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linux/drivers/ata/pata_ftide010.c
Linus Walleij 46cb52ad41 ata: ftide010: Add a quirk for SQ201 
The DMA is broken on this specific device for some unknown
reason (probably badly designed or plain broken interface
electronics) and will only work with PIO. Other users of
the same hardware does not have this problem.

Add a specific quirk so that this Gemini device gets
DMA turned off. Also fix up some code around passing the
port information around in probe while we're at it.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-27 14:25:54 -06:00

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/*
* Faraday Technology FTIDE010 driver
* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
*
* Includes portions of the SL2312/SL3516/Gemini PATA driver
* Copyright (C) 2003 StorLine, Inc <jason@storlink.com.tw>
* Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>
* Copyright (C) 2010 Frederic Pecourt <opengemini@free.fr>
* Copyright (C) 2011 Tobias Waldvogel <tobias.waldvogel@gmail.com>
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/libata.h>
#include <linux/bitops.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include "sata_gemini.h"
#define DRV_NAME "pata_ftide010"
/**
* struct ftide010 - state container for the Faraday FTIDE010
* @dev: pointer back to the device representing this controller
* @base: remapped I/O space address
* @pclk: peripheral clock for the IDE block
* @host: pointer to the ATA host for this device
* @master_cbl: master cable type
* @slave_cbl: slave cable type
* @sg: Gemini SATA bridge pointer, if running on the Gemini
* @master_to_sata0: Gemini SATA bridge: the ATA master is connected
* to the SATA0 bridge
* @slave_to_sata0: Gemini SATA bridge: the ATA slave is connected
* to the SATA0 bridge
* @master_to_sata1: Gemini SATA bridge: the ATA master is connected
* to the SATA1 bridge
* @slave_to_sata1: Gemini SATA bridge: the ATA slave is connected
* to the SATA1 bridge
*/
struct ftide010 {
struct device *dev;
void __iomem *base;
struct clk *pclk;
struct ata_host *host;
unsigned int master_cbl;
unsigned int slave_cbl;
/* Gemini-specific properties */
struct sata_gemini *sg;
bool master_to_sata0;
bool slave_to_sata0;
bool master_to_sata1;
bool slave_to_sata1;
};
#define FTIDE010_DMA_REG 0x00
#define FTIDE010_DMA_STATUS 0x02
#define FTIDE010_IDE_BMDTPR 0x04
#define FTIDE010_IDE_DEVICE_ID 0x08
#define FTIDE010_PIO_TIMING 0x10
#define FTIDE010_MWDMA_TIMING 0x11
#define FTIDE010_UDMA_TIMING0 0x12 /* Master */
#define FTIDE010_UDMA_TIMING1 0x13 /* Slave */
#define FTIDE010_CLK_MOD 0x14
/* These registers are mapped directly to the IDE registers */
#define FTIDE010_CMD_DATA 0x20
#define FTIDE010_ERROR_FEATURES 0x21
#define FTIDE010_NSECT 0x22
#define FTIDE010_LBAL 0x23
#define FTIDE010_LBAM 0x24
#define FTIDE010_LBAH 0x25
#define FTIDE010_DEVICE 0x26
#define FTIDE010_STATUS_COMMAND 0x27
#define FTIDE010_ALTSTAT_CTRL 0x36
/* Set this bit for UDMA mode 5 and 6 */
#define FTIDE010_UDMA_TIMING_MODE_56 BIT(7)
/* 0 = 50 MHz, 1 = 66 MHz */
#define FTIDE010_CLK_MOD_DEV0_CLK_SEL BIT(0)
#define FTIDE010_CLK_MOD_DEV1_CLK_SEL BIT(1)
/* Enable UDMA on a device */
#define FTIDE010_CLK_MOD_DEV0_UDMA_EN BIT(4)
#define FTIDE010_CLK_MOD_DEV1_UDMA_EN BIT(5)
static struct scsi_host_template pata_ftide010_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
/*
* Bus timings
*
* The unit of the below required timings is two clock periods of the ATA
* reference clock which is 30 nanoseconds per unit at 66MHz and 20
* nanoseconds per unit at 50 MHz. The PIO timings assume 33MHz speed for
* PIO.
