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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIO driver for the ACCES PCIe-IDIO-24 family
4 * Copyright (C) 2018 William Breathitt Gray
5 *
6 * This driver supports the following ACCES devices: PCIe-IDIO-24,
7 * PCIe-IDI-24, PCIe-IDO-24, and PCIe-IDIO-12.
8 */
9#include <linux/bits.h>
10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/gpio/regmap.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/pci.h>
17#include <linux/regmap.h>
18#include <linux/spinlock.h>
19#include <linux/types.h>
20
21/*
22 * PLX PEX8311 PCI LCS_INTCSR Interrupt Control/Status
23 *
24 * Bit: Description
25 * 0: Enable Interrupt Sources (Bit 0)
26 * 1: Enable Interrupt Sources (Bit 1)
27 * 2: Generate Internal PCI Bus Internal SERR# Interrupt
28 * 3: Mailbox Interrupt Enable
29 * 4: Power Management Interrupt Enable
30 * 5: Power Management Interrupt
31 * 6: Slave Read Local Data Parity Check Error Enable
32 * 7: Slave Read Local Data Parity Check Error Status
33 * 8: Internal PCI Wire Interrupt Enable
34 * 9: PCI Express Doorbell Interrupt Enable
35 * 10: PCI Abort Interrupt Enable
36 * 11: Local Interrupt Input Enable
37 * 12: Retry Abort Enable
38 * 13: PCI Express Doorbell Interrupt Active
39 * 14: PCI Abort Interrupt Active
40 * 15: Local Interrupt Input Active
41 * 16: Local Interrupt Output Enable
42 * 17: Local Doorbell Interrupt Enable
43 * 18: DMA Channel 0 Interrupt Enable
44 * 19: DMA Channel 1 Interrupt Enable
45 * 20: Local Doorbell Interrupt Active
46 * 21: DMA Channel 0 Interrupt Active
47 * 22: DMA Channel 1 Interrupt Active
48 * 23: Built-In Self-Test (BIST) Interrupt Active
49 * 24: Direct Master was the Bus Master during a Master or Target Abort
50 * 25: DMA Channel 0 was the Bus Master during a Master or Target Abort
51 * 26: DMA Channel 1 was the Bus Master during a Master or Target Abort
52 * 27: Target Abort after internal 256 consecutive Master Retrys
53 * 28: PCI Bus wrote data to LCS_MBOX0
54 * 29: PCI Bus wrote data to LCS_MBOX1
55 * 30: PCI Bus wrote data to LCS_MBOX2
56 * 31: PCI Bus wrote data to LCS_MBOX3
57 */
58#define PLX_PEX8311_PCI_LCS_INTCSR 0x68
59#define INTCSR_INTERNAL_PCI_WIRE BIT(8)
60#define INTCSR_LOCAL_INPUT BIT(11)
61#define IDIO_24_ENABLE_IRQ (INTCSR_INTERNAL_PCI_WIRE | INTCSR_LOCAL_INPUT)
62
63#define IDIO_24_OUT_BASE 0x0
64#define IDIO_24_TTLCMOS_OUT_REG 0x3
65#define IDIO_24_IN_BASE 0x4
66#define IDIO_24_TTLCMOS_IN_REG 0x7
67#define IDIO_24_COS_STATUS_BASE 0x8
68#define IDIO_24_CONTROL_REG 0xC
69#define IDIO_24_COS_ENABLE 0xE
70#define IDIO_24_SOFT_RESET 0xF
71
72#define CONTROL_REG_OUT_MODE BIT(1)
73
74#define COS_ENABLE_RISING BIT(1)
75#define COS_ENABLE_FALLING BIT(4)
76#define COS_ENABLE_BOTH (COS_ENABLE_RISING | COS_ENABLE_FALLING)
77
78static const struct regmap_config pex8311_intcsr_regmap_config = {
79 .name = "pex8311_intcsr",
80 .reg_bits = 32,
81 .reg_stride = 1,
82 .reg_base = PLX_PEX8311_PCI_LCS_INTCSR,
83 .val_bits = 32,
84 .io_port = true,
85};
86
87static const struct regmap_range idio_24_wr_ranges[] = {
88 regmap_reg_range(0x0, 0x3), regmap_reg_range(0x8, 0xC),
89 regmap_reg_range(0xE, 0xF),
90};
91static const struct regmap_range idio_24_rd_ranges[] = {
92 regmap_reg_range(0x0, 0xC), regmap_reg_range(0xE, 0xF),
93};
94static const struct regmap_range idio_24_volatile_ranges[] = {
95 regmap_reg_range(0x4, 0xB), regmap_reg_range(0xF, 0xF),
96};
97static const struct regmap_access_table idio_24_wr_table = {
