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1// SPDX-License-Identifier: GPL-2.02//3// loongson_i2s_pci.c -- Loongson I2S controller driver4//5// Copyright (C) 2023 Loongson Technology Corporation Limited6// Author: Yingkun Meng <mengyingkun@loongson.cn>7//8 9#include <linux/module.h>10#include <linux/delay.h>11#include <linux/pm_runtime.h>12#include <linux/dma-mapping.h>13#include <linux/acpi.h>14#include <linux/pci.h>15#include <sound/soc.h>16#include "loongson_i2s.h"17#include "loongson_dma.h"18 19static bool loongson_i2s_wr_reg(struct device *dev, unsigned int reg)20{21 switch (reg) {22 case LS_I2S_CFG:23 case LS_I2S_CTRL:24 case LS_I2S_RX_DATA:25 case LS_I2S_TX_DATA:26 case LS_I2S_CFG1:27 return true;28 default:29 return false;30 };31}32 33static bool loongson_i2s_rd_reg(struct device *dev, unsigned int reg)34{35 switch (reg) {36 case LS_I2S_VER:37 case LS_I2S_CFG:38 case LS_I2S_CTRL:39 case LS_I2S_RX_DATA:40 case LS_I2S_TX_DATA:41 case LS_I2S_CFG1:42 return true;43 default:44 return false;45 };46}47 48static bool loongson_i2s_volatile_reg(struct device *dev, unsigned int reg)49{50 switch (reg) {51 case LS_I2S_CFG:52 case LS_I2S_CTRL:53 case LS_I2S_RX_DATA:54 case LS_I2S_TX_DATA:55 case LS_I2S_CFG1:56 return true;57 default:58 return false;59 };60}61 62static const struct regmap_config loongson_i2s_regmap_config = {63 .reg_bits = 32,64 .reg_stride = 4,65 .val_bits = 32,66 .max_register = LS_I2S_CFG1,67 .writeable_reg = loongson_i2s_wr_reg,68 .readable_reg = loongson_i2s_rd_reg,69 .volatile_reg = loongson_i2s_volatile_reg,70 .cache_type = REGCACHE_FLAT,71};72 73static int loongson_i2s_pci_probe(struct pci_dev *pdev,74 const struct pci_device_id *pid)75{76 const struct fwnode_handle *fwnode = pdev->dev.fwnode;77 struct loongson_dma_data *tx_data, *rx_data;78 struct device *dev = &pdev->dev;79 struct loongson_i2s *i2s;80 int ret;81 82 if (pcim_enable_device(pdev)) {83 dev_err(dev, "pci_enable_device failed\n");84 return -ENODEV;85 }86 87 i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);88 if (!i2s)89 return -ENOMEM;90 91 i2s->rev_id = pdev->revision;92 i2s->dev = dev;93 pci_set_drvdata(pdev, i2s);94 95 ret = pcim_iomap_regions(pdev, 1 << 0, dev_name(dev));96 if (ret < 0) {97 dev_err(dev, "iomap_regions failed\n");98 return ret;99 }100 101 i2s->reg_base = pcim_iomap_table(pdev)[0];102 i2s->regmap = devm_regmap_init_mmio(dev, i2s->reg_base,103 &loongson_i2s_regmap_config);104 if (IS_ERR(i2s->regmap))105 return dev_err_probe(dev, PTR_ERR(i2s->regmap), "regmap_init_mmio failed\n");106 107 tx_data = &i2s->tx_dma_data;108 rx_data = &i2s->rx_dma_data;109 110 tx_data->dev_addr = pci_resource_start(pdev, 0) + LS_I2S_TX_DATA;111 tx_data->order_addr = i2s->reg_base + LS_I2S_TX_ORDER;112 113 rx_data->dev_addr = pci_resource_start(pdev, 0) + LS_I2S_RX_DATA;114 rx_data->order_addr = i2s->reg_base + LS_I2S_RX_ORDER;115 116 tx_data->irq = fwnode_irq_get_byname(fwnode, "tx");117 if (tx_data->irq < 0)118 return dev_err_probe(dev, tx_data->irq, "dma tx irq invalid\n");119 120 rx_data->irq = fwnode_irq_get_byname(fwnode, "rx");121 if (rx_data->irq < 0)122 return dev_err_probe(dev, rx_data->irq, "dma rx irq invalid\n");123 124 ret = device_property_read_u32(dev, "clock-frequency", &i2s->clk_rate);125 if (ret)126 return dev_err_probe(dev, ret, "clock-frequency property invalid\n");127 128 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));129 130 if (i2s->rev_id == 1) {131 regmap_write(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_RESET);132 udelay(200);133 }134 135 ret = devm_snd_soc_register_component(dev, &loongson_i2s_component,136 &loongson_i2s_dai, 1);137 if (ret)138 return dev_err_probe(dev, ret, "register DAI failed\n");139 140 return 0;141}142 143static const struct pci_device_id loongson_i2s_ids[] = {144 { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a27) },145 { },146};147MODULE_DEVICE_TABLE(pci, loongson_i2s_ids);148 149static struct pci_driver loongson_i2s_driver = {150 .name = "loongson-i2s-pci",151 .id_table = loongson_i2s_ids,152 .probe = loongson_i2s_pci_probe,153 .driver = {154 .pm = pm_sleep_ptr(&loongson_i2s_pm),155 },156};157module_pci_driver(loongson_i2s_driver);158 159MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");160MODULE_AUTHOR("Loongson Technology Corporation Limited");161MODULE_LICENSE("GPL");162