xtensa: s6000 dma engine support

There are four slightly different dma engines on the s6000 family.
One for memory-memory transfers, the other three for memory-device.

This patch implements a platform-specific kernel-API to control these
engines.  It is needed for the network, video, audio peripherals on
s6000.

Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Daniel Glockner <dg@emlix.com>
Signed-off-by: Fabian Godehardt <fg@emlix.com>
Cc: Daniel Glockner <dg@emlix.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Zankel <chris@zankel.net>

3 files changed, 561 insertions, 1 deletions

diff --git a/arch/xtensa/variants/s6000/Makefile b/arch/xtensa/variants/s6000/Makefile
index d83f3805130c..3e7ef0a0c498 100644
--- a/arch/xtensa/variants/s6000/Makefile
+++ b/arch/xtensa/variants/s6000/Makefile
@@ -1,4 +1,4 @@
 # s6000 Makefile
 
-obj-y           += irq.o gpio.o
+obj-y           += irq.o gpio.o dmac.o
 obj-$(CONFIG_XTENSA_CALIBRATE_CCOUNT)   += delay.o
diff --git a/arch/xtensa/variants/s6000/dmac.c b/arch/xtensa/variants/s6000/dmac.c
new file mode 100644
index 000000000000..dc7f7c573518
--- /dev/null
+++ b/arch/xtensa/variants/s6000/dmac.c
@@ -0,0 +1,173 @@
+/*
+ * Authors:     Oskar Schirmer <os@emlix.com>
+ *              Daniel Gloeckner <dg@emlix.com>
+ * (c) 2008 emlix GmbH http://www.emlix.com
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <asm/cacheflush.h>
+#include <variant/dmac.h>
+
+/* DMA engine lookup */
+
+struct s6dmac_ctrl s6dmac_ctrl[S6_DMAC_NB];
+
+
+/* DMA control, per engine */
+
+void s6dmac_put_fifo_cache(u32 dmac, int chan, u32 src, u32 dst, u32 size)
+{
+        if (xtensa_need_flush_dma_source(src)) {
+                u32 base = src;
+                u32 span = size;
+                u32 chunk = readl(DMA_CHNL(dmac, chan) + S6_DMA_CMONCHUNK);
+                if (chunk && (size > chunk)) {
+                        s32 skip =
+                                readl(DMA_CHNL(dmac, chan) + S6_DMA_SRCSKIP);
+                        u32 gaps = (size+chunk-1)/chunk - 1;
+                        if (skip >= 0) {
+                                span += gaps * skip;
+                        } else if (-skip > chunk) {
+                                s32 decr = gaps * (chunk + skip);
+                                base += decr;
+                                span = chunk - decr;
+                        } else {
+                                span = max(span + gaps * skip,
+                                        (chunk + skip) * gaps - skip);
+                        }
+                }
+                flush_dcache_unaligned(base, span);
+        }
+        if (xtensa_need_invalidate_dma_destination(dst)) {
+                u32 base = dst;
+                u32 span = size;
+                u32 chunk = readl(DMA_CHNL(dmac, chan) + S6_DMA_CMONCHUNK);
+                if (chunk && (size > chunk)) {
+                        s32 skip =
+                                readl(DMA_CHNL(dmac, chan) + S6_DMA_DSTSKIP);
+                        u32 gaps = (size+chunk-1)/chunk - 1;
