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Peng Fan03773432016-04-14 21:45:06 +08001/*
2 * Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
3 *
4 * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 *
8 */
9
10/*
11 * Note:
12 * The driver's compatible table is borrowed from Linux Kernel,
13 * but now max supported gpio pins is 24 and only PCA953X_TYPE
14 * is supported. PCA957X_TYPE is not supported now.
15 * Also the Polarity Inversion feature is not supported now.
16 *
17 * TODO:
18 * 1. Support PCA957X_TYPE
mario.six@gdsys.cc71db3272016-04-25 15:25:37 +020019 * 2. Support 24 gpio pins
20 * 3. Support Polarity Inversion
Peng Fan03773432016-04-14 21:45:06 +080021 */
22
23#include <common.h>
24#include <errno.h>
25#include <dm.h>
26#include <fdtdec.h>
27#include <i2c.h>
28#include <malloc.h>
29#include <asm/gpio.h>
30#include <asm/io.h>
31#include <dt-bindings/gpio/gpio.h>
32
33#define PCA953X_INPUT 0
34#define PCA953X_OUTPUT 1
35#define PCA953X_INVERT 2
36#define PCA953X_DIRECTION 3
37
38#define PCA_GPIO_MASK 0x00FF
39#define PCA_INT 0x0100
40#define PCA953X_TYPE 0x1000
41#define PCA957X_TYPE 0x2000
42#define PCA_TYPE_MASK 0xF000
43#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
44
45enum {
46 PCA953X_DIRECTION_IN,
47 PCA953X_DIRECTION_OUT,
48};
49
mario.six@gdsys.cc71db3272016-04-25 15:25:37 +020050#define MAX_BANK 5
Peng Fan03773432016-04-14 21:45:06 +080051#define BANK_SZ 8
52
53DECLARE_GLOBAL_DATA_PTR;
54
55/*
56 * struct pca953x_info - Data for pca953x
57 *
58 * @dev: udevice structure for the device
59 * @addr: i2c slave address
60 * @invert: Polarity inversion or not
61 * @gpio_count: the number of gpio pins that the device supports
62 * @chip_type: indicate the chip type,PCA953X or PCA957X
63 * @bank_count: the number of banks that the device supports
64 * @reg_output: array to hold the value of output registers
65 * @reg_direction: array to hold the value of direction registers
66 */
67struct pca953x_info {
68 struct udevice *dev;
69 int addr;
70 int invert;
71 int gpio_count;
72 int chip_type;
73 int bank_count;
74 u8 reg_output[MAX_BANK];
75 u8 reg_direction[MAX_BANK];
76};
77
78static int pca953x_write_single(struct udevice *dev, int reg, u8 val,
79 int offset)
80{
81 struct pca953x_info *info = dev_get_platdata(dev);
82 int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
83 int off = offset / BANK_SZ;
84 int ret = 0;
85
86 ret = dm_i2c_write(dev, (reg << bank_shift) + off, &val, 1);
87 if (ret) {
88 dev_err(dev, "%s error\n", __func__);
89 return ret;
90 }
91
92 return 0;
93}
94
95static int pca953x_read_single(struct udevice *dev, int reg, u8 *val,
96 int offset)
97{
98 struct pca953x_info *info = dev_get_platdata(dev);
99 int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
100 int off = offset / BANK_SZ;
101 int ret;
102 u8 byte;
103
104 ret = dm_i2c_read(dev, (reg << bank_shift) + off, &byte, 1);
105 if (ret) {
106 dev_err(dev, "%s error\n", __func__);
107 return ret;
108 }
109
110 *val = byte;
111
112 return 0;
113}
114
115static int pca953x_read_regs(struct udevice *dev, int reg, u8 *val)
116{
117 struct pca953x_info *info = dev_get_platdata(dev);
118 int ret = 0;
119
120 if (info->gpio_count <= 8) {
121 ret = dm_i2c_read(dev, reg, val, 1);
122 } else if (info->gpio_count <= 16) {
123 ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
mario.six@gdsys.cc71db3272016-04-25 15:25:37 +0200124 } else if (info->gpio_count == 40) {
125 /* Auto increment */
