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