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openwrt/target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch
Adrian Schmutzler 7d7aa2fd92 brcm2708: rename target to bcm27xx 
This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Despite, since subtargets range from bcm2708 to bcm2711, it seems
appropriate to use bcm27xx instead of bcm2708 (again, as already done
for BOARDNAME).

This also renames the packages brcm2708-userland and brcm2708-gpu-fw.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
2020-02-14 14:10:51 +01:00

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From 621fb1606217c3e72feda69255ae6cb6a7ccfec2 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 4 Apr 2019 13:33:47 +0100
Subject: [PATCH] bcm2835-dma: Add proper 40-bit DMA support
The 40-bit additions are not fully tested, but it should be
capable of supporting both 40-bit memcpy on BCM2711 and regular
Lite channels on BCM2835.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/bcm2838.dtsi | 33 +-
drivers/dma/bcm2835-dma.c | 426 ++++++++++++++-----
drivers/pci/controller/pcie-brcmstb-bounce.c | 30 +-
drivers/pci/controller/pcie-brcmstb-bounce.h | 21 +-
drivers/pci/controller/pcie-brcmstb.c | 23 +-
5 files changed, 395 insertions(+), 138 deletions(-)
--- a/arch/arm/boot/dts/bcm2838.dtsi
+++ b/arch/arm/boot/dts/bcm2838.dtsi
@@ -372,6 +372,23 @@
};
};
+ dma40: dma@7e007b00 {
+ compatible = "brcm,bcm2838-dma";
+ reg = <0x0 0x7e007b00 0x400>;
+ interrupts =
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>, /* dma4 11 */
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>, /* dma4 12 */
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>, /* dma4 13 */
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>; /* dma4 14 */
+ interrupt-names = "dma11",
+ "dma12",
+ "dma13",
+ "dma14";
+ #dma-cells = <1>;
+ brcm,dma-channel-mask = <0x7000>;
+ };
+ /* DMA4 - 40 bit DMA engines */
+
xhci: xhci@7e9c0000 {
compatible = "generic-xhci";
status = "disabled";
@@ -689,6 +706,7 @@
};
&dma {
+ reg = <0x7e007000 0xb00>;
interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
@@ -699,12 +717,7 @@
<GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>, /* dmalite 7 */
<GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>, /* dmalite 8 */
<GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>, /* dmalite 9 */
- <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>, /* dmalite 10 */
- /* DMA4 - 40 bit DMA engines */
- <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>, /* dma4 11 */
- <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>, /* dma4 12 */
- <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>, /* dma4 13 */
- <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>; /* dma4 14 */
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>; /* dmalite 10 */
interrupt-names = "dma0",
"dma1",
"dma2",
@@ -715,10 +728,6 @@
"dma7",
"dma8",
"dma9",
- "dma10",
- "dma11",
- "dma12",
- "dma13",
- "dma14";
- brcm,dma-channel-mask = <0x7ef5>;
+ "dma10";
+ brcm,dma-channel-mask = <0x01f5>;
};
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -50,12 +50,18 @@
#define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14
#define BCM2835_DMA_CHAN_NAME_SIZE 8
#define BCM2835_DMA_BULK_MASK BIT(0)
+#define BCM2838_DMA_MEMCPY_CHAN 14
+
+struct bcm2835_dma_cfg_data {
+ u32 chan_40bit_mask;
+};
struct bcm2835_dmadev {
struct dma_device ddev;
spinlock_t lock;
void __iomem *base;
struct device_dma_parameters dma_parms;
+ const struct bcm2835_dma_cfg_data *cfg_data;
};
struct bcm2835_dma_cb {
@@ -100,6 +106,7 @@ struct bcm2835_chan {
unsigned int irq_flags;
bool is_lite_channel;
+ bool is_40bit_channel;
};
struct bcm2835_desc {
@@ -189,7 +196,8 @@ struct bcm2835_desc {
#define BCM2835_DMA_DATA_TYPE_S128 16
/* Valid only for channels 0 - 14, 15 has its own base address */
-#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */
+#define BCM2835_DMA_CHAN_SIZE 0x100
+#define BCM2835_DMA_CHAN(n) ((n) * BCM2835_DMA_CHAN_SIZE) /* Base address */
#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n))
/* the max dma length for different channels */
@@ -200,7 +208,7 @@ struct bcm2835_desc {
#define BCM2838_DMA40_CS 0x00