126 ret = dm_i2c_read(dev, (reg << 3) | 0x80, val, info->bank_count);
Peng Fan03773432016-04-14 21:45:06 +0800127 } else {
128 dev_err(dev, "Unsupported now\n");
129 return -EINVAL;
130 }
131
132 return ret;
133}
134
135static int pca953x_is_output(struct udevice *dev, int offset)
136{
137 struct pca953x_info *info = dev_get_platdata(dev);
138
139 int bank = offset / BANK_SZ;
140 int off = offset % BANK_SZ;
141
142 /*0: output; 1: input */
143 return !(info->reg_direction[bank] & (1 << off));
144}
145
146static int pca953x_get_value(struct udevice *dev, unsigned offset)
147{
148 int ret;
149 u8 val = 0;
150
mario.six@gdsys.ccfc76b692016-05-23 09:54:56 +0200151 int off = offset % BANK_SZ;
152
Peng Fan03773432016-04-14 21:45:06 +0800153 ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset);
154 if (ret)
155 return ret;
156
mario.six@gdsys.ccfc76b692016-05-23 09:54:56 +0200157 return (val >> off) & 0x1;
Peng Fan03773432016-04-14 21:45:06 +0800158}
159
160static int pca953x_set_value(struct udevice *dev, unsigned offset,
161 int value)
162{
163 struct pca953x_info *info = dev_get_platdata(dev);
164 int bank = offset / BANK_SZ;
165 int off = offset % BANK_SZ;
166 u8 val;
167 int ret;
168
169 if (value)
170 val = info->reg_output[bank] | (1 << off);
171 else
172 val = info->reg_output[bank] & ~(1 << off);
173
174 ret = pca953x_write_single(dev, PCA953X_OUTPUT, val, offset);
175 if (ret)
176 return ret;
177
178 info->reg_output[bank] = val;
179
180 return 0;
181}
182
183static int pca953x_set_direction(struct udevice *dev, unsigned offset, int dir)
184{
185 struct pca953x_info *info = dev_get_platdata(dev);
186 int bank = offset / BANK_SZ;
187 int off = offset % BANK_SZ;
188 u8 val;
189 int ret;
190
191 if (dir == PCA953X_DIRECTION_IN)
192 val = info->reg_direction[bank] | (1 << off);
193 else
194 val = info->reg_direction[bank] & ~(1 << off);
195
196 ret = pca953x_write_single(dev, PCA953X_DIRECTION, val, offset);
197 if (ret)
198 return ret;
199
200 info->reg_direction[bank] = val;
201
202 return 0;
203}
204
205static int pca953x_direction_input(struct udevice *dev, unsigned offset)
206{
207 return pca953x_set_direction(dev, offset, PCA953X_DIRECTION_IN);
208}
209
210static int pca953x_direction_output(struct udevice *dev, unsigned offset,
211 int value)
212{
213 /* Configure output value. */
214 pca953x_set_value(dev, offset, value);
215
216 /* Configure direction as output. */
217 pca953x_set_direction(dev, offset, PCA953X_DIRECTION_OUT);
218
219 return 0;
220}
221
222static int pca953x_get_function(struct udevice *dev, unsigned offset)
223{
224 if (pca953x_is_output(dev, offset))
225 return GPIOF_OUTPUT;
226 else
227 return GPIOF_INPUT;
228}
229
230static int pca953x_xlate(struct udevice *dev, struct gpio_desc *desc,
231 struct fdtdec_phandle_args *args)
232{
233 desc->offset = args->args[0];
234 desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
235
236 return 0;
237}
238
239static const struct dm_gpio_ops pca953x_ops = {
240 .direction_input = pca953x_direction_input,
241 .direction_output = pca953x_direction_output,
242 .get_value = pca953x_get_value,
243 .set_value = pca953x_set_value,
244 .get_function = pca953x_get_function,
245 .xlate = pca953x_xlate,
246};
247
248static int pca953x_probe(struct udevice *dev)
249{
250 struct pca953x_info *info = dev_get_platdata(dev);
251 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
252 struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
253 char name[32], *str;
254 int addr;
