]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/net/xilinx_ll_temac_fifo.c
2 * Xilinx xps_ll_temac ethernet driver for u-boot
6 * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net>
7 * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu>
8 * Copyright (C) 2008 - 2011 PetaLogix
10 * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver
11 * Copyright (C) 2008 Nissin Systems Co.,Ltd.
14 * CREDITS: tsec driver
16 * SPDX-License-Identifier: GPL-2.0+
18 * [0]: http://www.xilinx.com/support/documentation
20 * [F]: [0]/ip_documentation/xps_ll_fifo.pdf
21 * [S]: [0]/ip_documentation/xps_ll_temac.pdf
22 * [A]: [0]/application_notes/xapp1041.pdf
29 #include <asm/types.h>
32 #include "xilinx_ll_temac.h"
33 #include "xilinx_ll_temac_fifo.h"
35 int ll_temac_reset_fifo(struct eth_device
*dev
)
37 struct ll_temac
*ll_temac
= dev
->priv
;
38 struct fifo_ctrl
*fifo_ctrl
= (void *)ll_temac
->ctrladdr
;
40 out_be32(&fifo_ctrl
->tdfr
, LL_FIFO_TDFR_KEY
);
41 out_be32(&fifo_ctrl
->rdfr
, LL_FIFO_RDFR_KEY
);
42 out_be32(&fifo_ctrl
->isr
, ~0UL);
43 out_be32(&fifo_ctrl
->ier
, 0);
48 int ll_temac_recv_fifo(struct eth_device
*dev
)
51 u32
*buf
= (u32
*)net_rx_packets
[0];
52 struct ll_temac
*ll_temac
= dev
->priv
;
53 struct fifo_ctrl
*fifo_ctrl
= (void *)ll_temac
->ctrladdr
;
55 if (in_be32(&fifo_ctrl
->isr
) & LL_FIFO_ISR_RC
) {
58 out_be32(&fifo_ctrl
->isr
, ~0UL);
62 * while (fifo_ctrl->isr);
66 * The length is written (into RLR) by the XPS LL FIFO
67 * when the packet is received across the RX LocalLink
68 * interface and the receive data FIFO had enough
69 * locations that all of the packet data has been saved.
70 * The RLR should only be read when a receive packet is
71 * available for processing (the receive occupancy is
72 * not zero). Once the RLR is read, the receive packet
73 * data should be read from the receive data FIFO before
74 * the RLR is read again.
76 * [F] page 17, Receive Length Register (RLR)
78 if (in_be32(&fifo_ctrl
->rdfo
) & LL_FIFO_RDFO_MASK
) {
79 length
= in_be32(&fifo_ctrl
->rlf
) & LL_FIFO_RLF_MASK
;
81 printf("%s: Got error, no receive occupancy\n",
86 if (length
> PKTSIZE_ALIGN
) {
87 printf("%s: Got error, receive package too big (%i)\n",
89 ll_temac_reset_fifo(dev
);
93 for (i
= 0; i
< length
; i
+= 4)
94 *buf
++ = in_be32(&fifo_ctrl
->rdfd
);
96 net_process_received_packet(net_rx_packets
[0], length
);
102 int ll_temac_send_fifo(struct eth_device
*dev
, void *packet
, int length
)
105 u32
*buf
= (u32
*)packet
;
106 struct ll_temac
*ll_temac
= dev
->priv
;
107 struct fifo_ctrl
*fifo_ctrl
= (void *)ll_temac
->ctrladdr
;
109 if (length
< LL_FIFO_TLF_MIN
) {
110 printf("%s: Got error, transmit package too small (%i)\n",
115 if (length
> LL_FIFO_TLF_MAX
) {
116 printf("%s: Got error, transmit package too big (%i)\n",
121 for (i
= 0; i
< length
; i
+= 4)
122 out_be32(&fifo_ctrl
->tdfd
, *buf
++);
125 * Once the packet length is written to the TLR it is
126 * automatically moved to the transmit data FIFO with
127 * the packet data freeing up the TLR for another value.
128 * The packet length must be written to the TLR after
129 * the packet data is written to the transmit data FIFO.
130 * It is not valid to write data for multiple packets
131 * to the transmit data FIFO before writing the packet
134 * [F] page 17, Transmit Length Register (TLR)
136 out_be32(&fifo_ctrl
->tlf
, length
);