#define BCM2838_DMA40_CB 0x04
#define BCM2838_DMA40_DEBUG 0x0c
-#define BCM2858_DMA40_TI 0x10
+#define BCM2838_DMA40_TI 0x10
#define BCM2838_DMA40_SRC 0x14
#define BCM2838_DMA40_SRCI 0x18
#define BCM2838_DMA40_DEST 0x1c
@@ -209,32 +217,97 @@ struct bcm2835_desc {
#define BCM2838_DMA40_NEXT_CB 0x28
#define BCM2838_DMA40_DEBUG2 0x2c
-#define BCM2838_DMA40_CS_ACTIVE BIT(0)
-#define BCM2838_DMA40_CS_END BIT(1)
+#define BCM2838_DMA40_ACTIVE BIT(0)
+#define BCM2838_DMA40_END BIT(1)
+#define BCM2838_DMA40_INT BIT(2)
+#define BCM2838_DMA40_DREQ BIT(3) /* DREQ state */
+#define BCM2838_DMA40_RD_PAUSED BIT(4) /* Reading is paused */
+#define BCM2838_DMA40_WR_PAUSED BIT(5) /* Writing is paused */
+#define BCM2838_DMA40_DREQ_PAUSED BIT(6) /* Is paused by DREQ flow control */
+#define BCM2838_DMA40_WAITING_FOR_WRITES BIT(7) /* Waiting for last write */
+#define BCM2838_DMA40_ERR BIT(10)
+#define BCM2838_DMA40_QOS(x) (((x) & 0x1f) << 16)
+#define BCM2838_DMA40_PANIC_QOS(x) (((x) & 0x1f) << 20)
+#define BCM2838_DMA40_WAIT_FOR_WRITES BIT(28)
+#define BCM2838_DMA40_DISDEBUG BIT(29)
+#define BCM2838_DMA40_ABORT BIT(30)
+#define BCM2838_DMA40_HALT BIT(31)
+#define BCM2838_DMA40_CS_FLAGS(x) (x & (BCM2838_DMA40_QOS(15) | \
+ BCM2838_DMA40_PANIC_QOS(15) | \
+ BCM2838_DMA40_WAIT_FOR_WRITES | \
+ BCM2838_DMA40_DISDEBUG))
+
+/* Transfer information bits */
+#define BCM2838_DMA40_INTEN BIT(0)
+#define BCM2838_DMA40_TDMODE BIT(1) /* 2D-Mode */
+#define BCM2838_DMA40_WAIT_RESP BIT(2) /* wait for AXI write to be acked */
+#define BCM2838_DMA40_WAIT_RD_RESP BIT(3) /* wait for AXI read to complete */
+#define BCM2838_DMA40_PER_MAP(x) ((x & 31) << 9) /* REQ source */
+#define BCM2838_DMA40_S_DREQ BIT(14) /* enable SREQ for source */
+#define BCM2838_DMA40_D_DREQ BIT(15) /* enable DREQ for destination */
+#define BCM2838_DMA40_S_WAIT(x) ((x & 0xff) << 16) /* add DMA read-wait cycles */
+#define BCM2838_DMA40_D_WAIT(x) ((x & 0xff) << 24) /* add DMA write-wait cycles */
-#define BCM2838_DMA40_CS_QOS(x) (((x) & 0x1f) << 16)
-#define BCM2838_DMA40_CS_PANIC_QOS(x) (((x) & 0x1f) << 20)
-#define BCM2838_DMA40_CS_WRITE_WAIT BIT(28)
+/* debug register bits */
+#define BCM2838_DMA40_DEBUG_WRITE_ERR BIT(0)
+#define BCM2838_DMA40_DEBUG_FIFO_ERR BIT(1)
+#define BCM2838_DMA40_DEBUG_READ_ERR BIT(2)
+#define BCM2838_DMA40_DEBUG_READ_CB_ERR BIT(3)
+#define BCM2838_DMA40_DEBUG_IN_ON_ERR BIT(8)
+#define BCM2838_DMA40_DEBUG_ABORT_ON_ERR BIT(9)
+#define BCM2838_DMA40_DEBUG_HALT_ON_ERR BIT(10)
+#define BCM2838_DMA40_DEBUG_DISABLE_CLK_GATE BIT(11)
+#define BCM2838_DMA40_DEBUG_RSTATE_SHIFT 14
+#define BCM2838_DMA40_DEBUG_RSTATE_BITS 4
+#define BCM2838_DMA40_DEBUG_WSTATE_SHIFT 18
+#define BCM2838_DMA40_DEBUG_WSTATE_BITS 4
+#define BCM2838_DMA40_DEBUG_RESET BIT(23)
+#define BCM2838_DMA40_DEBUG_ID_SHIFT 24
+#define BCM2838_DMA40_DEBUG_ID_BITS 4
+#define BCM2838_DMA40_DEBUG_VERSION_SHIFT 28
+#define BCM2838_DMA40_DEBUG_VERSION_BITS 4
+
+/* Valid only for channels 0 - 3 (11 - 14) */
+#define BCM2838_DMA40_CHAN(n) (((n) + 11) << 8) /* Base address */
+#define BCM2838_DMA40_CHANIO(base, n) ((base) + BCM2838_DMA_CHAN(n))
-#define BCM2838_DMA40_BURST_LEN(x) ((((x) - 1) & 0xf) << 8)
-#define BCM2838_DMA40_INC BIT(12)
-#define BCM2838_DMA40_SIZE_128 (2 << 13)
+/* the max dma length for different channels */
+#define MAX_DMA40_LEN SZ_1G
-#define BCM2838_DMA40_MEMCPY_QOS \
- (BCM2838_DMA40_CS_QOS(0x0) | \
- BCM2838_DMA40_CS_PANIC_QOS(0x0) | \
- BCM2838_DMA40_CS_WRITE_WAIT)
+#define BCM2838_DMA40_BURST_LEN(x) ((min(x,16) - 1) << 8)
+#define BCM2838_DMA40_INC BIT(12)
+#define BCM2838_DMA40_SIZE_32 (0 << 13)
+#define BCM2838_DMA40_SIZE_64 (1 << 13)
+#define BCM2838_DMA40_SIZE_128 (2 << 13)
+#define BCM2838_DMA40_SIZE_256 (3 << 13)
+#define BCM2838_DMA40_IGNORE BIT(15)
+#define BCM2838_DMA40_STRIDE(x) ((x) << 16) /* For 2D mode */
+
+#define BCM2838_DMA40_MEMCPY_FLAGS \
+ (BCM2838_DMA40_QOS(0) | \
+ BCM2838_DMA40_PANIC_QOS(0) | \
+ BCM2838_DMA40_WAIT_FOR_WRITES | \
+ BCM2838_DMA40_DISDEBUG)
#define BCM2838_DMA40_MEMCPY_XFER_INFO \
(BCM2838_DMA40_SIZE_128 | \
BCM2838_DMA40_INC | \
BCM2838_DMA40_BURST_LEN(16))
+struct bcm2835_dmadev *memcpy_parent;
static void __iomem *memcpy_chan;
