- 根目录:
- drivers
- ata
- pata_at32.c
/*
* AVR32 SMC/CFC PATA Driver
*
* Copyright (C) 2007 Atmel Norway
*
* 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.
*/
#define DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/err.h>
#include <linux/io.h>
#include <mach/board.h>
#include <mach/smc.h>
#define DRV_NAME "pata_at32"
#define DRV_VERSION "0.0.3"
/*
* CompactFlash controller memory layout relative to the base address:
*
* Attribute memory: 0000 0000 -> 003f ffff
* Common memory: 0040 0000 -> 007f ffff
* I/O memory: 0080 0000 -> 00bf ffff
* True IDE Mode: 00c0 0000 -> 00df ffff
* Alt IDE Mode: 00e0 0000 -> 00ff ffff
*
* Only True IDE and Alt True IDE mode are needed for this driver.
*
* True IDE mode => CS0 = 0, CS1 = 1 (cmd, error, stat, etc)
* Alt True IDE mode => CS0 = 1, CS1 = 0 (ctl, alt_stat)
*/
#define CF_IDE_OFFSET 0x00c00000
#define CF_ALT_IDE_OFFSET 0x00e00000
#define CF_RES_SIZE 2048
/*
* Define DEBUG_BUS if you are doing debugging of your own EBI -> PATA
* adaptor with a logic analyzer or similar.
*/
#undef DEBUG_BUS
/*
* ATA PIO modes
*
* Name | Mb/s | Min cycle time | Mask
* --------+-------+----------------+--------
* Mode 0 | 3.3 | 600 ns | 0x01
* Mode 1 | 5.2 | 383 ns | 0x03
* Mode 2 | 8.3 | 240 ns | 0x07
* Mode 3 | 11.1 | 180 ns | 0x0f
* Mode 4 | 16.7 | 120 ns | 0x1f
*
* Alter PIO_MASK below according to table to set maximal PIO mode.
*/
enum {
PIO_MASK = ATA_PIO4,
};
/*
* Struct containing private information about device.
*/
struct at32_ide_info {
unsigned int irq;
struct resource res_ide;
struct resource res_alt;
void __iomem *ide_addr;
void __iomem *alt_addr;
unsigned int cs;
struct smc_config smc;
};
/*
* Setup SMC for the given ATA timing.
*/
static int pata_at32_setup_timing(struct device *dev,
struct at32_ide_info *info,
const struct ata_timing *ata)
{
struct smc_config *smc = &info->smc;
struct smc_timing timing;
int active;
int recover;
memset(&timing, 0, sizeof(struct smc_timing));
/* Total cycle time */
timing.read_cycle = ata->cyc8b;
/* DIOR <= CFIOR timings */
timing.nrd_setup = ata->setup;
timing.nrd_pulse = ata->act8b;
timing.nrd_recover = ata->rec8b;
/* Convert nanosecond timing to clock cycles */
smc_set_timing(smc, &timing);
/* Add one extra cycle setup due to signal ring */
smc->nrd_setup = smc->nrd_setup + 1;
active = smc->nrd_setup + smc->nrd_pulse;
recover = smc->read_cycle - active;
/* Need at least two cycles recovery */
if (recover < 2)
smc->read_cycle = active + 2;
/* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */
smc->ncs_read_setup = 1;
smc->ncs_read_pulse = smc->read_cycle - 2;
/* Write timings same as read timings */
smc->write_cycle = smc->read_cycle;
smc->nwe_setup = smc->nrd_setup;
smc->nwe_pulse = smc->nrd_pulse;
smc->ncs_write_setup = smc->ncs_read_setup;
smc->ncs_write_pulse = smc->ncs_read_pulse;
/* Do some debugging output of ATA and SMC timings */
dev_dbg(dev, "ATA: C=%d S=%d P=%d R=%d\n",
ata->cyc8b, ata->setup, ata->act8b, ata->rec8b);
dev_dbg(dev, "SMC: C=%d S=%d P=%d NS=%d NP=%d\n",
smc->read_cycle, smc->nrd_setup, smc->nrd_pulse,
smc->ncs_read_setup, smc->ncs_read_pulse);
/* Finally, configure the SMC */
return smc_set_configuration(info->cs, smc);
}
/*
* Procedures for libATA.
