diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch | 1018 |
1 files changed, 0 insertions, 1018 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch b/target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch deleted file mode 100644 index 7ca14c805e..0000000000 --- a/target/linux/bcm27xx/patches-4.19/950-0565-bcm2835-dma-Add-proper-40-bit-DMA-support.patch +++ /dev/null @@ -1,1018 +0,0 @@ -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"); |