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| 2 | |
| 3 | * Copyright (c) 2016 IBM Corporation.
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| 4 |
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| 5 |
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| 6 | #include "ops.h"
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| 7 | #include "stdio.h"
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| 8 | #include "io.h"
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| 9 | #include <libfdt.h>
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| 10 | #include "../include/asm/opal-api.h"
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| 11 |
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| 12 |
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| 13 | struct opal {
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| 14 | u64 base;
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| 15 | u64 entry;
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| 16 | } opal;
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| 17 |
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| 18 | static u32 opal_con_id;
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| 19 |
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| 20 |
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| 21 | int64_t opal_console_write(int64_t term_number, u64 *length, const u8 *buffer);
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| 22 | int64_t opal_console_read(int64_t term_number, uint64_t *length, u8 *buffer);
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| 23 | int64_t opal_console_write_buffer_space(uint64_t term_number, uint64_t *length);
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| 24 | int64_t opal_console_flush(uint64_t term_number);
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| 25 | int64_t opal_poll_events(uint64_t *outstanding_event_mask);
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| 26 |
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| 27 | void opal_kentry(unsigned long fdt_addr, void *vmlinux_addr);
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| 28 |
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| 29 | static int opal_con_open(void)
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| 30 | {
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| 31 | |
| 32 | * When OPAL loads the boot kernel it stashes the OPAL base and entry
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| 33 | * address in r8 and r9 so the kernel can use the OPAL console
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| 34 | * before unflattening the devicetree. While executing the wrapper will
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| 35 | * probably trash r8 and r9 so this kentry hook restores them before
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| 36 | * entering the decompressed kernel.
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| 37 |
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| 38 | platform_ops.kentry = opal_kentry;
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| 39 | return 0;
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| 40 | }
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| 41 |
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| 42 | static void opal_con_putc(unsigned char c)
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| 43 | {
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| 44 | int64_t rc;
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| 45 | uint64_t olen, len;
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| 46 |
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| 47 | do {
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| 48 | rc = opal_console_write_buffer_space(opal_con_id, &olen);
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| 49 | len = be64_to_cpu(olen);
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| 50 | if (rc)
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| 51 | return;
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| 52 | opal_poll_events(NULL);
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| 53 | } while (len < 1);
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| 54 |
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| 55 |
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| 56 | olen = cpu_to_be64(1);
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| 57 | opal_console_write(opal_con_id, &olen, &c);
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| 58 | }
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| 59 |
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| 60 | static void opal_con_close(void)
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| 61 | {
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| 62 | opal_console_flush(opal_con_id);
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| 63 | }
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| 64 |
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| 65 | static void opal_init(void)
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| 66 | {
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| 67 | void *opal_node;
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| 68 |
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| 69 | opal_node = finddevice("/ibm,opal");
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| 70 | if (!opal_node)
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| 71 | return;
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| 72 | if (getprop(opal_node, "opal-base-address", &opal.base, sizeof(u64)) < 0)
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| 73 | return;
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| 74 | opal.base = be64_to_cpu(opal.base);
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| 75 | if (getprop(opal_node, "opal-entry-address", &opal.entry, sizeof(u64)) < 0)
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| 76 | return;
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| 77 | opal.entry = be64_to_cpu(opal.entry);
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| 78 | }
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| 79 |
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| 80 | int opal_console_init(void *devp, struct serial_console_data *scdp)
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| 81 | {
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| 82 | opal_init();
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| 83 |
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| 84 | if (devp) {
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| 85 | int n = getprop(devp, "reg", &opal_con_id, sizeof(u32));
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| 86 | if (n != sizeof(u32))
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| 87 | return -1;
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| 88 | opal_con_id = be32_to_cpu(opal_con_id);
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| 89 | } else
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| 90 | opal_con_id = 0;
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| 91 |
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| 92 | scdp->open = opal_con_open;
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| 93 | scdp->putc = opal_con_putc;
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| 94 | scdp->close = opal_con_close;
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| 95 |
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| 96 | return 0;
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| 97 | }
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