u-boot/board/gdsys/common/mclink.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

136 lines
2.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012
* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
*/
#include <common.h>
#include <asm/io.h>
#include <errno.h>
#include <gdsys_fpga.h>
enum {
MCINT_SLAVE_LINK_CHANGED_EV = 1 << 7,
MCINT_TX_ERROR_EV = 1 << 9,
MCINT_TX_BUFFER_FREE = 1 << 10,
MCINT_TX_PACKET_TRANSMITTED_EV = 1 << 11,
MCINT_RX_ERROR_EV = 1 << 13,
MCINT_RX_CONTENT_AVAILABLE = 1 << 14,
MCINT_RX_PACKET_RECEIVED_EV = 1 << 15,
};
int mclink_probe(void)
{
unsigned int k;
int slaves = 0;
for (k = 0; k < CONFIG_SYS_MCLINK_MAX; ++k) {
int timeout = 0;
unsigned int ctr = 0;
u16 mc_status;
FPGA_GET_REG(k, mc_status, &mc_status);
if (!(mc_status & (1 << 15)))
break;
FPGA_SET_REG(k, mc_control, 0x8000);
FPGA_GET_REG(k, mc_status, &mc_status);
while (!(mc_status & (1 << 14))) {
udelay(100);
if (ctr++ > 500) {
timeout = 1;
break;
}
FPGA_GET_REG(k, mc_status, &mc_status);
}
if (timeout)
break;
printf("waited %d us for mclink %d to come up\n", ctr * 100, k);
slaves++;
}
return slaves;
}
int mclink_send(u8 slave, u16 addr, u16 data)
{
unsigned int ctr = 0;
u16 int_status;
u16 rx_cmd_status;
u16 rx_cmd;
/* reset interrupt status */
FPGA_GET_REG(0, mc_int, &int_status);
FPGA_SET_REG(0, mc_int, int_status);
/* send */
FPGA_SET_REG(0, mc_tx_address, addr);
FPGA_SET_REG(0, mc_tx_data, data);
FPGA_SET_REG(0, mc_tx_cmd, (slave & 0x03) << 14);
FPGA_SET_REG(0, mc_control, 0x8001);
/* wait for reply */
FPGA_GET_REG(0, mc_int, &int_status);
while (!(int_status & MCINT_RX_PACKET_RECEIVED_EV)) {
udelay(100);
if (ctr++ > 3)
return -ETIMEDOUT;
FPGA_GET_REG(0, mc_int, &int_status);
}
FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
rx_cmd = (rx_cmd_status >> 12) & 0x03;
if (rx_cmd != 0)
printf("mclink_send: received cmd %d, expected %d\n", rx_cmd,
0);
return 0;
}
int mclink_receive(u8 slave, u16 addr, u16 *data)
{
u16 rx_cmd_status;
u16 rx_cmd;
u16 int_status;
unsigned int ctr = 0;
/* send read request */
FPGA_SET_REG(0, mc_tx_address, addr);
FPGA_SET_REG(0, mc_tx_cmd,
((slave & 0x03) << 14) | (1 << 12) | (1 << 0));
FPGA_SET_REG(0, mc_control, 0x8001);
/* wait for reply */
FPGA_GET_REG(0, mc_int, &int_status);
while (!(int_status & MCINT_RX_CONTENT_AVAILABLE)) {
udelay(100);
if (ctr++ > 3)
return -ETIMEDOUT;
FPGA_GET_REG(0, mc_int, &int_status);
}
/* check reply */
FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
if ((rx_cmd_status >> 14) != slave) {
printf("mclink_receive: reply from slave %d, expected %d\n",
rx_cmd_status >> 14, slave);
return -EINVAL;
}
rx_cmd = (rx_cmd_status >> 12) & 0x03;
if (rx_cmd != 1) {
printf("mclink_send: received cmd %d, expected %d\n",
rx_cmd, 1);
return -EIO;
}
FPGA_GET_REG(0, mc_rx_data, data);
return 0;
}