powerpc, dma: move bestcomm driver from arch/powerpc/sysdev to drivers/dma

The bestcomm dma hardware, and some of its users like the FEC ethernet
component, is used in different FreeScale parts, including non-powerpc
parts like the ColdFire MCF547x & MCF548x families.  Don't keep the
driver hidden in arch/powerpc where it is inaccessible for other arches.
.c files are moved to drivers/dma/bestcomm, while .h files are moved to
include/linux/fsl/bestcomm.  Makefiles, Kconfigs and #include directives
are updated for the new file locations.

Tested by recompiling for MPC5200 with all bestcomm users enabled.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Anatolij Gustschin <agust@denx.de>

1 files changed, 270 insertions, 0 deletions

diff --git a/drivers/dma/bestcomm/fec.c b/drivers/dma/bestcomm/fec.c
new file mode 100644
index 000000000000..7f1fb1c999e4
--- /dev/null
+++ b/drivers/dma/bestcomm/fec.c
@@ -0,0 +1,270 @@
+/*
+ * 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> )
+ *
+ * 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/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(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(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");
+