+                        if (skip >= 0) {
+                                span += gaps * skip;
+                        } else if (-skip > chunk) {
+                                s32 decr = gaps * (chunk + skip);
+                                base += decr;
+                                span = chunk - decr;
+                        } else {
+                                span = max(span + gaps * skip,
+                                        (chunk + skip) * gaps - skip);
+                        }
+                }
+                invalidate_dcache_unaligned(base, span);
+        }
+        s6dmac_put_fifo(dmac, chan, src, dst, size);
+}
+
+void s6dmac_disable_error_irqs(u32 dmac, u32 mask)
+{
+        unsigned long flags;
+        spinlock_t *spinl = &s6dmac_ctrl[_dmac_addr_index(dmac)].lock;
+        spin_lock_irqsave(spinl, flags);
+        _s6dmac_disable_error_irqs(dmac, mask);
+        spin_unlock_irqrestore(spinl, flags);
+}
+
+u32 s6dmac_int_sources(u32 dmac, u32 channel)
+{
+        u32 mask, ret, tmp;
+        mask = 1 << channel;
+
+        tmp = readl(dmac + S6_DMA_TERMCNTIRQSTAT);
+        tmp &= mask;
+        writel(tmp, dmac + S6_DMA_TERMCNTIRQCLR);
+        ret = tmp >> channel;
+
+        tmp = readl(dmac + S6_DMA_PENDCNTIRQSTAT);
+        tmp &= mask;
+        writel(tmp, dmac + S6_DMA_PENDCNTIRQCLR);
+        ret |= (tmp >> channel) << 1;
+
+        tmp = readl(dmac + S6_DMA_LOWWMRKIRQSTAT);
+        tmp &= mask;
+        writel(tmp, dmac + S6_DMA_LOWWMRKIRQCLR);
+        ret |= (tmp >> channel) << 2;
+
+        tmp = readl(dmac + S6_DMA_INTRAW0);
+        tmp &= (mask << S6_DMA_INT0_OVER) | (mask << S6_DMA_INT0_UNDER);
+        writel(tmp, dmac + S6_DMA_INTCLEAR0);
+
+        if (tmp & (mask << S6_DMA_INT0_UNDER))
+                ret |= 1 << 3;
+        if (tmp & (mask << S6_DMA_INT0_OVER))
+                ret |= 1 << 4;
+
+        tmp = readl(dmac + S6_DMA_MASTERERRINFO);
+        mask <<= S6_DMA_INT1_CHANNEL;
+        if (((tmp >> S6_DMA_MASTERERR_CHAN(0)) & S6_DMA_MASTERERR_CHAN_MASK)
+                        == channel)
+                mask |= 1 << S6_DMA_INT1_MASTER;
+        if (((tmp >> S6_DMA_MASTERERR_CHAN(1)) & S6_DMA_MASTERERR_CHAN_MASK)
+                        == channel)
+                mask |= 1 << (S6_DMA_INT1_MASTER + 1);
+        if (((tmp >> S6_DMA_MASTERERR_CHAN(2)) & S6_DMA_MASTERERR_CHAN_MASK)
+                        == channel)
+                mask |= 1 << (S6_DMA_INT1_MASTER + 2);
+
+        tmp = readl(dmac + S6_DMA_INTRAW1) & mask;
+        writel(tmp, dmac + S6_DMA_INTCLEAR1);
+        ret |= ((tmp >> channel) & 1) << 5;
+        ret |= ((tmp >> S6_DMA_INT1_MASTER) & S6_DMA_INT1_MASTER_MASK) << 6;
+
+        return ret;
+}
+
+void s6dmac_release_chan(u32 dmac, int chan)
+{
+        if (chan >= 0)
+                s6dmac_disable_chan(dmac, chan);
+}
+
+
+/* global init */
+
+static inline void __init dmac_init(u32 dmac, u8 chan_nb)
+{
+        s6dmac_ctrl[S6_DMAC_INDEX(dmac)].dmac = dmac;
+        spin_lock_init(&s6dmac_ctrl[S6_DMAC_INDEX(dmac)].lock);
