diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/dma/bestcomm/fec.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/dma/bestcomm/fec.c b/drivers/dma/bestcomm/fec.c new file mode 100644 index 000000000..3a4a2f791 --- /dev/null +++ b/drivers/dma/bestcomm/fec.c @@ -0,0 +1,265 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> ) + */ + +#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"); |