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 20 #define CVMX_SATA_UCTL_SHIM_CFG 0xE8 21 22 #define SATA_UCTL_ENDIAN_MODE_BIG 1 23 #define SATA_UCTL_ENDIAN_MODE_LITTLE 0 24 #define SATA_UCTL_ENDIAN_MODE_MASK 3 25 26 #define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8 27 #define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0 28 #define SATA_UCTL_DMA_READ_CMD_SHIFT 12 29 30 static int ahci_octeon_probe(struct platform_device *pdev) 31 { 32 struct device *dev = &pdev->dev; 33 struct device_node *node = dev->of_node; 34 void __iomem *base; 35 u64 cfg; 36 int ret; 37 38 base = devm_platform_ioremap_resource(pdev, 0); 39 if (IS_ERR(base)) 40 return PTR_ERR(base); 41 42 cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); 43 44 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); 45 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); 46 47 #ifdef __BIG_ENDIAN 48 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 49 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 50 #else 51 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 52 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 53 #endif 54 55 cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; 56 57 cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); 58 59 if (!node) { 60 dev_err(dev, "no device node, failed to add octeon sata\n"); 61 return -ENODEV; 62 } 63 64 ret = of_platform_populate(node, NULL, NULL, dev); 65 if (ret) { 66 dev_err(dev, "failed to add ahci-platform core\n"); 67 return ret; 68 } 69 70 return 0; 71 } 72 73 static const struct of_device_id octeon_ahci_match[] = { 74 { .compatible = "cavium,octeon-7130-sata-uctl", }, 75 { /* sentinel */ } 76 }; 77 MODULE_DEVICE_TABLE(of, octeon_ahci_match); 78 79 static struct platform_driver ahci_octeon_driver = { 80 .probe = ahci_octeon_probe, 81 .driver = { 82 .name = "octeon-ahci", 83 .of_match_table = octeon_ahci_match, 84 }, 85 }; 86 87 module_platform_driver(ahci_octeon_driver); 88 89 MODULE_LICENSE("GPL"); 90 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>"); 91 MODULE_DESCRIPTION("Cavium Inc. sata config."); 92