summaryrefslogtreecommitdiff
path: root/src/soc/broadcom/cygnus/gpio.c
diff options
context:
space:
mode:
authorIcarus Chau <ichau@broadcom.com>2015-03-03 19:36:03 -0800
committerPatrick Georgi <pgeorgi@google.com>2015-04-22 08:57:18 +0200
commit985589592753b380c54300b38d6d3ec259c4a240 (patch)
tree21e038be7590eaa3d07bbf9516667ab2ef14fd17 /src/soc/broadcom/cygnus/gpio.c
parent82c706e8f0d8b0a5d412170849d45ff4d885655c (diff)
downloadcoreboot-985589592753b380c54300b38d6d3ec259c4a240.tar.xz
broadcom/cygnus: Enable gpio on romstage
BUG=chrome-os-partner:35936 BRANCH=broadcom-firmware TEST=When enable configuration CYGNUS_GPIO_TEST, print on console: Start gpio test... [gpio_crmu] gpio:0 set input [gpio_crmu] gpio:0 set pullup:0 GPIO get 170=0 gpio request enable pin=64 offset=0x1c .... GPIO set 69=1 [gpio_asiu] gpio:45 set, value:0 GPIO set 69=0 Gpio test completed... Additional test: Measure on GPIO 69 to confirm the voltage change. Apply voltage on AON_GPIO0 to check reading. Change-Id: I634cffccc7f0fa198317a92e3f1670ae6828892e Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 4784e5d88b9f7acb70bd6f6b12b1096f092f34b8 Original-Signed-off-by: Icarus Chau <ichau@broadcom.com> Original-Reviewed-on: https://chrome-internal-review.googlesource.com/204537 Original-Reviewed-by: Daisuke Nojiri <dnojiri@google.com> Original-Change-Id: Ia4f833be80d7844c2d014c9ffcf587d385e7766c Original-Reviewed-on: https://chromium-review.googlesource.com/263495 Original-Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org> Original-Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org> Original-Trybot-Ready: Daisuke Nojiri <dnojiri@chromium.org> Original-Tested-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: http://review.coreboot.org/9907 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/broadcom/cygnus/gpio.c')
-rw-r--r--src/soc/broadcom/cygnus/gpio.c501
1 files changed, 501 insertions, 0 deletions
diff --git a/src/soc/broadcom/cygnus/gpio.c b/src/soc/broadcom/cygnus/gpio.c
new file mode 100644
index 0000000000..9c4ef24079
--- /dev/null
+++ b/src/soc/broadcom/cygnus/gpio.c
@@ -0,0 +1,501 @@
+/*
+* Copyright (C) 2015 Broadcom Corporation
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License as
+* published by the Free Software Foundation version 2.
+*
+* This program is distributed "as is" WITHOUT ANY WARRANTY of any
+* kind, whether express or implied; without even the implied warranty
+* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*/
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <gpio.h>
+#include <stdlib.h>
+#include <delay.h>
+
+#define dev_dbg(chip, fmt, args...) printk(BIOS_DEBUG, "[%s] " fmt, \
+ chip->label, args)
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET 0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET 0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET 0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET 0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET 0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET 0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET 0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET 0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET 0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET 0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET 0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET 0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT 20
+#define GPIO_DRV_STRENGTH_BITS 3
+#define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl_priv: pointer to pinctrl handle
+ */
+struct cygnus_gpio {
+ void *base;
+ void *io_ctrl;
+ const char *label;
+ int gpio_base;
+ u16 ngpio;
+ unsigned num_banks;
+ int pinmux_is_supported;
+ void *pctl_priv;
+};
+
+/*
+ * GPIO cores table
+ *
+ * Cygnus has 3 gpio cores. The tables contains descriptors of those cores.
