Hi,
As I know there's are PL330 DMA implementation by
MODULE_AUTHOR("Jaswinder Singh <jassi.brar@xxxxxxxxxxx>");
Doesn't it better to use the generic PL330 instead of Samsung specific
PL330 implementation?
As I remember Jassi has a plan to use generic one?
Thank you,
Kyungmin Park
On Tue, Jun 7, 2011 at 4:48 PM, root <alim.akhtar@xxxxxxxxxxx> wrote:
> Signed-off-by: alim.akhtar <alim.akhtar@xxxxxxxxxxx>
> ---
> arch/arm/configs/exynos4_defconfig | 1 +
> arch/arm/configs/s5p64x0_defconfig | 1 +
> arch/arm/configs/s5pc100_defconfig | 1 +
> arch/arm/configs/s5pv210_defconfig | 1 +
> arch/arm/plat-samsung/Kconfig | 6 -
> arch/arm/plat-samsung/Makefile | 2 -
> arch/arm/plat-samsung/s3c-pl330.c | 1244 ------------------------------------
> drivers/dma/Kconfig | 8 +
> drivers/dma/Makefile | 2 +
> drivers/dma/s3c-pl330.c | 1244 ++++++++++++++++++++++++++++++++++++
> 10 files changed, 1258 insertions(+), 1252 deletions(-)
> delete mode 100644 arch/arm/plat-samsung/s3c-pl330.c
> create mode 100644 drivers/dma/s3c-pl330.c
>
> diff --git a/arch/arm/configs/exynos4_defconfig b/arch/arm/configs/exynos4_defconfig
> index da53ff3..6421074 100644
> --- a/arch/arm/configs/exynos4_defconfig
> +++ b/arch/arm/configs/exynos4_defconfig
> @@ -37,6 +37,7 @@ CONFIG_SERIAL_SAMSUNG=y
> CONFIG_SERIAL_SAMSUNG_CONSOLE=y
> CONFIG_HW_RANDOM=y
> CONFIG_I2C=y
> +CONFIG_DMADEVICES=y
> # CONFIG_HWMON is not set
> # CONFIG_MFD_SUPPORT is not set
> # CONFIG_HID_SUPPORT is not set
> diff --git a/arch/arm/configs/s5p64x0_defconfig b/arch/arm/configs/s5p64x0_defconfig
> index ad6b61b..9340ffc 100644
> --- a/arch/arm/configs/s5p64x0_defconfig
> +++ b/arch/arm/configs/s5p64x0_defconfig
> @@ -31,6 +31,7 @@ CONFIG_SERIAL_8250_NR_UARTS=3
> CONFIG_SERIAL_SAMSUNG=y
> CONFIG_SERIAL_SAMSUNG_CONSOLE=y
> CONFIG_HW_RANDOM=y
> +CONFIG_DMADEVICES=y
> # CONFIG_HWMON is not set
> CONFIG_DISPLAY_SUPPORT=y
> # CONFIG_VGA_CONSOLE is not set
> diff --git a/arch/arm/configs/s5pc100_defconfig b/arch/arm/configs/s5pc100_defconfig
> index 41bafc9..694ef97 100644
> --- a/arch/arm/configs/s5pc100_defconfig
> +++ b/arch/arm/configs/s5pc100_defconfig
> @@ -20,6 +20,7 @@ CONFIG_SERIAL_SAMSUNG_CONSOLE=y
> CONFIG_HW_RANDOM=y
> CONFIG_I2C=y
> CONFIG_I2C_CHARDEV=y
> +CONFIG_DMADEVICES=y
> # CONFIG_VGA_CONSOLE is not set
> CONFIG_MMC=y
> CONFIG_MMC_DEBUG=y
> diff --git a/arch/arm/configs/s5pv210_defconfig b/arch/arm/configs/s5pv210_defconfig
> index fa98990..0013593 100644
> --- a/arch/arm/configs/s5pv210_defconfig
> +++ b/arch/arm/configs/s5pv210_defconfig
> @@ -37,6 +37,7 @@ CONFIG_SERIAL_8250=y
> CONFIG_SERIAL_SAMSUNG=y
> CONFIG_SERIAL_SAMSUNG_CONSOLE=y
> CONFIG_HW_RANDOM=y
> +CONFIG_DMADEVICES=y
> # CONFIG_HWMON is not set
> # CONFIG_VGA_CONSOLE is not set
> # CONFIG_HID_SUPPORT is not set
> diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
> index 4d79519..9607ac4 100644
> --- a/arch/arm/plat-samsung/Kconfig
> +++ b/arch/arm/plat-samsung/Kconfig
> @@ -294,12 +294,6 @@ config S3C_DMA
> help
> Internal configuration for S3C DMA core
>
> -config S3C_PL330_DMA
> - bool
> - select PL330
> - help
> - S3C DMA API Driver for PL330 DMAC.
> -
> comment "Power management"
>
> config SAMSUNG_PM_DEBUG
> diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
> index 53eb15b..895c697 100644
> --- a/arch/arm/plat-samsung/Makefile
> +++ b/arch/arm/plat-samsung/Makefile
> @@ -64,8 +64,6 @@ obj-$(CONFIG_SAMSUNG_DEV_PWM) += dev-pwm.o
>
> obj-$(CONFIG_S3C_DMA) += dma.o
>
> -obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o
> -
> # PM support
>
> obj-$(CONFIG_PM) += pm.o
> diff --git a/arch/arm/plat-samsung/s3c-pl330.c b/arch/arm/plat-samsung/s3c-pl330.c
> deleted file mode 100644
> index f85638c..0000000
> --- a/arch/arm/plat-samsung/s3c-pl330.c
> +++ /dev/null
> @@ -1,1244 +0,0 @@
> -/* linux/arch/arm/plat-samsung/s3c-pl330.c
> - *
> - * Copyright (C) 2010 Samsung Electronics Co. Ltd.
> - * Jaswinder Singh <jassi.brar@xxxxxxxxxxx>
> - *
> - * 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/init.h>
> -#include <linux/module.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/slab.h>
> -#include <linux/platform_device.h>
> -#include <linux/clk.h>
> -#include <linux/err.h>
> -
> -#include <asm/hardware/pl330.h>
> -
> -#include <plat/s3c-pl330-pdata.h>
> -
> -/**
> - * struct s3c_pl330_dmac - Logical representation of a PL330 DMAC.
> - * @busy_chan: Number of channels currently busy.
> - * @peri: List of IDs of peripherals this DMAC can work with.
> - * @node: To attach to the global list of DMACs.
> - * @pi: PL330 configuration info for the DMAC.
> - * @kmcache: Pool to quickly allocate xfers for all channels in the dmac.
> - * @clk: Pointer of DMAC operation clock.
> - */
> -struct s3c_pl330_dmac {
> - unsigned busy_chan;
> - enum dma_ch *peri;
> - struct list_head node;
> - struct pl330_info *pi;
> - struct kmem_cache *kmcache;
> - struct clk *clk;
> -};
> -
> -/**
> - * struct s3c_pl330_xfer - A request submitted by S3C DMA clients.
> - * @token: Xfer ID provided by the client.
> - * @node: To attach to the list of xfers on a channel.
> - * @px: Xfer for PL330 core.
> - * @chan: Owner channel of this xfer.
> - */
> -struct s3c_pl330_xfer {
> - void *token;
> - struct list_head node;
> - struct pl330_xfer px;
> - struct s3c_pl330_chan *chan;
> -};
> -
> -/**
> - * struct s3c_pl330_chan - Logical channel to communicate with
> - * a Physical peripheral.
> - * @pl330_chan_id: Token of a hardware channel thread of PL330 DMAC.
> - * NULL if the channel is available to be acquired.
> - * @id: ID of the peripheral that this channel can communicate with.
> - * @options: Options specified by the client.
> - * @sdaddr: Address provided via s3c2410_dma_devconfig.
> - * @node: To attach to the global list of channels.
> - * @lrq: Pointer to the last submitted pl330_req to PL330 core.
> - * @xfer_list: To manage list of xfers enqueued.
> - * @req: Two requests to communicate with the PL330 engine.
> - * @callback_fn: Callback function to the client.
> - * @rqcfg: Channel configuration for the xfers.
> - * @xfer_head: Pointer to the xfer to be next executed.
> - * @dmac: Pointer to the DMAC that manages this channel, NULL if the
> - * channel is available to be acquired.
> - * @client: Client of this channel. NULL if the
> - * channel is available to be acquired.
> - */
> -struct s3c_pl330_chan {
> - void *pl330_chan_id;
> - enum dma_ch id;
> - unsigned int options;
> - unsigned long sdaddr;
> - struct list_head node;
> - struct pl330_req *lrq;
> - struct list_head xfer_list;
> - struct pl330_req req[2];
> - s3c2410_dma_cbfn_t callback_fn;
> - struct pl330_reqcfg rqcfg;
> - struct s3c_pl330_xfer *xfer_head;
> - struct s3c_pl330_dmac *dmac;
> - struct s3c2410_dma_client *client;
> -};
> -
> -/* All DMACs in the platform */
> -static LIST_HEAD(dmac_list);
> -
> -/* All channels to peripherals in the platform */
> -static LIST_HEAD(chan_list);
> -
> -/*
> - * Since we add resources(DMACs and Channels) to the global pool,
> - * we need to guard access to the resources using a global lock
> - */
> -static DEFINE_SPINLOCK(res_lock);
> -
> -/* Returns the channel with ID 'id' in the chan_list */
> -static struct s3c_pl330_chan *id_to_chan(const enum dma_ch id)
> -{
> - struct s3c_pl330_chan *ch;
> -
> - list_for_each_entry(ch, &chan_list, node)
> - if (ch->id == id)
> - return ch;
> -
> - return NULL;
> -}
> -
> -/* Allocate a new channel with ID 'id' and add to chan_list */
> -static void chan_add(const enum dma_ch id)
> -{
> - struct s3c_pl330_chan *ch = id_to_chan(id);
> -
> - /* Return if the channel already exists */
> - if (ch)
> - return;
> -
> - ch = kmalloc(sizeof(*ch), GFP_KERNEL);
> - /* Return silently to work with other channels */
> - if (!ch)
> - return;
> -
> - ch->id = id;
> - ch->dmac = NULL;
> -
> - list_add_tail(&ch->node, &chan_list);
> -}
> -
> -/* If the channel is not yet acquired by any client */
> -static bool chan_free(struct s3c_pl330_chan *ch)
> -{
> - if (!ch)
> - return false;
> -
> - /* Channel points to some DMAC only when it's acquired */
> - return ch->dmac ? false : true;
> -}
> -
> -/*
> - * Returns 0 is peripheral i/f is invalid or not present on the dmac.
