1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright (C) 2012 John Crispin <john@phrozen.org> 5 */ 6 7 #include <linux/err.h> 8 #include <linux/export.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/mod_devicetable.h> 11 #include <linux/platform_device.h> 12 #include <linux/dma-mapping.h> 13 14 #include <lantiq_soc.h> 15 16 static unsigned int *cp1_base; 17 18 unsigned int *ltq_get_cp1_base(void) 19 { 20 if (!cp1_base) 21 panic("no cp1 base was set\n"); 22 23 return cp1_base; 24 } 25 EXPORT_SYMBOL(ltq_get_cp1_base); 26 27 static int vmmc_probe(struct platform_device *pdev) 28 { 29 #define CP1_SIZE (1 << 20) 30 struct gpio_desc *gpio; 31 int gpio_count; 32 dma_addr_t dma; 33 int error; 34 35 cp1_base = 36 (void *) CPHYSADDR(dma_alloc_coherent(&pdev->dev, CP1_SIZE, 37 &dma, GFP_KERNEL)); 38 39 gpio_count = gpiod_count(&pdev->dev, NULL); 40 while (gpio_count > 0) { 41 gpio = devm_gpiod_get_index(&pdev->dev, 42 NULL, --gpio_count, GPIOD_OUT_HIGH); 43 error = PTR_ERR_OR_ZERO(gpio); 44 if (error) { 45 dev_err(&pdev->dev, 46 "failed to request GPIO idx %d: %d\n", 47 gpio_count, error); 48 continue; 49 } 50 51 gpiod_set_consumer_name(gpio, "vmmc-relay"); 52 } 53 54 dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base); 55 56 return 0; 57 } 58 59 static const struct of_device_id vmmc_match[] = { 60 { .compatible = "lantiq,vmmc-xway" }, 61 {}, 62 }; 63 64 static struct platform_driver vmmc_driver = { 65 .probe = vmmc_probe, 66 .driver = { 67 .name = "lantiq,vmmc", 68 .of_match_table = vmmc_match, 69 }, 70 }; 71 builtin_platform_driver(vmmc_driver); 72