1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
4 */
5 #include <linux/gpio/driver.h>
6 #include <linux/interrupt.h>
7 #include <linux/irq.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/slab.h>
12
13 #define PCH_EDGE_FALLING 0
14 #define PCH_EDGE_RISING BIT(0)
15 #define PCH_LEVEL_L BIT(1)
16 #define PCH_LEVEL_H (BIT(0) | BIT(1))
17 #define PCH_EDGE_BOTH BIT(2)
18 #define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
19
20 #define PCH_IRQ_BASE 24
21
22 struct pch_regs {
23 u32 ien;
24 u32 istatus;
25 u32 idisp;
26 u32 iclr;
27 u32 imask;
28 u32 imaskclr;
29 u32 po;
30 u32 pi;
31 u32 pm;
32 u32 im0;
33 u32 im1;
34 u32 reserved[3];
35 u32 gpio_use_sel;
36 u32 reset;
37 };
38
39 enum pch_type_t {
40 INTEL_EG20T_PCH,
41 OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
42 OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
43 };
44
45 /* Specifies number of GPIO PINS */
46 static int gpio_pins[] = {
47 [INTEL_EG20T_PCH] = 12,
48 [OKISEMI_ML7223m_IOH] = 8,
49 [OKISEMI_ML7223n_IOH] = 8,
50 };
51
52 /**
53 * struct pch_gpio_reg_data - The register store data.
54 * @ien_reg: To store contents of IEN register.
55 * @imask_reg: To store contents of IMASK register.
56 * @po_reg: To store contents of PO register.
57 * @pm_reg: To store contents of PM register.
58 * @im0_reg: To store contents of IM0 register.
59 * @im1_reg: To store contents of IM1 register.
60 * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register.
61 * (Only ML7223 Bus-n)
62 */
63 struct pch_gpio_reg_data {
64 u32 ien_reg;
65 u32 imask_reg;
66 u32 po_reg;
67 u32 pm_reg;
68 u32 im0_reg;
69 u32 im1_reg;
70 u32 gpio_use_sel_reg;
71 };
72
73 /**
74 * struct pch_gpio - GPIO private data structure.
75 * @base: PCI base address of Memory mapped I/O register.
76 * @reg: Memory mapped PCH GPIO register list.
77 * @dev: Pointer to device structure.
78 * @gpio: Data for GPIO infrastructure.
79 * @pch_gpio_reg: Memory mapped Register data is saved here
80 * when suspend.
81 * @lock: Used for register access protection
82 * @irq_base: Save base of IRQ number for interrupt
83 * @ioh: IOH ID
84 * @spinlock: Used for register access protection
85 */
86 struct pch_gpio {
87 void __iomem *base;
88 struct pch_regs __iomem *reg;
89 struct device *dev;
90 struct gpio_chip gpio;
91 struct pch_gpio_reg_data pch_gpio_reg;
92 int irq_base;
93 enum pch_type_t ioh;
94 spinlock_t spinlock;
95 };
96
pch_gpio_set(struct gpio_chip * gpio,unsigned nr,int val)97 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
98 {
99 u32 reg_val;
100 struct pch_gpio *chip = gpiochip_get_data(gpio);
101 unsigned long flags;
102
103 spin_lock_irqsave(&chip->spinlock, flags);
104 reg_val = ioread32(&chip->reg->po);
105 if (val)
106 reg_val |= (1 << nr);
107 else
108 reg_val &= ~(1 << nr);
109
110 iowrite32(reg_val, &chip->reg->po);
111 spin_unlock_irqrestore(&chip->spinlock, flags);
112 }
113
pch_gpio_get(struct gpio_chip * gpio,unsigned nr)114 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
115 {
116 struct pch_gpio *chip = gpiochip_get_data(gpio);
117
118 return (ioread32(&chip->reg->pi) >> nr) & 1;
119 }
120
pch_gpio_direction_output(struct gpio_chip * gpio,unsigned nr,int val)121 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
122 int val)
123 {
124 struct pch_gpio *chip = gpiochip_get_data(gpio);
125 u32 pm;
126 u32 reg_val;
127 unsigned long flags;
128
129 spin_lock_irqsave(&chip->spinlock, flags);
130
131 reg_val = ioread32(&chip->reg->po);
132 if (val)
133 reg_val |= (1 << nr);
134 else
135 reg_val &= ~(1 << nr);
136 iowrite32(reg_val, &chip->reg->po);
137
138 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
139 pm |= (1 << nr);
140 iowrite32(pm, &chip->reg->pm);
141
142 spin_unlock_irqrestore(&chip->spinlock, flags);
143
144 return 0;
145 }
146
pch_gpio_direction_input(struct gpio_chip * gpio,unsigned nr)147 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
148 {
149 struct pch_gpio *chip = gpiochip_get_data(gpio);
150 u32 pm;
151 unsigned long flags;
152
153 spin_lock_irqsave(&chip->spinlock, flags);
154 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
155 pm &= ~(1 << nr);
156 iowrite32(pm, &chip->reg->pm);
157 spin_unlock_irqrestore(&chip->spinlock, flags);
158
159 return 0;
160 }
161
162 /*
163 * Save register configuration and disable interrupts.