static struct bcm2838_dma40_scb *memcpy_scb;
static dma_addr_t memcpy_scb_dma;
DEFINE_SPINLOCK(memcpy_lock);
+static const struct bcm2835_dma_cfg_data bcm2835_dma_cfg = {
+ .chan_40bit_mask = 0,
+};
+
+static const struct bcm2835_dma_cfg_data bcm2838_dma_cfg = {
+ .chan_40bit_mask = BIT(11) | BIT(12) | BIT(13) | BIT(14),
+};
+
static inline size_t bcm2835_dma_max_frame_length(struct bcm2835_chan *c)
{
/* lite and normal channels have different max frame length */
@@ -264,6 +337,32 @@ static inline struct bcm2835_desc *to_bc
return container_of(t, struct bcm2835_desc, vd.tx);
}
+static inline uint32_t to_bcm2838_ti(uint32_t info)
+{
+ return ((info & BCM2835_DMA_INT_EN) ? BCM2838_DMA40_INTEN : 0) |
+ ((info & BCM2835_DMA_WAIT_RESP) ? BCM2838_DMA40_WAIT_RESP : 0) |
+ ((info & BCM2835_DMA_S_DREQ) ?
+ (BCM2838_DMA40_S_DREQ | BCM2838_DMA40_WAIT_RD_RESP) : 0) |
+ ((info & BCM2835_DMA_D_DREQ) ? BCM2838_DMA40_D_DREQ : 0) |
+ BCM2838_DMA40_PER_MAP((info >> 16) & 0x1f);
+}
+
+static inline uint32_t to_bcm2838_srci(uint32_t info)
+{
+ return ((info & BCM2835_DMA_S_INC) ? BCM2838_DMA40_INC : 0);
+}
+
+static inline uint32_t to_bcm2838_dsti(uint32_t info)
+{
+ return ((info & BCM2835_DMA_D_INC) ? BCM2838_DMA40_INC : 0);
+}
+
+static inline uint32_t to_bcm2838_cbaddr(dma_addr_t addr)
+{
+ BUG_ON(addr & 0x1f);
+ return (addr >> 5);
+}
+
static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc)
{
size_t i;
@@ -282,45 +381,53 @@ static void bcm2835_dma_desc_free(struct
}
static void bcm2835_dma_create_cb_set_length(
- struct bcm2835_chan *chan,
+ struct bcm2835_chan *c,
struct bcm2835_dma_cb *control_block,
size_t len,
size_t period_len,
size_t *total_len,
u32 finalextrainfo)
{
- size_t max_len = bcm2835_dma_max_frame_length(chan);
+ size_t max_len = bcm2835_dma_max_frame_length(c);
+ uint32_t cb_len;
/* set the length taking lite-channel limitations into account */
- control_block->length = min_t(u32, len, max_len);
+ cb_len = min_t(u32, len, max_len);
- /* finished if we have no period_length */
- if (!period_len)
- return;
+ if (period_len) {
+ /*
+ * period_len means: that we need to generate
+ * transfers that are terminating at every
+ * multiple of period_len - this is typically
+ * used to set the interrupt flag in info
+ * which is required during cyclic transfers
+ */
- /*
- * period_len means: that we need to generate
- * transfers that are terminating at every
- * multiple of period_len - this is typically
- * used to set the interrupt flag in info
- * which is required during cyclic transfers
- */
+ /* have we filled in period_length yet? */
+ if (*total_len + cb_len < period_len) {
+ /* update number of bytes in this period so far */
+ *total_len += cb_len;
+ } else {
+ /* calculate the length that remains to reach period_len */
+ cb_len = period_len - *total_len;
- /* have we filled in period_length yet? */
- if (*total_len + control_block->length < period_len) {
- /* update number of bytes in this period so far */
- *total_len += control_block->length;
- return;
+ /* reset total_length for next period */
+ *total_len = 0;
+ }
}
- /* calculate the length that remains to reach period_length */
- control_block->length = period_len - *total_len;
-
- /* reset total_length for next period */
- *total_len = 0;
-
- /* add extrainfo bits in info */
- control_block->info |= finalextrainfo;
+ if (c->is_40bit_channel) {
+ struct bcm2838_dma40_scb *scb =
+ (struct bcm2838_dma40_scb *)control_block;
+
+ scb->len = cb_len;
+ /* add extrainfo bits to ti */
+ scb->ti |= to_bcm2838_ti(finalextrainfo);
+ } else {
+ control_block->length = cb_len;
+ /* add extrainfo bits to info */
+ control_block->info |= finalextrainfo;
+ }
}
static inline size_t bcm2835_dma_count_frames_for_sg(
@@ -343,7 +450,7 @@ static inline size_t bcm2835_dma_count_f
/**
* bcm2835_dma_create_cb_chain - create a control block and fills data in
*
- * @chan: the @dma_chan for which we run this
+ * @c: the @bcm2835_chan for which we run this
* @direction: the direction in which we transfer
* @cyclic: it is a cyclic transfer
* @info: the default info bits to apply per controlblock
@@ -361,12 +468,11 @@ static inline size_t bcm2835_dma_count_f
