#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_data/edma.h>
#include "dmaengine.h"
#include "virt-dma.h"
-/*
- * This will go away when the private EDMA API is folded
- * into this driver and the platform device(s) are
- * instantiated in the arch code. We can only get away
- * with this simplification because DA8XX may not be built
- * in the same kernel image with other DaVinci parts. This
- * avoids having to sprinkle dmaengine driver platform devices
- * and data throughout all the existing board files.
- */
-#ifdef CONFIG_ARCH_DAVINCI_DA8XX
-#define EDMA_CTLRS 2
-#define EDMA_CHANS 32
-#else
-#define EDMA_CTLRS 1
-#define EDMA_CHANS 64
-#endif /* CONFIG_ARCH_DAVINCI_DA8XX */
+/* Offsets matching "struct edmacc_param" */
+#define PARM_OPT 0x00
+#define PARM_SRC 0x04
+#define PARM_A_B_CNT 0x08
+#define PARM_DST 0x0c
+#define PARM_SRC_DST_BIDX 0x10
+#define PARM_LINK_BCNTRLD 0x14
+#define PARM_SRC_DST_CIDX 0x18
+#define PARM_CCNT 0x1c
+
+#define PARM_SIZE 0x20
+
+/* Offsets for EDMA CC global channel registers and their shadows */
+#define SH_ER 0x00 /* 64 bits */
+#define SH_ECR 0x08 /* 64 bits */
+#define SH_ESR 0x10 /* 64 bits */
+#define SH_CER 0x18 /* 64 bits */
+#define SH_EER 0x20 /* 64 bits */
+#define SH_EECR 0x28 /* 64 bits */
+#define SH_EESR 0x30 /* 64 bits */
+#define SH_SER 0x38 /* 64 bits */
+#define SH_SECR 0x40 /* 64 bits */
+#define SH_IER 0x50 /* 64 bits */
+#define SH_IECR 0x58 /* 64 bits */
+#define SH_IESR 0x60 /* 64 bits */
+#define SH_IPR 0x68 /* 64 bits */
+#define SH_ICR 0x70 /* 64 bits */
+#define SH_IEVAL 0x78
+#define SH_QER 0x80
+#define SH_QEER 0x84
+#define SH_QEECR 0x88
+#define SH_QEESR 0x8c
+#define SH_QSER 0x90
+#define SH_QSECR 0x94
+#define SH_SIZE 0x200
+
+/* Offsets for EDMA CC global registers */
+#define EDMA_REV 0x0000
+#define EDMA_CCCFG 0x0004
+#define EDMA_QCHMAP 0x0200 /* 8 registers */
+#define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
+#define EDMA_QDMAQNUM 0x0260
+#define EDMA_QUETCMAP 0x0280
+#define EDMA_QUEPRI 0x0284
+#define EDMA_EMR 0x0300 /* 64 bits */
+#define EDMA_EMCR 0x0308 /* 64 bits */
+#define EDMA_QEMR 0x0310
+#define EDMA_QEMCR 0x0314
+#define EDMA_CCERR 0x0318
+#define EDMA_CCERRCLR 0x031c
+#define EDMA_EEVAL 0x0320
+#define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
+#define EDMA_QRAE 0x0380 /* 4 registers */
+#define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
+#define EDMA_QSTAT 0x0600 /* 2 registers */
+#define EDMA_QWMTHRA 0x0620
+#define EDMA_QWMTHRB 0x0624
+#define EDMA_CCSTAT 0x0640
+
+#define EDMA_M 0x1000 /* global channel registers */
+#define EDMA_ECR 0x1008
+#define EDMA_ECRH 0x100C
+#define EDMA_SHADOW0 0x2000 /* 4 shadow regions */
+#define EDMA_PARM 0x4000 /* PaRAM entries */
+
+#define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
+
+#define EDMA_DCHMAP 0x0100 /* 64 registers */
+
+/* CCCFG register */
+#define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
+#define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
+#define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
+#define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
+#define CHMAP_EXIST BIT(24)
/*
* Max of 20 segments per channel to conserve PaRAM slots
#define EDMA_MAX_SLOTS MAX_NR_SG
#define EDMA_DESCRIPTORS 16
+#define EDMA_CHANNEL_ANY -1 /* for edma_alloc_channel() */
+#define EDMA_SLOT_ANY -1 /* for edma_alloc_slot() */
+#define EDMA_CONT_PARAMS_ANY 1001
+#define EDMA_CONT_PARAMS_FIXED_EXACT 1002
+#define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
+
+/* PaRAM slots are laid out like this */
+struct edmacc_param {
+ u32 opt;
+ u32 src;
+ u32 a_b_cnt;
+ u32 dst;
+ u32 src_dst_bidx;
+ u32 link_bcntrld;
+ u32 src_dst_cidx;
+ u32 ccnt;
+} __packed;
+
+/* fields in edmacc_param.opt */
+#define SAM BIT(0)
+#define DAM BIT(1)
+#define SYNCDIM BIT(2)
+#define STATIC BIT(3)
+#define EDMA_FWID (0x07 << 8)
+#define TCCMODE BIT(11)
+#define EDMA_TCC(t) ((t) << 12)
+#define TCINTEN BIT(20)
+#define ITCINTEN BIT(21)
+#define TCCHEN BIT(22)
+#define ITCCHEN BIT(23)
+
+/*ch_status parameter of callback function possible values*/
+#define EDMA_DMA_COMPLETE 1
+#define EDMA_DMA_CC_ERROR 2
+#define EDMA_DMA_TC1_ERROR 3
+#define EDMA_DMA_TC2_ERROR 4
+
struct edma_pset {
u32 len;
dma_addr_t addr;
};
struct edma_cc {
- int ctlr;
+ struct device *dev;
+ struct edma_soc_info *info;
+ void __iomem *base;
+ int id;
+
+ /* eDMA3 resource information */
+ unsigned num_channels;
+ unsigned num_region;
+ unsigned num_slots;
+ unsigned num_tc;
+ enum dma_event_q default_queue;
+
+ bool unused_chan_list_done;
+ /* The edma_inuse bit for each PaRAM slot is clear unless the
+ * channel is in use ... by ARM or DSP, for QDMA, or whatever.
+ */
+ unsigned long *edma_inuse;
+
+ /* The edma_unused bit for each channel is clear unless
+ * it is not being used on this platform. It uses a bit
+ * of SOC-specific initialization code.
