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 base = devm_ioremap_resource(&pdev->dev, res); 42 if (IS_ERR(base)) 43 return PTR_ERR(base); 44 45 cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); 46 47 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); 48 cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); 49 50 #ifdef __BIG_ENDIAN 51 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 52 cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 53 #else 54 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; 55 cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; 56 #endif 57 58 cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; 59 60 cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); 61 62 if (!node) { 63 dev_err(dev, "no device node, failed to add octeon sata\n"); 64 return -ENODEV; 65 } 66 67 ret = of_platform_populate(node, NULL, NULL, dev); 68 if (ret) { 69 dev_err(dev, "failed to add ahci-platform core\n"); 70 return ret; 71 } 72 73 return 0; 74 } 75 76 static int ahci_octeon_remove(struct platform_device *pdev) 77 { 78 return 0; 79 } 80 81 static const struct of_device_id octeon_ahci_match[] = { 82 { .compatible = "cavium,octeon-7130-sata-uctl", }, 83 {}, 84 }; 85 MODULE_DEVICE_TABLE(of, octeon_ahci_match); 86 87 static struct platform_driver ahci_octeon_driver = { 88 .probe = ahci_octeon_probe, 89 .remove = ahci_octeon_remove, 90 .driver = { 91 .name = "octeon-ahci", 92 .of_match_table = octeon_ahci_match, 93 }, 94 }; 95 96 module_platform_driver(ahci_octeon_driver); 97 98 MODULE_LICENSE("GPL"); 99 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>"); 100 MODULE_DESCRIPTION("Cavium Inc. sata config."); 101