*
* pio_active_time: array of 5 elements for T2 timing for Mode 0,
* 1, 2, 3 and 4. Range 0..15.
* pio_recovery_time: array of 5 elements for T2l timing for Mode 0,
* 1, 2, 3 and 4. Range 0..15.
* mdma_50_active_time: array of 4 elements for Td timing for multi
* word DMA, Mode 0, 1, and 2 at 50 MHz. Range 0..15.
* mdma_50_recovery_time: array of 4 elements for Tk timing for
* multi word DMA, Mode 0, 1 and 2 at 50 MHz. Range 0..15.
* mdma_66_active_time: array of 4 elements for Td timing for multi
* word DMA, Mode 0, 1 and 2 at 66 MHz. Range 0..15.
* mdma_66_recovery_time: array of 4 elements for Tk timing for
* multi word DMA, Mode 0, 1 and 2 at 66 MHz. Range 0..15.
* udma_50_setup_time: array of 4 elements for Tvds timing for ultra
* DMA, Mode 0, 1, 2, 3, 4 and 5 at 50 MHz. Range 0..7.
* udma_50_hold_time: array of 4 elements for Tdvh timing for
* multi word DMA, Mode 0, 1, 2, 3, 4 and 5 at 50 MHz, Range 0..7.
* udma_66_setup_time: array of 4 elements for Tvds timing for multi
* word DMA, Mode 0, 1, 2, 3, 4, 5 and 6 at 66 MHz. Range 0..7.
* udma_66_hold_time: array of 4 elements for Tdvh timing for
* multi word DMA, Mode 0, 1, 2, 3, 4, 5 and 6 at 66 MHz. Range 0..7.
*/
static const u8 pio_active_time[5] = {10, 10, 10, 3, 3};
static const u8 pio_recovery_time[5] = {10, 3, 1, 3, 1};
static const u8 mwdma_50_active_time[3] = {6, 2, 2};
static const u8 mwdma_50_recovery_time[3] = {6, 2, 1};
static const u8 mwdma_66_active_time[3] = {8, 3, 3};
static const u8 mwdma_66_recovery_time[3] = {8, 2, 1};
static const u8 udma_50_setup_time[6] = {3, 3, 2, 2, 1, 1};
static const u8 udma_50_hold_time[6] = {3, 1, 1, 1, 1, 1};
static const u8 udma_66_setup_time[7] = {4, 4, 3, 2, };
static const u8 udma_66_hold_time[7] = {};
/*
* We set 66 MHz for all MWDMA modes
*/
static const bool set_mdma_66_mhz[] = { true, true, true, true };
/*
* We set 66 MHz for UDMA modes 3, 4 and 6 and no others
*/
static const bool set_udma_66_mhz[] = { false, false, false, true, true, false, true };
static void ftide010_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct ftide010 *ftide = ap->host->private_data;
u8 speed = adev->dma_mode;
u8 devno = adev->devno & 1;
u8 udma_en_mask;
u8 f66m_en_mask;
u8 clkreg;
u8 timreg;
u8 i;
/* Target device 0 (master) or 1 (slave) */
if (!devno) {
udma_en_mask = FTIDE010_CLK_MOD_DEV0_UDMA_EN;
f66m_en_mask = FTIDE010_CLK_MOD_DEV0_CLK_SEL;
} else {
udma_en_mask = FTIDE010_CLK_MOD_DEV1_UDMA_EN;
f66m_en_mask = FTIDE010_CLK_MOD_DEV1_CLK_SEL;
}
clkreg = readb(ftide->base + FTIDE010_CLK_MOD);
clkreg &= ~udma_en_mask;
clkreg &= ~f66m_en_mask;
if (speed & XFER_UDMA_0) {
i = speed & ~XFER_UDMA_0;
dev_dbg(ftide->dev, "set UDMA mode %02x, index %d\n",
speed, i);
clkreg |= udma_en_mask;
if (set_udma_66_mhz[i]) {
clkreg |= f66m_en_mask;
