+++ /dev/null
-/*
- * 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);
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