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From 92b24777385cd8388e0fa8b9f1d24e5bc4466641 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sat, 13 Aug 2011 13:59:50 +0200
Subject: [PATCH 12/22] MIPS: lantiq: make GPIO3 work on AR9
There are 3 16bit and 1 8bit gpio ports on AR9. The gpio driver needs a hack
at 2 places to make the different register layout of the GPIO3 work properly
with the driver. Before only GPIO0-2 were supported. As the GPIO number scheme
clashes with the new size, we also move the other gpio chips to new offsets.
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
---
.../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 2 +
arch/mips/lantiq/xway/devices.c | 3 +
arch/mips/lantiq/xway/gpio.c | 62 ++++++++++++++++----
arch/mips/lantiq/xway/gpio_ebu.c | 3 +-
arch/mips/lantiq/xway/gpio_stp.c | 3 +-
5 files changed, 57 insertions(+), 16 deletions(-)
--- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
@@ -121,7 +121,9 @@
#define LTQ_GPIO0_BASE_ADDR 0x1E100B10
#define LTQ_GPIO1_BASE_ADDR 0x1E100B40
#define LTQ_GPIO2_BASE_ADDR 0x1E100B70
+#define LTQ_GPIO3_BASE_ADDR 0x1E100BA0
#define LTQ_GPIO_SIZE 0x30
+#define LTQ_GPIO3_SIZE 0x10
/* SSC */
#define LTQ_SSC_BASE_ADDR 0x1e100800
--- a/arch/mips/lantiq/xway/devices.c
+++ b/arch/mips/lantiq/xway/devices.c
@@ -34,6 +34,7 @@ static struct resource ltq_gpio_resource
MEM_RES("gpio0", LTQ_GPIO0_BASE_ADDR, LTQ_GPIO_SIZE),
MEM_RES("gpio1", LTQ_GPIO1_BASE_ADDR, LTQ_GPIO_SIZE),
MEM_RES("gpio2", LTQ_GPIO2_BASE_ADDR, LTQ_GPIO_SIZE),
+ MEM_RES("gpio3", LTQ_GPIO3_BASE_ADDR, LTQ_GPIO3_SIZE),
};
void __init ltq_register_gpio(void)
@@ -47,6 +48,8 @@ void __init ltq_register_gpio(void)
if (ltq_is_ar9() || ltq_is_vr9()) {
platform_device_register_simple("ltq_gpio", 2,
<q_gpio_resource[2], 1);
+ platform_device_register_simple("ltq_gpio", 3,
+ <q_gpio_resource[3], 1);
}
}
--- a/arch/mips/lantiq/xway/gpio.c
+++ b/arch/mips/lantiq/xway/gpio.c
@@ -23,9 +23,15 @@
#define LTQ_GPIO_OD 0x14
#define LTQ_GPIO_PUDSEL 0x1C
#define LTQ_GPIO_PUDEN 0x20
+#define LTQ_GPIO3_OD 0x24
+#define LTQ_GPIO3_ALTSEL1 0x24
+/* PORT3 only has 8 pins and its register layout
+ is slightly different */
#define PINS_PER_PORT 16
-#define MAX_PORTS 3
+#define PINS_PORT3 8
+#define MAX_PORTS 4
+#define MAX_PIN 56
#define ltq_gpio_getbit(m, r, p) (!!(ltq_r32(m + r) & (1 << p)))
#define ltq_gpio_setbit(m, r, p) ltq_w32_mask(0, (1 << p), m + r)
@@ -55,7 +61,7 @@ int ltq_gpio_request(unsigned int pin, u
{
int id = 0;
- if (pin >= (MAX_PORTS * PINS_PER_PORT))
+ if (pin >= MAX_PIN)
return -EINVAL;
if (gpio_request(pin, name)) {
pr_err("failed to setup lantiq gpio: %s\n", name);
@@ -75,12 +81,21 @@ int ltq_gpio_request(unsigned int pin, u
else
ltq_gpio_clearbit(ltq_gpio_port[id].membase,
LTQ_GPIO_ALTSEL0, pin);
- if (alt1)
- ltq_gpio_setbit(ltq_gpio_port[id].membase,
- LTQ_GPIO_ALTSEL1, pin);
- else
- ltq_gpio_clearbit(ltq_gpio_port[id].membase,
- LTQ_GPIO_ALTSEL1, pin);
+ if (id == 3) {
+ if (alt1)
+ ltq_gpio_setbit(ltq_gpio_port[1].membase,
+ LTQ_GPIO3_ALTSEL1, pin);
+ else
+ ltq_gpio_clearbit(ltq_gpio_port[1].membase,
+ LTQ_GPIO3_ALTSEL1, pin);
