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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/musb/tusb6010_omap.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/musb/tusb6010_omap.c')
-rw-r--r-- | drivers/usb/musb/tusb6010_omap.c | 642 |
1 files changed, 642 insertions, 0 deletions
diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c new file mode 100644 index 000000000..60a93b8bb --- /dev/null +++ b/drivers/usb/musb/tusb6010_omap.c @@ -0,0 +1,642 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * TUSB6010 USB 2.0 OTG Dual Role controller OMAP DMA interface + * + * Copyright (C) 2006 Nokia Corporation + * Tony Lindgren <tony@atomide.com> + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/usb.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> + +#include "musb_core.h" +#include "tusb6010.h" + +#define to_chdat(c) ((struct tusb_omap_dma_ch *)(c)->private_data) + +#define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */ + +struct tusb_dma_data { + s8 dmareq; + struct dma_chan *chan; +}; + +struct tusb_omap_dma_ch { + struct musb *musb; + void __iomem *tbase; + unsigned long phys_offset; + int epnum; + u8 tx; + struct musb_hw_ep *hw_ep; + + struct tusb_dma_data *dma_data; + + struct tusb_omap_dma *tusb_dma; + + dma_addr_t dma_addr; + + u32 len; + u16 packet_sz; + u16 transfer_packet_sz; + u32 transfer_len; + u32 completed_len; +}; + +struct tusb_omap_dma { + struct dma_controller controller; + void __iomem *tbase; + + struct tusb_dma_data dma_pool[MAX_DMAREQ]; + unsigned multichannel:1; +}; + +/* + * Allocate dmareq0 to the current channel unless it's already taken + */ +static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat) +{ + u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); + + if (reg != 0) { + dev_dbg(chdat->musb->controller, "ep%i dmareq0 is busy for ep%i\n", + chdat->epnum, reg & 0xf); + return -EAGAIN; + } + + if (chdat->tx) + reg = (1 << 4) | chdat->epnum; + else + reg = chdat->epnum; + + musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); + + return 0; +} + +static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat) +{ + u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); + + if ((reg & 0xf) != chdat->epnum) { + printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n", + chdat->epnum, reg & 0xf); + return; + } + musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0); +} + +/* + * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in + * musb_gadget.c. + */ +static void tusb_omap_dma_cb(void *data) +{ + struct dma_channel *channel = (struct dma_channel *)data; + struct tusb_omap_dma_ch *chdat = to_chdat(channel); + struct tusb_omap_dma *tusb_dma = chdat->tusb_dma; + struct musb *musb = chdat->musb; + struct device *dev = musb->controller; + struct musb_hw_ep *hw_ep = chdat->hw_ep; + void __iomem *ep_conf = hw_ep->conf; + void __iomem *mbase = musb->mregs; + unsigned long remaining, flags, pio; + + spin_lock_irqsave(&musb->lock, flags); + + dev_dbg(musb->controller, "ep%i %s dma callback\n", + chdat->epnum, chdat->tx ? "tx" : "rx"); + + if (chdat->tx) + remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET); + else + remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET); + + remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining); + + /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */ + if (unlikely(remaining > chdat->transfer_len)) { + dev_dbg(musb->controller, "Corrupt %s XFR_SIZE: 0x%08lx\n", + chdat->tx ? "tx" : "rx", remaining); + remaining = 0; + } + + channel->actual_len = chdat->transfer_len - remaining; + pio = chdat->len - channel->actual_len; + + dev_dbg(musb->controller, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len); + + /* Transfer remaining 1 - 31 bytes */ + if (pio > 0 && pio < 32) { + u8 *buf; + + dev_dbg(musb->controller, "Using PIO for remaining %lu bytes\n", pio); + buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len; + if (chdat->tx) { + dma_unmap_single(dev, chdat->dma_addr, + chdat->transfer_len, + DMA_TO_DEVICE); + musb_write_fifo(hw_ep, pio, buf); + } else { + dma_unmap_single(dev, chdat->dma_addr, + chdat->transfer_len, + DMA_FROM_DEVICE); + musb_read_fifo(hw_ep, pio, buf); + } + channel->actual_len += pio; + } + + if (!tusb_dma->multichannel) + tusb_omap_free_shared_dmareq(chdat); + + channel->status = MUSB_DMA_STATUS_FREE; + + musb_dma_completion(musb, chdat->epnum, chdat->tx); + + /* We must terminate short tx transfers manually by setting TXPKTRDY. + * REVISIT: This same problem may occur with other MUSB dma as well. + * Easy to test with g_ether by pinging the MUSB board with ping -s54. + */ + if ((chdat->transfer_len < chdat->packet_sz) + || (chdat->transfer_len % chdat->packet_sz != 0)) { + u16 csr; + + if (chdat->tx) { + dev_dbg(musb->controller, "terminating short tx packet\n"); + musb_ep_select(mbase, chdat->epnum); + csr = musb_readw(hw_ep->regs, MUSB_TXCSR); + csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY + | MUSB_TXCSR_P_WZC_BITS; + musb_writew(hw_ep->regs, MUSB_TXCSR, csr); + } + } + + spin_unlock_irqrestore(&musb->lock, flags); +} + +static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz, + u8 rndis_mode, dma_addr_t dma_addr, u32 len) +{ + struct tusb_omap_dma_ch *chdat = to_chdat(channel); + struct tusb_omap_dma *tusb_dma = chdat->tusb_dma; + struct musb *musb = chdat->musb; + struct device *dev = musb->controller; + struct musb_hw_ep *hw_ep = chdat->hw_ep; + void __iomem *mbase = musb->mregs; + void __iomem *ep_conf = hw_ep->conf; + dma_addr_t fifo_addr = hw_ep->fifo_sync; + u32 dma_remaining; + u16 csr; + u32 psize; + struct tusb_dma_data *dma_data; + struct dma_async_tx_descriptor *dma_desc; + struct dma_slave_config dma_cfg; + enum dma_transfer_direction dma_dir; + u32 port_window; + int ret; + + if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz)) + return false; + + /* + * HW issue #10: Async dma will eventually corrupt the XFR_SIZE + * register which will cause missed DMA interrupt. We could try to + * use a timer for the callback, but it is unsafe as the XFR_SIZE + * register is corrupt, and we won't know if the DMA worked. + */ + if (dma_addr & 0x2) + return false; + + /* + * Because of HW issue #10, it seems like mixing sync DMA and async + * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before + * using the channel for DMA. + */ + if (chdat->tx) + dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET); + else + dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET); + + dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining); + if (dma_remaining) { + dev_dbg(musb->controller, "Busy %s dma, not using: %08x\n", + chdat->tx ? "tx" : "rx", dma_remaining); + return false; + } + + chdat->transfer_len = len & ~0x1f; + + if (len < packet_sz) + chdat->transfer_packet_sz = chdat->transfer_len; + else + chdat->transfer_packet_sz = packet_sz; + + dma_data = chdat->dma_data; + if (!tusb_dma->multichannel) { + if (tusb_omap_use_shared_dmareq(chdat) != 0) { + dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum); + return false; + } + if (dma_data->dmareq < 0) { + /* REVISIT: This should get blocked earlier, happens + * with MSC ErrorRecoveryTest + */ + WARN_ON(1); + return false; + } + } + + chdat->packet_sz = packet_sz; + chdat->len = len; + channel->actual_len = 0; + chdat->dma_addr = dma_addr; + channel->status = MUSB_DMA_STATUS_BUSY; + + /* Since we're recycling dma areas, we need to clean or invalidate */ + if (chdat->tx) { + dma_dir = DMA_MEM_TO_DEV; + dma_map_single(dev, phys_to_virt(dma_addr), len, + DMA_TO_DEVICE); + } else { + dma_dir = DMA_DEV_TO_MEM; + dma_map_single(dev, phys_to_virt(dma_addr), len, + DMA_FROM_DEVICE); + } + + memset(&dma_cfg, 0, sizeof(dma_cfg)); + + /* Use 16-bit transfer if dma_addr is not 32-bit aligned */ + if ((dma_addr & 0x3) == 0) { + dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + port_window = 8; + } else { + dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + port_window = 16; + + fifo_addr = hw_ep->fifo_async; + } + + dev_dbg(musb->controller, + "ep%i %s dma: %pad len: %u(%u) packet_sz: %i(%i)\n", + chdat->epnum, chdat->tx ? "tx" : "rx", &dma_addr, + chdat->transfer_len, len, chdat->transfer_packet_sz, packet_sz); + + dma_cfg.src_addr = fifo_addr; + dma_cfg.dst_addr = fifo_addr; + dma_cfg.src_port_window_size = port_window; + dma_cfg.src_maxburst = port_window; + dma_cfg.dst_port_window_size = port_window; + dma_cfg.dst_maxburst = port_window; + + ret = dmaengine_slave_config(dma_data->chan, &dma_cfg); + if (ret) { + dev_err(musb->controller, "DMA slave config failed: %d\n", ret); + return false; + } + + dma_desc = dmaengine_prep_slave_single(dma_data->chan, dma_addr, + chdat->transfer_len, dma_dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!dma_desc) { + dev_err(musb->controller, "DMA prep_slave_single failed\n"); + return false; + } + + dma_desc->callback = tusb_omap_dma_cb; + dma_desc->callback_param = channel; + dmaengine_submit(dma_desc); + + dev_dbg(musb->controller, + "ep%i %s using %i-bit %s dma from %pad to %pad\n", + chdat->epnum, chdat->tx ? "tx" : "rx", + dma_cfg.src_addr_width * 8, + ((dma_addr & 0x3) == 0) ? "sync" : "async", + (dma_dir == DMA_MEM_TO_DEV) ? &dma_addr : &fifo_addr, + (dma_dir == DMA_MEM_TO_DEV) ? &fifo_addr : &dma_addr); + + /* + * Prepare MUSB for DMA transfer + */ + musb_ep_select(mbase, chdat->epnum); + if (chdat->tx) { + csr = musb_readw(hw_ep->regs, MUSB_TXCSR); + csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB + | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE); + csr &= ~MUSB_TXCSR_P_UNDERRUN; + musb_writew(hw_ep->regs, MUSB_TXCSR, csr); + } else { + csr = musb_readw(hw_ep->regs, MUSB_RXCSR); + csr |= MUSB_RXCSR_DMAENAB; + csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE); + musb_writew(hw_ep->regs, MUSB_RXCSR, + csr | MUSB_RXCSR_P_WZC_BITS); + } + + /* Start DMA transfer */ + dma_async_issue_pending(dma_data->chan); + + if (chdat->tx) { + /* Send transfer_packet_sz packets at a time */ + psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET); + psize &= ~0x7ff; + psize |= chdat->transfer_packet_sz; + musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize); + + musb_writel(ep_conf, TUSB_EP_TX_OFFSET, + TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len)); + } else { + /* Receive transfer_packet_sz packets at a time */ + psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET); + psize &= ~(0x7ff << 16); + psize |= (chdat->transfer_packet_sz << 16); + musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize); + + musb_writel(ep_conf, TUSB_EP_RX_OFFSET, + TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len)); + } + + return true; +} + +static int tusb_omap_dma_abort(struct dma_channel *channel) +{ + struct tusb_omap_dma_ch *chdat = to_chdat(channel); + + if (chdat->dma_data) + dmaengine_terminate_all(chdat->dma_data->chan); + + channel->status = MUSB_DMA_STATUS_FREE; + + return 0; +} + +static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat) +{ + u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); + int i, dmareq_nr = -1; + + for (i = 0; i < MAX_DMAREQ; i++) { + int cur = (reg & (0xf << (i * 5))) >> (i * 5); + if (cur == 0) { + dmareq_nr = i; + break; + } + } + + if (dmareq_nr == -1) + return -EAGAIN; + + reg |= (chdat->epnum << (dmareq_nr * 5)); + if (chdat->tx) + reg |= ((1 << 4) << (dmareq_nr * 5)); + musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); + + chdat->dma_data = &chdat->tusb_dma->dma_pool[dmareq_nr]; + + return 0; +} + +static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat) +{ + u32 reg; + + if (!chdat || !chdat->dma_data || chdat->dma_data->dmareq < 0) + return; + + reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); + reg &= ~(0x1f << (chdat->dma_data->dmareq * 5)); + musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); + + chdat->dma_data = NULL; +} + +static struct dma_channel *dma_channel_pool[MAX_DMAREQ]; + +static struct dma_channel * +tusb_omap_dma_allocate(struct dma_controller *c, + struct musb_hw_ep *hw_ep, + u8 tx) +{ + int ret, i; + struct tusb_omap_dma *tusb_dma; + struct musb *musb; + struct dma_channel *channel = NULL; + struct tusb_omap_dma_ch *chdat = NULL; + struct tusb_dma_data *dma_data = NULL; + + tusb_dma = container_of(c, struct tusb_omap_dma, controller); + musb = tusb_dma->controller.musb; + + /* REVISIT: Why does dmareq5 not work? */ + if (hw_ep->epnum == 0) { + dev_dbg(musb->controller, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx"); + return NULL; + } + + for (i = 0; i < MAX_DMAREQ; i++) { + struct dma_channel *ch = dma_channel_pool[i]; + if (ch->status == MUSB_DMA_STATUS_UNKNOWN) { + ch->status = MUSB_DMA_STATUS_FREE; + channel = ch; + chdat = ch->private_data; + break; + } + } + + if (!channel) + return NULL; + + chdat->musb = tusb_dma->controller.musb; + chdat->tbase = tusb_dma->tbase; + chdat->hw_ep = hw_ep; + chdat->epnum = hw_ep->epnum; + chdat->completed_len = 0; + chdat->tusb_dma = tusb_dma; + if (tx) + chdat->tx = 1; + else + chdat->tx = 0; + + channel->max_len = 0x7fffffff; + channel->desired_mode = 0; + channel->actual_len = 0; + + if (!chdat->dma_data) { + if (tusb_dma->multichannel) { + ret = tusb_omap_dma_allocate_dmareq(chdat); + if (ret != 0) + goto free_dmareq; + } else { + chdat->dma_data = &tusb_dma->dma_pool[0]; + } + } + + dma_data = chdat->dma_data; + + dev_dbg(musb->controller, "ep%i %s dma: %s dmareq%i\n", + chdat->epnum, + chdat->tx ? "tx" : "rx", + tusb_dma->multichannel ? "shared" : "dedicated", + dma_data->dmareq); + + return channel; + +free_dmareq: + tusb_omap_dma_free_dmareq(chdat); + + dev_dbg(musb->controller, "ep%i: Could not get a DMA channel\n", chdat->epnum); + channel->status = MUSB_DMA_STATUS_UNKNOWN; + + return NULL; +} + +static void tusb_omap_dma_release(struct dma_channel *channel) +{ + struct tusb_omap_dma_ch *chdat = to_chdat(channel); + struct musb *musb = chdat->musb; + + dev_dbg(musb->controller, "Release for ep%i\n", chdat->epnum); + + channel->status = MUSB_DMA_STATUS_UNKNOWN; + + dmaengine_terminate_sync(chdat->dma_data->chan); + tusb_omap_dma_free_dmareq(chdat); + + channel = NULL; +} + +void tusb_dma_controller_destroy(struct dma_controller *c) +{ + struct tusb_omap_dma *tusb_dma; + int i; + + tusb_dma = container_of(c, struct tusb_omap_dma, controller); + for (i = 0; i < MAX_DMAREQ; i++) { + struct dma_channel *ch = dma_channel_pool[i]; + if (ch) { + kfree(ch->private_data); + kfree(ch); + } + + /* Free up the DMA channels */ + if (tusb_dma && tusb_dma->dma_pool[i].chan) + dma_release_channel(tusb_dma->dma_pool[i].chan); + } + + kfree(tusb_dma); +} +EXPORT_SYMBOL_GPL(tusb_dma_controller_destroy); + +static int tusb_omap_allocate_dma_pool(struct tusb_omap_dma *tusb_dma) +{ + struct musb *musb = tusb_dma->controller.musb; + int i; + int ret = 0; + + for (i = 0; i < MAX_DMAREQ; i++) { + struct tusb_dma_data *dma_data = &tusb_dma->dma_pool[i]; + + /* + * Request DMA channels: + * - one channel in case of non multichannel mode + * - MAX_DMAREQ number of channels in multichannel mode + */ + if (i == 0 || tusb_dma->multichannel) { + char ch_name[8]; + + sprintf(ch_name, "dmareq%d", i); + dma_data->chan = dma_request_chan(musb->controller, + ch_name); + if (IS_ERR(dma_data->chan)) { + dev_err(musb->controller, + "Failed to request %s\n", ch_name); + ret = PTR_ERR(dma_data->chan); + goto dma_error; + } + + dma_data->dmareq = i; + } else { + dma_data->dmareq = -1; + } + } + + return 0; + +dma_error: + for (; i >= 0; i--) { + struct tusb_dma_data *dma_data = &tusb_dma->dma_pool[i]; + + if (dma_data->dmareq >= 0) + dma_release_channel(dma_data->chan); + } + + return ret; +} + +struct dma_controller * +tusb_dma_controller_create(struct musb *musb, void __iomem *base) +{ + void __iomem *tbase = musb->ctrl_base; + struct tusb_omap_dma *tusb_dma; + int i; + + /* REVISIT: Get dmareq lines used from board-*.c */ + + musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff); + musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0); + + musb_writel(tbase, TUSB_DMA_REQ_CONF, + TUSB_DMA_REQ_CONF_BURST_SIZE(2) + | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f) + | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2)); + + tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL); + if (!tusb_dma) + goto out; + + tusb_dma->controller.musb = musb; + tusb_dma->tbase = musb->ctrl_base; + + tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate; + tusb_dma->controller.channel_release = tusb_omap_dma_release; + tusb_dma->controller.channel_program = tusb_omap_dma_program; + tusb_dma->controller.channel_abort = tusb_omap_dma_abort; + + if (musb->tusb_revision >= TUSB_REV_30) + tusb_dma->multichannel = 1; + + for (i = 0; i < MAX_DMAREQ; i++) { + struct dma_channel *ch; + struct tusb_omap_dma_ch *chdat; + + ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL); + if (!ch) + goto cleanup; + + dma_channel_pool[i] = ch; + + chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL); + if (!chdat) + goto cleanup; + + ch->status = MUSB_DMA_STATUS_UNKNOWN; + ch->private_data = chdat; + } + + if (tusb_omap_allocate_dma_pool(tusb_dma)) + goto cleanup; + + return &tusb_dma->controller; + +cleanup: + musb_dma_controller_destroy(&tusb_dma->controller); +out: + return NULL; +} +EXPORT_SYMBOL_GPL(tusb_dma_controller_create); |