1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * udbg debug output routine via GELIC UDP broadcasts
4 *
5 * Copyright (C) 2007 Sony Computer Entertainment Inc.
6 * Copyright 2006, 2007 Sony Corporation
7 * Copyright (C) 2010 Hector Martin <hector@marcansoft.com>
8 * Copyright (C) 2011 Andre Heider <a.heider@gmail.com>
9 */
10
11 #include <linux/if_ether.h>
12 #include <linux/etherdevice.h>
13 #include <linux/if_vlan.h>
14 #include <linux/ip.h>
15 #include <linux/udp.h>
16
17 #include <asm/io.h>
18 #include <asm/udbg.h>
19 #include <asm/lv1call.h>
20
21 #define GELIC_BUS_ID 1
22 #define GELIC_DEVICE_ID 0
23 #define GELIC_DEBUG_PORT 18194
24 #define GELIC_MAX_MESSAGE_SIZE 1000
25
26 #define GELIC_LV1_GET_MAC_ADDRESS 1
27 #define GELIC_LV1_GET_VLAN_ID 4
28 #define GELIC_LV1_VLAN_TX_ETHERNET_0 2
29
30 #define GELIC_DESCR_DMA_STAT_MASK 0xf0000000
31 #define GELIC_DESCR_DMA_CARDOWNED 0xa0000000
32
33 #define GELIC_DESCR_TX_DMA_IKE 0x00080000
34 #define GELIC_DESCR_TX_DMA_NO_CHKSUM 0x00000000
35 #define GELIC_DESCR_TX_DMA_FRAME_TAIL 0x00040000
36
37 #define GELIC_DESCR_DMA_CMD_NO_CHKSUM (GELIC_DESCR_DMA_CARDOWNED | \
38 GELIC_DESCR_TX_DMA_IKE | \
39 GELIC_DESCR_TX_DMA_NO_CHKSUM)
40
41 static u64 bus_addr;
42
43 struct gelic_descr {
44 /* as defined by the hardware */
45 __be32 buf_addr;
46 __be32 buf_size;
47 __be32 next_descr_addr;
48 __be32 dmac_cmd_status;
49 __be32 result_size;
50 __be32 valid_size; /* all zeroes for tx */
51 __be32 data_status;
52 __be32 data_error; /* all zeroes for tx */
53 } __attribute__((aligned(32)));
54
55 struct debug_block {
56 struct gelic_descr descr;
57 u8 pkt[1520];
58 } __packed;
59
60 static __iomem struct ethhdr *h_eth;
61 static __iomem struct vlan_hdr *h_vlan;
62 static __iomem struct iphdr *h_ip;
63 static __iomem struct udphdr *h_udp;
64
65 static __iomem char *pmsg;
66 static __iomem char *pmsgc;
67
68 static __iomem struct debug_block dbg __attribute__((aligned(32)));
69
70 static int header_size;
71
map_dma_mem(int bus_id,int dev_id,void * start,size_t len,u64 * real_bus_addr)72 static void map_dma_mem(int bus_id, int dev_id, void *start, size_t len,
73 u64 *real_bus_addr)
74 {
75 s64 result;
76 u64 real_addr = ((u64)start) & 0x0fffffffffffffffUL;
77 u64 real_end = real_addr + len;
78 u64 map_start = real_addr & ~0xfff;
79 u64 map_end = (real_end + 0xfff) & ~0xfff;
80 u64 bus_addr = 0;
81
82 u64 flags = 0xf800000000000000UL;
83
84 result = lv1_allocate_device_dma_region(bus_id, dev_id,
85 map_end - map_start, 12, 0,
86 &bus_addr);
87 if (result)
88 lv1_panic(0);
89
90 result = lv1_map_device_dma_region(bus_id, dev_id, map_start,
91 bus_addr, map_end - map_start,
92 flags);
93 if (result)
94 lv1_panic(0);
95
96 *real_bus_addr = bus_addr + real_addr - map_start;
97 }
98
unmap_dma_mem(int bus_id,int dev_id,u64 bus_addr,size_t len)99 static int unmap_dma_mem(int bus_id, int dev_id, u64 bus_addr, size_t len)
100 {
101 s64 result;
102 u64 real_bus_addr;
103
104 real_bus_addr = bus_addr & ~0xfff;
105 len += bus_addr - real_bus_addr;
106 len = (len + 0xfff) & ~0xfff;
107
108 result = lv1_unmap_device_dma_region(bus_id, dev_id, real_bus_addr,
109 len);
110 if (result)
111 return result;
112
113 return lv1_free_device_dma_region(bus_id, dev_id, real_bus_addr);
114 }
115
gelic_debug_init(void)116 static void gelic_debug_init(void)
