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28#include <linux/ioport.h>
29#include <linux/module.h>
30#include <linux/kernel.h>
31#include <linux/gpio/driver.h>
32#include <linux/pci.h>
33#include <linux/spinlock.h>
34
35#define PMBASE_OFFSET 0xb0
36#define PMBASE_SIZE 0x30
37
38#define AMD_REG_GPIO(i) (0x10 + (i))
39
40#define AMD_GPIO_LTCH_STS 0x40
41#define AMD_GPIO_RTIN 0x20
42#define AMD_GPIO_DEBOUNCE 0x10
43#define AMD_GPIO_MODE_MASK 0x0c
44#define AMD_GPIO_MODE_IN 0x00
45#define AMD_GPIO_MODE_OUT 0x04
46
47#define AMD_GPIO_MODE_ALTFN 0x08
48#define AMD_GPIO_X_MASK 0x03
49#define AMD_GPIO_X_IN_ACTIVEHI 0x01
50#define AMD_GPIO_X_IN_LATCH 0x02
51#define AMD_GPIO_X_OUT_LOW 0x00
52#define AMD_GPIO_X_OUT_HI 0x01
53#define AMD_GPIO_X_OUT_CLK0 0x02
54#define AMD_GPIO_X_OUT_CLK1 0x03
55
56
57
58
59
60
61
62
63
64static const struct pci_device_id pci_tbl[] = {
65 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), 0 },
66 { 0, },
67};
68MODULE_DEVICE_TABLE(pci, pci_tbl);
69
70struct amd_gpio {
71 struct gpio_chip chip;
72 u32 pmbase;
73 void __iomem *pm;
74 struct pci_dev *pdev;
75 spinlock_t lock;
76 u8 orig[32];
77};
78
79static int amd_gpio_request(struct gpio_chip *chip, unsigned offset)
80{
81 struct amd_gpio *agp = gpiochip_get_data(chip);
82
83 agp->orig[offset] = ioread8(agp->pm + AMD_REG_GPIO(offset)) &
84 (AMD_GPIO_DEBOUNCE | AMD_GPIO_MODE_MASK | AMD_GPIO_X_MASK);
85
86 dev_dbg(&agp->pdev->dev, "Requested gpio %d, data %x\n", offset, agp->orig[offset]);
87
88 return 0;
89}
90
91static void amd_gpio_free(struct gpio_chip *chip, unsigned offset)
92{
93 struct amd_gpio *agp = gpiochip_get_data(chip);
94
95 dev_dbg(&agp->pdev->dev, "Freed gpio %d, data %x\n", offset, agp->orig[offset]);
96
97 iowrite8(agp->orig[offset], agp->pm + AMD_REG_GPIO(offset));
98}
99
100static void amd_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
101{
102 struct amd_gpio *agp = gpiochip_get_data(chip);
103 u8 temp;
104 unsigned long flags;
105
106 spin_lock_irqsave(&agp->lock, flags);
107 temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
108 temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_OUT | (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
109 iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
110 spin_unlock_irqrestore(&agp->lock, flags);
111
112 dev_dbg(&agp->pdev->dev, "Setting gpio %d, value %d, reg=%02x\n", offset, !!value, temp);
113}
114
115static int amd_gpio_get(struct gpio_chip *chip, unsigned offset)
116{
117 struct amd_gpio *agp = gpiochip_get_data(chip);
118 u8 temp;
119
120 temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
121
122 dev_dbg(&agp->pdev->dev, "Getting gpio %d, reg=%02x\n", offset, temp);
123
124 return (temp & AMD_GPIO_RTIN) ? 1 : 0;
125}
126
127static int amd_gpio_dirout(struct gpio_chip *chip, unsigned offset, int value)
128{
129 struct amd_gpio *agp = gpiochip_get_data(chip);
130 u8 temp;
131 unsigned long flags;
132
133 spin_lock_irqsave(&agp->lock, flags);
134 temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
135 temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_OUT | (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
136 iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
137 spin_unlock_irqrestore(&agp->lock, flags);
138
139 dev_dbg(&agp->pdev->dev, "Dirout gpio %d, value %d, reg=%02x\n", offset, !!value, temp);
140
141 return 0;
142}
143
144static int amd_gpio_dirin(struct gpio_chip *chip, unsigned offset)
145{
146 struct amd_gpio *agp = gpiochip_get_data(chip);
147 u8 temp;
148 unsigned long flags;
149
150 spin_lock_irqsave(&agp->lock, flags);
151 temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
152 temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_IN;
153 iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
154 spin_unlock_irqrestore(&agp->lock, flags);
155
156 dev_dbg(&agp->pdev->dev, "Dirin gpio %d, reg=%02x\n", offset, temp);
157
158 return 0;
159}
160
161static struct amd_gpio gp = {
162 .chip = {
163 .label = "AMD GPIO",
164 .owner = THIS_MODULE,
165 .base = -1,
166 .ngpio = 32,
167 .request = amd_gpio_request,
168 .free = amd_gpio_free,
169 .set = amd_gpio_set,
170 .get = amd_gpio_get,
171 .direction_output = amd_gpio_dirout,
172 .direction_input = amd_gpio_dirin,
173 },
174};
175
176static int __init amd_gpio_init(void)
177{
178 int err = -ENODEV;
179 struct pci_dev *pdev = NULL;
180 const struct pci_device_id *ent;
181
182
183
184
185
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189
190
191
192 for_each_pci_dev(pdev) {
193 ent = pci_match_id(pci_tbl, pdev);
194 if (ent)
195 goto found;
196 }
197
198 goto out;
199
200found:
201 err = pci_read_config_dword(pdev, 0x58, &gp.pmbase);
202 if (err)
203 goto out;
204 err = -EIO;
205 gp.pmbase &= 0x0000FF00;
206 if (gp.pmbase == 0)
207 goto out;
208 if (!devm_request_region(&pdev->dev, gp.pmbase + PMBASE_OFFSET,
209 PMBASE_SIZE, "AMD GPIO")) {
210 dev_err(&pdev->dev, "AMD GPIO region 0x%x already in use!\n",
211 gp.pmbase + PMBASE_OFFSET);
212 err = -EBUSY;
213 goto out;
214 }
215 gp.pm = ioport_map(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
216 if (!gp.pm) {
217 dev_err(&pdev->dev, "Couldn't map io port into io memory\n");
218 err = -ENOMEM;
219 goto out;
220 }
221 gp.pdev = pdev;
222 gp.chip.parent = &pdev->dev;
223
224 spin_lock_init(&gp.lock);
225
226 printk(KERN_INFO "AMD-8111 GPIO detected\n");
227 err = gpiochip_add_data(&gp.chip, &gp);
228 if (err) {
229 printk(KERN_ERR "GPIO registering failed (%d)\n",
230 err);
231 ioport_unmap(gp.pm);
232 goto out;
233 }
234out:
235 return err;
236}
237
238static void __exit amd_gpio_exit(void)
239{
240 gpiochip_remove(&gp.chip);
241 ioport_unmap(gp.pm);
242}
243
244module_init(amd_gpio_init);
245module_exit(amd_gpio_exit);
246
247MODULE_AUTHOR("The Linux Kernel team");
248MODULE_DESCRIPTION("GPIO driver for AMD chipsets");
249MODULE_LICENSE("GPL");
250
