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path: root/drivers/dma/ste_dma40.c
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Diffstat (limited to 'drivers/dma/ste_dma40.c')
-rw-r--r--drivers/dma/ste_dma40.c541
1 files changed, 315 insertions, 226 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 1734feec47b1..5ab5880d5c90 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -17,6 +17,8 @@
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
#include <linux/amba/bus.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_data/dma-ste-dma40.h>
@@ -45,15 +47,63 @@
#define D40_LCLA_LINK_PER_EVENT_GRP 128
#define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
+/* Max number of logical channels per physical channel */
+#define D40_MAX_LOG_CHAN_PER_PHY 32
+
/* Attempts before giving up to trying to get pages that are aligned */
#define MAX_LCLA_ALLOC_ATTEMPTS 256
/* Bit markings for allocation map */
-#define D40_ALLOC_FREE (1 << 31)
-#define D40_ALLOC_PHY (1 << 30)
+#define D40_ALLOC_FREE BIT(31)
+#define D40_ALLOC_PHY BIT(30)
#define D40_ALLOC_LOG_FREE 0
-#define MAX(a, b) (((a) < (b)) ? (b) : (a))
+#define D40_MEMCPY_MAX_CHANS 8
+
+/* Reserved event lines for memcpy only. */
+#define DB8500_DMA_MEMCPY_EV_0 51
+#define DB8500_DMA_MEMCPY_EV_1 56
+#define DB8500_DMA_MEMCPY_EV_2 57
+#define DB8500_DMA_MEMCPY_EV_3 58
+#define DB8500_DMA_MEMCPY_EV_4 59
+#define DB8500_DMA_MEMCPY_EV_5 60
+
+static int dma40_memcpy_channels[] = {
+ DB8500_DMA_MEMCPY_EV_0,
+ DB8500_DMA_MEMCPY_EV_1,
+ DB8500_DMA_MEMCPY_EV_2,
+ DB8500_DMA_MEMCPY_EV_3,
+ DB8500_DMA_MEMCPY_EV_4,
+ DB8500_DMA_MEMCPY_EV_5,
+};
+
+/* Default configuration for physcial memcpy */
+static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
+ .mode = STEDMA40_MODE_PHYSICAL,
+ .dir = DMA_MEM_TO_MEM,
+
+ .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .src_info.psize = STEDMA40_PSIZE_PHY_1,
+ .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+
+ .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .dst_info.psize = STEDMA40_PSIZE_PHY_1,
+ .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+};
+
+/* Default configuration for logical memcpy */
+static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
+ .mode = STEDMA40_MODE_LOGICAL,
+ .dir = DMA_MEM_TO_MEM,
+
+ .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .src_info.psize = STEDMA40_PSIZE_LOG_1,
+ .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+
+ .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .dst_info.psize = STEDMA40_PSIZE_LOG_1,
+ .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+};
/**
* enum 40_command - The different commands and/or statuses.
@@ -171,6 +221,9 @@ static u32 d40_backup_regs_chan[] = {
D40_CHAN_REG_SDLNK,
};
+#define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
+ BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
+
/**
* struct d40_interrupt_lookup - lookup table for interrupt handler
*
@@ -471,6 +524,8 @@ struct d40_gen_dmac {
* @phy_start: Physical memory start of the DMA registers.
* @phy_size: Size of the DMA register map.
* @irq: The IRQ number.
+ * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
+ * transfers).
* @num_phy_chans: The number of physical channels. Read from HW. This
* is the number of available channels for this driver, not counting "Secure
* mode" allocated physical channels.
@@ -514,6 +569,7 @@ struct d40_base {
phys_addr_t phy_start;
resource_size_t phy_size;
int irq;
+ int num_memcpy_chans;
int num_phy_chans;
int num_log_chans;
struct device_dma_parameters dma_parms;
@@ -534,7 +590,7 @@ struct d40_base {
resource_size_t lcpa_size;
struct kmem_cache *desc_slab;
u32 reg_val_backup[BACKUP_REGS_SZ];
- u32 reg_val_backup_v4[MAX(BACKUP_REGS_SZ_V4A, BACKUP_REGS_SZ_V4B)];
+ u32 reg_val_backup_v4[BACKUP_REGS_SZ_MAX];
u32 *reg_val_backup_chan;
u16 gcc_pwr_off_mask;
bool initialized;
@@ -792,7 +848,7 @@ static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
* that uses linked lists.