98 .yes_ranges = idio_24_wr_ranges,
99 .n_yes_ranges = ARRAY_SIZE(idio_24_wr_ranges),
100};
101static const struct regmap_access_table idio_24_rd_table = {
102 .yes_ranges = idio_24_rd_ranges,
103 .n_yes_ranges = ARRAY_SIZE(idio_24_rd_ranges),
104};
105static const struct regmap_access_table idio_24_volatile_table = {
106 .yes_ranges = idio_24_volatile_ranges,
107 .n_yes_ranges = ARRAY_SIZE(idio_24_volatile_ranges),
108};
109
110static const struct regmap_config idio_24_regmap_config = {
111 .reg_bits = 8,
112 .reg_stride = 1,
113 .val_bits = 8,
114 .io_port = true,
115 .wr_table = &idio_24_wr_table,
116 .rd_table = &idio_24_rd_table,
117 .volatile_table = &idio_24_volatile_table,
118 .cache_type = REGCACHE_FLAT,
119 .use_raw_spinlock = true,
120};
121
122#define IDIO_24_NGPIO_PER_REG 8
123#define IDIO_24_REGMAP_IRQ(_id) \
124 [24 + _id] = { \
125 .reg_offset = (_id) / IDIO_24_NGPIO_PER_REG, \
126 .mask = BIT((_id) % IDIO_24_NGPIO_PER_REG), \
127 .type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \
128 }
129#define IDIO_24_IIN_IRQ(_id) IDIO_24_REGMAP_IRQ(_id)
130#define IDIO_24_TTL_IRQ(_id) IDIO_24_REGMAP_IRQ(24 + _id)
131
132static const struct regmap_irq idio_24_regmap_irqs[] = {
133 IDIO_24_IIN_IRQ(0), IDIO_24_IIN_IRQ(1), IDIO_24_IIN_IRQ(2), /* IIN 0-2 */
134 IDIO_24_IIN_IRQ(3), IDIO_24_IIN_IRQ(4), IDIO_24_IIN_IRQ(5), /* IIN 3-5 */
135 IDIO_24_IIN_IRQ(6), IDIO_24_IIN_IRQ(7), IDIO_24_IIN_IRQ(8), /* IIN 6-8 */
136 IDIO_24_IIN_IRQ(9), IDIO_24_IIN_IRQ(10), IDIO_24_IIN_IRQ(11), /* IIN 9-11 */
137 IDIO_24_IIN_IRQ(12), IDIO_24_IIN_IRQ(13), IDIO_24_IIN_IRQ(14), /* IIN 12-14 */
138 IDIO_24_IIN_IRQ(15), IDIO_24_IIN_IRQ(16), IDIO_24_IIN_IRQ(17), /* IIN 15-17 */
139 IDIO_24_IIN_IRQ(18), IDIO_24_IIN_IRQ(19), IDIO_24_IIN_IRQ(20), /* IIN 18-20 */
140 IDIO_24_IIN_IRQ(21), IDIO_24_IIN_IRQ(22), IDIO_24_IIN_IRQ(23), /* IIN 21-23 */
141 IDIO_24_TTL_IRQ(0), IDIO_24_TTL_IRQ(1), IDIO_24_TTL_IRQ(2), /* TTL 0-2 */
142 IDIO_24_TTL_IRQ(3), IDIO_24_TTL_IRQ(4), IDIO_24_TTL_IRQ(5), /* TTL 3-5 */
143 IDIO_24_TTL_IRQ(6), IDIO_24_TTL_IRQ(7), /* TTL 6-7 */
144};
145
146/**
147 * struct idio_24_gpio - GPIO device private data structure
148 * @map: regmap for the device
149 * @lock: synchronization lock to prevent I/O race conditions
150 * @irq_type: type configuration for IRQs
151 */
152struct idio_24_gpio {
153 struct regmap *map;
154 raw_spinlock_t lock;
155 u8 irq_type;
156};
157
158static int idio_24_handle_mask_sync(const int index, const unsigned int mask_buf_def,
159 const unsigned int mask_buf, void *const irq_drv_data)
160{
161 const unsigned int type_mask = COS_ENABLE_BOTH << index;
162 struct idio_24_gpio *const idio24gpio = irq_drv_data;
163 u8 type;
164 int ret;
165
166 raw_spin_lock(&idio24gpio->lock);
167
168 /* if all are masked, then disable interrupts, else set to type */
169 type = (mask_buf == mask_buf_def) ? ~type_mask : idio24gpio->irq_type;
170
171 ret = regmap_update_bits(idio24gpio->map, IDIO_24_COS_ENABLE, type_mask, type);
172
173 raw_spin_unlock(&idio24gpio->lock);
174
175 return ret;
176}
177
178static int idio_24_set_type_config(unsigned int **const buf, const unsigned int type,
179 const struct regmap_irq *const irq_data, const int idx,
180 void *const irq_drv_data)
181{
182 const unsigned int offset = irq_data->reg_offset;
183 const unsigned int rising = COS_ENABLE_RISING << offset;
184 const unsigned int falling = COS_ENABLE_FALLING << offset;
185 const unsigned int mask = COS_ENABLE_BOTH << offset;