* @gfp: the GFP flag to use for allocation
*/
static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
- struct dma_chan *chan, enum dma_transfer_direction direction,
+ struct bcm2835_chan *c, enum dma_transfer_direction direction,
bool cyclic, u32 info, u32 finalextrainfo, size_t frames,
dma_addr_t src, dma_addr_t dst, size_t buf_len,
size_t period_len, gfp_t gfp)
{
- struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
size_t len = buf_len, total_len;
size_t frame;
struct bcm2835_desc *d;
@@ -399,11 +505,23 @@ static struct bcm2835_desc *bcm2835_dma_
/* fill in the control block */
control_block = cb_entry->cb;
- control_block->info = info;
- control_block->src = src;
- control_block->dst = dst;
- control_block->stride = 0;
- control_block->next = 0;
+ if (c->is_40bit_channel) {
+ struct bcm2838_dma40_scb *scb =
+ (struct bcm2838_dma40_scb *)control_block;
+ scb->ti = to_bcm2838_ti(info);
+ scb->src = lower_32_bits(src);
+ scb->srci= upper_32_bits(src) | to_bcm2838_srci(info);
+ scb->dst = lower_32_bits(dst);
+ scb->dsti = upper_32_bits(dst) | to_bcm2838_dsti(info);
+ scb->next_cb = 0;
+ } else {
+ control_block->info = info;
+ control_block->src = src;
+ control_block->dst = dst;
+ control_block->stride = 0;
+ control_block->next = 0;
+ }
+
/* set up length in control_block if requested */
if (buf_len) {
/* calculate length honoring period_length */
@@ -417,7 +535,10 @@ static struct bcm2835_desc *bcm2835_dma_
}
/* link this the last controlblock */
- if (frame)
+ if (frame && c->is_40bit_channel)
+ d->cb_list[frame - 1].cb->next =
+ to_bcm2838_cbaddr(cb_entry->paddr);
+ if (frame && !c->is_40bit_channel)
d->cb_list[frame - 1].cb->next = cb_entry->paddr;
/* update src and dst and length */
@@ -431,7 +552,14 @@ static struct bcm2835_desc *bcm2835_dma_
}
/* the last frame requires extra flags */
- d->cb_list[d->frames - 1].cb->info |= finalextrainfo;
+ if (c->is_40bit_channel) {
+ struct bcm2838_dma40_scb *scb =
+ (struct bcm2838_dma40_scb *)d->cb_list[d->frames-1].cb;
+
+ scb->ti |= to_bcm2838_ti(finalextrainfo);
+ } else {
+ d->cb_list[d->frames - 1].cb->info |= finalextrainfo;
+ }
/* detect a size missmatch */
if (buf_len && (d->size != buf_len))
@@ -445,28 +573,51 @@ error_cb:
}
static void bcm2835_dma_fill_cb_chain_with_sg(
- struct dma_chan *chan,
+ struct bcm2835_chan *c,
enum dma_transfer_direction direction,
struct bcm2835_cb_entry *cb,
struct scatterlist *sgl,
unsigned int sg_len)
{
- struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
size_t len, max_len;
unsigned int i;
dma_addr_t addr;
struct scatterlist *sgent;
+ pr_err("dma_fill_chain_with_sg(ch %d, dir %d):\n", c->ch, direction);
+
max_len = bcm2835_dma_max_frame_length(c);
for_each_sg(sgl, sgent, sg_len, i) {
- for (addr = sg_dma_address(sgent), len = sg_dma_len(sgent);
- len > 0;
- addr += cb->cb->length, len -= cb->cb->length, cb++) {
- if (direction == DMA_DEV_TO_MEM)
- cb->cb->dst = addr;
- else
- cb->cb->src = addr;
- cb->cb->length = min(len, max_len);
+ if (c->is_40bit_channel) {
+ struct bcm2838_dma40_scb *scb =
+ (struct bcm2838_dma40_scb *)cb->cb;
+ for (addr = sg_dma_address(sgent),
+ len = sg_dma_len(sgent);
+ len > 0;
+ addr += scb->len, len -= scb->len, scb++) {
+ if (direction == DMA_DEV_TO_MEM) {
+ scb->dst = lower_32_bits(addr);
+ scb->dsti = upper_32_bits(addr) | BCM2838_DMA40_INC;
+ } else {
+ scb->src = lower_32_bits(addr);
+ scb->srci = upper_32_bits(addr) | BCM2838_DMA40_INC;
+ }
+ scb->len = min(len, max_len);
+ pr_err(" %llx, %x\n", (u64)addr, scb->len);
+ }
+ } else {
+ for (addr = sg_dma_address(sgent),
+ len = sg_dma_len(sgent);
+ len > 0;
+ addr += cb->cb->length, len -= cb->cb->length,
+ cb++) {
+ if (direction == DMA_DEV_TO_MEM)
+ cb->cb->dst = addr;
+ else
+ cb->cb->src = addr;
+ cb->cb->length = min(len, max_len);
+ pr_err(" %llx, %x\n", (u64)addr, cb->cb->length);
+ }
}
}
}
@@ -475,6 +626,10 @@ static int bcm2835_dma_abort(struct bcm2
{
void __iomem *chan_base = c->chan_base;
long int timeout = 10000;
+ u32 wait_mask = BCM2835_DMA_WAITING_FOR_WRITES;
+
+ if (c->is_40bit_channel)
+ wait_mask = BCM2838_DMA40_WAITING_FOR_WRITES;
/*
* A zero control block address means the channel is idle.