+ */
+struct cygnus_gpio cygnus_gpio_table[] = {
+ {
+ .base = (void *)0x03024800,
+ .io_ctrl = (void *)0x03024008,
+ .label = "gpio_crmu",
+ .gpio_base = 170,
+ .ngpio = 6,
+ },
+ {
+ .base = (void *)0x1800a000,
+ .io_ctrl = (void *)0x0301d164,
+ .label = "gpio_ccm",
+ .gpio_base = 0,
+ .ngpio = 24,
+ },
+ {
+ .base = (void *)0x180a5000,
+ .label = "gpio_asiu",
+ .gpio_base = 24,
+ .ngpio = 146,
+ .pinmux_is_supported = 1
+ }
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+ unsigned offset;
+ unsigned pin_base;
+ unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins.
+ * This is for ASIU gpio. The offset is based on ASIU gpios.
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+ CYGNUS_PINRANGE(0, 42, 1),
+ CYGNUS_PINRANGE(1, 44, 3),
+ CYGNUS_PINRANGE(4, 48, 1),
+ CYGNUS_PINRANGE(5, 50, 3),
+ CYGNUS_PINRANGE(8, 126, 1),
+ CYGNUS_PINRANGE(9, 155, 1),
+ CYGNUS_PINRANGE(10, 152, 1),
+ CYGNUS_PINRANGE(11, 154, 1),
+ CYGNUS_PINRANGE(12, 153, 1),
+ CYGNUS_PINRANGE(13, 127, 3),
+ CYGNUS_PINRANGE(16, 140, 1),
+ CYGNUS_PINRANGE(17, 145, 7),
+ CYGNUS_PINRANGE(24, 130, 10),
+ CYGNUS_PINRANGE(34, 141, 4),
+ CYGNUS_PINRANGE(38, 54, 1),
+ CYGNUS_PINRANGE(39, 56, 3),
+ CYGNUS_PINRANGE(42, 60, 3),
+ CYGNUS_PINRANGE(45, 64, 3),
+ CYGNUS_PINRANGE(48, 68, 2),
+ CYGNUS_PINRANGE(50, 84, 6),
+ CYGNUS_PINRANGE(56, 94, 6),
+ CYGNUS_PINRANGE(62, 72, 1),
+ CYGNUS_PINRANGE(63, 70, 1),
+ CYGNUS_PINRANGE(64, 80, 1),
+ CYGNUS_PINRANGE(65, 74, 3),
+ CYGNUS_PINRANGE(68, 78, 1),
+ CYGNUS_PINRANGE(69, 82, 1),
+ CYGNUS_PINRANGE(70, 156, 17),
+ CYGNUS_PINRANGE(87, 104, 12),
+ CYGNUS_PINRANGE(99, 102, 2),
+ CYGNUS_PINRANGE(101, 90, 4),
+ CYGNUS_PINRANGE(105, 116, 10),
+ CYGNUS_PINRANGE(123, 11, 1),
+ CYGNUS_PINRANGE(124, 38, 4),
+ CYGNUS_PINRANGE(128, 43, 1),
+ CYGNUS_PINRANGE(129, 47, 1),
+ CYGNUS_PINRANGE(130, 49, 1),
+ CYGNUS_PINRANGE(131, 53, 1),
+ CYGNUS_PINRANGE(132, 55, 1),
+ CYGNUS_PINRANGE(133, 59, 1),
+ CYGNUS_PINRANGE(134, 63, 1),
+ CYGNUS_PINRANGE(135, 67, 1),
+ CYGNUS_PINRANGE(136, 71, 1),
+ CYGNUS_PINRANGE(137, 73, 1),
+ CYGNUS_PINRANGE(138, 77, 1),
+ CYGNUS_PINRANGE(139, 79, 1),
+ CYGNUS_PINRANGE(140, 81, 1),
+ CYGNUS_PINRANGE(141, 83, 1),
+ CYGNUS_PINRANGE(142, 10, 1)
+};
+
+static unsigned cygnus_gpio_to_pin(unsigned gpio)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+ const struct cygnus_gpio_pin_range *range = cygnus_gpio_pintable
+ + i;
+
+ if ((gpio < range->offset) ||
+ (gpio >= (range->offset + range->num_pins)))
+ continue;
+
+ return range->pin_base + (gpio - range->offset);
+ }
+ return -1;
+}
+
+static struct cygnus_gpio *cygnus_get_gpio_core(unsigned gpio,
+ unsigned *gpio_offset)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cygnus_gpio_table); i++) {
+ struct cygnus_gpio *chip = cygnus_gpio_table + i;
+
+ if ((gpio < chip->gpio_base) ||
+ (gpio >= (chip->gpio_base + chip->ngpio)))
+ continue;
+
+ *gpio_offset = gpio - chip->gpio_base;
+ return chip;
+ }
