diff options
author | Sergio Paracuellos <sergio.paracuellos@gmail.com> | 2021-11-13 22:20:44 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-15 12:29:12 +0300 |
commit | 87dd67f496f71c3693431a236b2b542793d786ff (patch) | |
tree | 9aa3dafb953b19fbc85cdd1332e1f7a6759a4e1e /drivers | |
parent | 5bfc10690c6c590a972be014ed8595e77e1e2dea (diff) | |
download | linux-87dd67f496f71c3693431a236b2b542793d786ff.tar.xz |
staging: mt7621-dma: remove driver from tree
This driver was a added a time ago and there is no special effort or work
to clean it and any progress at all to mainline it. Also, there is already
a driver from Mediatek in 'drivers/dma/mediatek/mtk-hsdma.c' which looks
pretty similar to this. So the way of supporting HSDMA for mt7621 would be
to modify that driver instead.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20211113192045.32153-3-sergio.paracuellos@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/staging/Kconfig | 2 | ||||
-rw-r--r-- | drivers/staging/Makefile | 1 | ||||
-rw-r--r-- | drivers/staging/mt7621-dma/Kconfig | 7 | ||||
-rw-r--r-- | drivers/staging/mt7621-dma/Makefile | 4 | ||||
-rw-r--r-- | drivers/staging/mt7621-dma/TODO | 5 | ||||
-rw-r--r-- | drivers/staging/mt7621-dma/hsdma-mt7621.c | 758 |
6 files changed, 0 insertions, 777 deletions
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig index c7ab0210dc4b..893af6f05e06 100644 --- a/drivers/staging/Kconfig +++ b/drivers/staging/Kconfig @@ -86,8 +86,6 @@ source "drivers/staging/vc04_services/Kconfig" source "drivers/staging/pi433/Kconfig" -source "drivers/staging/mt7621-dma/Kconfig" - source "drivers/staging/mt7621-dts/Kconfig" source "drivers/staging/axis-fifo/Kconfig" diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile index f1bee2a864ff..62a86fa2ab2e 100644 --- a/drivers/staging/Makefile +++ b/drivers/staging/Makefile @@ -33,7 +33,6 @@ obj-$(CONFIG_KS7010) += ks7010/ obj-$(CONFIG_GREYBUS) += greybus/ obj-$(CONFIG_BCM2835_VCHIQ) += vc04_services/ obj-$(CONFIG_PI433) += pi433/ -obj-$(CONFIG_SOC_MT7621) += mt7621-dma/ obj-$(CONFIG_SOC_MT7621) += mt7621-dts/ obj-$(CONFIG_XIL_AXIS_FIFO) += axis-fifo/ obj-$(CONFIG_FIELDBUS_DEV) += fieldbus/ diff --git a/drivers/staging/mt7621-dma/Kconfig b/drivers/staging/mt7621-dma/Kconfig deleted file mode 100644 index 54a110288f92..000000000000 --- a/drivers/staging/mt7621-dma/Kconfig +++ /dev/null @@ -1,7 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -config MTK_HSDMA - tristate "MTK HSDMA support" - depends on RALINK && SOC_MT7621 - select DMA_ENGINE - select DMA_VIRTUAL_CHANNELS - diff --git a/drivers/staging/mt7621-dma/Makefile b/drivers/staging/mt7621-dma/Makefile deleted file mode 100644 index 23256d1286f3..000000000000 --- a/drivers/staging/mt7621-dma/Makefile +++ /dev/null @@ -1,4 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_MTK_HSDMA) += hsdma-mt7621.o - -ccflags-y += -I$(srctree)/drivers/dma diff --git a/drivers/staging/mt7621-dma/TODO b/drivers/staging/mt7621-dma/TODO deleted file mode 100644 index fdbc5002c32a..000000000000 --- a/drivers/staging/mt7621-dma/TODO +++ /dev/null @@ -1,5 +0,0 @@ - -- general code review and clean up -- ensure device-tree requirements are documented - -Cc: NeilBrown <neil@brown.name> diff --git a/drivers/staging/mt7621-dma/hsdma-mt7621.c b/drivers/staging/mt7621-dma/hsdma-mt7621.c deleted file mode 100644 index 1424d01d434b..000000000000 --- a/drivers/staging/mt7621-dma/hsdma-mt7621.c +++ /dev/null @@ -1,758 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (C) 2015, Michael Lee <igvtee@gmail.com> - * MTK HSDMA support - */ - -#include <linux/dmaengine.h> -#include <linux/dma-mapping.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/irq.h> -#include <linux/of_dma.h> -#include <linux/reset.h> -#include <linux/of_device.h> - -#include "virt-dma.h" - -#define HSDMA_BASE_OFFSET 0x800 - -#define HSDMA_REG_TX_BASE 0x00 -#define HSDMA_REG_TX_CNT 0x04 -#define HSDMA_REG_TX_CTX 0x08 -#define HSDMA_REG_TX_DTX 0x0c -#define HSDMA_REG_RX_BASE 0x100 -#define HSDMA_REG_RX_CNT 0x104 -#define HSDMA_REG_RX_CRX 0x108 -#define HSDMA_REG_RX_DRX 0x10c -#define HSDMA_REG_INFO 0x200 -#define HSDMA_REG_GLO_CFG 0x204 -#define HSDMA_REG_RST_CFG 0x208 -#define HSDMA_REG_DELAY_INT 0x20c -#define HSDMA_REG_FREEQ_THRES 0x210 -#define HSDMA_REG_INT_STATUS 0x220 -#define HSDMA_REG_INT_MASK 0x228 -#define HSDMA_REG_SCH_Q01 0x280 -#define HSDMA_REG_SCH_Q23 0x284 - -#define HSDMA_DESCS_MAX 0xfff -#define HSDMA_DESCS_NUM 8 -#define HSDMA_DESCS_MASK (HSDMA_DESCS_NUM - 1) -#define HSDMA_NEXT_DESC(x) (((x) + 1) & HSDMA_DESCS_MASK) - -/* HSDMA_REG_INFO */ -#define HSDMA_INFO_INDEX_MASK 0xf -#define HSDMA_INFO_INDEX_SHIFT 24 -#define HSDMA_INFO_BASE_MASK 0xff -#define HSDMA_INFO_BASE_SHIFT 16 -#define HSDMA_INFO_RX_MASK 0xff -#define HSDMA_INFO_RX_SHIFT 8 -#define HSDMA_INFO_TX_MASK 0xff -#define HSDMA_INFO_TX_SHIFT 0 - -/* HSDMA_REG_GLO_CFG */ -#define HSDMA_GLO_TX_2B_OFFSET BIT(31) -#define HSDMA_GLO_CLK_GATE BIT(30) -#define HSDMA_GLO_BYTE_SWAP BIT(29) -#define HSDMA_GLO_MULTI_DMA BIT(10) -#define HSDMA_GLO_TWO_BUF BIT(9) -#define HSDMA_GLO_32B_DESC BIT(8) -#define HSDMA_GLO_BIG_ENDIAN BIT(7) -#define HSDMA_GLO_TX_DONE BIT(6) -#define HSDMA_GLO_BT_MASK 0x3 -#define HSDMA_GLO_BT_SHIFT 4 -#define HSDMA_GLO_RX_BUSY BIT(3) -#define HSDMA_GLO_RX_DMA BIT(2) -#define HSDMA_GLO_TX_BUSY BIT(1) -#define HSDMA_GLO_TX_DMA BIT(0) - -#define HSDMA_BT_SIZE_16BYTES (0 << HSDMA_GLO_BT_SHIFT) -#define HSDMA_BT_SIZE_32BYTES (1 << HSDMA_GLO_BT_SHIFT) -#define HSDMA_BT_SIZE_64BYTES (2 << HSDMA_GLO_BT_SHIFT) -#define HSDMA_BT_SIZE_128BYTES (3 << HSDMA_GLO_BT_SHIFT) - -#define HSDMA_GLO_DEFAULT (HSDMA_GLO_MULTI_DMA | \ - HSDMA_GLO_RX_DMA | HSDMA_GLO_TX_DMA | HSDMA_BT_SIZE_32BYTES) - -/* HSDMA_REG_RST_CFG */ -#define HSDMA_RST_RX_SHIFT 16 -#define HSDMA_RST_TX_SHIFT 0 - -/* HSDMA_REG_DELAY_INT */ -#define HSDMA_DELAY_INT_EN BIT(15) -#define HSDMA_DELAY_PEND_OFFSET 8 -#define HSDMA_DELAY_TIME_OFFSET 0 -#define HSDMA_DELAY_TX_OFFSET 16 -#define HSDMA_DELAY_RX_OFFSET 0 - -#define HSDMA_DELAY_INIT(x) (HSDMA_DELAY_INT_EN | \ - ((x) << HSDMA_DELAY_PEND_OFFSET)) -#define HSDMA_DELAY(x) ((HSDMA_DELAY_INIT(x) << \ - HSDMA_DELAY_TX_OFFSET) | HSDMA_DELAY_INIT(x)) - -/* HSDMA_REG_INT_STATUS */ -#define HSDMA_INT_DELAY_RX_COH BIT(31) -#define HSDMA_INT_DELAY_RX_INT BIT(30) -#define HSDMA_INT_DELAY_TX_COH BIT(29) -#define HSDMA_INT_DELAY_TX_INT BIT(28) -#define HSDMA_INT_RX_MASK 0x3 -#define HSDMA_INT_RX_SHIFT 16 -#define HSDMA_INT_RX_Q0 BIT(16) -#define HSDMA_INT_TX_MASK 0xf -#define HSDMA_INT_TX_SHIFT 0 -#define HSDMA_INT_TX_Q0 BIT(0) - -/* tx/rx dma desc flags */ -#define HSDMA_PLEN_MASK 0x3fff -#define HSDMA_DESC_DONE BIT(31) -#define HSDMA_DESC_LS0 BIT(30) -#define HSDMA_DESC_PLEN0(_x) (((_x) & HSDMA_PLEN_MASK) << 16) -#define HSDMA_DESC_TAG BIT(15) -#define HSDMA_DESC_LS1 BIT(14) -#define HSDMA_DESC_PLEN1(_x) ((_x) & HSDMA_PLEN_MASK) - -/* align 4 bytes */ -#define HSDMA_ALIGN_SIZE 3 -/* align size 128bytes */ -#define HSDMA_MAX_PLEN 0x3f80 - -struct hsdma_desc { - u32 addr0; - u32 flags; - u32 addr1; - u32 unused; -}; - -struct mtk_hsdma_sg { - dma_addr_t src_addr; - dma_addr_t dst_addr; - u32 len; -}; - -struct mtk_hsdma_desc { - struct virt_dma_desc vdesc; - unsigned int num_sgs; - struct mtk_hsdma_sg sg[1]; -}; - -struct mtk_hsdma_chan { - struct virt_dma_chan vchan; - unsigned int id; - dma_addr_t desc_addr; - int tx_idx; - int rx_idx; - struct hsdma_desc *tx_ring; - struct hsdma_desc *rx_ring; - struct mtk_hsdma_desc *desc; - unsigned int next_sg; -}; - -struct mtk_hsdam_engine { - struct dma_device ddev; - struct device_dma_parameters dma_parms; - void __iomem *base; - struct tasklet_struct task; - volatile unsigned long chan_issued; - - struct mtk_hsdma_chan chan[1]; -}; - -static inline struct mtk_hsdam_engine *mtk_hsdma_chan_get_dev(struct mtk_hsdma_chan *chan) -{ - return container_of(chan->vchan.chan.device, struct mtk_hsdam_engine, - ddev); -} - -static inline struct mtk_hsdma_chan *to_mtk_hsdma_chan(struct dma_chan *c) -{ - return container_of(c, struct mtk_hsdma_chan, vchan.chan); -} - -static inline struct mtk_hsdma_desc *to_mtk_hsdma_desc(struct virt_dma_desc *vdesc) -{ - return container_of(vdesc, struct mtk_hsdma_desc, vdesc); -} - -static inline u32 mtk_hsdma_read(struct mtk_hsdam_engine *hsdma, u32 reg) -{ - return readl(hsdma->base + reg); -} - -static inline void mtk_hsdma_write(struct mtk_hsdam_engine *hsdma, - unsigned int reg, u32 val) -{ - writel(val, hsdma->base + reg); -} - -static void mtk_hsdma_reset_chan(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - chan->tx_idx = 0; - chan->rx_idx = HSDMA_DESCS_NUM - 1; - - mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx); - mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx); - - mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG, - 0x1 << (chan->id + HSDMA_RST_TX_SHIFT)); - mtk_hsdma_write(hsdma, HSDMA_REG_RST_CFG, - 0x1 << (chan->id + HSDMA_RST_RX_SHIFT)); -} - -static void hsdma_dump_reg(struct mtk_hsdam_engine *hsdma) -{ - dev_dbg(hsdma->ddev.dev, - "tbase %08x, tcnt %08x, tctx %08x, tdtx: %08x, rbase %08x, rcnt %08x, rctx %08x, rdtx %08x\n", - mtk_hsdma_read(hsdma, HSDMA_REG_TX_BASE), - mtk_hsdma_read(hsdma, HSDMA_REG_TX_CNT), - mtk_hsdma_read(hsdma, HSDMA_REG_TX_CTX), - mtk_hsdma_read(hsdma, HSDMA_REG_TX_DTX), - mtk_hsdma_read(hsdma, HSDMA_REG_RX_BASE), - mtk_hsdma_read(hsdma, HSDMA_REG_RX_CNT), - mtk_hsdma_read(hsdma, HSDMA_REG_RX_CRX), - mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX)); - - dev_dbg(hsdma->ddev.dev, - "info %08x, glo %08x, delay %08x, intr_stat %08x, intr_mask %08x\n", - mtk_hsdma_read(hsdma, HSDMA_REG_INFO), - mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG), - mtk_hsdma_read(hsdma, HSDMA_REG_DELAY_INT), - mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS), - mtk_hsdma_read(hsdma, HSDMA_REG_INT_MASK)); -} - -static void hsdma_dump_desc(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - struct hsdma_desc *tx_desc; - struct hsdma_desc *rx_desc; - int i; - - dev_dbg(hsdma->ddev.dev, "tx idx: %d, rx idx: %d\n", - chan->tx_idx, chan->rx_idx); - - for (i = 0; i < HSDMA_DESCS_NUM; i++) { - tx_desc = &chan->tx_ring[i]; - rx_desc = &chan->rx_ring[i]; - - dev_dbg(hsdma->ddev.dev, - "%d tx addr0: %08x, flags %08x, tx addr1: %08x, rx addr0 %08x, flags %08x\n", - i, tx_desc->addr0, tx_desc->flags, - tx_desc->addr1, rx_desc->addr0, rx_desc->flags); - } -} - -static void mtk_hsdma_reset(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - int i; - - /* disable dma */ - mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0); - - /* disable intr */ - mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0); - - /* init desc value */ - for (i = 0; i < HSDMA_DESCS_NUM; i++) { - chan->tx_ring[i].addr0 = 0; - chan->tx_ring[i].flags = HSDMA_DESC_LS0 | HSDMA_DESC_DONE; - } - for (i = 0; i < HSDMA_DESCS_NUM; i++) { - chan->rx_ring[i].addr0 = 0; - chan->rx_ring[i].flags = 0; - } - - /* reset */ - mtk_hsdma_reset_chan(hsdma, chan); - - /* enable intr */ - mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0); - - /* enable dma */ - mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT); -} - -static int mtk_hsdma_terminate_all(struct dma_chan *c) -{ - struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c); - struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan); - unsigned long timeout; - LIST_HEAD(head); - - spin_lock_bh(&chan->vchan.lock); - chan->desc = NULL; - clear_bit(chan->id, &hsdma->chan_issued); - vchan_get_all_descriptors(&chan->vchan, &head); - spin_unlock_bh(&chan->vchan.lock); - - vchan_dma_desc_free_list(&chan->vchan, &head); - - /* wait dma transfer complete */ - timeout = jiffies + msecs_to_jiffies(2000); - while (mtk_hsdma_read(hsdma, HSDMA_REG_GLO_CFG) & - (HSDMA_GLO_RX_BUSY | HSDMA_GLO_TX_BUSY)) { - if (time_after_eq(jiffies, timeout)) { - hsdma_dump_desc(hsdma, chan); - mtk_hsdma_reset(hsdma, chan); - dev_err(hsdma->ddev.dev, "timeout, reset it\n"); - break; - } - cpu_relax(); - } - - return 0; -} - -static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - dma_addr_t src, dst; - size_t len, tlen; - struct hsdma_desc *tx_desc, *rx_desc; - struct mtk_hsdma_sg *sg; - unsigned int i; - int rx_idx; - - sg = &chan->desc->sg[0]; - len = sg->len; - chan->desc->num_sgs = DIV_ROUND_UP(len, HSDMA_MAX_PLEN); - - /* tx desc */ - src = sg->src_addr; - for (i = 0; i < chan->desc->num_sgs; i++) { - tx_desc = &chan->tx_ring[chan->tx_idx]; - - if (len > HSDMA_MAX_PLEN) - tlen = HSDMA_MAX_PLEN; - else - tlen = len; - - if (i & 0x1) { - tx_desc->addr1 = src; - tx_desc->flags |= HSDMA_DESC_PLEN1(tlen); - } else { - tx_desc->addr0 = src; - tx_desc->flags = HSDMA_DESC_PLEN0(tlen); - - /* update index */ - chan->tx_idx = HSDMA_NEXT_DESC(chan->tx_idx); - } - - src += tlen; - len -= tlen; - } - if (i & 0x1) - tx_desc->flags |= HSDMA_DESC_LS0; - else - tx_desc->flags |= HSDMA_DESC_LS1; - - /* rx desc */ - rx_idx = HSDMA_NEXT_DESC(chan->rx_idx); - len = sg->len; - dst = sg->dst_addr; - for (i = 0; i < chan->desc->num_sgs; i++) { - rx_desc = &chan->rx_ring[rx_idx]; - if (len > HSDMA_MAX_PLEN) - tlen = HSDMA_MAX_PLEN; - else - tlen = len; - - rx_desc->addr0 = dst; - rx_desc->flags = HSDMA_DESC_PLEN0(tlen); - - dst += tlen; - len -= tlen; - - /* update index */ - rx_idx = HSDMA_NEXT_DESC(rx_idx); - } - - /* make sure desc and index all up to date */ - wmb(); - mtk_hsdma_write(hsdma, HSDMA_REG_TX_CTX, chan->tx_idx); - - return 0; -} - -static int gdma_next_desc(struct mtk_hsdma_chan *chan) -{ - struct virt_dma_desc *vdesc; - - vdesc = vchan_next_desc(&chan->vchan); - if (!vdesc) { - chan->desc = NULL; - return 0; - } - chan->desc = to_mtk_hsdma_desc(vdesc); - chan->next_sg = 0; - - return 1; -} - -static void mtk_hsdma_chan_done(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - struct mtk_hsdma_desc *desc; - int chan_issued; - - chan_issued = 0; - spin_lock_bh(&chan->vchan.lock); - desc = chan->desc; - if (likely(desc)) { - if (chan->next_sg == desc->num_sgs) { - list_del(&desc->vdesc.node); - vchan_cookie_complete(&desc->vdesc); - chan_issued = gdma_next_desc(chan); - } - } else { - dev_dbg(hsdma->ddev.dev, "no desc to complete\n"); - } - - if (chan_issued) - set_bit(chan->id, &hsdma->chan_issued); - spin_unlock_bh(&chan->vchan.lock); -} - -static