[POWERPC] bestcomm: GenBD task support

This is the microcode for the GenBD task and the associated
support code. This is a generic task that copy data to/from
a hardware FIFO. This is currently locked to 32bits wide
access but could be extended as needed.

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, 260 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/bestcomm/gen_bd.c b/arch/powerpc/sysdev/bestcomm/gen_bd.c
new file mode 100644
index 000000000000..8d33eafbb3f4
--- /dev/null
+++ b/arch/powerpc/sysdev/bestcomm/gen_bd.c
@@ -0,0 +1,260 @@
+/*
+ * 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");
+