+        s6dmac_ctrl[S6_DMAC_INDEX(dmac)].chan_nb = chan_nb;
+        writel(S6_DMA_INT1_MASTER_MASK << S6_DMA_INT1_MASTER,
+                dmac + S6_DMA_INTCLEAR1);
+}
+
+static inline void __init dmac_master(u32 dmac,
+        u32 m0start, u32 m0end, u32 m1start, u32 m1end)
+{
+        writel(m0start, dmac + S6_DMA_MASTER0START);
+        writel(m0end - 1, dmac + S6_DMA_MASTER0END);
+        writel(m1start, dmac + S6_DMA_MASTER1START);
+        writel(m1end - 1, dmac + S6_DMA_MASTER1END);
+}
+
+static void __init s6_dmac_init(void)
+{
+        dmac_init(S6_REG_LMSDMA, S6_LMSDMA_NB);
+        dmac_master(S6_REG_LMSDMA,
+                S6_MEM_DDR, S6_MEM_PCIE_APER, S6_MEM_EFI, S6_MEM_GMAC);
+        dmac_init(S6_REG_NIDMA, S6_NIDMA_NB);
+        dmac_init(S6_REG_DPDMA, S6_DPDMA_NB);
+        dmac_master(S6_REG_DPDMA,
+                S6_MEM_DDR, S6_MEM_PCIE_APER, S6_REG_DP, S6_REG_DPDMA);
+        dmac_init(S6_REG_HIFDMA, S6_HIFDMA_NB);
+        dmac_master(S6_REG_HIFDMA,
+                S6_MEM_GMAC, S6_MEM_PCIE_CFG, S6_MEM_PCIE_APER, S6_MEM_AUX);
+}
+
+arch_initcall(s6_dmac_init);
diff --git a/arch/xtensa/variants/s6000/include/variant/dmac.h b/arch/xtensa/variants/s6000/include/variant/dmac.h
new file mode 100644
index 000000000000..89ab9484fb71
--- /dev/null
+++ b/arch/xtensa/variants/s6000/include/variant/dmac.h
@@ -0,0 +1,387 @@
+/*
+ * include/asm-xtensa/variant-s6000/dmac.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Tensilica Inc.
+ * Copyright (C) 2008 Emlix GmbH <info@emlix.com>
+ * Authors:     Fabian Godehardt <fg@emlix.com>
+ *              Oskar Schirmer <os@emlix.com>
+ *              Daniel Gloeckner <dg@emlix.com>
+ */
+
+#ifndef __ASM_XTENSA_S6000_DMAC_H
+#define __ASM_XTENSA_S6000_DMAC_H
+#include <linux/io.h>
+#include <variant/hardware.h>
+
+/* DMA global */
+
+#define S6_DMA_INTSTAT0         0x000
+#define S6_DMA_INTSTAT1         0x004
+#define S6_DMA_INTENABLE0       0x008
+#define S6_DMA_INTENABLE1       0x00C
+#define S6_DMA_INTRAW0          0x010
+#define S6_DMA_INTRAW1          0x014
+#define S6_DMA_INTCLEAR0        0x018
+#define S6_DMA_INTCLEAR1        0x01C
+#define S6_DMA_INTSET0          0x020
+#define S6_DMA_INTSET1          0x024
+#define S6_DMA_INT0_UNDER               0
+#define S6_DMA_INT0_OVER                16
+#define S6_DMA_INT1_CHANNEL             0
+#define S6_DMA_INT1_MASTER              16
+#define S6_DMA_INT1_MASTER_MASK                 7
+#define S6_DMA_TERMCNTIRQSTAT   0x028
+#define S6_DMA_TERMCNTIRQCLR    0x02C
+#define S6_DMA_TERMCNTIRQSET    0x030
+#define S6_DMA_PENDCNTIRQSTAT   0x034
+#define S6_DMA_PENDCNTIRQCLR    0x038
+#define S6_DMA_PENDCNTIRQSET    0x03C
+#define S6_DMA_LOWWMRKIRQSTAT   0x040
+#define S6_DMA_LOWWMRKIRQCLR    0x044
+#define S6_DMA_LOWWMRKIRQSET    0x048
+#define S6_DMA_MASTERERRINFO    0x04C
+#define S6_DMA_MASTERERR_CHAN(n)        (4*(n))
+#define S6_DMA_MASTERERR_CHAN_MASK              0xF
+#define S6_DMA_DESCRFIFO0       0x050
+#define S6_DMA_DESCRFIFO1       0x054
+#define S6_DMA_DESCRFIFO2       0x058
+#define S6_DMA_DESCRFIFO2_AUTODISABLE   24
