diff options
Diffstat (limited to 'drivers/ata/pata_at91.c')
| -rw-r--r-- | drivers/ata/pata_at91.c | 503 |
1 files changed, 0 insertions, 503 deletions
diff --git a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c deleted file mode 100644 index fd5b34f0d007..000000000000 --- a/drivers/ata/pata_at91.c +++ /dev/null @@ -1,503 +0,0 @@ -/* - * PATA driver for AT91SAM9260 Static Memory Controller - * with CompactFlash interface in True IDE mode - * - * Copyright (C) 2009 Matyukevich Sergey - * 2011 Igor Plyatov - * - * Based on: - * * generic platform driver by Paul Mundt: drivers/ata/pata_platform.c - * * pata_at32 driver by Kristoffer Nyborg Gregertsen - * * at91_ide driver by Stanislaw Gruszka - * - * 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. - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/blkdev.h> -#include <linux/gfp.h> -#include <scsi/scsi_host.h> -#include <linux/ata.h> -#include <linux/clk.h> -#include <linux/libata.h> -#include <linux/mfd/syscon.h> -#include <linux/mfd/syscon/atmel-smc.h> -#include <linux/platform_device.h> -#include <linux/ata_platform.h> -#include <linux/platform_data/atmel.h> -#include <linux/regmap.h> -#include <linux/gpio.h> - -#define DRV_NAME "pata_at91" -#define DRV_VERSION "0.3" - -#define CF_IDE_OFFSET 0x00c00000 -#define CF_ALT_IDE_OFFSET 0x00e00000 -#define CF_IDE_RES_SIZE 0x08 -#define CS_PULSE_MAXIMUM 319 -#define ER_SMC_CALC 1 -#define ER_SMC_RECALC 2 - -struct at91_ide_info { - unsigned long mode; - unsigned int cs; - struct clk *mck; - void __iomem *ide_addr; - void __iomem *alt_addr; -}; - -/** - * struct smc_range - range of valid values for SMC register. - */ -struct smc_range { - int min; - int max; -}; - -struct regmap *smc; - -struct at91sam9_smc_generic_fields { - struct regmap_field *setup; - struct regmap_field *pulse; - struct regmap_field *cycle; - struct regmap_field *mode; -} fields; - -/** - * adjust_smc_value - adjust value for one of SMC registers. - * @value: adjusted value - * @range: array of SMC ranges with valid values - * @size: SMC ranges array size - * - * This returns the difference between input and output value or negative - * in case of invalid input value. - * If negative returned, then output value = maximal possible from ranges. - */ -static int adjust_smc_value(int *value, struct smc_range *range, int size) -{ - int maximum = (range + size - 1)->max; - int remainder; - - do { - if (*value < range->min) { - remainder = range->min - *value; - *value = range->min; /* nearest valid value */ - return remainder; - } else if ((range->min <= *value) && (*value <= range->max)) - return 0; - - range++; - } while (--size); - *value = maximum; - - return -1; /* invalid value */ -} - -/** - * calc_smc_vals - calculate SMC register values - * @dev: ATA device - * @setup: SMC_SETUP register value - * @pulse: SMC_PULSE register value - * @cycle: SMC_CYCLE register value - * - * This returns negative in case of invalid values for SMC registers: - * -ER_SMC_RECALC - recalculation required for SMC values, - * -ER_SMC_CALC - calculation failed (invalid input values). - * - * SMC use special coding scheme, see "Coding and Range of Timing - * Parameters" table from AT91SAM9 datasheets. - * - * SMC_SETUP = 128*setup[5] + setup[4:0] - * SMC_PULSE = 256*pulse[6] + pulse[5:0] - * SMC_CYCLE = 256*cycle[8:7] + cycle[6:0] - */ -static int calc_smc_vals(struct device *dev, - int *setup, int *pulse, int *cycle, int *cs_pulse) -{ - int ret_val; - int err = 0; - struct smc_range