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authorAntony Pavlov <antonynpavlov@gmail.com>2018-01-22 12:59:17 +0300
committerSascha Hauer <s.hauer@pengutronix.de>2018-01-29 08:26:46 +0100
commitf94c5f3b28e967c73c49dcda43b4b458f5b79e73 (patch)
tree2b822febf6ce4b848ebb2988c5911c2b373f6a4b /arch
parent25a12a30c7038e85187aa12baa2807c716dc8293 (diff)
downloadbarebox-f94c5f3b28e967c73c49dcda43b4b458f5b79e73.tar.gz
barebox-f94c5f3b28e967c73c49dcda43b4b458f5b79e73.tar.xz
sandbox: add gpio support with libftdi1
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/sandbox/Kconfig1
-rw-r--r--arch/sandbox/Makefile6
-rw-r--r--arch/sandbox/mach-sandbox/include/mach/linux.h12
-rw-r--r--arch/sandbox/os/Makefile3
-rw-r--r--arch/sandbox/os/ftdi.c154
5 files changed, 175 insertions, 1 deletions
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 9c72673bde..3f1cefb837 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -1,6 +1,7 @@
config SANDBOX
bool
select OFTREE
+ select GPIOLIB
default y
config ARCH_TEXT_BASE
diff --git a/arch/sandbox/Makefile b/arch/sandbox/Makefile
index 9d545c3b71..85c70b5e80 100644
--- a/arch/sandbox/Makefile
+++ b/arch/sandbox/Makefile
@@ -41,9 +41,13 @@ ifeq ($(CONFIG_DRIVER_VIDEO_SDL),y)
SDL_LIBS := $(shell pkg-config sdl --libs)
endif
+ifeq ($(CONFIG_GPIO_LIBFTDI1),y)
+FTDI1_LIBS := $(shell pkg-config libftdi1 --libs)
+endif
+
cmd_barebox__ = $(CC) -o $@ -Wl,-T,$(barebox-lds) \
-Wl,--start-group $(barebox-common) -Wl,--end-group \
- -lrt -lpthread $(SDL_LIBS)
+ -lrt -lpthread $(SDL_LIBS) $(FTDI1_LIBS)
common-y += $(BOARD) arch/sandbox/os/
diff --git a/arch/sandbox/mach-sandbox/include/mach/linux.h b/arch/sandbox/mach-sandbox/include/mach/linux.h
index 1327a56cab..52360f8771 100644
--- a/arch/sandbox/mach-sandbox/include/mach/linux.h
+++ b/arch/sandbox/mach-sandbox/include/mach/linux.h
@@ -38,4 +38,16 @@ void sdl_get_bitfield_rgba(struct fb_bitfield *r, struct fb_bitfield *g,
struct fb_bitfield *b, struct fb_bitfield *a);
void sdl_setpixel(int x, int y, uint8_t r, uint8_t g, uint8_t b, uint8_t a);
+struct ft2232_bitbang;
+struct ft2232_bitbang *barebox_libftdi1_open(int vendor_id, int device_id,
+ const char *serial);
+void barebox_libftdi1_gpio_direction(struct ft2232_bitbang *ftbb,
+ unsigned off, unsigned dir);
+int barebox_libftdi1_gpio_get_value(struct ft2232_bitbang *ftbb,
+ unsigned off);
+void barebox_libftdi1_gpio_set_value(struct ft2232_bitbang *ftbb,
+ unsigned off, unsigned val);
+int barebox_libftdi1_update(struct ft2232_bitbang *ftbb);
+void barebox_libftdi1_close(void);
+
#endif /* __ASM_ARCH_LINUX_H */
diff --git a/arch/sandbox/os/Makefile b/arch/sandbox/os/Makefile
index 537f848e06..75baa34a83 100644
--- a/arch/sandbox/os/Makefile
+++ b/arch/sandbox/os/Makefile
@@ -17,3 +17,6 @@ obj-y = common.o tap.o
CFLAGS_sdl.o = $(shell pkg-config sdl --cflags)
obj-$(CONFIG_DRIVER_VIDEO_SDL) += sdl.o
+
+CFLAGS_ftdi.o = $(shell pkg-config libftdi1 --cflags)