> - * Index + 1, otherwise.
> - */
> -static unsigned iface_of_dmac(struct s3c_pl330_dmac *dmac, enum dma_ch ch_id)
> -{
> - enum dma_ch *id = dmac->peri;
> - int i;
> -
> - /* Discount invalid markers */
> - if (ch_id == DMACH_MAX)
> - return 0;
> -
> - for (i = 0; i < PL330_MAX_PERI; i++)
> - if (id[i] == ch_id)
> - return i + 1;
> -
> - return 0;
> -}
> -
> -/* If all channel threads of the DMAC are busy */
> -static inline bool dmac_busy(struct s3c_pl330_dmac *dmac)
> -{
> - struct pl330_info *pi = dmac->pi;
> -
> - return (dmac->busy_chan < pi->pcfg.num_chan) ? false : true;
> -}
> -
> -/*
> - * Returns the number of free channels that
> - * can be handled by this dmac only.
> - */
> -static unsigned ch_onlyby_dmac(struct s3c_pl330_dmac *dmac)
> -{
> - enum dma_ch *id = dmac->peri;
> - struct s3c_pl330_dmac *d;
> - struct s3c_pl330_chan *ch;
> - unsigned found, count = 0;
> - enum dma_ch p;
> - int i;
> -
> - for (i = 0; i < PL330_MAX_PERI; i++) {
> - p = id[i];
> - ch = id_to_chan(p);
> -
> - if (p == DMACH_MAX || !chan_free(ch))
> - continue;
> -
> - found = 0;
> - list_for_each_entry(d, &dmac_list, node) {
> - if (d != dmac && iface_of_dmac(d, ch->id)) {
> - found = 1;
> - break;
> - }
> - }
> - if (!found)
> - count++;
> - }
> -
> - return count;
> -}
> -
> -/*
> - * Measure of suitability of 'dmac' handling 'ch'
> - *
> - * 0 indicates 'dmac' can not handle 'ch' either
> - * because it is not supported by the hardware or
> - * because all dmac channels are currently busy.
> - *
> - * >0 vlaue indicates 'dmac' has the capability.
> - * The bigger the value the more suitable the dmac.
> - */
> -#define MAX_SUIT UINT_MAX
> -#define MIN_SUIT 0
> -
> -static unsigned suitablility(struct s3c_pl330_dmac *dmac,
> - struct s3c_pl330_chan *ch)
> -{
> - struct pl330_info *pi = dmac->pi;
> - enum dma_ch *id = dmac->peri;
> - struct s3c_pl330_dmac *d;
> - unsigned s;
> - int i;
> -
> - s = MIN_SUIT;
> - /* If all the DMAC channel threads are busy */
> - if (dmac_busy(dmac))
> - return s;
> -
> - for (i = 0; i < PL330_MAX_PERI; i++)
> - if (id[i] == ch->id)
> - break;
> -
> - /* If the 'dmac' can't talk to 'ch' */
> - if (i == PL330_MAX_PERI)
> - return s;
> -
> - s = MAX_SUIT;
> - list_for_each_entry(d, &dmac_list, node) {
> - /*
> - * If some other dmac can talk to this
> - * peri and has some channel free.
> - */
> - if (d != dmac && iface_of_dmac(d, ch->id) && !dmac_busy(d)) {
> - s = 0;
> - break;
> - }
> - }
> - if (s)
> - return s;
> -
> - s = 100;
> -
> - /* Good if free chans are more, bad otherwise */
> - s += (pi->pcfg.num_chan - dmac->busy_chan) - ch_onlyby_dmac(dmac);
> -
> - return s;
> -}
> -
> -/* More than one DMAC may have capability to transfer data with the
> - * peripheral. This function assigns most suitable DMAC to manage the
> - * channel and hence communicate with the peripheral.
> - */
> -static struct s3c_pl330_dmac *map_chan_to_dmac(struct s3c_pl330_chan *ch)
> -{
> - struct s3c_pl330_dmac *d, *dmac = NULL;
> - unsigned sn, sl = MIN_SUIT;
> -
> - list_for_each_entry(d, &dmac_list, node) {
> - sn = suitablility(d, ch);
> -
> - if (sn == MAX_SUIT)
> - return d;
> -
> - if (sn > sl)
> - dmac = d;
> - }
> -
> - return dmac;
> -}
> -
> -/* Acquire the channel for peripheral 'id' */
> -static struct s3c_pl330_chan *chan_acquire(const enum dma_ch id)
> -{
> - struct s3c_pl330_chan *ch = id_to_chan(id);
> - struct s3c_pl330_dmac *dmac;
> -
> - /* If the channel doesn't exist or is already acquired */
> - if (!ch || !chan_free(ch)) {
> - ch = NULL;
> - goto acq_exit;
> - }
> -
> - dmac = map_chan_to_dmac(ch);
> - /* If couldn't map */
> - if (!dmac) {
> - ch = NULL;
> - goto acq_exit;
> - }
> -
> - dmac->busy_chan++;
> - ch->dmac = dmac;
> -
> -acq_exit:
> - return ch;
> -}
> -
> -/* Delete xfer from the queue */
> -static inline void del_from_queue(struct s3c_pl330_xfer *xfer)
> -{
> - struct s3c_pl330_xfer *t;
> - struct s3c_pl330_chan *ch;
> - int found;
> -
> - if (!xfer)
> - return;
> -
> - ch = xfer->chan;
> -
> - /* Make sure xfer is in the queue */
> - found = 0;
> - list_for_each_entry(t, &ch->xfer_list, node)
> - if (t == xfer) {
> - found = 1;
> - break;
> - }
> -
> - if (!found)
> - return;
> -
> - /* If xfer is last entry in the queue */
> - if (xfer->node.next == &ch->xfer_list)
> - t = list_entry(ch->xfer_list.next,
> - struct s3c_pl330_xfer, node);
> - else
> - t = list_entry(xfer->node.next,
> - struct s3c_pl330_xfer, node);
> -
> - /* If there was only one node left */
> - if (t == xfer)
> - ch->xfer_head = NULL;
> - else if (ch->xfer_head == xfer)
> - ch->xfer_head = t;
> -
> - list_del(&xfer->node);
> -}
> -
> -/* Provides pointer to the next xfer in the queue.
> - * If CIRCULAR option is set, the list is left intact,
> - * otherwise the xfer is removed from the list.
> - * Forced delete 'pluck' can be set to override the CIRCULAR option.
> - */
> -static struct s3c_pl330_xfer *get_from_queue(struct s3c_pl330_chan *ch,
> - int pluck)
> -{
> - struct s3c_pl330_xfer *xfer = ch->xfer_head;
> -
> - if (!xfer)
> - return NULL;
> -
> - /* If xfer is last entry in the queue */
> - if (xfer->node.next == &ch->xfer_list)
> - ch->xfer_head = list_entry(ch->xfer_list.next,
> - struct s3c_pl330_xfer, node);
> - else
> - ch->xfer_head = list_entry(xfer->node.next,
> - struct s3c_pl330_xfer, node);
> -
> - if (pluck || !(ch->options & S3C2410_DMAF_CIRCULAR))
> - del_from_queue(xfer);
> -
> - return xfer;
> -}
> -
> -static inline void add_to_queue(struct s3c_pl330_chan *ch,
> - struct s3c_pl330_xfer *xfer, int front)
> -{
> - struct pl330_xfer *xt;
> -
> - /* If queue empty */
> - if (ch->xfer_head == NULL)
> - ch->xfer_head = xfer;
> -
> - xt = &ch->xfer_head->px;
> - /* If the head already submitted (CIRCULAR head) */
> - if (ch->options & S3C2410_DMAF_CIRCULAR &&
> - (xt == ch->req[0].x || xt == ch->req[1].x))
> - ch->xfer_head = xfer;
> -
> - /* If this is a resubmission, it should go at the head */
> - if (front) {
> - ch->xfer_head = xfer;
> - list_add(&xfer->node, &ch->xfer_list);
> - } else {
> - list_add_tail(&xfer->node, &ch->xfer_list);
> - }
> -}
> -
> -static inline void _finish_off(struct s3c_pl330_xfer *xfer,
> - enum s3c2410_dma_buffresult res, int ffree)
> -{
> - struct s3c_pl330_chan *ch;
> -
> - if (!xfer)
> - return;
> -
> - ch = xfer->chan;
> -
> - /* Do callback */
> - if (ch->callback_fn)
> - ch->callback_fn(NULL, xfer->token, xfer->px.bytes, res);
> -
> - /* Force Free or if buffer is not needed anymore */
> - if (ffree || !(ch->options & S3C2410_DMAF_CIRCULAR))
> - kmem_cache_free(ch->dmac->kmcache, xfer);
> -}
> -
> -static inline int s3c_pl330_submit(struct s3c_pl330_chan *ch,
> - struct pl330_req *r)
> -{
> - struct s3c_pl330_xfer *xfer;
> - int ret = 0;
> -
> - /* If already submitted */
> - if (r->x)
> - return 0;
> -
> - xfer = get_from_queue(ch, 0);
> - if (xfer) {
> - r->x = &xfer->px;
> -
> - /* Use max bandwidth for M<->M xfers */
> - if (r->rqtype == MEMTOMEM) {
> - struct pl330_info *pi = xfer->chan->dmac->pi;
> - int burst = 1 << ch->rqcfg.brst_size;
> - u32 bytes = r->x->bytes;
> - int bl;
> -
> - bl = pi->pcfg.data_bus_width / 8;
> - bl *= pi->pcfg.data_buf_dep;
> - bl /= burst;
> -
> - /* src/dst_burst_len can't be more than 16 */
> - if (bl > 16)
> - bl = 16;
> -
> - while (bl > 1) {
> - if (!(bytes % (bl * burst)))
> - break;
> - bl--;
> - }
> -
> - ch->rqcfg.brst_len = bl;
> - } else {
> - ch->rqcfg.brst_len = 1;
> - }
> -
> - ret = pl330_submit_req(ch->pl330_chan_id, r);
> -
> - /* If submission was successful */
> - if (!ret) {
> - ch->lrq = r; /* latest submitted req */
> - return 0;
> - }
> -
> - r->x = NULL;
> -
> - /* If both of the PL330 ping-pong buffers filled */
> - if (ret == -EAGAIN) {
> - dev_err(ch->dmac->pi->dev, "%s:%d!\n",
> - __func__, __LINE__);
> - /* Queue back again */
> - add_to_queue(ch, xfer, 1);
> - ret = 0;
> - } else {
> - dev_err(ch->dmac->pi->dev, "%s:%d!\n",
> - __func__, __LINE__);
> - _finish_off(xfer, S3C2410_RES_ERR, 0);
> - }
> - }
> -
> - return ret;
> -}
> -
> -static void s3c_pl330_rq(struct s3c_pl330_chan *ch,
> - struct pl330_req *r, enum pl330_op_err err)
> -{
> - unsigned long flags;
> - struct s3c_pl330_xfer *xfer;
> - struct pl330_xfer *xl = r->x;
> - enum s3c2410_dma_buffresult res;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - r->x = NULL;
> -