+
+ return NULL;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+ return read32(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+ u32 val)
+{
+ write32(chip->base + offset, val);
+}
+
+/**
+ * cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ * Cygnus GPIO register
+ *
+ * @cygnus_gpio: Cygnus GPIO device
+ * @reg: register offset
+ * @gpio: GPIO pin
+ * @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+ unsigned gpio, int set)
+{
+ unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+ u32 val;
+
+ val = cygnus_readl(chip, offset);
+ if (set)
+ val |= BIT(shift);
+ else
+ val &= ~BIT(shift);
+ cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+ unsigned gpio)
+{
+ unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+ unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+ u32 val;
+
+ val = cygnus_readl(chip, offset) & BIT(shift);
+ if (val)
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct cygnus_gpio *chip, unsigned offset)
+{
+ /* not all Cygnus GPIO pins can be muxed individually */
+ if (!chip->pinmux_is_supported || (chip->pctl_priv == NULL))
+ return 0;
+
+ return cygnus_gpio_request_enable(chip->pctl_priv,
+ cygnus_gpio_to_pin(offset));
+}
+
+static void cygnus_gpio_free(struct cygnus_gpio *chip, unsigned offset)
+{
+ if (!chip->pinmux_is_supported || (chip->pctl_priv == NULL))
+ return;
+
+ cygnus_gpio_disable_free(chip->pctl_priv, cygnus_gpio_to_pin(offset));
+}
+
+static int cygnus_gpio_direction_input(struct cygnus_gpio *chip, unsigned gpio)
+{
+ cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+
+ dev_dbg(chip, "gpio:%u set input\n", gpio);
+
+ return 0;
+}
+
+static int cygnus_gpio_direction_output(struct cygnus_gpio *chip, unsigned gpio,
+ int value)
+{
+ cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+ cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+
+ dev_dbg(chip, "gpio:%u set output, value:%d\n", gpio, value);
+
+ return 0;
+}
+
+static void cygnus_gpio_set(struct cygnus_gpio *chip, unsigned gpio, int value)
+{
+ cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+
+ dev_dbg(chip, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct cygnus_gpio *chip, unsigned gpio)
+{
+ return cygnus_get_bit(chip, CYGNUS_GPIO_DATA_IN_OFFSET, gpio);
+}
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+ int disable, int pull_up)
+{
+ if (disable) {
+ cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+ } else {
+ cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pull_up);
+ cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+ }
+
+ dev_dbg(chip, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+ return 0;
+}
+
+#define CYGNUS_GPIO_TEST_AON_GPIO0 170
+#define CYGNUS_GPIO_TEST_SPI2_MISO 69
+#define CYGNUS_GPIO_TEST_DELAY_S 3
+
+static void cygnus_gpio_test(void)
+{
+ gpio_t gpio_in;
+ gpio_t gpio_out;
+ unsigned val;
+
+ printk(BIOS_INFO, "Start gpio test...\n");
+
+ gpio_in = CYGNUS_GPIO_TEST_AON_GPIO0; /* AON_GPIO0 */