+ */
+ unsigned long *edma_unused;
+
+ struct dma_interrupt_data {
+ void (*callback)(unsigned channel, unsigned short ch_status,
+ void *data);
+ void *data;
+ } *intr_data;
+
struct dma_device dma_slave;
- struct edma_chan slave_chans[EDMA_CHANS];
- int num_slave_chans;
+ struct edma_chan *slave_chans;
int dummy_slot;
};
+/* dummy param set used to (re)initialize parameter RAM slots */
+static const struct edmacc_param dummy_paramset = {
+ .link_bcntrld = 0xffff,
+ .ccnt = 1,
+};
+
+static const struct of_device_id edma_of_ids[] = {
+ { .compatible = "ti,edma3", },
+ {}
+};
+
+static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
+{
+ return (unsigned int)__raw_readl(ecc->base + offset);
+}
+
+static inline void edma_write(struct edma_cc *ecc, int offset, int val)
+{
+ __raw_writel(val, ecc->base + offset);
+}
+
+static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
+ unsigned or)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val &= and;
+ val |= or;
+ edma_write(ecc, offset, val);
+}
+
+static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val &= and;
+ edma_write(ecc, offset, val);
+}
+
+static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val |= or;
+ edma_write(ecc, offset, val);
+}
+
+static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
+ int i)
+{
+ return edma_read(ecc, offset + (i << 2));
+}
+
+static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
+ unsigned val)
+{
+ edma_write(ecc, offset + (i << 2), val);
+}
+
+static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
+ unsigned and, unsigned or)
+{
+ edma_modify(ecc, offset + (i << 2), and, or);
+}
+
+static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
+ unsigned or)
+{
+ edma_or(ecc, offset + (i << 2), or);
+}
+
+static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
+ unsigned or)
+{
+ edma_or(ecc, offset + ((i * 2 + j) << 2), or);
+}
+
+static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
+ int j, unsigned val)
+{
+ edma_write(ecc, offset + ((i * 2 + j) << 2), val);
+}
+
+static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
+{
+ return edma_read(ecc, EDMA_SHADOW0 + offset);
+}
+
+static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
+ int offset, int i)
+{
+ return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
+}
+
+static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
+ unsigned val)
+{
+ edma_write(ecc, EDMA_SHADOW0 + offset, val);
+}
+
+static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
+ int i, unsigned val)
+{
+ edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
+}
+
+static inline unsigned int edma_parm_read(struct edma_cc *ecc, int offset,
+ int param_no)
+{
+ return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
+}
+
+static inline void edma_parm_write(struct edma_cc *ecc, int offset,
+ int param_no, unsigned val)
+{
+ edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
+}
+
+static inline void edma_parm_modify(struct edma_cc *ecc, int offset,
+ int param_no, unsigned and, unsigned or)
+{
+ edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
+}
+
+static inline void edma_parm_and(struct edma_cc *ecc, int offset, int param_no,
+ unsigned and)
+{
+ edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
+}
+
+static inline void edma_parm_or(struct edma_cc *ecc, int offset, int param_no,
+ unsigned or)
+{
+ edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
+}
+
+static inline void set_bits(int offset, int len, unsigned long *p)
+{
+ for (; len > 0; len--)
+ set_bit(offset + (len - 1), p);
+}
+
+static inline void clear_bits(int offset, int len, unsigned long *p)
+{
+ for (; len > 0; len--)
+ clear_bit(offset + (len - 1), p);
+}
+
+static void edma_map_dmach_to_queue(struct edma_cc *ecc, unsigned ch_no,
+ enum dma_event_q queue_no)
+{
+ int bit = (ch_no & 0x7) * 4;
+
+ /* default to low priority queue */
+ if (queue_no == EVENTQ_DEFAULT)
+ queue_no = ecc->default_queue;
+
+ queue_no &= 7;
+ edma_modify_array(ecc, EDMA_DMAQNUM, (ch_no >> 3), ~(0x7 << bit),
+ queue_no << bit);
+}
+
+static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
+ int priority)
+{
+ int bit = queue_no * 4;
+
+ edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
+}
+
+static void edma_direct_dmach_to_param_mapping(struct edma_cc *ecc)
+{
+ int i;
+
+ for (i = 0; i < ecc->num_channels; i++)
+ edma_write_array(ecc, EDMA_DCHMAP, i, (i << 5));
+}
+
+static int prepare_unused_channel_list(struct device *dev, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct edma_cc *ecc = data;
+ int dma_req_min = EDMA_CTLR_CHAN(ecc->id, 0);
+ int dma_req_max = dma_req_min + ecc->num_channels;
+ int i, count;
+ struct of_phandle_args dma_spec;
+
+ if (dev->of_node) {
+ struct platform_device *dma_pdev;
+
+ count = of_property_count_strings(dev->of_node, "dma-names");
+ if (count < 0)
+ return 0;
+ for (i = 0; i < count; i++) {
+ if (of_parse_phandle_with_args(dev->of_node, "dmas",
+ "#dma-cells", i,
+ &dma_spec))
+ continue;
+
+ if (!of_match_node(edma_of_ids, dma_spec.np)) {
+ of_node_put(dma_spec.np);
+ continue;
+ }
+
+ dma_pdev = of_find_device_by_node(dma_spec.np);
+ if (&dma_pdev->dev != ecc->dev)
+ continue;
+
+ clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]),
+ ecc->edma_unused);
+ of_node_put(dma_spec.np);
+ }
+ return 0;
+ }
+
+ /* For non-OF case */
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *res = &pdev->resource[i];
+ int dma_req;
+
+ if (!(res->flags & IORESOURCE_DMA))
+ continue;
+
+ dma_req = (int)res->start;
+ if (dma_req >= dma_req_min && dma_req < dma_req_max)
+ clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
+ ecc->edma_unused);
+ }
+
+ return 0;
+}
+
+static void edma_setup_interrupt(struct edma_cc *ecc, unsigned lch,
+ void (*callback)(unsigned channel, u16 ch_status, void *data),
+ void *data)
+{
+ lch = EDMA_CHAN_SLOT(lch);
+
+ if (!callback)
+ edma_shadow0_write_array(ecc, SH_IECR, lch >> 5,
+ BIT(lch & 0x1f));
+
+ ecc->intr_data[lch].callback = callback;
+ ecc->intr_data[lch].data = data;
+
+ if (callback) {
+ edma_shadow0_write_array(ecc, SH_ICR, lch >> 5,
+ BIT(lch & 0x1f));
+ edma_shadow0_write_array(ecc, SH_IESR, lch >> 5,
+ BIT(lch & 0x1f));
+ }
+}
+
+/*
+ * paRAM management functions
+ */
+
+/**
+ * edma_write_slot - write parameter RAM data for slot
+ * @ecc: pointer to edma_cc struct
+ * @slot: number of parameter RAM slot being modified
+ * @param: data to be written into parameter RAM slot
+ *
+ * Use this to assign all parameters of a transfer at once. This
+ * allows more efficient setup of transfers than issuing multiple
+ * calls to set up those parameters in small pieces, and provides
+ * complete control over all transfer options.
