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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Bestcomm ATA task driver4 *5 * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>6 * 2003-2004 (c) MontaVista, Software, Inc.7 *8 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>9 * Copyright (C) 2006 Freescale - John Rigby10 */11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/types.h>15#include <asm/io.h>16 17#include <linux/fsl/bestcomm/bestcomm.h>18#include <linux/fsl/bestcomm/bestcomm_priv.h>19#include <linux/fsl/bestcomm/ata.h>20 21 22/* ======================================================================== */23/* Task image/var/inc */24/* ======================================================================== */25 26/* ata task image */27extern u32 bcom_ata_task[];28 29/* ata task vars that need to be set before enabling the task */30struct bcom_ata_var {31 u32 enable; /* (u16*) address of task's control register */32 u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */33 u32 bd_last; /* (struct bcom_bd*) end of ring buffer */34 u32 bd_start; /* (struct bcom_bd*) current bd */35 u32 buffer_size; /* size of receive buffer */36};37 38/* ata task incs that need to be set before enabling the task */39struct bcom_ata_inc {40 u16 pad0;41 s16 incr_bytes;42 u16 pad1;43 s16 incr_dst;44 u16 pad2;45 s16 incr_src;46};47 48 49/* ======================================================================== */50/* Task support code */51/* ======================================================================== */52 53struct bcom_task *54bcom_ata_init(int queue_len, int maxbufsize)55{56 struct bcom_task *tsk;57 struct bcom_ata_var *var;58 struct bcom_ata_inc *inc;59 60 /* Prefetch breaks ATA DMA. Turn it off for ATA DMA */61 bcom_disable_prefetch();62 63 tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);64 if (!tsk)65 return NULL;66 67 tsk->flags = BCOM_FLAGS_NONE;68 69 bcom_ata_reset_bd(tsk);70 71 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);72 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);73 74 if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {75 bcom_task_free(tsk);76 return NULL;77 }78 79 var->enable = bcom_eng->regs_base +80 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);81 var->bd_base = tsk->bd_pa;82 var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);83 var->bd_start = tsk->bd_pa;84 var->buffer_size = maxbufsize;85 86 /* Configure some stuff */87 bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);88 bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);89 90 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);91 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);92 93 out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */94 95 return tsk;96}97EXPORT_SYMBOL_GPL(bcom_ata_init);98 99void bcom_ata_rx_prepare(struct bcom_task *tsk)100{101 struct bcom_ata_inc *inc;102 103 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);104 105 inc->incr_bytes = -(s16)sizeof(u32);106 inc->incr_src = 0;107 inc->incr_dst = sizeof(u32);108 109 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);110}111EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);112 113void bcom_ata_tx_prepare(struct bcom_task *tsk)114{115 struct bcom_ata_inc *inc;116 117 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);118 119 inc->incr_bytes = -(s16)sizeof(u32);120 inc->incr_src = sizeof(u32);121 inc->incr_dst = 0;122 123 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);124}125EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);126 127void bcom_ata_reset_bd(struct bcom_task *tsk)128{129 struct bcom_ata_var *var;130 131 /* Reset all BD */132 memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);133 134 tsk->index = 0;135 tsk->outdex = 0;136 137 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);138 var->bd_start = var->bd_base;139}140EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);141 142void bcom_ata_release(struct bcom_task *tsk)143{144 /* Nothing special for the ATA tasks */145 bcom_task_free(tsk);146}147EXPORT_SYMBOL_GPL(bcom_ata_release);148 149 150MODULE_DESCRIPTION("BestComm ATA task driver");151MODULE_AUTHOR("John Rigby");152MODULE_LICENSE("GPL v2");153