164 */
pch_gpio_save_reg_conf(struct pch_gpio * chip)165 static void __maybe_unused pch_gpio_save_reg_conf(struct pch_gpio *chip)
166 {
167 chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
168 chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
169 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
170 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
171 chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
172 if (chip->ioh == INTEL_EG20T_PCH)
173 chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1);
174 if (chip->ioh == OKISEMI_ML7223n_IOH)
175 chip->pch_gpio_reg.gpio_use_sel_reg = ioread32(&chip->reg->gpio_use_sel);
176 }
177
178 /*
179 * This function restores the register configuration of the GPIO device.
180 */
pch_gpio_restore_reg_conf(struct pch_gpio * chip)181 static void __maybe_unused pch_gpio_restore_reg_conf(struct pch_gpio *chip)
182 {
183 iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
184 iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
185 /* to store contents of PO register */
186 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
187 /* to store contents of PM register */
188 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
189 iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0);
190 if (chip->ioh == INTEL_EG20T_PCH)
191 iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1);
192 if (chip->ioh == OKISEMI_ML7223n_IOH)
193 iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, &chip->reg->gpio_use_sel);
194 }
195
pch_gpio_to_irq(struct gpio_chip * gpio,unsigned offset)196 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
197 {
198 struct pch_gpio *chip = gpiochip_get_data(gpio);
199 return chip->irq_base + offset;
200 }
201
pch_gpio_setup(struct pch_gpio * chip)202 static void pch_gpio_setup(struct pch_gpio *chip)
203 {
204 struct gpio_chip *gpio = &chip->gpio;
205
206 gpio->label = dev_name(chip->dev);
207 gpio->parent = chip->dev;
208 gpio->owner = THIS_MODULE;
209 gpio->direction_input = pch_gpio_direction_input;
210 gpio->get = pch_gpio_get;
211 gpio->direction_output = pch_gpio_direction_output;
212 gpio->set = pch_gpio_set;
213 gpio->base = -1;
214 gpio->ngpio = gpio_pins[chip->ioh];
215 gpio->can_sleep = false;
216 gpio->to_irq = pch_gpio_to_irq;
217 }
218
pch_irq_type(struct irq_data * d,unsigned int type)219 static int pch_irq_type(struct irq_data *d, unsigned int type)
220 {
221 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
222 struct pch_gpio *chip = gc->private;
223 u32 im, im_pos, val;
224 u32 __iomem *im_reg;
225 unsigned long flags;
226 int ch, irq = d->irq;
227
228 ch = irq - chip->irq_base;
229 if (irq <= chip->irq_base + 7) {
230 im_reg = &chip->reg->im0;
231 im_pos = ch;
232 } else {
233 im_reg = &chip->reg->im1;
234 im_pos = ch - 8;
235 }
236 dev_dbg(chip->dev, "irq=%d type=%d ch=%d pos=%d\n", irq, type, ch, im_pos);
237
238 spin_lock_irqsave(&chip->spinlock, flags);
239
240 switch (type) {
241 case IRQ_TYPE_EDGE_RISING:
242 val = PCH_EDGE_RISING;
243 break;
244 case IRQ_TYPE_EDGE_FALLING:
245 val = PCH_EDGE_FALLING;
246 break;
247 case IRQ_TYPE_EDGE_BOTH:
248 val = PCH_EDGE_BOTH;
249 break;
250 case IRQ_TYPE_LEVEL_HIGH:
251 val = PCH_LEVEL_H;
252 break;
253 case IRQ_TYPE_LEVEL_LOW:
254 val = PCH_LEVEL_L;
255 break;
256 default:
257 goto unlock;
258 }
259
260 /* Set interrupt mode */
261 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
262 iowrite32(im | (val << (im_pos * 4)), im_reg);
263
264 /* And the handler */
265 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
266 irq_set_handler_locked(d, handle_level_irq);
267 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
268 irq_set_handler_locked(d, handle_edge_irq);
269
270 unlock:
271 spin_unlock_irqrestore(&chip->spinlock, flags);
272 return 0;
273 }
274
pch_irq_unmask(struct irq_data * d)275 static void pch_irq_unmask(struct irq_data *d)
276 {
277 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
278 struct pch_gpio *chip = gc->private;
279
280 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr);
281 }
282
pch_irq_mask(struct irq_data * d)283 static void pch_irq_mask(struct irq_data *d)
284 {
285 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
286 struct pch_gpio *chip = gc->private;
287
288 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask);
289 }
290
pch_irq_ack(struct irq_data * d)291 static void pch_irq_ack(struct irq_data *d)
292 {
293 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
294 struct pch_gpio *chip = gc->private;
295
296 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->iclr);
297 }
298
pch_gpio_handler(int irq,void * dev_id)299 static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