> - s3c_pl330_submit(ch, r);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - /* Map result to S3C DMA API */
> - if (err == PL330_ERR_NONE)
> - res = S3C2410_RES_OK;
> - else if (err == PL330_ERR_ABORT)
> - res = S3C2410_RES_ABORT;
> - else
> - res = S3C2410_RES_ERR;
> -
> - /* If last request had some xfer */
> - if (xl) {
> - xfer = container_of(xl, struct s3c_pl330_xfer, px);
> - _finish_off(xfer, res, 0);
> - } else {
> - dev_info(ch->dmac->pi->dev, "%s:%d No Xfer?!\n",
> - __func__, __LINE__);
> - }
> -}
> -
> -static void s3c_pl330_rq0(void *token, enum pl330_op_err err)
> -{
> - struct pl330_req *r = token;
> - struct s3c_pl330_chan *ch = container_of(r,
> - struct s3c_pl330_chan, req[0]);
> - s3c_pl330_rq(ch, r, err);
> -}
> -
> -static void s3c_pl330_rq1(void *token, enum pl330_op_err err)
> -{
> - struct pl330_req *r = token;
> - struct s3c_pl330_chan *ch = container_of(r,
> - struct s3c_pl330_chan, req[1]);
> - s3c_pl330_rq(ch, r, err);
> -}
> -
> -/* Release an acquired channel */
> -static void chan_release(struct s3c_pl330_chan *ch)
> -{
> - struct s3c_pl330_dmac *dmac;
> -
> - if (chan_free(ch))
> - return;
> -
> - dmac = ch->dmac;
> - ch->dmac = NULL;
> - dmac->busy_chan--;
> -}
> -
> -int s3c2410_dma_ctrl(enum dma_ch id, enum s3c2410_chan_op op)
> -{
> - struct s3c_pl330_xfer *xfer;
> - enum pl330_chan_op pl330op;
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int idx, ret;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch)) {
> - ret = -EINVAL;
> - goto ctrl_exit;
> - }
> -
> - switch (op) {
> - case S3C2410_DMAOP_START:
> - /* Make sure both reqs are enqueued */
> - idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> - s3c_pl330_submit(ch, &ch->req[idx]);
> - s3c_pl330_submit(ch, &ch->req[1 - idx]);
> - pl330op = PL330_OP_START;
> - break;
> -
> - case S3C2410_DMAOP_STOP:
> - pl330op = PL330_OP_ABORT;
> - break;
> -
> - case S3C2410_DMAOP_FLUSH:
> - pl330op = PL330_OP_FLUSH;
> - break;
> -
> - case S3C2410_DMAOP_PAUSE:
> - case S3C2410_DMAOP_RESUME:
> - case S3C2410_DMAOP_TIMEOUT:
> - case S3C2410_DMAOP_STARTED:
> - spin_unlock_irqrestore(&res_lock, flags);
> - return 0;
> -
> - default:
> - spin_unlock_irqrestore(&res_lock, flags);
> - return -EINVAL;
> - }
> -
> - ret = pl330_chan_ctrl(ch->pl330_chan_id, pl330op);
> -
> - if (pl330op == PL330_OP_START) {
> - spin_unlock_irqrestore(&res_lock, flags);
> - return ret;
> - }
> -
> - idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> -
> - /* Abort the current xfer */
> - if (ch->req[idx].x) {
> - xfer = container_of(ch->req[idx].x,
> - struct s3c_pl330_xfer, px);
> -
> - /* Drop xfer during FLUSH */
> - if (pl330op == PL330_OP_FLUSH)
> - del_from_queue(xfer);
> -
> - ch->req[idx].x = NULL;
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT,
> - pl330op == PL330_OP_FLUSH ? 1 : 0);
> - spin_lock_irqsave(&res_lock, flags);
> - }
> -
> - /* Flush the whole queue */
> - if (pl330op == PL330_OP_FLUSH) {
> -
> - if (ch->req[1 - idx].x) {
> - xfer = container_of(ch->req[1 - idx].x,
> - struct s3c_pl330_xfer, px);
> -
> - del_from_queue(xfer);
> -
> - ch->req[1 - idx].x = NULL;
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT, 1);
> - spin_lock_irqsave(&res_lock, flags);
> - }
> -
> - /* Finish off the remaining in the queue */
> - xfer = ch->xfer_head;
> - while (xfer) {
> -
> - del_from_queue(xfer);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT, 1);
> - spin_lock_irqsave(&res_lock, flags);
> -
> - xfer = ch->xfer_head;
> - }
> - }
> -
> -ctrl_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_ctrl);
> -
> -int s3c2410_dma_enqueue(enum dma_ch id, void *token,
> - dma_addr_t addr, int size)
> -{
> - struct s3c_pl330_chan *ch;
> - struct s3c_pl330_xfer *xfer;
> - unsigned long flags;
> - int idx, ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - /* Error if invalid or free channel */
> - if (!ch || chan_free(ch)) {
> - ret = -EINVAL;
> - goto enq_exit;
> - }
> -
> - /* Error if size is unaligned */
> - if (ch->rqcfg.brst_size && size % (1 << ch->rqcfg.brst_size)) {
> - ret = -EINVAL;
> - goto enq_exit;
> - }
> -
> - xfer = kmem_cache_alloc(ch->dmac->kmcache, GFP_ATOMIC);
> - if (!xfer) {
> - ret = -ENOMEM;
> - goto enq_exit;
> - }
> -
> - xfer->token = token;
> - xfer->chan = ch;
> - xfer->px.bytes = size;
> - xfer->px.next = NULL; /* Single request */
> -
> - /* For S3C DMA API, direction is always fixed for all xfers */
> - if (ch->req[0].rqtype == MEMTODEV) {
> - xfer->px.src_addr = addr;
> - xfer->px.dst_addr = ch->sdaddr;
> - } else {
> - xfer->px.src_addr = ch->sdaddr;
> - xfer->px.dst_addr = addr;
> - }
> -
> - add_to_queue(ch, xfer, 0);
> -
> - /* Try submitting on either request */
> - idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> -
> - if (!ch->req[idx].x)
> - s3c_pl330_submit(ch, &ch->req[idx]);
> - else
> - s3c_pl330_submit(ch, &ch->req[1 - idx]);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - if (ch->options & S3C2410_DMAF_AUTOSTART)
> - s3c2410_dma_ctrl(id, S3C2410_DMAOP_START);
> -
> - return 0;
> -
> -enq_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_enqueue);
> -
> -int s3c2410_dma_request(enum dma_ch id,
> - struct s3c2410_dma_client *client,
> - void *dev)
> -{
> - struct s3c_pl330_dmac *dmac;
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = chan_acquire(id);
> - if (!ch) {
> - ret = -EBUSY;
> - goto req_exit;
> - }
> -
> - dmac = ch->dmac;
> -
> - ch->pl330_chan_id = pl330_request_channel(dmac->pi);
> - if (!ch->pl330_chan_id) {
> - chan_release(ch);
> - ret = -EBUSY;
> - goto req_exit;
> - }
> -
> - ch->client = client;
> - ch->options = 0; /* Clear any option */
> - ch->callback_fn = NULL; /* Clear any callback */
> - ch->lrq = NULL;
> -
> - ch->rqcfg.brst_size = 2; /* Default word size */
> - ch->rqcfg.swap = SWAP_NO;
> - ch->rqcfg.scctl = SCCTRL0; /* Noncacheable and nonbufferable */
> - ch->rqcfg.dcctl = DCCTRL0; /* Noncacheable and nonbufferable */
> - ch->rqcfg.privileged = 0;
> - ch->rqcfg.insnaccess = 0;
> -
> - /* Set invalid direction */
> - ch->req[0].rqtype = DEVTODEV;
> - ch->req[1].rqtype = ch->req[0].rqtype;
> -
> - ch->req[0].cfg = &ch->rqcfg;
> - ch->req[1].cfg = ch->req[0].cfg;
> -
> - ch->req[0].peri = iface_of_dmac(dmac, id) - 1; /* Original index */
> - ch->req[1].peri = ch->req[0].peri;
> -
> - ch->req[0].token = &ch->req[0];
> - ch->req[0].xfer_cb = s3c_pl330_rq0;
> - ch->req[1].token = &ch->req[1];
> - ch->req[1].xfer_cb = s3c_pl330_rq1;
> -
> - ch->req[0].x = NULL;
> - ch->req[1].x = NULL;
> -
> - /* Reset xfer list */
> - INIT_LIST_HEAD(&ch->xfer_list);
> - ch->xfer_head = NULL;
> -
> -req_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_request);
> -
> -int s3c2410_dma_free(enum dma_ch id, struct s3c2410_dma_client *client)
> -{
> - struct s3c_pl330_chan *ch;
> - struct s3c_pl330_xfer *xfer;
> - unsigned long flags;
> - int ret = 0;
> - unsigned idx;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch))
> - goto free_exit;
> -
> - /* Refuse if someone else wanted to free the channel */
> - if (ch->client != client) {
> - ret = -EBUSY;
> - goto free_exit;
> - }
> -
> - /* Stop any active xfer, Flushe the queue and do callbacks */
> - pl330_chan_ctrl(ch->pl330_chan_id, PL330_OP_FLUSH);
> -
> - /* Abort the submitted requests */
> - idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> -
> - if (ch->req[idx].x) {
> - xfer = container_of(ch->req[idx].x,
> - struct s3c_pl330_xfer, px);
> -
> - ch->req[idx].x = NULL;
> - del_from_queue(xfer);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT, 1);
> - spin_lock_irqsave(&res_lock, flags);
> - }
> -
> - if (ch->req[1 - idx].x) {
> - xfer = container_of(ch->req[1 - idx].x,
> - struct s3c_pl330_xfer, px);
> -
> - ch->req[1 - idx].x = NULL;
> - del_from_queue(xfer);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT, 1);
> - spin_lock_irqsave(&res_lock, flags);
> - }
> -
> - /* Pluck and Abort the queued requests in order */
> - do {
> - xfer = get_from_queue(ch, 1);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> - _finish_off(xfer, S3C2410_RES_ABORT, 1);
> - spin_lock_irqsave(&res_lock, flags);
> - } while (xfer);
> -
> - ch->client = NULL;
> -
> - pl330_release_channel(ch->pl330_chan_id);
> -
> - ch->pl330_chan_id = NULL;
> -
> - chan_release(ch);
> -
> -free_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_free);
> -
> -int s3c2410_dma_config(enum dma_ch id, int xferunit)