255 ulong driver_data;
256 int ret;
257
258 if (!info) {
259 dev_err(dev, "platdata not ready\n");
260 return -ENOMEM;
261 }
262
263 if (!chip) {
264 dev_err(dev, "i2c not ready\n");
265 return -ENODEV;
266 }
267
Simon Glasse160f7d2017-01-17 16:52:55 -0700268 addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
Peng Fan03773432016-04-14 21:45:06 +0800269 if (addr == 0)
270 return -ENODEV;
271
272 info->addr = addr;
273
274 driver_data = dev_get_driver_data(dev);
275
276 info->gpio_count = driver_data & PCA_GPIO_MASK;
277 if (info->gpio_count > MAX_BANK * BANK_SZ) {
278 dev_err(dev, "Max support %d pins now\n", MAX_BANK * BANK_SZ);
279 return -EINVAL;
280 }
281
282 info->chip_type = PCA_CHIP_TYPE(driver_data);
283 if (info->chip_type != PCA953X_TYPE) {
284 dev_err(dev, "Only support PCA953X chip type now.\n");
285 return -EINVAL;
286 }
287
288 info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);
289
290 ret = pca953x_read_regs(dev, PCA953X_OUTPUT, info->reg_output);
291 if (ret) {
292 dev_err(dev, "Error reading output register\n");
293 return ret;
294 }
295
296 ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);
297 if (ret) {
298 dev_err(dev, "Error reading direction register\n");
299 return ret;
300 }
301
302 snprintf(name, sizeof(name), "gpio@%x_", info->addr);
303 str = strdup(name);
304 if (!str)
305 return -ENOMEM;
306 uc_priv->bank_name = str;
307 uc_priv->gpio_count = info->gpio_count;
308
309 dev_dbg(dev, "%s is ready\n", str);
310
311 return 0;
312}
313
314#define OF_953X(__nrgpio, __int) (ulong)(__nrgpio | PCA953X_TYPE | __int)
315#define OF_957X(__nrgpio, __int) (ulong)(__nrgpio | PCA957X_TYPE | __int)
316
317static const struct udevice_id pca953x_ids[] = {
318 { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
319 { .compatible = "nxp,pca9534", .data = OF_953X(8, PCA_INT), },
320 { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
321 { .compatible = "nxp,pca9536", .data = OF_953X(4, 0), },
322 { .compatible = "nxp,pca9537", .data = OF_953X(4, PCA_INT), },
323 { .compatible = "nxp,pca9538", .data = OF_953X(8, PCA_INT), },
324 { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
325 { .compatible = "nxp,pca9554", .data = OF_953X(8, PCA_INT), },
326 { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
327 { .compatible = "nxp,pca9556", .data = OF_953X(8, 0), },
328 { .compatible = "nxp,pca9557", .data = OF_953X(8, 0), },
329 { .compatible = "nxp,pca9574", .data = OF_957X(8, PCA_INT), },
330 { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
331 { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
332
333 { .compatible = "maxim,max7310", .data = OF_953X(8, 0), },
334 { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
335 { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
336 { .compatible = "maxim,max7315", .data = OF_953X(8, PCA_INT), },
337
338 { .compatible = "ti,pca6107", .data = OF_953X(8, PCA_INT), },
339 { .compatible = "ti,tca6408", .data = OF_953X(8, PCA_INT), },
340 { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
341 { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
342
343 { .compatible = "onsemi,pca9654", .data = OF_953X(8, PCA_INT), },
344
345 { .compatible = "exar,xra1202", .data = OF_953X(8, 0), },
346 { }
347};
348
349U_BOOT_DRIVER(pca953x) = {
350 .name = "pca953x",
351 .id = UCLASS_GPIO,
352 .ops = &pca953x_ops,
353 .probe = pca953x_probe,
354 .platdata_auto_alloc_size = sizeof(struct pca953x_info),
355 .of_match = pca953x_ids,
356};