1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2018 Oleksij Rempel <linux@rempel-privat.de>
4 *
5 * Driver for Alcor Micro AU6601 and AU6621 controllers
6 */
7
8 #include <linux/delay.h>
9 #include <linux/interrupt.h>
10 #include <linux/io.h>
11 #include <linux/irq.h>
12 #include <linux/mfd/core.h>
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm.h>
17
18 #include <linux/alcor_pci.h>
19
20 #define DRV_NAME_ALCOR_PCI "alcor_pci"
21
22 static DEFINE_IDA(alcor_pci_idr);
23
24 static struct mfd_cell alcor_pci_cells[] = {
25 [ALCOR_SD_CARD] = {
26 .name = DRV_NAME_ALCOR_PCI_SDMMC,
27 },
28 [ALCOR_MS_CARD] = {
29 .name = DRV_NAME_ALCOR_PCI_MS,
30 },
31 };
32
33 static const struct alcor_dev_cfg alcor_cfg = {
34 .dma = 0,
35 };
36
37 static const struct alcor_dev_cfg au6621_cfg = {
38 .dma = 1,
39 };
40
41 static const struct alcor_dev_cfg au6625_cfg = {
42 .dma = 0,
43 };
44
45 static const struct pci_device_id pci_ids[] = {
46 { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6601),
47 .driver_data = (kernel_ulong_t)&alcor_cfg },
48 { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6621),
49 .driver_data = (kernel_ulong_t)&au6621_cfg },
50 { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6625),
51 .driver_data = (kernel_ulong_t)&au6625_cfg },
52 {},
53 };
54 MODULE_DEVICE_TABLE(pci, pci_ids);
55
alcor_write8(struct alcor_pci_priv * priv,u8 val,unsigned int addr)56 void alcor_write8(struct alcor_pci_priv *priv, u8 val, unsigned int addr)
57 {
58 writeb(val, priv->iobase + addr);
59 }
60 EXPORT_SYMBOL_GPL(alcor_write8);
61
alcor_write16(struct alcor_pci_priv * priv,u16 val,unsigned int addr)62 void alcor_write16(struct alcor_pci_priv *priv, u16 val, unsigned int addr)
63 {
64 writew(val, priv->iobase + addr);
65 }
66 EXPORT_SYMBOL_GPL(alcor_write16);
67
alcor_write32(struct alcor_pci_priv * priv,u32 val,unsigned int addr)68 void alcor_write32(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
69 {
70 writel(val, priv->iobase + addr);
71 }
72 EXPORT_SYMBOL_GPL(alcor_write32);
73
alcor_write32be(struct alcor_pci_priv * priv,u32 val,unsigned int addr)74 void alcor_write32be(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
75 {
76 iowrite32be(val, priv->iobase + addr);
77 }
78 EXPORT_SYMBOL_GPL(alcor_write32be);
79
alcor_read8(struct alcor_pci_priv * priv,unsigned int addr)80 u8 alcor_read8(struct alcor_pci_priv *priv, unsigned int addr)
81 {
82 return readb(priv->iobase + addr);
83 }
84 EXPORT_SYMBOL_GPL(alcor_read8);
85
alcor_read32(struct alcor_pci_priv * priv,unsigned int addr)86 u32 alcor_read32(struct alcor_pci_priv *priv, unsigned int addr)
87 {
88 return readl(priv->iobase + addr);
89 }
90 EXPORT_SYMBOL_GPL(alcor_read32);
91
alcor_read32be(struct alcor_pci_priv * priv,unsigned int addr)92 u32 alcor_read32be(struct alcor_pci_priv *priv, unsigned int addr)
93 {
94 return ioread32be(priv->iobase + addr);
95 }
96 EXPORT_SYMBOL_GPL(alcor_read32be);
97
alcor_pci_probe(struct pci_dev * pdev,const struct pci_device_id * ent)98 static int alcor_pci_probe(struct pci_dev *pdev,
99 const struct pci_device_id *ent)
100 {
101 struct alcor_dev_cfg *cfg;
102 struct alcor_pci_priv *priv;
103 int ret, i, bar = 0;
104
105 cfg = (void *)ent->driver_data;
106