timreg = udma_66_setup_time[i] << 4 |
udma_66_hold_time[i];
} else {
timreg = udma_50_setup_time[i] << 4 |
udma_50_hold_time[i];
}
/* A special bit needs to be set for modes 5 and 6 */
if (i >= 5)
timreg |= FTIDE010_UDMA_TIMING_MODE_56;
dev_dbg(ftide->dev, "UDMA write clkreg = %02x, timreg = %02x\n",
clkreg, timreg);
writeb(clkreg, ftide->base + FTIDE010_CLK_MOD);
writeb(timreg, ftide->base + FTIDE010_UDMA_TIMING0 + devno);
} else {
i = speed & ~XFER_MW_DMA_0;
dev_dbg(ftide->dev, "set MWDMA mode %02x, index %d\n",
speed, i);
if (set_mdma_66_mhz[i]) {
clkreg |= f66m_en_mask;
timreg = mwdma_66_active_time[i] << 4 |
mwdma_66_recovery_time[i];
} else {
timreg = mwdma_50_active_time[i] << 4 |
mwdma_50_recovery_time[i];
}
dev_dbg(ftide->dev,
"MWDMA write clkreg = %02x, timreg = %02x\n",
clkreg, timreg);
/* This will affect all devices */
writeb(clkreg, ftide->base + FTIDE010_CLK_MOD);
writeb(timreg, ftide->base + FTIDE010_MWDMA_TIMING);
}
/*
* Store the current device (master or slave) in ap->private_data
* so that .qc_issue() can detect if this changes and reprogram
* the DMA settings.
*/
ap->private_data = adev;
return;
}
static void ftide010_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ftide010 *ftide = ap->host->private_data;
u8 pio = adev->pio_mode - XFER_PIO_0;
dev_dbg(ftide->dev, "set PIO mode %02x, index %d\n",
adev->pio_mode, pio);
writeb(pio_active_time[pio] << 4 | pio_recovery_time[pio],
ftide->base + FTIDE010_PIO_TIMING);
}
/*
* We implement our own qc_issue() callback since we may need to set up
* the timings differently for master and slave transfers: the CLK_MOD_REG
* and MWDMA_TIMING_REG is shared between master and slave, so reprogramming
* this may be necessary.
*/
static unsigned int ftide010_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
/*
* If the device changed, i.e. slave->master, master->slave,
* then set up the DMA mode again so we are sure the timings
* are correct.
*/
if (adev != ap->private_data && ata_dma_enabled(adev))
ftide010_set_dmamode(ap, adev);
return ata_bmdma_qc_issue(qc);
}
static struct ata_port_operations pata_ftide010_port_ops = {
.inherits = &ata_bmdma_port_ops,
.set_dmamode = ftide010_set_dmamode,
.set_piomode = ftide010_set_piomode,
.qc_issue = ftide010_qc_issue,
};
static struct ata_port_info ftide010_port_info = {
.flags = ATA_FLAG_SLAVE_POSS,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.pio_mask = ATA_PIO4,
.port_ops = &pata_ftide010_port_ops,
};
#if IS_ENABLED(CONFIG_SATA_GEMINI)
static int pata_ftide010_gemini_port_start(struct ata_port *ap)
{
struct ftide010 *ftide = ap->host->private_data;
struct device *dev = ftide->dev;
struct sata_gemini *sg = ftide->sg;
int bridges = 0;
int ret;
ret = ata_bmdma_port_start(ap);
if (ret)
return ret;
if (ftide->master_to_sata0) {