+#define S6_DMA_DESCRFIFO3       0x05C
+#define S6_DMA_MASTER0START     0x060
+#define S6_DMA_MASTER0END       0x064
+#define S6_DMA_MASTER1START     0x068
+#define S6_DMA_MASTER1END       0x06C
+#define S6_DMA_NEXTFREE         0x070
+#define S6_DMA_NEXTFREE_CHAN            0
+#define S6_DMA_NEXTFREE_CHAN_MASK       0x1F
+#define S6_DMA_NEXTFREE_ENA             16
+#define S6_DMA_NEXTFREE_ENA_MASK        ((1 << 16) - 1)
+#define S6_DMA_DPORTCTRLGRP(p)  ((p) * 4 + 0x074)
+#define S6_DMA_DPORTCTRLGRP_FRAMEREP    0
+#define S6_DMA_DPORTCTRLGRP_NRCHANS     1
+#define S6_DMA_DPORTCTRLGRP_NRCHANS_1           0
+#define S6_DMA_DPORTCTRLGRP_NRCHANS_3           1
+#define S6_DMA_DPORTCTRLGRP_NRCHANS_4           2
+#define S6_DMA_DPORTCTRLGRP_NRCHANS_2           3
+#define S6_DMA_DPORTCTRLGRP_ENA         31
+
+
+/* DMA per channel */
+
+#define DMA_CHNL(dmac, n)       ((dmac) + 0x1000 + (n) * 0x100)
+#define DMA_INDEX_CHNL(addr)    (((addr) >> 8) & 0xF)
+#define DMA_MASK_DMAC(addr)     ((addr) & 0xFFFF0000)
+#define S6_DMA_CHNCTRL          0x000
+#define S6_DMA_CHNCTRL_ENABLE           0
+#define S6_DMA_CHNCTRL_PAUSE            1
+#define S6_DMA_CHNCTRL_PRIO             2
+#define S6_DMA_CHNCTRL_PRIO_MASK                3
+#define S6_DMA_CHNCTRL_PERIPHXFER       4
+#define S6_DMA_CHNCTRL_PERIPHENA        5
+#define S6_DMA_CHNCTRL_SRCINC           6
+#define S6_DMA_CHNCTRL_DSTINC           7
+#define S6_DMA_CHNCTRL_BURSTLOG         8
+#define S6_DMA_CHNCTRL_BURSTLOG_MASK            7
+#define S6_DMA_CHNCTRL_DESCFIFODEPTH    12
+#define S6_DMA_CHNCTRL_DESCFIFODEPTH_MASK       0x1F
+#define S6_DMA_CHNCTRL_DESCFIFOFULL     17
+#define S6_DMA_CHNCTRL_BWCONSEL         18
+#define S6_DMA_CHNCTRL_BWCONENA         19
+#define S6_DMA_CHNCTRL_PENDGCNTSTAT     20
+#define S6_DMA_CHNCTRL_PENDGCNTSTAT_MASK        0x3F
+#define S6_DMA_CHNCTRL_LOWWMARK         26
+#define S6_DMA_CHNCTRL_LOWWMARK_MASK            0xF
+#define S6_DMA_CHNCTRL_TSTAMP           30
+#define S6_DMA_TERMCNTNB        0x004
+#define S6_DMA_TERMCNTNB_MASK                   0xFFFF
+#define S6_DMA_TERMCNTTMO       0x008
+#define S6_DMA_TERMCNTSTAT      0x00C
+#define S6_DMA_TERMCNTSTAT_MASK         0xFF
+#define S6_DMA_CMONCHUNK        0x010
+#define S6_DMA_SRCSKIP          0x014
+#define S6_DMA_DSTSKIP          0x018
+#define S6_DMA_CUR_SRC          0x024
+#define S6_DMA_CUR_DST          0x028
+#define S6_DMA_TIMESTAMP        0x030
+
+/* DMA channel lists */
+
+#define S6_DPDMA_CHAN(stream, channel)  (4 * (stream) + (channel))
+#define S6_DPDMA_NB     16
+
+#define S6_HIFDMA_GMACTX        0
+#define S6_HIFDMA_GMACRX        1
+#define S6_HIFDMA_I2S0          2
+#define S6_HIFDMA_I2S1          3
+#define S6_HIFDMA_EGIB          4
+#define S6_HIFDMA_PCITX         5
+#define S6_HIFDMA_PCIRX         6
+#define S6_HIFDMA_NB    7
+
+#define S6_NIDMA_NB     4
+
+#define S6_LMSDMA_NB    12
+
+/* controller access */
+
+#define S6_DMAC_NB      4
+#define S6_DMAC_INDEX(dmac)     (((unsigned)(dmac) >> 18) % S6_DMAC_NB)
+
+struct s6dmac_ctrl {
+        u32 dmac;
