projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5e63dcc7 EA |
1 | /* |
| 2 | * Copyright (C) 2015 Broadcom | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License as published by | |
| 6 | * the Free Software Foundation; either version 2 of the License, or | |
| 7 | * (at your option) any later version. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/clk.h> | |
| 16 | #include <linux/clk-provider.h> | |
| 17 | #include <linux/clk/bcm2835.h> | |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/platform_device.h> | |
| 20 | #include <dt-bindings/clock/bcm2835-aux.h> | |
| 21 | ||
| 22 | #define BCM2835_AUXIRQ 0x00 | |
| 23 | #define BCM2835_AUXENB 0x04 | |
| 24 | ||
| 25 | static int bcm2835_aux_clk_probe(struct platform_device *pdev) | |
| 26 | { | |
| 27 | struct device *dev = &pdev->dev; | |
| 28 | struct clk_onecell_data *onecell; | |
| 29 | const char *parent; | |
| 30 | struct clk *parent_clk; | |
| 31 | struct resource *res; | |
| 32 | void __iomem *reg, *gate; | |
| 33 | ||
| 34 | parent_clk = devm_clk_get(dev, NULL); | |
| 35 | if (IS_ERR(parent_clk)) | |
| 36 | return PTR_ERR(parent_clk); | |
| 37 | parent = __clk_get_name(parent_clk); | |
| 38 | ||
| 39 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 40 | reg = devm_ioremap_resource(dev, res); | |
| 4d3ac666 VZ |
41 | if (IS_ERR(reg)) |
| 42 | return PTR_ERR(reg); | |
| 5e63dcc7 EA |
43 | |
| 44 | onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL); | |
| 45 | if (!onecell) | |
| 46 | return -ENOMEM; | |
| 47 | onecell->clk_num = BCM2835_AUX_CLOCK_COUNT; | |
| 48 | onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT, | |
| 49 | sizeof(*onecell->clks), GFP_KERNEL); | |
| 50 | if (!onecell->clks) | |
| 51 | return -ENOMEM; | |
| 52 | ||
| 53 | gate = reg + BCM2835_AUXENB; | |
| 54 | onecell->clks[BCM2835_AUX_CLOCK_UART] = | |
| 55 | clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL); | |
| 56 | ||
| 57 | onecell->clks[BCM2835_AUX_CLOCK_SPI1] = | |
| 58 | clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL); | |
| 59 | ||
| 60 | onecell->clks[BCM2835_AUX_CLOCK_SPI2] = | |
| 61 | clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL); | |
| 62 | ||
| 63 | of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell); | |
| 64 | ||
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | static const struct of_device_id bcm2835_aux_clk_of_match[] = { | |
| 69 | { .compatible = "brcm,bcm2835-aux", }, | |
| 70 | {}, | |
| 71 | }; | |
| 72 | MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match); | |
| 73 | ||
| 74 | static struct platform_driver bcm2835_aux_clk_driver = { | |
| 75 | .driver = { | |
| 76 | .name = "bcm2835-aux-clk", | |
| 77 | .of_match_table = bcm2835_aux_clk_of_match, | |
| 78 | }, | |
| 79 | .probe = bcm2835_aux_clk_probe, | |
| 80 | }; | |
| 81 | builtin_platform_driver(bcm2835_aux_clk_driver); | |
| 82 | ||
| 83 | MODULE_AUTHOR("Eric Anholt <[email protected]>"); | |
| 84 | MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver"); | |
| 85 | MODULE_LICENSE("GPL v2"); |