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 struct resource *res; 35 void __iomem *base; 36 u64 cfg; 37 int ret; 38 39 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 40 base = devm_ioremap_resource(&pdev->dev, res); 41 if (IS_ERR(base)) 42 return PTR_ERR(base); 43 44 cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); 45 46 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); 47 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); 48 49 #ifdef __BIG_ENDIAN 50 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 51 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 52 #else 53 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 54 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 55 #endif 56 57 cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; 58 59 cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); 60 61 if (!node) { 62 dev_err(dev, "no device node, failed to add octeon sata\n"); 63 return -ENODEV; 64 } 65 66 ret = of_platform_populate(node, NULL, NULL, dev); 67 if (ret) { 68 dev_err(dev, "failed to add ahci-platform core\n"); 69 return ret; 70 } 71 72 return 0; 73 } 74 75 static const struct of_device_id octeon_ahci_match[] = { 76 { .compatible = "cavium,octeon-7130-sata-uctl", }, 77 { /* sentinel */ } 78 }; 79 MODULE_DEVICE_TABLE(of, octeon_ahci_match); 80 81 static struct platform_driver ahci_octeon_driver = { 82 .probe = ahci_octeon_probe, 83 .driver = { 84 .name = "octeon-ahci", 85 .of_match_table = octeon_ahci_match, 86 }, 87 }; 88 89 module_platform_driver(ahci_octeon_driver); 90 91 MODULE_LICENSE("GPL"); 92 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>"); 93 MODULE_DESCRIPTION("Cavium Inc. sata config."); 94