+        spinlock_t lock;
+        u8 chan_nb;
+};
+
+extern struct s6dmac_ctrl s6dmac_ctrl[S6_DMAC_NB];
+
+
+/* DMA control, per channel */
+
+static inline int s6dmac_fifo_full(u32 dmac, int chan)
+{
+        return (readl(DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL)
+                & (1 << S6_DMA_CHNCTRL_DESCFIFOFULL)) && 1;
+}
+
+static inline int s6dmac_termcnt_irq(u32 dmac, int chan)
+{
+        u32 m = 1 << chan;
+        int r = (readl(dmac + S6_DMA_TERMCNTIRQSTAT) & m) && 1;
+        if (r)
+                writel(m, dmac + S6_DMA_TERMCNTIRQCLR);
+        return r;
+}
+
+static inline int s6dmac_pendcnt_irq(u32 dmac, int chan)
+{
+        u32 m = 1 << chan;
+        int r = (readl(dmac + S6_DMA_PENDCNTIRQSTAT) & m) && 1;
+        if (r)
+                writel(m, dmac + S6_DMA_PENDCNTIRQCLR);
+        return r;
+}
+
+static inline int s6dmac_lowwmark_irq(u32 dmac, int chan)
+{
+        int r = (readl(dmac + S6_DMA_LOWWMRKIRQSTAT) & (1 << chan)) ? 1 : 0;
+        if (r)
+                writel(1 << chan, dmac + S6_DMA_LOWWMRKIRQCLR);
+        return r;
+}
+
+static inline u32 s6dmac_pending_count(u32 dmac, int chan)
+{
+        return (readl(DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL)
+                        >> S6_DMA_CHNCTRL_PENDGCNTSTAT)
+                & S6_DMA_CHNCTRL_PENDGCNTSTAT_MASK;
+}
+
+static inline void s6dmac_set_terminal_count(u32 dmac, int chan, u32 n)
+{
+        n &= S6_DMA_TERMCNTNB_MASK;
+        n |= readl(DMA_CHNL(dmac, chan) + S6_DMA_TERMCNTNB)
+              & ~S6_DMA_TERMCNTNB_MASK;
+        writel(n, DMA_CHNL(dmac, chan) + S6_DMA_TERMCNTNB);
+}
+
+static inline u32 s6dmac_get_terminal_count(u32 dmac, int chan)
+{
+        return (readl(DMA_CHNL(dmac, chan) + S6_DMA_TERMCNTNB))
+                & S6_DMA_TERMCNTNB_MASK;
+}
+
+static inline u32 s6dmac_timestamp(u32 dmac, int chan)
+{
+        return readl(DMA_CHNL(dmac, chan) + S6_DMA_TIMESTAMP);
+}
+
+static inline u32 s6dmac_cur_src(u32 dmac, int chan)
+{
+        return readl(DMA_CHNL(dmac, chan) + S6_DMA_CUR_SRC);
+}
+
+static inline u32 s6dmac_cur_dst(u32 dmac, int chan)
+{
+        return readl(DMA_CHNL(dmac, chan) + S6_DMA_CUR_DST);
+}
+
+static inline void s6dmac_disable_chan(u32 dmac, int chan)
+{
+        u32 ctrl;
+        writel(readl(DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL)
+                & ~(1 << S6_DMA_CHNCTRL_ENABLE),
+                DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL);
+        do
+                ctrl = readl(DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL);
+        while (ctrl & (1 << S6_DMA_CHNCTRL_ENABLE));
+}
+
+static inline void s6dmac_set_stride_skip(u32 dmac, int chan,
+        int comchunk,           /* 0: disable scatter/gather */
+        int srcskip, int dstskip)
+{
+        writel(comchunk, DMA_CHNL(dmac, chan) + S6_DMA_CMONCHUNK);
+        writel(srcskip, DMA_CHNL(dmac, chan) + S6_DMA_SRCSKIP);
+        writel(dstskip, DMA_CHNL(dmac, chan) + S6_DMA_DSTSKIP);
+}
+
+static inline void s6dmac_enable_chan(u32 dmac, int chan,
