1 /* 2 * SATA glue for Cavium Octeon III SOCs. 3 * 4 * 5 * This file is subject to the terms and conditions of the GNU General Public 6 * License. See the file "COPYING" in the main directory of this archive 7 * for more details. 8 * 9 * Copyright (C) 2010-2015 Cavium Networks 10 * 11 */ 12 13 #include <linux/module.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/platform_device.h> 16 #include <linux/of_platform.h> 17 18 #include <asm/octeon/octeon.h> 19 #include <asm/bitfield.h> 20 21 #define CVMX_SATA_UCTL_SHIM_CFG 0xE8 22 23 #define SATA_UCTL_ENDIAN_MODE_BIG 1 24 #define SATA_UCTL_ENDIAN_MODE_LITTLE 0 25 #define SATA_UCTL_ENDIAN_MODE_MASK 3 26 27 #define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8 28 #define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0 29 #define SATA_UCTL_DMA_READ_CMD_SHIFT 12 30 31 static int ahci_octeon_probe(struct platform_device *pdev) 32 { 33 struct device *dev = &pdev->dev; 34 struct device_node *node = dev->of_node; 35 struct resource *res; 36 void __iomem *base; 37 u64 cfg; 38 int ret; 39 40 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 41 if (!res) { 42 dev_err(&pdev->dev, "Platform resource[0] is missing\n"); 43 return -ENODEV; 44 } 45 46 base = devm_ioremap_resource(&pdev->dev, res); 47 if (IS_ERR(base)) 48 return PTR_ERR(base); 49 50 cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); 51 52 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); 53 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); 54 55 #ifdef __BIG_ENDIAN 56 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 57 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 58 #else 59 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 60 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 61 #endif 62 63 cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; 64 65 cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); 66 67 if (!node) { 68 dev_err(dev, "no device node, failed to add octeon sata\n"); 69 return -ENODEV; 70 } 71 72 ret = of_platform_populate(node, NULL, NULL, dev); 73 if (ret) { 74 dev_err(dev, "failed to add ahci-platform core\n"); 75 return ret; 76 } 77 78 return 0; 79 } 80 81 static int ahci_octeon_remove(struct platform_device *pdev) 82 { 83 return 0; 84 } 85 86 static const struct of_device_id octeon_ahci_match[] = { 87 { .compatible = "cavium,octeon-7130-sata-uctl", }, 88 {}, 89 }; 90 MODULE_DEVICE_TABLE(of, octeon_ahci_match); 91 92 static struct platform_driver ahci_octeon_driver = { 93 .probe = ahci_octeon_probe, 94 .remove = ahci_octeon_remove, 95 .driver = { 96 .name = "octeon-ahci", 97 .of_match_table = octeon_ahci_match, 98 }, 99 }; 100 101 module_platform_driver(ahci_octeon_driver); 102 103 MODULE_LICENSE("GPL"); 104 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>"); 105 MODULE_DESCRIPTION("Cavium Inc. sata config."); 106