dev_info(dev, "SATA0 (master) start\n");
ret = gemini_sata_start_bridge(sg, 0);
if (!ret)
bridges++;
}
if (ftide->master_to_sata1) {
dev_info(dev, "SATA1 (master) start\n");
ret = gemini_sata_start_bridge(sg, 1);
if (!ret)
bridges++;
}
/* Avoid double-starting */
if (ftide->slave_to_sata0 && !ftide->master_to_sata0) {
dev_info(dev, "SATA0 (slave) start\n");
ret = gemini_sata_start_bridge(sg, 0);
if (!ret)
bridges++;
}
/* Avoid double-starting */
if (ftide->slave_to_sata1 && !ftide->master_to_sata1) {
dev_info(dev, "SATA1 (slave) start\n");
ret = gemini_sata_start_bridge(sg, 1);
if (!ret)
bridges++;
}
dev_info(dev, "brought %d bridges online\n", bridges);
return (bridges > 0) ? 0 : -EINVAL; // -ENODEV;
}
static void pata_ftide010_gemini_port_stop(struct ata_port *ap)
{
struct ftide010 *ftide = ap->host->private_data;
struct device *dev = ftide->dev;
struct sata_gemini *sg = ftide->sg;
if (ftide->master_to_sata0) {
dev_info(dev, "SATA0 (master) stop\n");
gemini_sata_stop_bridge(sg, 0);
}
if (ftide->master_to_sata1) {
dev_info(dev, "SATA1 (master) stop\n");
gemini_sata_stop_bridge(sg, 1);
}
/* Avoid double-stopping */
if (ftide->slave_to_sata0 && !ftide->master_to_sata0) {
dev_info(dev, "SATA0 (slave) stop\n");
gemini_sata_stop_bridge(sg, 0);
}
/* Avoid double-stopping */
if (ftide->slave_to_sata1 && !ftide->master_to_sata1) {
dev_info(dev, "SATA1 (slave) stop\n");
gemini_sata_stop_bridge(sg, 1);
}
}
static int pata_ftide010_gemini_cable_detect(struct ata_port *ap)
{
struct ftide010 *ftide = ap->host->private_data;
/*
* Return the master cable, I have no clue how to return a different
* cable for the slave than for the master.
*/
return ftide->master_cbl;
}
static int pata_ftide010_gemini_init(struct ftide010 *ftide,
struct ata_port_info *pi,
bool is_ata1)
{
struct device *dev = ftide->dev;
struct sata_gemini *sg;
enum gemini_muxmode muxmode;
/* Look up SATA bridge */
sg = gemini_sata_bridge_get();
if (IS_ERR(sg))
return PTR_ERR(sg);
ftide->sg = sg;
muxmode = gemini_sata_get_muxmode(sg);
/* Special ops */
pata_ftide010_port_ops.port_start =
pata_ftide010_gemini_port_start;
pata_ftide010_port_ops.port_stop =
pata_ftide010_gemini_port_stop;
pata_ftide010_port_ops.cable_detect =
pata_ftide010_gemini_cable_detect;
/* Flag port as SATA-capable */
if (gemini_sata_bridge_enabled(sg, is_ata1))
pi->flags |= ATA_FLAG_SATA;
/* This device has broken DMA, only PIO works */
if (of_machine_is_compatible("itian,sq201")) {
pi->mwdma_mask = 0;
pi->udma_mask = 0;
}
/*
* We assume that a simple 40-wire cable is used in the PATA mode.
* if you're adding a system using the PATA interface, make sure
* the right cable is set up here, it might be necessary to use
* special hardware detection or encode the cable type in the device
* tree with special properties.
