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/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
  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
  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
 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
 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
 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
 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
 233 void __init udbg_init_ps3gelic(void)
 234 {
 235         gelic_debug_init();
 236         udbg_putc = ps3gelic_udbg_putc;
 237 }
 238
 239 void udbg_shutdown_ps3gelic(void)
 240 {
 241         udbg_putc = NULL;
 242         gelic_debug_shutdown();
 243 }
 244 EXPORT_SYMBOL(udbg_shutdown_ps3gelic);