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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_da850.c
Initial import
Diffstat (limited to 'drivers/ata/ahci_da850.c')
-rw-r--r--drivers/ata/ahci_da850.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/ata/ahci_da850.c b/drivers/ata/ahci_da850.c
new file mode 100644
index 000000000..267a3d3e7
--- /dev/null
+++ b/drivers/ata/ahci_da850.c
@@ -0,0 +1,120 @@
+/*
+ * DaVinci DA850 AHCI SATA platform driver
+ *
+ * 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/device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+#include "ahci.h"
+
+#define DRV_NAME "ahci_da850"
+
+/* SATA PHY Control Register offset from AHCI base */
+#define SATA_P0PHYCR_REG 0x178
+
+#define SATA_PHY_MPY(x) ((x) << 0)
+#define SATA_PHY_LOS(x) ((x) << 6)
+#define SATA_PHY_RXCDR(x) ((x) << 10)
+#define SATA_PHY_RXEQ(x) ((x) << 13)
+#define SATA_PHY_TXSWING(x) ((x) << 19)
+#define SATA_PHY_ENPLL(x) ((x) << 31)
+
+/*
+ * The multiplier needed for 1.5GHz PLL output.
+ *
+ * NOTE: This is currently hardcoded to be suitable for 100MHz crystal
+ * frequency (which is used by DA850 EVM board) and may need to be changed
+ * if you would like to use this driver on some other board.
+ */
+#define DA850_SATA_CLK_MULTIPLIER 7
+
+static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
+ void __iomem *ahci_base)
+{
+ unsigned int val;
+
+ /* Enable SATA clock receiver */
+ val = readl(pwrdn_reg);
+ val &= ~BIT(0);
+ writel(val, pwrdn_reg);
+
+ val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
+ SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
+ SATA_PHY_ENPLL(1);
+
+ writel(val, ahci_base + SATA_P0PHYCR_REG);
+}
+
+static const struct ata_port_info ahci_da850_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_da850_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ahci_host_priv *hpriv;
+ struct resource *res;
+ void __iomem *pwrdn_reg;
+ 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;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ goto disable_resources;
+
+ pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
+ if (!pwrdn_reg)
+ goto disable_resources;
+
+ da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
+
+ rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
+ &ahci_platform_sht);
+ if (rc)
+ goto disable_resources;
+
+ return 0;
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+ return rc;
+}
+
+static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
+ ahci_platform_resume);
+
+static struct platform_driver ahci_da850_driver = {
+ .probe = ahci_da850_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ .pm = &ahci_da850_pm_ops,
+ },
+};
+module_platform_driver(ahci_da850_driver);
+
+MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
+MODULE_LICENSE("GPL");