cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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davinci_voicecodec.c (3281B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * DaVinci Voice Codec Core Interface for TI platforms
      4 *
      5 * Copyright (C) 2010 Texas Instruments, Inc
      6 *
      7 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
      8 */
      9
     10#include <linux/init.h>
     11#include <linux/module.h>
     12#include <linux/device.h>
     13#include <linux/slab.h>
     14#include <linux/delay.h>
     15#include <linux/io.h>
     16#include <linux/clk.h>
     17#include <linux/regmap.h>
     18
     19#include <sound/pcm.h>
     20
     21#include <linux/mfd/davinci_voicecodec.h>
     22
     23static const struct regmap_config davinci_vc_regmap = {
     24	.reg_bits = 32,
     25	.val_bits = 32,
     26};
     27
     28static int __init davinci_vc_probe(struct platform_device *pdev)
     29{
     30	struct davinci_vc *davinci_vc;
     31	struct resource *res;
     32	struct mfd_cell *cell = NULL;
     33	dma_addr_t fifo_base;
     34	int ret;
     35
     36	davinci_vc = devm_kzalloc(&pdev->dev,
     37				  sizeof(struct davinci_vc), GFP_KERNEL);
     38	if (!davinci_vc)
     39		return -ENOMEM;
     40
     41	davinci_vc->clk = devm_clk_get(&pdev->dev, NULL);
     42	if (IS_ERR(davinci_vc->clk)) {
     43		dev_dbg(&pdev->dev,
     44			    "could not get the clock for voice codec\n");
     45		return -ENODEV;
     46	}
     47	clk_enable(davinci_vc->clk);
     48
     49	davinci_vc->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
     50	if (IS_ERR(davinci_vc->base)) {
     51		ret = PTR_ERR(davinci_vc->base);
     52		goto fail;
     53	}
     54	fifo_base = (dma_addr_t)res->start;
     55
     56	davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
     57						   davinci_vc->base,
     58						   &davinci_vc_regmap);
     59	if (IS_ERR(davinci_vc->regmap)) {
     60		ret = PTR_ERR(davinci_vc->regmap);
     61		goto fail;
     62	}
     63
     64	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
     65	if (!res) {
     66		dev_err(&pdev->dev, "no DMA resource\n");
     67		ret = -ENXIO;
     68		goto fail;
     69	}
     70
     71	davinci_vc->davinci_vcif.dma_tx_channel = res->start;
     72	davinci_vc->davinci_vcif.dma_tx_addr = fifo_base + DAVINCI_VC_WFIFO;
     73
     74	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
     75	if (!res) {
     76		dev_err(&pdev->dev, "no DMA resource\n");
     77		ret = -ENXIO;
     78		goto fail;
     79	}
     80
     81	davinci_vc->davinci_vcif.dma_rx_channel = res->start;
     82	davinci_vc->davinci_vcif.dma_rx_addr = fifo_base + DAVINCI_VC_RFIFO;
     83
     84	davinci_vc->dev = &pdev->dev;
     85	davinci_vc->pdev = pdev;
     86
     87	/* Voice codec interface client */
     88	cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
     89	cell->name = "davinci-vcif";
     90	cell->platform_data = davinci_vc;
     91	cell->pdata_size = sizeof(*davinci_vc);
     92
     93	/* Voice codec CQ93VC client */
     94	cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
     95	cell->name = "cq93vc-codec";
     96	cell->platform_data = davinci_vc;
     97	cell->pdata_size = sizeof(*davinci_vc);
     98
     99	ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
    100			      DAVINCI_VC_CELLS, NULL, 0, NULL);
    101	if (ret != 0) {
    102		dev_err(&pdev->dev, "fail to register client devices\n");
    103		goto fail;
    104	}
    105
    106	return 0;
    107
    108fail:
    109	clk_disable(davinci_vc->clk);
    110
    111	return ret;
    112}
    113
    114static int davinci_vc_remove(struct platform_device *pdev)
    115{
    116	struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
    117
    118	mfd_remove_devices(&pdev->dev);
    119
    120	clk_disable(davinci_vc->clk);
    121
    122	return 0;
    123}
    124
    125static struct platform_driver davinci_vc_driver = {
    126	.driver	= {
    127		.name = "davinci_voicecodec",
    128	},
    129	.remove	= davinci_vc_remove,
    130};
    131
    132module_platform_driver_probe(davinci_vc_driver, davinci_vc_probe);
    133
    134MODULE_AUTHOR("Miguel Aguilar");
    135MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
    136MODULE_LICENSE("GPL");