// SPDX-License-Identifier: GPL-2.0-only
/*
* Allwinner sunxi AHCI SATA platform driver
* Copyright 2013 Olliver Schinagl < oliver @ schinagl . nl >
* Copyright 2014 Hans de Goede < hdegoede @ redhat . com >
*
* based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
* Based on code from Allwinner Technology Co . , Ltd . < www . allwinnertech . com > ,
* Daniel Wang < danielwang @ allwinnertech . com >
*/
#include <linux/ahci_platform.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include "ahci.h"
#define DRV_NAME "ahci-sunxi"
/* Insmod parameters */
static bool enable_pmp;
module_param(enable_pmp, bool , 0 );
MODULE_PARM_DESC(enable_pmp,
"Enable support for sata port multipliers, only use if you use a pmp!" );
#define AHCI_BISTAFR 0 x00a0
#define AHCI_BISTCR 0 x00a4
#define AHCI_BISTFCTR 0 x00a8
#define AHCI_BISTSR 0 x00ac
#define AHCI_BISTDECR 0 x00b0
#define AHCI_DIAGNR0 0 x00b4
#define AHCI_DIAGNR1 0 x00b8
#define AHCI_OOBR 0 x00bc
#define AHCI_PHYCS0R 0 x00c0
#define AHCI_PHYCS1R 0 x00c4
#define AHCI_PHYCS2R 0 x00c8
#define AHCI_TIMER1MS 0 x00e0
#define AHCI_GPARAM1R 0 x00e8
#define AHCI_GPARAM2R 0 x00ec
#define AHCI_PPARAMR 0 x00f0
#define AHCI_TESTR 0 x00f4
#define AHCI_VERSIONR 0 x00f8
#define AHCI_IDR 0 x00fc
#define AHCI_RWCR 0 x00fc
#define AHCI_P0DMACR 0 x0170
#define AHCI_P0PHYCR 0 x0178
#define AHCI_P0PHYSR 0 x017c
static void sunxi_clrbits(void __iomem *reg, u32 clr_val)
{
u32 reg_val;
reg_val = readl(reg);
reg_val &= ~(clr_val);
writel(reg_val, reg);
}
static void sunxi_setbits(void __iomem *reg, u32 set_val)
{
u32 reg_val;
reg_val = readl(reg);
reg_val |= set_val;
writel(reg_val, reg);
}
static void sunxi_clrsetbits(void __iomem *reg, u32 clr_val, u32 set_val)
{
u32 reg_val;
reg_val = readl(reg);
reg_val &= ~(clr_val);
reg_val |= set_val;
writel(reg_val, reg);
}
static u32 sunxi_getbits(void __iomem *reg, u8 mask, u8 shift)
{
return (readl(reg) >> shift) & mask;
}
static int ahci_sunxi_phy_init(struct device *dev, void __iomem *reg_base)
{
u32 reg_val;
int timeout;
/* This magic is from the original code */
writel(0 , reg_base + AHCI_RWCR);
msleep(5 );
sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(19 ));
sunxi_clrsetbits(reg_base + AHCI_PHYCS0R,
(0 x7 << 24 ),
(0 x5 << 24 ) | BIT(23 ) | BIT(18 ));
sunxi_clrsetbits(reg_base + AHCI_PHYCS1R,
(0 x3 << 16 ) | (0 x1f << 8 ) | (0 x3 << 6 ),
(0 x2 << 16 ) | (0 x6 << 8 ) | (0 x2 << 6 ));
sunxi_setbits(reg_base + AHCI_PHYCS1R, BIT(28 ) | BIT(15 ));
sunxi_clrbits(reg_base + AHCI_PHYCS1R, BIT(19 ));
sunxi_clrsetbits(reg_base + AHCI_PHYCS0R,
(0 x7 << 20 ), (0 x3 << 20 ));
sunxi_clrsetbits(reg_base + AHCI_PHYCS2R,
(0 x1f << 5 ), (0 x19 << 5 ));
msleep(5 );
sunxi_setbits(reg_base + AHCI_PHYCS0R, (0 x1 << 19 ));
timeout = 250 ; /* Power up takes aprox 50 us */
do {
reg_val = sunxi_getbits(reg_base + AHCI_PHYCS0R, 0 x7, 28 );
if (reg_val == 0 x02)
break ;
if (--timeout == 0 ) {
dev_err(dev, "PHY power up failed.\n" );
return -EIO;
}
udelay(1 );
} while (1 );
sunxi_setbits(reg_base + AHCI_PHYCS2R, (0 x1 << 24 ));
timeout = 100 ; /* Calibration takes aprox 10 us */
do {
reg_val = sunxi_getbits(reg_base + AHCI_PHYCS2R, 0 x1, 24 );
if (reg_val == 0 x00)
break ;
if (--timeout == 0 ) {
dev_err(dev, "PHY calibration failed.\n" );
return -EIO;
}
udelay(1 );
} while (1 );
msleep(15 );
writel(0 x7, reg_base + AHCI_RWCR);
return 0 ;
}
static void ahci_sunxi_start_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_host_priv *hpriv = ap->host->private_data;
/* Setup DMA before DMA start
*
* NOTE : A similar SoC with SATA / AHCI by Texas Instruments documents
* this Vendor Specific Port ( P0DMACR , aka PxDMACR ) in its
* User ' s Guide document ( TMS320C674x / OMAP - L1x Processor
* Serial ATA ( SATA ) Controller , Literature Number : SPRUGJ8C ,
* March 2011 , Chapter 4 . 33 Port DMA Control Register ( P0DMACR ) ,
* p . 68 , https : //www.ti.com/lit/ug/sprugj8c/sprugj8c.pdf)
* as equivalent to the following struct :
*
* struct AHCI_P0DMACR_t
* {
* unsigned TXTS : 4 ;
* unsigned RXTS : 4 ;
* unsigned TXABL : 4 ;
* unsigned RXABL : 4 ;
* unsigned Reserved : 16 ;
* } ;
*
* TXTS : Transmit Transaction Size ( TX_TRANSACTION_SIZE ) .
