diff options
Diffstat (limited to 'kernel/drivers/ata/pata_at32.c')
| -rw-r--r-- | kernel/drivers/ata/pata_at32.c | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/kernel/drivers/ata/pata_at32.c b/kernel/drivers/ata/pata_at32.c new file mode 100644 index 000000000..9aeb7a6dd --- /dev/null +++ b/kernel/drivers/ata/pata_at32.c @@ -0,0 +1,400 @@ +/* + * 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 = dev_get_platdata(&pdev->dev); + 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", + }, +}; + +module_platform_driver_probe(pata_at32_driver, pata_at32_probe); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("AVR32 SMC/CFC PATA Driver"); +MODULE_AUTHOR("Kristoffer Nyborg Gregertsen <kngregertsen@norway.atmel.com>"); +MODULE_VERSION(DRV_VERSION); |