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