107 ret = pcim_enable_device(pdev);
108 if (ret)
109 return ret;
110
111 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
112 if (!priv)
113 return -ENOMEM;
114
115 ret = ida_alloc(&alcor_pci_idr, GFP_KERNEL);
116 if (ret < 0)
117 return ret;
118 priv->id = ret;
119
120 priv->pdev = pdev;
121 priv->parent_pdev = pdev->bus->self;
122 priv->dev = &pdev->dev;
123 priv->cfg = cfg;
124 priv->irq = pdev->irq;
125
126 ret = pci_request_regions(pdev, DRV_NAME_ALCOR_PCI);
127 if (ret) {
128 dev_err(&pdev->dev, "Cannot request region\n");
129 ret = -ENOMEM;
130 goto error_free_ida;
131 }
132
133 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
134 dev_err(&pdev->dev, "BAR %d is not iomem. Aborting.\n", bar);
135 ret = -ENODEV;
136 goto error_release_regions;
137 }
138
139 priv->iobase = pcim_iomap(pdev, bar, 0);
140 if (!priv->iobase) {
141 ret = -ENOMEM;
142 goto error_release_regions;
143 }
144
145 /* make sure irqs are disabled */
146 alcor_write32(priv, 0, AU6601_REG_INT_ENABLE);
147 alcor_write32(priv, 0, AU6601_MS_INT_ENABLE);
148
149 ret = dma_set_mask_and_coherent(priv->dev, AU6601_SDMA_MASK);
150 if (ret) {
151 dev_err(priv->dev, "Failed to set DMA mask\n");
152 goto error_release_regions;
153 }
154
155 pci_set_master(pdev);
156 pci_set_drvdata(pdev, priv);
157
158 for (i = 0; i < ARRAY_SIZE(alcor_pci_cells); i++) {
159 alcor_pci_cells[i].platform_data = priv;
160 alcor_pci_cells[i].pdata_size = sizeof(*priv);
161 }
162 ret = mfd_add_devices(&pdev->dev, priv->id, alcor_pci_cells,
163 ARRAY_SIZE(alcor_pci_cells), NULL, 0, NULL);
164 if (ret < 0)
165 goto error_clear_drvdata;
166
167 pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
168
169 return 0;
170
171 error_clear_drvdata:
172 pci_clear_master(pdev);
173 pci_set_drvdata(pdev, NULL);
174 error_release_regions:
175 pci_release_regions(pdev);
176 error_free_ida:
177 ida_free(&alcor_pci_idr, priv->id);
178 return ret;
179 }
180
alcor_pci_remove(struct pci_dev * pdev)181 static void alcor_pci_remove(struct pci_dev *pdev)
182 {
183 struct alcor_pci_priv *priv;
184
185 priv = pci_get_drvdata(pdev);
186
187 mfd_remove_devices(&pdev->dev);
188
189 ida_free(&alcor_pci_idr, priv->id);
190
191 pci_release_regions(pdev);
192 pci_clear_master(pdev);
193 pci_set_drvdata(pdev, NULL);
194 }
195
196 #ifdef CONFIG_PM_SLEEP
alcor_suspend(struct device * dev)197 static int alcor_suspend(struct device *dev)
198 {
199 return 0;
200 }
201
alcor_resume(struct device * dev)202 static int alcor_resume(struct device *dev)
203 {
204 struct alcor_pci_priv *priv = dev_get_drvdata(dev);
205
206 pci_disable_link_state(priv->pdev,
207 PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
208
209 return 0;
210 }
211 #endif /* CONFIG_PM_SLEEP */
212
213 static SIMPLE_DEV_PM_OPS(alcor_pci_pm_ops, alcor_suspend, alcor_resume);
214
215 static struct pci_driver alcor_driver = {
216 .name = DRV_NAME_ALCOR_PCI,
217 .id_table = pci_ids,
218 .probe = alcor_pci_probe,
219 .remove = alcor_pci_remove,
220 .driver = {
221 .pm = &alcor_pci_pm_ops
222 },
223 };
224
225 module_pci_driver(alcor_driver);
226
227 MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
228 MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface");
229 MODULE_LICENSE("GPL");
230