range_setup[] = { /* SMC_SETUP valid values */ - {.min = 0, .max = 31}, /* first range */ - {.min = 128, .max = 159} /* second range */ - }; - struct smc_range range_pulse[] = { /* SMC_PULSE valid values */ - {.min = 0, .max = 63}, /* first range */ - {.min = 256, .max = 319} /* second range */ - }; - struct smc_range range_cycle[] = { /* SMC_CYCLE valid values */ - {.min = 0, .max = 127}, /* first range */ - {.min = 256, .max = 383}, /* second range */ - {.min = 512, .max = 639}, /* third range */ - {.min = 768, .max = 895} /* fourth range */ - }; - - ret_val = adjust_smc_value(setup, range_setup, ARRAY_SIZE(range_setup)); - if (ret_val < 0) - dev_warn(dev, "maximal SMC Setup value\n"); - else - *cycle += ret_val; - - ret_val = adjust_smc_value(pulse, range_pulse, ARRAY_SIZE(range_pulse)); - if (ret_val < 0) - dev_warn(dev, "maximal SMC Pulse value\n"); - else - *cycle += ret_val; - - ret_val = adjust_smc_value(cycle, range_cycle, ARRAY_SIZE(range_cycle)); - if (ret_val < 0) - dev_warn(dev, "maximal SMC Cycle value\n"); - - *cs_pulse = *cycle; - if (*cs_pulse > CS_PULSE_MAXIMUM) { - dev_err(dev, "unable to calculate valid SMC settings\n"); - return -ER_SMC_CALC; - } - - ret_val = adjust_smc_value(cs_pulse, range_pulse, - ARRAY_SIZE(range_pulse)); - if (ret_val < 0) { - dev_warn(dev, "maximal SMC CS Pulse value\n"); - } else if (ret_val != 0) { - *cycle = *cs_pulse; - dev_warn(dev, "SMC Cycle extended\n"); - err = -ER_SMC_RECALC; - } - - return err; -} - -/** - * to_smc_format - convert values into SMC format - * @setup: SETUP value of SMC Setup Register - * @pulse: PULSE value of SMC Pulse Register - * @cycle: CYCLE value of SMC Cycle Register - * @cs_pulse: NCS_PULSE value of SMC Pulse Register - */ -static void to_smc_format(int *setup, int *pulse, int *cycle, int *cs_pulse) -{ - *setup = (*setup & 0x1f) | ((*setup & 0x80) >> 2); - *pulse = (*pulse & 0x3f) | ((*pulse & 0x100) >> 2); - *cycle = (*cycle & 0x7f) | ((*cycle & 0x300) >> 1); - *cs_pulse = (*cs_pulse & 0x3f) | ((*cs_pulse & 0x100) >> 2); -} - -static unsigned long calc_mck_cycles(unsigned long ns, unsigned long mck_hz) -{ - unsigned long mul; - - /* - * cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] = - * x * (f / 1_000_000_000) = - * x * ((f * 65536) / 1_000_000_000) / 65536 = - * x * (((f / 10_000) * 65536) / 100_000) / 65536 = - */ - - mul = (mck_hz / 10000) << 16; - mul /= 100000; - - return (ns * mul + 65536) >> 16; /* rounding */ -} - -/** - * set_smc_timing - SMC timings setup. - * @dev: device - * @info: AT91 IDE info - * @ata: ATA timings - * - * Its assumed that write timings are same as read timings, - * cs_setup = 0 and cs_pulse = cycle. - */ -static void set_smc_timing(struct device *dev, struct ata_device *adev, - struct at91_ide_info *info, const struct ata_timing *ata) -{ - int ret = 0; - int use_iordy; - unsigned int t6z; /* data tristate time in ns */ - unsigned int cycle; /* SMC Cycle width in MCK ticks */ - unsigned int setup; /* SMC Setup width in MCK ticks */ - unsigned int pulse; /* CFIOR and CFIOW pulse width in MCK ticks */ - unsigned int cs_pulse; /* CS4 or CS5 pulse width in MCK ticks*/ - unsigned int tdf_cycles; /* SMC TDF MCK ticks */ - unsigned long mck_hz; /* MCK frequency in Hz */ - - t6z = (ata->mode < XFER_PIO_5) ? 