3 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
5 * SPDX-License-Identifier: GPL-2.0+
12 #include <gdsys_fpga.h>
15 MCINT_SLAVE_LINK_CHANGED_EV = 1 << 7,
16 MCINT_TX_ERROR_EV = 1 << 9,
17 MCINT_TX_BUFFER_FREE = 1 << 10,
18 MCINT_TX_PACKET_TRANSMITTED_EV = 1 << 11,
19 MCINT_RX_ERROR_EV = 1 << 13,
20 MCINT_RX_CONTENT_AVAILABLE = 1 << 14,
21 MCINT_RX_PACKET_RECEIVED_EV = 1 << 15,
24 int mclink_probe(void)
29 for (k = 0; k < CONFIG_SYS_MCLINK_MAX; ++k) {
34 FPGA_GET_REG(k, mc_status, &mc_status);
36 if (!(mc_status & (1 << 15)))
39 FPGA_SET_REG(k, mc_control, 0x8000);
41 FPGA_GET_REG(k, mc_status, &mc_status);
42 while (!(mc_status & (1 << 14))) {
48 FPGA_GET_REG(k, mc_status, &mc_status);
53 printf("waited %d us for mclink %d to come up\n", ctr * 100, k);
61 int mclink_send(u8 slave, u16 addr, u16 data)
68 /* reset interrupt status */
69 FPGA_GET_REG(0, mc_int, &int_status);
70 FPGA_SET_REG(0, mc_int, int_status);
73 FPGA_SET_REG(0, mc_tx_address, addr);
74 FPGA_SET_REG(0, mc_tx_data, data);
75 FPGA_SET_REG(0, mc_tx_cmd, (slave & 0x03) << 14);
76 FPGA_SET_REG(0, mc_control, 0x8001);
79 FPGA_GET_REG(0, mc_int, &int_status);
80 while (!(int_status & MCINT_RX_PACKET_RECEIVED_EV)) {
84 FPGA_GET_REG(0, mc_int, &int_status);
87 FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
88 rx_cmd = (rx_cmd_status >> 12) & 0x03;
90 printf("mclink_send: received cmd %d, expected %d\n", rx_cmd,
96 int mclink_receive(u8 slave, u16 addr, u16 *data)
101 unsigned int ctr = 0;
103 /* send read request */
104 FPGA_SET_REG(0, mc_tx_address, addr);
105 FPGA_SET_REG(0, mc_tx_cmd,
106 ((slave & 0x03) << 14) | (1 << 12) | (1 << 0));
107 FPGA_SET_REG(0, mc_control, 0x8001);
111 FPGA_GET_REG(0, mc_int, &int_status);
112 while (!(int_status & MCINT_RX_CONTENT_AVAILABLE)) {
116 FPGA_GET_REG(0, mc_int, &int_status);
120 FPGA_GET_REG(0, mc_rx_cmd_status, &rx_cmd_status);
121 if ((rx_cmd_status >> 14) != slave) {
122 printf("mclink_receive: reply from slave %d, expected %d\n",
123 rx_cmd_status >> 14, slave);
127 rx_cmd = (rx_cmd_status >> 12) & 0x03;
129 printf("mclink_send: received cmd %d, expected %d\n",
134 FPGA_GET_REG(0, mc_rx_data, data);