> -{
> - struct s3c_pl330_chan *ch;
> - struct pl330_info *pi;
> - unsigned long flags;
> - int i, dbwidth, ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch)) {
> - ret = -EINVAL;
> - goto cfg_exit;
> - }
> -
> - pi = ch->dmac->pi;
> - dbwidth = pi->pcfg.data_bus_width / 8;
> -
> - /* Max size of xfer can be pcfg.data_bus_width */
> - if (xferunit > dbwidth) {
> - ret = -EINVAL;
> - goto cfg_exit;
> - }
> -
> - i = 0;
> - while (xferunit != (1 << i))
> - i++;
> -
> - /* If valid value */
> - if (xferunit == (1 << i))
> - ch->rqcfg.brst_size = i;
> - else
> - ret = -EINVAL;
> -
> -cfg_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_config);
> -
> -/* Options that are supported by this driver */
> -#define S3C_PL330_FLAGS (S3C2410_DMAF_CIRCULAR | S3C2410_DMAF_AUTOSTART)
> -
> -int s3c2410_dma_setflags(enum dma_ch id, unsigned int options)
> -{
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch) || options & ~(S3C_PL330_FLAGS))
> - ret = -EINVAL;
> - else
> - ch->options = options;
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return 0;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_setflags);
> -
> -int s3c2410_dma_set_buffdone_fn(enum dma_ch id, s3c2410_dma_cbfn_t rtn)
> -{
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch))
> - ret = -EINVAL;
> - else
> - ch->callback_fn = rtn;
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
> -
> -int s3c2410_dma_devconfig(enum dma_ch id, enum s3c2410_dmasrc source,
> - unsigned long address)
> -{
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int ret = 0;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - ch = id_to_chan(id);
> -
> - if (!ch || chan_free(ch)) {
> - ret = -EINVAL;
> - goto devcfg_exit;
> - }
> -
> - switch (source) {
> - case S3C2410_DMASRC_HW: /* P->M */
> - ch->req[0].rqtype = DEVTOMEM;
> - ch->req[1].rqtype = DEVTOMEM;
> - ch->rqcfg.src_inc = 0;
> - ch->rqcfg.dst_inc = 1;
> - break;
> - case S3C2410_DMASRC_MEM: /* M->P */
> - ch->req[0].rqtype = MEMTODEV;
> - ch->req[1].rqtype = MEMTODEV;
> - ch->rqcfg.src_inc = 1;
> - ch->rqcfg.dst_inc = 0;
> - break;
> - default:
> - ret = -EINVAL;
> - goto devcfg_exit;
> - }
> -
> - ch->sdaddr = address;
> -
> -devcfg_exit:
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_devconfig);
> -
> -int s3c2410_dma_getposition(enum dma_ch id, dma_addr_t *src, dma_addr_t *dst)
> -{
> - struct s3c_pl330_chan *ch = id_to_chan(id);
> - struct pl330_chanstatus status;
> - int ret;
> -
> - if (!ch || chan_free(ch))
> - return -EINVAL;
> -
> - ret = pl330_chan_status(ch->pl330_chan_id, &status);
> - if (ret < 0)
> - return ret;
> -
> - *src = status.src_addr;
> - *dst = status.dst_addr;
> -
> - return 0;
> -}
> -EXPORT_SYMBOL(s3c2410_dma_getposition);
> -
> -static irqreturn_t pl330_irq_handler(int irq, void *data)
> -{
> - if (pl330_update(data))
> - return IRQ_HANDLED;
> - else
> - return IRQ_NONE;
> -}
> -
> -static int pl330_probe(struct platform_device *pdev)
> -{
> - struct s3c_pl330_dmac *s3c_pl330_dmac;
> - struct s3c_pl330_platdata *pl330pd;
> - struct pl330_info *pl330_info;
> - struct resource *res;
> - int i, ret, irq;
> -
> - pl330pd = pdev->dev.platform_data;
> -
> - /* Can't do without the list of _32_ peripherals */
> - if (!pl330pd || !pl330pd->peri) {
> - dev_err(&pdev->dev, "platform data missing!\n");
> - return -ENODEV;
> - }
> -
> - pl330_info = kzalloc(sizeof(*pl330_info), GFP_KERNEL);
> - if (!pl330_info)
> - return -ENOMEM;
> -
> - pl330_info->pl330_data = NULL;
> - pl330_info->dev = &pdev->dev;
> -
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (!res) {
> - ret = -ENODEV;
> - goto probe_err1;
> - }
> -
> - request_mem_region(res->start, resource_size(res), pdev->name);
> -
> - pl330_info->base = ioremap(res->start, resource_size(res));
> - if (!pl330_info->base) {
> - ret = -ENXIO;
> - goto probe_err2;
> - }
> -
> - irq = platform_get_irq(pdev, 0);
> - if (irq < 0) {
> - ret = irq;
> - goto probe_err3;
> - }
> -
> - ret = request_irq(irq, pl330_irq_handler, 0,
> - dev_name(&pdev->dev), pl330_info);
> - if (ret)
> - goto probe_err4;
> -
> - /* Allocate a new DMAC */
> - s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL);
> - if (!s3c_pl330_dmac) {
> - ret = -ENOMEM;
> - goto probe_err5;
> - }
> -
> - /* Get operation clock and enable it */
> - s3c_pl330_dmac->clk = clk_get(&pdev->dev, "pdma");
> - if (IS_ERR(s3c_pl330_dmac->clk)) {
> - dev_err(&pdev->dev, "Cannot get operation clock.\n");
> - ret = -EINVAL;
> - goto probe_err6;
> - }
> - clk_enable(s3c_pl330_dmac->clk);
> -
> - ret = pl330_add(pl330_info);
> - if (ret)
> - goto probe_err7;
> -
> - /* Hook the info */
> - s3c_pl330_dmac->pi = pl330_info;
> -
> - /* No busy channels */
> - s3c_pl330_dmac->busy_chan = 0;
> -
> - s3c_pl330_dmac->kmcache = kmem_cache_create(dev_name(&pdev->dev),
> - sizeof(struct s3c_pl330_xfer), 0, 0, NULL);
> -
> - if (!s3c_pl330_dmac->kmcache) {
> - ret = -ENOMEM;
> - goto probe_err8;
> - }
> -
> - /* Get the list of peripherals */
> - s3c_pl330_dmac->peri = pl330pd->peri;
> -
> - /* Attach to the list of DMACs */
> - list_add_tail(&s3c_pl330_dmac->node, &dmac_list);
> -
> - /* Create a channel for each peripheral in the DMAC
> - * that is, if it doesn't already exist
> - */
> - for (i = 0; i < PL330_MAX_PERI; i++)
> - if (s3c_pl330_dmac->peri[i] != DMACH_MAX)
> - chan_add(s3c_pl330_dmac->peri[i]);
> -
> - printk(KERN_INFO
> - "Loaded driver for PL330 DMAC-%d %s\n", pdev->id, pdev->name);
> - printk(KERN_INFO
> - "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
> - pl330_info->pcfg.data_buf_dep,
> - pl330_info->pcfg.data_bus_width / 8, pl330_info->pcfg.num_chan,
> - pl330_info->pcfg.num_peri, pl330_info->pcfg.num_events);
> -
> - return 0;
> -
> -probe_err8:
> - pl330_del(pl330_info);
> -probe_err7:
> - clk_disable(s3c_pl330_dmac->clk);
> - clk_put(s3c_pl330_dmac->clk);
> -probe_err6:
> - kfree(s3c_pl330_dmac);
> -probe_err5:
> - free_irq(irq, pl330_info);
> -probe_err4:
> -probe_err3:
> - iounmap(pl330_info->base);
> -probe_err2:
> - release_mem_region(res->start, resource_size(res));
> -probe_err1:
> - kfree(pl330_info);
> -
> - return ret;
> -}
> -
> -static int pl330_remove(struct platform_device *pdev)
> -{
> - struct s3c_pl330_dmac *dmac, *d;
> - struct s3c_pl330_chan *ch;
> - unsigned long flags;
> - int del, found;
> -
> - if (!pdev->dev.platform_data)
> - return -EINVAL;
> -
> - spin_lock_irqsave(&res_lock, flags);
> -
> - found = 0;
> - list_for_each_entry(d, &dmac_list, node)
> - if (d->pi->dev == &pdev->dev) {
> - found = 1;
> - break;
> - }
> -
> - if (!found) {
> - spin_unlock_irqrestore(&res_lock, flags);
> - return 0;
> - }
> -
> - dmac = d;
> -
> - /* Remove all Channels that are managed only by this DMAC */
> - list_for_each_entry(ch, &chan_list, node) {
> -
> - /* Only channels that are handled by this DMAC */
> - if (iface_of_dmac(dmac, ch->id))
> - del = 1;
> - else
> - continue;
> -
> - /* Don't remove if some other DMAC has it too */
> - list_for_each_entry(d, &dmac_list, node)
> - if (d != dmac && iface_of_dmac(d, ch->id)) {
> - del = 0;
> - break;
> - }
> -
> - if (del) {
> - spin_unlock_irqrestore(&res_lock, flags);
> - s3c2410_dma_free(ch->id, ch->client);
> - spin_lock_irqsave(&res_lock, flags);
> - list_del(&ch->node);
> - kfree(ch);
> - }
> - }
> -
> - /* Disable operation clock */
> - clk_disable(dmac->clk);
> - clk_put(dmac->clk);
> -
> - /* Remove the DMAC */
> - list_del(&dmac->node);
> - kfree(dmac);
> -
> - spin_unlock_irqrestore(&res_lock, flags);
> -
> - return 0;
> -}
> -
> -static struct platform_driver pl330_driver = {
> - .driver = {
> - .owner = THIS_MODULE,
> - .name = "s3c-pl330",
> - },
> - .probe = pl330_probe,
> - .remove = pl330_remove,
> -};
> -
> -static int __init pl330_init(void)
> -{
> - return platform_driver_register(&pl330_driver);
> -}
> -module_init(pl330_init);
> -
> -static void __exit pl330_exit(void)
> -{
> - platform_driver_unregister(&pl330_driver);
> - return;
> -}
> -module_exit(pl330_exit);
> -
> -MODULE_AUTHOR("Jaswinder Singh <jassi.brar@xxxxxxxxxxx>");
> -MODULE_DESCRIPTION("Driver for PL330 DMA Controller");
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 25cf327..9a023e6 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -199,6 +199,14 @@ config PL330_DMA
> You need to provide platform specific settings via
> platform_data for a dma-pl330 device.
