swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: ba47d845d715a010f7b51f6f89bae32845e6acb7 authored by Linus Torvalds on 19 July 2020, 22:41:18 UTC
Linux 5.8-rc6
Linux 5.8-rc6
Tip revision: ba47d84
pata_samsung_cf.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* PATA driver for Samsung SoCs.
* Supports CF Interface in True IDE mode. Currently only PIO mode has been
* implemented; UDMA support has to be added.
*
* Based on:
* PATA driver for AT91SAM9260 Static Memory Controller
* PATA driver for Toshiba SCC controller
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/platform_data/ata-samsung_cf.h>
#define DRV_NAME "pata_samsung_cf"
#define DRV_VERSION "0.1"
#define S3C_CFATA_REG(x) (x)
#define S3C_CFATA_MUX S3C_CFATA_REG(0x0)
#define S3C_ATA_CTRL S3C_CFATA_REG(0x0)
#define S3C_ATA_CMD S3C_CFATA_REG(0x8)
#define S3C_ATA_IRQ S3C_CFATA_REG(0x10)
#define S3C_ATA_IRQ_MSK S3C_CFATA_REG(0x14)
#define S3C_ATA_CFG S3C_CFATA_REG(0x18)
#define S3C_ATA_PIO_TIME S3C_CFATA_REG(0x2c)
#define S3C_ATA_PIO_DTR S3C_CFATA_REG(0x54)
#define S3C_ATA_PIO_FED S3C_CFATA_REG(0x58)
#define S3C_ATA_PIO_SCR S3C_CFATA_REG(0x5c)
#define S3C_ATA_PIO_LLR S3C_CFATA_REG(0x60)
#define S3C_ATA_PIO_LMR S3C_CFATA_REG(0x64)
#define S3C_ATA_PIO_LHR S3C_CFATA_REG(0x68)
#define S3C_ATA_PIO_DVR S3C_CFATA_REG(0x6c)
#define S3C_ATA_PIO_CSD S3C_CFATA_REG(0x70)
#define S3C_ATA_PIO_DAD S3C_CFATA_REG(0x74)
#define S3C_ATA_PIO_RDATA S3C_CFATA_REG(0x7c)
#define S3C_CFATA_MUX_TRUEIDE 0x01
#define S3C_ATA_CFG_SWAP 0x40
#define S3C_ATA_CFG_IORDYEN 0x02
enum s3c_cpu_type {
TYPE_S3C64XX,
TYPE_S5PV210,
};
/*
* struct s3c_ide_info - S3C PATA instance.
* @clk: The clock resource for this controller.
* @ide_addr: The area mapped for the hardware registers.
* @sfr_addr: The area mapped for the special function registers.
* @irq: The IRQ number we are using.
* @cpu_type: The exact type of this controller.
* @fifo_status_reg: The ATA_FIFO_STATUS register offset.
*/
struct s3c_ide_info {
struct clk *clk;
void __iomem *ide_addr;
void __iomem *sfr_addr;
int irq;
enum s3c_cpu_type cpu_type;
unsigned int fifo_status_reg;
};
static void pata_s3c_set_endian(void __iomem *s3c_ide_regbase, u8 mode)
{
u32 reg = readl(s3c_ide_regbase + S3C_ATA_CFG);
reg = mode ? (reg & ~S3C_ATA_CFG_SWAP) : (reg | S3C_ATA_CFG_SWAP);
writel(reg, s3c_ide_regbase + S3C_ATA_CFG);
}
static void pata_s3c_cfg_mode(void __iomem *s3c_ide_sfrbase)
{
/* Select true-ide as the internal operating mode */
writel(readl(s3c_ide_sfrbase + S3C_CFATA_MUX) | S3C_CFATA_MUX_TRUEIDE,
s3c_ide_sfrbase + S3C_CFATA_MUX);
}
static unsigned long
pata_s3c_setup_timing(struct s3c_ide_info *info, const struct ata_timing *ata)
{
int t1 = ata->setup;
int t2 = ata->act8b;
int t2i = ata->rec8b;
ulong piotime;
piotime = ((t2i & 0xff) << 12) | ((t2 & 0xff) << 4) | (t1 & 0xf);
return piotime;
}
static void pata_s3c_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct s3c_ide_info *info = ap->host->private_data;
struct ata_timing timing;
int cycle_time;
ulong ata_cfg = readl(info->ide_addr + S3C_ATA_CFG);
ulong piotime;
/* Enables IORDY if mode requires it */
if (ata_pio_need_iordy(adev))
ata_cfg |= S3C_ATA_CFG_IORDYEN;
else
ata_cfg &= ~S3C_ATA_CFG_IORDYEN;
cycle_time = (int)(1000000000UL / clk_get_rate(info->clk));
ata_timing_compute(adev, adev->pio_mode, &timing,
cycle_time * 1000, 0);
piotime = pata_s3c_setup_timing(info, &timing);
writel(ata_cfg, info->ide_addr + S3C_ATA_CFG);
writel(piotime, info->ide_addr + S3C_ATA_PIO_TIME);
}
/*
* Waits until the IDE controller is able to perform next read/write
* operation to the disk. Needed for 64XX series boards only.