300 {
301 struct pch_gpio *chip = dev_id;
302 unsigned long reg_val = ioread32(&chip->reg->istatus);
303 int i, ret = IRQ_NONE;
304
305 for_each_set_bit(i, ®_val, gpio_pins[chip->ioh]) {
306 dev_dbg(chip->dev, "[%d]:irq=%d status=0x%lx\n", i, irq, reg_val);
307 generic_handle_irq(chip->irq_base + i);
308 ret = IRQ_HANDLED;
309 }
310 return ret;
311 }
312
pch_gpio_alloc_generic_chip(struct pch_gpio * chip,unsigned int irq_start,unsigned int num)313 static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
314 unsigned int irq_start,
315 unsigned int num)
316 {
317 struct irq_chip_generic *gc;
318 struct irq_chip_type *ct;
319 int rv;
320
321 gc = devm_irq_alloc_generic_chip(chip->dev, "pch_gpio", 1, irq_start,
322 chip->base, handle_simple_irq);
323 if (!gc)
324 return -ENOMEM;
325
326 gc->private = chip;
327 ct = gc->chip_types;
328
329 ct->chip.irq_ack = pch_irq_ack;
330 ct->chip.irq_mask = pch_irq_mask;
331 ct->chip.irq_unmask = pch_irq_unmask;
332 ct->chip.irq_set_type = pch_irq_type;
333
334 rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
335 IRQ_GC_INIT_MASK_CACHE,
336 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
337
338 return rv;
339 }
340
pch_gpio_probe(struct pci_dev * pdev,const struct pci_device_id * id)341 static int pch_gpio_probe(struct pci_dev *pdev,
342 const struct pci_device_id *id)
343 {
344 s32 ret;
345 struct pch_gpio *chip;
346 int irq_base;
347 u32 msk;
348
349 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
350 if (chip == NULL)
351 return -ENOMEM;
352
353 chip->dev = &pdev->dev;
354 ret = pcim_enable_device(pdev);
355 if (ret) {
356 dev_err(&pdev->dev, "pci_enable_device FAILED");
357 return ret;
358 }
359
360 ret = pcim_iomap_regions(pdev, 1 << 1, KBUILD_MODNAME);
361 if (ret) {
362 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
363 return ret;
364 }
365
366 chip->base = pcim_iomap_table(pdev)[1];
367
368 if (pdev->device == 0x8803)
369 chip->ioh = INTEL_EG20T_PCH;
370 else if (pdev->device == 0x8014)
371 chip->ioh = OKISEMI_ML7223m_IOH;
372 else if (pdev->device == 0x8043)
373 chip->ioh = OKISEMI_ML7223n_IOH;
374
375 chip->reg = chip->base;
376 pci_set_drvdata(pdev, chip);
377 spin_lock_init(&chip->spinlock);
378 pch_gpio_setup(chip);
379
380 ret = devm_gpiochip_add_data(&pdev->dev, &chip->gpio, chip);
381 if (ret) {
382 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
383 return ret;
384 }
385
386 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,
387 gpio_pins[chip->ioh], NUMA_NO_NODE);
388 if (irq_base < 0) {
389 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
390 chip->irq_base = -1;
391 return 0;
392 }
393 chip->irq_base = irq_base;
394
395 /* Mask all interrupts, but enable them */
396 msk = (1 << gpio_pins[chip->ioh]) - 1;
397 iowrite32(msk, &chip->reg->imask);
398 iowrite32(msk, &chip->reg->ien);
399
400 ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
401 IRQF_SHARED, KBUILD_MODNAME, chip);
402 if (ret) {
403 dev_err(&pdev->dev, "request_irq failed\n");
404 return ret;
405 }
406
407 return pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
408 }
409
pch_gpio_suspend(struct device * dev)410 static int __maybe_unused pch_gpio_suspend(struct device *dev)
411 {
412 struct pch_gpio *chip = dev_get_drvdata(dev);
413 unsigned long flags;
414
415 spin_lock_irqsave(&chip->spinlock, flags);
416 pch_gpio_save_reg_conf(chip);
417 spin_unlock_irqrestore(&chip->spinlock, flags);
418
419 return 0;
420 }
421
pch_gpio_resume(struct device * dev)422 static int __maybe_unused pch_gpio_resume(struct device *dev)
423 {
424 struct pch_gpio *chip = dev_get_drvdata(dev);
425 unsigned long flags;
426
427 spin_lock_irqsave(&chip->spinlock, flags);
428 iowrite32(0x01, &chip->reg->reset);
429 iowrite32(0x00, &chip->reg->reset);
430 pch_gpio_restore_reg_conf(chip);
431 spin_unlock_irqrestore(&chip->spinlock, flags);
432
433 return 0;
434 }
435
436 static SIMPLE_DEV_PM_OPS(pch_gpio_pm_ops, pch_gpio_suspend, pch_gpio_resume);
437
438 static const struct pci_device_id pch_gpio_pcidev_id[] = {
439 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
440 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
441 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) },
442 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) },
443 { 0, }
444 };
445 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
446
447 static struct pci_driver pch_gpio_driver = {
448 .name = "pch_gpio",
449 .id_table = pch_gpio_pcidev_id,
450 .probe = pch_gpio_probe,
451 .driver = {
452 .pm = &pch_gpio_pm_ops,
453 },
454 };
455
456 module_pci_driver(pch_gpio_driver);
457
458 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
459 MODULE_LICENSE("GPL v2");
460
