linux/arch/powerpc/platforms/ps3/gelic_udbg.c
Hector Martin c26afe9e85 powerpc/ps3: Add gelic udbg driver
Add a new udbg driver for the PS3 gelic Ehthernet device.

This driver shares only a few stucture and constant definitions with the
gelic Ethernet device driver, so is implemented as a stand-alone driver
with no dependencies on the gelic Ethernet device driver.

Signed-off-by: Hector Martin <hector@marcansoft.com>
Signed-off-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-09-20 09:20:05 +10:00

274 lines
5.9 KiB
C

/*
* udbg debug output routine via GELIC UDP broadcasts
*
* Copyright (C) 2007 Sony Computer Entertainment Inc.
* Copyright 2006, 2007 Sony Corporation
* Copyright (C) 2010 Hector Martin <hector@marcansoft.com>
* Copyright (C) 2011 Andre Heider <a.heider@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
*/
#include <asm/io.h>
#include <asm/udbg.h>
#include <asm/lv1call.h>
#define GELIC_BUS_ID 1
#define GELIC_DEVICE_ID 0
#define GELIC_DEBUG_PORT 18194
#define GELIC_MAX_MESSAGE_SIZE 1000
#define GELIC_LV1_GET_MAC_ADDRESS 1
#define GELIC_LV1_GET_VLAN_ID 4
#define GELIC_LV1_VLAN_TX_ETHERNET_0 2
#define GELIC_DESCR_DMA_STAT_MASK 0xf0000000
#define GELIC_DESCR_DMA_CARDOWNED 0xa0000000
#define GELIC_DESCR_TX_DMA_IKE 0x00080000
#define GELIC_DESCR_TX_DMA_NO_CHKSUM 0x00000000
#define GELIC_DESCR_TX_DMA_FRAME_TAIL 0x00040000
#define GELIC_DESCR_DMA_CMD_NO_CHKSUM (GELIC_DESCR_DMA_CARDOWNED | \
GELIC_DESCR_TX_DMA_IKE | \
GELIC_DESCR_TX_DMA_NO_CHKSUM)
static u64 bus_addr;
struct gelic_descr {
/* as defined by the hardware */
__be32 buf_addr;
__be32 buf_size;
__be32 next_descr_addr;
__be32 dmac_cmd_status;
__be32 result_size;
__be32 valid_size; /* all zeroes for tx */
__be32 data_status;
__be32 data_error; /* all zeroes for tx */
} __attribute__((aligned(32)));
struct debug_block {
struct gelic_descr descr;
u8 pkt[1520];
} __packed;
struct ethhdr {
u8 dest[6];
u8 src[6];
u16 type;
} __packed;
struct vlantag {
u16 vlan;
u16 subtype;
} __packed;
struct iphdr {
u8 ver_len;
u8 dscp_ecn;
u16 total_length;
u16 ident;
u16 frag_off_flags;
u8 ttl;
u8 proto;
u16 checksum;
u32 src;
u32 dest;
} __packed;
struct udphdr {
u16 src;
u16 dest;
u16 len;
u16 checksum;
} __packed;
static __iomem struct ethhdr *h_eth;
static __iomem struct vlantag *h_vlan;
static __iomem struct iphdr *h_ip;
static __iomem struct udphdr *h_udp;
static __iomem char *pmsg;
static __iomem char *pmsgc;
static __iomem struct debug_block dbg __attribute__((aligned(32)));
static int header_size;
static void map_dma_mem(int bus_id, int dev_id, void *start, size_t len,
u64 *real_bus_addr)
{
s64 result;
u64 real_addr = ((u64)start) & 0x0fffffffffffffffUL;
u64 real_end = real_addr + len;
u64 map_start = real_addr & ~0xfff;
u64 map_end = (real_end + 0xfff) & ~0xfff;
u64 bus_addr = 0;
u64 flags = 0xf800000000000000UL;
result = lv1_allocate_device_dma_region(bus_id, dev_id,
map_end - map_start, 12, 0,
&bus_addr);
if (result)
lv1_panic(0);
result = lv1_map_device_dma_region(bus_id, dev_id, map_start,
bus_addr, map_end - map_start,