*/
static int wait_for_host_ready(struct s3c_ide_info *info)
{
ulong timeout;
void __iomem *fifo_reg = info->ide_addr + info->fifo_status_reg;
/* wait for maximum of 20 msec */
timeout = jiffies + msecs_to_jiffies(20);
while (time_before(jiffies, timeout)) {
if ((readl(fifo_reg) >> 28) == 0)
return 0;
}
return -EBUSY;
}
/*
* Writes to one of the task file registers.
*/
static void ata_outb(struct ata_host *host, u8 addr, void __iomem *reg)
{
struct s3c_ide_info *info = host->private_data;
wait_for_host_ready(info);
writeb(addr, reg);
}
/*
* Reads from one of the task file registers.
*/
static u8 ata_inb(struct ata_host *host, void __iomem *reg)
{
struct s3c_ide_info *info = host->private_data;
u8 temp;
wait_for_host_ready(info);
(void) readb(reg);
wait_for_host_ready(info);
temp = readb(info->ide_addr + S3C_ATA_PIO_RDATA);
return temp;
}
/*
* pata_s3c_tf_load - send taskfile registers to host controller
*/
static void pata_s3c_tf_load(struct ata_port *ap,
const struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
if (tf->ctl != ap->last_ctl) {
ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
ap->last_ctl = tf->ctl;
ata_wait_idle(ap);
}
if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
ata_outb(ap->host, tf->hob_feature, ioaddr->feature_addr);
ata_outb(ap->host, tf->hob_nsect, ioaddr->nsect_addr);
ata_outb(ap->host, tf->hob_lbal, ioaddr->lbal_addr);
ata_outb(ap->host, tf->hob_lbam, ioaddr->lbam_addr);
ata_outb(ap->host, tf->hob_lbah, ioaddr->lbah_addr);
}
if (is_addr) {
ata_outb(ap->host, tf->feature, ioaddr->feature_addr);
ata_outb(ap->host, tf->nsect, ioaddr->nsect_addr);
ata_outb(ap->host, tf->lbal, ioaddr->lbal_addr);
ata_outb(ap->host, tf->lbam, ioaddr->lbam_addr);
ata_outb(ap->host, tf->lbah, ioaddr->lbah_addr);
}
if (tf->flags & ATA_TFLAG_DEVICE)
ata_outb(ap->host, tf->device, ioaddr->device_addr);
ata_wait_idle(ap);
}
/*
* pata_s3c_tf_read - input device's ATA taskfile shadow registers
*/
static void pata_s3c_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
tf->feature = ata_inb(ap->host, ioaddr->error_addr);
tf->nsect = ata_inb(ap->host, ioaddr->nsect_addr);
tf->lbal = ata_inb(ap->host, ioaddr->lbal_addr);
tf->lbam = ata_inb(ap->host, ioaddr->lbam_addr);
tf->lbah = ata_inb(ap->host, ioaddr->lbah_addr);
tf->device = ata_inb(ap->host, ioaddr->device_addr);
if (tf->flags & ATA_TFLAG_LBA48) {
ata_outb(ap->host, tf->ctl | ATA_HOB, ioaddr->ctl_addr);
tf->hob_feature = ata_inb(ap->host, ioaddr->error_addr);
tf->hob_nsect = ata_inb(ap->host, ioaddr->nsect_addr);
tf->hob_lbal = ata_inb(ap->host, ioaddr->lbal_addr);
tf->hob_lbam = ata_inb(ap->host, ioaddr->lbam_addr);
tf->hob_lbah = ata_inb(ap->host, ioaddr->lbah_addr);
ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
