[POWERPC] bestcomm: FEC task support

This is the microcode for the FEC task and the associated
support code.

The microcode itself comes directly from the offical
API (v2.2)

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 270 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/bestcomm/fec.c b/arch/powerpc/sysdev/bestcomm/fec.c
new file mode 100644
index 000000000000..957a988d23ea
--- /dev/null
+++ b/arch/powerpc/sysdev/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 "bestcomm.h"
+#include "bestcomm_priv.h"
+#include "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");
+