1caab277bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
22c86e9fbSBoris Brezillon /*
32c86e9fbSBoris Brezillon * Copyright (C) 2014 Free Electrons
42c86e9fbSBoris Brezillon * Copyright (C) 2014 Atmel
52c86e9fbSBoris Brezillon *
62c86e9fbSBoris Brezillon * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
72c86e9fbSBoris Brezillon */
82c86e9fbSBoris Brezillon
92c86e9fbSBoris Brezillon #include <linux/clk.h>
10ea31c0cfSBoris Brezillon #include <linux/iopoll.h>
112c86e9fbSBoris Brezillon #include <linux/mfd/atmel-hlcdc.h>
122c86e9fbSBoris Brezillon #include <linux/mfd/core.h>
132c86e9fbSBoris Brezillon #include <linux/module.h>
14ac316725SRandy Dunlap #include <linux/mod_devicetable.h>
152c86e9fbSBoris Brezillon #include <linux/platform_device.h>
162c86e9fbSBoris Brezillon #include <linux/regmap.h>
172c86e9fbSBoris Brezillon
182c86e9fbSBoris Brezillon #define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4)
192c86e9fbSBoris Brezillon
20ea31c0cfSBoris Brezillon struct atmel_hlcdc_regmap {
21ea31c0cfSBoris Brezillon void __iomem *regs;
224b1ca3a4SClaudiu Beznea struct device *dev;
23ea31c0cfSBoris Brezillon };
24ea31c0cfSBoris Brezillon
252c86e9fbSBoris Brezillon static const struct mfd_cell atmel_hlcdc_cells[] = {
262c86e9fbSBoris Brezillon {
272c86e9fbSBoris Brezillon .name = "atmel-hlcdc-pwm",
282c86e9fbSBoris Brezillon .of_compatible = "atmel,hlcdc-pwm",
292c86e9fbSBoris Brezillon },
302c86e9fbSBoris Brezillon {
312c86e9fbSBoris Brezillon .name = "atmel-hlcdc-dc",
322c86e9fbSBoris Brezillon .of_compatible = "atmel,hlcdc-display-controller",
332c86e9fbSBoris Brezillon },
342c86e9fbSBoris Brezillon };
352c86e9fbSBoris Brezillon
regmap_atmel_hlcdc_reg_write(void * context,unsigned int reg,unsigned int val)36ea31c0cfSBoris Brezillon static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
37ea31c0cfSBoris Brezillon unsigned int val)
38ea31c0cfSBoris Brezillon {
39ea31c0cfSBoris Brezillon struct atmel_hlcdc_regmap *hregmap = context;
40ea31c0cfSBoris Brezillon
41ea31c0cfSBoris Brezillon if (reg <= ATMEL_HLCDC_DIS) {
42ea31c0cfSBoris Brezillon u32 status;
4310f91676SClaudiu Beznea int ret;
44ea31c0cfSBoris Brezillon
4510f91676SClaudiu Beznea ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
4610f91676SClaudiu Beznea status,
4710f91676SClaudiu Beznea !(status & ATMEL_HLCDC_SIP),
482c2469bcSBoris Brezillon 1, 100);
4910f91676SClaudiu Beznea if (ret) {
5010f91676SClaudiu Beznea dev_err(hregmap->dev,
5110f91676SClaudiu Beznea "Timeout! Clock domain synchronization is in progress!\n");
5210f91676SClaudiu Beznea return ret;
5310f91676SClaudiu Beznea }
54ea31c0cfSBoris Brezillon }
55ea31c0cfSBoris Brezillon
56ea31c0cfSBoris Brezillon writel(val, hregmap->regs + reg);
57ea31c0cfSBoris Brezillon
58ea31c0cfSBoris Brezillon return 0;
59ea31c0cfSBoris Brezillon }
60ea31c0cfSBoris Brezillon
regmap_atmel_hlcdc_reg_read(void * context,unsigned int reg,unsigned int * val)61ea31c0cfSBoris Brezillon static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
62ea31c0cfSBoris Brezillon unsigned int *val)
63ea31c0cfSBoris Brezillon {
64ea31c0cfSBoris Brezillon struct atmel_hlcdc_regmap *hregmap = context;
65ea31c0cfSBoris Brezillon
66ea31c0cfSBoris Brezillon *val = readl(hregmap->regs + reg);
67ea31c0cfSBoris Brezillon
68ea31c0cfSBoris Brezillon return 0;
69ea31c0cfSBoris Brezillon }
70ea31c0cfSBoris Brezillon
712c86e9fbSBoris Brezillon static const struct regmap_config atmel_hlcdc_regmap_config = {
722c86e9fbSBoris Brezillon .reg_bits = 32,
732c86e9fbSBoris Brezillon .val_bits = 32,
742c86e9fbSBoris Brezillon .reg_stride = 4,
752c86e9fbSBoris Brezillon .max_register = ATMEL_HLCDC_REG_MAX,
76ea31c0cfSBoris Brezillon .reg_write = regmap_atmel_hlcdc_reg_write,
77ea31c0cfSBoris Brezillon .reg_read = regmap_atmel_hlcdc_reg_read,
78ea31c0cfSBoris Brezillon .fast_io = true,
792c86e9fbSBoris Brezillon };
802c86e9fbSBoris Brezillon
atmel_hlcdc_probe(struct platform_device * pdev)812c86e9fbSBoris Brezillon static int atmel_hlcdc_probe(struct platform_device *pdev)
822c86e9fbSBoris Brezillon {
83ea31c0cfSBoris Brezillon struct atmel_hlcdc_regmap *hregmap;
