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14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/io.h>
17#include <linux/irq.h>
18#include <linux/interrupt.h>
19#include <linux/kernel.h>
20#include <linux/pci.h>
21#include <linux/platform_device.h>
22#include <linux/of_irq.h>
23#include <linux/gpio/driver.h>
24
25#define DRV_NAME "sdv_gpio"
26#define SDV_NUM_PUB_GPIOS 12
27#define PCI_DEVICE_ID_SDV_GPIO 0x2e67
28#define GPIO_BAR 0
29
30#define GPOUTR 0x00
31#define GPOER 0x04
32#define GPINR 0x08
33
34#define GPSTR 0x0c
35#define GPIT1R0 0x10
36#define GPIO_INT 0x14
37#define GPIT1R1 0x18
38
39#define GPMUXCTL 0x1c
40
41struct sdv_gpio_chip_data {
42 int irq_base;
43 void __iomem *gpio_pub_base;
44 struct irq_domain *id;
45 struct irq_chip_generic *gc;
46 struct gpio_chip chip;
47};
48
49static int sdv_gpio_pub_set_type(struct irq_data *d, unsigned int type)
50{
51 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
52 struct sdv_gpio_chip_data *sd = gc->private;
53 void __iomem *type_reg;
54 u32 reg;
55
56 if (d->hwirq < 8)
57 type_reg = sd->gpio_pub_base + GPIT1R0;
58 else
59 type_reg = sd->gpio_pub_base + GPIT1R1;
60
61 reg = readl(type_reg);
62
63 switch (type) {
64 case IRQ_TYPE_LEVEL_HIGH:
65 reg &= ~BIT(4 * (d->hwirq % 8));
66 break;
67
68 case IRQ_TYPE_LEVEL_LOW:
69 reg |= BIT(4 * (d->hwirq % 8));
70 break;
71
72 default:
73 return -EINVAL;
74 }
75
76 writel(reg, type_reg);
77 return 0;
78}
79
80static irqreturn_t sdv_gpio_pub_irq_handler(int irq, void *data)
81{
82 struct sdv_gpio_chip_data *sd = data;
83 u32 irq_stat = readl(sd->gpio_pub_base + GPSTR);
84
85 irq_stat &= readl(sd->gpio_pub_base + GPIO_INT);
86 if (!irq_stat)
87 return IRQ_NONE;
88
89 while (irq_stat) {
90 u32 irq_bit = __fls(irq_stat);
91
92 irq_stat &= ~BIT(irq_bit);
93 generic_handle_irq(irq_find_mapping(sd->id, irq_bit));
94 }
95
96 return IRQ_HANDLED;
97}
98
99static int sdv_xlate(struct irq_domain *h, struct device_node *node,
100 const u32 *intspec, u32 intsize, irq_hw_number_t *out_hwirq,
101 u32 *out_type)
102{
103 u32 line, type;
104
105 if (node != irq_domain_get_of_node(h))
106 return -EINVAL;
107
108 if (intsize < 2)
109 return -EINVAL;
110
111 line = *intspec;
112 *out_hwirq = line;
113
114 intspec++;
115 type = *intspec;
116
117 switch (type) {
118 case IRQ_TYPE_LEVEL_LOW:
119 case IRQ_TYPE_LEVEL_HIGH:
120 *out_type = type;
121 break;
122 default:
123 return -EINVAL;
124 }
125 return 0;
126}
127
128static const struct irq_domain_ops irq_domain_sdv_ops = {
129 .xlate = sdv_xlate,
130};
131
132static int sdv_register_irqsupport(struct sdv_gpio_chip_data *sd,
133 struct pci_dev *pdev)
134{
135 struct irq_chip_type *ct;
136 int ret;
137
138 sd->irq_base = irq_alloc_descs(-1, 0, SDV_NUM_PUB_GPIOS, -1);
139 if (sd->irq_base < 0)
140 return sd->irq_base;
141
142
143 writel(0, sd->gpio_pub_base + GPIO_INT);
144 writel((1 << 11) - 1, sd->gpio_pub_base + GPSTR);
145
146 ret = request_irq(pdev->irq, sdv_gpio_pub_irq_handler, IRQF_SHARED,
147 "sdv_gpio", sd);
148 if (ret)
149 goto out_free_desc;
150
151
152
153
154
155
156 sd->gc = irq_alloc_generic_chip("sdv-gpio", 1, sd->irq_base,