@@ -487,8 +642,7 @@ static int bcm2835_dma_abort(struct bcm2
writel(0, chan_base + BCM2835_DMA_CS);
/* Wait for any current AXI transfer to complete */
- while ((readl(chan_base + BCM2835_DMA_CS) &
- BCM2835_DMA_WAITING_FOR_WRITES) && --timeout)
+ while ((readl(chan_base + BCM2835_DMA_CS) & wait_mask) && --timeout)
cpu_relax();
/* Peripheral might be stuck and fail to signal AXI write responses */
@@ -505,6 +659,7 @@ static void bcm2835_dma_start_desc(struc
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
struct bcm2835_desc *d;
+ pr_err("dma_start_desc(%px)\n", vd);
if (!vd) {
c->desc = NULL;
return;
@@ -514,9 +669,16 @@ static void bcm2835_dma_start_desc(struc
c->desc = d = to_bcm2835_dma_desc(&vd->tx);
- writel(d->cb_list[0].paddr, c->chan_base + BCM2835_DMA_ADDR);
- writel(BCM2835_DMA_ACTIVE | BCM2835_DMA_CS_FLAGS(c->dreq),
- c->chan_base + BCM2835_DMA_CS);
+ if (c->is_40bit_channel) {
+ writel(to_bcm2838_cbaddr(d->cb_list[0].paddr),
+ c->chan_base + BCM2838_DMA40_CB);
+ writel(BCM2838_DMA40_ACTIVE | BCM2838_DMA40_CS_FLAGS(c->dreq),
+ c->chan_base + BCM2838_DMA40_CS);
+ } else {
+ writel(d->cb_list[0].paddr, c->chan_base + BCM2835_DMA_ADDR);
+ writel(BCM2835_DMA_ACTIVE | BCM2835_DMA_CS_FLAGS(c->dreq),
+ c->chan_base + BCM2835_DMA_CS);
+ }
}
static irqreturn_t bcm2835_dma_callback(int irq, void *data)
@@ -544,7 +706,8 @@ static irqreturn_t bcm2835_dma_callback(
* will remain idle despite the ACTIVE flag being set.
*/
writel(BCM2835_DMA_INT | BCM2835_DMA_ACTIVE |
- BCM2835_DMA_CS_FLAGS(c->dreq),
+ (c->is_40bit_channel ? BCM2838_DMA40_CS_FLAGS(c->dreq) :
+ BCM2835_DMA_CS_FLAGS(c->dreq)),
c->chan_base + BCM2835_DMA_CS);
d = c->desc;
@@ -643,9 +806,17 @@ static enum dma_status bcm2835_dma_tx_st
struct bcm2835_desc *d = c->desc;
dma_addr_t pos;
- if (d->dir == DMA_MEM_TO_DEV)
+ if (d->dir == DMA_MEM_TO_DEV && c->is_40bit_channel)
+ pos = readl(c->chan_base + BCM2838_DMA40_SRC) +
+ ((readl(c->chan_base + BCM2838_DMA40_SRCI) &
+ 0xff) << 8);
+ else if (d->dir == DMA_MEM_TO_DEV && !c->is_40bit_channel)
pos = readl(c->chan_base + BCM2835_DMA_SOURCE_AD);
- else if (d->dir == DMA_DEV_TO_MEM)
+ else if (d->dir == DMA_DEV_TO_MEM && c->is_40bit_channel)
+ pos = readl(c->chan_base + BCM2838_DMA40_DEST) +
+ ((readl(c->chan_base + BCM2838_DMA40_DESTI) &
+ 0xff) << 8);
+ else if (d->dir == DMA_DEV_TO_MEM && !c->is_40bit_channel)
pos = readl(c->chan_base + BCM2835_DMA_DEST_AD);
else
pos = 0;
@@ -691,7 +862,7 @@ static struct dma_async_tx_descriptor *b
frames = bcm2835_dma_frames_for_length(len, max_len);
/* allocate the CB chain - this also fills in the pointers */
- d = bcm2835_dma_create_cb_chain(chan, DMA_MEM_TO_MEM, false,
+ d = bcm2835_dma_create_cb_chain(c, DMA_MEM_TO_MEM, false,
info, extra, frames,
src, dst, len, 0, GFP_KERNEL);
if (!d)
@@ -726,11 +897,21 @@ static struct dma_async_tx_descriptor *b
if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
src = c->cfg.src_addr;
+ /*
+ * One would think it ought to be possible to get the physical
+ * to dma address mapping information from the dma-ranges DT
+ * property, but I've not found a way yet that doesn't involve
+ * open-coding the whole thing.