+ gpio_input(gpio_in);
+ gpio_input_pulldown(gpio_in);
+ printk(BIOS_INFO, "GPIO get %d=%d\n", gpio_in, gpio_get(gpio_in));
+
+ gpio_in = CYGNUS_GPIO_TEST_SPI2_MISO; /* SPI2_MISO */
+ gpio_input(gpio_in);
+ gpio_input_pullup(gpio_in);
+ printk(BIOS_INFO, "GPIO get %d=%d\n", gpio_in, gpio_get(gpio_in));
+ val = 0;
+ gpio_out = CYGNUS_GPIO_TEST_SPI2_MISO;
+
+ gpio_output(gpio_out, val);
+ printk(BIOS_INFO, "GPIO set %d=%d\n", gpio_out, val);
+ delay(CYGNUS_GPIO_TEST_DELAY_S);
+
+ val = 1;
+ gpio_set(gpio_out, val);
+ printk(BIOS_INFO, "GPIO set %d=%d\n", gpio_out, val);
+ delay(CYGNUS_GPIO_TEST_DELAY_S);
+
+ val = 0;
+ gpio_set(gpio_out, val);
+ printk(BIOS_INFO, "GPIO set %d=%d\n", gpio_out, val);
+ delay(CYGNUS_GPIO_TEST_DELAY_S);
+
+ val = 1;
+ gpio_set(gpio_out, val);
+ printk(BIOS_INFO, "GPIO set %d=%d\n", gpio_out, val);
+ delay(CYGNUS_GPIO_TEST_DELAY_S);
+
+ val = 0;
+ gpio_set(gpio_out, val);
+ printk(BIOS_INFO, "GPIO set %d=%d\n", gpio_out, val);
+ delay(CYGNUS_GPIO_TEST_DELAY_S);
+
+ gpio_free(CYGNUS_GPIO_TEST_AON_GPIO0);
+ gpio_free(CYGNUS_GPIO_TEST_SPI2_MISO);
+ printk(BIOS_INFO, "Gpio test completed...\n");
+}
+
+void gpio_init(void)
+{
+ int i;
+
+ printk(BIOS_INFO, "Setting up the gpio...\n");
+
+ for (i = 0; i < ARRAY_SIZE(cygnus_gpio_table); i++) {
+ struct cygnus_gpio *chip = cygnus_gpio_table + i;
+
+ chip->num_banks = (chip->ngpio+NGPIOS_PER_BANK - 1)
+ / NGPIOS_PER_BANK;
+ if (chip->pinmux_is_supported)
+ chip->pctl_priv = cygnus_pinmux_init();
+ }
+
+ if (IS_ENABLED(CONFIG_CYGNUS_GPIO_TEST))
+ cygnus_gpio_test();
+}
+
+void gpio_free(gpio_t gpio)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ cygnus_gpio_free(chip, gpio_num);
+}
+
+void gpio_input(gpio_t gpio)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ if (cygnus_gpio_request(chip, gpio_num) != 0) {
+ printk(BIOS_ERR, "Cannot mux GPIO %d\n", gpio);
+ return;
+ }
+ cygnus_gpio_direction_input(chip, gpio_num);
+}
+
+void gpio_input_pulldown(gpio_t gpio)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ cygnus_gpio_set_pull(chip, gpio_num, 0, 0);
+}
+
+void gpio_input_pullup(gpio_t gpio)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ cygnus_gpio_set_pull(chip, gpio_num, 0, 1);
+}
+
+int gpio_get(gpio_t gpio)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return -1;
+ }
+
+ return cygnus_gpio_get(chip, gpio_num);
+}
+
+void gpio_set(gpio_t gpio, int value)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ cygnus_gpio_set(chip, gpio_num, value);
+}
+
+void gpio_output(gpio_t gpio, int value)
+{
+ struct cygnus_gpio *chip;
+ unsigned gpio_num;
+
+ chip = cygnus_get_gpio_core(gpio, &gpio_num);
+ if (chip == NULL) {
+ dev_dbg(chip, "unable to find chip for gpio %d", gpio);
+ return;
+ }
+
+ if (cygnus_gpio_request(chip, gpio_num) != 0) {
+ printk(BIOS_ERR, "Cannot mux GPIO %d\n", gpio);
+ return;
+ }
+ cygnus_gpio_direction_output(chip, gpio_num, value);
+}