--- /dev/null
+/*
+ * Freescale QorIQ AHCI SATA platform driver
+ *
+ * Copyright 2015 Freescale, Inc.
+ * Tang Yuantian <Yuantian.Tang@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/ahci_platform.h>
+#include <linux/device.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include "ahci.h"
+
+#define DRV_NAME "ahci-qoriq"
+
+/* port register definition */
+#define PORT_PHY1 0xA8
+#define PORT_PHY2 0xAC
+#define PORT_PHY3 0xB0
+#define PORT_PHY4 0xB4
+#define PORT_PHY5 0xB8
+#define PORT_TRANS 0xC8
+
+/* port register default value */
+#define AHCI_PORT_PHY_1_CFG 0xa003fffe
+#define AHCI_PORT_PHY_2_CFG 0x28183411
+#define AHCI_PORT_PHY_3_CFG 0x0e081004
+#define AHCI_PORT_PHY_4_CFG 0x00480811
+#define AHCI_PORT_PHY_5_CFG 0x192c96a4
+#define AHCI_PORT_TRANS_CFG 0x08000025
+
+#define SATA_ECC_DISABLE 0x00020000
+
+enum ahci_qoriq_type {
+ AHCI_LS1021A,
+ AHCI_LS1043A,
+ AHCI_LS2080A,
+};
+
+struct ahci_qoriq_priv {
+ struct ccsr_ahci *reg_base;
+ enum ahci_qoriq_type type;
+ void __iomem *ecc_addr;
+};
+
+static const struct of_device_id ahci_qoriq_of_match[] = {
+ { .compatible = "fsl,ls1021a-ahci", .data = (void *)AHCI_LS1021A},
+ { .compatible = "fsl,ls1043a-ahci", .data = (void *)AHCI_LS1043A},
+ { .compatible = "fsl,ls2080a-ahci", .data = (void *)AHCI_LS2080A},
+ {},
+};
+MODULE_DEVICE_TABLE(of, ahci_qoriq_of_match);
+
+static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
+ void __iomem *port_mmio = ahci_port_base(link->ap);
+ u32 px_cmd, px_is, px_val;
+ struct ata_port *ap = link->ap;
+ struct ahci_port_priv *pp = ap->private_data;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct ahci_qoriq_priv *qoriq_priv = hpriv->plat_data;
+ u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+ struct ata_taskfile tf;
+ bool online;
+ int rc;
+ bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);
+
+ DPRINTK("ENTER\n");
+
+ ahci_stop_engine(ap);
+
+ /*
+ * There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
+ * A-009042: The device detection initialization sequence
+ * mistakenly resets some registers.
+ *
+ * Workaround for this is:
+ * The software should read and store PxCMD and PxIS values
+ * before issuing the device detection initialization sequence.
+ * After the sequence is complete, software should restore the
+ * PxCMD and PxIS with the stored values.
+ */
+ if (ls1021a_workaround) {
+ px_cmd = readl(port_mmio + PORT_CMD);
+ px_is = readl(port_mmio + PORT_IRQ_STAT);
+ }
+
+ /* clear D2H reception area to properly wait for D2H FIS */
+ ata_tf_init(link->device, &tf);
+ tf.command = ATA_BUSY;
+ ata_tf_to_fis(&tf, 0, 0, d2h_fis);
+
+ rc = sata_link_hardreset(link, timing, deadline, &online,
+ ahci_check_ready);
+
+ /* restore the PxCMD and PxIS on ls1021 */
+ if (ls1021a_workaround) {
+ px_val = readl(port_mmio + PORT_CMD);
+ if (px_val != px_cmd)
+ writel(px_cmd, port_mmio + PORT_CMD);
+
+ px_val = readl(port_mmio + PORT_IRQ_STAT);
+ if (px_val != px_is)
+ writel(px_is, port_mmio + PORT_IRQ_STAT);
+ }
+
+ hpriv->start_engine(ap);
+
+ if (online)
+ *class = ahci_dev_classify(ap);
+
+ DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
+ return rc;
+}
+
+static struct ata_port_operations ahci_qoriq_ops = {
+ .inherits = &ahci_ops,
+ .hardreset = ahci_qoriq_hardreset,
