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
 22static DEFINE_IDA(alcor_pci_idr);
 23
 24static 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
 33static const struct alcor_dev_cfg alcor_cfg = {
 34	.dma = 0,
 35};
 36
 37static const struct alcor_dev_cfg au6621_cfg = {
 38	.dma = 1,
 39};
 40
 41static const struct alcor_dev_cfg au6625_cfg = {
 42	.dma = 0,
 43};
 44
 45static 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};
 54MODULE_DEVICE_TABLE(pci, pci_ids);
 55
 56void alcor_write8(struct alcor_pci_priv *priv, u8 val, unsigned int addr)
 57{
 58	writeb(val, priv->iobase + addr);
 59}
 60EXPORT_SYMBOL_GPL(alcor_write8);
 61
 62void alcor_write16(struct alcor_pci_priv *priv, u16 val, unsigned int addr)
 63{
 64	writew(val, priv->iobase + addr);
 65}
 66EXPORT_SYMBOL_GPL(alcor_write16);
 67
 68void alcor_write32(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
 69{
 70	writel(val, priv->iobase + addr);
 71}
 72EXPORT_SYMBOL_GPL(alcor_write32);
 73
 74void alcor_write32be(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
 75{
 76	iowrite32be(val, priv->iobase + addr);
 77}
 78EXPORT_SYMBOL_GPL(alcor_write32be);
 79
 80u8 alcor_read8(struct alcor_pci_priv *priv, unsigned int addr)
 81{
 82	return readb(priv->iobase + addr);
 83}
 84EXPORT_SYMBOL_GPL(alcor_read8);
 85
 86u32 alcor_read32(struct alcor_pci_priv *priv, unsigned int addr)
 87{
 88	return readl(priv->iobase + addr);
 89}
 90EXPORT_SYMBOL_GPL(alcor_read32);
 91
 92u32 alcor_read32be(struct alcor_pci_priv *priv, unsigned int addr)
 93{
 94	return ioread32be(priv->iobase + addr);
 95}
 96EXPORT_SYMBOL_GPL(alcor_read32be);
 97
 98static 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
171error_clear_drvdata:
172	pci_clear_master(pdev);
173	pci_set_drvdata(pdev, NULL);
174error_release_regions:
175	pci_release_regions(pdev);
176error_free_ida:
177	ida_free(&alcor_pci_idr, priv->id);
178	return ret;
179}
180
181static 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
197static int alcor_suspend(struct device *dev)
198{
199	return 0;
200}
201
202static 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
213static SIMPLE_DEV_PM_OPS(alcor_pci_pm_ops, alcor_suspend, alcor_resume);
214
215static 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
225module_pci_driver(alcor_driver);
226
227MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
228MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface");
229MODULE_LICENSE("GPL");