1 // SPDX-License-Identifier: GPL-2.0+
4 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
11 #include <gdsys_fpga.h>
14 MCINT_SLAVE_LINK_CHANGED_EV = 1 << 7,
15 MCINT_TX_ERROR_EV = 1 << 9,
16 MCINT_TX_BUFFER_FREE = 1 << 10,
17 MCINT_TX_PACKET_TRANSMITTED_EV = 1 << 11,
18 MCINT_RX_ERROR_EV = 1 << 13,
19 MCINT_RX_CONTENT_AVAILABLE = 1 << 14,
20 MCINT_RX_PACKET_RECEIVED_EV = 1 << 15,
23 int mclink_probe(void)
28 for (k = 0; k < CONFIG_SYS_MCLINK_MAX; ++k) {
33 FPGA_GET_REG(k, mc_status, &mc_status);
35 if (!(mc_status & (1 << 15)))
38 FPGA_SET_REG(k, mc_control, 0x8000);
40 FPGA_GET_REG(k, mc_status, &mc_status);
41 while (!(mc_status & (1 << 14))) {
47 FPGA_GET_REG(k, mc_status, &mc_status);
52 printf("waited %d us for mclink %d to come up\n", ctr * 100, k);
60 int mclink_send(u8 slave, u16 addr, u16 data)
67 /* reset interrupt status */
68 FPGA_GET_REG(0, mc_int, &int_status);
69 FPGA_SET_REG(0, mc_int, int_status);
72 FPGA_SET_REG(0, mc_tx_address, addr);
73 FPGA_SET_REG(0, mc_tx_data, data);
74 FPGA_SET_REG(0, mc_tx_cmd, (slave & 0x03) << 14);
75 FPGA_SET_REG(0, mc_control, 0x8001);
78 FPGA_GET_REG(0, mc_int, &int_status);
79 while (!(int_status & MCINT_RX_PACKET_RECEIVED_EV)) {
83 FPGA_GET_REG(0, mc_int, &int_status);
86 FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
87 rx_cmd = (rx_cmd_status >> 12) & 0x03;
89 printf("mclink_send: received cmd %d, expected %d\n", rx_cmd,
95 int mclink_receive(u8 slave, u16 addr, u16 *data)
100 unsigned int ctr = 0;
102 /* send read request */
103 FPGA_SET_REG(0, mc_tx_address, addr);
104 FPGA_SET_REG(0, mc_tx_cmd,
105 ((slave & 0x03) << 14) | (1 << 12) | (1 << 0));
106 FPGA_SET_REG(0, mc_control, 0x8001);
110 FPGA_GET_REG(0, mc_int, &int_status);
111 while (!(int_status & MCINT_RX_CONTENT_AVAILABLE)) {
115 FPGA_GET_REG(0, mc_int, &int_status);
119 FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
120 if ((rx_cmd_status >> 14) != slave) {
121 printf("mclink_receive: reply from slave %d, expected %d\n",
122 rx_cmd_status >> 14, slave);
126 rx_cmd = (rx_cmd_status >> 12) & 0x03;
128 printf("mclink_send: received cmd %d, expected %d\n",
133 FPGA_GET_REG(0, mc_rx_data, data);