*/
if (!(chan->phy_chan->use_soft_lli &&
- chan->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM))
+ chan->dma_cfg.dir == DMA_DEV_TO_MEM))
curr_lcla = d40_lcla_alloc_one(chan, desc);
first_lcla = curr_lcla;
@@ -954,20 +1010,21 @@ static int d40_psize_2_burst_size(bool is_log, int psize)
/*
* The dma only supports transmitting packages up to
- * STEDMA40_MAX_SEG_SIZE << data_width. Calculate the total number of
- * dma elements required to send the entire sg list
+ * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
+ *
+ * Calculate the total number of dma elements required to send the entire sg list.
*/
static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
{
int dmalen;
u32 max_w = max(data_width1, data_width2);
u32 min_w = min(data_width1, data_width2);
- u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
+ u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
if (seg_max > STEDMA40_MAX_SEG_SIZE)
- seg_max -= (1 << max_w);
+ seg_max -= max_w;
- if (!IS_ALIGNED(size, 1 << max_w))
+ if (!IS_ALIGNED(size, max_w))
return -EINVAL;
if (size <= seg_max)
@@ -1257,21 +1314,17 @@ static void __d40_config_set_event(struct d40_chan *d40c,
static void d40_config_set_event(struct d40_chan *d40c,
enum d40_events event_type)
{
- /* Enable event line connected to device (or memcpy) */
- if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) ||
- (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH)) {
- u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
+ u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
+ /* Enable event line connected to device (or memcpy) */
+ if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
+ (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SSLNK);
- }
-
- if (d40c->dma_cfg.dir != STEDMA40_PERIPH_TO_MEM) {
- u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
+ if (d40c->dma_cfg.dir != DMA_DEV_TO_MEM)
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SDLNK);
- }
}
static u32 d40_chan_has_events(struct d40_chan *d40c)
@@ -1417,7 +1470,7 @@ static u32 d40_residue(struct d40_chan *d40c)
>> D40_SREG_ELEM_PHY_ECNT_POS;
}
- return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
+ return num_elt * d40c->dma_cfg.dst_info.data_width;
}
static bool d40_tx_is_linked(struct d40_chan *d40c)
@@ -1566,10 +1619,12 @@ static void dma_tc_handle(struct d40_chan *d40c)
return;
}
- if (d40_queue_start(d40c) == NULL)
+ if (d40_queue_start(d40c) == NULL) {
d40c->busy = false;
- pm_runtime_mark_last_busy(d40c->base->dev);
- pm_runtime_put_autosuspend(d40c->base->dev);
+
+ pm_runtime_mark_last_busy(d40c->base->dev);
+ pm_runtime_put_autosuspend(d40c->base->dev);
+ }
d40_desc_remove(d40d);
d40_desc_done(d40c, d40d);
@@ -1691,7 +1746,7 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
}
/* ACK interrupt */
- writel(1 << idx, base->virtbase + il[row].clr);
+ writel(BIT(idx), base->virtbase + il[row].clr);
spin_lock(&d40c->lock);
@@ -1713,8 +1768,6 @@ static int d40_validate_conf(struct d40_chan *d40c,
struct stedma40_chan_cfg *conf)
{
int res = 0;
- u32 dst_event_group = D40_TYPE_TO_GROUP(conf->dst_dev_type);
- u32 src_event_group = D40_TYPE_TO_GROUP(conf->src_dev_type);
bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
if (!conf->dir) {
@@ -1722,48 +1775,14 @@ static int d40_validate_conf(struct d40_chan *d40c,
res = -EINVAL;
}
- if (conf->dst_dev_type != STEDMA40_DEV_DST_MEMORY &&
- d40c->base->plat_data->dev_tx[conf->dst_dev_type] == 0 &&
- d40c->runtime_addr == 0) {
-
- chan_err(d40c, "Invalid TX channel address (%d)\n",
- conf->dst_dev_type);
- res = -EINVAL;
- }
-
- if (conf->src_dev_type != STEDMA40_DEV_SRC_MEMORY &&
- d40c->base->plat_data->dev_rx[conf->src_dev_type] == 0 &&
- d40c->runtime_addr == 0) {