30 : 20; - mck_hz = clk_get_rate(info->mck); - cycle = calc_mck_cycles(ata->cyc8b, mck_hz); - setup = calc_mck_cycles(ata->setup, mck_hz); - pulse = calc_mck_cycles(ata->act8b, mck_hz); - tdf_cycles = calc_mck_cycles(t6z, mck_hz); - - do { - ret = calc_smc_vals(dev, &setup, &pulse, &cycle, &cs_pulse); - } while (ret == -ER_SMC_RECALC); - - if (ret == -ER_SMC_CALC) - dev_err(dev, "Interface may not operate correctly\n"); - - dev_dbg(dev, "SMC Setup=%u, Pulse=%u, Cycle=%u, CS Pulse=%u\n", - setup, pulse, cycle, cs_pulse); - to_smc_format(&setup, &pulse, &cycle, &cs_pulse); - /* disable or enable waiting for IORDY signal */ - use_iordy = ata_pio_need_iordy(adev); - if (use_iordy) - info->mode |= AT91_SMC_EXNWMODE_READY; - - if (tdf_cycles > 15) { - tdf_cycles = 15; - dev_warn(dev, "maximal SMC TDF Cycles value\n"); - } - - dev_dbg(dev, "Use IORDY=%u, TDF Cycles=%u\n", use_iordy, tdf_cycles); - - regmap_fields_write(fields.setup, info->cs, - AT91SAM9_SMC_NRDSETUP(setup) | - AT91SAM9_SMC_NWESETUP(setup) | - AT91SAM9_SMC_NCS_NRDSETUP(0) | - AT91SAM9_SMC_NCS_WRSETUP(0)); - regmap_fields_write(fields.pulse, info->cs, - AT91SAM9_SMC_NRDPULSE(pulse) | - AT91SAM9_SMC_NWEPULSE(pulse) | - AT91SAM9_SMC_NCS_NRDPULSE(cs_pulse) | - AT91SAM9_SMC_NCS_WRPULSE(cs_pulse)); - regmap_fields_write(fields.cycle, info->cs, - AT91SAM9_SMC_NRDCYCLE(cycle) | - AT91SAM9_SMC_NWECYCLE(cycle)); - regmap_fields_write(fields.mode, info->cs, info->mode | - AT91_SMC_TDF_(tdf_cycles)); -} - -static void pata_at91_set_piomode(struct ata_port *ap, struct ata_device *adev) -{ - struct at91_ide_info *info = ap->host->private_data; - struct ata_timing timing; - int ret; - - /* Compute ATA timing and set it to SMC */ - ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0); - if (ret) { - dev_warn(ap->dev, "Failed to compute ATA timing %d, " - "set PIO_0 timing\n", ret); - timing = *ata_timing_find_mode(XFER_PIO_0); - } - set_smc_timing(ap->dev, adev, info, &timing); -} - -static unsigned int pata_at91_data_xfer_noirq(struct ata_queued_cmd *qc, - unsigned char *buf, unsigned int buflen, int rw) -{ - struct at91_ide_info *info = qc->dev->link->ap->host->private_data; - unsigned int consumed; - unsigned int mode; - unsigned long flags; - - local_irq_save(flags); - regmap_fields_read(fields.mode, info->cs, &mode); - - /* set 16bit mode before writing data */ - regmap_fields_write(fields.mode, info->cs, (mode & ~AT91_SMC_DBW) | - AT91_SMC_DBW_16); - - consumed = ata_sff_data_xfer(qc, buf, buflen, rw); - - /* restore 8bit mode after data is written */ - regmap_fields_write(fields.mode, info->cs, (mode & ~AT91_SMC_DBW) | - AT91_SMC_DBW_8); - - local_irq_restore(flags); - return consumed; -} - -static struct scsi_host_template pata_at91_sht = { - ATA_PIO_SHT(DRV_NAME), -}; - -static struct ata_port_operations pata_at91_port_ops = { - .inherits = &ata_sff_port_ops, - - .sff_data_xfer = pata_at91_data_xfer_noirq, - .set_piomode = pata_at91_set_piomode, - .cable_detect = ata_cable_40wire, -}; - -static int at91sam9_smc_fields_init(struct device *dev) -{ - struct reg_field field = REG_FIELD(0, 0, 31); - - field.id_size = 8; - field.id_offset = AT91SAM9_SMC_GENERIC_BLK_SZ; - - field.reg = AT91SAM9_SMC_SETUP(AT91SAM9_SMC_GENERIC); - fields.setup = devm_regmap_field_alloc(dev, smc, field); - if (IS_ERR(fields.setup)) - return PTR_ERR(fields.setup); - - field.reg = AT91SAM9_SMC_PULSE(AT91SAM9_SMC_GENERIC); - fields.pulse = devm_regmap_field_alloc(dev, smc, field); - if (IS_ERR(fields.pulse)) - return PTR_ERR(fields.pulse); - - field.reg = AT91SAM9_SMC_CYCLE(AT91SAM9_SMC_GENERIC); - fields.cycle = devm_regmap_field_alloc(dev, smc, field); - if (IS_ERR(fields.cycle)) - return PTR_ERR(fields.cycle); - - field.reg = AT91SAM9_SMC_MODE(AT91SAM9_SMC_GENERIC); - fields.mode = devm_regmap_field_alloc(dev, smc, field); - - return PTR_ERR_OR_ZERO(fields.mode); -} - -static int pata_at91_probe(struct platform_device *pdev) -{ - struct at91_cf_data *board = dev_get_platdata(&pdev->dev); - struct device *dev = &pdev->dev; - struct at91_ide_info *info; - struct resource *mem_res; - struct ata_host *host; - struct ata_port *ap; - - int irq_flags = 0; - int irq = 0; - int ret; - - /* get platform resources: IO/CTL memories and irq/rst pins */ - - if (pdev->num_resources != 1) { - dev_err(&pdev->dev, "invalid number of resources\n"); - return -EINVAL; - } - - mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - if (!mem_res) { - dev_err(dev, "failed to get mem resource\n"); - return -EINVAL; - } - - irq = board->irq_pin; - - smc = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "atmel,smc"); - if (IS_ERR(smc)) - return PTR_ERR(smc); - - ret = at91sam9_smc_fields_init(dev); - if (ret < 0) - return ret; - - /* init ata host */ - - host = ata_host_alloc(dev, 1); - - if (!host) - return -ENOMEM; - - ap = host->ports[0]; - ap->ops = &pata_at91_port_ops; - ap->flags |= ATA_FLAG_SLAVE_POSS; - ap->pio_mask = ATA_PIO4; - - if (!gpio_is_valid(irq)) { - ap->flags |= ATA_FLAG_PIO_POLLING; - ata_port_desc(ap, "no IRQ, using PIO polling"); - } - - info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); - - if (!info) { - dev_err(dev, "failed to allocate memory for private data\n"); - return -ENOMEM; - } - - info->mck = clk_get(NULL, "mck"); - - if (IS_ERR(info->mck)) { - dev_err(dev, "failed to get access to mck clock\n"); - return -ENODEV; - } - - info->cs = board->chipselect; - info->mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | - AT91_SMC_EXNWMODE_READY | AT91_SMC_BAT_SELECT | - AT91_SMC_DBW_8 | AT91_SMC_TDF_(0); - - info->ide_addr = devm_ioremap(dev, - mem_res->start + CF_IDE_OFFSET, CF_IDE_RES_SIZE); - - if (!info->ide_addr) { - dev_err(dev, "failed to map IO base\n"); - ret = -ENOMEM; - goto err_put; - } - - info->alt_addr = devm_ioremap(dev, - mem_res->start + CF_ALT_IDE_OFFSET, CF_IDE_RES_SIZE); - - if (!info->alt_addr) { - dev_err(dev, "failed to map CTL base\n"); - ret = -ENOMEM; - goto err_put; - } - - ap->ioaddr.cmd_addr = info->ide_addr; - ap->ioaddr.ctl_addr = info->alt_addr + 0x06; - ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; - - ata_sff_std_ports(&ap->ioaddr); - - ata_port_desc(ap, "mmio cmd 0x%llx ctl 0x%llx", - (unsigned long long)mem_res->start + CF_IDE_OFFSET, - (unsigned long long)mem_res->start + CF_ALT_IDE_OFFSET); - - host->private_data = info; - - ret = ata_host_activate(host, gpio_is_valid(irq) ? gpio_to_irq(irq) : 0, - gpio_is_valid(irq) ? ata_sff_interrupt : NULL, - irq_flags, &pata_at91_sht); - if (ret) - goto err_put; - - return 0; - -err_put: - clk_put(info->mck); - return ret; -} - -static int pata_at91_remove(struct platform_device *pdev) -{ - struct ata_host *host = platform_get_drvdata(pdev); - struct at91_ide_info *info; - - if (!host) - return 0; - info = host->private_data; - - ata_host_detach(host); - - if (!info) - return 0; - - clk_put(info->mck); - - return 0; -} - -static struct platform_driver pata_at91_driver = { - .probe = pata_at91_probe, - .remove = pata_at91_remove, - .driver = { - .name = DRV_NAME, - }, -}; - -module_platform_driver(pata_at91_driver); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Driver for CF in True IDE mode on AT91SAM9260 SoC"); -MODULE_AUTHOR("Matyukevich Sergey"); -MODULE_VERSION(DRV_VERSION); - |