Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / dma / bestcomm / ata.c

diff --git a/kernel/drivers/dma/bestcomm/ata.c b/kernel/drivers/dma/bestcomm/ata.c
new file mode 100644 (file)
index 0000000..2fd87f8
--- /dev/null
+++ b/kernel/drivers/dma/bestcomm/ata.c
@@ -0,0 +1,157 @@
+/*
+ * Bestcomm ATA task driver
+ *
+ *
+ * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
+ *                                   2003-2004 (c) MontaVista, Software, Inc.
+ *
+ * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2006      Freescale - John Rigby
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#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/ata.h>
+
+
+/* ======================================================================== */
+/* Task image/var/inc                                                       */
+/* ======================================================================== */
+
+/* ata task image */
+extern u32 bcom_ata_task[];
+
+/* ata task vars that need to be set before enabling the task */
+struct bcom_ata_var {
+       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;        /* size of receive buffer */
+};
+
+/* ata task incs that need to be set before enabling the task */
+struct bcom_ata_inc {
+       u16 pad0;
+       s16 incr_bytes;
+       u16 pad1;
+       s16 incr_dst;
+       u16 pad2;
+       s16 incr_src;
+};
+
+
+/* ======================================================================== */
+/* Task support code                                                        */
+/* ======================================================================== */
+
+struct bcom_task *
+bcom_ata_init(int queue_len, int maxbufsize)
+{
+       struct bcom_task *tsk;
+       struct bcom_ata_var *var;
+       struct bcom_ata_inc *inc;
+
+       /* Prefetch breaks ATA DMA.  Turn it off for ATA DMA */
+       bcom_disable_prefetch();
+
+       tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
+       if (!tsk)
+               return NULL;
+
+       tsk->flags = BCOM_FLAGS_NONE;
+
+       bcom_ata_reset_bd(tsk);
+
+       var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
+       inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
+
+       if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
+               bcom_task_free(tsk);
+               return NULL;
+       }
+
+       var->enable     = bcom_eng->regs_base +
+                               offsetof(struct mpc52xx_sdma, tcr[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;
+       var->buffer_size = maxbufsize;
+
+       /* Configure some stuff */
+       bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
+       bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
+
+       out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
+       out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
+
+       out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
+
+       return tsk;
+}
+EXPORT_SYMBOL_GPL(bcom_ata_init);
+
+void bcom_ata_rx_prepare(struct bcom_task *tsk)
+{
+       struct bcom_ata_inc *inc;
+
+       inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
+
+       inc->incr_bytes = -(s16)sizeof(u32);
+       inc->incr_src   = 0;
+       inc->incr_dst   = sizeof(u32);
+
+       bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
+}
+EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
+
+void bcom_ata_tx_prepare(struct bcom_task *tsk)
+{
+       struct bcom_ata_inc *inc;
+
+       inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
+
+       inc->incr_bytes = -(s16)sizeof(u32);
+       inc->incr_src   = sizeof(u32);
+       inc->incr_dst   = 0;
+
+       bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
+}
+EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
+
+void bcom_ata_reset_bd(struct bcom_task *tsk)
+{
+       struct bcom_ata_var *var;
+
+       /* Reset all BD */
+       memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
+
+       tsk->index = 0;
+       tsk->outdex = 0;
+
+       var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
+       var->bd_start = var->bd_base;
+}
+EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
+
+void bcom_ata_release(struct bcom_task *tsk)
+{
+       /* Nothing special for the ATA tasks */
+       bcom_task_free(tsk);
+}
+EXPORT_SYMBOL_GPL(bcom_ata_release);
+
+
+MODULE_DESCRIPTION("BestComm ATA task driver");
+MODULE_AUTHOR("John Rigby");
+MODULE_LICENSE("GPL v2");
+