1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * A low-level PATA driver to handle a Compact Flash connected on the 4 * Mikrotik's RouterBoard 532 board. 5 * 6 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> 7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org> 8 * 9 * This file was based on: drivers/ata/pata_ixp4xx_cf.c 10 * Copyright (C) 2006-07 Tower Technologies 11 * Author: Alessandro Zummo <a.zummo@towertech.it> 12 * 13 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for 14 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code 15 * seems not to have a license. 16 */ 17 18 #include <linux/gfp.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 23 #include <linux/io.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/gpio/consumer.h> 27 28 #include <linux/libata.h> 29 #include <scsi/scsi_host.h> 30 31 #include <asm/mach-rc32434/rb.h> 32 33 #define DRV_NAME "pata-rb532-cf" 34 #define DRV_VERSION "0.1.0" 35 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" 36 37 #define RB500_CF_MAXPORTS 1 38 #define RB500_CF_IO_DELAY 400 39 40 #define RB500_CF_REG_BASE 0x0800 41 #define RB500_CF_REG_ERR 0x080D 42 #define RB500_CF_REG_CTRL 0x080E 43 /* 32bit buffered data register offset */ 44 #define RB500_CF_REG_DBUF32 0x0C00 45 46 struct rb532_cf_info { 47 void __iomem *iobase; 48 struct gpio_desc *gpio_line; 49 unsigned int irq; 50 }; 51 52 /* ------------------------------------------------------------------------ */ 53 54 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) 55 { 56 struct ata_host *ah = dev_instance; 57 struct rb532_cf_info *info = ah->private_data; 58 59 if (gpiod_get_value(info->gpio_line)) { 60 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 61 ata_sff_interrupt(info->irq, dev_instance); 62 } else { 63 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 64 } 65 66 return IRQ_HANDLED; 67 } 68 69 static struct ata_port_operations rb532_pata_port_ops = { 70 .inherits = &ata_sff_port_ops, 71 .sff_data_xfer = ata_sff_data_xfer32, 72 }; 73 74 /* ------------------------------------------------------------------------ */ 75 76 static const struct scsi_host_template rb532_pata_sht = { 77 ATA_PIO_SHT(DRV_NAME), 78 }; 79 80 /* ------------------------------------------------------------------------ */ 81 82 static void rb532_pata_setup_ports(struct ata_host *ah) 83 { 84 struct rb532_cf_info *info = ah->private_data; 85 struct ata_port *ap; 86 87 ap = ah->ports[0]; 88 89 ap->ops = &rb532_pata_port_ops; 90 ap->pio_mask = ATA_PIO4; 91 92 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; 93 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; 94 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; 95 96 ata_sff_std_ports(&ap->ioaddr); 97 98 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; 99 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; 100 } 101 102 static int rb532_pata_driver_probe(struct platform_device *pdev) 103 { 104 int irq; 105 struct gpio_desc *gpiod; 106 struct resource *res; 107 struct ata_host *ah; 108 struct rb532_cf_info *info; 109 int ret; 110 111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 112 if (!res) { 113 dev_err(&pdev->dev, "no IOMEM resource found\n"); 114 return -EINVAL; 115 } 116 117 irq = platform_get_irq(pdev, 0); 118 if (irq < 0) 119 return irq; 120 if (!irq) 121 return -EINVAL; 122 123 gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN); 124 if (IS_ERR(gpiod)) { 125 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 126 return PTR_ERR(gpiod); 127 } 128 gpiod_set_consumer_name(gpiod, DRV_NAME); 129 130 /* allocate host */ 131 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 132 if (!ah) 133 return -ENOMEM; 134 135 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 136 if (!info) 137 return -ENOMEM; 138 139 ah->private_data = info; 140 info->gpio_line = gpiod; 141 info->irq = irq; 142 143 info->iobase = devm_ioremap(&pdev->dev, res->start, 144 resource_size(res)); 145 if (!info->iobase) 146 return -ENOMEM; 147 148 rb532_pata_setup_ports(ah); 149 150 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 151 IRQF_TRIGGER_LOW, &rb532_pata_sht); 152 if (ret) 153 return ret; 154 155 return 0; 156 } 157 158 static void rb532_pata_driver_remove(struct platform_device *pdev) 159 { 160 struct ata_host *ah = platform_get_drvdata(pdev); 161 162 ata_host_detach(ah); 163 } 164 165 static struct platform_driver rb532_pata_platform_driver = { 166 .probe = rb532_pata_driver_probe, 167 .remove = rb532_pata_driver_remove, 168 .driver = { 169 .name = DRV_NAME, 170 }, 171 }; 172 173 #define DRV_INFO DRV_DESC " version " DRV_VERSION 174 175 module_platform_driver(rb532_pata_platform_driver); 176 177 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 178 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 179 MODULE_DESCRIPTION(DRV_DESC); 180 MODULE_VERSION(DRV_VERSION); 181 MODULE_LICENSE("GPL"); 182 MODULE_ALIAS("platform:" DRV_NAME); 183