ap->last_ctl = tf->ctl;
}
}
/*
* pata_s3c_exec_command - issue ATA command to host controller
*/
static void pata_s3c_exec_command(struct ata_port *ap,
const struct ata_taskfile *tf)
{
ata_outb(ap->host, tf->command, ap->ioaddr.command_addr);
ata_sff_pause(ap);
}
/*
* pata_s3c_check_status - Read device status register
*/
static u8 pata_s3c_check_status(struct ata_port *ap)
{
return ata_inb(ap->host, ap->ioaddr.status_addr);
}
/*
* pata_s3c_check_altstatus - Read alternate device status register
*/
static u8 pata_s3c_check_altstatus(struct ata_port *ap)
{
return ata_inb(ap->host, ap->ioaddr.altstatus_addr);
}
/*
* pata_s3c_data_xfer - Transfer data by PIO
*/
static unsigned int pata_s3c_data_xfer(struct ata_queued_cmd *qc,
unsigned char *buf, unsigned int buflen, int rw)
{
struct ata_port *ap = qc->dev->link->ap;
struct s3c_ide_info *info = ap->host->private_data;
void __iomem *data_addr = ap->ioaddr.data_addr;
unsigned int words = buflen >> 1, i;
u16 *data_ptr = (u16 *)buf;
/* Requires wait same as in ata_inb/ata_outb */
if (rw == READ)
for (i = 0; i < words; i++, data_ptr++) {
wait_for_host_ready(info);
(void) readw(data_addr);
wait_for_host_ready(info);
*data_ptr = readw(info->ide_addr
+ S3C_ATA_PIO_RDATA);
}
else
for (i = 0; i < words; i++, data_ptr++) {
wait_for_host_ready(info);
writew(*data_ptr, data_addr);
}
if (buflen & 0x01)
dev_err(ap->dev, "unexpected trailing data\n");
return words << 1;
}
/*
* pata_s3c_dev_select - Select device on ATA bus
*/
static void pata_s3c_dev_select(struct ata_port *ap, unsigned int device)
{
u8 tmp = ATA_DEVICE_OBS;
if (device != 0)
tmp |= ATA_DEV1;
ata_outb(ap->host, tmp, ap->ioaddr.device_addr);
ata_sff_pause(ap);
}
/*
* pata_s3c_devchk - PATA device presence detection
*/
static unsigned int pata_s3c_devchk(struct ata_port *ap,
unsigned int device)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u8 nsect, lbal;
pata_s3c_dev_select(ap, device);
ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
ata_outb(ap->host, 0xaa, ioaddr->nsect_addr);
ata_outb(ap->host, 0x55, ioaddr->lbal_addr);
ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
nsect = ata_inb(ap->host, ioaddr->nsect_addr);
lbal = ata_inb(ap->host, ioaddr->lbal_addr);
if ((nsect == 0x55) && (lbal == 0xaa))
return 1; /* we found a device */
return 0; /* nothing found */
}
/*
* pata_s3c_wait_after_reset - wait for devices to become ready after reset
*/
static int pata_s3c_wait_after_reset(struct ata_link *link,
unsigned long deadline)
{
int rc;
ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
/* always check readiness of the master device */
rc = ata_sff_wait_ready(link, deadline);
/* -ENODEV means the odd clown forgot the D7 pulldown resistor
* and TF status is 0xff, bail out on it too.