+ */
+ if (c->is_40bit_channel)
+ src |= 0x400000000ull;
info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
dst = c->cfg.dst_addr;
+ if (c->is_40bit_channel)
+ dst |= 0x400000000ull;
info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
}
@@ -738,7 +919,7 @@ static struct dma_async_tx_descriptor *b
frames = bcm2835_dma_count_frames_for_sg(c, sgl, sg_len);
/* allocate the CB chain */
- d = bcm2835_dma_create_cb_chain(chan, direction, false,
+ d = bcm2835_dma_create_cb_chain(c, direction, false,
info, extra,
frames, src, dst, 0, 0,
GFP_KERNEL);
@@ -746,7 +927,7 @@ static struct dma_async_tx_descriptor *b
return NULL;
/* fill in frames with scatterlist pointers */
- bcm2835_dma_fill_cb_chain_with_sg(chan, direction, d->cb_list,
+ bcm2835_dma_fill_cb_chain_with_sg(c, direction, d->cb_list,
sgl, sg_len);
return vchan_tx_prep(&c->vc, &d->vd, flags);
@@ -815,7 +996,7 @@ static struct dma_async_tx_descriptor *b
* note that we need to use GFP_NOWAIT, as the ALSA i2s dmaengine
* implementation calls prep_dma_cyclic with interrupts disabled.
*/
- d = bcm2835_dma_create_cb_chain(chan, direction, true,
+ d = bcm2835_dma_create_cb_chain(c, direction, true,
info, extra,
frames, src, dst, buf_len,
period_len, GFP_NOWAIT);
@@ -823,7 +1004,8 @@ static struct dma_async_tx_descriptor *b
return NULL;
/* wrap around into a loop */
- d->cb_list[d->frames - 1].cb->next = d->cb_list[0].paddr;
+ d->cb_list[d->frames - 1].cb->next = c->is_40bit_channel ?
+ to_bcm2838_cbaddr(d->cb_list[0].paddr) : d->cb_list[0].paddr;
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
@@ -899,9 +1081,11 @@ static int bcm2835_dma_chan_init(struct
c->irq_number = irq;
c->irq_flags = irq_flags;
- /* check in DEBUG register if this is a LITE channel */
- if (readl(c->chan_base + BCM2835_DMA_DEBUG) &
- BCM2835_DMA_DEBUG_LITE)
+ /* check for 40bit and lite channels */
+ if (d->cfg_data->chan_40bit_mask & BIT(chan_id))
+ c->is_40bit_channel = true;
+ else if (readl(c->chan_base + BCM2835_DMA_DEBUG) &
+ BCM2835_DMA_DEBUG_LITE)
c->is_lite_channel = true;
return 0;
@@ -918,18 +1102,16 @@ static void bcm2835_dma_free(struct bcm2
}
}
-int bcm2838_dma40_memcpy_init(struct device *dev)
+int bcm2838_dma40_memcpy_init(void)
{
- if (memcpy_scb)
- return 0;
+ if (!memcpy_parent)
+ return -EPROBE_DEFER;
- memcpy_scb = dma_alloc_coherent(dev, sizeof(*memcpy_scb),
- &memcpy_scb_dma, GFP_KERNEL);
+ if (!memcpy_chan)
+ return -EINVAL;
- if (!memcpy_scb) {
- pr_err("bcm2838_dma40_memcpy_init failed!\n");
+ if (!memcpy_scb)
return -ENOMEM;
- }
return 0;
}
@@ -956,20 +1138,22 @@ void bcm2838_dma40_memcpy(dma_addr_t dst
scb->next_cb = 0;
writel((u32)(memcpy_scb_dma >> 5), memcpy_chan + BCM2838_DMA40_CB);
- writel(BCM2838_DMA40_MEMCPY_QOS + BCM2838_DMA40_CS_ACTIVE,
+ writel(BCM2838_DMA40_MEMCPY_FLAGS + BCM2838_DMA40_ACTIVE,
memcpy_chan + BCM2838_DMA40_CS);
+
/* Poll for completion */
- while (!(readl(memcpy_chan + BCM2838_DMA40_CS) & BCM2838_DMA40_CS_END))
+ while (!(readl(memcpy_chan + BCM2838_DMA40_CS) & BCM2838_DMA40_END))
cpu_relax();
- writel(BCM2838_DMA40_CS_END, memcpy_chan + BCM2838_DMA40_CS);
+ writel(BCM2838_DMA40_END, memcpy_chan + BCM2838_DMA40_CS);
spin_unlock_irqrestore(&memcpy_lock, flags);
}
EXPORT_SYMBOL(bcm2838_dma40_memcpy);
static const struct of_device_id bcm2835_dma_of_match[] = {
- { .compatible = "brcm,bcm2835-dma", },
+ { .compatible = "brcm,bcm2835-dma", .data = &bcm2835_dma_cfg },
+ { .compatible = "brcm,bcm2838-dma", .data = &bcm2838_dma_cfg },
{},
};
MODULE_DEVICE_TABLE(of, bcm2835_dma_of_match);
@@ -1001,6 +1185,8 @@ static int bcm2835_dma_probe(struct plat
int irq_flags;
uint32_t chans_available;
char chan_name[BCM2835_DMA_CHAN_NAME_SIZE];
+ const struct of_device_id *of_id;
+ int chan_count, chan_start, chan_end;
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
@@ -1022,9 +1208,13 @@ static int bcm2835_dma_probe(struct plat
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
- rc = bcm_dmaman_probe(pdev, base, BCM2835_DMA_BULK_MASK);
- if (rc)
- dev_err(&pdev->dev, "Failed to initialize the legacy API\n");
+
+ /* The set of channels can be split across multiple instances. */
+ chan_start = ((u32)base / BCM2835_DMA_CHAN_SIZE) & 0xf;
+ base -= BCM2835_DMA_CHAN(chan_start);
+ chan_count = resource_size(res) / BCM2835_DMA_CHAN_SIZE;
