1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2a0c7c1d4SMarc Reilly /*
3a0c7c1d4SMarc Reilly * Copyright 2009-2010 Pengutronix
4a0c7c1d4SMarc Reilly * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
5a0c7c1d4SMarc Reilly *
6a0c7c1d4SMarc Reilly * loosely based on an earlier driver that has
7a0c7c1d4SMarc Reilly * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
8a0c7c1d4SMarc Reilly */
9a0c7c1d4SMarc Reilly
10a0c7c1d4SMarc Reilly #include <linux/slab.h>
11a0c7c1d4SMarc Reilly #include <linux/module.h>
12a0c7c1d4SMarc Reilly #include <linux/platform_device.h>
13a0c7c1d4SMarc Reilly #include <linux/interrupt.h>
14a0c7c1d4SMarc Reilly #include <linux/mfd/core.h>
15a0c7c1d4SMarc Reilly #include <linux/mfd/mc13xxx.h>
16a0c7c1d4SMarc Reilly #include <linux/of.h>
17a0c7c1d4SMarc Reilly #include <linux/of_device.h>
18a0c7c1d4SMarc Reilly #include <linux/err.h>
19a0c7c1d4SMarc Reilly #include <linux/spi/spi.h>
20a0c7c1d4SMarc Reilly
21a0c7c1d4SMarc Reilly #include "mc13xxx.h"
22a0c7c1d4SMarc Reilly
23a0c7c1d4SMarc Reilly static const struct spi_device_id mc13xxx_device_id[] = {
24a0c7c1d4SMarc Reilly {
25a0c7c1d4SMarc Reilly .name = "mc13783",
26cd0f34b0SUwe Kleine-König .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13783,
27a0c7c1d4SMarc Reilly }, {
28a0c7c1d4SMarc Reilly .name = "mc13892",
29cd0f34b0SUwe Kleine-König .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
30a0c7c1d4SMarc Reilly }, {
310312e024SUwe Kleine-König .name = "mc34708",
320312e024SUwe Kleine-König .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
33a0c7c1d4SMarc Reilly }, {
34a0c7c1d4SMarc Reilly /* sentinel */
35a0c7c1d4SMarc Reilly }
36a0c7c1d4SMarc Reilly };
37a0c7c1d4SMarc Reilly MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
38a0c7c1d4SMarc Reilly
39a0c7c1d4SMarc Reilly static const struct of_device_id mc13xxx_dt_ids[] = {
40cd0f34b0SUwe Kleine-König { .compatible = "fsl,mc13783", .data = &mc13xxx_variant_mc13783, },
41cd0f34b0SUwe Kleine-König { .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, },
420312e024SUwe Kleine-König { .compatible = "fsl,mc34708", .data = &mc13xxx_variant_mc34708, },
43a0c7c1d4SMarc Reilly { /* sentinel */ }
44a0c7c1d4SMarc Reilly };
45a0c7c1d4SMarc Reilly MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
46a0c7c1d4SMarc Reilly
4718dd21abSKrzysztof Kozlowski static const struct regmap_config mc13xxx_regmap_spi_config = {
48a0c7c1d4SMarc Reilly .reg_bits = 7,
49a0c7c1d4SMarc Reilly .pad_bits = 1,
50a0c7c1d4SMarc Reilly .val_bits = 24,
5177a5b370SPhilippe Rétornaz .write_flag_mask = 0x80,
52a0c7c1d4SMarc Reilly
53a0c7c1d4SMarc Reilly .max_register = MC13XXX_NUMREGS,
54a0c7c1d4SMarc Reilly
55a0c7c1d4SMarc Reilly .cache_type = REGCACHE_NONE,
561c96a2f6SDavid Frey .use_single_read = true,
571c96a2f6SDavid Frey .use_single_write = true,
58e4ecf6eaSPhilippe Rétornaz };
59e4ecf6eaSPhilippe Rétornaz
mc13xxx_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)60e4ecf6eaSPhilippe Rétornaz static int mc13xxx_spi_read(void *context, const void *reg, size_t reg_size,
61e4ecf6eaSPhilippe Rétornaz void *val, size_t val_size)
62e4ecf6eaSPhilippe Rétornaz {