+        int prio,               /* 0 (highest) .. 3 (lowest) */
+        int periphxfer,         /* <0: disable p.req.line, 0..1: mode */
+        int srcinc, int dstinc, /* 0: dont increment src/dst address */
+        int comchunk,           /* 0: disable scatter/gather */
+        int srcskip, int dstskip,
+        int burstsize,          /* 4 for I2S, 7 for everything else */
+        int bandwidthconserve,  /* <0: disable, 0..1: select */
+        int lowwmark,           /* 0..15 */
+        int timestamp,          /* 0: disable timestamp */
+        int enable)             /* 0: disable for now */
+{
+        writel(1, DMA_CHNL(dmac, chan) + S6_DMA_TERMCNTNB);
+        writel(0, DMA_CHNL(dmac, chan) + S6_DMA_TERMCNTTMO);
+        writel(lowwmark << S6_DMA_CHNCTRL_LOWWMARK,
+                DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL);
+        s6dmac_set_stride_skip(dmac, chan, comchunk, srcskip, dstskip);
+        writel(((enable ? 1 : 0) << S6_DMA_CHNCTRL_ENABLE) |
+                (prio << S6_DMA_CHNCTRL_PRIO) |
+                (((periphxfer > 0) ? 1 : 0) << S6_DMA_CHNCTRL_PERIPHXFER) |
+                (((periphxfer < 0) ? 0 : 1) << S6_DMA_CHNCTRL_PERIPHENA) |
+                ((srcinc ? 1 : 0) << S6_DMA_CHNCTRL_SRCINC) |
+                ((dstinc ? 1 : 0) << S6_DMA_CHNCTRL_DSTINC) |
+                (burstsize << S6_DMA_CHNCTRL_BURSTLOG) |
+                (((bandwidthconserve > 0) ? 1 : 0) << S6_DMA_CHNCTRL_BWCONSEL) |
+                (((bandwidthconserve < 0) ? 0 : 1) << S6_DMA_CHNCTRL_BWCONENA) |
+                (lowwmark << S6_DMA_CHNCTRL_LOWWMARK) |
+                ((timestamp ? 1 : 0) << S6_DMA_CHNCTRL_TSTAMP),
+                DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL);
+}
+
+
+/* DMA control, per engine */
+
+static inline unsigned _dmac_addr_index(u32 dmac)
+{
+        unsigned i = S6_DMAC_INDEX(dmac);
+        if (s6dmac_ctrl[i].dmac != dmac)
+                BUG();
+        return i;
+}
+
+static inline void _s6dmac_disable_error_irqs(u32 dmac, u32 mask)
+{
+        writel(mask, dmac + S6_DMA_TERMCNTIRQCLR);
+        writel(mask, dmac + S6_DMA_PENDCNTIRQCLR);
+        writel(mask, dmac + S6_DMA_LOWWMRKIRQCLR);
+        writel(readl(dmac + S6_DMA_INTENABLE0)
+                & ~((mask << S6_DMA_INT0_UNDER) | (mask << S6_DMA_INT0_OVER)),
+                dmac + S6_DMA_INTENABLE0);
+        writel(readl(dmac + S6_DMA_INTENABLE1) & ~(mask << S6_DMA_INT1_CHANNEL),
+                dmac + S6_DMA_INTENABLE1);
+        writel((mask << S6_DMA_INT0_UNDER) | (mask << S6_DMA_INT0_OVER),
+                dmac + S6_DMA_INTCLEAR0);
+        writel(mask << S6_DMA_INT1_CHANNEL, dmac + S6_DMA_INTCLEAR1);
+}
+
+/*
+ * request channel from specified engine
+ * with chan<0, accept any channel
+ * further parameters see s6dmac_enable_chan
+ * returns < 0 upon error, channel nb otherwise
+ */
+static inline int s6dmac_request_chan(u32 dmac, int chan,
+        int prio,
+        int periphxfer,
+        int srcinc, int dstinc,
+        int comchunk,
+        int srcskip, int dstskip,
+        int burstsize,