+ */
+static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
+ const struct edmacc_param *param)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot >= ecc->num_slots)
+ return;
+ memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
+}
+
+/**
+ * edma_read_slot - read parameter RAM data from slot
+ * @ecc: pointer to edma_cc struct
+ * @slot: number of parameter RAM slot being copied
+ * @param: where to store copy of parameter RAM data
+ *
+ * Use this to read data from a parameter RAM slot, perhaps to
+ * save them as a template for later reuse.
+ */
+static void edma_read_slot(struct edma_cc *ecc, unsigned slot,
+ struct edmacc_param *param)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot >= ecc->num_slots)
+ return;
+ memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
+}
+
+/**
+ * edma_alloc_slot - allocate DMA parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @slot: specific slot to allocate; negative for "any unused slot"
+ *
+ * This allocates a parameter RAM slot, initializing it to hold a
+ * dummy transfer. Slots allocated using this routine have not been
+ * mapped to a hardware DMA channel, and will normally be used by
+ * linking to them from a slot associated with a DMA channel.
+ *
+ * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
+ * slots may be allocated on behalf of DSP firmware.
+ *
+ * Returns the number of the slot, else negative errno.
+ */
+static int edma_alloc_slot(struct edma_cc *ecc, int slot)
+{
+ if (slot > 0)
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot < 0) {
+ slot = ecc->num_channels;
+ for (;;) {
+ slot = find_next_zero_bit(ecc->edma_inuse,
+ ecc->num_slots,
+ slot);
+ if (slot == ecc->num_slots)
+ return -ENOMEM;
+ if (!test_and_set_bit(slot, ecc->edma_inuse))
+ break;
+ }
+ } else if (slot < ecc->num_channels || slot >= ecc->num_slots) {
+ return -EINVAL;
+ } else if (test_and_set_bit(slot, ecc->edma_inuse)) {
+ return -EBUSY;
+ }
+
+ edma_write_slot(ecc, slot, &dummy_paramset);
+
+ return EDMA_CTLR_CHAN(ecc->id, slot);
+}
+
+/**
+ * edma_free_slot - deallocate DMA parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @slot: parameter RAM slot returned from edma_alloc_slot()
+ *
+ * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
+ * Callers are responsible for ensuring the slot is inactive, and will
+ * not be activated.
+ */
+static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot < ecc->num_channels || slot >= ecc->num_slots)
+ return;
+
+ edma_write_slot(ecc, slot, &dummy_paramset);
+ clear_bit(slot, ecc->edma_inuse);
+}
+
+/**
+ * edma_link - link one parameter RAM slot to another
+ * @ecc: pointer to edma_cc struct
+ * @from: parameter RAM slot originating the link
+ * @to: parameter RAM slot which is the link target
+ *
+ * The originating slot should not be part of any active DMA transfer.
+ */
+static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
+{
+ from = EDMA_CHAN_SLOT(from);
+ to = EDMA_CHAN_SLOT(to);
+ if (from >= ecc->num_slots || to >= ecc->num_slots)
+ return;
+
+ edma_parm_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
+ PARM_OFFSET(to));
+}
+
+/**
+ * edma_get_position - returns the current transfer point
+ * @ecc: pointer to edma_cc struct
+ * @slot: parameter RAM slot being examined
+ * @dst: true selects the dest position, false the source
+ *
+ * Returns the position of the current active slot
+ */
+static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
+ bool dst)
+{
+ u32 offs;
+
+ slot = EDMA_CHAN_SLOT(slot);
+ offs = PARM_OFFSET(slot);
+ offs += dst ? PARM_DST : PARM_SRC;
+
+ return edma_read(ecc, offs);
+}
+
+/*-----------------------------------------------------------------------*/
+/**
+ * edma_start - start dma on a channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: channel being activated
+ *
+ * Channels with event associations will be triggered by their hardware
+ * events, and channels without such associations will be triggered by
+ * software. (At this writing there is no interface for using software
+ * triggers except with channels that don't support hardware triggers.)
+ *
+ * Returns zero on success, else negative errno.
+ */
+static int edma_start(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = channel >> 5;
+ unsigned int mask = BIT(channel & 0x1f);
+
+ /* EDMA channels without event association */
+ if (test_bit(channel, ecc->edma_unused)) {
+ dev_dbg(ecc->dev, "ESR%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_ESR, j));
+ edma_shadow0_write_array(ecc, SH_ESR, j, mask);
+ return 0;
+ }
+
+ /* EDMA channel with event association */
+ dev_dbg(ecc->dev, "ER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_ER, j));
+ /* Clear any pending event or error */
+ edma_write_array(ecc, EDMA_ECR, j, mask);
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_EESR, j, mask);
+ dev_dbg(ecc->dev, "EER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_EER, j));
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * edma_stop - stops dma on the channel passed
+ * @ecc: pointer to edma_cc struct
+ * @channel: channel being deactivated
+ *
+ * When @lch is a channel, any active transfer is paused and
+ * all pending hardware events are cleared. The current transfer
+ * may not be resumed, and the channel's Parameter RAM should be
+ * reinitialized before being reused.
+ */
+static void edma_stop(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = channel >> 5;
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_ECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+
+ /* clear possibly pending completion interrupt */
+ edma_shadow0_write_array(ecc, SH_ICR, j, mask);
+
+ dev_dbg(ecc->dev, "EER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_EER, j));
+
+ /* REVISIT: consider guarding against inappropriate event
+ * chaining by overwriting with dummy_paramset.
+ */
+ }
+}
+
+/**
+ * edma_pause - pause dma on a channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: on which edma_start() has been called
+ *
+ * This temporarily disables EDMA hardware events on the specified channel,
+ * preventing them from triggering new transfers on its behalf
+ */
+static void edma_pause(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EECR, channel >> 5, mask);
+ }
+}
+
+/**
+ * edma_resume - resumes dma on a paused channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: on which edma_pause() has been called
+ *
+ * This re-enables EDMA hardware events on the specified channel.
+ */
+static void edma_resume(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EESR, channel >> 5, mask);
+ }
+}
+
+static int edma_trigger_channel(struct edma_cc *ecc, unsigned channel)
+{
+ unsigned int mask;
+
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+ mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
+
+ dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
+ edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
+ return 0;
+}
+
+/******************************************************************************
+ *
+ * It cleans ParamEntry qand bring back EDMA to initial state if media has
+ * been removed before EDMA has finished.It is usedful for removable media.
+ * Arguments:
+ * ch_no - channel no
+ *
+ * Return: zero on success, or corresponding error no on failure
+ *
+ * FIXME this should not be needed ... edma_stop() should suffice.