63e4ecf6eaSPhilippe Rétornaz unsigned char w[4] = { *((unsigned char *) reg), 0, 0, 0};
64e4ecf6eaSPhilippe Rétornaz unsigned char r[4];
65e4ecf6eaSPhilippe Rétornaz unsigned char *p = val;
66e4ecf6eaSPhilippe Rétornaz struct device *dev = context;
67e4ecf6eaSPhilippe Rétornaz struct spi_device *spi = to_spi_device(dev);
68e4ecf6eaSPhilippe Rétornaz struct spi_transfer t = {
69e4ecf6eaSPhilippe Rétornaz .tx_buf = w,
70e4ecf6eaSPhilippe Rétornaz .rx_buf = r,
71e4ecf6eaSPhilippe Rétornaz .len = 4,
72e4ecf6eaSPhilippe Rétornaz };
73e4ecf6eaSPhilippe Rétornaz
74e4ecf6eaSPhilippe Rétornaz struct spi_message m;
75e4ecf6eaSPhilippe Rétornaz int ret;
76e4ecf6eaSPhilippe Rétornaz
77e4ecf6eaSPhilippe Rétornaz if (val_size != 3 || reg_size != 1)
78e4ecf6eaSPhilippe Rétornaz return -ENOTSUPP;
79e4ecf6eaSPhilippe Rétornaz
80e4ecf6eaSPhilippe Rétornaz spi_message_init(&m);
81e4ecf6eaSPhilippe Rétornaz spi_message_add_tail(&t, &m);
82e4ecf6eaSPhilippe Rétornaz ret = spi_sync(spi, &m);
83e4ecf6eaSPhilippe Rétornaz
84e4ecf6eaSPhilippe Rétornaz memcpy(p, &r[1], 3);
85e4ecf6eaSPhilippe Rétornaz
86e4ecf6eaSPhilippe Rétornaz return ret;
87e4ecf6eaSPhilippe Rétornaz }
88e4ecf6eaSPhilippe Rétornaz
mc13xxx_spi_write(void * context,const void * data,size_t count)89e4ecf6eaSPhilippe Rétornaz static int mc13xxx_spi_write(void *context, const void *data, size_t count)
90e4ecf6eaSPhilippe Rétornaz {
91e4ecf6eaSPhilippe Rétornaz struct device *dev = context;
92e4ecf6eaSPhilippe Rétornaz struct spi_device *spi = to_spi_device(dev);
93fd792f8fSMark Brown const char *reg = data;
94e4ecf6eaSPhilippe Rétornaz
95e4ecf6eaSPhilippe Rétornaz if (count != 4)
96e4ecf6eaSPhilippe Rétornaz return -ENOTSUPP;
97e4ecf6eaSPhilippe Rétornaz
98fd792f8fSMark Brown /* include errata fix for spi audio problems */
99fd792f8fSMark Brown if (*reg == MC13783_AUDIO_CODEC || *reg == MC13783_AUDIO_DAC)
100fd792f8fSMark Brown spi_write(spi, data, count);
101fd792f8fSMark Brown
102e4ecf6eaSPhilippe Rétornaz return spi_write(spi, data, count);
103e4ecf6eaSPhilippe Rétornaz }
104e4ecf6eaSPhilippe Rétornaz
105e4ecf6eaSPhilippe Rétornaz /*
106e4ecf6eaSPhilippe Rétornaz * We cannot use regmap-spi generic bus implementation here.
107e4ecf6eaSPhilippe Rétornaz * The MC13783 chip will get corrupted if CS signal is deasserted
108e4ecf6eaSPhilippe Rétornaz * and on i.Mx31 SoC (the target SoC for MC13783 PMIC) the SPI controller
109e4ecf6eaSPhilippe Rétornaz * has the following errata (DSPhl22960):
110e4ecf6eaSPhilippe Rétornaz * "The CSPI negates SS when the FIFO becomes empty with
111e4ecf6eaSPhilippe Rétornaz * SSCTL= 0. Software cannot guarantee that the FIFO will not
112e4ecf6eaSPhilippe Rétornaz * drain because of higher priority interrupts and the
113e4ecf6eaSPhilippe Rétornaz * non-realtime characteristics of the operating system. As a
114e4ecf6eaSPhilippe Rétornaz * result, the SS will negate before all of the data has been
115e4ecf6eaSPhilippe Rétornaz * transferred to/from the peripheral."
116e4ecf6eaSPhilippe Rétornaz * We workaround this by accessing the SPI controller with a
117*0a5219f3SJonathan Neuschäfer * single transfer.