+        int bandwidthconserve,
+        int lowwmark,
+        int timestamp,
+        int enable)
+{
+        int r = chan;
+        unsigned long flags;
+        spinlock_t *spinl = &s6dmac_ctrl[_dmac_addr_index(dmac)].lock;
+        spin_lock_irqsave(spinl, flags);
+        if (r < 0) {
+                r = (readl(dmac + S6_DMA_NEXTFREE) >> S6_DMA_NEXTFREE_CHAN)
+                        & S6_DMA_NEXTFREE_CHAN_MASK;
+        }
+        if (r >= s6dmac_ctrl[_dmac_addr_index(dmac)].chan_nb) {
+                if (chan < 0)
+                        r = -EBUSY;
+                else
+                        r = -ENXIO;
+        } else if (((readl(dmac + S6_DMA_NEXTFREE) >> S6_DMA_NEXTFREE_ENA)
+                        >> r) & 1) {
+                r = -EBUSY;
+        } else {
+                s6dmac_enable_chan(dmac, r, prio, periphxfer,
+                        srcinc, dstinc, comchunk, srcskip, dstskip, burstsize,
+                        bandwidthconserve, lowwmark, timestamp, enable);
+        }
+        spin_unlock_irqrestore(spinl, flags);
+        return r;
+}
+
+static inline void s6dmac_put_fifo(u32 dmac, int chan,
+        u32 src, u32 dst, u32 size)
+{
+        unsigned long flags;
+        spinlock_t *spinl = &s6dmac_ctrl[_dmac_addr_index(dmac)].lock;
+        spin_lock_irqsave(spinl, flags);
+        writel(src, dmac + S6_DMA_DESCRFIFO0);
+        writel(dst, dmac + S6_DMA_DESCRFIFO1);
+        writel(size, dmac + S6_DMA_DESCRFIFO2);
+        writel(chan, dmac + S6_DMA_DESCRFIFO3);
+        spin_unlock_irqrestore(spinl, flags);
+}
+
+static inline u32 s6dmac_channel_enabled(u32 dmac, int chan)
+{
+        return readl(DMA_CHNL(dmac, chan) + S6_DMA_CHNCTRL) &
+                        (1 << S6_DMA_CHNCTRL_ENABLE);
+}
+
+/*
+ * group 1-4 data port channels
+ * with port=0..3, nrch=1-4 channels,
+ * frrep=0/1 (dis- or enable frame repeat)
+ */
+static inline void s6dmac_dp_setup_group(u32 dmac, int port,
+                        int nrch, int frrep)
+{
+        const static u8 mask[4] = {0, 3, 1, 2};
+        BUG_ON(dmac != S6_REG_DPDMA);
+        if ((port < 0) || (port > 3) || (nrch < 1) || (nrch > 4))
+                return;
+        writel((mask[nrch - 1] << S6_DMA_DPORTCTRLGRP_NRCHANS)
+                | ((frrep ? 1 : 0) << S6_DMA_DPORTCTRLGRP_FRAMEREP),
+                dmac + S6_DMA_DPORTCTRLGRP(port));
+}
+
+static inline void s6dmac_dp_switch_group(u32 dmac, int port, int enable)
+{
+        u32 tmp;
+        BUG_ON(dmac != S6_REG_DPDMA);
+        tmp = readl(dmac + S6_DMA_DPORTCTRLGRP(port));
+        if (enable)
+                tmp |= (1 << S6_DMA_DPORTCTRLGRP_ENA);
+        else
+                tmp &= ~(1 << S6_DMA_DPORTCTRLGRP_ENA);
+        writel(tmp, dmac + S6_DMA_DPORTCTRLGRP(port));
+}
+
+extern void s6dmac_put_fifo_cache(u32 dmac, int chan,
+        u32 src, u32 dst, u32 size);
+extern void s6dmac_disable_error_irqs(u32 dmac, u32 mask);
+extern u32 s6dmac_int_sources(u32 dmac, u32 channel);
+extern void s6dmac_release_chan(u32 dmac, int chan);
+
+#endif /* __ASM_XTENSA_S6000_DMAC_H */