+ *
+ *****************************************************************************/
+
+static void edma_clean_channel(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = (channel >> 5);
+ unsigned int mask = BIT(channel & 0x1f);
+
+ dev_dbg(ecc->dev, "EMR%d %08x\n", j,
+ edma_read_array(ecc, EDMA_EMR, j));
+ edma_shadow0_write_array(ecc, SH_ECR, j, mask);
+ /* Clear the corresponding EMR bits */
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
+ }
+}
+
+/**
+ * edma_alloc_channel - allocate DMA channel and paired parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @channel: specific channel to allocate; negative for "any unmapped channel"
+ * @callback: optional; to be issued on DMA completion or errors
+ * @data: passed to callback
+ * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
+ * Controller (TC) executes requests using this channel. Use
+ * EVENTQ_DEFAULT unless you really need a high priority queue.
+ *
+ * This allocates a DMA channel and its associated parameter RAM slot.
+ * The parameter RAM is initialized to hold a dummy transfer.
+ *
+ * Normal use is to pass a specific channel number as @channel, to make
+ * use of hardware events mapped to that channel. When the channel will
+ * be used only for software triggering or event chaining, channels not
+ * mapped to hardware events (or mapped to unused events) are preferable.
+ *
+ * DMA transfers start from a channel using edma_start(), or by
+ * chaining. When the transfer described in that channel's parameter RAM
+ * slot completes, that slot's data may be reloaded through a link.
+ *
+ * DMA errors are only reported to the @callback associated with the
+ * channel driving that transfer, but transfer completion callbacks can
+ * be sent to another channel under control of the TCC field in
+ * the option word of the transfer's parameter RAM set. Drivers must not
+ * use DMA transfer completion callbacks for channels they did not allocate.
+ * (The same applies to TCC codes used in transfer chaining.)
+ *
+ * Returns the number of the channel, else negative errno.
+ */
+static int edma_alloc_channel(struct edma_cc *ecc, int channel,
+ void (*callback)(unsigned channel, u16 ch_status, void *data),
+ void *data,
+ enum dma_event_q eventq_no)
+{
+ unsigned done = 0;
+ int ret = 0;
+
+ if (!ecc->unused_chan_list_done) {
+ /*
+ * Scan all the platform devices to find out the EDMA channels
+ * used and clear them in the unused list, making the rest
+ * available for ARM usage.
+ */
+ ret = bus_for_each_dev(&platform_bus_type, NULL, ecc,
+ prepare_unused_channel_list);
+ if (ret < 0)
+ return ret;
+
+ ecc->unused_chan_list_done = true;
+ }
+
+ if (channel >= 0) {
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n",
+ __func__, ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+ }
+
+ if (channel < 0) {
+ channel = 0;
+ for (;;) {
+ channel = find_next_bit(ecc->edma_unused,
+ ecc->num_channels, channel);
+ if (channel == ecc->num_channels)
+ break;
+ if (!test_and_set_bit(channel, ecc->edma_inuse)) {
+ done = 1;
+ break;
+ }
+ channel++;
+ }
+ if (!done)
+ return -ENOMEM;
+ } else if (channel >= ecc->num_channels) {
+ return -EINVAL;
+ } else if (test_and_set_bit(channel, ecc->edma_inuse)) {
+ return -EBUSY;
+ }
+
+ /* ensure access through shadow region 0 */
+ edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
+
+ /* ensure no events are pending */
+ edma_stop(ecc, EDMA_CTLR_CHAN(ecc->id, channel));
+ edma_write_slot(ecc, channel, &dummy_paramset);
+
+ if (callback)
+ edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, channel),
+ callback, data);
+
+ edma_map_dmach_to_queue(ecc, channel, eventq_no);
+
+ return EDMA_CTLR_CHAN(ecc->id, channel);
+}
+
+/**
+ * edma_free_channel - deallocate DMA channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: dma channel returned from edma_alloc_channel()
+ *
+ * This deallocates the DMA channel and associated parameter RAM slot
+ * allocated by edma_alloc_channel().
+ *
+ * Callers are responsible for ensuring the channel is inactive, and
+ * will not be reactivated by linking, chaining, or software calls to
+ * edma_start().
+ */
+static void edma_free_channel(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel >= ecc->num_channels)
+ return;
+
+ edma_setup_interrupt(ecc, channel, NULL, NULL);
+ /* REVISIT should probably take out of shadow region 0 */
+
+ edma_write_slot(ecc, channel, &dummy_paramset);
+ clear_bit(channel, ecc->edma_inuse);
+}
+
+/*
+ * edma_assign_channel_eventq - move given channel to desired eventq
+ * Arguments:
+ * channel - channel number
+ * eventq_no - queue to move the channel
+ *
+ * Can be used to move a channel to a selected event queue.
+ */
+static void edma_assign_channel_eventq(struct edma_cc *ecc, unsigned channel,
+ enum dma_event_q eventq_no)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel >= ecc->num_channels)
+ return;
+
+ /* default to low priority queue */
+ if (eventq_no == EVENTQ_DEFAULT)
+ eventq_no = ecc->default_queue;
+ if (eventq_no >= ecc->num_tc)
+ return;
+
+ edma_map_dmach_to_queue(ecc, channel, eventq_no);
+}
+
+static irqreturn_t dma_irq_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int ctlr;
+ u32 sh_ier;
+ u32 sh_ipr;
+ u32 bank;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_irq_handler\n");
+
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
+ if (!sh_ipr) {
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
+ if (!sh_ipr)
+ return IRQ_NONE;
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
+ bank = 1;
+ } else {
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
+ bank = 0;
+ }
+
+ do {
+ u32 slot;
+ u32 channel;
+
+ dev_dbg(ecc->dev, "IPR%d %08x\n", bank, sh_ipr);
+
+ slot = __ffs(sh_ipr);
+ sh_ipr &= ~(BIT(slot));
+
+ if (sh_ier & BIT(slot)) {
+ channel = (bank << 5) | slot;
+ /* Clear the corresponding IPR bits */
+ edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
+ if (ecc->intr_data[channel].callback)
+ ecc->intr_data[channel].callback(
+ EDMA_CTLR_CHAN(ctlr, channel),
+ EDMA_DMA_COMPLETE,
+ ecc->intr_data[channel].data);
+ }
+ } while (sh_ipr);
+
+ edma_shadow0_write(ecc, SH_IEVAL, 1);
+ return IRQ_HANDLED;
+}
+
+/******************************************************************************
+ *
+ * DMA error interrupt handler
+ *
+ *****************************************************************************/
+static irqreturn_t dma_ccerr_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int i;
+ int ctlr;
+ unsigned int cnt = 0;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_ccerr_handler\n");
+
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ return IRQ_NONE;
+
+ while (1) {
+ int j = -1;
+
+ if (edma_read_array(ecc, EDMA_EMR, 0))
+ j = 0;
+ else if (edma_read_array(ecc, EDMA_EMR, 1))
+ j = 1;
+ if (j >= 0) {
+ dev_dbg(ecc->dev, "EMR%d %08x\n", j,
+ edma_read_array(ecc, EDMA_EMR, j));
+ for (i = 0; i < 32; i++) {
+ int k = (j << 5) + i;
+
+ if (edma_read_array(ecc, EDMA_EMR, j) &
+ BIT(i)) {
+ /* Clear the corresponding EMR bits */
+ edma_write_array(ecc, EDMA_EMCR, j,
+ BIT(i));
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR,
+ j, BIT(i));
+ if (ecc->intr_data[k].callback) {
+ ecc->intr_data[k].callback(
+ EDMA_CTLR_CHAN(ctlr, k),
+ EDMA_DMA_CC_ERROR,
+ ecc->intr_data[k].data);
+ }
+ }
+ }
+ } else if (edma_read(ecc, EDMA_QEMR)) {
+ dev_dbg(ecc->dev, "QEMR %02x\n",
+ edma_read(ecc, EDMA_QEMR));
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_QEMR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_QEMCR, BIT(i));
+ edma_shadow0_write(ecc, SH_QSECR,
+ BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
+ } else if (edma_read(ecc, EDMA_CCERR)) {
+ dev_dbg(ecc->dev, "CCERR %08x\n",
+ edma_read(ecc, EDMA_CCERR));
+ /* FIXME: CCERR.BIT(16) ignored! much better
+ * to just write CCERRCLR with CCERR value...