- chan_err(d40c, "Invalid RX channel address (%d)\n",
- conf->src_dev_type);
+ if ((is_log && conf->dev_type > d40c->base->num_log_chans) ||
+ (!is_log && conf->dev_type > d40c->base->num_phy_chans) ||
+ (conf->dev_type < 0)) {
+ chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type);
res = -EINVAL;
}
- if (conf->dir == STEDMA40_MEM_TO_PERIPH &&
- dst_event_group == STEDMA40_DEV_DST_MEMORY) {
- chan_err(d40c, "Invalid dst\n");
- res = -EINVAL;
- }
-
- if (conf->dir == STEDMA40_PERIPH_TO_MEM &&
- src_event_group == STEDMA40_DEV_SRC_MEMORY) {
- chan_err(d40c, "Invalid src\n");
- res = -EINVAL;
- }
-
- if (src_event_group == STEDMA40_DEV_SRC_MEMORY &&
- dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) {
- chan_err(d40c, "No event line\n");
- res = -EINVAL;
- }
-
- if (conf->dir == STEDMA40_PERIPH_TO_PERIPH &&
- (src_event_group != dst_event_group)) {
- chan_err(d40c, "Invalid event group\n");
- res = -EINVAL;
- }
-
- if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) {
+ if (conf->dir == DMA_DEV_TO_DEV) {
/*
* DMAC HW supports it. Will be added to this driver,
* in case any dma client requires it.
@@ -1773,9 +1792,9 @@ static int d40_validate_conf(struct d40_chan *d40c,
}
if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
- (1 << conf->src_info.data_width) !=
+ conf->src_info.data_width !=
d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
- (1 << conf->dst_info.data_width)) {
+ conf->dst_info.data_width) {
/*
* The DMAC hardware only supports
* src (burst x width) == dst (burst x width)
@@ -1817,8 +1836,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
if (phy->allocated_src == D40_ALLOC_FREE)
phy->allocated_src = D40_ALLOC_LOG_FREE;
- if (!(phy->allocated_src & (1 << log_event_line))) {
- phy->allocated_src |= 1 << log_event_line;
+ if (!(phy->allocated_src & BIT(log_event_line))) {
+ phy->allocated_src |= BIT(log_event_line);
goto found;
} else
goto not_found;
@@ -1829,8 +1848,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
if (phy->allocated_dst == D40_ALLOC_FREE)
phy->allocated_dst = D40_ALLOC_LOG_FREE;
- if (!(phy->allocated_dst & (1 << log_event_line))) {
- phy->allocated_dst |= 1 << log_event_line;
+ if (!(phy->allocated_dst & BIT(log_event_line))) {
+ phy->allocated_dst |= BIT(log_event_line);
goto found;
} else
goto not_found;
@@ -1860,11 +1879,11 @@ static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
/* Logical channel */
if (is_src) {
- phy->allocated_src &= ~(1 << log_event_line);
+ phy->allocated_src &= ~BIT(log_event_line);
if (phy->allocated_src == D40_ALLOC_LOG_FREE)
phy->allocated_src = D40_ALLOC_FREE;
} else {
- phy->allocated_dst &= ~(1 << log_event_line);
+ phy->allocated_dst &= ~BIT(log_event_line);
if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
phy->allocated_dst = D40_ALLOC_FREE;
}
@@ -1880,7 +1899,7 @@ out:
static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
{
- int dev_type;
+ int dev_type = d40c->dma_cfg.dev_type;
int event_group;
int event_line;
struct d40_phy_res *phys;
@@ -1894,14 +1913,12 @@ static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
phys = d40c->base->phy_res;
num_phy_chans = d40c->base->num_phy_chans;
- if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
- dev_type = d40c->dma_cfg.src_dev_type;
+ if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
log_num = 2 * dev_type;
is_src = true;
- } else if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
- d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
+ } else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+ d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
/* dst event lines are used for logical memcpy */
- dev_type = d40c->dma_cfg.dst_dev_type;
