| /* |
| * Bestcomm FEC tasks driver |
| * |
| * |
| * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com> |
| * Copyright (C) 2003-2004 MontaVista, Software, Inc. |
| * ( by Dale Farnsworth <dfarnsworth@mvista.com> ) |
| * |
| * This file is licensed under the terms of the GNU General Public License |
| * version 2. This program is licensed "as is" without any warranty of any |
| * kind, whether express or implied. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <asm/io.h> |
| |
| #include <linux/fsl/bestcomm/bestcomm.h> |
| #include <linux/fsl/bestcomm/bestcomm_priv.h> |
| #include <linux/fsl/bestcomm/fec.h> |
| |
| |
| /* ======================================================================== */ |
| /* Task image/var/inc */ |
| /* ======================================================================== */ |
| |
| /* fec tasks images */ |
| extern u32 bcom_fec_rx_task[]; |
| extern u32 bcom_fec_tx_task[]; |
| |
| /* rx task vars that need to be set before enabling the task */ |
| struct bcom_fec_rx_var { |
| u32 enable; /* (u16*) address of task's control register */ |
| u32 fifo; /* (u32*) address of fec's fifo */ |
| u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ |
| u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ |
| u32 bd_start; /* (struct bcom_bd*) current bd */ |
| u32 buffer_size; /* size of receive buffer */ |
| }; |
| |
| /* rx task incs that need to be set before enabling the task */ |
| struct bcom_fec_rx_inc { |
| u16 pad0; |
| s16 incr_bytes; |
| u16 pad1; |
| s16 incr_dst; |
| u16 pad2; |
| s16 incr_dst_ma; |
| }; |
| |
| /* tx task vars that need to be set before enabling the task */ |
| struct bcom_fec_tx_var { |
| u32 DRD; /* (u32*) address of self-modified DRD */ |
| u32 fifo; /* (u32*) address of fec's fifo */ |
| u32 enable; /* (u16*) address of task's control register */ |
| u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ |
| u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ |
| u32 bd_start; /* (struct bcom_bd*) current bd */ |
| u32 buffer_size; /* set by uCode for each packet */ |
| }; |
| |
| /* tx task incs that need to be set before enabling the task */ |
| struct bcom_fec_tx_inc { |
| u16 pad0; |
| s16 incr_bytes; |
| u16 pad1; |
| s16 incr_src; |
| u16 pad2; |
| s16 incr_src_ma; |
| }; |
| |
| /* private structure in the task */ |
| struct bcom_fec_priv { |
| phys_addr_t fifo; |
| int maxbufsize; |
| }; |
| |
| |
| /* ======================================================================== */ |
| /* Task support code */ |
| /* ======================================================================== */ |
| |
| struct bcom_task * |
| bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize) |
| { |
| struct bcom_task *tsk; |
| struct bcom_fec_priv *priv; |
| |
| tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd), |
| sizeof(struct bcom_fec_priv)); |
| if (!tsk) |
| return NULL; |
| |
| tsk->flags = BCOM_FLAGS_NONE; |
| |
| priv = tsk->priv; |
| priv->fifo = fifo; |
| priv->maxbufsize = maxbufsize; |
| |
| if (bcom_fec_rx_reset(tsk)) { |
| bcom_task_free(tsk); |
| return NULL; |
| } |
| |
| return tsk; |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_rx_init); |
| |
| int |
| bcom_fec_rx_reset(struct bcom_task *tsk) |
| { |
| struct bcom_fec_priv *priv = tsk->priv; |
| struct bcom_fec_rx_var *var; |
| struct bcom_fec_rx_inc *inc; |
| |
| /* Shutdown the task */ |
| bcom_disable_task(tsk->tasknum); |
| |
| /* Reset the microcode */ |
| var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum); |
| inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum); |
| |
| if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task)) |
| return -1; |
| |
| var->enable = bcom_eng->regs_base + |
| offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); |
| var->fifo = (u32) priv->fifo; |
