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350 lines
9.2 KiB
350 lines
9.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for MPC52xx processor BestComm General Buffer Descriptor |
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* |
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* Copyright (C) 2007 Sylvain Munaut <[email protected]> |
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* Copyright (C) 2006 AppSpec Computer Technologies Corp. |
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* Jeff Gibbons <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <asm/errno.h> |
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#include <asm/io.h> |
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#include <asm/mpc52xx.h> |
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#include <asm/mpc52xx_psc.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/gen_bd.h> |
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/* ======================================================================== */ |
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/* Task image/var/inc */ |
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/* ======================================================================== */ |
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/* gen_bd tasks images */ |
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extern u32 bcom_gen_bd_rx_task[]; |
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extern u32 bcom_gen_bd_tx_task[]; |
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/* rx task vars that need to be set before enabling the task */ |
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struct bcom_gen_bd_rx_var { |
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u32 enable; /* (u16*) address of task's control register */ |
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u32 fifo; /* (u32*) address of gen_bd'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_gen_bd_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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}; |
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/* tx task vars that need to be set before enabling the task */ |
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struct bcom_gen_bd_tx_var { |
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u32 fifo; /* (u32*) address of gen_bd'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_gen_bd_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 */ |
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struct bcom_gen_bd_priv { |
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phys_addr_t fifo; |
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int initiator; |
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int ipr; |
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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_gen_bd_rx_init(int queue_len, phys_addr_t fifo, |
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int initiator, int ipr, int maxbufsize) |
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{ |
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struct bcom_task *tsk; |
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struct bcom_gen_bd_priv *priv; |
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tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), |
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sizeof(struct bcom_gen_bd_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->initiator = initiator; |
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priv->ipr = ipr; |
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priv->maxbufsize = maxbufsize; |
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if (bcom_gen_bd_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_gen_bd_rx_init); |
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int |
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bcom_gen_bd_rx_reset(struct bcom_task *tsk) |
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{ |
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struct bcom_gen_bd_priv *priv = tsk->priv; |
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struct bcom_gen_bd_rx_var *var; |
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struct bcom_gen_bd_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_gen_bd_rx_var *) bcom_task_var(tsk->tasknum); |
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inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum); |
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if (bcom_load_image(tsk->tasknum, bcom_gen_bd_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); |
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inc->incr_dst = sizeof(u32); |
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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_GEN_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[priv->initiator], priv->ipr); |
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bcom_set_initiator(tsk->tasknum, priv->initiator); |
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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_gen_bd_rx_reset); |
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void |
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bcom_gen_bd_rx_release(struct bcom_task *tsk) |
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{ |
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/* Nothing special for the GenBD tasks */ |
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bcom_task_free(tsk); |
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} |
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EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release); |
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extern struct bcom_task * |
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bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo, |
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int initiator, int ipr) |
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{ |
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struct bcom_task *tsk; |
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struct bcom_gen_bd_priv *priv; |
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tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), |
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sizeof(struct bcom_gen_bd_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->initiator = initiator; |
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priv->ipr = ipr; |
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if (bcom_gen_bd_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_gen_bd_tx_init); |
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int |
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bcom_gen_bd_tx_reset(struct bcom_task *tsk) |
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{ |
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struct bcom_gen_bd_priv *priv = tsk->priv; |
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struct bcom_gen_bd_tx_var *var; |
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struct bcom_gen_bd_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_gen_bd_tx_var *) bcom_task_var(tsk->tasknum); |
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inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum); |
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if (bcom_load_image(tsk->tasknum, bcom_gen_bd_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->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); |
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inc->incr_src = sizeof(u32); |
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inc->incr_src_ma = sizeof(u8); |
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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_GEN_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[priv->initiator], priv->ipr); |
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bcom_set_initiator(tsk->tasknum, priv->initiator); |
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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_gen_bd_tx_reset); |
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void |
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bcom_gen_bd_tx_release(struct bcom_task *tsk) |
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{ |
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/* Nothing special for the GenBD tasks */ |
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bcom_task_free(tsk); |
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} |
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EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release); |
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/* --------------------------------------------------------------------- |
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* PSC support code |
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*/ |
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/** |
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* bcom_psc_parameters - Bestcomm initialization value table for PSC devices |
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* |
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* This structure is only used internally. It is a lookup table for PSC |
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* specific parameters to bestcomm tasks. |
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*/ |
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static struct bcom_psc_params { |
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int rx_initiator; |
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int rx_ipr; |
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int tx_initiator; |
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int tx_ipr; |
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} bcom_psc_params[] = { |
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[0] = { |
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.rx_initiator = BCOM_INITIATOR_PSC1_RX, |
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.rx_ipr = BCOM_IPR_PSC1_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC1_TX, |
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.tx_ipr = BCOM_IPR_PSC1_TX, |
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}, |
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[1] = { |
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.rx_initiator = BCOM_INITIATOR_PSC2_RX, |
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.rx_ipr = BCOM_IPR_PSC2_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC2_TX, |
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.tx_ipr = BCOM_IPR_PSC2_TX, |
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}, |
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[2] = { |
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.rx_initiator = BCOM_INITIATOR_PSC3_RX, |
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.rx_ipr = BCOM_IPR_PSC3_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC3_TX, |
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.tx_ipr = BCOM_IPR_PSC3_TX, |
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}, |
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[3] = { |
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.rx_initiator = BCOM_INITIATOR_PSC4_RX, |
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.rx_ipr = BCOM_IPR_PSC4_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC4_TX, |
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.tx_ipr = BCOM_IPR_PSC4_TX, |
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}, |
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[4] = { |
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.rx_initiator = BCOM_INITIATOR_PSC5_RX, |
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.rx_ipr = BCOM_IPR_PSC5_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC5_TX, |
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.tx_ipr = BCOM_IPR_PSC5_TX, |
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}, |
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[5] = { |
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.rx_initiator = BCOM_INITIATOR_PSC6_RX, |
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.rx_ipr = BCOM_IPR_PSC6_RX, |
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.tx_initiator = BCOM_INITIATOR_PSC6_TX, |
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.tx_ipr = BCOM_IPR_PSC6_TX, |
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}, |
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}; |
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/** |
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* bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port |
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* @psc_num: Number of the PSC to allocate a task for |
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* @queue_len: number of buffer descriptors to allocate for the task |
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* @fifo: physical address of FIFO register |
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* @maxbufsize: Maximum receive data size in bytes. |
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* |
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* Allocate a bestcomm task structure for receiving data from a PSC. |
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*/ |
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struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len, |
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phys_addr_t fifo, int maxbufsize) |
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{ |
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if (psc_num >= MPC52xx_PSC_MAXNUM) |
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return NULL; |
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return bcom_gen_bd_rx_init(queue_len, fifo, |
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bcom_psc_params[psc_num].rx_initiator, |
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bcom_psc_params[psc_num].rx_ipr, |
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maxbufsize); |
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} |
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EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init); |
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/** |
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* bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port |
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* @psc_num: Number of the PSC to allocate a task for |
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* @queue_len: number of buffer descriptors to allocate for the task |
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* @fifo: physical address of FIFO register |
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* |
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* Allocate a bestcomm task structure for transmitting data to a PSC. |
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*/ |
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struct bcom_task * |
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bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo) |
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{ |
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struct psc; |
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return bcom_gen_bd_tx_init(queue_len, fifo, |
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bcom_psc_params[psc_num].tx_initiator, |
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bcom_psc_params[psc_num].tx_ipr); |
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} |
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EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init); |
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MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver"); |
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MODULE_AUTHOR("Jeff Gibbons <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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