1 // SPDX-License-Identifier: GPL-2.0
3 // loongson_i2s_pci.c -- Loongson I2S controller driver
5 // Copyright (C) 2023 Loongson Technology Corporation Limited
6 // Author: Yingkun Meng <mengyingkun@loongson.cn>
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"
19 static bool loongson_i2s_wr_reg(struct device *dev, unsigned int reg)
33 static bool loongson_i2s_rd_reg(struct device *dev, unsigned int reg)
48 static bool loongson_i2s_volatile_reg(struct device *dev, unsigned int reg)
62 static const struct regmap_config loongson_i2s_regmap_config = {
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,
73 static int loongson_i2s_pci_probe(struct pci_dev *pdev,
74 const struct pci_device_id *pid)
76 const struct fwnode_handle *fwnode = pdev->dev.fwnode;
77 struct loongson_dma_data *tx_data, *rx_data;
78 struct loongson_i2s *i2s;
81 if (pcim_enable_device(pdev)) {
82 dev_err(&pdev->dev, "pci_enable_device failed\n");
86 i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
90 i2s->rev_id = pdev->revision;
91 i2s->dev = &pdev->dev;
92 pci_set_drvdata(pdev, i2s);
94 ret = pcim_iomap_regions(pdev, 1 << 0, dev_name(&pdev->dev));
96 dev_err(&pdev->dev, "iomap_regions failed\n");
99 i2s->reg_base = pcim_iomap_table(pdev)[0];
100 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->reg_base,
101 &loongson_i2s_regmap_config);
102 if (IS_ERR(i2s->regmap)) {
103 dev_err(&pdev->dev, "regmap_init_mmio failed\n");
104 return PTR_ERR(i2s->regmap);
107 tx_data = &i2s->tx_dma_data;
108 rx_data = &i2s->rx_dma_data;
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;
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;
116 tx_data->irq = fwnode_irq_get_byname(fwnode, "tx");
117 if (tx_data->irq < 0) {
118 dev_err(&pdev->dev, "dma tx irq invalid\n");
122 rx_data->irq = fwnode_irq_get_byname(fwnode, "rx");
123 if (rx_data->irq < 0) {
124 dev_err(&pdev->dev, "dma rx irq invalid\n");
128 device_property_read_u32(&pdev->dev, "clock-frequency", &i2s->clk_rate);
129 if (!i2s->clk_rate) {
130 dev_err(&pdev->dev, "clock-frequency property invalid\n");
134 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
136 if (i2s->rev_id == 1) {
137 regmap_write(i2s->regmap, LS_I2S_CTRL, I2S_CTRL_RESET);
141 ret = devm_snd_soc_register_component(&pdev->dev,
142 &loongson_i2s_component,
143 &loongson_i2s_dai, 1);
145 dev_err(&pdev->dev, "register DAI failed %d\n", ret);
152 static const struct pci_device_id loongson_i2s_ids[] = {
153 { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a27) },
156 MODULE_DEVICE_TABLE(pci, loongson_i2s_ids);
158 static struct pci_driver loongson_i2s_driver = {
159 .name = "loongson-i2s-pci",
160 .id_table = loongson_i2s_ids,
161 .probe = loongson_i2s_pci_probe,
163 .owner = THIS_MODULE,
164 .pm = pm_sleep_ptr(&loongson_i2s_pm),
167 module_pci_driver(loongson_i2s_driver);
169 MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
170 MODULE_AUTHOR("Loongson Technology Corporation Limited");
171 MODULE_LICENSE("GPL");