+ } else {
+ if (alt1)
+ ltq_gpio_setbit(ltq_gpio_port[id].membase,
+ LTQ_GPIO_ALTSEL1, pin);
+ else
+ ltq_gpio_clearbit(ltq_gpio_port[id].membase,
+ LTQ_GPIO_ALTSEL1, pin);
+ }
return 0;
}
EXPORT_SYMBOL(ltq_gpio_request);
@@ -106,7 +121,11 @@ static int ltq_gpio_direction_input(stru
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
- ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
+ if (chip->ngpio == PINS_PORT3)
+ ltq_gpio_clearbit(ltq_gpio_port[0].membase,
+ LTQ_GPIO3_OD, offset);
+ else
+ ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_PUDSEL, offset);
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_PUDEN, offset);
@@ -119,7 +138,10 @@ static int ltq_gpio_direction_output(str
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
- ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
+ if (chip->ngpio == PINS_PORT3)
+ ltq_gpio_setbit(ltq_gpio_port[0].membase, LTQ_GPIO3_OD, offset);
+ else
+ ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_PUDSEL, offset);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_PUDEN, offset);
@@ -133,7 +155,11 @@ static int ltq_gpio_req(struct gpio_chip
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL0, offset);
- ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL1, offset);
+ if (chip->ngpio == PINS_PORT3)
+ ltq_gpio_clearbit(ltq_gpio_port[1].membase,
+ LTQ_GPIO3_ALTSEL1, offset);
+ else
+ ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL1, offset);
return 0;
}
@@ -146,6 +172,15 @@ static int ltq_gpio_probe(struct platfor
pdev->id);
return -EINVAL;
}
+
+ /* dirty hack - The registers of port3 are not mapped linearly.
+ Port 3 may only load if Port 1/2 are mapped */
+ if ((pdev->id == 3) && (!ltq_gpio_port[1].membase || !ltq_gpio_port[2].membase)) {
+ dev_err(&pdev->dev,
+ "ports 1/2 need to be loaded before port 3 works\n");
+ return -ENOMEM;
+ }
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get memory for gpio port %d\n",
@@ -175,7 +210,10 @@ static int ltq_gpio_probe(struct platfor
ltq_gpio_port[pdev->id].chip.set = ltq_gpio_set;
ltq_gpio_port[pdev->id].chip.request = ltq_gpio_req;
ltq_gpio_port[pdev->id].chip.base = PINS_PER_PORT * pdev->id;
- ltq_gpio_port[pdev->id].chip.ngpio = PINS_PER_PORT;
+ if (pdev->id == 3)
+ ltq_gpio_port[pdev->id].chip.ngpio = PINS_PORT3;
+ else
+ ltq_gpio_port[pdev->id].chip.ngpio = PINS_PER_PORT;
platform_set_drvdata(pdev, <q_gpio_port[pdev->id]);
return gpiochip_add(<q_gpio_port[pdev->id].chip);
}
--- a/arch/mips/lantiq/xway/gpio_ebu.c
+++ b/arch/mips/lantiq/xway/gpio_ebu.c
@@ -61,9 +61,8 @@ static struct gpio_chip ltq_ebu_chip = {
.label = "ltq_ebu",
.direction_output = ltq_ebu_direction_output,
.set = ltq_ebu_set,
- .base = 72,
+ .base = 100,
.ngpio = 16,
- .can_sleep = 1,
.owner = THIS_MODULE,
};
--- a/arch/mips/lantiq/xway/gpio_stp.c
+++ b/arch/mips/lantiq/xway/gpio_stp.c
@@ -72,9 +72,8 @@ static struct gpio_chip ltq_stp_chip = {
.label = "ltq_stp",
.direction_output = ltq_stp_direction_output,
.set = ltq_stp_set,
- .base = 48,
+ .base = 200,
.ngpio = 24,
- .can_sleep = 1,
.owner = THIS_MODULE,
};
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