*/
if (rc)
return rc;
return 0;
}
/*
* pata_s3c_bus_softreset - PATA device software reset
*/
static int pata_s3c_bus_softreset(struct ata_port *ap,
unsigned long deadline)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
/* software reset. causes dev0 to be selected */
ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
udelay(20);
ata_outb(ap->host, ap->ctl | ATA_SRST, ioaddr->ctl_addr);
udelay(20);
ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
ap->last_ctl = ap->ctl;
return pata_s3c_wait_after_reset(&ap->link, deadline);
}
/*
* pata_s3c_softreset - reset host port via ATA SRST
*/
static int pata_s3c_softreset(struct ata_link *link, unsigned int *classes,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
unsigned int devmask = 0;
int rc;
u8 err;
/* determine if device 0 is present */
if (pata_s3c_devchk(ap, 0))
devmask |= (1 << 0);
/* select device 0 again */
pata_s3c_dev_select(ap, 0);
/* issue bus reset */
rc = pata_s3c_bus_softreset(ap, deadline);
/* if link is occupied, -ENODEV too is an error */
if (rc && rc != -ENODEV) {
ata_link_err(link, "SRST failed (errno=%d)\n", rc);
return rc;
}
/* determine by signature whether we have ATA or ATAPI devices */
classes[0] = ata_sff_dev_classify(&ap->link.device[0],
devmask & (1 << 0), &err);
return 0;
}
/*
* pata_s3c_set_devctl - Write device control register
*/
static void pata_s3c_set_devctl(struct ata_port *ap, u8 ctl)
{
ata_outb(ap->host, ctl, ap->ioaddr.ctl_addr);
}
static struct scsi_host_template pata_s3c_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations pata_s3c_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_check_status = pata_s3c_check_status,
.sff_check_altstatus = pata_s3c_check_altstatus,
.sff_tf_load = pata_s3c_tf_load,
.sff_tf_read = pata_s3c_tf_read,
.sff_data_xfer = pata_s3c_data_xfer,
.sff_exec_command = pata_s3c_exec_command,
.sff_dev_select = pata_s3c_dev_select,
.sff_set_devctl = pata_s3c_set_devctl,
.softreset = pata_s3c_softreset,
.set_piomode = pata_s3c_set_piomode,
};
static struct ata_port_operations pata_s5p_port_ops = {
.inherits = &ata_sff_port_ops,
.set_piomode = pata_s3c_set_piomode,
};
static void pata_s3c_enable(void __iomem *s3c_ide_regbase, bool state)
{
u32 temp = readl(s3c_ide_regbase + S3C_ATA_CTRL);
temp = state ? (temp | 1) : (temp & ~1);
writel(temp, s3c_ide_regbase + S3C_ATA_CTRL);
}
static irqreturn_t pata_s3c_irq(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct s3c_ide_info *info = host->private_data;
u32 reg;
reg = readl(info->ide_addr + S3C_ATA_IRQ);
writel(reg, info->ide_addr + S3C_ATA_IRQ);
return ata_sff_interrupt(irq, dev_instance);
}
static void pata_s3c_hwinit(struct s3c_ide_info *info,
struct s3c_ide_platdata *pdata)
{
switch (info->cpu_type) {
case TYPE_S3C64XX:
/* Configure as big endian */
pata_s3c_cfg_mode(info->sfr_addr);
pata_s3c_set_endian(info->ide_addr, 1);
pata_s3c_enable(info->ide_addr, true);
msleep(100);
/* Remove IRQ Status */
writel(0x1f, info->ide_addr + S3C_ATA_IRQ);
writel(0x1b, info->ide_addr + S3C_ATA_IRQ_MSK);
break;
case TYPE_S5PV210:
/* Configure as little endian */
pata_s3c_set_endian(info->ide_addr, 0);
pata_s3c_enable(info->ide_addr, true);
msleep(100);
/* Remove IRQ Status */
writel(0x3f, info->ide_addr + S3C_ATA_IRQ);
writel(0x3f, info->ide_addr + S3C_ATA_IRQ_MSK);
break;
default:
BUG();
}
}
static int __init pata_s3c_probe(struct platform_device *pdev)
{
struct s3c_ide_platdata *pdata = dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
struct s3c_ide_info *info;
struct resource *res;
struct ata_port *ap;
struct ata_host *host;
enum s3c_cpu_type cpu_type;
int ret;
