1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // loongson_i2s_pci.c -- Loongson I2S controller driver
4 //
5 // Copyright (C) 2023 Loongson Technology Corporation Limited
6 // 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
loongson_i2s_wr_reg(struct device * dev,unsigned int reg)19 static 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
loongson_i2s_rd_reg(struct device * dev,unsigned int reg)33 static 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
loongson_i2s_volatile_reg(struct device * dev,unsigned int reg)48 static 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
62 static 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
loongson_i2s_pci_probe(struct pci_dev * pdev,const struct pci_device_id * pid)73 static 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
143 static const struct pci_device_id loongson_i2s_ids[] = {
144 { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a27) },
145 { },
146 };
147 MODULE_DEVICE_TABLE(pci, loongson_i2s_ids);
148
149 static 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 };
157 module_pci_driver(loongson_i2s_driver);
158
159 MODULE_DESCRIPTION("Loongson I2S Master Mode ASoC Driver");
160 MODULE_AUTHOR("Loongson Technology Corporation Limited");
161 MODULE_LICENSE("GPL");
162