log_num = 2 * dev_type + 1;
is_src = false;
} else
@@ -1911,7 +1928,7 @@ static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
event_line = D40_TYPE_TO_EVENT(dev_type);
if (!is_log) {
- if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
+ if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
/* Find physical half channel */
if (d40c->dma_cfg.use_fixed_channel) {
i = d40c->dma_cfg.phy_channel;
@@ -2012,14 +2029,23 @@ static int d40_config_memcpy(struct d40_chan *d40c)
dma_cap_mask_t cap = d40c->chan.device->cap_mask;
if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
- d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_log;
- d40c->dma_cfg.src_dev_type = STEDMA40_DEV_SRC_MEMORY;
- d40c->dma_cfg.dst_dev_type = d40c->base->plat_data->
- memcpy[d40c->chan.chan_id];
+ d40c->dma_cfg = dma40_memcpy_conf_log;
+ d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id];
+
+ d40_log_cfg(&d40c->dma_cfg,
+ &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
} else if (dma_has_cap(DMA_MEMCPY, cap) &&
dma_has_cap(DMA_SLAVE, cap)) {
- d40c->dma_cfg = *d40c->base->plat_data->memcpy_conf_phy;
+ d40c->dma_cfg = dma40_memcpy_conf_phy;
+
+ /* Generate interrrupt at end of transfer or relink. */
+ d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS);
+
+ /* Generate interrupt on error. */
+ d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
+ d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
+
} else {
chan_err(d40c, "No memcpy\n");
return -EINVAL;
@@ -2032,7 +2058,7 @@ static int d40_free_dma(struct d40_chan *d40c)
{
int res = 0;
- u32 event;
+ u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
struct d40_phy_res *phy = d40c->phy_chan;
bool is_src;
@@ -2050,14 +2076,12 @@ static int d40_free_dma(struct d40_chan *d40c)
return -EINVAL;
}
- if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
- d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
- event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
+ if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+ d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
is_src = false;
- } else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
- event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
+ else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
is_src = true;
- } else {
+ else {
chan_err(d40c, "Unknown direction\n");
return -EINVAL;
}
@@ -2098,7 +2122,7 @@ static bool d40_is_paused(struct d40_chan *d40c)
unsigned long flags;
void __iomem *active_reg;
u32 status;
- u32 event;
+ u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
spin_lock_irqsave(&d40c->lock, flags);
@@ -2117,12 +2141,10 @@ static bool d40_is_paused(struct d40_chan *d40c)
goto _exit;
}
- if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
- d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
- event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
+ if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
+ d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
status = readl(chanbase + D40_CHAN_REG_SDLNK);
- } else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
- event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
+ } else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
status = readl(chanbase + D40_CHAN_REG_SSLNK);
} else {
chan_err(d40c, "Unknown direction\n");
@@ -2253,24 +2275,6 @@ err:
return NULL;
}
-static dma_addr_t
-d40_get_dev_addr(struct d40_chan *chan, enum dma_transfer_direction direction)
-{
- struct stedma40_platform_data *plat = chan->base->plat_data;
- struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
- dma_addr_t addr = 0;
-
- if (chan->runtime_addr)
- return chan->runtime_addr;
-
- if (direction == DMA_DEV_TO_MEM)
- addr = plat->dev_rx[cfg->src_dev_type];