118e4ecf6eaSPhilippe Rétornaz */
119e4ecf6eaSPhilippe Rétornaz
120e4ecf6eaSPhilippe Rétornaz static struct regmap_bus regmap_mc13xxx_bus = {
121e4ecf6eaSPhilippe Rétornaz .write = mc13xxx_spi_write,
122e4ecf6eaSPhilippe Rétornaz .read = mc13xxx_spi_read,
123a0c7c1d4SMarc Reilly };
124a0c7c1d4SMarc Reilly
mc13xxx_spi_probe(struct spi_device * spi)125a0c7c1d4SMarc Reilly static int mc13xxx_spi_probe(struct spi_device *spi)
126a0c7c1d4SMarc Reilly {
127a0c7c1d4SMarc Reilly struct mc13xxx *mc13xxx;
128a0c7c1d4SMarc Reilly int ret;
129a0c7c1d4SMarc Reilly
130e7c706b1SAxel Lin mc13xxx = devm_kzalloc(&spi->dev, sizeof(*mc13xxx), GFP_KERNEL);
131a0c7c1d4SMarc Reilly if (!mc13xxx)
132a0c7c1d4SMarc Reilly return -ENOMEM;
133a0c7c1d4SMarc Reilly
134db9ef449SAlexander Shiyan dev_set_drvdata(&spi->dev, mc13xxx);
135db9ef449SAlexander Shiyan
136a0c7c1d4SMarc Reilly spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
137a0c7c1d4SMarc Reilly
138db9ef449SAlexander Shiyan mc13xxx->irq = spi->irq;
139a0c7c1d4SMarc Reilly
1400cfe5c90SAlexander Shiyan spi->max_speed_hz = spi->max_speed_hz ? : 26000000;
1416a5926e6SAlexander Shiyan ret = spi_setup(spi);
1426a5926e6SAlexander Shiyan if (ret)
1436a5926e6SAlexander Shiyan return ret;
1440cfe5c90SAlexander Shiyan
145e0308897SAxel Lin mc13xxx->regmap = devm_regmap_init(&spi->dev, ®map_mc13xxx_bus,
146e0308897SAxel Lin &spi->dev,
147e0308897SAxel Lin &mc13xxx_regmap_spi_config);
148a0c7c1d4SMarc Reilly if (IS_ERR(mc13xxx->regmap)) {
149a0c7c1d4SMarc Reilly ret = PTR_ERR(mc13xxx->regmap);
150db9ef449SAlexander Shiyan dev_err(&spi->dev, "Failed to initialize regmap: %d\n", ret);
151a0c7c1d4SMarc Reilly return ret;
152a0c7c1d4SMarc Reilly }
153a0c7c1d4SMarc Reilly
154cd0f34b0SUwe Kleine-König if (spi->dev.of_node) {
155cd0f34b0SUwe Kleine-König const struct of_device_id *of_id =
156cd0f34b0SUwe Kleine-König of_match_device(mc13xxx_dt_ids, &spi->dev);
157a0c7c1d4SMarc Reilly
158cd0f34b0SUwe Kleine-König mc13xxx->variant = of_id->data;
159a0c7c1d4SMarc Reilly } else {
160cd0f34b0SUwe Kleine-König const struct spi_device_id *id_entry = spi_get_device_id(spi);
161cd0f34b0SUwe Kleine-König
162cd0f34b0SUwe Kleine-König mc13xxx->variant = (void *)id_entry->driver_data;
163a0c7c1d4SMarc Reilly }
164a0c7c1d4SMarc Reilly
165db9ef449SAlexander Shiyan return mc13xxx_common_init(&spi->dev);
166a0c7c1d4SMarc Reilly }
167a0c7c1d4SMarc Reilly
mc13xxx_spi_remove(struct spi_device * spi)168a0386bbaSUwe Kleine-König static void mc13xxx_spi_remove(struct spi_device *spi)
169a0c7c1d4SMarc Reilly {
170c39cf60fSUwe Kleine-König mc13xxx_common_exit(&spi->dev);
171a0c7c1d4SMarc Reilly }
172a0c7c1d4SMarc Reilly
173a0c7c1d4SMarc Reilly static struct spi_driver mc13xxx_spi_driver = {
174a0c7c1d4SMarc Reilly .id_table = mc13xxx_device_id,
175a0c7c1d4SMarc Reilly .driver = {
176a0c7c1d4SMarc Reilly .name = "mc13xxx",
177a0c7c1d4SMarc Reilly .of_match_table = mc13xxx_dt_ids,
178a0c7c1d4SMarc Reilly },
179a0c7c1d4SMarc Reilly .probe = mc13xxx_spi_probe,
18084449216SBill Pemberton .remove = mc13xxx_spi_remove,
181a0c7c1d4SMarc Reilly };
182a0c7c1d4SMarc Reilly
mc13xxx_init(void)183a0c7c1d4SMarc Reilly static int __init mc13xxx_init(void)
184a0c7c1d4SMarc Reilly {
185a0c7c1d4SMarc Reilly return spi_register_driver(&mc13xxx_spi_driver);
186a0c7c1d4SMarc Reilly }
187a0c7c1d4SMarc Reilly subsys_initcall(mc13xxx_init);
188a0c7c1d4SMarc Reilly
mc13xxx_exit(void)189a0c7c1d4SMarc Reilly static void __exit mc13xxx_exit(void)
190a0c7c1d4SMarc Reilly {
191a0c7c1d4SMarc Reilly spi_unregister_driver(&mc13xxx_spi_driver);
192a0c7c1d4SMarc Reilly }
193a0c7c1d4SMarc Reilly module_exit(mc13xxx_exit);
194a0c7c1d4SMarc Reilly
195a0c7c1d4SMarc Reilly MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
196a0c7c1d4SMarc Reilly MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
197a0c7c1d4SMarc Reilly MODULE_LICENSE("GPL v2");
198