* This field defines the DMA transaction size in DWORDs for
* transmit ( system bus read , device write ) operation . [ . . . ]
*
* RXTS : Receive Transaction Size ( RX_TRANSACTION_SIZE ) .
* This field defines the Port DMA transaction size in DWORDs
* for receive ( system bus write , device read ) operation . [ . . . ]
*
* TXABL : Transmit Burst Limit .
* This field allows software to limit the VBUSP master read
* burst size . [ . . . ]
*
* RXABL : Receive Burst Limit .
* Allows software to limit the VBUSP master write burst
* size . [ . . . ]
*
* Reserved : Reserved .
*
*
* NOTE : According to the above document , the following alternative
* to the code below could perhaps be a better option
* ( or preparation ) for possible further improvements later :
* sunxi_clrsetbits ( hpriv - > mmio + AHCI_P0DMACR , 0 x0000ffff ,
* 0 x00000033 ) ;
*/
sunxi_clrsetbits(hpriv->mmio + AHCI_P0DMACR, 0 x0000ffff, 0 x00004433);
/* Start DMA */
sunxi_setbits(port_mmio + PORT_CMD, PORT_CMD_START);
}
static const struct ata_port_info ahci_sunxi_port_info = {
.flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ | ATA_FLAG_NO_DIPM,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static const struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int ahci_sunxi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
int rc;
hpriv = ahci_platform_get_resources(pdev, AHCI_PLATFORM_GET_RESETS);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
hpriv->start_engine = ahci_sunxi_start_engine;
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
rc = ahci_sunxi_phy_init(dev, hpriv->mmio);
if (rc)
goto disable_resources;
hpriv->flags = AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_MSI |
AHCI_HFLAG_YES_NCQ;
/*
* The sunxi sata controller seems to be unable to successfully do a
* soft reset if no pmp is attached , so disable pmp use unless
* requested , otherwise directly attached disks do not work .
*/
if (!enable_pmp)
hpriv->flags |= AHCI_HFLAG_NO_PMP;
rc = ahci_platform_init_host(pdev, hpriv, &ahci_sunxi_port_info,
&ahci_platform_sht);
if (rc)
goto disable_resources;
return 0 ;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
#ifdef CONFIG_PM_SLEEP
static int ahci_sunxi_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct ahci_host_priv *hpriv = host->private_data;
int rc;
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
rc = ahci_sunxi_phy_init(dev, hpriv->mmio);
if (rc)
goto disable_resources;
rc = ahci_platform_resume_host(dev);
if (rc)
goto disable_resources;
return 0 ;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
#endif
static SIMPLE_DEV_PM_OPS(ahci_sunxi_pm_ops, ahci_platform_suspend,
ahci_sunxi_resume);
static const struct of_device_id ahci_sunxi_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-ahci" , },
{ .compatible = "allwinner,sun8i-r40-ahci" , },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ahci_sunxi_of_match);
static struct platform_driver ahci_sunxi_driver = {
.probe = ahci_sunxi_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_sunxi_of_match,
.pm = &ahci_sunxi_pm_ops,
},
};
module_platform_driver(ahci_sunxi_driver);
MODULE_DESCRIPTION("Allwinner sunxi AHCI SATA driver" );
MODULE_AUTHOR("Olliver Schinagl <oliver@schinagl.nl>" );
MODULE_LICENSE("GPL" );
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