- else if (direction == DMA_MEM_TO_DEV)
- addr = plat->dev_tx[cfg->dst_dev_type];
-
- return addr;
-}
-
static struct dma_async_tx_descriptor *
d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
struct scatterlist *sg_dst, unsigned int sg_len,
@@ -2297,14 +2301,10 @@ d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
if (sg_next(&sg_src[sg_len - 1]) == sg_src)
desc->cyclic = true;
- if (direction != DMA_TRANS_NONE) {
- dma_addr_t dev_addr = d40_get_dev_addr(chan, direction);
-
- if (direction == DMA_DEV_TO_MEM)
- src_dev_addr = dev_addr;
- else if (direction == DMA_MEM_TO_DEV)
- dst_dev_addr = dev_addr;
- }
+ if (direction == DMA_DEV_TO_MEM)
+ src_dev_addr = chan->runtime_addr;
+ else if (direction == DMA_MEM_TO_DEV)
+ dst_dev_addr = chan->runtime_addr;
if (chan_is_logical(chan))
ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
@@ -2364,7 +2364,7 @@ static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
u32 rtreg;
u32 event = D40_TYPE_TO_EVENT(dev_type);
u32 group = D40_TYPE_TO_GROUP(dev_type);
- u32 bit = 1 << event;
+ u32 bit = BIT(event);
u32 prioreg;
struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
@@ -2395,13 +2395,57 @@ static void d40_set_prio_realtime(struct d40_chan *d40c)
if (d40c->base->rev < 3)
return;
- if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) ||
- (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
- __d40_set_prio_rt(d40c, d40c->dma_cfg.src_dev_type, true);
+ if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
+ (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
+ __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
- if ((d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH) ||
- (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
- __d40_set_prio_rt(d40c, d40c->dma_cfg.dst_dev_type, false);
+ if ((d40c->dma_cfg.dir == DMA_MEM_TO_DEV) ||
+ (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
+ __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
+}
+
+#define D40_DT_FLAGS_MODE(flags) ((flags >> 0) & 0x1)
+#define D40_DT_FLAGS_DIR(flags) ((flags >> 1) & 0x1)
+#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
+#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
+
+static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct stedma40_chan_cfg cfg;
+ dma_cap_mask_t cap;
+ u32 flags;
+
+ memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
+
+ dma_cap_zero(cap);
+ dma_cap_set(DMA_SLAVE, cap);
+
+ cfg.dev_type = dma_spec->args[0];
+ flags = dma_spec->args[2];
+
+ switch (D40_DT_FLAGS_MODE(flags)) {
+ case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
+ case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
+ }
+
+ switch (D40_DT_FLAGS_DIR(flags)) {
+ case 0:
+ cfg.dir = DMA_MEM_TO_DEV;
+ cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
+ break;
+ case 1:
+ cfg.dir = DMA_DEV_TO_MEM;
+ cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
+ break;
+ }
+
+ if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
+ cfg.phy_channel = dma_spec->args[1];
+ cfg.use_fixed_channel = true;
+ }
+
+ return dma_request_channel(cap, stedma40_filter, &cfg);
}
/* DMA ENGINE functions */
@@ -2433,23 +2477,21 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
}
pm_runtime_get_sync(d40c->base->dev);
- /* Fill in basic CFG register values */
- d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
- &d40c->dst_def_cfg, chan_is_logical(d40c));
d40_set_prio_realtime(d40c);
if (chan_is_logical(d40c)) {
- d40_log_cfg(&d40c->dma_cfg,
- &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
-
- if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM)
+ if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
d40c->lcpa = d40c->base->lcpa_base +