+ */
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_CCERR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_CCERRCLR, BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
+ }
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ break;
+ cnt++;
+ if (cnt > 10)
+ break;
+ }
+ edma_write(ecc, EDMA_EEVAL, 1);
+ return IRQ_HANDLED;
+}
+
static inline struct edma_cc *to_edma_cc(struct dma_device *d)
{
return container_of(d, struct edma_cc, dma_slave);
return container_of(c, struct edma_chan, vchan.chan);
}
-static inline struct edma_desc
-*to_edma_desc(struct dma_async_tx_descriptor *tx)
+static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct edma_desc, vdesc.tx);
}
/* Dispatch a queued descriptor to the controller (caller holds lock) */
static void edma_execute(struct edma_chan *echan)
{
+ struct edma_cc *ecc = echan->ecc;
struct virt_dma_desc *vdesc;
struct edma_desc *edesc;
struct device *dev = echan->vchan.chan.device->dev;
int i, j, left, nslots;
- /* If either we processed all psets or we're still not started */
- if (!echan->edesc ||
- echan->edesc->pset_nr == echan->edesc->processed) {
- /* Get next vdesc */
+ if (!echan->edesc) {
+ /* Setup is needed for the first transfer */
vdesc = vchan_next_desc(&echan->vchan);
- if (!vdesc) {
- echan->edesc = NULL;
+ if (!vdesc)
return;
- }
list_del(&vdesc->node);
echan->edesc = to_edma_desc(&vdesc->tx);
}
/* Write descriptor PaRAM set(s) */
for (i = 0; i < nslots; i++) {
j = i + edesc->processed;
- edma_write_slot(echan->slot[i], &edesc->pset[j].param);
+ edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
edesc->sg_len += edesc->pset[j].len;
- dev_vdbg(echan->vchan.chan.device->dev,
- "\n pset[%d]:\n"
- " chnum\t%d\n"
- " slot\t%d\n"
- " opt\t%08x\n"
- " src\t%08x\n"
- " dst\t%08x\n"
- " abcnt\t%08x\n"
- " ccnt\t%08x\n"
- " bidx\t%08x\n"
- " cidx\t%08x\n"
- " lkrld\t%08x\n",
- j, echan->ch_num, echan->slot[i],
- edesc->pset[j].param.opt,
- edesc->pset[j].param.src,
- edesc->pset[j].param.dst,
- edesc->pset[j].param.a_b_cnt,
- edesc->pset[j].param.ccnt,
- edesc->pset[j].param.src_dst_bidx,
- edesc->pset[j].param.src_dst_cidx,
- edesc->pset[j].param.link_bcntrld);
+ dev_vdbg(dev,
+ "\n pset[%d]:\n"
+ " chnum\t%d\n"
+ " slot\t%d\n"
+ " opt\t%08x\n"
+ " src\t%08x\n"
+ " dst\t%08x\n"
+ " abcnt\t%08x\n"
+ " ccnt\t%08x\n"
+ " bidx\t%08x\n"
+ " cidx\t%08x\n"
+ " lkrld\t%08x\n",
+ j, echan->ch_num, echan->slot[i],
+ edesc->pset[j].param.opt,
+ edesc->pset[j].param.src,
+ edesc->pset[j].param.dst,
+ edesc->pset[j].param.a_b_cnt,
+ edesc->pset[j].param.ccnt,
+ edesc->pset[j].param.src_dst_bidx,
+ edesc->pset[j].param.src_dst_cidx,
+ edesc->pset[j].param.link_bcntrld);
/* Link to the previous slot if not the last set */
if (i != (nslots - 1))
- edma_link(echan->slot[i], echan->slot[i+1]);
+ edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
}
edesc->processed += nslots;
*/
if (edesc->processed == edesc->pset_nr) {
if (edesc->cyclic)
- edma_link(echan->slot[nslots-1], echan->slot[1]);
+ edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
else
- edma_link(echan->slot[nslots-1],
+ edma_link(ecc, echan->slot[nslots - 1],
echan->ecc->dummy_slot);
}
- if (edesc->processed <= MAX_NR_SG) {
+ if (echan->missed) {
+ /*
+ * This happens due to setup times between intermediate
+ * transfers in long SG lists which have to be broken up into
+ * transfers of MAX_NR_SG
+ */
+ dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
+ edma_clean_channel(ecc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
+ edma_trigger_channel(ecc, echan->ch_num);
+ echan->missed = 0;
+ } else if (edesc->processed <= MAX_NR_SG) {
dev_dbg(dev, "first transfer starting on channel %d\n",
echan->ch_num);
- edma_start(echan->ch_num);
+ edma_start(ecc, echan->ch_num);
} else {
dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
echan->ch_num, edesc->processed);
- edma_resume(echan->ch_num);
- }
-
- /*
- * This happens due to setup times between intermediate transfers
- * in long SG lists which have to be broken up into transfers of
- * MAX_NR_SG
- */
- if (echan->missed) {
- dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
- edma_clean_channel(echan->ch_num);
- edma_stop(echan->ch_num);
- edma_start(echan->ch_num);
- edma_trigger_channel(echan->ch_num);
- echan->missed = 0;
+ edma_resume(ecc, echan->ch_num);
}
}
* echan->edesc is NULL and exit.)
*/
if (echan->edesc) {
- int cyclic = echan->edesc->cyclic;
-
+ edma_stop(echan->ecc, echan->ch_num);
+ /* Move the cyclic channel back to default queue */
+ if (echan->edesc->cyclic)
+ edma_assign_channel_eventq(echan->ecc, echan->ch_num,
+ EVENTQ_DEFAULT);
/*
* free the running request descriptor
* since it is not in any of the vdesc lists
*/
edma_desc_free(&echan->edesc->vdesc);
-
echan->edesc = NULL;
- edma_stop(echan->ch_num);
- /* Move the cyclic channel back to default queue */
- if (cyclic)
- edma_assign_channel_eventq(echan->ch_num,
- EVENTQ_DEFAULT);
}
vchan_get_all_descriptors(&echan->vchan, &head);
if (!echan->edesc)
return -EINVAL;
- edma_pause(echan->ch_num);
+ edma_pause(echan->ecc, echan->ch_num);
return 0;
}
{
struct edma_chan *echan = to_edma_chan(chan);
- edma_resume(echan->ch_num);
+ edma_resume(echan->ecc, echan->ch_num);
return 0;
}
* @direction: Direction of the transfer
*/
static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
- dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
- enum dma_slave_buswidth dev_width, unsigned int dma_length,
- enum dma_transfer_direction direction)
+ dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
+ enum dma_slave_buswidth dev_width,
+ unsigned int dma_length,
+ enum dma_transfer_direction direction)
{
struct edma_chan *echan = to_edma_chan(chan);
struct device *dev = chan->device->dev;
return NULL;
}
- edesc = kzalloc(sizeof(*edesc) + sg_len *
- sizeof(edesc->pset[0]), GFP_ATOMIC);
+ edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
+ GFP_ATOMIC);
if (!edesc) {
dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
return NULL;
for (i = 0; i < nslots; i++) {
if (echan->slot[i] < 0) {
echan->slot[i] =
- edma_alloc_slot(EDMA_CTLR(echan->ch_num),
- EDMA_SLOT_ANY);
+ edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
if (echan->slot[i] < 0) {
kfree(edesc);
dev_err(dev, "%s: Failed to allocate slot\n",
if (nslots > MAX_NR_SG)
return NULL;
- edesc = kzalloc(sizeof(*edesc) + nslots *
- sizeof(edesc->pset[0]), GFP_ATOMIC);
+ edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
+ GFP_ATOMIC);
if (!edesc) {
dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
return NULL;
/* Allocate a PaRAM slot, if needed */
if (echan->slot[i] < 0) {
echan->slot[i] =
- edma_alloc_slot(EDMA_CTLR(echan->ch_num),
- EDMA_SLOT_ANY);
+ edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
if (echan->slot[i] < 0) {
kfree(edesc);
dev_err(dev, "%s: Failed to allocate slot\n",
}
/* Place the cyclic channel to highest priority queue */
- edma_assign_channel_eventq(echan->ch_num, EVENTQ_0);
+ edma_assign_channel_eventq(echan->ecc, echan->ch_num, EVENTQ_0);
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}
static void edma_callback(unsigned ch_num, u16 ch_status, void *data)
{
struct edma_chan *echan = data;
+ struct edma_cc *ecc = echan->ecc;
struct device *dev = echan->vchan.chan.device->dev;
struct edma_desc *edesc;
struct edmacc_param p;
edesc = echan->edesc;
- /* Pause the channel for non-cyclic */
- if (!edesc || (edesc && !edesc->cyclic))
- edma_pause(echan->ch_num);
-
+ spin_lock(&echan->vchan.lock);
switch (ch_status) {
case EDMA_DMA_COMPLETE:
- spin_lock(&echan->vchan.lock);
-
if (edesc) {
if (edesc->cyclic) {
vchan_cyclic_callback(&edesc->vdesc);
+ goto out;
} else if (edesc->processed == edesc->pset_nr) {
- dev_dbg(dev, "Transfer complete, stopping channel %d\n", ch_num);
+ dev_dbg(dev,
+ "Transfer completed on channel %d\n",
+ ch_num);
edesc->residue = 0;
- edma_stop(echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
vchan_cookie_complete(&edesc->vdesc);
- edma_execute(echan);
+ echan->edesc = NULL;
} else {
- dev_dbg(dev, "Intermediate transfer complete on channel %d\n", ch_num);
+ dev_dbg(dev,
+ "Sub transfer completed on channel %d\n",
+ ch_num);
+
+ edma_pause(ecc, echan->ch_num);
/* Update statistics for tx_status */
edesc->residue -= edesc->sg_len;
edesc->residue_stat = edesc->residue;
edesc->processed_stat = edesc->processed;
-
- edma_execute(echan);
}
+ edma_execute(echan);
}
-
- spin_unlock(&echan->vchan.lock);
-
break;
case EDMA_DMA_CC_ERROR:
- spin_lock(&echan->vchan.lock);
-
- edma_read_slot(EDMA_CHAN_SLOT(echan->slot[0]), &p);
+ edma_read_slot(ecc, echan->slot[0], &p);
/*
* Issue later based on missed flag which will be sure
* slot. So we avoid doing so and set the missed flag.
*/
if (p.a_b_cnt == 0 && p.ccnt == 0) {
- dev_dbg(dev, "Error occurred, looks like slot is null, just setting miss\n");
+ dev_dbg(dev, "Error on null slot, setting miss\n");
echan->missed = 1;
} else {
/*
* The slot is already programmed but the event got
* missed, so its safe to issue it here.
*/
- dev_dbg(dev, "Error occurred but slot is non-null, TRIGGERING\n");
- edma_clean_channel(echan->ch_num);
- edma_stop(echan->ch_num);
- edma_start(echan->ch_num);
- edma_trigger_channel(echan->ch_num);
+ dev_dbg(dev, "Missed event, TRIGGERING\n");
+ edma_clean_channel(ecc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
+ edma_trigger_channel(ecc, echan->ch_num);
}
-
- spin_unlock(&echan->vchan.lock);
-
break;
default:
break;
}
+out:
+ spin_unlock(&echan->vchan.lock);
}
/* Alloc channel resources */
int a_ch_num;
LIST_HEAD(descs);
- a_ch_num = edma_alloc_channel(echan->ch_num, edma_callback,
- echan, EVENTQ_DEFAULT);
+ a_ch_num = edma_alloc_channel(echan->ecc, echan->ch_num,
+ edma_callback, echan, EVENTQ_DEFAULT);
if (a_ch_num < 0) {
ret = -ENODEV;
return 0;
err_wrong_chan:
- edma_free_channel(a_ch_num);
+ edma_free_channel(echan->ecc, a_ch_num);
err_no_chan:
return ret;
}
static void edma_free_chan_resources(struct dma_chan *chan)
{
struct edma_chan *echan = to_edma_chan(chan);
- struct device *dev = chan->device->dev;
int i;
/* Terminate transfers */
- edma_stop(echan->ch_num);
+ edma_stop(echan->ecc, echan->ch_num);
vchan_free_chan_resources(&echan->vchan);
/* Free EDMA PaRAM slots */
for (i = 1; i < EDMA_MAX_SLOTS; i++) {
if (echan->slot[i] >= 0) {
- edma_free_slot(echan->slot[i]);
+ edma_free_slot(echan->ecc, echan->slot[i]);
echan->slot[i] = -1;
}
}
/* Free EDMA channel */
if (echan->alloced) {
- edma_free_channel(echan->ch_num);
+ edma_free_channel(echan->ecc, echan->ch_num);
echan->alloced = false;
}
- dev_dbg(dev, "freeing channel for %u\n", echan->ch_num);
+ dev_dbg(chan->device->dev, "freeing channel for %u\n", echan->ch_num);
}
/* Send pending descriptor to hardware */
* We always read the dst/src position from the first RamPar
* pset. That's the one which is active now.