186 struct idio_24_gpio *const idio24gpio = irq_drv_data;
187 unsigned int new;
188 unsigned int cos_enable;
189 int ret;
190
191 switch (type) {
192 case IRQ_TYPE_EDGE_RISING:
193 new = rising;
194 break;
195 case IRQ_TYPE_EDGE_FALLING:
196 new = falling;
197 break;
198 case IRQ_TYPE_EDGE_BOTH:
199 new = mask;
200 break;
201 default:
202 return -EINVAL;
203 }
204
205 raw_spin_lock(&idio24gpio->lock);
206
207 /* replace old bitmap with new bitmap */
208 idio24gpio->irq_type = (idio24gpio->irq_type & ~mask) | (new & mask);
209
210 ret = regmap_read(idio24gpio->map, IDIO_24_COS_ENABLE, &cos_enable);
211 if (ret)
212 goto exit_unlock;
213
214 /* if COS is currently enabled then update the edge type */
215 if (cos_enable & mask) {
216 ret = regmap_update_bits(idio24gpio->map, IDIO_24_COS_ENABLE, mask,
217 idio24gpio->irq_type);
218 if (ret)
219 goto exit_unlock;
220 }
221
222exit_unlock:
223 raw_spin_unlock(&idio24gpio->lock);
224
225 return ret;
226}
227
228static int idio_24_reg_mask_xlate(struct gpio_regmap *const gpio, const unsigned int base,
229 const unsigned int offset, unsigned int *const reg,
230 unsigned int *const mask)
231{
232 const unsigned int out_stride = offset / IDIO_24_NGPIO_PER_REG;
233 const unsigned int in_stride = (offset - 24) / IDIO_24_NGPIO_PER_REG;
234 struct regmap *const map = gpio_regmap_get_drvdata(gpio);
235 int err;
236 unsigned int ctrl_reg;
237
238 switch (base) {
239 case IDIO_24_OUT_BASE:
240 *mask = BIT(offset % IDIO_24_NGPIO_PER_REG);
241
242 /* FET Outputs */
243 if (offset < 24) {
244 *reg = IDIO_24_OUT_BASE + out_stride;
245 return 0;
246 }
247
248 /* Isolated Inputs */
249 if (offset < 48) {
250 *reg = IDIO_24_IN_BASE + in_stride;
251 return 0;
252 }
253
254 err = regmap_read(map, IDIO_24_CONTROL_REG, &ctrl_reg);
255 if (err)
256 return err;
257
258 /* TTL/CMOS Outputs */
259 if (ctrl_reg & CONTROL_REG_OUT_MODE) {
260 *reg = IDIO_24_TTLCMOS_OUT_REG;
261 return 0;
262 }
263
264 /* TTL/CMOS Inputs */
265 *reg = IDIO_24_TTLCMOS_IN_REG;
266 return 0;
267 case IDIO_24_CONTROL_REG:
268 /* We can only set direction for TTL/CMOS lines */
269 if (offset < 48)
270 return -ENOTSUPP;
271
272 *reg = IDIO_24_CONTROL_REG;
273 *mask = CONTROL_REG_OUT_MODE;
274 return 0;
275 default:
276 /* Should never reach this path */
277 return -EINVAL;
278 }
279}
280
281#define IDIO_24_NGPIO 56
282static const char *idio_24_names[IDIO_24_NGPIO] = {
283 "OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
284 "OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
285 "OUT16", "OUT17", "OUT18", "OUT19", "OUT20", "OUT21", "OUT22", "OUT23",
286 "IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
287 "IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15",
288 "IIN16", "IIN17", "IIN18", "IIN19", "IIN20", "IIN21", "IIN22", "IIN23",
289 "TTL0", "TTL1", "TTL2", "TTL3", "TTL4", "TTL5", "TTL6", "TTL7"
290};
291
292static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
293{
294 struct device *const dev = &pdev->dev;
295 struct idio_24_gpio *idio24gpio;
296 int err;
297 const size_t pci_plx_bar_index = 1;
298 const size_t pci_bar_index = 2;
299 const char *const name = pci_name(pdev);
300 struct gpio_regmap_config gpio_config = {};
301 void __iomem *pex8311_regs;
302 void __iomem *idio_24_regs;
303 struct regmap *intcsr_map;
304 struct regmap_irq_chip *chip;
305 struct regmap_irq_chip_data *chip_data;
306
307 err = pcim_enable_device(pdev);
308 if (err)
