2 * Copyright (c) 2012 The Chromium OS Authors.
3 * SPDX-License-Identifier: GPL-2.0+
17 #include <asm/arch/gpio.h>
18 #include <dt-bindings/gpio/x86-gpio.h>
20 DECLARE_GLOBAL_DATA_PTR
;
23 * struct broadwell_bank_priv - Private driver data
25 * @regs: Pointer to GPIO registers
26 * @bank: Bank number for this bank (0, 1 or 2)
27 * @offset: GPIO offset for this bank (0, 32 or 64)
29 struct broadwell_bank_priv
{
30 struct pch_lp_gpio_regs
*regs
;
35 static int broadwell_gpio_request(struct udevice
*dev
, unsigned offset
,
38 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
39 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
43 * Make sure that the GPIO pin we want isn't already in use for some
44 * built-in hardware function. We have to check this for every
47 debug("%s: request bank %d offset %d: ", __func__
, priv
->bank
, offset
);
48 val
= inl(®s
->own
[priv
->bank
]);
49 if (!(val
& (1UL << offset
))) {
50 debug("gpio is reserved for internal use\n");
58 static int broadwell_gpio_direction_input(struct udevice
*dev
, unsigned offset
)
60 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
61 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
63 setio_32(®s
->config
[priv
->offset
+ offset
], CONFA_DIR_INPUT
);
68 static int broadwell_gpio_get_value(struct udevice
*dev
, unsigned offset
)
70 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
71 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
73 return inl(®s
->config
[priv
->offset
+ offset
]) & CONFA_LEVEL_HIGH
?
77 static int broadwell_gpio_set_value(struct udevice
*dev
, unsigned offset
,
80 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
81 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
83 debug("%s: dev=%s, offset=%d, value=%d\n", __func__
, dev
->name
, offset
,
85 clrsetio_32(®s
->config
[priv
->offset
+ offset
], CONFA_OUTPUT_HIGH
,
86 value
? CONFA_OUTPUT_HIGH
: 0);
91 static int broadwell_gpio_direction_output(struct udevice
*dev
, unsigned offset
,
94 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
95 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
97 broadwell_gpio_set_value(dev
, offset
, value
);
98 clrio_32(®s
->config
[priv
->offset
+ offset
], CONFA_DIR_INPUT
);
103 static int broadwell_gpio_get_function(struct udevice
*dev
, unsigned offset
)
105 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
106 struct pch_lp_gpio_regs
*regs
= priv
->regs
;
107 u32 mask
= 1UL << offset
;
109 if (!(inl(®s
->own
[priv
->bank
]) & mask
))
111 if (inl(®s
->config
[priv
->offset
+ offset
]) & CONFA_DIR_INPUT
)
117 static int broadwell_gpio_probe(struct udevice
*dev
)
119 struct broadwell_bank_platdata
*plat
= dev_get_platdata(dev
);
120 struct gpio_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
121 struct broadwell_bank_priv
*priv
= dev_get_priv(dev
);
122 struct udevice
*pinctrl
;
125 /* Set up pin control if available */
126 ret
= syscon_get_by_driver_data(X86_SYSCON_PINCONF
, &pinctrl
);
127 debug("%s, pinctrl=%p, ret=%d\n", __func__
, pinctrl
, ret
);
129 uc_priv
->gpio_count
= GPIO_PER_BANK
;
130 uc_priv
->bank_name
= plat
->bank_name
;
132 priv
->regs
= (struct pch_lp_gpio_regs
*)(uintptr_t)plat
->base_addr
;
133 priv
->bank
= plat
->bank
;
134 priv
->offset
= priv
->bank
* 32;
135 debug("%s: probe done, regs %p, bank %d\n", __func__
, priv
->regs
,
141 static int broadwell_gpio_ofdata_to_platdata(struct udevice
*dev
)
143 struct broadwell_bank_platdata
*plat
= dev_get_platdata(dev
);
148 ret
= pch_get_gpio_base(dev
->parent
, &gpiobase
);
152 bank
= fdtdec_get_int(gd
->fdt_blob
, dev_of_offset(dev
), "reg", -1);
154 debug("%s: Invalid bank number %d\n", __func__
, bank
);
158 plat
->base_addr
= gpiobase
;
159 plat
->bank_name
= fdt_getprop(gd
->fdt_blob
, dev_of_offset(dev
),
165 static const struct dm_gpio_ops gpio_broadwell_ops
= {
166 .request
= broadwell_gpio_request
,
167 .direction_input
= broadwell_gpio_direction_input
,
168 .direction_output
= broadwell_gpio_direction_output
,
169 .get_value
= broadwell_gpio_get_value
,
170 .set_value
= broadwell_gpio_set_value
,
171 .get_function
= broadwell_gpio_get_function
,
174 static const struct udevice_id intel_broadwell_gpio_ids
[] = {
175 { .compatible
= "intel,broadwell-gpio" },
179 U_BOOT_DRIVER(gpio_broadwell
) = {
180 .name
= "gpio_broadwell",
182 .of_match
= intel_broadwell_gpio_ids
,
183 .ops
= &gpio_broadwell_ops
,
184 .ofdata_to_platdata
= broadwell_gpio_ofdata_to_platdata
,
185 .probe
= broadwell_gpio_probe
,
186 .priv_auto_alloc_size
= sizeof(struct broadwell_bank_priv
),
187 .platdata_auto_alloc_size
= sizeof(struct broadwell_bank_platdata
),