- d40c->dma_cfg.src_dev_type * D40_LCPA_CHAN_SIZE;
+ d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
else
d40c->lcpa = d40c->base->lcpa_base +
- d40c->dma_cfg.dst_dev_type *
+ d40c->dma_cfg.dev_type *
D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
+
+ /* Unmask the Global Interrupt Mask. */
+ d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
+ d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
}
dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
@@ -2639,33 +2681,10 @@ static void d40_terminate_all(struct dma_chan *chan)
static int
dma40_config_to_halfchannel(struct d40_chan *d40c,
struct stedma40_half_channel_info *info,
- enum dma_slave_buswidth width,
u32 maxburst)
{
- enum stedma40_periph_data_width addr_width;
int psize;
- switch (width) {
- case DMA_SLAVE_BUSWIDTH_1_BYTE:
- addr_width = STEDMA40_BYTE_WIDTH;
- break;
- case DMA_SLAVE_BUSWIDTH_2_BYTES:
- addr_width = STEDMA40_HALFWORD_WIDTH;
- break;
- case DMA_SLAVE_BUSWIDTH_4_BYTES:
- addr_width = STEDMA40_WORD_WIDTH;
- break;
- case DMA_SLAVE_BUSWIDTH_8_BYTES:
- addr_width = STEDMA40_DOUBLEWORD_WIDTH;
- break;
- default:
- dev_err(d40c->base->dev,
- "illegal peripheral address width "
- "requested (%d)\n",
- width);
- return -EINVAL;
- }
-
if (chan_is_logical(d40c)) {
if (maxburst >= 16)
psize = STEDMA40_PSIZE_LOG_16;
@@ -2686,7 +2705,6 @@ dma40_config_to_halfchannel(struct d40_chan *d40c,
psize = STEDMA40_PSIZE_PHY_1;
}
- info->data_width = addr_width;
info->psize = psize;
info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
@@ -2710,21 +2728,14 @@ static int d40_set_runtime_config(struct dma_chan *chan,
dst_maxburst = config->dst_maxburst;
if (config->direction == DMA_DEV_TO_MEM) {
- dma_addr_t dev_addr_rx =
- d40c->base->plat_data->dev_rx[cfg->src_dev_type];
-
config_addr = config->src_addr;
- if (dev_addr_rx)
- dev_dbg(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)
+
+ if (cfg->dir != DMA_DEV_TO_MEM)
dev_dbg(d40c->base->dev,
"channel was not configured for peripheral "
"to memory transfer (%d) overriding\n",
cfg->dir);
- cfg->dir = STEDMA40_PERIPH_TO_MEM;
+ cfg->dir = DMA_DEV_TO_MEM;
/* Configure the memory side */
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
@@ -2733,21 +2744,14 @@ static int d40_set_runtime_config(struct dma_chan *chan,
dst_maxburst = src_maxburst;
} else if (config->direction == DMA_MEM_TO_DEV) {
- dma_addr_t dev_addr_tx =
- d40c->base->plat_data->dev_tx[cfg->dst_dev_type];
-
config_addr = config->dst_addr;
- if (dev_addr_tx)
- dev_dbg(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)
+
+ if (cfg->dir != DMA_MEM_TO_DEV)
dev_dbg(d40c->base->dev,
"channel was not configured for memory "
"to peripheral transfer (%d) overriding\n",
cfg->dir);
- cfg->dir = STEDMA40_MEM_TO_PERIPH;
+ cfg->dir = DMA_MEM_TO_DEV;
/* Configure the memory side */
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
@@ -2761,6 +2765,11 @@ static int d40_set_runtime_config(struct dma_chan *chan,
return -EINVAL;
}
+ if (config_addr <= 0) {
+ dev_err(d40c->base->dev, "no address supplied\n");
+ return -EINVAL;
+ }
+
if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
dev_err(d40c->base->dev,
"src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
@@ -2779,14 +2788,24 @@ static int d40_set_runtime_config(struct dma_chan *chan,
src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
}
+ /* Only valid widths are; 1, 2, 4 and 8. */
+ if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
+ src_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
+ dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
+ dst_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
+ ((src_addr_width > 1) && (src_addr_width & 1)) ||
+ ((dst_addr_width > 1) && (dst_addr_width & 1)))