>
> +config S3C_PL330_DMA
> + bool "S3C DMA API Driver for PL330 DMAC"
> + select DMA_ENGINE
> + select PL330
> + depends on PLAT_SAMSUNG
> + help
> + S3C DMA API Driver for PL330 DMAC.
> +
> config PCH_DMA
> tristate "Intel EG20T PCH / OKI Semi IOH(ML7213/ML7223) DMA support"
> depends on PCI && X86
> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
> index 836095a..6e81b5d 100644
> --- a/drivers/dma/Makefile
> +++ b/drivers/dma/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
> obj-$(CONFIG_PL330_DMA) += pl330.o
> obj-$(CONFIG_PCH_DMA) += pch_dma.o
> obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
> +obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o
> diff --git a/drivers/dma/s3c-pl330.c b/drivers/dma/s3c-pl330.c
> new file mode 100644
> index 0000000..f85638c
> --- /dev/null
> +++ b/drivers/dma/s3c-pl330.c
> @@ -0,0 +1,1244 @@
> +/* linux/arch/arm/plat-samsung/s3c-pl330.c
> + *
> + * Copyright (C) 2010 Samsung Electronics Co. Ltd.
> + * Jaswinder Singh <jassi.brar@xxxxxxxxxxx>
> + *
> + * 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/init.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +
> +#include <asm/hardware/pl330.h>
> +
> +#include <plat/s3c-pl330-pdata.h>
> +
> +/**
> + * struct s3c_pl330_dmac - Logical representation of a PL330 DMAC.
> + * @busy_chan: Number of channels currently busy.
> + * @peri: List of IDs of peripherals this DMAC can work with.
> + * @node: To attach to the global list of DMACs.
> + * @pi: PL330 configuration info for the DMAC.
> + * @kmcache: Pool to quickly allocate xfers for all channels in the dmac.
> + * @clk: Pointer of DMAC operation clock.
> + */
> +struct s3c_pl330_dmac {
> + unsigned busy_chan;
> + enum dma_ch *peri;
> + struct list_head node;
> + struct pl330_info *pi;
> + struct kmem_cache *kmcache;
> + struct clk *clk;
> +};
> +
> +/**
> + * struct s3c_pl330_xfer - A request submitted by S3C DMA clients.
> + * @token: Xfer ID provided by the client.
> + * @node: To attach to the list of xfers on a channel.
> + * @px: Xfer for PL330 core.
> + * @chan: Owner channel of this xfer.
> + */
> +struct s3c_pl330_xfer {
> + void *token;
> + struct list_head node;
> + struct pl330_xfer px;
> + struct s3c_pl330_chan *chan;
> +};
> +
> +/**
> + * struct s3c_pl330_chan - Logical channel to communicate with
> + * a Physical peripheral.
> + * @pl330_chan_id: Token of a hardware channel thread of PL330 DMAC.
> + * NULL if the channel is available to be acquired.
> + * @id: ID of the peripheral that this channel can communicate with.
> + * @options: Options specified by the client.
> + * @sdaddr: Address provided via s3c2410_dma_devconfig.
> + * @node: To attach to the global list of channels.
> + * @lrq: Pointer to the last submitted pl330_req to PL330 core.
> + * @xfer_list: To manage list of xfers enqueued.
> + * @req: Two requests to communicate with the PL330 engine.
> + * @callback_fn: Callback function to the client.
> + * @rqcfg: Channel configuration for the xfers.
> + * @xfer_head: Pointer to the xfer to be next executed.
> + * @dmac: Pointer to the DMAC that manages this channel, NULL if the
> + * channel is available to be acquired.
> + * @client: Client of this channel. NULL if the
> + * channel is available to be acquired.
> + */
> +struct s3c_pl330_chan {
> + void *pl330_chan_id;
> + enum dma_ch id;
> + unsigned int options;
> + unsigned long sdaddr;
> + struct list_head node;
> + struct pl330_req *lrq;
> + struct list_head xfer_list;
> + struct pl330_req req[2];
> + s3c2410_dma_cbfn_t callback_fn;
> + struct pl330_reqcfg rqcfg;
> + struct s3c_pl330_xfer *xfer_head;
> + struct s3c_pl330_dmac *dmac;
> + struct s3c2410_dma_client *client;
> +};
> +
> +/* All DMACs in the platform */
> +static LIST_HEAD(dmac_list);
> +
> +/* All channels to peripherals in the platform */
> +static LIST_HEAD(chan_list);
> +
> +/*
> + * Since we add resources(DMACs and Channels) to the global pool,
> + * we need to guard access to the resources using a global lock
> + */
> +static DEFINE_SPINLOCK(res_lock);
> +
> +/* Returns the channel with ID 'id' in the chan_list */
> +static struct s3c_pl330_chan *id_to_chan(const enum dma_ch id)
> +{
> + struct s3c_pl330_chan *ch;
> +
> + list_for_each_entry(ch, &chan_list, node)
> + if (ch->id == id)
> + return ch;
> +
> + return NULL;
> +}
> +
> +/* Allocate a new channel with ID 'id' and add to chan_list */
> +static void chan_add(const enum dma_ch id)
> +{
> + struct s3c_pl330_chan *ch = id_to_chan(id);
> +
> + /* Return if the channel already exists */
> + if (ch)
> + return;
> +
> + ch = kmalloc(sizeof(*ch), GFP_KERNEL);
> + /* Return silently to work with other channels */
> + if (!ch)
> + return;
> +
> + ch->id = id;
> + ch->dmac = NULL;
> +
> + list_add_tail(&ch->node, &chan_list);
> +}
> +
> +/* If the channel is not yet acquired by any client */
> +static bool chan_free(struct s3c_pl330_chan *ch)
> +{
> + if (!ch)
> + return false;
> +
> + /* Channel points to some DMAC only when it's acquired */
> + return ch->dmac ? false : true;
> +}
> +
> +/*
> + * Returns 0 is peripheral i/f is invalid or not present on the dmac.
> + * Index + 1, otherwise.
> + */
> +static unsigned iface_of_dmac(struct s3c_pl330_dmac *dmac, enum dma_ch ch_id)
> +{
> + enum dma_ch *id = dmac->peri;
> + int i;
> +
> + /* Discount invalid markers */
> + if (ch_id == DMACH_MAX)
> + return 0;
> +
> + for (i = 0; i < PL330_MAX_PERI; i++)
> + if (id[i] == ch_id)
> + return i + 1;
> +
> + return 0;
> +}
> +
> +/* If all channel threads of the DMAC are busy */
> +static inline bool dmac_busy(struct s3c_pl330_dmac *dmac)
> +{
> + struct pl330_info *pi = dmac->pi;
> +
> + return (dmac->busy_chan < pi->pcfg.num_chan) ? false : true;
> +}
> +
> +/*
> + * Returns the number of free channels that
> + * can be handled by this dmac only.
> + */
> +static unsigned ch_onlyby_dmac(struct s3c_pl330_dmac *dmac)
> +{
> + enum dma_ch *id = dmac->peri;
> + struct s3c_pl330_dmac *d;
> + struct s3c_pl330_chan *ch;
> + unsigned found, count = 0;
> + enum dma_ch p;
> + int i;
> +
> + for (i = 0; i < PL330_MAX_PERI; i++) {
> + p = id[i];
> + ch = id_to_chan(p);
> +
> + if (p == DMACH_MAX || !chan_free(ch))
> + continue;
> +
> + found = 0;
> + list_for_each_entry(d, &dmac_list, node) {
> + if (d != dmac && iface_of_dmac(d, ch->id)) {
> + found = 1;
> + break;
> + }
> + }
> + if (!found)
> + count++;
> + }
> +
> + return count;
> +}
> +
> +/*
> + * Measure of suitability of 'dmac' handling 'ch'
> + *
> + * 0 indicates 'dmac' can not handle 'ch' either
> + * because it is not supported by the hardware or
> + * because all dmac channels are currently busy.
