit nasty but we need that for the console to
119 * flush when there aren't any interrupts. We will clean
120 * things a bit later to limit that to synchronous path
121 * such as the kernel console and xmon/udbg
122 */
123 do
124 opal_poll_events(&evt);
125 while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
126 }
127 spin_unlock_irqrestore(&opal_write_lock, flags);
128 return written;
129}
130
131static int __init opal_init(void)
132{
133 struct device_node *np, *consoles;
134
135 opal_node = of_find_node_by_path("/ibm,opal");
136 if (!opal_node) {
137 pr_warn("opal: Node not found\n");
138 return -ENODEV;
139 }
140 if (firmware_has_feature(FW_FEATURE_OPALv2))
141 consoles = of_find_node_by_path("/ibm,opal/consoles");
142 else
143 consoles = of_node_get(opal_node);
144
145 /* Register serial ports */
146 for_each_child_of_node(consoles, np) {
147 if (strcmp(np->name, "serial"))
148 continue;
149 of_platform_device_create(np, NULL, NULL);
150 }
151 of_node_put(consoles);
152 return 0;
153}
154subsys_initcall(opal_init);
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 569f9cc4eb04..b6e5ff85cc6f 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -74,6 +74,12 @@ static void pnv_show_cpuinfo(struct seq_file *m)
74 if (root) 74 if (root)
75 model = of_get_property(root, "model", NULL); 75 model = of_get_property(root, "model", NULL);
76 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 76 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
77 if (firmware_has_feature(FW_FEATURE_OPALv2))
78 seq_printf(m, "firmware\t: OPAL v2\n");
79 else if (firmware_has_feature(FW_FEATURE_OPAL))
80 seq_printf(m, "firmware\t: OPAL v1\n");
81 else
82 seq_printf(m, "firmware\t: BML\n");
77 of_node_put(root); 83 of_node_put(root);
78} 84}
79 85
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
index 4f4ec3797eb6..e87736685243 100644
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -30,6 +30,7 @@
30#include <asm/vdso_datapage.h> 30#include <asm/vdso_datapage.h>
31#include <asm/cputhreads.h> 31#include <asm/cputhreads.h>
32#include <asm/xics.h> 32#include <asm/xics.h>
33#include <asm/opal.h>
33 34
34#include "powernv.h" 35#include "powernv.h"
35 36
@@ -62,6 +63,28 @@ static int pnv_smp_cpu_bootable(unsigned int nr)
62 return 1; 63 return 1;
63} 64}
64 65
66int __devinit pnv_smp_kick_cpu(int nr)
67{
68 unsigned int pcpu = get_hard_smp_processor_id(nr);
69 unsigned long start_here = __pa(*((unsigned long *)
70 generic_secondary_smp_init));
71 long rc;
72
73 BUG_ON(nr < 0 || nr >= NR_CPUS);
74
75 /* On OPAL v2 the CPU are still spinning inside OPAL itself,
76 * get them back now
77 */
78 if (firmware_has_feature(FW_FEATURE_OPALv2)) {
79 pr_devel("OPAL: Starting CPU %d (HW 0x%x)...\n", nr, pcpu);
80 rc = opal_start_cpu(pcpu, start_here);
81 if (rc != OPAL_SUCCESS)
82 pr_warn("OPAL Error %ld starting CPU %d\n",
83 rc, nr);
84 }
85 return smp_generic_kick_cpu(nr);
86}
87
65#ifdef CONFIG_HOTPLUG_CPU 88#ifdef CONFIG_HOTPLUG_CPU
66 89
67static int pnv_smp_cpu_disable(void) 90static int pnv_smp_cpu_disable(void)
@@ -127,7 +150,7 @@ static struct smp_ops_t pnv_smp_ops = {
127 .message_pass = smp_muxed_ipi_message_pass, 150 .message_pass = smp_muxed_ipi_message_pass,
128 .cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */ 151 .cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */
129 .probe = xics_smp_probe, 152 .probe = xics_smp_probe,
130 .kick_cpu = smp_generic_kick_cpu, 153 .kick_cpu = pnv_smp_kick_cpu,
131 .setup_cpu = pnv_smp_setup_cpu, 154 .setup_cpu = pnv_smp_setup_cpu,
132 .cpu_bootable = pnv_smp_cpu_bootable, 155 .cpu_bootable = pnv_smp_cpu_bootable,
133#ifdef CONFIG_HOTPLUG_CPU 156#ifdef CONFIG_HOTPLUG_CPU
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