arch/powerpc/platforms/ps3/gelic_udbg.c

   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/ps3.h>
  18 #include <asm/io.h>
  19 #include <asm/udbg.h>
  20 #include <asm/lv1call.h>
  21
  22 #define GELIC_BUS_ID 1
  23 #define GELIC_DEVICE_ID 0
  24 #define GELIC_DEBUG_PORT 18194
  25 #define GELIC_MAX_MESSAGE_SIZE 1000
  26
  27 #define GELIC_LV1_GET_MAC_ADDRESS 1
  28 #define GELIC_LV1_GET_VLAN_ID 4
  29 #define GELIC_LV1_VLAN_TX_ETHERNET_0 2
  30
  31 #define GELIC_DESCR_DMA_STAT_MASK 0xf0000000
  32 #define GELIC_DESCR_DMA_CARDOWNED 0xa0000000
  33
  34 #define GELIC_DESCR_TX_DMA_IKE 0x00080000
  35 #define GELIC_DESCR_TX_DMA_NO_CHKSUM 0x00000000
  36 #define GELIC_DESCR_TX_DMA_FRAME_TAIL 0x00040000
  37
  38 #define GELIC_DESCR_DMA_CMD_NO_CHKSUM (GELIC_DESCR_DMA_CARDOWNED | \
  39                                        GELIC_DESCR_TX_DMA_IKE | \
  40                                        GELIC_DESCR_TX_DMA_NO_CHKSUM)
  41
  42 static u64 bus_addr;
  43
  44 struct gelic_descr {
  45         /* as defined by the hardware */
  46         __be32 buf_addr;
  47         __be32 buf_size;
  48         __be32 next_descr_addr;
  49         __be32 dmac_cmd_status;
  50         __be32 result_size;
  51         __be32 valid_size;      /* all zeroes for tx */
  52         __be32 data_status;
  53         __be32 data_error;      /* all zeroes for tx */
  54 } __attribute__((aligned(32)));
  55
  56 struct debug_block {
  57         struct gelic_descr descr;
  58         u8 pkt[1520];
  59 } __packed;
  60
  61 static __iomem struct ethhdr *h_eth;
  62 static __iomem struct vlan_hdr *h_vlan;
  63 static __iomem struct iphdr *h_ip;
  64 static __iomem struct udphdr *h_udp;
  65
  66 static __iomem char *pmsg;
  67 static __iomem char *pmsgc;
  68
  69 static __iomem struct debug_block dbg __attribute__((aligned(32)));
  70
  71 static int header_size;
  72
  73 static void map_dma_mem(int bus_id, int dev_id, void *start, size_t len,
  74                         u64 *real_bus_addr)
  75 {
  76         s64 result;
  77         u64 real_addr = ((u64)start) & 0x0fffffffffffffffUL;
  78         u64 real_end = real_addr + len;
  79         u64 map_start = real_addr & ~0xfff;
  80         u64 map_end = (real_end + 0xfff) & ~0xfff;
  81         u64 bus_addr = 0;
  82
  83         u64 flags = 0xf800000000000000UL;
  84
  85         result = lv1_allocate_device_dma_region(bus_id, dev_id,
  86                                                 map_end - map_start, 12, 0,
  87                                                 &bus_addr);
  88         if (result)
  89                 lv1_panic(0);
  90
  91         result = lv1_map_device_dma_region(bus_id, dev_id, map_start,
  92                                            bus_addr, map_end - map_start,
  93                                            flags);
  94         if (result)
  95                 lv1_panic(0);
  96
  97         *real_bus_addr = bus_addr + real_addr - map_start;
  98 }
  99
 100 static int unmap_dma_mem(int bus_id, int dev_id, u64 bus_addr, size_t len)
 101 {
 102         s64 result;
 103         u64 real_bus_addr;
 104
 105         real_bus_addr = bus_addr & ~0xfff;
 106         len += bus_addr - real_bus_addr;
 107         len = (len + 0xfff) & ~0xfff;
 108
 109         result = lv1_unmap_device_dma_region(bus_id, dev_id, real_bus_addr,
 110                                              len);
 111         if (result)
 112                 return result;
 113
 114         return lv1_free_device_dma_region(bus_id, dev_id, real_bus_addr);
 115 }
 116
 117 static void __init gelic_debug_init(void)
 118 {
 119         s64 result;
 120         u64 v2;
 121         u64 mac;
 122         u64 vlan_id;
 123
 124         result = lv1_open_device(GELIC_BUS_ID, GELIC_DEVICE_ID, 0);
 125         if (result)
 126                 lv1_panic(0);
 127
 128         map_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID, &dbg, sizeof(dbg),