+ return -EINVAL;
+
+ cfg->src_info.data_width = src_addr_width;
+ cfg->dst_info.data_width = dst_addr_width;
+
ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
- src_addr_width,
src_maxburst);
if (ret)
return ret;
ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
- dst_addr_width,
dst_maxburst);
if (ret)
return ret;
@@ -2795,8 +2814,7 @@ static int d40_set_runtime_config(struct dma_chan *chan,
if (chan_is_logical(d40c))
d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
else
- d40_phy_cfg(cfg, &d40c->src_def_cfg,
- &d40c->dst_def_cfg, false);
+ d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg);
/* These settings will take precedence later */
d40c->runtime_addr = config_addr;
@@ -2927,7 +2945,7 @@ static int __init d40_dmaengine_init(struct d40_base *base,
}
d40_chan_init(base, &base->dma_memcpy, base->log_chans,
- base->num_log_chans, base->plat_data->memcpy_len);
+ base->num_log_chans, base->num_memcpy_chans);
dma_cap_zero(base->dma_memcpy.cap_mask);
dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
@@ -3121,13 +3139,14 @@ static int __init d40_phy_res_init(struct d40_base *base)
static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
{
- struct stedma40_platform_data *plat_data;
+ struct stedma40_platform_data *plat_data = pdev->dev.platform_data;
struct clk *clk = NULL;
void __iomem *virtbase = NULL;
struct resource *res = NULL;
struct d40_base *base = NULL;
int num_log_chans = 0;
int num_phy_chans;
+ int num_memcpy_chans;
int clk_ret = -EINVAL;
int i;
u32 pid;
@@ -3187,8 +3206,10 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
* DB8540v1 has revision 4
*/
rev = AMBA_REV_BITS(pid);
-
- plat_data = pdev->dev.platform_data;
+ if (rev < 2) {
+ d40_err(&pdev->dev, "hardware revision: %d is not supported", rev);
+ goto failure;
+ }
/* The number of physical channels on this HW */
if (plat_data->num_of_phy_chans)
@@ -3196,26 +3217,20 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
else
num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
- dev_info(&pdev->dev, "hardware revision: %d @ 0x%x with %d physical channels\n",
- rev, res->start, num_phy_chans);
-
- if (rev < 2) {
- d40_err(&pdev->dev, "hardware revision: %d is not supported",
- rev);
- goto failure;
- }
+ /* The number of channels used for memcpy */
+ if (plat_data->num_of_memcpy_chans)
+ num_memcpy_chans = plat_data->num_of_memcpy_chans;
+ else
+ num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
- /* Count the number of logical channels in use */
- for (i = 0; i < plat_data->dev_len; i++)
- if (plat_data->dev_rx[i] != 0)
- num_log_chans++;
+ num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
- for (i = 0; i < plat_data->dev_len; i++)
- if (plat_data->dev_tx[i] != 0)
- num_log_chans++;
+ dev_info(&pdev->dev,
+ "hardware rev: %d @ 0x%x with %d physical and %d logical channels\n",
+ rev, res->start, num_phy_chans, num_log_chans);
base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
- (num_phy_chans + num_log_chans + plat_data->memcpy_len) *
+ (num_phy_chans + num_log_chans + num_memcpy_chans) *
sizeof(struct d40_chan), GFP_KERNEL);
if (base == NULL) {
@@ -3225,6 +3240,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
base->rev = rev;
base->clk = clk;
+ base->num_memcpy_chans = num_memcpy_chans;
base->num_phy_chans = num_phy_chans;
base->num_log_chans = num_log_chans;
base->phy_start = res->start;
@@ -3276,17 +3292,11 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
if (!base->lookup_phy_chans)
goto failure;
- if (num_log_chans + plat_data->memcpy_len) {
- /*
- * The max number of logical channels are event lines for all
- * src devices and dst devices
- */
- base->lookup_log_chans = kzalloc(plat_data->dev_len * 2 *