+ chan_end = min(chan_start + chan_count,
+ BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED + 1);
od->base = base;
@@ -1054,6 +1244,14 @@ static int bcm2835_dma_probe(struct plat
platform_set_drvdata(pdev, od);
+ of_id = of_match_node(bcm2835_dma_of_match, pdev->dev.of_node);
+ if (!of_id) {
+ dev_err(&pdev->dev, "Failed to match compatible string\n");
+ return -EINVAL;
+ }
+
+ od->cfg_data = of_id->data;
+
/* Request DMA channel mask from device tree */
if (of_property_read_u32(pdev->dev.of_node,
"brcm,dma-channel-mask",
@@ -1063,18 +1261,34 @@ static int bcm2835_dma_probe(struct plat
goto err_no_dma;
}
- /* Channel 0 is used by the legacy API */
- chans_available &= ~BCM2835_DMA_BULK_MASK;
+ /* One channel is reserved for the legacy API */
+ if (chans_available & BCM2835_DMA_BULK_MASK) {
+ rc = bcm_dmaman_probe(pdev, base,
+ chans_available & BCM2835_DMA_BULK_MASK);
+ if (rc)
+ dev_err(&pdev->dev,
+ "Failed to initialize the legacy API\n");
+
+ chans_available &= ~BCM2835_DMA_BULK_MASK;
+ }
- /* We can't use channels 11-13 yet */
- chans_available &= ~(BIT(11) | BIT(12) | BIT(13));
+ /* And possibly one for the 40-bit DMA memcpy API */
+ if (chans_available & od->cfg_data->chan_40bit_mask &
+ BIT(BCM2838_DMA_MEMCPY_CHAN)) {
+ memcpy_parent = od;
+ memcpy_chan = BCM2835_DMA_CHANIO(base, BCM2838_DMA_MEMCPY_CHAN);
+ memcpy_scb = dma_alloc_coherent(memcpy_parent->ddev.dev,
+ sizeof(*memcpy_scb),
+ &memcpy_scb_dma, GFP_KERNEL);
+ if (!memcpy_scb)
+ dev_warn(&pdev->dev,
+ "Failed to allocated memcpy scb\n");
- /* Grab channel 14 for the 40-bit DMA memcpy */
- chans_available &= ~BIT(14);
- memcpy_chan = BCM2835_DMA_CHANIO(base, 14);
+ chans_available &= ~BIT(BCM2838_DMA_MEMCPY_CHAN);
+ }
/* get irqs for each channel that we support */
- for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
+ for (i = chan_start; i < chan_end; i++) {
/* skip masked out channels */
if (!(chans_available & (1 << i))) {
irq[i] = -1;
@@ -1097,13 +1311,17 @@ static int bcm2835_dma_probe(struct plat
irq[i] = platform_get_irq(pdev, i < 11 ? i : 11);
}
+ chan_count = 0;
+
/* get irqs for each channel */
- for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
+ for (i = chan_start; i < chan_end; i++) {
/* skip channels without irq */
if (irq[i] < 0)
continue;
/* check if there are other channels that also use this irq */
+ /* FIXME: This will fail if interrupts are shared across
+ instances */
irq_flags = 0;
for (j = 0; j <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; j++)
if ((i != j) && (irq[j] == irq[i])) {
@@ -1115,9 +1333,10 @@ static int bcm2835_dma_probe(struct plat
rc = bcm2835_dma_chan_init(od, i, irq[i], irq_flags);
if (rc)
goto err_no_dma;
+ chan_count++;
}
- dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", i);
+ dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", chan_count);
/* Device-tree DMA controller registration */
rc = of_dma_controller_register(pdev->dev.of_node,
@@ -1149,6 +1368,13 @@ static int bcm2835_dma_remove(struct pla
bcm_dmaman_remove(pdev);
dma_async_device_unregister(&od->ddev);
+ if (memcpy_parent == od) {
+ dma_free_coherent(&pdev->dev, sizeof(*memcpy_scb), memcpy_scb,
+ memcpy_scb_dma);
+ memcpy_parent = NULL;
+ memcpy_scb = NULL;
+ memcpy_chan = NULL;
+ }
bcm2835_dma_free(od);
return 0;
--- a/drivers/pci/controller/pcie-brcmstb-bounce.c
+++ b/drivers/pci/controller/pcie-brcmstb-bounce.c
@@ -91,7 +91,7 @@ struct dmabounce_device_info {
static struct dmabounce_device_info *g_dmabounce_device_info;
-extern int bcm2838_dma40_memcpy_init(struct device *dev);
+extern int bcm2838_dma40_memcpy_init(void);
extern void bcm2838_dma40_memcpy(dma_addr_t dst, dma_addr_t src, size_t size);
#ifdef STATS
@@ -471,9 +471,9 @@ static const struct dma_map_ops dmabounc
.mapping_error = dmabounce_mapping_error,
};
-int brcm_pcie_bounce_register_dev(struct device *dev,
- unsigned long buffer_size,
- dma_addr_t threshold)
+int brcm_pcie_bounce_init(struct device *dev,
+ unsigned long buffer_size,
+ dma_addr_t threshold)
{
struct dmabounce_device_info *device_info;
int ret;
@@ -482,9 +482,9 @@ int brcm_pcie_bounce_register_dev(struct
if (g_dmabounce_device_info)
return -EBUSY;
- ret = bcm2838_dma40_memcpy_init(dev);
+ ret = bcm2838_dma40_memcpy_init();