+};
+
+static struct ata_port_info ahci_qoriq_port_info = {
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_qoriq_ops,
+};
+
+static struct scsi_host_template ahci_qoriq_sht = {
+ AHCI_SHT(DRV_NAME),
+};
+
+static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
+{
+ struct ahci_qoriq_priv *qpriv = hpriv->plat_data;
+ void __iomem *reg_base = hpriv->mmio;
+
+ switch (qpriv->type) {
+ case AHCI_LS1021A:
+ writel(SATA_ECC_DISABLE, qpriv->ecc_addr);
+ writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
+ writel(AHCI_PORT_PHY_2_CFG, reg_base + PORT_PHY2);
+ writel(AHCI_PORT_PHY_3_CFG, reg_base + PORT_PHY3);
+ writel(AHCI_PORT_PHY_4_CFG, reg_base + PORT_PHY4);
+ writel(AHCI_PORT_PHY_5_CFG, reg_base + PORT_PHY5);
+ writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
+ break;
+
+ case AHCI_LS1043A:
+ case AHCI_LS2080A:
+ writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
+ break;
+ }
+
+ return 0;
+}
+
+static int ahci_qoriq_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct ahci_host_priv *hpriv;
+ struct ahci_qoriq_priv *qoriq_priv;
+ const struct of_device_id *of_id;
+ struct resource *res;
+ int rc;
+
+ hpriv = ahci_platform_get_resources(pdev);
+ if (IS_ERR(hpriv))
+ return PTR_ERR(hpriv);
+
+ of_id = of_match_node(ahci_qoriq_of_match, np);
+ if (!of_id)
+ return -ENODEV;
+
+ qoriq_priv = devm_kzalloc(dev, sizeof(*qoriq_priv), GFP_KERNEL);
+ if (!qoriq_priv)
+ return -ENOMEM;
+
+ qoriq_priv->type = (enum ahci_qoriq_type)of_id->data;
+
+ if (qoriq_priv->type == AHCI_LS1021A) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "sata-ecc");
+ qoriq_priv->ecc_addr = devm_ioremap_resource(dev, res);
+ if (IS_ERR(qoriq_priv->ecc_addr))
+ return PTR_ERR(qoriq_priv->ecc_addr);
+ }
+
+ rc = ahci_platform_enable_resources(hpriv);
+ if (rc)
+ return rc;
+
+ hpriv->plat_data = qoriq_priv;
+ rc = ahci_qoriq_phy_init(hpriv);
+ if (rc)
+ goto disable_resources;
+
+ /* Workaround for ls2080a */
+ if (qoriq_priv->type == AHCI_LS2080A) {
+ hpriv->flags |= AHCI_HFLAG_NO_NCQ;
+ ahci_qoriq_port_info.flags &= ~ATA_FLAG_NCQ;
+ }
+
+ rc = ahci_platform_init_host(pdev, hpriv, &ahci_qoriq_port_info,
+ &ahci_qoriq_sht);
+ if (rc)
+ goto disable_resources;
+
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+
+ return rc;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ahci_qoriq_resume(struct device *dev)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
+ int rc;
+
+ rc = ahci_platform_enable_resources(hpriv);
+ if (rc)
+ return rc;
+
+ rc = ahci_qoriq_phy_init(hpriv);
+ if (rc)
+ goto disable_resources;
+
+ rc = ahci_platform_resume_host(dev);
+ if (rc)
+ goto disable_resources;
+
+ /* We resumed so update PM runtime state */
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+
+ return rc;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(ahci_qoriq_pm_ops, ahci_platform_suspend,
+ ahci_qoriq_resume);
+
+static struct platform_driver ahci_qoriq_driver = {
+ .probe = ahci_qoriq_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = ahci_qoriq_of_match,
+ .pm = &ahci_qoriq_pm_ops,
+ },
+};
+module_platform_driver(ahci_qoriq_driver);
+
+MODULE_DESCRIPTION("Freescale QorIQ AHCI SATA platform driver");
+MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff