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ahci: st: Add support for ST's SATA IP
Acked-by: Alexandre Torgue <alexandre.torgue@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lee Jones
Tejun Heo
parent
e853a4e01f
commit
76884cb2f7
@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM
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If unsure, say N.
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config SATA_AHCI_ST
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tristate "ST SATA support"
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depends on SATA_AHCI_PLATFORM
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select GENERIC_PHY
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help
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This option enables support for ST SATA controller.
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If unsure, say N.
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config AHCI_IMX
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tristate "Freescale i.MX AHCI SATA support"
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depends on SATA_AHCI_PLATFORM && MFD_SYSCON
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@ -5,6 +5,7 @@ obj-$(CONFIG_ATA) += libata.o
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obj-$(CONFIG_SATA_AHCI) += ahci.o libahci.o
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obj-$(CONFIG_SATA_ACARD_AHCI) += acard-ahci.o libahci.o
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obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o
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obj-$(CONFIG_SATA_AHCI_ST) += ahci_st.o
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obj-$(CONFIG_SATA_FSL) += sata_fsl.o
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obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
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obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
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239
drivers/ata/ahci_st.c
Normal file
239
drivers/ata/ahci_st.c
Normal file
@ -0,0 +1,239 @@
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/*
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* Copyright (C) 2012 STMicroelectronics Limited
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*
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* Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
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* Alexandre Torgue <alexandre.torgue@st.com>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/ahci_platform.h>
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#include <linux/phy/phy.h>
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#include <linux/libata.h>
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#include <linux/reset.h>
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#include <linux/io.h>
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#include <linux/dma-mapping.h>
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#include "ahci.h"
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#define ST_AHCI_OOBR 0xbc
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#define ST_AHCI_OOBR_WE BIT(31)
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#define ST_AHCI_OOBR_CWMIN_SHIFT 24
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#define ST_AHCI_OOBR_CWMAX_SHIFT 16
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#define ST_AHCI_OOBR_CIMIN_SHIFT 8
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#define ST_AHCI_OOBR_CIMAX_SHIFT 0
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struct st_ahci_drv_data {
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struct platform_device *ahci;
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struct phy *phy;
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struct reset_control *pwr;
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struct reset_control *sw_rst;
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struct reset_control *pwr_rst;
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struct ahci_host_priv *hpriv;
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};
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static void st_ahci_configure_oob(void __iomem *mmio)
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{
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unsigned long old_val, new_val;
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new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
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(0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
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(0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
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(0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
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old_val = readl(mmio + ST_AHCI_OOBR);
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writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
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writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
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writel(new_val, mmio + ST_AHCI_OOBR);
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}
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static int st_ahci_deassert_resets(struct device *dev)
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{
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struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
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int err;
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if (drv_data->pwr) {
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err = reset_control_deassert(drv_data->pwr);
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if (err) {
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dev_err(dev, "unable to bring out of pwrdwn\n");
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return err;
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}
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}
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st_ahci_configure_oob(drv_data->hpriv->mmio);
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if (drv_data->sw_rst) {
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err = reset_control_deassert(drv_data->sw_rst);
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if (err) {
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dev_err(dev, "unable to bring out of sw-rst\n");
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return err;
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}
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}
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if (drv_data->pwr_rst) {
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err = reset_control_deassert(drv_data->pwr_rst);
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if (err) {
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dev_err(dev, "unable to bring out of pwr-rst\n");
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return err;
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}
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}
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return 0;
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}
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static int st_ahci_probe_resets(struct platform_device *pdev)
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{
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struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
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drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
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if (IS_ERR(drv_data->pwr)) {
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dev_info(&pdev->dev, "power reset control not defined\n");
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drv_data->pwr = NULL;
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}
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drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
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if (IS_ERR(drv_data->sw_rst)) {
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dev_info(&pdev->dev, "soft reset control not defined\n");
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drv_data->sw_rst = NULL;
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}
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drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
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if (IS_ERR(drv_data->pwr_rst)) {
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dev_dbg(&pdev->dev, "power soft reset control not defined\n");
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drv_data->pwr_rst = NULL;
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}
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return st_ahci_deassert_resets(&pdev->dev);
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}
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static const struct ata_port_info st_ahci_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 st_ahci_probe(struct platform_device *pdev)
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{
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struct st_ahci_drv_data *drv_data;
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struct ahci_host_priv *hpriv;
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int err;
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drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
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if (!drv_data)
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return -ENOMEM;
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platform_set_drvdata(pdev, drv_data);
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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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drv_data->hpriv = hpriv;
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err = st_ahci_probe_resets(pdev);
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if (err)
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return err;
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err = ahci_platform_enable_resources(hpriv);
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if (err)
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return err;
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err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 0, 0);
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if (err) {
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ahci_platform_disable_resources(hpriv);
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return err;
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}
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return 0;
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}
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static int st_ahci_remove(struct platform_device *pdev)
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{
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struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
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struct ahci_host_priv *hpriv = drv_data->hpriv;
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int err;
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if (drv_data->pwr) {
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err = reset_control_assert(drv_data->pwr);
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if (err)
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dev_err(&pdev->dev, "unable to pwrdwn\n");
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}
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ahci_platform_disable_resources(hpriv);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int st_ahci_suspend(struct device *dev)
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{
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struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
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struct ahci_host_priv *hpriv = drv_data->hpriv;
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int err;
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if (drv_data->pwr) {
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err = reset_control_assert(drv_data->pwr);
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if (err) {
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dev_err(dev, "unable to pwrdwn");
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return err;
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}
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}
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ahci_platform_disable_resources(hpriv);
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return 0;
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}
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static int st_ahci_resume(struct device *dev)
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{
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struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
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struct ahci_host_priv *hpriv = drv_data->hpriv;
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int err;
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err = ahci_platform_enable_resources(hpriv);
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if (err)
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return err;
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err = st_ahci_deassert_resets(dev);
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if (err) {
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ahci_platform_disable_resources(hpriv);
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return err;
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}
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
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static struct of_device_id st_ahci_match[] = {
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{ .compatible = "st,ahci", },
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{},
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};
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MODULE_DEVICE_TABLE(of, st_ahci_match);
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static struct platform_driver st_ahci_driver = {
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.driver = {
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.name = "st_ahci",
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.owner = THIS_MODULE,
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.pm = &st_ahci_pm_ops,
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.of_match_table = of_match_ptr(st_ahci_match),
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},
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.probe = st_ahci_probe,
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.remove = st_ahci_remove,
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};
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module_platform_driver(st_ahci_driver);
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MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
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MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics Sata Ahci driver");
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MODULE_LICENSE("GPL v2");
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