*/
static void pata_at32_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_timing timing;
struct at32_ide_info *info = ap->host->private_data;
int ret;
/* Compute ATA timing */
ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);
if (ret) {
dev_warn(ap->dev, "Failed to compute ATA timing %d\n", ret);
return;
}
/* Setup SMC to ATA timing */
ret = pata_at32_setup_timing(ap->dev, info, &timing);
if (ret) {
dev_warn(ap->dev, "Failed to setup ATA timing %d\n", ret);
return;
}
}
static struct scsi_host_template at32_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations at32_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = pata_at32_set_piomode,
};
static int __init pata_at32_init_one(struct device *dev,
struct at32_ide_info *info)
{
struct ata_host *host;
struct ata_port *ap;
host = ata_host_alloc(dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
/* Setup ATA bindings */
ap->ops = &at32_port_ops;
ap->pio_mask = PIO_MASK;
ap->flags |= ATA_FLAG_SLAVE_POSS;
/*
* Since all 8-bit taskfile transfers has to go on the lower
* byte of the data bus and there is a bug in the SMC that
* makes it impossible to alter the bus width during runtime,
* we need to hardwire the address signals as follows:
*
* A_IDE(2:0) <= A_EBI(3:1)
*
* This makes all addresses on the EBI even, thus all data
* will be on the lower byte of the data bus. All addresses
* used by libATA need to be altered according to this.
*/
ap->ioaddr.altstatus_addr = info->alt_addr + (0x06 << 1);
ap->ioaddr.ctl_addr = info->alt_addr + (0x06 << 1);
ap->ioaddr.data_addr = info->ide_addr + (ATA_REG_DATA << 1);
ap->ioaddr.error_addr = info->ide_addr + (ATA_REG_ERR << 1);
ap->ioaddr.feature_addr = info->ide_addr + (ATA_REG_FEATURE << 1);
ap->ioaddr.nsect_addr = info->ide_addr + (ATA_REG_NSECT << 1);
ap->ioaddr.lbal_addr = info->ide_addr + (ATA_REG_LBAL << 1);
ap->ioaddr.lbam_addr = info->ide_addr + (ATA_REG_LBAM << 1);
ap->ioaddr.lbah_addr = info->ide_addr + (ATA_REG_LBAH << 1);
ap->ioaddr.device_addr = info->ide_addr + (ATA_REG_DEVICE << 1);
ap->ioaddr.status_addr = info->ide_addr + (ATA_REG_STATUS << 1);
ap->ioaddr.command_addr = info->ide_addr + (ATA_REG_CMD << 1);
/* Set info as private data of ATA host */
host->private_data = info;
/* Register ATA device and return */
return ata_host_activate(host, info->irq, ata_sff_interrupt,
IRQF_SHARED | IRQF_TRIGGER_RISING,
&at32_sht);
}
/*
* This function may come in handy for people analyzing their own
* EBI -> PATA adaptors.
