[POWERPC] bestcomm: ATA task support

This is the microcode for the ATA 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>

5 files changed, 267 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/bestcomm/Kconfig b/arch/powerpc/sysdev/bestcomm/Kconfig
index 3366e24c10d6..9d087cefa22c 100644
--- a/arch/powerpc/sysdev/bestcomm/Kconfig
+++ b/arch/powerpc/sysdev/bestcomm/Kconfig
@@ -16,3 +16,10 @@ config PPC_BESTCOMM
           If you want to use drivers that require DMA operations,
           answer Y or M. Otherwise say N.
 
+config PPC_BESTCOMM_ATA
+        tristate "Bestcomm ATA task support"
+        depends on PPC_BESTCOMM
+        default n
+        help
+          This option enables the support for the ATA task.
+
diff --git a/arch/powerpc/sysdev/bestcomm/Makefile b/arch/powerpc/sysdev/bestcomm/Makefile
index a24aa06faaf5..b7a6a40c7d23 100644
--- a/arch/powerpc/sysdev/bestcomm/Makefile
+++ b/arch/powerpc/sysdev/bestcomm/Makefile
@@ -3,6 +3,8 @@
 #
 
 bestcomm-core-objs      := bestcomm.o sram.o
+bestcomm-ata-objs       := ata.o bcom_ata_task.o
 
 obj-$(CONFIG_PPC_BESTCOMM)              += bestcomm-core.o
+obj-$(CONFIG_PPC_BESTCOMM_ATA)          += bestcomm-ata.o
  
diff --git a/arch/powerpc/sysdev/bestcomm/ata.c b/arch/powerpc/sysdev/bestcomm/ata.c
new file mode 100644
index 000000000000..1f5258fb38c3
--- /dev/null
+++ b/arch/powerpc/sysdev/bestcomm/ata.c
@@ -0,0 +1,154 @@
+/*
+ * 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 "bestcomm.h"
+#include "bestcomm_priv.h"
+#include "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;
+
+        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");
+
diff --git a/arch/powerpc/sysdev/bestcomm/ata.h b/arch/powerpc/sysdev/bestcomm/ata.h
new file mode 100644
index 000000000000..10982769c465
--- /dev/null
+++ b/arch/powerpc/sysdev/bestcomm/ata.h
@@ -0,0 +1,37 @@
+/*
+ * Header for Bestcomm ATA task driver
+ *
+ *
+ * Copyright (C) 2006 Freescale - John Rigby
+ * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.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.
+ */
+
+#ifndef __BESTCOMM_ATA_H__
+#define __BESTCOMM_ATA_H__
+
+
+struct bcom_ata_bd {
+        u32     status;
+        u32     dst_pa;
+        u32     src_pa;
+};
+
+extern struct bcom_task *
+bcom_ata_init(int queue_len, int maxbufsize);
+
+extern void
+bcom_ata_rx_prepare(struct bcom_task *tsk);
+
+extern void
+bcom_ata_tx_prepare(struct bcom_task *tsk);
+
+extern void
+bcom_ata_reset_bd(struct bcom_task *tsk);
+
+
+#endif /* __BESTCOMM_ATA_H__ */
+
diff --git a/arch/powerpc/sysdev/bestcomm/bcom_ata_task.c b/arch/powerpc/sysdev/bestcomm/bcom_ata_task.c
new file mode 100644
index 000000000000..cc6049a4e469
--- /dev/null
+++ b/arch/powerpc/sysdev/bestcomm/bcom_ata_task.c
@@ -0,0 +1,67 @@
+/*
+ * Bestcomm ATA task microcode
+ *
+ * Copyright (c) 2004 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ *
+ * Created based on bestcom/code_dma/image_rtos1/dma_image.hex
+ */
+
+#include <asm/types.h>
+
+/*
+ * The header consists of the following fields:
+ *      u32     magic;
+ *      u8      desc_size;
+ *      u8      var_size;
+ *      u8      inc_size;
+ *      u8      first_var;
+ *      u8      reserved[8];
+ *
+ * The size fields contain the number of 32-bit words.
+ */
+
+u32 bcom_ata_task[] = {
+        /* header */
+        0x4243544b,
+        0x0e060709,
+        0x00000000,
+        0x00000000,
+
+        /* Task descriptors */
+        0x8198009b, /* LCD: idx0 = var3; idx0 <= var2; idx0 += inc3 */
+        0x13e00c08, /*   DRD1A: var3 = var1; FN=0 MORE init=31 WS=0 RS=0 */
+        0xb8000264, /*   LCD: idx1 = *idx0, idx2 = var0; idx1 < var9; idx1 += inc4, idx2 += inc4 */
+        0x10000f00, /*     DRD1A: var3 = idx0; FN=0 MORE init=0 WS=0 RS=0 */
+        0x60140002, /*     DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */
+        0x0c8cfc8a, /*     DRD2B1: *idx2 = EU3(); EU3(*idx2,var10)  */
+        0xd8988240, /*   LCDEXT: idx1 = idx1; idx1 > var9; idx1 += inc0 */
+        0xf845e011, /*   LCDEXT: idx2 = *(idx0 + var00000015); ; idx2 += inc2 */
+        0xb845e00a, /*   LCD: idx3 = *(idx0 + var00000019); ; idx3 += inc1 */
+        0x0bfecf90, /*     DRD1A: *idx3 = *idx2; FN=0 TFD init=31 WS=3 RS=3 */
+        0x9898802d, /*   LCD: idx1 = idx1; idx1 once var0; idx1 += inc5 */
+        0x64000005, /*     DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 INT EXT init=0 WS=0 RS=0 */
+        0x0c0cf849, /*     DRD2B1: *idx0 = EU3(); EU3(idx1,var9)  */
+        0x000001f8, /* NOP */
+
+        /* VAR[9]-VAR[14] */
+        0x40000000,
+        0x7fff7fff,
+        0x00000000,
+        0x00000000,
+        0x00000000,
+        0x00000000,
+
+        /* INC[0]-INC[6] */
+        0x40000000,
+        0xe0000000,
+        0xe0000000,
+        0xa000000c,
+        0x20000000,
+        0x00000000,
+        0x00000000,
+};
+