irqreturn_t mtk_hsdma_irq(int irq, void *devid) -{ - struct mtk_hsdam_engine *hsdma = devid; - u32 status; - - status = mtk_hsdma_read(hsdma, HSDMA_REG_INT_STATUS); - if (unlikely(!status)) - return IRQ_NONE; - - if (likely(status & HSDMA_INT_RX_Q0)) - tasklet_schedule(&hsdma->task); - else - dev_dbg(hsdma->ddev.dev, "unhandle irq status %08x\n", status); - /* clean intr bits */ - mtk_hsdma_write(hsdma, HSDMA_REG_INT_STATUS, status); - - return IRQ_HANDLED; -} - -static void mtk_hsdma_issue_pending(struct dma_chan *c) -{ - struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c); - struct mtk_hsdam_engine *hsdma = mtk_hsdma_chan_get_dev(chan); - - spin_lock_bh(&chan->vchan.lock); - if (vchan_issue_pending(&chan->vchan) && !chan->desc) { - if (gdma_next_desc(chan)) { - set_bit(chan->id, &hsdma->chan_issued); - tasklet_schedule(&hsdma->task); - } else { - dev_dbg(hsdma->ddev.dev, "no desc to issue\n"); - } - } - spin_unlock_bh(&chan->vchan.lock); -} - -static struct dma_async_tx_descriptor *mtk_hsdma_prep_dma_memcpy( - struct dma_chan *c, dma_addr_t dest, dma_addr_t src, - size_t len, unsigned long flags) -{ - struct mtk_hsdma_chan *chan = to_mtk_hsdma_chan(c); - struct mtk_hsdma_desc *desc; - - if (len <= 0) - return NULL; - - desc = kzalloc(sizeof(*desc), GFP_ATOMIC); - if (!desc) { - dev_err(c->device->dev, "alloc memcpy decs error\n"); - return NULL; - } - - desc->sg[0].src_addr = src; - desc->sg[0].dst_addr = dest; - desc->sg[0].len = len; - - return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); -} - -static enum dma_status mtk_hsdma_tx_status(struct dma_chan *c, - dma_cookie_t cookie, - struct dma_tx_state *state) -{ - return dma_cookie_status(c, cookie, state); -} - -static void mtk_hsdma_free_chan_resources(struct dma_chan *c) -{ - vchan_free_chan_resources(to_virt_chan(c)); -} - -static void mtk_hsdma_desc_free(struct virt_dma_desc *vdesc) -{ - kfree(container_of(vdesc, struct mtk_hsdma_desc, vdesc)); -} - -static void mtk_hsdma_tx(struct mtk_hsdam_engine *hsdma) -{ - struct mtk_hsdma_chan *chan; - - if (test_and_clear_bit(0, &hsdma->chan_issued)) { - chan = &hsdma->chan[0]; - if (chan->desc) - mtk_hsdma_start_transfer(hsdma, chan); - else - dev_dbg(hsdma->ddev.dev, "chan 0 no desc to issue\n"); - } -} - -static void mtk_hsdma_rx(struct mtk_hsdam_engine *hsdma) -{ - struct mtk_hsdma_chan *chan; - int next_idx, drx_idx, cnt; - - chan = &hsdma->chan[0]; - next_idx = HSDMA_NEXT_DESC(chan->rx_idx); - drx_idx = mtk_hsdma_read(hsdma, HSDMA_REG_RX_DRX); - - cnt = (drx_idx - next_idx) & HSDMA_DESCS_MASK; - if (!cnt) - return; - - chan->next_sg += cnt; - chan->rx_idx = (chan->rx_idx + cnt) & HSDMA_DESCS_MASK; - - /* update rx crx */ - wmb(); - mtk_hsdma_write(hsdma, HSDMA_REG_RX_CRX, chan->rx_idx); - - mtk_hsdma_chan_done(hsdma, chan); -} - -static void