> + *
> + * >0 vlaue indicates 'dmac' has the capability.
> + * The bigger the value the more suitable the dmac.
> + */
> +#define MAX_SUIT UINT_MAX
> +#define MIN_SUIT 0
> +
> +static unsigned suitablility(struct s3c_pl330_dmac *dmac,
> + struct s3c_pl330_chan *ch)
> +{
> + struct pl330_info *pi = dmac->pi;
> + enum dma_ch *id = dmac->peri;
> + struct s3c_pl330_dmac *d;
> + unsigned s;
> + int i;
> +
> + s = MIN_SUIT;
> + /* If all the DMAC channel threads are busy */
> + if (dmac_busy(dmac))
> + return s;
> +
> + for (i = 0; i < PL330_MAX_PERI; i++)
> + if (id[i] == ch->id)
> + break;
> +
> + /* If the 'dmac' can't talk to 'ch' */
> + if (i == PL330_MAX_PERI)
> + return s;
> +
> + s = MAX_SUIT;
> + list_for_each_entry(d, &dmac_list, node) {
> + /*
> + * If some other dmac can talk to this
> + * peri and has some channel free.
> + */
> + if (d != dmac && iface_of_dmac(d, ch->id) && !dmac_busy(d)) {
> + s = 0;
> + break;
> + }
> + }
> + if (s)
> + return s;
> +
> + s = 100;
> +
> + /* Good if free chans are more, bad otherwise */
> + s += (pi->pcfg.num_chan - dmac->busy_chan) - ch_onlyby_dmac(dmac);
> +
> + return s;
> +}
> +
> +/* More than one DMAC may have capability to transfer data with the
> + * peripheral. This function assigns most suitable DMAC to manage the
> + * channel and hence communicate with the peripheral.
> + */
> +static struct s3c_pl330_dmac *map_chan_to_dmac(struct s3c_pl330_chan *ch)
> +{
> + struct s3c_pl330_dmac *d, *dmac = NULL;
> + unsigned sn, sl = MIN_SUIT;
> +
> + list_for_each_entry(d, &dmac_list, node) {
> + sn = suitablility(d, ch);
> +
> + if (sn == MAX_SUIT)
> + return d;
> +
> + if (sn > sl)
> + dmac = d;
> + }
> +
> + return dmac;
> +}
> +
> +/* Acquire the channel for peripheral 'id' */
> +static struct s3c_pl330_chan *chan_acquire(const enum dma_ch id)
> +{
> + struct s3c_pl330_chan *ch = id_to_chan(id);
> + struct s3c_pl330_dmac *dmac;
> +
> + /* If the channel doesn't exist or is already acquired */
> + if (!ch || !chan_free(ch)) {
> + ch = NULL;
> + goto acq_exit;
> + }
> +
> + dmac = map_chan_to_dmac(ch);
> + /* If couldn't map */
> + if (!dmac) {
> + ch = NULL;
> + goto acq_exit;
> + }
> +
> + dmac->busy_chan++;
> + ch->dmac = dmac;
> +
> +acq_exit:
> + return ch;
> +}
> +
> +/* Delete xfer from the queue */
> +static inline void del_from_queue(struct s3c_pl330_xfer *xfer)
> +{
> + struct s3c_pl330_xfer *t;
> + struct s3c_pl330_chan *ch;
> + int found;
> +
> + if (!xfer)
> + return;
> +
> + ch = xfer->chan;
> +
> + /* Make sure xfer is in the queue */
> + found = 0;
> + list_for_each_entry(t, &ch->xfer_list, node)
> + if (t == xfer) {
> + found = 1;
> + break;
> + }
> +
> + if (!found)
> + return;
> +
> + /* If xfer is last entry in the queue */
> + if (xfer->node.next == &ch->xfer_list)
> + t = list_entry(ch->xfer_list.next,
> + struct s3c_pl330_xfer, node);
> + else
> + t = list_entry(xfer->node.next,
> + struct s3c_pl330_xfer, node);
> +
> + /* If there was only one node left */
> + if (t == xfer)
> + ch->xfer_head = NULL;
> + else if (ch->xfer_head == xfer)
> + ch->xfer_head = t;
> +
> + list_del(&xfer->node);
> +}
> +
> +/* Provides pointer to the next xfer in the queue.
> + * If CIRCULAR option is set, the list is left intact,
> + * otherwise the xfer is removed from the list.
> + * Forced delete 'pluck' can be set to override the CIRCULAR option.
> + */
> +static struct s3c_pl330_xfer *get_from_queue(struct s3c_pl330_chan *ch,
> + int pluck)
> +{
> + struct s3c_pl330_xfer *xfer = ch->xfer_head;
> +
> + if (!xfer)
> + return NULL;
> +
> + /* If xfer is last entry in the queue */
> + if (xfer->node.next == &ch->xfer_list)
> + ch->xfer_head = list_entry(ch->xfer_list.next,
> + struct s3c_pl330_xfer, node);
> + else
> + ch->xfer_head = list_entry(xfer->node.next,
> + struct s3c_pl330_xfer, node);
> +
> + if (pluck || !(ch->options & S3C2410_DMAF_CIRCULAR))
> + del_from_queue(xfer);
> +
> + return xfer;
> +}
> +
> +static inline void add_to_queue(struct s3c_pl330_chan *ch,
> + struct s3c_pl330_xfer *xfer, int front)
> +{
> + struct pl330_xfer *xt;
> +
> + /* If queue empty */
> + if (ch->xfer_head == NULL)
> + ch->xfer_head = xfer;
> +
> + xt = &ch->xfer_head->px;
> + /* If the head already submitted (CIRCULAR head) */
> + if (ch->options & S3C2410_DMAF_CIRCULAR &&
> + (xt == ch->req[0].x || xt == ch->req[1].x))
> + ch->xfer_head = xfer;
> +
> + /* If this is a resubmission, it should go at the head */
> + if (front) {
> + ch->xfer_head = xfer;
> + list_add(&xfer->node, &ch->xfer_list);
> + } else {
> + list_add_tail(&xfer->node, &ch->xfer_list);
> + }
> +}
> +
> +static inline void _finish_off(struct s3c_pl330_xfer *xfer,
> + enum s3c2410_dma_buffresult res, int ffree)
> +{
> + struct s3c_pl330_chan *ch;
> +
> + if (!xfer)
> + return;
> +
> + ch = xfer->chan;
> +
> + /* Do callback */
> + if (ch->callback_fn)
> + ch->callback_fn(NULL, xfer->token, xfer->px.bytes, res);
> +
> + /* Force Free or if buffer is not needed anymore */
> + if (ffree || !(ch->options & S3C2410_DMAF_CIRCULAR))
> + kmem_cache_free(ch->dmac->kmcache, xfer);
> +}
> +
> +static inline int s3c_pl330_submit(struct s3c_pl330_chan *ch,
> + struct pl330_req *r)
> +{
> + struct s3c_pl330_xfer *xfer;
> + int ret = 0;
> +
> + /* If already submitted */
> + if (r->x)
> + return 0;
> +
> + xfer = get_from_queue(ch, 0);
> + if (xfer) {
> + r->x = &xfer->px;
> +
> + /* Use max bandwidth for M<->M xfers */
> + if (r->rqtype == MEMTOMEM) {
> + struct pl330_info *pi = xfer->chan->dmac->pi;
> + int burst = 1 << ch->rqcfg.brst_size;
> + u32 bytes = r->x->bytes;
> + int bl;
> +
> + bl = pi->pcfg.data_bus_width / 8;
> + bl *= pi->pcfg.data_buf_dep;
> + bl /= burst;
> +
> + /* src/dst_burst_len can't be more than 16 */
> + if (bl > 16)
> + bl = 16;
> +
> + while (bl > 1) {
> + if (!(bytes % (bl * burst)))
> + break;
> + bl--;
> + }
> +
> + ch->rqcfg.brst_len = bl;
> + } else {
> + ch->rqcfg.brst_len = 1;
> + }
> +
> + ret = pl330_submit_req(ch->pl330_chan_id, r);
> +
> + /* If submission was successful */
> + if (!ret) {
> + ch->lrq = r; /* latest submitted req */
> + return 0;
> + }
> +
> + r->x = NULL;
> +
> + /* If both of the PL330 ping-pong buffers filled */
> + if (ret == -EAGAIN) {
> + dev_err(ch->dmac->pi->dev, "%s:%d!\n",
> + __func__, __LINE__);
> + /* Queue back again */
> + add_to_queue(ch, xfer, 1);
> + ret = 0;
> + } else {
> + dev_err(ch->dmac->pi->dev, "%s:%d!\n",
> + __func__, __LINE__);
> + _finish_off(xfer, S3C2410_RES_ERR, 0);
> + }
> + }
> +
> + return ret;
> +}
> +
> +static void s3c_pl330_rq(struct s3c_pl330_chan *ch,
> + struct pl330_req *r, enum pl330_op_err err)
> +{
> + unsigned long flags;
> + struct s3c_pl330_xfer *xfer;
> + struct pl330_xfer *xl = r->x;
> + enum s3c2410_dma_buffresult res;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + r->x = NULL;
> +
> + s3c_pl330_submit(ch, r);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + /* Map result to S3C DMA API */
> + if (err == PL330_ERR_NONE)
> + res = S3C2410_RES_OK;
> + else if (err == PL330_ERR_ABORT)
> + res = S3C2410_RES_ABORT;
> + else
> + res = S3C2410_RES_ERR;
> +
> + /* If last request had some xfer */
> + if (xl) {
> + xfer = container_of(xl, struct s3c_pl330_xfer, px);
> + _finish_off(xfer, res, 0);
> + } else {
> + dev_info(ch->dmac->pi->dev, "%s:%d No Xfer?!\n",
> + __func__, __LINE__);
> + }
> +}
> +
> +static void s3c_pl330_rq0(void *token, enum pl330_op_err err)
> +{
> + struct pl330_req *r = token;
> + struct s3c_pl330_chan *ch = container_of(r,
> + struct s3c_pl330_chan, req[0]);
> + s3c_pl330_rq(ch, r, err);
> +}
> +
> +static void s3c_pl330_rq1(void *token, enum pl330_op_err err)
> +{
> + struct pl330_req *r = token;
> + struct s3c_pl330_chan *ch = container_of(r,
> + struct s3c_pl330_chan, req[1]);
> + s3c_pl330_rq(ch, r, err);
> +}
> +
> +/* Release an acquired channel */
> +static void chan_release(struct s3c_pl330_chan *ch)
> +{
> + struct s3c_pl330_dmac *dmac;
> +
> + if (chan_free(ch))
> + return;
> +
> + dmac = ch->dmac;
> + ch->dmac = NULL;
> + dmac->busy_chan--;
> +}
> +
> +int s3c2410_dma_ctrl(enum dma_ch id, enum s3c2410_chan_op op)
> +{
> + struct s3c_pl330_xfer *xfer;
> + enum pl330_chan_op pl330op;
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int idx, ret;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch)) {
> + ret = -EINVAL;
> + goto ctrl_exit;
> + }
> +
> + switch (op) {
> + case S3C2410_DMAOP_START:
> + /* Make sure both reqs are enqueued */
> + idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> + s3c_pl330_submit(ch, &ch->req[idx]);
> + s3c_pl330_submit(ch, &ch->req[1 - idx]);
> + pl330op = PL330_OP_START;
> + break;
> +
> + case S3C2410_DMAOP_STOP:
> + pl330op = PL330_OP_ABORT;
> + break;
> +
> + case S3C2410_DMAOP_FLUSH:
> + pl330op = PL330_OP_FLUSH;
> + break;
> +
> + case S3C2410_DMAOP_PAUSE:
> + case S3C2410_DMAOP_RESUME:
> + case S3C2410_DMAOP_TIMEOUT:
> + case S3C2410_DMAOP_STARTED:
> + spin_unlock_irqrestore(&res_lock, flags);
> + return 0;
> +
> + default:
> + spin_unlock_irqrestore(&res_lock, flags);
> + return -EINVAL;
> + }
> +
> + ret = pl330_chan_ctrl(ch->pl330_chan_id, pl330op);
> +
> + if (pl330op == PL330_OP_START) {
> + spin_unlock_irqrestore(&res_lock, flags);
> + return ret;
> + }
> +
> + idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> +
> + /* Abort the current xfer */
> + if (ch->req[idx].x) {
> + xfer = container_of(ch->req[idx].x,
> + struct s3c_pl330_xfer, px);
> +
> + /* Drop xfer during FLUSH */
> + if (pl330op == PL330_OP_FLUSH)
> + del_from_queue(xfer);
> +
> + ch->req[idx].x = NULL;
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT,
> + pl330op == PL330_OP_FLUSH ? 1 : 0);
> + spin_lock_irqsave(&res_lock, flags);
> + }
> +
> + /* Flush the whole queue */
> + if (pl330op == PL330_OP_FLUSH) {
> +
> + if (ch->req[1 - idx].x) {
> + xfer = container_of(ch->req[1 - idx].x,
> + struct s3c_pl330_xfer, px);
> +
> + del_from_queue(xfer);
> +
> + ch->req[1 - idx].x = NULL;
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT, 1);
> + spin_lock_irqsave(&res_lock, flags);
> + }
> +
> + /* Finish off the remaining in the queue */
> + xfer = ch->xfer_head;
> + while (xfer) {
> +
> + del_from_queue(xfer);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT, 1);
> + spin_lock_irqsave(&res_lock, flags);
> +
> + xfer = ch->xfer_head;
> + }
> + }
> +
> +ctrl_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_ctrl);
> +
> +int s3c2410_dma_enqueue(enum dma_ch id, void *token,
> + dma_addr_t addr, int size)
> +{
> + struct s3c_pl330_chan *ch;
> + struct s3c_pl330_xfer *xfer;
> + unsigned long flags;
> + int idx, ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + /* Error if invalid or free channel */
> + if (!ch || chan_free(ch)) {
> + ret = -EINVAL;
> + goto enq_exit;
> + }
> +
> + /* Error if size is unaligned */
> + if (ch->rqcfg.brst_size && size % (1 << ch->rqcfg.brst_size)) {
> + ret = -EINVAL;
> + goto enq_exit;
> + }
> +
> + xfer = kmem_cache_alloc(ch->dmac->kmcache, GFP_ATOMIC);
> + if (!xfer) {
> + ret = -ENOMEM;
> + goto enq_exit;
> + }
> +
> + xfer->token = token;
> + xfer->chan = ch;
> + xfer->px.bytes = size;
> + xfer->px.next = NULL; /* Single request */
> +
> + /* For S3C DMA API, direction is always fixed for all xfers */
> + if (ch->req[0].rqtype == MEMTODEV) {
> + xfer->px.src_addr = addr;
> + xfer->px.dst_addr = ch->sdaddr;
> + } else {
> + xfer->px.src_addr = ch->sdaddr;
> + xfer->px.dst_addr = addr;
> + }
> +
> + add_to_queue(ch, xfer, 0);
> +
> + /* Try submitting on either request */
> + idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> +
> + if (!ch->req[idx].x)
> + s3c_pl330_submit(ch, &ch->req[idx]);
> + else
> + s3c_pl330_submit(ch, &ch->req[1 - idx]);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + if (ch->options & S3C2410_DMAF_AUTOSTART)
> + s3c2410_dma_ctrl(id, S3C2410_DMAOP_START);
> +
> + return 0;
> +
> +enq_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_enqueue);
> +
> +int s3c2410_dma_request(enum dma_ch id,
> + struct s3c2410_dma_client *client,
> + void *dev)
> +{
> + struct s3c_pl330_dmac *dmac;
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = chan_acquire(id);
> + if (!ch) {
> + ret = -EBUSY;
> + goto req_exit;
> + }
> +
> + dmac = ch->dmac;
> +
> + ch->pl330_chan_id = pl330_request_channel(dmac->pi);
> + if (!ch->pl330_chan_id) {
> + chan_release(ch);
> + ret = -EBUSY;
> + goto req_exit;
> + }
> +
> + ch->client = client;
> + ch->options = 0; /* Clear any option */
> + ch->callback_fn = NULL; /* Clear any callback */
> + ch->lrq = NULL;
> +
> + ch->rqcfg.brst_size = 2; /* Default word size */
> + ch->rqcfg.swap = SWAP_NO;
> + ch->rqcfg.scctl = SCCTRL0; /* Noncacheable and nonbufferable */
> + ch->rqcfg.dcctl = DCCTRL0; /* Noncacheable and nonbufferable */
> + ch->rqcfg.privileged = 0;
> + ch->rqcfg.insnaccess = 0;
> +
> + /* Set invalid direction */
> + ch->req[0].rqtype = DEVTODEV;
> + ch->req[1].rqtype = ch->req[0].rqtype;
> +
> + ch->req[0].cfg = &ch->rqcfg;
> + ch->req[1].cfg = ch->req[0].cfg;
> +
> + ch->req[0].peri = iface_of_dmac(dmac, id) - 1; /* Original index */
> + ch->req[1].peri = ch->req[0].peri;
> +
> + ch->req[0].token = &ch->req[0];
> + ch->req[0].xfer_cb = s3c_pl330_rq0;
> + ch->req[1].token = &ch->req[1];
> + ch->req[1].xfer_cb = s3c_pl330_rq1;
> +
> + ch->req[0].x = NULL;
> + ch->req[1].x = NULL;
> +
> + /* Reset xfer list */
> + INIT_LIST_HEAD(&ch->xfer_list);
> + ch->xfer_head = NULL;
> +
> +req_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_request);
> +
> +int s3c2410_dma_free(enum dma_ch id, struct s3c2410_dma_client *client)
> +{
> + struct s3c_pl330_chan *ch;
> + struct s3c_pl330_xfer *xfer;
> + unsigned long flags;
> + int ret = 0;
> + unsigned idx;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch))
> + goto free_exit;
> +
> + /* Refuse if someone else wanted to free the channel */
> + if (ch->client != client) {
> + ret = -EBUSY;
> + goto free_exit;
> + }
> +
> + /* Stop any active xfer, Flushe the queue and do callbacks */
> + pl330_chan_ctrl(ch->pl330_chan_id, PL330_OP_FLUSH);
> +
> + /* Abort the submitted requests */
> + idx = (ch->lrq == &ch->req[0]) ? 1 : 0;
> +
> + if (ch->req[idx].x) {
> + xfer = container_of(ch->req[idx].x,
> + struct s3c_pl330_xfer, px);
> +
> + ch->req[idx].x = NULL;
> + del_from_queue(xfer);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT, 1);
> + spin_lock_irqsave(&res_lock, flags);
> + }
> +
> + if (ch->req[1 - idx].x) {
> + xfer = container_of(ch->req[1 - idx].x,
> + struct s3c_pl330_xfer, px);
> +
> + ch->req[1 - idx].x = NULL;
> + del_from_queue(xfer);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT, 1);
> + spin_lock_irqsave(&res_lock, flags);
> + }
> +
> + /* Pluck and Abort the queued requests in order */
> + do {
> + xfer = get_from_queue(ch, 1);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> + _finish_off(xfer, S3C2410_RES_ABORT, 1);
> + spin_lock_irqsave(&res_lock, flags);
> + } while (xfer);
> +
> + ch->client = NULL;
> +
> + pl330_release_channel(ch->pl330_chan_id);
> +
> + ch->pl330_chan_id = NULL;
> +
> + chan_release(ch);
> +
> +free_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_free);
> +
> +int s3c2410_dma_config(enum dma_ch id, int xferunit)
> +{
> + struct s3c_pl330_chan *ch;
> + struct pl330_info *pi;
> + unsigned long flags;
> + int i, dbwidth, ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch)) {
> + ret = -EINVAL;
> + goto cfg_exit;
> + }
> +
> + pi = ch->dmac->pi;
> + dbwidth = pi->pcfg.data_bus_width / 8;
> +
> + /* Max size of xfer can be pcfg.data_bus_width */