cpu_type = platform_get_device_id(pdev)->driver_data;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->irq = platform_get_irq(pdev, 0);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
info->ide_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(info->ide_addr))
return PTR_ERR(info->ide_addr);
info->clk = devm_clk_get(&pdev->dev, "cfcon");
if (IS_ERR(info->clk)) {
dev_err(dev, "failed to get access to cf controller clock\n");
ret = PTR_ERR(info->clk);
info->clk = NULL;
return ret;
}
clk_enable(info->clk);
/* init ata host */
host = ata_host_alloc(dev, 1);
if (!host) {
dev_err(dev, "failed to allocate ide host\n");
ret = -ENOMEM;
goto stop_clk;
}
ap = host->ports[0];
ap->pio_mask = ATA_PIO4;
if (cpu_type == TYPE_S3C64XX) {
ap->ops = &pata_s3c_port_ops;
info->sfr_addr = info->ide_addr + 0x1800;
info->ide_addr += 0x1900;
info->fifo_status_reg = 0x94;
} else {
ap->ops = &pata_s5p_port_ops;
info->fifo_status_reg = 0x84;
}
info->cpu_type = cpu_type;
if (info->irq <= 0) {
ap->flags |= ATA_FLAG_PIO_POLLING;
info->irq = 0;
ata_port_desc(ap, "no IRQ, using PIO polling\n");
}
ap->ioaddr.cmd_addr = info->ide_addr + S3C_ATA_CMD;
ap->ioaddr.data_addr = info->ide_addr + S3C_ATA_PIO_DTR;
ap->ioaddr.error_addr = info->ide_addr + S3C_ATA_PIO_FED;
ap->ioaddr.feature_addr = info->ide_addr + S3C_ATA_PIO_FED;
ap->ioaddr.nsect_addr = info->ide_addr + S3C_ATA_PIO_SCR;
ap->ioaddr.lbal_addr = info->ide_addr + S3C_ATA_PIO_LLR;
ap->ioaddr.lbam_addr = info->ide_addr + S3C_ATA_PIO_LMR;
ap->ioaddr.lbah_addr = info->ide_addr + S3C_ATA_PIO_LHR;
ap->ioaddr.device_addr = info->ide_addr + S3C_ATA_PIO_DVR;
ap->ioaddr.status_addr = info->ide_addr + S3C_ATA_PIO_CSD;
ap->ioaddr.command_addr = info->ide_addr + S3C_ATA_PIO_CSD;
ap->ioaddr.altstatus_addr = info->ide_addr + S3C_ATA_PIO_DAD;
ap->ioaddr.ctl_addr = info->ide_addr + S3C_ATA_PIO_DAD;
ata_port_desc(ap, "mmio cmd 0x%llx ",
(unsigned long long)res->start);
host->private_data = info;
if (pdata && pdata->setup_gpio)
pdata->setup_gpio();
/* Set endianness and enable the interface */
pata_s3c_hwinit(info, pdata);
ret = ata_host_activate(host, info->irq,
info->irq ? pata_s3c_irq : NULL,
0, &pata_s3c_sht);
if (ret)
goto stop_clk;
return 0;
stop_clk:
clk_disable(info->clk);
return ret;
}
static int __exit pata_s3c_remove(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct s3c_ide_info *info = host->private_data;
ata_host_detach(host);
clk_disable(info->clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int pata_s3c_suspend(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
return ata_host_suspend(host, PMSG_SUSPEND);
}
static int pata_s3c_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct s3c_ide_platdata *pdata = dev_get_platdata(dev);
struct s3c_ide_info *info = host->private_data;
pata_s3c_hwinit(info, pdata);
ata_host_resume(host);
return 0;
}
static const struct dev_pm_ops pata_s3c_pm_ops = {
.suspend = pata_s3c_suspend,
.resume = pata_s3c_resume,
};
#endif
/* driver device registration */
static const struct platform_device_id pata_s3c_driver_ids[] = {
{
.name = "s3c64xx-pata",
.driver_data = TYPE_S3C64XX,
}, {
.name = "s5pv210-pata",
.driver_data = TYPE_S5PV210,
},
{ }
};
MODULE_DEVICE_TABLE(platform, pata_s3c_driver_ids);
static struct platform_driver pata_s3c_driver = {
.remove = __exit_p(pata_s3c_remove),
.id_table = pata_s3c_driver_ids,
.driver = {
.name = DRV_NAME,
#ifdef CONFIG_PM_SLEEP
.pm = &pata_s3c_pm_ops,
#endif
},
};
module_platform_driver_probe(pata_s3c_driver, pata_s3c_probe);
MODULE_AUTHOR("Abhilash Kesavan, <a.kesavan@samsung.com>");
MODULE_DESCRIPTION("low-level driver for Samsung PATA controller");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);