diff options
Diffstat (limited to 'board/gdsys/common/mclink.c')
-rw-r--r-- | board/gdsys/common/mclink.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/board/gdsys/common/mclink.c b/board/gdsys/common/mclink.c deleted file mode 100644 index 6147fbf..0000000 --- a/board/gdsys/common/mclink.c +++ /dev/null @@ -1,141 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * (C) Copyright 2012 - * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc - */ - -#ifdef CONFIG_GDSYS_LEGACY_DRIVERS - -#include <common.h> -#include <asm/io.h> -#include <errno.h> - -#include <gdsys_fpga.h> -#include <linux/delay.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; -} - -#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */ |