diff options
Diffstat (limited to 'kernel/drivers/ata/ahci_st.c')
| -rw-r--r-- | kernel/drivers/ata/ahci_st.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/kernel/drivers/ata/ahci_st.c b/kernel/drivers/ata/ahci_st.c new file mode 100644 index 000000000..8ff428fe8 --- /dev/null +++ b/kernel/drivers/ata/ahci_st.c @@ -0,0 +1,252 @@ +/* + * Copyright (C) 2012 STMicroelectronics Limited + * + * Authors: Francesco Virlinzi <francesco.virlinzi@st.com> + * Alexandre Torgue <alexandre.torgue@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/export.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/ahci_platform.h> +#include <linux/libata.h> +#include <linux/reset.h> +#include <linux/io.h> +#include <linux/dma-mapping.h> + +#include "ahci.h" + +#define DRV_NAME "st_ahci" + +#define ST_AHCI_OOBR 0xbc +#define ST_AHCI_OOBR_WE BIT(31) +#define ST_AHCI_OOBR_CWMIN_SHIFT 24 +#define ST_AHCI_OOBR_CWMAX_SHIFT 16 +#define ST_AHCI_OOBR_CIMIN_SHIFT 8 +#define ST_AHCI_OOBR_CIMAX_SHIFT 0 + +struct st_ahci_drv_data { + struct platform_device *ahci; + struct reset_control *pwr; + struct reset_control *sw_rst; + struct reset_control *pwr_rst; +}; + +static void st_ahci_configure_oob(void __iomem *mmio) +{ + unsigned long old_val, new_val; + + new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | + (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | + (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | + (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); + + old_val = readl(mmio + ST_AHCI_OOBR); + writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); + writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); + writel(new_val, mmio + ST_AHCI_OOBR); +} + +static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv, + struct device *dev) +{ + struct st_ahci_drv_data *drv_data = hpriv->plat_data; + int err; + + if (drv_data->pwr) { + err = reset_control_deassert(drv_data->pwr); + if (err) { + dev_err(dev, "unable to bring out of pwrdwn\n"); + return err; + } + } + + if (drv_data->sw_rst) { + err = reset_control_deassert(drv_data->sw_rst); + if (err) { + dev_err(dev, "unable to bring out of sw-rst\n"); + return err; + } + } + + if (drv_data->pwr_rst) { + err = reset_control_deassert(drv_data->pwr_rst); + if (err) { + dev_err(dev, "unable to bring out of pwr-rst\n"); + return err; + } + } + + return 0; +} + +static void st_ahci_host_stop(struct ata_host *host) +{ + struct ahci_host_priv *hpriv = host->private_data; + struct st_ahci_drv_data *drv_data = hpriv->plat_data; + struct device *dev = host->dev; + int err; + + if (drv_data->pwr) { + err = reset_control_assert(drv_data->pwr); + if (err) + dev_err(dev, "unable to pwrdwn\n"); + } + + ahci_platform_disable_resources(hpriv); +} + +static int st_ahci_probe_resets(struct ahci_host_priv *hpriv, + struct device *dev) +{ + struct st_ahci_drv_data *drv_data = hpriv->plat_data; + + drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn"); + if (IS_ERR(drv_data->pwr)) { + dev_info(dev, "power reset control not defined\n"); + drv_data->pwr = NULL; + } + + drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst"); + if (IS_ERR(drv_data->sw_rst)) { + dev_info(dev, "soft reset control not defined\n"); + drv_data->sw_rst = NULL; + } + + drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst"); + if (IS_ERR(drv_data->pwr_rst)) { + dev_dbg(dev, "power soft reset control not defined\n"); + drv_data->pwr_rst = NULL; + } + + return st_ahci_deassert_resets(hpriv, dev); +} + +static struct ata_port_operations st_ahci_port_ops = { + .inherits = &ahci_platform_ops, + .host_stop = st_ahci_host_stop, +}; + +static const struct ata_port_info st_ahci_port_info = { + .flags = AHCI_FLAG_COMMON, + .pio_mask = ATA_PIO4, + .udma_mask = ATA_UDMA6, + .port_ops = &st_ahci_port_ops, +}; + +static struct scsi_host_template ahci_platform_sht = { + AHCI_SHT(DRV_NAME), +}; + +static int st_ahci_probe(struct platform_device *pdev) +{ + struct st_ahci_drv_data *drv_data; + struct ahci_host_priv *hpriv; + int err; + + drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); + if (!drv_data) + return -ENOMEM; + + hpriv = ahci_platform_get_resources(pdev); + if (IS_ERR(hpriv)) + return PTR_ERR(hpriv); + hpriv->plat_data = drv_data; + + err = st_ahci_probe_resets(hpriv, &pdev->dev); + if (err) + return err; + + err = ahci_platform_enable_resources(hpriv); + if (err) + return err; + + st_ahci_configure_oob(hpriv->mmio); + + err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, + &ahci_platform_sht); + if (err) { + ahci_platform_disable_resources(hpriv); + return err; + } + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int st_ahci_suspend(struct device *dev) +{ + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + struct st_ahci_drv_data *drv_data = hpriv->plat_data; + int err; + + err = ahci_platform_suspend_host(dev); + if (err) + return err; + + if (drv_data->pwr) { + err = reset_control_assert(drv_data->pwr); + if (err) { + dev_err(dev, "unable to pwrdwn"); + return err; + } + } + + ahci_platform_disable_resources(hpriv); + + return 0; +} + +static int st_ahci_resume(struct device *dev) +{ + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + int err; + + err = ahci_platform_enable_resources(hpriv); + if (err) + return err; + + err = st_ahci_deassert_resets(hpriv, dev); + if (err) { + ahci_platform_disable_resources(hpriv); + return err; + } + + st_ahci_configure_oob(hpriv->mmio); + + return ahci_platform_resume_host(dev); +} +#endif + +static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); + +static const struct of_device_id st_ahci_match[] = { + { .compatible = "st,ahci", }, + {}, +}; +MODULE_DEVICE_TABLE(of, st_ahci_match); + +static struct platform_driver st_ahci_driver = { + .driver = { + .name = DRV_NAME, + .pm = &st_ahci_pm_ops, + .of_match_table = of_match_ptr(st_ahci_match), + }, + .probe = st_ahci_probe, + .remove = ata_platform_remove_one, +}; +module_platform_driver(st_ahci_driver); + +MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); +MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver"); +MODULE_LICENSE("GPL v2"); |