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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3db691da FF |
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. | |
3db691da FF |
16 | */ |
17 | ||
5a0e3ad6 | 18 | #include <linux/gfp.h> |
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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> | |
cd56f35e | 26 | #include <linux/gpio/consumer.h> |
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27 | |
28 | #include <linux/libata.h> | |
29 | #include <scsi/scsi_host.h> | |
30 | ||
01836176 GJ |
31 | #include <asm/mach-rc32434/rb.h> |
32 | ||
3dd654bf | 33 | #define DRV_NAME "pata-rb532-cf" |
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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 | ||
9f14786e PS |
40 | #define RB500_CF_REG_BASE 0x0800 |
41 | #define RB500_CF_REG_ERR 0x080D | |
3db691da | 42 | #define RB500_CF_REG_CTRL 0x080E |
9f14786e PS |
43 | /* 32bit buffered data register offset */ |
44 | #define RB500_CF_REG_DBUF32 0x0C00 | |
3db691da | 45 | |
3dd654bf | 46 | struct rb532_cf_info { |
3db691da | 47 | void __iomem *iobase; |
cd56f35e | 48 | struct gpio_desc *gpio_line; |
3db691da FF |
49 | unsigned int irq; |
50 | }; | |
51 | ||
52 | /* ------------------------------------------------------------------------ */ | |
53 | ||
3dd654bf | 54 | static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) |
3db691da FF |
55 | { |
56 | struct ata_host *ah = dev_instance; | |
3dd654bf | 57 | struct rb532_cf_info *info = ah->private_data; |
3db691da | 58 | |
cd56f35e | 59 | if (gpiod_get_value(info->gpio_line)) { |
dced35ae | 60 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); |
6be976e7 | 61 | ata_sff_interrupt(info->irq, dev_instance); |
3db691da | 62 | } else { |
dced35ae | 63 | irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); |
3db691da FF |
64 | } |
65 | ||
66 | return IRQ_HANDLED; | |
67 | } | |
68 | ||
3dd654bf | 69 | static struct ata_port_operations rb532_pata_port_ops = { |
029cfd6b | 70 | .inherits = &ata_sff_port_ops, |
180bd147 | 71 | .sff_data_xfer = ata_sff_data_xfer32, |
3db691da FF |
72 | }; |
73 | ||
74 | /* ------------------------------------------------------------------------ */ | |
75 | ||
3dd654bf | 76 | static struct scsi_host_template rb532_pata_sht = { |
68d1d07b | 77 | ATA_PIO_SHT(DRV_NAME), |
3db691da FF |
78 | }; |
79 | ||
80 | /* ------------------------------------------------------------------------ */ | |
81 | ||
3dd654bf | 82 | static void rb532_pata_setup_ports(struct ata_host *ah) |
3db691da | 83 | { |
3dd654bf | 84 | struct rb532_cf_info *info = ah->private_data; |
3db691da FF |
85 | struct ata_port *ap; |
86 | ||
87 | ap = ah->ports[0]; | |
88 | ||
3dd654bf | 89 | ap->ops = &rb532_pata_port_ops; |
14bdef98 | 90 | ap->pio_mask = ATA_PIO4; |
3db691da | 91 | |
9f14786e | 92 | ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; |
3db691da FF |
93 | ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; |
94 | ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; | |
95 | ||
9363c382 | 96 | ata_sff_std_ports(&ap->ioaddr); |
3db691da | 97 | |
9f14786e PS |
98 | ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; |
99 | ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; | |
3db691da FF |
100 | } |
101 | ||
0ec24914 | 102 | static int rb532_pata_driver_probe(struct platform_device *pdev) |
3db691da | 103 | { |
9223d01b | 104 | int irq; |
cd56f35e | 105 | struct gpio_desc *gpiod; |
3db691da FF |
106 | struct resource *res; |
107 | struct ata_host *ah; | |
3dd654bf | 108 | struct rb532_cf_info *info; |
3db691da FF |
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 | dev_err(&pdev->dev, "no IRQ resource found\n"); | |
120 | return -ENOENT; | |
121 | } | |
122 | ||
cd56f35e LW |
123 | gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN); |
124 | if (IS_ERR(gpiod)) { | |
3db691da | 125 | dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); |
cd56f35e | 126 | return PTR_ERR(gpiod); |
3db691da | 127 | } |
cd56f35e | 128 | gpiod_set_consumer_name(gpiod, DRV_NAME); |
3db691da FF |
129 | |
130 | /* allocate host */ | |
131 | ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); | |
132 | if (!ah) | |
133 | return -ENOMEM; | |
134 | ||
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135 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
136 | if (!info) | |
137 | return -ENOMEM; | |
138 | ||
139 | ah->private_data = info; | |
cd56f35e | 140 | info->gpio_line = gpiod; |
3db691da FF |
141 | info->irq = irq; |
142 | ||
4bdc0d67 | 143 | info->iobase = devm_ioremap(&pdev->dev, res->start, |
041b5eac | 144 | resource_size(res)); |
3db691da FF |
145 | if (!info->iobase) |
146 | return -ENOMEM; | |
147 | ||
3dd654bf | 148 | rb532_pata_setup_ports(ah); |
3db691da | 149 | |
3dd654bf RB |
150 | ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, |
151 | IRQF_TRIGGER_LOW, &rb532_pata_sht); | |
3db691da | 152 | if (ret) |
cd56f35e | 153 | return ret; |
3db691da FF |
154 | |
155 | return 0; | |
3db691da FF |
156 | } |
157 | ||
0ec24914 | 158 | static int rb532_pata_driver_remove(struct platform_device *pdev) |
3db691da FF |
159 | { |
160 | struct ata_host *ah = platform_get_drvdata(pdev); | |
3db691da FF |
161 | |
162 | ata_host_detach(ah); | |
3db691da FF |
163 | |
164 | return 0; | |
165 | } | |
166 | ||
3dd654bf RB |
167 | static struct platform_driver rb532_pata_platform_driver = { |
168 | .probe = rb532_pata_driver_probe, | |
0ec24914 | 169 | .remove = rb532_pata_driver_remove, |
3db691da FF |
170 | .driver = { |
171 | .name = DRV_NAME, | |
3db691da FF |
172 | }, |
173 | }; | |
174 | ||
3db691da FF |
175 | #define DRV_INFO DRV_DESC " version " DRV_VERSION |
176 | ||
99c8ea3e | 177 | module_platform_driver(rb532_pata_platform_driver); |
3db691da FF |
178 | |
179 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); | |
180 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
181 | MODULE_DESCRIPTION(DRV_DESC); | |
182 | MODULE_VERSION(DRV_VERSION); | |
183 | MODULE_LICENSE("GPL"); | |
99c8ea3e | 184 | MODULE_ALIAS("platform:" DRV_NAME); |