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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [powerpc/] [sysdev/] [bestcomm/] [gen_bd.c] - Rev 3
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/* * Driver for MPC52xx processor BestComm General Buffer Descriptor * * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com> * Copyright (C) 2006 AppSpec Computer Technologies Corp. * Jeff Gibbons <jeff.gibbons@appspec.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * */ #include <linux/version.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/types.h> #include <asm/errno.h> #include <asm/io.h> #include <asm/mpc52xx.h> #include "bestcomm.h" #include "bestcomm_priv.h" #include "gen_bd.h" /* ======================================================================== */ /* Task image/var/inc */ /* ======================================================================== */ /* gen_bd tasks images */ extern u32 bcom_gen_bd_rx_task[]; extern u32 bcom_gen_bd_tx_task[]; /* rx task vars that need to be set before enabling the task */ struct bcom_gen_bd_rx_var { u32 enable; /* (u16*) address of task's control register */ u32 fifo; /* (u32*) address of gen_bd'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_gen_bd_rx_inc { u16 pad0; s16 incr_bytes; u16 pad1; s16 incr_dst; }; /* tx task vars that need to be set before enabling the task */ struct bcom_gen_bd_tx_var { u32 fifo; /* (u32*) address of gen_bd'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_gen_bd_tx_inc { u16 pad0; s16 incr_bytes; u16 pad1; s16 incr_src; u16 pad2; s16 incr_src_ma; }; /* private structure */ struct bcom_gen_bd_priv { phys_addr_t fifo; int initiator; int ipr; int maxbufsize; }; /* ======================================================================== */ /* Task support code */ /* ======================================================================== */ struct bcom_task * bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo, int initiator, int ipr, int maxbufsize) { struct bcom_task *tsk; struct bcom_gen_bd_priv *priv; tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), sizeof(struct bcom_gen_bd_priv)); if (!tsk) return NULL; tsk->flags = BCOM_FLAGS_NONE; priv = tsk->priv; priv->fifo = fifo; priv->initiator = initiator; priv->ipr = ipr; priv->maxbufsize = maxbufsize; if (bcom_gen_bd_rx_reset(tsk)) { bcom_task_free(tsk); return NULL; } return tsk; } EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init); int bcom_gen_bd_rx_reset(struct bcom_task *tsk) { struct bcom_gen_bd_priv *priv = tsk->priv; struct bcom_gen_bd_rx_var *var; struct bcom_gen_bd_rx_inc *inc; /* Shutdown the task */ bcom_disable_task(tsk->tasknum); /* Reset the microcode */ var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum); inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum); if (bcom_load_image(tsk->tasknum, bcom_gen_bd_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); inc->incr_dst = sizeof(u32); /* Reset the BDs */ tsk->index = 0; tsk->outdex = 0; memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); /* Configure some stuff */ bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA); bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); bcom_set_initiator(tsk->tasknum, priv->initiator); out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ return 0; } EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset); void bcom_gen_bd_rx_release(struct bcom_task *tsk) { /* Nothing special for the GenBD tasks */ bcom_task_free(tsk); } EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release); extern struct bcom_task * bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo, int initiator, int ipr) { struct bcom_task *tsk; struct bcom_gen_bd_priv *priv; tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), sizeof(struct bcom_gen_bd_priv)); if (!tsk) return NULL; tsk->flags = BCOM_FLAGS_NONE; priv = tsk->priv; priv->fifo = fifo; priv->initiator = initiator; priv->ipr = ipr; if (bcom_gen_bd_tx_reset(tsk)) { bcom_task_free(tsk); return NULL; } return tsk; } EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init); int bcom_gen_bd_tx_reset(struct bcom_task *tsk) { struct bcom_gen_bd_priv *priv = tsk->priv; struct bcom_gen_bd_tx_var *var; struct bcom_gen_bd_tx_inc *inc; /* Shutdown the task */ bcom_disable_task(tsk->tasknum); /* Reset the microcode */ var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum); inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum); if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_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; inc->incr_bytes = -(s16)sizeof(u32); inc->incr_src = sizeof(u32); inc->incr_src_ma = sizeof(u8); /* Reset the BDs */ tsk->index = 0; tsk->outdex = 0; memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); /* Configure some stuff */ bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA); bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); bcom_set_initiator(tsk->tasknum, priv->initiator); out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ return 0; } EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset); void bcom_gen_bd_tx_release(struct bcom_task *tsk) { /* Nothing special for the GenBD tasks */ bcom_task_free(tsk); } EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release); MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver"); MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>"); MODULE_LICENSE("GPL v2");