mirror of https://gitee.com/openkylin/linux.git
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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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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#define DRV_NAME "ahci_da850"
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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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#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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* 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 struct scsi_host_template ahci_platform_sht = {
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AHCI_SHT(DRV_NAME),
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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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struct clk *clk;
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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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/*
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* Internally ahci_platform_get_resources() calls clk_get(dev, NULL)
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* when trying to obtain the functional clock. This SATA controller
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* uses two clocks for which we specify two connection ids. If we don't
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* have the functional clock at this point - call clk_get() again with
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* con_id = "fck".
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*/
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if (!hpriv->clks[0]) {
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clk = clk_get(dev, "fck");
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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hpriv->clks[0] = clk;
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}
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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,
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&ahci_platform_sht);
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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 const struct of_device_id ahci_da850_of_match[] = {
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{ .compatible = "ti,da850-ahci", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ahci_da850_of_match);
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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 = DRV_NAME,
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.of_match_table = ahci_da850_of_match,
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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");
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