// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the NXP SAA7164 PCIe bridge * * Copyright (c) 2010-2015 Steven Toth */ #include #include "saa7164.h" /* The PCI address space for buffer handling looks like this: * * +-u32 wide-------------+ * | + * +-u64 wide------------------------------------+ * + + * +----------------------+ * | CurrentBufferPtr + Pointer to current PCI buffer >-+ * +----------------------+ | * | Unused + | * +----------------------+ | * | Pitch + = 188 (bytes) | * +----------------------+ | * | PCI buffer size + = pitch * number of lines (312) | * +----------------------+ | * |0| Buf0 Write Offset + | * +----------------------+ v * |1| Buf1 Write Offset + | * +----------------------+ | * |2| Buf2 Write Offset + | * +----------------------+ | * |3| Buf3 Write Offset + | * +----------------------+ | * ... More write offsets | * +---------------------------------------------+ | * +0| set of ptrs to PCI pagetables + | * +---------------------------------------------+ | * +1| set of ptrs to PCI pagetables + <--------+ * +---------------------------------------------+ * +2| set of ptrs to PCI pagetables + * +---------------------------------------------+ * +3| set of ptrs to PCI pagetables + >--+ * +---------------------------------------------+ | * ... More buffer pointers | +----------------+ * +->| pt[0] TS data | * | +----------------+ * | * | +----------------+ * +->| pt[1] TS data | * | +----------------+ * | etc */ void saa7164_buffer_display(struct saa7164_buffer *buf) { struct saa7164_dev *dev = buf->port->dev; int i; dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n", __func__, buf, buf->idx); dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n", buf->cpu, (long long)buf->dma, buf->pci_size); dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n", buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size); /* Format the Page Table Entries to point into the data buffer */ for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) { dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n", i, buf->pt_cpu, (u64)*(buf->pt_cpu)); } } /* Allocate a new buffer structure and associated PCI space in bytes. * len must be a multiple of sizeof(u64) */ struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port, u32 len) { struct tmHWStreamParameters *params = &port->hw_streamingparams; struct saa7164_buffer *buf = NULL; struct saa7164_dev *dev = port->dev; int i; if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) { log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__); goto ret; } buf = kzalloc(sizeof(*buf), GFP_KERNEL); if (!buf) goto ret; buf->idx = -1; buf->port = port; buf->flags = SAA7164_BUFFER_FREE; buf->pos = 0; buf->actual_size = params->pitch * params->numberoflines; buf->crc = 0; /* TODO: arg len is being ignored */ buf->pci_size = SAA7164_PT_ENTRIES * 0x1000; buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000; /* Allocate contiguous memory */ buf->cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pci_size, &buf->dma, GFP_KERNEL); if (!buf->cpu) goto fail1; buf->pt_cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pt_size, &buf->pt_dma, GFP_KERNEL); if (!buf->pt_cpu) goto fail2; /* init the buffers to a known pattern, easier during debugging */ memset(buf->cpu, 0xff, buf->pci_size); buf->crc = crc32(0, buf->cpu, buf->actual_size); memset(buf->pt_cpu, 0xff, buf->pt_size); dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n", __func__, buf, params->numpagetables); dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n", buf->cpu, (long)buf->dma, buf->pci_size); dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n", buf->pt_cpu, (long)buf->pt_dma, buf->pt_size); /* Format the Page Table Entries to point into the data buffer */ for (i = 0 ; i < params->numpagetables; i++) { *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */ dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n", i, buf->pt_cpu, (u64)*(buf->pt_cpu)); } goto ret; fail2: dma_free_coherent(&port->dev->pci->dev, buf->pci_size, buf->cpu, buf->dma); fail1: kfree(buf); buf = NULL; ret: return buf; } int saa7164_buffer_dealloc(struct saa7164_buffer *buf) { struct saa7164_dev *dev; if (!buf || !buf->port) return SAA_ERR_BAD_PARAMETER; dev = buf->port->dev; dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", __func__, buf); if (buf->flags != SAA7164_BUFFER_FREE) log_warn(" freeing a non-free buffer\n"); dma_free_coherent(&dev->pci->dev, buf->pci_size, buf->cpu, buf->dma); dma_free_coherent(&dev->pci->dev, buf->pt_size, buf->pt_cpu, buf->pt_dma); kfree(buf); return SAA_OK; } int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i) { struct saa7164_dev *dev = port->dev; if ((i < 0) || (i >= port->hwcfg.buffercount)) return -EINVAL; dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); return 0; } /* Write a buffer into the hardware */ int saa7164_buffer_activate(struct saa7164_buffer *buf, int i) { struct saa7164_port *port = buf->port; struct saa7164_dev *dev = port->dev; if ((i < 0) || (i >= port->hwcfg.buffercount)) return -EINVAL; dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); buf->idx = i; /* Note of which buffer list index position we occupy */ buf->flags = SAA7164_BUFFER_BUSY; buf->pos = 0; /* TODO: Review this in light of 32v64 assignments */ saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma); saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0); dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n", buf->idx, (u64)port->bufoffset + (i * sizeof(u32)), saa7164_readl(port->bufoffset + (sizeof(u32) * i)), (u64)port->bufptr32h + ((sizeof(u32) * 2) * i), (u64)port->bufptr32l + ((sizeof(u32) * 2) * i), saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)), saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)), buf->idx); return 0; } int saa7164_buffer_cfg_port(struct saa7164_port *port) { struct tmHWStreamParameters *params = &port->hw_streamingparams; struct saa7164_dev *dev = port->dev; struct saa7164_buffer *buf; struct list_head *c, *n; int i = 0; dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr); saa7164_writel(port->bufcounter, 0); saa7164_writel(port->pitch, params->pitch); saa7164_writel(port->bufsize, params->pitch * params->numberoflines); dprintk(DBGLVL_BUF, " configured:\n"); dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio); dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter, saa7164_readl(port->bufcounter)); dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch, saa7164_readl(port->pitch)); dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize, saa7164_readl(port->bufsize)); dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount); dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset); dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h); dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l); /* Poke the buffers and offsets into PCI space */ mutex_lock(&port->dmaqueue_lock); list_for_each_safe(c, n, &port->dmaqueue.list) { buf = list_entry(c, struct saa7164_buffer, list); BUG_ON(buf->flags != SAA7164_BUFFER_FREE); /* Place the buffer in the h/w queue */ saa7164_buffer_activate(buf, i); /* Don't exceed the device maximum # bufs */ BUG_ON(i > port->hwcfg.buffercount); i++; } mutex_unlock(&port->dmaqueue_lock); return 0; } struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, u32 len) { struct saa7164_user_buffer *buf; buf = kzalloc(sizeof(*buf), GFP_KERNEL); if (!buf) return NULL; buf->data = kzalloc(len, GFP_KERNEL); if (!buf->data) { kfree(buf); return NULL; } buf->actual_size = len; buf->pos = 0; buf->crc = 0; dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n", __func__, buf); return buf; } void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf) { if (!buf) return; kfree(buf->data); buf->data = NULL; kfree(buf); }