842c86e9fbSBoris Brezillon struct device *dev = &pdev->dev;
852c86e9fbSBoris Brezillon struct atmel_hlcdc *hlcdc;
86ea31c0cfSBoris Brezillon
87ea31c0cfSBoris Brezillon hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
88ea31c0cfSBoris Brezillon if (!hregmap)
89ea31c0cfSBoris Brezillon return -ENOMEM;
902c86e9fbSBoris Brezillon
912c86e9fbSBoris Brezillon hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
922c86e9fbSBoris Brezillon if (!hlcdc)
932c86e9fbSBoris Brezillon return -ENOMEM;
942c86e9fbSBoris Brezillon
95*8e950a60SYangtao Li hregmap->regs = devm_platform_ioremap_resource(pdev, 0);
96ea31c0cfSBoris Brezillon if (IS_ERR(hregmap->regs))
97ea31c0cfSBoris Brezillon return PTR_ERR(hregmap->regs);
982c86e9fbSBoris Brezillon
994b1ca3a4SClaudiu Beznea hregmap->dev = &pdev->dev;
1004b1ca3a4SClaudiu Beznea
1012c86e9fbSBoris Brezillon hlcdc->irq = platform_get_irq(pdev, 0);
1022c86e9fbSBoris Brezillon if (hlcdc->irq < 0)
1032c86e9fbSBoris Brezillon return hlcdc->irq;
1042c86e9fbSBoris Brezillon
1052c86e9fbSBoris Brezillon hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
1062c86e9fbSBoris Brezillon if (IS_ERR(hlcdc->periph_clk)) {
1072c86e9fbSBoris Brezillon dev_err(dev, "failed to get peripheral clock\n");
1082c86e9fbSBoris Brezillon return PTR_ERR(hlcdc->periph_clk);
1092c86e9fbSBoris Brezillon }
1102c86e9fbSBoris Brezillon
1112c86e9fbSBoris Brezillon hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
1122c86e9fbSBoris Brezillon if (IS_ERR(hlcdc->sys_clk)) {
1132c86e9fbSBoris Brezillon dev_err(dev, "failed to get system clock\n");
1142c86e9fbSBoris Brezillon return PTR_ERR(hlcdc->sys_clk);
1152c86e9fbSBoris Brezillon }
1162c86e9fbSBoris Brezillon
1172c86e9fbSBoris Brezillon hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
1182c86e9fbSBoris Brezillon if (IS_ERR(hlcdc->slow_clk)) {
1192c86e9fbSBoris Brezillon dev_err(dev, "failed to get slow clock\n");
1202c86e9fbSBoris Brezillon return PTR_ERR(hlcdc->slow_clk);
1212c86e9fbSBoris Brezillon }
1222c86e9fbSBoris Brezillon
123ea31c0cfSBoris Brezillon hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
1242c86e9fbSBoris Brezillon &atmel_hlcdc_regmap_config);
1252c86e9fbSBoris Brezillon if (IS_ERR(hlcdc->regmap))
1262c86e9fbSBoris Brezillon return PTR_ERR(hlcdc->regmap);
1272c86e9fbSBoris Brezillon
1282c86e9fbSBoris Brezillon dev_set_drvdata(dev, hlcdc);
1292c86e9fbSBoris Brezillon
130f32fb9a5SLaxman Dewangan return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
1312c86e9fbSBoris Brezillon ARRAY_SIZE(atmel_hlcdc_cells),
1322c86e9fbSBoris Brezillon NULL, 0, NULL);
1332c86e9fbSBoris Brezillon }
1342c86e9fbSBoris Brezillon
1352c86e9fbSBoris Brezillon static const struct of_device_id atmel_hlcdc_match[] = {
136d9c93f5dSBoris Brezillon { .compatible = "atmel,at91sam9n12-hlcdc" },
137d9c93f5dSBoris Brezillon { .compatible = "atmel,at91sam9x5-hlcdc" },
138d9c93f5dSBoris Brezillon { .compatible = "atmel,sama5d2-hlcdc" },
1392c86e9fbSBoris Brezillon { .compatible = "atmel,sama5d3-hlcdc" },
140d9c93f5dSBoris Brezillon { .compatible = "atmel,sama5d4-hlcdc" },
1411e8c1585SClaudiu Beznea { .compatible = "microchip,sam9x60-hlcdc" },
1422c86e9fbSBoris Brezillon { /* sentinel */ },
1432c86e9fbSBoris Brezillon };
144a0aef1f5SLuis de Bethencourt MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);
1452c86e9fbSBoris Brezillon
1462c86e9fbSBoris Brezillon static struct platform_driver atmel_hlcdc_driver = {
1472c86e9fbSBoris Brezillon .probe = atmel_hlcdc_probe,
1482c86e9fbSBoris Brezillon .driver = {
1492c86e9fbSBoris Brezillon .name = "atmel-hlcdc",
1502c86e9fbSBoris Brezillon .of_match_table = atmel_hlcdc_match,
1512c86e9fbSBoris Brezillon },
1522c86e9fbSBoris Brezillon };
1532c86e9fbSBoris Brezillon module_platform_driver(atmel_hlcdc_driver);
1542c86e9fbSBoris Brezillon
1552c86e9fbSBoris Brezillon MODULE_ALIAS("platform:atmel-hlcdc");
1562c86e9fbSBoris Brezillon MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1572c86e9fbSBoris Brezillon MODULE_DESCRIPTION("Atmel HLCDC driver");
1582c86e9fbSBoris Brezillon MODULE_LICENSE("GPL v2");
159