mtk_hsdma_tasklet(struct tasklet_struct *t) -{ - struct mtk_hsdam_engine *hsdma = from_tasklet(hsdma, t, task); - - mtk_hsdma_rx(hsdma); - mtk_hsdma_tx(hsdma); -} - -static int mtk_hsdam_alloc_desc(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - int i; - - chan->tx_ring = dma_alloc_coherent(hsdma->ddev.dev, - 2 * HSDMA_DESCS_NUM * - sizeof(*chan->tx_ring), - &chan->desc_addr, GFP_ATOMIC | __GFP_ZERO); - if (!chan->tx_ring) - goto no_mem; - - chan->rx_ring = &chan->tx_ring[HSDMA_DESCS_NUM]; - - /* init tx ring value */ - for (i = 0; i < HSDMA_DESCS_NUM; i++) - chan->tx_ring[i].flags = HSDMA_DESC_LS0 | HSDMA_DESC_DONE; - - return 0; -no_mem: - return -ENOMEM; -} - -static void mtk_hsdam_free_desc(struct mtk_hsdam_engine *hsdma, - struct mtk_hsdma_chan *chan) -{ - if (chan->tx_ring) { - dma_free_coherent(hsdma->ddev.dev, - 2 * HSDMA_DESCS_NUM * sizeof(*chan->tx_ring), - chan->tx_ring, chan->desc_addr); - chan->tx_ring = NULL; - chan->rx_ring = NULL; - } -} - -static int mtk_hsdma_init(struct mtk_hsdam_engine *hsdma) -{ - struct mtk_hsdma_chan *chan; - int ret; - u32 reg; - - /* init desc */ - chan = &hsdma->chan[0]; - ret = mtk_hsdam_alloc_desc(hsdma, chan); - if (ret) - return ret; - - /* tx */ - mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, chan->desc_addr); - mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, HSDMA_DESCS_NUM); - /* rx */ - mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, chan->desc_addr + - (sizeof(struct hsdma_desc) * HSDMA_DESCS_NUM)); - mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, HSDMA_DESCS_NUM); - /* reset */ - mtk_hsdma_reset_chan(hsdma, chan); - - /* enable rx intr */ - mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, HSDMA_INT_RX_Q0); - - /* enable dma */ - mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, HSDMA_GLO_DEFAULT); - - /* hardware info */ - reg = mtk_hsdma_read(hsdma, HSDMA_REG_INFO); - dev_info(hsdma->ddev.dev, "rx: %d, tx: %d\n", - (reg >> HSDMA_INFO_RX_SHIFT) & HSDMA_INFO_RX_MASK, - (reg >> HSDMA_INFO_TX_SHIFT) & HSDMA_INFO_TX_MASK); - - hsdma_dump_reg(hsdma); - - return ret; -} - -static void mtk_hsdma_uninit(struct mtk_hsdam_engine *hsdma) -{ - struct mtk_hsdma_chan *chan; - - /* disable dma */ - mtk_hsdma_write(hsdma, HSDMA_REG_GLO_CFG, 0); - - /* disable intr */ - mtk_hsdma_write(hsdma, HSDMA_REG_INT_MASK, 0); - - /* free desc */ - chan = &hsdma->chan[0]; - mtk_hsdam_free_desc(hsdma, chan); - - /* tx */ - mtk_hsdma_write(hsdma, HSDMA_REG_TX_BASE, 0); - mtk_hsdma_write(hsdma, HSDMA_REG_TX_CNT, 0); - /* rx */ - mtk_hsdma_write(hsdma, HSDMA_REG_RX_BASE, 0); - mtk_hsdma_write(hsdma, HSDMA_REG_RX_CNT, 0); - /* reset */ - mtk_hsdma_reset_chan(hsdma, chan); -} - -static const struct of_device_id mtk_hsdma_of_match[] = { - { .compatible = "mediatek,mt7621-hsdma" }, - { }, -}; - -static int mtk_hsdma_probe(struct platform_device *pdev) -{ - const struct of_device_id *match; - struct mtk_hsdma_chan *chan; - struct mtk_hsdam_engine *hsdma; - struct dma_device *dd; - int ret; - int irq; - void __iomem *base; - - ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); - if (ret) - return ret; - - match = of_match_device(mtk_hsdma_of_match, &pdev->dev); - if (!match) - return -EINVAL; - - hsdma = devm_kzalloc(&pdev->dev, sizeof(*hsdma), GFP_KERNEL); - if (!hsdma) - return -EINVAL; - - base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(base)) - return PTR_ERR(base); - hsdma->base = base + HSDMA_BASE_OFFSET; - tasklet_setup(&hsdma->task, mtk_hsdma_tasklet); - - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return -EINVAL; - ret = devm_request_irq(&pdev->dev, irq, mtk_hsdma_irq, - 0, dev_name(&pdev->dev), hsdma); - if (ret) { - dev_err(&pdev->dev, "failed to request irq\n"); - return ret; - } - - device_reset(&pdev->dev); - - dd = &hsdma->ddev; - dma_cap_set(DMA_MEMCPY, dd->cap_mask); - dd->copy_align = HSDMA_ALIGN_SIZE; - dd->device_free_chan_resources = mtk_hsdma_free_chan_resources; - dd->device_prep_dma_memcpy = mtk_hsdma_prep_dma_memcpy; - dd->device_terminate_all = mtk_hsdma_terminate_all; - dd->device_tx_status = mtk_hsdma_tx_status; - dd->device_issue_pending = mtk_hsdma_issue_pending; - dd->dev = &pdev->dev; - dd->dev->dma_parms = &hsdma->dma_parms; - dma_set_max_seg_size(dd->dev, HSDMA_MAX_PLEN); - INIT_LIST_HEAD(&dd->channels); - - chan = &hsdma->chan[0]; - chan->id = 0; - chan->vchan.desc_free = mtk_hsdma_desc_free; - vchan_init(&chan->vchan, dd); - - /* init hardware */ - ret = mtk_hsdma_init(hsdma); - if (ret) { - dev_err(&pdev->dev, "failed to alloc ring descs\n"); - return ret; - } - - ret = dma_async_device_register(dd); - if (ret) { - dev_err(&pdev->dev, "failed to register dma device\n"); - goto err_uninit_hsdma; - } - - ret = of_dma_controller_register(pdev->dev.of_node, - of_dma_xlate_by_chan_id, hsdma); - if (ret) { - dev_err(&pdev->dev, "failed to register of dma controller\n"); - goto err_unregister; - } - - platform_set_drvdata(pdev, hsdma); - - return 0; - -err_unregister: - dma_async_device_unregister(dd); -err_uninit_hsdma: - mtk_hsdma_uninit(hsdma); - return ret; -} - -static int mtk_hsdma_remove(struct platform_device *pdev) -{ - struct mtk_hsdam_engine *hsdma = platform_get_drvdata(pdev); - - mtk_hsdma_uninit(hsdma); - - of_dma_controller_free(pdev->dev.of_node); - dma_async_device_unregister(&hsdma->ddev); - - return 0; -} - -static struct platform_driver mtk_hsdma_driver = { - .probe = mtk_hsdma_probe, - .remove = mtk_hsdma_remove, - .driver = { - .name = KBUILD_MODNAME, - .of_match_table = mtk_hsdma_of_match, - }, -}; -module_platform_driver(mtk_hsdma_driver); - -MODULE_AUTHOR("Michael Lee <igvtee@gmail.com>"); -MODULE_DESCRIPTION("MTK HSDMA driver"); -MODULE_LICENSE("GPL v2"); |