flags);
if (result)
lv1_panic(0);
*real_bus_addr = bus_addr + real_addr - map_start;
}
static int unmap_dma_mem(int bus_id, int dev_id, u64 bus_addr, size_t len)
{
s64 result;
u64 real_bus_addr;
real_bus_addr = bus_addr & ~0xfff;
len += bus_addr - real_bus_addr;
len = (len + 0xfff) & ~0xfff;
result = lv1_unmap_device_dma_region(bus_id, dev_id, real_bus_addr,
len);
if (result)
return result;
return lv1_free_device_dma_region(bus_id, dev_id, real_bus_addr);
}
static void gelic_debug_init(void)
{
s64 result;
u64 v2;
u64 mac;
u64 vlan_id;
result = lv1_open_device(GELIC_BUS_ID, GELIC_DEVICE_ID, 0);
if (result)
lv1_panic(0);
map_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID, &dbg, sizeof(dbg),
&bus_addr);
memset(&dbg, 0, sizeof(dbg));
dbg.descr.buf_addr = bus_addr + offsetof(struct debug_block, pkt);
wmb();
result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
GELIC_LV1_GET_MAC_ADDRESS, 0, 0, 0,
&mac, &v2);
if (result)
lv1_panic(0);
mac <<= 16;
h_eth = (struct ethhdr *)dbg.pkt;
memset(&h_eth->dest, 0xff, 6);
memcpy(&h_eth->src, &mac, 6);
header_size = sizeof(struct ethhdr);
result = lv1_net_control(GELIC_BUS_ID, GELIC_DEVICE_ID,
GELIC_LV1_GET_VLAN_ID,
GELIC_LV1_VLAN_TX_ETHERNET_0, 0, 0,
&vlan_id, &v2);
if (!result) {
h_eth->type = 0x8100;
header_size += sizeof(struct vlantag);
h_vlan = (struct vlantag *)(h_eth + 1);
h_vlan->vlan = vlan_id;
h_vlan->subtype = 0x0800;
h_ip = (struct iphdr *)(h_vlan + 1);
} else {
h_eth->type = 0x0800;
h_ip = (struct iphdr *)(h_eth + 1);
}
header_size += sizeof(struct iphdr);
h_ip->ver_len = 0x45;
h_ip->ttl = 10;
h_ip->proto = 0x11;
h_ip->src = 0x00000000;
h_ip->dest = 0xffffffff;
header_size += sizeof(struct udphdr);
h_udp = (struct udphdr *)(h_ip + 1);
h_udp->src = GELIC_DEBUG_PORT;
h_udp->dest = GELIC_DEBUG_PORT;
pmsgc = pmsg = (char *)(h_udp + 1);
}
static void gelic_debug_shutdown(void)
{
if (bus_addr)
unmap_dma_mem(GELIC_BUS_ID, GELIC_DEVICE_ID,
bus_addr, sizeof(dbg));
lv1_close_device(GELIC_BUS_ID, GELIC_DEVICE_ID);
}
static void gelic_sendbuf(int msgsize)
{
u16 *p;
u32 sum;
int i;
dbg.descr.buf_size = header_size + msgsize;
h_ip->total_length = msgsize + sizeof(struct udphdr) +
sizeof(struct iphdr);
h_udp->len = msgsize + sizeof(struct udphdr);
h_ip->checksum = 0;
sum = 0;
p = (u16 *)h_ip;
for (i = 0; i < 5; i++)
sum += *p++;
h_ip->checksum = ~(sum + (sum >> 16));
dbg.descr.dmac_cmd_status = GELIC_DESCR_DMA_CMD_NO_CHKSUM |
GELIC_DESCR_TX_DMA_FRAME_TAIL;
dbg.descr.result_size = 0;
dbg.descr.data_status = 0;
wmb();
lv1_net_start_tx_dma(GELIC_BUS_ID, GELIC_DEVICE_ID, bus_addr, 0);
while ((dbg.descr.dmac_cmd_status & GELIC_DESCR_DMA_STAT_MASK) ==
GELIC_DESCR_DMA_CARDOWNED)
cpu_relax();
}
static void ps3gelic_udbg_putc(char ch)
{
*pmsgc++ = ch;
if (ch == '\n' || (pmsgc-pmsg) >= GELIC_MAX_MESSAGE_SIZE) {
gelic_sendbuf(pmsgc-pmsg);
pmsgc = pmsg;
}
}
void __init udbg_init_ps3gelic(void)
{
gelic_debug_init();
udbg_putc = ps3gelic_udbg_putc;
}
void udbg_shutdown_ps3gelic(void)
{
udbg_putc = NULL;
gelic_debug_shutdown();
}
EXPORT_SYMBOL(udbg_shutdown_ps3gelic);