+obj-$(CONFIG_GPIO_LIBFTDI1) += ftdi.o
diff --git a/arch/sandbox/os/ftdi.c b/arch/sandbox/os/ftdi.c
new file mode 100644
index 0000000000..6485d5cfab
--- /dev/null
+++ b/arch/sandbox/os/ftdi.c
@@ -0,0 +1,154 @@
+/*
+ * sandbox barebox libftdi1 support
+ *
+ * Copyright (C) 2016, 2017 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <stdio.h>
+#include <ftdi.h>
+
+#define GPIOF_DIR_OUT (0 << 0)
+#define GPIOF_DIR_IN (1 << 0)
+
+#define BIT(nr) (1UL << (nr))
+
+struct ft2232_bitbang {
+ struct ftdi_context *ftdi;
+ uint8_t odata;
+ uint8_t dir;
+};
+
+static struct ft2232_bitbang ftbb;
+
+static inline int ftdi_flush(struct ftdi_context *ftdi)
+{
+ uint8_t buf[1];
+ int ret;
+
+ buf[0] = SEND_IMMEDIATE;
+
+ ret = ftdi_write_data(ftdi, buf, 1);
+
+ return ret;
+}
+
+static int ftdi_get_high_byte_data(struct ftdi_context *ftdi, uint8_t *data)
+{
+ uint8_t obuf;
+ int ret;
+
+ obuf = GET_BITS_HIGH;
+ ret = ftdi_write_data(ftdi, &obuf, 1);
+
+ ret = ftdi_read_data(ftdi, data, 1);
+
+ return ret;
+}
+
+static int ftdi_set_high_byte_data_dir(struct ft2232_bitbang *ftbb)
+{
+ uint8_t buf[3];
+ int ret;
+
+ buf[0] = SET_BITS_HIGH;
+ buf[1] = ftbb->odata;
+ buf[2] = ftbb->dir;
+
+ ret = ftdi_write_data(ftbb->ftdi, buf, 3);
+ ftdi_flush(ftbb->ftdi);
+
+ return ret;
+}
+
+int barebox_libftdi1_update(struct ft2232_bitbang *ftbb)
+{
+ return ftdi_set_high_byte_data_dir(ftbb);
+}
+
+void barebox_libftdi1_gpio_direction(struct ft2232_bitbang *ftbb,
+ unsigned off, unsigned dir)
+{
+ switch (dir) {
+ case GPIOF_DIR_IN:
+ ftbb->dir &= ~BIT(off);
+ break;
+ case GPIOF_DIR_OUT:
+ ftbb->dir |= BIT(off);
+ break;
+ default:
+ printf("%s:%d: invalid dir argument\n", __FILE__, __LINE__);
+ }
+}
+
+int barebox_libftdi1_gpio_get_value(struct ft2232_bitbang *ftbb, unsigned off)
+{
+ uint8_t data;
+
+ ftdi_get_high_byte_data(ftbb->ftdi, &data);
+
+ return !!(data & BIT(off));
+}
+
+void barebox_libftdi1_gpio_set_value(struct ft2232_bitbang *ftbb,
+ unsigned off, unsigned val)
+{
+ if (val)
+ ftbb->odata |= BIT(off);
+ else
+ ftbb->odata &= ~BIT(off);
+}
+
+struct ft2232_bitbang *barebox_libftdi1_open(int id_vendor, int id_product,
+ const char *serial)
+{
+ struct ftdi_context *ftdi;
+ int ret;
+
+ ftdi = ftdi_new();
+ if (!ftdi) {
+ fprintf(stderr, "ftdi_new failed\n");
+ goto error;
+ }
+
+ ret = ftdi_usb_open_desc(ftdi, id_vendor, id_product, NULL, serial);
+ if (ret < 0 && ret != -5) {
+ fprintf(stderr, "unable to open ftdi device: %d (%s)\n",
+ ret, ftdi_get_error_string(ftdi));
+ goto error;
+ }
+
+ ftdi_set_interface(ftdi, INTERFACE_A);
+ ftdi_set_bitmode(ftdi, 0x00, BITMODE_MPSSE);
+
+ ftbb.ftdi = ftdi;
+
+ /* reset pins to default neutral state */
+ ftbb.dir = 0;
+ ftbb.odata = 0;
+ ftdi_set_high_byte_data_dir(&ftbb);
+
+ return &ftbb;
+
+error:
+ return NULL;
+}
+
+void barebox_libftdi1_close(void)
+{
+ struct ftdi_context *ftdi = ftbb.ftdi;
+
+ ftdi_set_interface(ftdi, INTERFACE_ANY);
+ ftdi_usb_close(ftdi);
+ ftdi_free(ftdi);
+}