sound/soc/loongson/loongson_i2s_pci.c

   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
  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
  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
  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
  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");