*/
- pos = edma_get_position(edesc->echan->slot[0], dst);
+ pos = edma_get_position(edesc->echan->ecc, edesc->echan->slot[0], dst);
/*
* Cyclic is simple. Just subtract pset[0].addr from pos.
return ret;
}
-static void __init edma_chan_init(struct edma_cc *ecc,
- struct dma_device *dma,
+static void __init edma_chan_init(struct edma_cc *ecc, struct dma_device *dma,
struct edma_chan *echans)
{
int i, j;
- for (i = 0; i < EDMA_CHANS; i++) {
+ for (i = 0; i < ecc->num_channels; i++) {
struct edma_chan *echan = &echans[i];
- echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i);
+ echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
echan->ecc = ecc;
echan->vchan.desc_free = edma_desc_free;
INIT_LIST_HEAD(&dma->channels);
}
+static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
+ struct edma_cc *ecc)
+{
+ int i;
+ u32 value, cccfg;
+ s8 (*queue_priority_map)[2];
+
+ /* Decode the eDMA3 configuration from CCCFG register */
+ cccfg = edma_read(ecc, EDMA_CCCFG);
+
+ value = GET_NUM_REGN(cccfg);
+ ecc->num_region = BIT(value);
+
+ value = GET_NUM_DMACH(cccfg);
+ ecc->num_channels = BIT(value + 1);
+
+ value = GET_NUM_PAENTRY(cccfg);
+ ecc->num_slots = BIT(value + 4);
+
+ value = GET_NUM_EVQUE(cccfg);
+ ecc->num_tc = value + 1;
+
+ dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
+ dev_dbg(dev, "num_region: %u\n", ecc->num_region);
+ dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
+ dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
+ dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
+
+ /* Nothing need to be done if queue priority is provided */
+ if (pdata->queue_priority_mapping)
+ return 0;
+
+ /*
+ * Configure TC/queue priority as follows:
+ * Q0 - priority 0
+ * Q1 - priority 1
+ * Q2 - priority 2
+ * ...
+ * The meaning of priority numbers: 0 highest priority, 7 lowest
+ * priority. So Q0 is the highest priority queue and the last queue has
+ * the lowest priority.
+ */
+ queue_priority_map = devm_kcalloc(dev, ecc->num_tc + 1, sizeof(s8),
+ GFP_KERNEL);
+ if (!queue_priority_map)
+ return -ENOMEM;
+
+ for (i = 0; i < ecc->num_tc; i++) {
+ queue_priority_map[i][0] = i;
+ queue_priority_map[i][1] = i;
+ }
+ queue_priority_map[i][0] = -1;
+ queue_priority_map[i][1] = -1;
+
+ pdata->queue_priority_mapping = queue_priority_map;
+ /* Default queue has the lowest priority */
+ pdata->default_queue = i - 1;
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
+ size_t sz)
+{
+ const char pname[] = "ti,edma-xbar-event-map";
+ struct resource res;
+ void __iomem *xbar;
+ s16 (*xbar_chans)[2];
+ size_t nelm = sz / sizeof(s16);
+ u32 shift, offset, mux;
+ int ret, i;
+
+ xbar_chans = devm_kcalloc(dev, nelm + 2, sizeof(s16), GFP_KERNEL);
+ if (!xbar_chans)
+ return -ENOMEM;
+
+ ret = of_address_to_resource(dev->of_node, 1, &res);
+ if (ret)
+ return -ENOMEM;
+
+ xbar = devm_ioremap(dev, res.start, resource_size(&res));
+ if (!xbar)
+ return -ENOMEM;
+
+ ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
+ nelm);
+ if (ret)
+ return -EIO;
+
+ /* Invalidate last entry for the other user of this mess */
+ nelm >>= 1;
+ xbar_chans[nelm][0] = -1;
+ xbar_chans[nelm][1] = -1;
+
+ for (i = 0; i < nelm; i++) {
+ shift = (xbar_chans[i][1] & 0x03) << 3;
+ offset = xbar_chans[i][1] & 0xfffffffc;
+ mux = readl(xbar + offset);
+ mux &= ~(0xff << shift);
+ mux |= xbar_chans[i][0] << shift;
+ writel(mux, (xbar + offset));
+ }
+
+ pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
+ return 0;
+}
+
+static int edma_of_parse_dt(struct device *dev, struct edma_soc_info *pdata)
+{
+ int ret = 0;
+ struct property *prop;
+ size_t sz;
+ struct edma_rsv_info *rsv_info;
+
+ rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
+ if (!rsv_info)
+ return -ENOMEM;
+ pdata->rsv = rsv_info;
+
+ prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map", &sz);
+ if (prop)
+ ret = edma_xbar_event_map(dev, pdata, sz);
+
+ return ret;
+}
+
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev)
+{
+ struct edma_soc_info *info;
+ int ret;
+
+ info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ ret = edma_of_parse_dt(dev, info);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return info;
+}
+#else
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev)
+{
+ return ERR_PTR(-EINVAL);
+}
+#endif
+
static int edma_probe(struct platform_device *pdev)
{
- struct edma_cc *ecc;
+ struct edma_soc_info *info = pdev->dev.platform_data;
+ s8 (*queue_priority_mapping)[2];
+ int i, off, ln;
+ const s16 (*rsv_chans)[2];
+ const s16 (*rsv_slots)[2];
+ const s16 (*xbar_chans)[2];
+ int irq;
+ char *irq_name;
+ struct resource *mem;
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct edma_cc *ecc;
int ret;
- ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (node) {
+ info = edma_setup_info_from_dt(dev);
+ if (IS_ERR(info)) {
+ dev_err(dev, "failed to get DT data\n");
+ return PTR_ERR(info);
+ }
+ }
+
+ if (!info)
+ return -ENODEV;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync() failed\n");
+ return ret;
+ }
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret)
return ret;
- ecc = devm_kzalloc(&pdev->dev, sizeof(*ecc), GFP_KERNEL);
+ ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
if (!ecc) {
- dev_err(&pdev->dev, "Can't allocate controller\n");
+ dev_err(dev, "Can't allocate controller\n");
+ return -ENOMEM;
+ }
+
+ ecc->dev = dev;
+ ecc->id = pdev->id;
+ /* When booting with DT the pdev->id is -1 */
+ if (ecc->id < 0)
+ ecc->id = 0;
+
+ mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
+ if (!mem) {
+ dev_dbg(dev, "mem resource not found, using index 0\n");
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(dev, "no mem resource?\n");
