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, 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, 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, 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(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(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(&pdev->dev, sizeof(*priv), GFP_KERNEL);
110	if (!priv)
111		return -ENOMEM;
112
113	ret = ida_alloc(&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 = pci_request_regions(pdev, DRV_NAME_ALCOR_PCI);
125	if (ret) {
126		dev_err(&pdev->dev, "Cannot request region\n");
127		ret = -ENOMEM;
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_release_regions;
135	}
136
137	priv->iobase = pcim_iomap(pdev, bar, 0);
138	if (!priv->iobase) {
139		ret = -ENOMEM;
140		goto error_release_regions;
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(priv->dev, AU6601_SDMA_MASK);
148	if (ret) {
149		dev_err(priv->dev, "Failed to set DMA mask\n");
150		goto error_release_regions;
151	}
152
153	pci_set_master(pdev);
154	pci_set_drvdata(pdev, 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(&pdev->dev, priv->id, alcor_pci_cells,
161			ARRAY_SIZE(alcor_pci_cells), NULL, 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(pdev);
171	pci_set_drvdata(pdev, NULL);
172error_release_regions:
173	pci_release_regions(pdev);
174error_free_ida:
175	ida_free(&alcor_pci_idr, priv->id);
176	return ret;
177}
178
179static void alcor_pci_remove(struct pci_dev *pdev)
180{
181	struct alcor_pci_priv *priv;
182
183	priv = pci_get_drvdata(pdev);
184
185	mfd_remove_devices(&pdev->dev);
186
187	ida_free(&alcor_pci_idr, priv->id);
188
189	pci_release_regions(pdev);
190	pci_clear_master(pdev);
191	pci_set_drvdata(pdev, NULL);
192}
193
194#ifdef CONFIG_PM_SLEEP
195static int alcor_suspend(struct device *dev)
196{
197	return 0;
198}
199
200static int alcor_resume(struct device *dev)
201{
202	struct alcor_pci_priv *priv = dev_get_drvdata(dev);
203
204	pci_disable_link_state(priv->pdev,
205			       PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
206
207	return 0;
208}
209#endif /* CONFIG_PM_SLEEP */
210
211static SIMPLE_DEV_PM_OPS(alcor_pci_pm_ops, alcor_suspend, alcor_resume);
212
213static struct pci_driver alcor_driver = {
214	.name	=	DRV_NAME_ALCOR_PCI,
215	.id_table =	pci_ids,
216	.probe	=	alcor_pci_probe,
217	.remove =	alcor_pci_remove,
218	.driver	=	{
219		.pm	= &alcor_pci_pm_ops
220	},
221};
222
223module_pci_driver(alcor_driver);
224
225MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
226MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface");
227MODULE_LICENSE("GPL");