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Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
306 lines
8.9 KiB
C
306 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the NXP SAA7164 PCIe bridge
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*
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* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
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*/
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#include <linux/slab.h>
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#include "saa7164.h"
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/* The PCI address space for buffer handling looks like this:
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*
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* +-u32 wide-------------+
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* | +
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* +-u64 wide------------------------------------+
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* + +
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* +----------------------+
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* | CurrentBufferPtr + Pointer to current PCI buffer >-+
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* +----------------------+ |
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* | Unused + |
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* +----------------------+ |
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* | Pitch + = 188 (bytes) |
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* +----------------------+ |
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* | PCI buffer size + = pitch * number of lines (312) |
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* +----------------------+ |
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* |0| Buf0 Write Offset + |
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* +----------------------+ v
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* |1| Buf1 Write Offset + |
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* +----------------------+ |
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* |2| Buf2 Write Offset + |
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* +----------------------+ |
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* |3| Buf3 Write Offset + |
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* +----------------------+ |
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* ... More write offsets |
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* +---------------------------------------------+ |
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* +0| set of ptrs to PCI pagetables + |
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* +---------------------------------------------+ |
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* +1| set of ptrs to PCI pagetables + <--------+
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* +---------------------------------------------+
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* +2| set of ptrs to PCI pagetables +
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* +---------------------------------------------+
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* +3| set of ptrs to PCI pagetables + >--+
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* +---------------------------------------------+ |
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* ... More buffer pointers | +----------------+
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* +->| pt[0] TS data |
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* | +----------------+
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* |
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* | +----------------+
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* +->| pt[1] TS data |
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* | +----------------+
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* | etc
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*/
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void saa7164_buffer_display(struct saa7164_buffer *buf)
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{
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struct saa7164_dev *dev = buf->port->dev;
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int i;
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dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
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__func__, buf, buf->idx);
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dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n",
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buf->cpu, (long long)buf->dma, buf->pci_size);
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dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
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buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
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/* Format the Page Table Entries to point into the data buffer */
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for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
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dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
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i, buf->pt_cpu, (u64)*(buf->pt_cpu));
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}
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}
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/* Allocate a new buffer structure and associated PCI space in bytes.
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* len must be a multiple of sizeof(u64)
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*/
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struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
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u32 len)
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{
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struct tmHWStreamParameters *params = &port->hw_streamingparams;
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struct saa7164_buffer *buf = NULL;
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struct saa7164_dev *dev = port->dev;
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int i;
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if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
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log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
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goto ret;
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}
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buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf)
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goto ret;
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buf->idx = -1;
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buf->port = port;
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buf->flags = SAA7164_BUFFER_FREE;
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buf->pos = 0;
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buf->actual_size = params->pitch * params->numberoflines;
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buf->crc = 0;
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/* TODO: arg len is being ignored */
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buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
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buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
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/* Allocate contiguous memory */
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buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
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&buf->dma);
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if (!buf->cpu)
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goto fail1;
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buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
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&buf->pt_dma);
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if (!buf->pt_cpu)
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goto fail2;
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/* init the buffers to a known pattern, easier during debugging */
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memset(buf->cpu, 0xff, buf->pci_size);
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buf->crc = crc32(0, buf->cpu, buf->actual_size);
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memset(buf->pt_cpu, 0xff, buf->pt_size);
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dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n",
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__func__, buf, params->numpagetables);
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dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
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buf->cpu, (long)buf->dma, buf->pci_size);
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dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
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buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
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/* Format the Page Table Entries to point into the data buffer */
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for (i = 0 ; i < params->numpagetables; i++) {
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*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
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dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
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i, buf->pt_cpu, (u64)*(buf->pt_cpu));
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}
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goto ret;
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fail2:
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pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
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fail1:
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kfree(buf);
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buf = NULL;
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ret:
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return buf;
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}
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int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
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{
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struct saa7164_dev *dev;
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if (!buf || !buf->port)
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return SAA_ERR_BAD_PARAMETER;
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dev = buf->port->dev;
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dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
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__func__, buf);
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if (buf->flags != SAA7164_BUFFER_FREE)
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log_warn(" freeing a non-free buffer\n");
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pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
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pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
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kfree(buf);
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return SAA_OK;
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}
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int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
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{
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struct saa7164_dev *dev = port->dev;
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if ((i < 0) || (i >= port->hwcfg.buffercount))
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return -EINVAL;
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dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
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saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
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return 0;
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}
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/* Write a buffer into the hardware */
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int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
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{
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struct saa7164_port *port = buf->port;
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struct saa7164_dev *dev = port->dev;
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if ((i < 0) || (i >= port->hwcfg.buffercount))
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return -EINVAL;
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dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
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buf->idx = i; /* Note of which buffer list index position we occupy */
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buf->flags = SAA7164_BUFFER_BUSY;
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buf->pos = 0;
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/* TODO: Review this in light of 32v64 assignments */
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saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
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saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
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saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
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dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
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buf->idx,
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(u64)port->bufoffset + (i * sizeof(u32)),
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saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
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(u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
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(u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
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saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
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saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
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buf->idx);
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return 0;
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}
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int saa7164_buffer_cfg_port(struct saa7164_port *port)
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{
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struct tmHWStreamParameters *params = &port->hw_streamingparams;
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struct saa7164_dev *dev = port->dev;
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struct saa7164_buffer *buf;
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struct list_head *c, *n;
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int i = 0;
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dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
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saa7164_writel(port->bufcounter, 0);
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saa7164_writel(port->pitch, params->pitch);
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saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
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dprintk(DBGLVL_BUF, " configured:\n");
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dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
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dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
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saa7164_readl(port->bufcounter));
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dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
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saa7164_readl(port->pitch));
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dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
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saa7164_readl(port->bufsize));
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dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
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dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
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dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
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dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
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/* Poke the buffers and offsets into PCI space */
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mutex_lock(&port->dmaqueue_lock);
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list_for_each_safe(c, n, &port->dmaqueue.list) {
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buf = list_entry(c, struct saa7164_buffer, list);
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if (buf->flags != SAA7164_BUFFER_FREE)
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BUG();
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/* Place the buffer in the h/w queue */
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saa7164_buffer_activate(buf, i);
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/* Don't exceed the device maximum # bufs */
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if (i++ > port->hwcfg.buffercount)
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BUG();
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}
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mutex_unlock(&port->dmaqueue_lock);
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return 0;
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}
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struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
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u32 len)
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{
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struct saa7164_user_buffer *buf;
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buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf)
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return NULL;
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buf->data = kzalloc(len, GFP_KERNEL);
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if (!buf->data) {
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kfree(buf);
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return NULL;
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}
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buf->actual_size = len;
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buf->pos = 0;
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buf->crc = 0;
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dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
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__func__, buf);
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return buf;
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}
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void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
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{
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if (!buf)
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return;
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kfree(buf->data);
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buf->data = NULL;
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kfree(buf);
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}
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