| var->bd_base = tsk->bd_pa; |
| var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); |
| var->bd_start = tsk->bd_pa; |
| var->buffer_size = priv->maxbufsize; |
| |
| inc->incr_bytes = -(s16)sizeof(u32); /* These should be in the */ |
| inc->incr_dst = sizeof(u32); /* task image, but we stick */ |
| inc->incr_dst_ma= sizeof(u8); /* to the official ones */ |
| |
| /* Reset the BDs */ |
| tsk->index = 0; |
| tsk->outdex = 0; |
| |
| memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); |
| |
| /* Configure some stuff */ |
| bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA); |
| bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); |
| |
| out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX); |
| |
| out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_rx_reset); |
| |
| void |
| bcom_fec_rx_release(struct bcom_task *tsk) |
| { |
| /* Nothing special for the FEC tasks */ |
| bcom_task_free(tsk); |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_rx_release); |
| |
| |
| |
| /* Return 2nd to last DRD */ |
| /* This is an ugly hack, but at least it's only done |
| once at initialization */ |
| static u32 *self_modified_drd(int tasknum) |
| { |
| u32 *desc; |
| int num_descs; |
| int drd_count; |
| int i; |
| |
| num_descs = bcom_task_num_descs(tasknum); |
| desc = bcom_task_desc(tasknum) + num_descs - 1; |
| drd_count = 0; |
| for (i=0; i<num_descs; i++, desc--) |
| if (bcom_desc_is_drd(*desc) && ++drd_count == 3) |
| break; |
| return desc; |
| } |
| |
| struct bcom_task * |
| bcom_fec_tx_init(int queue_len, phys_addr_t fifo) |
| { |
| struct bcom_task *tsk; |
| struct bcom_fec_priv *priv; |
| |
| tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd), |
| sizeof(struct bcom_fec_priv)); |
| if (!tsk) |
| return NULL; |
| |
| tsk->flags = BCOM_FLAGS_ENABLE_TASK; |
| |
| priv = tsk->priv; |
| priv->fifo = fifo; |
| |
| if (bcom_fec_tx_reset(tsk)) { |
| bcom_task_free(tsk); |
| return NULL; |
| } |
| |
| return tsk; |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_tx_init); |
| |
| int |
| bcom_fec_tx_reset(struct bcom_task *tsk) |
| { |
| struct bcom_fec_priv *priv = tsk->priv; |
| struct bcom_fec_tx_var *var; |
| struct bcom_fec_tx_inc *inc; |
| |
| /* Shutdown the task */ |
| bcom_disable_task(tsk->tasknum); |
| |
| /* Reset the microcode */ |
| var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum); |
| inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum); |
| |
| if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task)) |
| return -1; |
| |
| var->enable = bcom_eng->regs_base + |
| offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); |
| var->fifo = (u32) priv->fifo; |
| var->DRD = bcom_sram_va2pa(self_modified_drd(tsk->tasknum)); |
| var->bd_base = tsk->bd_pa; |
| var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); |
| var->bd_start = tsk->bd_pa; |
| |
| inc->incr_bytes = -(s16)sizeof(u32); /* These should be in the */ |
| inc->incr_src = sizeof(u32); /* task image, but we stick */ |
| inc->incr_src_ma= sizeof(u8); /* to the official ones */ |
| |
| /* Reset the BDs */ |
| tsk->index = 0; |
| tsk->outdex = 0; |
| |
| memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); |
| |
| /* Configure some stuff */ |
| bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA); |
| bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); |
| |
| out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX); |
| |
| out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_tx_reset); |
| |
| void |
| bcom_fec_tx_release(struct bcom_task *tsk) |
| { |
| /* Nothing special for the FEC tasks */ |
| bcom_task_free(tsk); |
| } |
| EXPORT_SYMBOL_GPL(bcom_fec_tx_release); |
| |
| |
| MODULE_DESCRIPTION("BestComm FEC tasks driver"); |
| MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>"); |
| MODULE_LICENSE("GPL v2"); |
| |