*/
if (!is_ata1) {
switch (muxmode) {
case GEMINI_MUXMODE_0:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_PATA40;
ftide->master_to_sata0 = true;
break;
case GEMINI_MUXMODE_1:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_NONE;
ftide->master_to_sata0 = true;
break;
case GEMINI_MUXMODE_2:
ftide->master_cbl = ATA_CBL_PATA40;
ftide->slave_cbl = ATA_CBL_PATA40;
break;
case GEMINI_MUXMODE_3:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_SATA;
ftide->master_to_sata0 = true;
ftide->slave_to_sata1 = true;
break;
}
} else {
switch (muxmode) {
case GEMINI_MUXMODE_0:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_NONE;
ftide->master_to_sata1 = true;
break;
case GEMINI_MUXMODE_1:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_PATA40;
ftide->master_to_sata1 = true;
break;
case GEMINI_MUXMODE_2:
ftide->master_cbl = ATA_CBL_SATA;
ftide->slave_cbl = ATA_CBL_SATA;
ftide->slave_to_sata0 = true;
ftide->master_to_sata1 = true;
break;
case GEMINI_MUXMODE_3:
ftide->master_cbl = ATA_CBL_PATA40;
ftide->slave_cbl = ATA_CBL_PATA40;
break;
}
}
dev_info(dev, "set up Gemini PATA%d\n", is_ata1);
return 0;
}
#else
static int pata_ftide010_gemini_init(struct ftide010 *ftide,
struct ata_port_info *pi,
bool is_ata1)
{
return -ENOTSUPP;
}
#endif
static int pata_ftide010_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct ata_port_info pi = ftide010_port_info;
const struct ata_port_info *ppi[] = { &pi, NULL };
struct ftide010 *ftide;
struct resource *res;
int irq;
int ret;
int i;
ftide = devm_kzalloc(dev, sizeof(*ftide), GFP_KERNEL);
if (!ftide)
return -ENOMEM;
ftide->dev = dev;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
ftide->base = devm_ioremap_resource(dev, res);
if (IS_ERR(ftide->base))
return PTR_ERR(ftide->base);
ftide->pclk = devm_clk_get(dev, "PCLK");
if (!IS_ERR(ftide->pclk)) {
ret = clk_prepare_enable(ftide->pclk);
if (ret) {
dev_err(dev, "failed to enable PCLK\n");
return ret;
}
}
/* Some special Cortina Gemini init, if needed */
if (of_device_is_compatible(np, "cortina,gemini-pata")) {
/*
* We need to know which instance is probing (the
* Gemini has two instances of FTIDE010) and we do
* this simply by looking at the physical base
* address, which is 0x63400000 for ATA1, else we
* are ATA0. This will also set up the cable types.
*/
ret = pata_ftide010_gemini_init(ftide,
&pi,
(res->start == 0x63400000));
if (ret)
goto err_dis_clk;
} else {
/* Else assume we are connected using PATA40 */
ftide->master_cbl = ATA_CBL_PATA40;
ftide->slave_cbl = ATA_CBL_PATA40;
}
ftide->host = ata_host_alloc_pinfo(dev, ppi, 1);
if (!ftide->host) {
ret = -ENOMEM;
goto err_dis_clk;
}
ftide->host->private_data = ftide;
for (i = 0; i < ftide->host->n_ports; i++) {
struct ata_port *ap = ftide->host->ports[i];
struct ata_ioports *ioaddr = &ap->ioaddr;
ioaddr->bmdma_addr = ftide->base + FTIDE010_DMA_REG;
ioaddr->cmd_addr = ftide->base + FTIDE010_CMD_DATA;
ioaddr->ctl_addr = ftide->base + FTIDE010_ALTSTAT_CTRL;
ioaddr->altstatus_addr = ftide->base + FTIDE010_ALTSTAT_CTRL;
ata_sff_std_ports(ioaddr);
}
dev_info(dev, "device ID %08x, irq %d, reg %pR\n",
readl(ftide->base + FTIDE010_IDE_DEVICE_ID), irq, res);
ret = ata_host_activate(ftide->host, irq, ata_bmdma_interrupt,
0, &pata_ftide010_sht);
if (ret)
goto err_dis_clk;
return 0;
err_dis_clk:
if (!IS_ERR(ftide->pclk))
clk_disable_unprepare(ftide->pclk);
return ret;
}
static int pata_ftide010_remove(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct ftide010 *ftide = host->private_data;
ata_host_detach(ftide->host);
if (!IS_ERR(ftide->pclk))
clk_disable_unprepare(ftide->pclk);
return 0;
}
static const struct of_device_id pata_ftide010_of_match[] = {
{
.compatible = "faraday,ftide010",
},
{},
};
static struct platform_driver pata_ftide010_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(pata_ftide010_of_match),
},
.probe = pata_ftide010_probe,
.remove = pata_ftide010_remove,
};
module_platform_driver(pata_ftide010_driver);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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