157 sd->gpio_pub_base, handle_fasteoi_irq);
158 if (!sd->gc) {
159 ret = -ENOMEM;
160 goto out_free_irq;
161 }
162
163 sd->gc->private = sd;
164 ct = sd->gc->chip_types;
165 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
166 ct->regs.eoi = GPSTR;
167 ct->regs.mask = GPIO_INT;
168 ct->chip.irq_mask = irq_gc_mask_clr_bit;
169 ct->chip.irq_unmask = irq_gc_mask_set_bit;
170 ct->chip.irq_eoi = irq_gc_eoi;
171 ct->chip.irq_set_type = sdv_gpio_pub_set_type;
172
173 irq_setup_generic_chip(sd->gc, IRQ_MSK(SDV_NUM_PUB_GPIOS),
174 IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST,
175 IRQ_LEVEL | IRQ_NOPROBE);
176
177 sd->id = irq_domain_add_legacy(pdev->dev.of_node, SDV_NUM_PUB_GPIOS,
178 sd->irq_base, 0, &irq_domain_sdv_ops, sd);
179 if (!sd->id) {
180 ret = -ENODEV;
181 goto out_free_irq;
182 }
183 return 0;
184out_free_irq:
185 free_irq(pdev->irq, sd);
186out_free_desc:
187 irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
188 return ret;
189}
190
191static int sdv_gpio_probe(struct pci_dev *pdev,
192 const struct pci_device_id *pci_id)
193{
194 struct sdv_gpio_chip_data *sd;
195 unsigned long addr;
196 const void *prop;
197 int len;
198 int ret;
199 u32 mux_val;
200
201 sd = kzalloc(sizeof(struct sdv_gpio_chip_data), GFP_KERNEL);
202 if (!sd)
203 return -ENOMEM;
204 ret = pci_enable_device(pdev);
205 if (ret) {
206 dev_err(&pdev->dev, "can't enable device.\n");
207 goto done;
208 }
209
210 ret = pci_request_region(pdev, GPIO_BAR, DRV_NAME);
211 if (ret) {
212 dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);
213 goto disable_pci;
214 }
215
216 addr = pci_resource_start(pdev, GPIO_BAR);
217 if (!addr) {
218 ret = -ENODEV;
219 goto release_reg;
220 }
221 sd->gpio_pub_base = ioremap(addr, pci_resource_len(pdev, GPIO_BAR));
222
223 prop = of_get_property(pdev->dev.of_node, "intel,muxctl", &len);
224 if (prop && len == 4) {
225 mux_val = of_read_number(prop, 1);
226 writel(mux_val, sd->gpio_pub_base + GPMUXCTL);
227 }
228
229 ret = bgpio_init(&sd->chip, &pdev->dev, 4,
230 sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,
231 NULL, sd->gpio_pub_base + GPOER, NULL, 0);
232 if (ret)
233 goto unmap;
234 sd->chip.ngpio = SDV_NUM_PUB_GPIOS;
235
236 ret = gpiochip_add_data(&sd->chip, sd);
237 if (ret < 0) {
238 dev_err(&pdev->dev, "gpiochip_add() failed.\n");
239 goto unmap;
240 }
241
242 ret = sdv_register_irqsupport(sd, pdev);
243 if (ret)
244 goto unmap;
245
246 pci_set_drvdata(pdev, sd);
247 dev_info(&pdev->dev, "Sodaville GPIO driver registered.\n");
248 return 0;
249
250unmap:
251 iounmap(sd->gpio_pub_base);
252release_reg:
253 pci_release_region(pdev, GPIO_BAR);
254disable_pci:
255 pci_disable_device(pdev);
256done:
257 kfree(sd);
258 return ret;
259}
260
261static const struct pci_device_id sdv_gpio_pci_ids[] = {
262 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_SDV_GPIO) },
263 { 0, },
264};
265
266static struct pci_driver sdv_gpio_driver = {
267 .driver = {
268 .suppress_bind_attrs = true,
269 },
270 .name = DRV_NAME,
271 .id_table = sdv_gpio_pci_ids,
272 .probe = sdv_gpio_probe,
273};
274builtin_pci_driver(sdv_gpio_driver);
275
