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

source code of linux/drivers/misc/cardreader/alcor_pci.c