*/
#ifdef DEBUG_BUS
static void __init pata_at32_debug_bus(struct device *dev,
struct at32_ide_info *info)
{
const int d1 = 0xff;
const int d2 = 0x00;
int i;
/* Write 8-bit values (registers) */
iowrite8(d1, info->alt_addr + (0x06 << 1));
iowrite8(d2, info->alt_addr + (0x06 << 1));
for (i = 0; i < 8; i++) {
iowrite8(d1, info->ide_addr + (i << 1));
iowrite8(d2, info->ide_addr + (i << 1));
}
/* Write 16 bit values (data) */
iowrite16(d1, info->ide_addr);
iowrite16(d1 << 8, info->ide_addr);
iowrite16(d1, info->ide_addr);
iowrite16(d1 << 8, info->ide_addr);
}
#endif
static int __init pata_at32_probe(struct platform_device *pdev)
{
const struct ata_timing initial_timing =
{XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};
struct device *dev = &pdev->dev;
struct at32_ide_info *info;
struct ide_platform_data *board = pdev->dev.platform_data;
struct resource *res;
int irq;
int ret;
if (!board)
return -ENXIO;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
/* Retrive IRQ */
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
/* Setup struct containing private information */
info = kzalloc(sizeof(struct at32_ide_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->irq = irq;
info->cs = board->cs;
/* Request memory resources */
info->res_ide.start = res->start + CF_IDE_OFFSET;
info->res_ide.end = info->res_ide.start + CF_RES_SIZE - 1;
info->res_ide.name = "ide";
info->res_ide.flags = IORESOURCE_MEM;
ret = request_resource(res, &info->res_ide);
if (ret)
goto err_req_res_ide;
info->res_alt.start = res->start + CF_ALT_IDE_OFFSET;
info->res_alt.end = info->res_alt.start + CF_RES_SIZE - 1;
info->res_alt.name = "alt";
info->res_alt.flags = IORESOURCE_MEM;
ret = request_resource(res, &info->res_alt);
if (ret)
goto err_req_res_alt;
/* Setup non-timing elements of SMC */
info->smc.bus_width = 2; /* 16 bit data bus */
info->smc.nrd_controlled = 1; /* Sample data on rising edge of NRD */
info->smc.nwe_controlled = 0; /* Drive data on falling edge of NCS */
info->smc.nwait_mode = 3; /* NWAIT is in READY mode */
info->smc.byte_write = 0; /* Byte select access type */
info->smc.tdf_mode = 0; /* TDF optimization disabled */
info->smc.tdf_cycles = 0; /* No TDF wait cycles */
/* Setup SMC to ATA timing */
ret = pata_at32_setup_timing(dev, info, &initial_timing);
if (ret)
goto err_setup_timing;
/* Map ATA address space */
ret = -ENOMEM;
info->ide_addr = devm_ioremap(dev, info->res_ide.start, 16);
info->alt_addr = devm_ioremap(dev, info->res_alt.start, 16);
if (!info->ide_addr || !info->alt_addr)
goto err_ioremap;
#ifdef DEBUG_BUS
pata_at32_debug_bus(dev, info);
#endif
/* Setup and register ATA device */
ret = pata_at32_init_one(dev, info);
if (ret)
goto err_ata_device;
return 0;
err_ata_device:
err_ioremap:
err_setup_timing:
release_resource(&info->res_alt);
err_req_res_alt:
release_resource(&info->res_ide);
err_req_res_ide:
kfree(info);
return ret;
}
static int __exit pata_at32_remove(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct at32_ide_info *info;
if (!host)
return 0;
info = host->private_data;
ata_host_detach(host);
if (!info)
return 0;
release_resource(&info->res_ide);
release_resource(&info->res_alt);
kfree(info);
return 0;
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:at32_ide");
static struct platform_driver pata_at32_driver = {
.remove = __exit_p(pata_at32_remove),
.driver = {
.name = "at32_ide",
.owner = THIS_MODULE,
},
};
static int __init pata_at32_init(void)
{
return platform_driver_probe(&pata_at32_driver, pata_at32_probe);
}
static void __exit pata_at32_exit(void)
{
platform_driver_unregister(&pata_at32_driver);
}
module_init(pata_at32_init);
module_exit(pata_at32_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AVR32 SMC/CFC PATA Driver");
MODULE_AUTHOR("Kristoffer Nyborg Gregertsen <kngregertsen@norway.atmel.com>");
MODULE_VERSION(DRV_VERSION);