diff options
Diffstat (limited to 'kernel/drivers/ata/ahci_ceva.c')
| -rw-r--r-- | kernel/drivers/ata/ahci_ceva.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/kernel/drivers/ata/ahci_ceva.c b/kernel/drivers/ata/ahci_ceva.c new file mode 100644 index 000000000..207649d32 --- /dev/null +++ b/kernel/drivers/ata/ahci_ceva.c @@ -0,0 +1,238 @@ +/* + * Copyright (C) 2015 Xilinx, Inc. + * CEVA AHCI SATA platform driver + * + * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/ahci_platform.h> +#include <linux/kernel.h> +#include <linux/libata.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include "ahci.h" + +/* Vendor Specific Register Offsets */ +#define AHCI_VEND_PCFG 0xA4 +#define AHCI_VEND_PPCFG 0xA8 +#define AHCI_VEND_PP2C 0xAC +#define AHCI_VEND_PP3C 0xB0 +#define AHCI_VEND_PP4C 0xB4 +#define AHCI_VEND_PP5C 0xB8 +#define AHCI_VEND_PAXIC 0xC0 +#define AHCI_VEND_PTC 0xC8 + +/* Vendor Specific Register bit definitions */ +#define PAXIC_ADBW_BW64 0x1 +#define PAXIC_MAWIDD (1 << 8) +#define PAXIC_MARIDD (1 << 16) +#define PAXIC_OTL (0x4 << 20) + +#define PCFG_TPSS_VAL (0x32 << 16) +#define PCFG_TPRS_VAL (0x2 << 12) +#define PCFG_PAD_VAL 0x2 + +#define PPCFG_TTA 0x1FFFE +#define PPCFG_PSSO_EN (1 << 28) +#define PPCFG_PSS_EN (1 << 29) +#define PPCFG_ESDF_EN (1 << 31) + +#define PP2C_CIBGMN 0x0F +#define PP2C_CIBGMX (0x25 << 8) +#define PP2C_CIBGN (0x18 << 16) +#define PP2C_CINMP (0x29 << 24) + +#define PP3C_CWBGMN 0x04 +#define PP3C_CWBGMX (0x0B << 8) +#define PP3C_CWBGN (0x08 << 16) +#define PP3C_CWNMP (0x0F << 24) + +#define PP4C_BMX 0x0a +#define PP4C_BNM (0x08 << 8) +#define PP4C_SFD (0x4a << 16) +#define PP4C_PTST (0x06 << 24) + +#define PP5C_RIT 0x60216 +#define PP5C_RCT (0x7f0 << 20) + +#define PTC_RX_WM_VAL 0x40 +#define PTC_RSVD (1 << 27) + +#define PORT0_BASE 0x100 +#define PORT1_BASE 0x180 + +/* Port Control Register Bit Definitions */ +#define PORT_SCTL_SPD_GEN2 (0x2 << 4) +#define PORT_SCTL_SPD_GEN1 (0x1 << 4) +#define PORT_SCTL_IPM (0x3 << 8) + +#define PORT_BASE 0x100 +#define PORT_OFFSET 0x80 +#define NR_PORTS 2 +#define DRV_NAME "ahci-ceva" +#define CEVA_FLAG_BROKEN_GEN2 1 + +struct ceva_ahci_priv { + struct platform_device *ahci_pdev; + int flags; +}; + +static struct ata_port_operations ahci_ceva_ops = { + .inherits = &ahci_platform_ops, +}; + +static const struct ata_port_info ahci_ceva_port_info = { + .flags = AHCI_FLAG_COMMON, + .pio_mask = ATA_PIO4, + .udma_mask = ATA_UDMA6, + .port_ops = &ahci_ceva_ops, +}; + +static void ahci_ceva_setup(struct ahci_host_priv *hpriv) +{ + void __iomem *mmio = hpriv->mmio; + struct ceva_ahci_priv *cevapriv = hpriv->plat_data; + u32 tmp; + int i; + + /* + * AXI Data bus width to 64 + * Set Mem Addr Read, Write ID for data transfers + * Transfer limit to 72 DWord + */ + tmp = PAXIC_ADBW_BW64 | PAXIC_MAWIDD | PAXIC_MARIDD | PAXIC_OTL; + writel(tmp, mmio + AHCI_VEND_PAXIC); + + /* Set AHCI Enable */ + tmp = readl(mmio + HOST_CTL); + tmp |= HOST_AHCI_EN; + writel(tmp, mmio + HOST_CTL); + + for (i = 0; i < NR_PORTS; i++) { + /* TPSS TPRS scalars, CISE and Port Addr */ + tmp = PCFG_TPSS_VAL | PCFG_TPRS_VAL | (PCFG_PAD_VAL + i); + writel(tmp, mmio + AHCI_VEND_PCFG); + + /* Port Phy Cfg register enables */ + tmp = PPCFG_TTA | PPCFG_PSS_EN | PPCFG_ESDF_EN; + writel(tmp, mmio + AHCI_VEND_PPCFG); + + /* Phy Control OOB timing parameters COMINIT */ + tmp = PP2C_CIBGMN | PP2C_CIBGMX | PP2C_CIBGN | PP2C_CINMP; + writel(tmp, mmio + AHCI_VEND_PP2C); + + /* Phy Control OOB timing parameters COMWAKE */ + tmp = PP3C_CWBGMN | PP3C_CWBGMX | PP3C_CWBGN | PP3C_CWNMP; + writel(tmp, mmio + AHCI_VEND_PP3C); + + /* Phy Control Burst timing setting */ + tmp = PP4C_BMX | PP4C_BNM | PP4C_SFD | PP4C_PTST; + writel(tmp, mmio + AHCI_VEND_PP4C); + + /* Rate Change Timer and Retry Interval Timer setting */ + tmp = PP5C_RIT | PP5C_RCT; + writel(tmp, mmio + AHCI_VEND_PP5C); + + /* Rx Watermark setting */ + tmp = PTC_RX_WM_VAL | PTC_RSVD; + writel(tmp, mmio + AHCI_VEND_PTC); + + /* Default to Gen 2 Speed and Gen 1 if Gen2 is broken */ + tmp = PORT_SCTL_SPD_GEN2 | PORT_SCTL_IPM; + if (cevapriv->flags & CEVA_FLAG_BROKEN_GEN2) + tmp = PORT_SCTL_SPD_GEN1 | PORT_SCTL_IPM; + writel(tmp, mmio + PORT_SCR_CTL + PORT_BASE + PORT_OFFSET * i); + } +} + +static struct scsi_host_template ahci_platform_sht = { + AHCI_SHT(DRV_NAME), +}; + +static int ceva_ahci_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + struct ahci_host_priv *hpriv; + struct ceva_ahci_priv *cevapriv; + int rc; + + cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL); + if (!cevapriv) + return -ENOMEM; + + cevapriv->ahci_pdev = pdev; + + hpriv = ahci_platform_get_resources(pdev); + if (IS_ERR(hpriv)) + return PTR_ERR(hpriv); + + rc = ahci_platform_enable_resources(hpriv); + if (rc) + return rc; + + if (of_property_read_bool(np, "ceva,broken-gen2")) + cevapriv->flags = CEVA_FLAG_BROKEN_GEN2; + + hpriv->plat_data = cevapriv; + + /* CEVA specific initialization */ + ahci_ceva_setup(hpriv); + + rc = ahci_platform_init_host(pdev, hpriv, &ahci_ceva_port_info, + &ahci_platform_sht); + if (rc) + goto disable_resources; + + return 0; + +disable_resources: + ahci_platform_disable_resources(hpriv); + return rc; +} + +static int __maybe_unused ceva_ahci_suspend(struct device *dev) +{ + return ahci_platform_suspend_host(dev); +} + +static int __maybe_unused ceva_ahci_resume(struct device *dev) +{ + return ahci_platform_resume_host(dev); +} + +static SIMPLE_DEV_PM_OPS(ahci_ceva_pm_ops, ceva_ahci_suspend, ceva_ahci_resume); + +static const struct of_device_id ceva_ahci_of_match[] = { + { .compatible = "ceva,ahci-1v84" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ceva_ahci_of_match); + +static struct platform_driver ceva_ahci_driver = { + .probe = ceva_ahci_probe, + .remove = ata_platform_remove_one, + .driver = { + .name = DRV_NAME, + .of_match_table = ceva_ahci_of_match, + .pm = &ahci_ceva_pm_ops, + }, +}; +module_platform_driver(ceva_ahci_driver); + +MODULE_DESCRIPTION("CEVA AHCI SATA platform driver"); +MODULE_AUTHOR("Xilinx Inc."); +MODULE_LICENSE("GPL v2"); |