diff options
author | Aleksey Makarov <aleksey.makarov@caviumnetworks.com> | 2016-02-11 13:53:08 (GMT) |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2016-02-11 15:12:04 (GMT) |
commit | a2127e400edd2258fda6d83fe8b10b878a3595d9 (patch) | |
tree | 47e1dc70456a5d7231295825a152d98e060d3d81 /drivers/ata/ahci_octeon.c | |
parent | 287e6611ab1eac76c2c5ebf6e345e04c80ca9c61 (diff) | |
download | linux-a2127e400edd2258fda6d83fe8b10b878a3595d9.tar.xz |
libata: support AHCI on OCTEON platform
The OCTEON SATA controller is currently found on cn71XX devices.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Vinita Gupta <vgupta@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci_octeon.c')
-rw-r--r-- | drivers/ata/ahci_octeon.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/ata/ahci_octeon.c b/drivers/ata/ahci_octeon.c new file mode 100644 index 0000000..ea865fe --- /dev/null +++ b/drivers/ata/ahci_octeon.c @@ -0,0 +1,105 @@ +/* + * SATA glue for Cavium Octeon III SOCs. + * + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2010-2015 Cavium Networks + * + */ + +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/of_platform.h> + +#include <asm/octeon/octeon.h> +#include <asm/bitfield.h> + +#define CVMX_SATA_UCTL_SHIM_CFG 0xE8 + +#define SATA_UCTL_ENDIAN_MODE_BIG 1 +#define SATA_UCTL_ENDIAN_MODE_LITTLE 0 +#define SATA_UCTL_ENDIAN_MODE_MASK 3 + +#define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8 +#define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0 +#define SATA_UCTL_DMA_READ_CMD_SHIFT 12 + +static int ahci_octeon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct resource *res; + void __iomem *base; + u64 cfg; + int ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Platform resource[0] is missing\n"); + return -ENODEV; + } + + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); + + cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); + cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); + +#ifdef __BIG_ENDIAN + cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; + cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; +#else + cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; + cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; +#endif + + cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; + + cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); + + if (!node) { + dev_err(dev, "no device node, failed to add octeon sata\n"); + return -ENODEV; + } + + ret = of_platform_populate(node, NULL, NULL, dev); + if (ret) { + dev_err(dev, "failed to add ahci-platform core\n"); + return ret; + } + + return 0; +} + +static int ahci_octeon_remove(struct platform_device *pdev) +{ + return 0; +} + +static const struct of_device_id octeon_ahci_match[] = { + { .compatible = "cavium,octeon-7130-sata-uctl", }, + {}, +}; +MODULE_DEVICE_TABLE(of, octeon_ahci_match); + +static struct platform_driver ahci_octeon_driver = { + .probe = ahci_octeon_probe, + .remove = ahci_octeon_remove, + .driver = { + .name = "octeon-ahci", + .of_match_table = octeon_ahci_match, + }, +}; + +module_platform_driver(ahci_octeon_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>"); +MODULE_DESCRIPTION("Cavium Inc. sata config."); |