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(desc: info->gpio_line)) { |
60 | irq_set_irq_type(irq: info->irq, type: IRQ_TYPE_LEVEL_LOW); |
61 | ata_sff_interrupt(irq: info->irq, dev_instance); |
62 | } else { |
63 | irq_set_irq_type(irq: info->irq, type: 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(ioaddr: &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(dev: &pdev->dev, NULL, flags: GPIOD_IN); |
124 | if (IS_ERR(ptr: gpiod)) { |
125 | dev_err(&pdev->dev, "no GPIO found for irq%d\n" , irq); |
126 | return PTR_ERR(ptr: gpiod); |
127 | } |
128 | gpiod_set_consumer_name(desc: gpiod, DRV_NAME); |
129 | |
130 | /* allocate host */ |
131 | ah = ata_host_alloc(dev: &pdev->dev, RB500_CF_MAXPORTS); |
132 | if (!ah) |
133 | return -ENOMEM; |
134 | |
135 | info = devm_kzalloc(dev: &pdev->dev, size: 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(dev: &pdev->dev, offset: res->start, |
144 | size: resource_size(res)); |
145 | if (!info->iobase) |
146 | return -ENOMEM; |
147 | |
148 | rb532_pata_setup_ports(ah); |
149 | |
150 | ret = ata_host_activate(host: ah, irq, irq_handler: rb532_pata_irq_handler, |
151 | IRQF_TRIGGER_LOW, sht: &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(host: ah); |
163 | } |
164 | |
165 | static struct platform_driver rb532_pata_platform_driver = { |
166 | .probe = rb532_pata_driver_probe, |
167 | .remove_new = 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 | |