tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller
Add the new ahci_da850 host driver.
Platform changes needed to make DaVinci DA850 SATA AHCI support
fully functional are in the separate "ARM: davinci: da850: update
SATA AHCI support" commit.
Please note that this driver doesn't have the superfluous clock
control code as clock is already handled by the generic AHCI
platform library code.
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
authored by
Bartlomiej Zolnierkiewicz
and committed by
Tejun Heo
ae8723f8
fd990556
+124
+9
drivers/ata/Kconfig
+9
drivers/ata/Kconfig
···
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If unsure, say N.
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config AHCI_DA850
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tristate "DaVinci DA850 AHCI SATA support"
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depends on ARCH_DAVINCI_DA850
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help
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This option enables support for the DaVinci DA850 SoC's
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onboard AHCI SATA.
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If unsure, say N.
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config AHCI_ST
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tristate "ST AHCI SATA support"
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depends on ARCH_STI
+1
drivers/ata/Makefile
+1
drivers/ata/Makefile
···
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obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
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obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
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obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
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obj-$(CONFIG_AHCI_DA850) += ahci_da850.o libahci.o libahci_platform.o
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obj-$(CONFIG_AHCI_IMX) += ahci_imx.o libahci.o libahci_platform.o
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obj-$(CONFIG_AHCI_SUNXI) += ahci_sunxi.o libahci.o libahci_platform.o
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obj-$(CONFIG_AHCI_ST) += ahci_st.o libahci.o libahci_platform.o
+114
drivers/ata/ahci_da850.c
+114
drivers/ata/ahci_da850.c
···
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+
/*
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* DaVinci DA850 AHCI SATA platform driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/libata.h>
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#include <linux/ahci_platform.h>
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#include "ahci.h"
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+
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/* SATA PHY Control Register offset from AHCI base */
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#define SATA_P0PHYCR_REG 0x178
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+
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#define SATA_PHY_MPY(x) ((x) << 0)
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#define SATA_PHY_LOS(x) ((x) << 6)
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#define SATA_PHY_RXCDR(x) ((x) << 10)
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#define SATA_PHY_RXEQ(x) ((x) << 13)
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#define SATA_PHY_TXSWING(x) ((x) << 19)
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#define SATA_PHY_ENPLL(x) ((x) << 31)
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+
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/*
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* The multiplier needed for 1.5GHz PLL output.
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*
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* NOTE: This is currently hardcoded to be suitable for 100MHz crystal
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* frequency (which is used by DA850 EVM board) and may need to be changed
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* if you would like to use this driver on some other board.
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*/
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#define DA850_SATA_CLK_MULTIPLIER 7
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static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
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void __iomem *ahci_base)
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{
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unsigned int val;
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/* Enable SATA clock receiver */
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val = readl(pwrdn_reg);
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val &= ~BIT(0);
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writel(val, pwrdn_reg);
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val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
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SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
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SATA_PHY_ENPLL(1);
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writel(val, ahci_base + SATA_P0PHYCR_REG);
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}
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static const struct ata_port_info ahci_da850_port_info = {
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.flags = AHCI_FLAG_COMMON,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_platform_ops,
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};
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static int ahci_da850_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ahci_host_priv *hpriv;
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struct resource *res;
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void __iomem *pwrdn_reg;
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int rc;
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hpriv = ahci_platform_get_resources(pdev);
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if (IS_ERR(hpriv))
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return PTR_ERR(hpriv);
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rc = ahci_platform_enable_resources(hpriv);
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if (rc)
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return rc;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res)
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goto disable_resources;
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pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
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if (!pwrdn_reg)
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goto disable_resources;
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da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
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rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0);
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if (rc)
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goto disable_resources;
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return 0;
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disable_resources:
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ahci_platform_disable_resources(hpriv);
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return rc;
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}
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static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
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ahci_platform_resume);
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static struct platform_driver ahci_da850_driver = {
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.probe = ahci_da850_probe,
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.remove = ata_platform_remove_one,
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.driver = {
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.name = "ahci_da850",
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.owner = THIS_MODULE,
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.pm = &ahci_da850_pm_ops,
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},
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};
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module_platform_driver(ahci_da850_driver);
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MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
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MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
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MODULE_LICENSE("GPL");