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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/ata/ahci_mvebu.c
Initial import
Diffstat (limited to 'drivers/ata/ahci_mvebu.c')
-rw-r--r--drivers/ata/ahci_mvebu.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/ata/ahci_mvebu.c b/drivers/ata/ahci_mvebu.c
new file mode 100644
index 000000000..5928d0746
--- /dev/null
+++ b/drivers/ata/ahci_mvebu.c
@@ -0,0 +1,133 @@
+/*
+ * AHCI glue platform driver for Marvell EBU SOCs
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ * Marcin Wojtas <mw@semihalf.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/ahci_platform.h>
+#include <linux/kernel.h>
+#include <linux/mbus.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "ahci.h"
+
+#define DRV_NAME "ahci-mvebu"
+
+#define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0
+#define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4
+
+#define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4))
+#define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4))
+#define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4))
+
+static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
+ const struct mbus_dram_target_info *dram)
+{
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
+ writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
+ writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
+ }
+
+ for (i = 0; i < dram->num_cs; i++) {
+ const struct mbus_dram_window *cs = dram->cs + i;
+
+ writel((cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ hpriv->mmio + AHCI_WINDOW_CTRL(i));
+ writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
+ writel(((cs->size - 1) & 0xffff0000),
+ hpriv->mmio + AHCI_WINDOW_SIZE(i));
+ }
+}
+
+static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
+{
+ /*
+ * Enable the regret bit to allow the SATA unit to regret a
+ * request that didn't receive an acknowlegde and avoid a
+ * deadlock
+ */
+ writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
+ writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
+}
+
+static const struct ata_port_info ahci_mvebu_port_info = {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_platform_ops,
+};
+
+static struct scsi_host_template ahci_platform_sht = {
+ AHCI_SHT(DRV_NAME),
+};
+
+static int ahci_mvebu_probe(struct platform_device *pdev)
+{
+ struct ahci_host_priv *hpriv;
+ const struct mbus_dram_target_info *dram;
+ int rc;
+
+ hpriv = ahci_platform_get_resources(pdev);
+ if (IS_ERR(hpriv))
+ return PTR_ERR(hpriv);
+
+ rc = ahci_platform_enable_resources(hpriv);
+ if (rc)
+ return rc;
+
+ dram = mv_mbus_dram_info();
+ if (!dram)
+ return -ENODEV;
+
+ ahci_mvebu_mbus_config(hpriv, dram);
+ ahci_mvebu_regret_option(hpriv);
+
+ rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
+ &ahci_platform_sht);
+ if (rc)
+ goto disable_resources;
+
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+ return rc;
+}
+
+static const struct of_device_id ahci_mvebu_of_match[] = {
+ { .compatible = "marvell,armada-380-ahci", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
+
+/*
+ * We currently don't provide power management related operations,
+ * since there is no suspend/resume support at the platform level for
+ * Armada 38x for the moment.
+ */
+static struct platform_driver ahci_mvebu_driver = {
+ .probe = ahci_mvebu_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = ahci_mvebu_of_match,
+ },
+};
+module_platform_driver(ahci_mvebu_driver);
+
+MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
+MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ahci_mvebu");