> + if (xferunit > dbwidth) {
> + ret = -EINVAL;
> + goto cfg_exit;
> + }
> +
> + i = 0;
> + while (xferunit != (1 << i))
> + i++;
> +
> + /* If valid value */
> + if (xferunit == (1 << i))
> + ch->rqcfg.brst_size = i;
> + else
> + ret = -EINVAL;
> +
> +cfg_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_config);
> +
> +/* Options that are supported by this driver */
> +#define S3C_PL330_FLAGS (S3C2410_DMAF_CIRCULAR | S3C2410_DMAF_AUTOSTART)
> +
> +int s3c2410_dma_setflags(enum dma_ch id, unsigned int options)
> +{
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch) || options & ~(S3C_PL330_FLAGS))
> + ret = -EINVAL;
> + else
> + ch->options = options;
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_setflags);
> +
> +int s3c2410_dma_set_buffdone_fn(enum dma_ch id, s3c2410_dma_cbfn_t rtn)
> +{
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch))
> + ret = -EINVAL;
> + else
> + ch->callback_fn = rtn;
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
> +
> +int s3c2410_dma_devconfig(enum dma_ch id, enum s3c2410_dmasrc source,
> + unsigned long address)
> +{
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int ret = 0;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + ch = id_to_chan(id);
> +
> + if (!ch || chan_free(ch)) {
> + ret = -EINVAL;
> + goto devcfg_exit;
> + }
> +
> + switch (source) {
> + case S3C2410_DMASRC_HW: /* P->M */
> + ch->req[0].rqtype = DEVTOMEM;
> + ch->req[1].rqtype = DEVTOMEM;
> + ch->rqcfg.src_inc = 0;
> + ch->rqcfg.dst_inc = 1;
> + break;
> + case S3C2410_DMASRC_MEM: /* M->P */
> + ch->req[0].rqtype = MEMTODEV;
> + ch->req[1].rqtype = MEMTODEV;
> + ch->rqcfg.src_inc = 1;
> + ch->rqcfg.dst_inc = 0;
> + break;
> + default:
> + ret = -EINVAL;
> + goto devcfg_exit;
> + }
> +
> + ch->sdaddr = address;
> +
> +devcfg_exit:
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_devconfig);
> +
> +int s3c2410_dma_getposition(enum dma_ch id, dma_addr_t *src, dma_addr_t *dst)
> +{
> + struct s3c_pl330_chan *ch = id_to_chan(id);
> + struct pl330_chanstatus status;
> + int ret;
> +
> + if (!ch || chan_free(ch))
> + return -EINVAL;
> +
> + ret = pl330_chan_status(ch->pl330_chan_id, &status);
> + if (ret < 0)
> + return ret;
> +
> + *src = status.src_addr;
> + *dst = status.dst_addr;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(s3c2410_dma_getposition);
> +
> +static irqreturn_t pl330_irq_handler(int irq, void *data)
> +{
> + if (pl330_update(data))
> + return IRQ_HANDLED;
> + else
> + return IRQ_NONE;
> +}
> +
> +static int pl330_probe(struct platform_device *pdev)
> +{
> + struct s3c_pl330_dmac *s3c_pl330_dmac;
> + struct s3c_pl330_platdata *pl330pd;
> + struct pl330_info *pl330_info;
> + struct resource *res;
> + int i, ret, irq;
> +
> + pl330pd = pdev->dev.platform_data;
> +
> + /* Can't do without the list of _32_ peripherals */
> + if (!pl330pd || !pl330pd->peri) {
> + dev_err(&pdev->dev, "platform data missing!\n");
> + return -ENODEV;
> + }
> +
> + pl330_info = kzalloc(sizeof(*pl330_info), GFP_KERNEL);
> + if (!pl330_info)
> + return -ENOMEM;
> +
> + pl330_info->pl330_data = NULL;
> + pl330_info->dev = &pdev->dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + ret = -ENODEV;
> + goto probe_err1;
> + }
> +
> + request_mem_region(res->start, resource_size(res), pdev->name);
> +
> + pl330_info->base = ioremap(res->start, resource_size(res));
> + if (!pl330_info->base) {
> + ret = -ENXIO;
> + goto probe_err2;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + ret = irq;
> + goto probe_err3;
> + }
> +
> + ret = request_irq(irq, pl330_irq_handler, 0,
> + dev_name(&pdev->dev), pl330_info);
> + if (ret)
> + goto probe_err4;
> +
> + /* Allocate a new DMAC */
> + s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL);
> + if (!s3c_pl330_dmac) {
> + ret = -ENOMEM;
> + goto probe_err5;
> + }
> +
> + /* Get operation clock and enable it */
> + s3c_pl330_dmac->clk = clk_get(&pdev->dev, "pdma");
> + if (IS_ERR(s3c_pl330_dmac->clk)) {
> + dev_err(&pdev->dev, "Cannot get operation clock.\n");
> + ret = -EINVAL;
> + goto probe_err6;
> + }
> + clk_enable(s3c_pl330_dmac->clk);
> +
> + ret = pl330_add(pl330_info);
> + if (ret)
> + goto probe_err7;
> +
> + /* Hook the info */
> + s3c_pl330_dmac->pi = pl330_info;
> +
> + /* No busy channels */
> + s3c_pl330_dmac->busy_chan = 0;
> +
> + s3c_pl330_dmac->kmcache = kmem_cache_create(dev_name(&pdev->dev),
> + sizeof(struct s3c_pl330_xfer), 0, 0, NULL);
> +
> + if (!s3c_pl330_dmac->kmcache) {
> + ret = -ENOMEM;
> + goto probe_err8;
> + }
> +
> + /* Get the list of peripherals */
> + s3c_pl330_dmac->peri = pl330pd->peri;
> +
> + /* Attach to the list of DMACs */
> + list_add_tail(&s3c_pl330_dmac->node, &dmac_list);
> +
> + /* Create a channel for each peripheral in the DMAC
> + * that is, if it doesn't already exist
> + */
> + for (i = 0; i < PL330_MAX_PERI; i++)
> + if (s3c_pl330_dmac->peri[i] != DMACH_MAX)
> + chan_add(s3c_pl330_dmac->peri[i]);
> +
> + printk(KERN_INFO
> + "Loaded driver for PL330 DMAC-%d %s\n", pdev->id, pdev->name);
> + printk(KERN_INFO
> + "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
> + pl330_info->pcfg.data_buf_dep,
> + pl330_info->pcfg.data_bus_width / 8, pl330_info->pcfg.num_chan,
> + pl330_info->pcfg.num_peri, pl330_info->pcfg.num_events);
> +
> + return 0;
> +
> +probe_err8:
> + pl330_del(pl330_info);
> +probe_err7:
> + clk_disable(s3c_pl330_dmac->clk);
> + clk_put(s3c_pl330_dmac->clk);
> +probe_err6:
> + kfree(s3c_pl330_dmac);
> +probe_err5:
> + free_irq(irq, pl330_info);
> +probe_err4:
> +probe_err3:
> + iounmap(pl330_info->base);
> +probe_err2:
> + release_mem_region(res->start, resource_size(res));
> +probe_err1:
> + kfree(pl330_info);
> +
> + return ret;
> +}
> +
> +static int pl330_remove(struct platform_device *pdev)
> +{
> + struct s3c_pl330_dmac *dmac, *d;
> + struct s3c_pl330_chan *ch;
> + unsigned long flags;
> + int del, found;
> +
> + if (!pdev->dev.platform_data)
> + return -EINVAL;
> +
> + spin_lock_irqsave(&res_lock, flags);
> +
> + found = 0;
> + list_for_each_entry(d, &dmac_list, node)
> + if (d->pi->dev == &pdev->dev) {
> + found = 1;
> + break;
> + }
> +
> + if (!found) {
> + spin_unlock_irqrestore(&res_lock, flags);
> + return 0;
> + }
> +
> + dmac = d;
> +
> + /* Remove all Channels that are managed only by this DMAC */
> + list_for_each_entry(ch, &chan_list, node) {
> +
> + /* Only channels that are handled by this DMAC */
> + if (iface_of_dmac(dmac, ch->id))
> + del = 1;
> + else
> + continue;
> +
> + /* Don't remove if some other DMAC has it too */
> + list_for_each_entry(d, &dmac_list, node)
> + if (d != dmac && iface_of_dmac(d, ch->id)) {
> + del = 0;
> + break;
> + }
> +
> + if (del) {
> + spin_unlock_irqrestore(&res_lock, flags);
> + s3c2410_dma_free(ch->id, ch->client);
> + spin_lock_irqsave(&res_lock, flags);
> + list_del(&ch->node);
> + kfree(ch);
> + }
> + }
> +
> + /* Disable operation clock */
> + clk_disable(dmac->clk);
> + clk_put(dmac->clk);
> +
> + /* Remove the DMAC */
> + list_del(&dmac->node);
> + kfree(dmac);
> +
> + spin_unlock_irqrestore(&res_lock, flags);
> +
> + return 0;
> +}
> +
> +static struct platform_driver pl330_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "s3c-pl330",
> + },
> + .probe = pl330_probe,
> + .remove = pl330_remove,
> +};
> +
> +static int __init pl330_init(void)
> +{
> + return platform_driver_register(&pl330_driver);
> +}
> +module_init(pl330_init);
> +
> +static void __exit pl330_exit(void)
> +{
> + platform_driver_unregister(&pl330_driver);
> + return;
> +}
> +module_exit(pl330_exit);
> +
> +MODULE_AUTHOR("Jaswinder Singh <jassi.brar@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Driver for PL330 DMA Controller");
> +MODULE_LICENSE("GPL");
> --
> 1.7.2.3
>
> --
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