309 return dev_err_probe(dev, err, "Failed to enable PCI device\n");
310
311 pex8311_regs = pcim_iomap_region(pdev, pci_plx_bar_index, "pex8311");
312 if (IS_ERR(pex8311_regs))
313 return dev_err_probe(dev, PTR_ERR(pex8311_regs), "Unable to map PEX 8311 I/O addresses\n");
314
315 idio_24_regs = pcim_iomap_region(pdev, pci_bar_index, name);
316 if (IS_ERR(idio_24_regs))
317 return dev_err_probe(dev, PTR_ERR(idio_24_regs), "Unable to map PCIe-IDIO-24 I/O addresses\n");
318
319 intcsr_map = devm_regmap_init_mmio(dev, pex8311_regs, &pex8311_intcsr_regmap_config);
320 if (IS_ERR(intcsr_map))
321 return dev_err_probe(dev, PTR_ERR(intcsr_map),
322 "Unable to initialize PEX8311 register map\n");
323
324 idio24gpio = devm_kzalloc(dev, sizeof(*idio24gpio), GFP_KERNEL);
325 if (!idio24gpio)
326 return -ENOMEM;
327
328 idio24gpio->map = devm_regmap_init_mmio(dev, idio_24_regs, &idio_24_regmap_config);
329 if (IS_ERR(idio24gpio->map))
330 return dev_err_probe(dev, PTR_ERR(idio24gpio->map),
331 "Unable to initialize register map\n");
332
333 raw_spin_lock_init(&idio24gpio->lock);
334
335 /* Initialize all IRQ type configuration to IRQ_TYPE_EDGE_BOTH */
336 idio24gpio->irq_type = GENMASK(7, 0);
337
338 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
339 if (!chip)
340 return -ENOMEM;
341
342 chip->name = name;
343 chip->status_base = IDIO_24_COS_STATUS_BASE;
344 chip->mask_base = IDIO_24_COS_ENABLE;
345 chip->ack_base = IDIO_24_COS_STATUS_BASE;
346 chip->num_regs = 4;
347 chip->irqs = idio_24_regmap_irqs;
348 chip->num_irqs = ARRAY_SIZE(idio_24_regmap_irqs);
349 chip->handle_mask_sync = idio_24_handle_mask_sync;
350 chip->set_type_config = idio_24_set_type_config;
351 chip->irq_drv_data = idio24gpio;
352
353 /* Software board reset */
354 err = regmap_write(idio24gpio->map, IDIO_24_SOFT_RESET, 0);
355 if (err)
356 return err;
357 /*
358 * enable PLX PEX8311 internal PCI wire interrupt and local interrupt
359 * input
360 */
361 err = regmap_update_bits(intcsr_map, 0x0, IDIO_24_ENABLE_IRQ, IDIO_24_ENABLE_IRQ);
362 if (err)
363 return err;
364
365 err = devm_regmap_add_irq_chip(dev, idio24gpio->map, pdev->irq, 0, 0, chip, &chip_data);
366 if (err)
367 return dev_err_probe(dev, err, "IRQ registration failed\n");
368
369 gpio_config.parent = dev;
370 gpio_config.regmap = idio24gpio->map;
371 gpio_config.ngpio = IDIO_24_NGPIO;
372 gpio_config.names = idio_24_names;
373 gpio_config.reg_dat_base = GPIO_REGMAP_ADDR(IDIO_24_OUT_BASE);
374 gpio_config.reg_set_base = GPIO_REGMAP_ADDR(IDIO_24_OUT_BASE);
375 gpio_config.reg_dir_out_base = GPIO_REGMAP_ADDR(IDIO_24_CONTROL_REG);
376 gpio_config.ngpio_per_reg = IDIO_24_NGPIO_PER_REG;
377 gpio_config.irq_domain = regmap_irq_get_domain(chip_data);
378 gpio_config.reg_mask_xlate = idio_24_reg_mask_xlate;
379 gpio_config.drvdata = idio24gpio->map;
380
381 return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
382}
383
384static const struct pci_device_id idio_24_pci_dev_id[] = {
385 { PCI_DEVICE(0x494F, 0x0FD0) }, { PCI_DEVICE(0x494F, 0x0BD0) },
386 { PCI_DEVICE(0x494F, 0x07D0) }, { PCI_DEVICE(0x494F, 0x0FC0) },
387 { 0 }
388};
389MODULE_DEVICE_TABLE(pci, idio_24_pci_dev_id);
390
391static struct pci_driver idio_24_driver = {
392 .name = "pcie-idio-24",
393 .id_table = idio_24_pci_dev_id,
394 .probe = idio_24_probe
395};
396
397module_pci_driver(idio_24_driver);
398
399MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
400MODULE_DESCRIPTION("ACCES PCIe-IDIO-24 GPIO driver");
401MODULE_LICENSE("GPL v2");