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/module.h> 18 #include <linux/platform_device.h> 19 #include <dt-bindings/clock/bcm2835-aux.h> 20 21 #define BCM2835_AUXIRQ 0x00 22 #define BCM2835_AUXENB 0x04 23 24 static int bcm2835_aux_clk_probe(struct platform_device *pdev) 25 { 26 struct device *dev = &pdev->dev; 27 struct clk_hw_onecell_data *onecell; 28 const char *parent; 29 struct clk *parent_clk; 30 struct resource *res; 31 void __iomem *reg, *gate; 32 33 parent_clk = devm_clk_get(dev, NULL); 34 if (IS_ERR(parent_clk)) 35 return PTR_ERR(parent_clk); 36 parent = __clk_get_name(parent_clk); 37 38 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 39 reg = devm_ioremap_resource(dev, res); 40 if (IS_ERR(reg)) 41 return PTR_ERR(reg); 42 43 onecell = devm_kmalloc(dev, 44 struct_size(onecell, hws, 45 BCM2835_AUX_CLOCK_COUNT), 46 GFP_KERNEL); 47 if (!onecell) 48 return -ENOMEM; 49 onecell->num = BCM2835_AUX_CLOCK_COUNT; 50 51 gate = reg + BCM2835_AUXENB; 52 onecell->hws[BCM2835_AUX_CLOCK_UART] = 53 clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL); 54 55 onecell->hws[BCM2835_AUX_CLOCK_SPI1] = 56 clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL); 57 58 onecell->hws[BCM2835_AUX_CLOCK_SPI2] = 59 clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL); 60 61 return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get, 62 onecell); 63 } 64 65 static const struct of_device_id bcm2835_aux_clk_of_match[] = { 66 { .compatible = "brcm,bcm2835-aux", }, 67 {}, 68 }; 69 MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match); 70 71 static struct platform_driver bcm2835_aux_clk_driver = { 72 .driver = { 73 .name = "bcm2835-aux-clk", 74 .of_match_table = bcm2835_aux_clk_of_match, 75 }, 76 .probe = bcm2835_aux_clk_probe, 77 }; 78 builtin_platform_driver(bcm2835_aux_clk_driver); 79 80 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 81 MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver"); 82 MODULE_LICENSE("GPL v2"); 83