if (ret)
- return ret;
+ return ret;
device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
if (!device_info) {
@@ -515,9 +515,8 @@ int brcm_pcie_bounce_register_dev(struct
device_create_file(dev, &dev_attr_dmabounce_stats));
g_dmabounce_device_info = device_info;
- set_dma_ops(dev, &dmabounce_ops);
- dev_info(dev, "dmabounce: registered device - %ld kB, threshold %pad\n",
+ dev_info(dev, "dmabounce: initialised - %ld kB, threshold %pad\n",
buffer_size / 1024, &threshold);
return 0;
@@ -526,14 +525,13 @@ int brcm_pcie_bounce_register_dev(struct
kfree(device_info);
return ret;
}
-EXPORT_SYMBOL(brcm_pcie_bounce_register_dev);
+EXPORT_SYMBOL(brcm_pcie_bounce_init);
-void brcm_pcie_bounce_unregister_dev(struct device *dev)
+void brcm_pcie_bounce_uninit(struct device *dev)
{
struct dmabounce_device_info *device_info = g_dmabounce_device_info;
g_dmabounce_device_info = NULL;
- set_dma_ops(dev, NULL);
if (!device_info) {
dev_warn(dev,
@@ -554,10 +552,16 @@ void brcm_pcie_bounce_unregister_dev(str
device_remove_file(dev, &dev_attr_dmabounce_stats));
kfree(device_info);
+}
+EXPORT_SYMBOL(brcm_pcie_bounce_uninit);
+
+int brcm_pcie_bounce_register_dev(struct device *dev)
+{
+ set_dma_ops(dev, &dmabounce_ops);
- dev_info(dev, "dmabounce: device unregistered\n");
+ return 0;
}
-EXPORT_SYMBOL(brcm_pcie_bounce_unregister_dev);
+EXPORT_SYMBOL(brcm_pcie_bounce_register_dev);
MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.org>");
MODULE_DESCRIPTION("Dedicate DMA bounce support for pcie-brcmstb");
--- a/drivers/pci/controller/pcie-brcmstb-bounce.h
+++ b/drivers/pci/controller/pcie-brcmstb-bounce.h
@@ -8,21 +8,26 @@
#ifdef CONFIG_ARM
-int brcm_pcie_bounce_register_dev(struct device *dev, unsigned long buffer_size,
- dma_addr_t threshold);
-
-int brcm_pcie_bounce_unregister_dev(struct device *dev);
+int brcm_pcie_bounce_init(struct device *dev, unsigned long buffer_size,
+ dma_addr_t threshold);
+int brcm_pcie_bounce_uninit(struct device *dev);
+int brcm_pcie_bounce_register_dev(struct device *dev);
#else
-static inline int brcm_pcie_bounce_register_dev(struct device *dev,
- unsigned long buffer_size,
- dma_addr_t threshold)
+static inline int brcm_pcie_bounce_init(struct device *dev,
+ unsigned long buffer_size,
+ dma_addr_t threshold)
+{
+ return 0;
+}
+
+static inline int brcm_pcie_bounce_uninit(struct device *dev)
{
return 0;
}
-static inline int brcm_pcie_bounce_unregister_dev(struct device *dev)
+static inline int brcm_pcie_bounce_register_dev(struct device *dev)
{
return 0;
}
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -650,6 +650,7 @@ static void brcm_set_dma_ops(struct devi
static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie,
unsigned int val);
+
static int brcmstb_platform_notifier(struct notifier_block *nb,
unsigned long event, void *__dev)
{
@@ -663,12 +664,11 @@ static int brcmstb_platform_notifier(str
strcmp(dev->kobj.name, rc_name)) {
int ret;
- ret = brcm_pcie_bounce_register_dev(dev, bounce_buffer,
- (dma_addr_t)bounce_threshold);
+ ret = brcm_pcie_bounce_register_dev(dev);
if (ret) {
dev_err(dev,
"brcm_pcie_bounce_register_dev() failed: %d\n",
- ret);
+ ret);
return ret;
}
}
@@ -681,8 +681,6 @@ static int brcmstb_platform_notifier(str
brcm_pcie_perst_set(g_pcie, 1);
msleep(100);
brcm_pcie_perst_set(g_pcie, 0);
- } else if (max_pfn > (bounce_threshold/PAGE_SIZE)) {
- brcm_pcie_bounce_unregister_dev(dev);
}
return NOTIFY_OK;
@@ -1718,6 +1716,7 @@ static int brcm_pcie_probe(struct platfo
void __iomem *base;
struct pci_host_bridge *bridge;
struct pci_bus *child;
+ extern unsigned long max_pfn;
bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
if (!bridge)
@@ -1753,6 +1752,20 @@ static int brcm_pcie_probe(struct platfo
if (IS_ERR(base))
return PTR_ERR(base);
+ /* To Do: Add hardware check if this ever gets fixed */
+ if (max_pfn > (bounce_threshold/PAGE_SIZE)) {
+ int ret;
+ ret = brcm_pcie_bounce_init(&pdev->dev, bounce_buffer,
+ (dma_addr_t)bounce_threshold);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev,
+ "could not init bounce buffers: %d\n",
+ ret);
+ return ret;
+ }
+ }
+
pcie->clk = of_clk_get_by_name(dn, "sw_pcie");
if (IS_ERR(pcie->clk)) {
dev_warn(&pdev->dev, "could not get clock\n");
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