 129                     &bus_addr);
 130
 131         memset(&dbg, 0, sizeof(dbg));
 132
 133         dbg.descr.buf_addr = bus_addr + offsetof(struct debug_block, pkt);
 134
 135         wmb();
 136
 137         result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
 138                                  GELIC_LV1_GET_MAC_ADDRESS, 0, 0, 0,
 139                                  &mac, &v2);
 140         if (result)
 141                 lv1_panic(0);
 142
 143         mac <<= 16;
 144
 145         h_eth = (struct ethhdr *)dbg.pkt;
 146
 147         eth_broadcast_addr(h_eth->h_dest);
 148         memcpy(&h_eth->h_source, &mac, ETH_ALEN);
 149
 150         header_size = sizeof(struct ethhdr);
 151
 152         result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
 153                                  GELIC_LV1_GET_VLAN_ID,
 154                                  GELIC_LV1_VLAN_TX_ETHERNET_0, 0, 0,
 155                                  &vlan_id, &v2);
 156         if (!result) {
 157                 h_eth->h_proto= ETH_P_8021Q;
 158
 159                 header_size += sizeof(struct vlan_hdr);
 160                 h_vlan = (struct vlan_hdr *)(h_eth + 1);
 161                 h_vlan->h_vlan_TCI = vlan_id;
 162                 h_vlan->h_vlan_encapsulated_proto = ETH_P_IP;
 163                 h_ip = (struct iphdr *)(h_vlan + 1);
 164         } else {
 165                 h_eth->h_proto= 0x0800;
 166                 h_ip = (struct iphdr *)(h_eth + 1);
 167         }
 168
 169         header_size += sizeof(struct iphdr);
 170         h_ip->version = 4;
 171         h_ip->ihl = 5;
 172         h_ip->ttl = 10;
 173         h_ip->protocol = 0x11;
 174         h_ip->saddr = 0x00000000;
 175         h_ip->daddr = 0xffffffff;
 176
 177         header_size += sizeof(struct udphdr);
 178         h_udp = (struct udphdr *)(h_ip + 1);
 179         h_udp->source = GELIC_DEBUG_PORT;
 180         h_udp->dest = GELIC_DEBUG_PORT;
 181
 182         pmsgc = pmsg = (char *)(h_udp + 1);
 183 }
 184
 185 static void gelic_debug_shutdown(void)
 186 {
 187         if (bus_addr)
 188                 unmap_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID,
 189                               bus_addr, sizeof(dbg));
 190         lv1_close_device(GELIC_BUS_ID, GELIC_DEVICE_ID);
 191 }
 192
 193 static void gelic_sendbuf(int msgsize)
 194 {
 195         u16 *p;
 196         u32 sum;
 197         int i;
 198
 199         dbg.descr.buf_size = header_size + msgsize;
 200         h_ip->tot_len = msgsize + sizeof(struct udphdr) +
 201                              sizeof(struct iphdr);
 202         h_udp->len = msgsize + sizeof(struct udphdr);
 203
 204         h_ip->check = 0;
 205         sum = 0;
 206         p = (u16 *)h_ip;
 207         for (i = 0; i < 5; i++)
 208                 sum += *p++;
 209         h_ip->check = ~(sum + (sum >> 16));
 210
 211         dbg.descr.dmac_cmd_status = GELIC_DESCR_DMA_CMD_NO_CHKSUM |
 212                                     GELIC_DESCR_TX_DMA_FRAME_TAIL;
 213         dbg.descr.result_size = 0;
 214         dbg.descr.data_status = 0;
 215
 216         wmb();
 217
 218         lv1_net_start_tx_dma(GELIC_BUS_ID, GELIC_DEVICE_ID, bus_addr, 0);
 219
 220         while ((dbg.descr.dmac_cmd_status & GELIC_DESCR_DMA_STAT_MASK) ==
 221                GELIC_DESCR_DMA_CARDOWNED)
 222                 cpu_relax();
 223 }
 224
 225 static void ps3gelic_udbg_putc(char ch)
 226 {
 227         *pmsgc++ = ch;
 228         if (ch == '\n' || (pmsgc-pmsg) >= GELIC_MAX_MESSAGE_SIZE) {
 229                 gelic_sendbuf(pmsgc-pmsg);
 230                 pmsgc = pmsg;
 231         }
 232 }
 233
 234 void __init udbg_init_ps3gelic(void)
 235 {
 236         gelic_debug_init();
 237         udbg_putc = ps3gelic_udbg_putc;
 238 }
 239
 240 void udbg_shutdown_ps3gelic(void)
 241 {
 242         udbg_putc = NULL;
 243         gelic_debug_shutdown();
 244 }
 245 EXPORT_SYMBOL(udbg_shutdown_ps3gelic);