+ return -ENODEV;
+ }
+ }
+ ecc->base = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(ecc->base))
+ return PTR_ERR(ecc->base);
+
+ platform_set_drvdata(pdev, ecc);
+
+ /* Get eDMA3 configuration from IP */
+ ret = edma_setup_from_hw(dev, info, ecc);
+ if (ret)
+ return ret;
+
+ /* Allocate memory based on the information we got from the IP */
+ ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
+ sizeof(*ecc->slave_chans), GFP_KERNEL);
+ if (!ecc->slave_chans)
+ return -ENOMEM;
+
+ ecc->intr_data = devm_kcalloc(dev, ecc->num_channels,
+ sizeof(*ecc->intr_data), GFP_KERNEL);
+ if (!ecc->intr_data)
return -ENOMEM;
+
+ ecc->edma_unused = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_channels),
+ sizeof(unsigned long), GFP_KERNEL);
+ if (!ecc->edma_unused)
+ return -ENOMEM;
+
+ ecc->edma_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
+ sizeof(unsigned long), GFP_KERNEL);
+ if (!ecc->edma_inuse)
+ return -ENOMEM;
+
+ ecc->default_queue = info->default_queue;
+
+ for (i = 0; i < ecc->num_slots; i++)
+ edma_write_slot(ecc, i, &dummy_paramset);
+
+ /* Mark all channels as unused */
+ memset(ecc->edma_unused, 0xff, sizeof(ecc->edma_unused));
+
+ if (info->rsv) {
+ /* Clear the reserved channels in unused list */
+ rsv_chans = info->rsv->rsv_chans;
+ if (rsv_chans) {
+ for (i = 0; rsv_chans[i][0] != -1; i++) {
+ off = rsv_chans[i][0];
+ ln = rsv_chans[i][1];
+ clear_bits(off, ln, ecc->edma_unused);
+ }
+ }
+
+ /* Set the reserved slots in inuse list */
+ rsv_slots = info->rsv->rsv_slots;
+ if (rsv_slots) {
+ for (i = 0; rsv_slots[i][0] != -1; i++) {
+ off = rsv_slots[i][0];
+ ln = rsv_slots[i][1];
+ set_bits(off, ln, ecc->edma_inuse);
+ }
+ }
}
- ecc->ctlr = pdev->id;
- ecc->dummy_slot = edma_alloc_slot(ecc->ctlr, EDMA_SLOT_ANY);
+ /* Clear the xbar mapped channels in unused list */
+ xbar_chans = info->xbar_chans;
+ if (xbar_chans) {
+ for (i = 0; xbar_chans[i][1] != -1; i++) {
+ off = xbar_chans[i][1];
+ clear_bits(off, 1, ecc->edma_unused);
+ }
+ }
+
+ irq = platform_get_irq_byname(pdev, "edma3_ccint");
+ if (irq < 0 && node)
+ irq = irq_of_parse_and_map(node, 0);
+
+ if (irq >= 0) {
+ irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
+ dev_name(dev));
+ ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
+ ecc);
+ if (ret) {
+ dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
+ return ret;
+ }
+ }
+
+ irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
+ if (irq < 0 && node)
+ irq = irq_of_parse_and_map(node, 2);
+
+ if (irq >= 0) {
+ irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
+ dev_name(dev));
+ ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
+ ecc);
+ if (ret) {
+ dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
+ return ret;
+ }
+ }
+
+ for (i = 0; i < ecc->num_channels; i++)
+ edma_map_dmach_to_queue(ecc, i, info->default_queue);
+
+ queue_priority_mapping = info->queue_priority_mapping;
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
+
+ /* Map the channel to param entry if channel mapping logic exist */
+ if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+ edma_direct_dmach_to_param_mapping(ecc);
+
+ for (i = 0; i < ecc->num_region; i++) {
+ edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
+ edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
+ edma_write_array(ecc, EDMA_QRAE, i, 0x0);
+ }
+ ecc->info = info;
+
+ ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
if (ecc->dummy_slot < 0) {
- dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n");
+ dev_err(dev, "Can't allocate PaRAM dummy slot\n");
return ecc->dummy_slot;
}
dma_cap_set(DMA_CYCLIC, ecc->dma_slave.cap_mask);
dma_cap_set(DMA_MEMCPY, ecc->dma_slave.cap_mask);
- edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev);
+ edma_dma_init(ecc, &ecc->dma_slave, dev);
edma_chan_init(ecc, &ecc->dma_slave, ecc->slave_chans);
if (ret)
goto err_reg1;
- platform_set_drvdata(pdev, ecc);
+ if (node)
+ of_dma_controller_register(node, of_dma_xlate_by_chan_id,
+ &ecc->dma_slave);
- dev_info(&pdev->dev, "TI EDMA DMA engine driver\n");
+ dev_info(dev, "TI EDMA DMA engine driver\n");
return 0;
err_reg1:
- edma_free_slot(ecc->dummy_slot);
+ edma_free_slot(ecc, ecc->dummy_slot);
return ret;
}
struct device *dev = &pdev->dev;
struct edma_cc *ecc = dev_get_drvdata(dev);
+ if (dev->of_node)
+ of_dma_controller_free(dev->of_node);
dma_async_device_unregister(&ecc->dma_slave);
- edma_free_slot(ecc->dummy_slot);
+ edma_free_slot(ecc, ecc->dummy_slot);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int edma_pm_resume(struct device *dev)
+{
+ struct edma_cc *ecc = dev_get_drvdata(dev);
+ int i;
+ s8 (*queue_priority_mapping)[2];
+
+ queue_priority_mapping = ecc->info->queue_priority_mapping;
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
+
+ /* Map the channel to param entry if channel mapping logic */
+ if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+ edma_direct_dmach_to_param_mapping(ecc);
+
+ for (i = 0; i < ecc->num_channels; i++) {
+ if (test_bit(i, ecc->edma_inuse)) {
+ /* ensure access through shadow region 0 */
+ edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
+ BIT(i & 0x1f));
+
+ edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, i),
+ ecc->intr_data[i].callback,
+ ecc->intr_data[i].data);
+ }
+ }
return 0;
}
+#endif
+
+static const struct dev_pm_ops edma_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, edma_pm_resume)
+};
static struct platform_driver edma_driver = {
.probe = edma_probe,
.remove = edma_remove,
.driver = {
- .name = "edma-dma-engine",
+ .name = "edma",
+ .pm = &edma_pm_ops,
+ .of_match_table = edma_of_ids,
},
};
projects / deliverable / linux.git / blobdiff