117 {
118 s64 result;
119 u64 v2;
120 u64 mac;
121 u64 vlan_id;
122
123 result = lv1_open_device(GELIC_BUS_ID, GELIC_DEVICE_ID, 0);
124 if (result)
125 lv1_panic(0);
126
127 map_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID, &dbg, sizeof(dbg),
128 &bus_addr);
129
130 memset(&dbg, 0, sizeof(dbg));
131
132 dbg.descr.buf_addr = bus_addr + offsetof(struct debug_block, pkt);
133
134 wmb();
135
136 result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
137 GELIC_LV1_GET_MAC_ADDRESS, 0, 0, 0,
138 &mac, &v2);
139 if (result)
140 lv1_panic(0);
141
142 mac <<= 16;
143
144 h_eth = (struct ethhdr *)dbg.pkt;
145
146 eth_broadcast_addr(h_eth->h_dest);
147 memcpy(&h_eth->h_source, &mac, ETH_ALEN);
148
149 header_size = sizeof(struct ethhdr);
150
151 result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
152 GELIC_LV1_GET_VLAN_ID,
153 GELIC_LV1_VLAN_TX_ETHERNET_0, 0, 0,
154 &vlan_id, &v2);
155 if (!result) {
156 h_eth->h_proto= ETH_P_8021Q;
157
158 header_size += sizeof(struct vlan_hdr);
159 h_vlan = (struct vlan_hdr *)(h_eth + 1);
160 h_vlan->h_vlan_TCI = vlan_id;
161 h_vlan->h_vlan_encapsulated_proto = ETH_P_IP;
162 h_ip = (struct iphdr *)(h_vlan + 1);
163 } else {
164 h_eth->h_proto= 0x0800;
165 h_ip = (struct iphdr *)(h_eth + 1);
166 }
167
168 header_size += sizeof(struct iphdr);
169 h_ip->version = 4;
170 h_ip->ihl = 5;
171 h_ip->ttl = 10;
172 h_ip->protocol = 0x11;
173 h_ip->saddr = 0x00000000;
174 h_ip->daddr = 0xffffffff;
175
176 header_size += sizeof(struct udphdr);
177 h_udp = (struct udphdr *)(h_ip + 1);
178 h_udp->source = GELIC_DEBUG_PORT;
179 h_udp->dest = GELIC_DEBUG_PORT;
180
181 pmsgc = pmsg = (char *)(h_udp + 1);
182 }
183
gelic_debug_shutdown(void)184 static void gelic_debug_shutdown(void)
185 {
186 if (bus_addr)
187 unmap_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID,
188 bus_addr, sizeof(dbg));
189 lv1_close_device(GELIC_BUS_ID, GELIC_DEVICE_ID);
190 }
191
gelic_sendbuf(int msgsize)192 static void gelic_sendbuf(int msgsize)
193 {
194 u16 *p;
195 u32 sum;
196 int i;
197
198 dbg.descr.buf_size = header_size + msgsize;
199 h_ip->tot_len = msgsize + sizeof(struct udphdr) +
200 sizeof(struct iphdr);
201 h_udp->len = msgsize + sizeof(struct udphdr);
202
203 h_ip->check = 0;
204 sum = 0;
205 p = (u16 *)h_ip;
206 for (i = 0; i < 5; i++)
207 sum += *p++;
208 h_ip->check = ~(sum + (sum >> 16));
209
210 dbg.descr.dmac_cmd_status = GELIC_DESCR_DMA_CMD_NO_CHKSUM |
211 GELIC_DESCR_TX_DMA_FRAME_TAIL;
212 dbg.descr.result_size = 0;
213 dbg.descr.data_status = 0;
214
215 wmb();
216
217 lv1_net_start_tx_dma(GELIC_BUS_ID, GELIC_DEVICE_ID, bus_addr, 0);
218
219 while ((dbg.descr.dmac_cmd_status & GELIC_DESCR_DMA_STAT_MASK) ==
220 GELIC_DESCR_DMA_CARDOWNED)
221 cpu_relax();
222 }
223
ps3gelic_udbg_putc(char ch)224 static void ps3gelic_udbg_putc(char ch)
225 {
226 *pmsgc++ = ch;
227 if (ch == '\n' || (pmsgc-pmsg) >= GELIC_MAX_MESSAGE_SIZE) {
228 gelic_sendbuf(pmsgc-pmsg);
229 pmsgc = pmsg;
230 }
231 }
232
udbg_init_ps3gelic(void)233 void __init udbg_init_ps3gelic(void)
234 {
235 gelic_debug_init();
236 udbg_putc = ps3gelic_udbg_putc;
237 }
238
udbg_shutdown_ps3gelic(void)239 void udbg_shutdown_ps3gelic(void)
240 {
241 udbg_putc = NULL;
242 gelic_debug_shutdown();
243 }
244 EXPORT_SYMBOL(udbg_shutdown_ps3gelic);
245