- sizeof(struct d40_chan *),
- GFP_KERNEL);
- if (!base->lookup_log_chans)
- goto failure;
- }
+ base->lookup_log_chans = kzalloc(num_log_chans *
+ sizeof(struct d40_chan *),
+ GFP_KERNEL);
+ if (!base->lookup_log_chans)
+ goto failure;
base->reg_val_backup_chan = kmalloc(base->num_phy_chans *
sizeof(d40_backup_regs_chan),
@@ -3470,17 +3480,82 @@ failure:
return ret;
}
+static int __init d40_of_probe(struct platform_device *pdev,
+ struct device_node *np)
+{
+ struct stedma40_platform_data *pdata;
+ int num_phy = 0, num_memcpy = 0, num_disabled = 0;
+ const const __be32 *list;
+
+ pdata = devm_kzalloc(&pdev->dev,
+ sizeof(struct stedma40_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ /* If absent this value will be obtained from h/w. */
+ of_property_read_u32(np, "dma-channels", &num_phy);
+ if (num_phy > 0)
+ pdata->num_of_phy_chans = num_phy;
+
+ list = of_get_property(np, "memcpy-channels", &num_memcpy);
+ num_memcpy /= sizeof(*list);
+
+ if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
+ d40_err(&pdev->dev,
+ "Invalid number of memcpy channels specified (%d)\n",
+ num_memcpy);
+ return -EINVAL;
+ }
+ pdata->num_of_memcpy_chans = num_memcpy;
+
+ of_property_read_u32_array(np, "memcpy-channels",
+ dma40_memcpy_channels,
+ num_memcpy);
+
+ list = of_get_property(np, "disabled-channels", &num_disabled);
+ num_disabled /= sizeof(*list);
+
+ if (num_disabled > STEDMA40_MAX_PHYS || num_disabled < 0) {
+ d40_err(&pdev->dev,
+ "Invalid number of disabled channels specified (%d)\n",
+ num_disabled);
+ return -EINVAL;
+ }
+
+ of_property_read_u32_array(np, "disabled-channels",
+ pdata->disabled_channels,
+ num_disabled);
+ pdata->disabled_channels[num_disabled] = -1;
+
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+
static int __init d40_probe(struct platform_device *pdev)
{
- int err;
+ struct stedma40_platform_data *plat_data = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
int ret = -ENOENT;
- struct d40_base *base;
+ struct d40_base *base = NULL;
struct resource *res = NULL;
int num_reserved_chans;
u32 val;
- base = d40_hw_detect_init(pdev);
+ if (!plat_data) {
+ if (np) {
+ if(d40_of_probe(pdev, np)) {
+ ret = -ENOMEM;
+ goto failure;
+ }
+ } else {
+ d40_err(&pdev->dev, "No pdata or Device Tree provided\n");
+ goto failure;
+ }
+ }
+ base = d40_hw_detect_init(pdev);
if (!base)
goto failure;
@@ -3573,6 +3648,7 @@ static int __init d40_probe(struct platform_device *pdev)
base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
if (IS_ERR(base->lcpa_regulator)) {
d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
+ ret = PTR_ERR(base->lcpa_regulator);
base->lcpa_regulator = NULL;
goto failure;
}
@@ -3588,19 +3664,26 @@ static int __init d40_probe(struct platform_device *pdev)
}
base->initialized = true;
- err = d40_dmaengine_init(base, num_reserved_chans);
- if (err)
+ ret = d40_dmaengine_init(base, num_reserved_chans);
+ if (ret)
goto failure;
base->dev->dma_parms = &base->dma_parms;
- err = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
- if (err) {
+ ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
+ if (ret) {
d40_err(&pdev->dev, "Failed to set dma max seg size\n");
goto failure;
}
d40_hw_init(base);
+ if (np) {
+ ret = of_dma_controller_register(np, d40_xlate, NULL);
+ if (ret)
+ dev_err(&pdev->dev,
+ "could not register of_dma_controller\n");
+ }
+
dev_info(base->dev, "initialized\n");
return 0;
@@ -3654,11 +3737,17 @@ failure:
return ret;
}
+static const struct of_device_id d40_match[] = {
+ { .compatible = "stericsson,dma40", },
+ {}
+};
+
static struct platform_driver d40_driver = {
.driver = {
.owner = THIS_MODULE,
.name = D40_NAME,
.pm = DMA40_PM_OPS,
+ .of_match_table = d40_match,
},
};