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Date: Thu, 8 Apr 2010 01:13:05 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: akpm@...ux-foundation.org,
Russell King - ARM Linux <linux@....linux.org.uk>,
Grant Likely <grant.likely@...retlab.ca>,
Dan Williams <dan.j.williams@...el.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
STEricsson_nomadik_linux@...t.st.com, linux-kernel@...r.kernel.org,
Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 06/11] ARM: add generic PrimeCell interface to DMA40 v1
This extends the DMA engine driver for the DMA40 used in the
U8500 platform with the generic PrimeCell interface,
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
This is new in this patch set and applies on top of the
driver queued in Andrew Mortons tree.
---
drivers/dma/ste_dma40.c | 128 +++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 125 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index e4295a2..f86b99f 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
+#include <linux/amba/dma.h>
#include <plat/ste_dma40.h>
@@ -205,6 +206,9 @@ struct d40_chan {
struct d40_def_lcsp log_def;
struct d40_lcla_elem lcla;
struct d40_log_lli_full *lcpa;
+ /* AMBA extensions */
+ dma_addr_t amba_addr;
+ enum dma_data_direction amba_direction;
};
/**
@@ -1830,7 +1834,10 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
lli_max = 1;
if (direction == DMA_FROM_DEVICE) {
- dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
+ if (d40c->amba_addr)
+ dev_addr = d40c->amba_addr;
+ else
+ dev_addr = d40c->base->plat_data->dev_rx[d40c->dma_cfg.src_dev_type];
total_size = d40_log_sg_to_dev(&d40c->lcla,
sgl, sg_len,
&d40d->lli_log,
@@ -1842,7 +1849,10 @@ static int d40_prep_slave_sg_log(struct d40_desc *d40d,
dev_addr, lli_max,
d40c->base->plat_data->llis_per_log);
} else if (direction == DMA_TO_DEVICE) {
- dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
+ if (d40c->amba_addr)
+ dev_addr = d40c->amba_addr;
+ else
+ dev_addr = d40c->base->plat_data->dev_tx[d40c->dma_cfg.dst_dev_type];
total_size = d40_log_sg_to_dev(&d40c->lcla,
sgl, sg_len,
&d40d->lli_log,
@@ -1973,14 +1983,29 @@ static enum dma_status d40_tx_status(struct dma_chan *chan,
struct dma_tx_state *txstate)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
+ void __iomem *active_reg;
dma_cookie_t last_used;
dma_cookie_t last_complete;
+ u32 status;
int ret;
last_complete = d40c->completed;
last_used = chan->cookie;
- ret = dma_async_is_complete(cookie, last_complete, last_used);
+ /* check for pause first */
+ if (d40c->phy_chan->num % 2 == 0)
+ active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
+ else
+ active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
+
+ status = (readl(active_reg) &
+ D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
+ D40_CHAN_POS(d40c->phy_chan->num);
+
+ if (status == D40_DMA_SUSPENDED)
+ ret = DMA_PAUSED;
+ else
+ ret = dma_async_is_complete(cookie, last_complete, last_used);
if (txstate) {
txstate->last = last_complete;
@@ -2026,6 +2051,103 @@ static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
return -ENXIO;
}
+/* PrimeCell DMA extension */
+void dma_set_ambaconfig(struct dma_chan *chan,
+ struct amba_dma_channel_config *config)
+{
+ struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
+ struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
+ enum stedma40_periph_data_width addr_width;
+ int psize;
+
+ switch (config->addr_width) {
+ case 1:
+ addr_width = STEDMA40_BYTE_WIDTH;
+ break;
+ case 2:
+ addr_width = STEDMA40_HALFWORD_WIDTH;
+ break;
+ case 4:
+ addr_width = STEDMA40_WORD_WIDTH;
+ break;
+ case 8:
+ addr_width = STEDMA40_DOUBLEWORD_WIDTH;
+ break;
+ default:
+ dev_err(d40c->base->dev,
+ "illegal peripheral address width requested (%d)\n",
+ config->addr_width);
+ return;
+ }
+
+ if (config->maxburst >= 16)
+ psize = STEDMA40_PSIZE_LOG_16;
+ else if (config->maxburst >= 8)
+ psize = STEDMA40_PSIZE_LOG_8;
+ else if (config->maxburst >= 4)
+ psize = STEDMA40_PSIZE_LOG_4;
+ else
+ psize = STEDMA40_PSIZE_LOG_1;
+
+ if (config->direction == DMA_FROM_DEVICE) {
+ dma_addr_t dev_addr_rx =
+ d40c->base->plat_data->dev_rx[cfg->src_dev_type];
+
+ if (dev_addr_rx)
+ dev_warn(d40c->base->dev,
+ "channel has a pre-wired RX address %08x "
+ "overriding with %08x\n",
+ dev_addr_rx, config->addr);
+ if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
+ dev_warn(d40c->base->dev,
+ "channel was not configured for peripheral "
+ "to memory transfer (%d) overriding\n",
+ cfg->dir);
+ cfg->dir = STEDMA40_PERIPH_TO_MEM;
+ } else if (config->direction == DMA_TO_DEVICE) {
+ dma_addr_t dev_addr_tx =
+ d40c->base->plat_data->dev_tx[cfg->dst_dev_type];
+
+ if (dev_addr_tx)
+ dev_warn(d40c->base->dev,
+ "channel has a pre-wired TX address %08x "
+ "overriding with %08x\n",
+ dev_addr_tx, config->addr);
+ if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
+ dev_warn(d40c->base->dev,
+ "channel was not configured for memory "
+ "to peripheral transfer (%d) overriding\n",
+ cfg->dir);
+ cfg->dir = STEDMA40_MEM_TO_PERIPH;
+ } else {
+ dev_err(d40c->base->dev,
+ "unrecognized channel direction %d\n",
+ config->direction);
+ return;
+ }
+
+ /* Set up all the endpoint configs */
+ cfg->src_info.data_width = addr_width;
+ cfg->src_info.psize = psize;
+ cfg->src_info.endianess = STEDMA40_LITTLE_ENDIAN;
+ cfg->src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
+ cfg->dst_info.data_width = addr_width;
+ cfg->dst_info.psize = psize;
+ cfg->dst_info.endianess = STEDMA40_LITTLE_ENDIAN;
+ cfg->dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL;
+
+ /* These settings will take precedence later */
+ d40c->amba_addr = config->addr;
+ d40c->amba_direction = config->direction;
+ dev_dbg(d40c->base->dev,
+ "configured channel %s for %s, data width %d, "
+ "maxburst %d bytes, LE, no flow control\n",
+ dma_chan_name(chan),
+ (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
+ config->addr_width,
+ config->maxburst);
+}
+
/* Initialization functions */
static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
--
1.6.3.3
--
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