[PATCH 2/5] arm/raspberrypi: add VideoCore framebuffer without initialization
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ppisa4lists at pikron.com
Sat May 21 10:54:56 UTC 2016
From: YANG Qiao <yangqiao0505 at me.com>
---
c/src/lib/libbsp/arm/raspberrypi/Makefile.am | 2 +
c/src/lib/libbsp/arm/raspberrypi/console/fb.c | 385 ++++++++++++++++++++++
c/src/lib/libbsp/arm/raspberrypi/include/rpi-fb.h | 53 +++
c/src/lib/libbsp/arm/raspberrypi/preinstall.am | 4 +
4 files changed, 444 insertions(+)
create mode 100644 c/src/lib/libbsp/arm/raspberrypi/console/fb.c
create mode 100644 c/src/lib/libbsp/arm/raspberrypi/include/rpi-fb.h
diff --git a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
index 258f8a0..285da4f 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
+++ b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
@@ -50,6 +50,7 @@ include_bsp_HEADERS += include/i2c.h
include_bsp_HEADERS += include/spi.h
include_bsp_HEADERS += include/mailbox.h
include_bsp_HEADERS += include/vc.h
+include_bsp_HEADERS += include/rpi-fb.h
include_libcpu_HEADERS = ../../../libcpu/arm/shared/include/cache_.h \
../../../libcpu/arm/shared/include/arm-cp15.h
@@ -114,6 +115,7 @@ libbsp_a_SOURCES += ../../shared/console_select.c
libbsp_a_SOURCES += ../../shared/console_write.c
libbsp_a_SOURCES += console/console-config.c
libbsp_a_SOURCES += console/usart.c
+libbsp_a_SOURCES += console/fb.c
# Mailbox
libbsp_a_SOURCES += misc/mailbox.c
diff --git a/c/src/lib/libbsp/arm/raspberrypi/console/fb.c b/c/src/lib/libbsp/arm/raspberrypi/console/fb.c
new file mode 100644
index 0000000..ba285e7
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/console/fb.c
@@ -0,0 +1,385 @@
+/**
+ * @file
+ *
+ * @ingroup raspberrypi
+ *
+ * @brief framebuffer support.
+ */
+
+/*
+ * Copyright (c) 2015 Yang Qiao
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ *
+ * http://www.rtems.org/license/LICENSE
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <bsp.h>
+#include <bsp/raspberrypi.h>
+#include <bsp/mailbox.h>
+#include <bsp/vc.h>
+#include <bsp/rpi-fb.h>
+
+#include <libcpu/arm-cp15.h>
+
+#include <rtems.h>
+#include <rtems/libio.h>
+#include <rtems/fb.h>
+#include <rtems/framebuffer.h>
+#include <rtems/score/atomic.h>
+
+#define SCREEN_WIDTH 1024
+#define SCREEN_HEIGHT 768
+#define BPP 32
+
+/* flag to limit driver to protect against multiple opens */
+static Atomic_Flag driver_mutex;
+
+/*
+ * screen information for the driver (fb0).
+ */
+
+static struct fb_var_screeninfo fb_var_info = {
+ .xres = SCREEN_WIDTH,
+ .yres = SCREEN_HEIGHT,
+ .bits_per_pixel = BPP
+};
+
+static struct fb_fix_screeninfo fb_fix_info = {
+ .smem_start = (void *) NULL,
+ .smem_len = 0,
+ .type = FB_TYPE_PACKED_PIXELS,
+ .visual = FB_VISUAL_TRUECOLOR,
+ .line_length = 0
+};
+
+typedef enum {
+ NO_SUITABLE_MODE = -1,
+ BAD_FORMAT = -2,
+ AUTO_SELECT = -3,
+ DONT_INIT = -4,
+ NO_MODE_REQ = -5,
+} mode_err_ret_val;
+
+int raspberrypi_get_fix_screen_info( struct fb_fix_screeninfo *info )
+{
+ *info = fb_fix_info;
+ return 0;
+}
+
+int raspberrypi_get_var_screen_info( struct fb_var_screeninfo *info )
+{
+ *info = fb_var_info;
+ return 0;
+}
+
+/**
+ * @brief Find mode given in string format.
+ *
+ * expected format
+ * <resX>x<resY>[-<bpp>]
+ * numbers <resX>, <resY> and <bpp> are decadic
+ *
+ * @param[out] fb_var_ptr pointer to variable mode part filled by function
+ * @param[in] video_string string to be parsed
+ * @retval video mode number to be set
+ * @retval -1 no suitable mode found
+ * @retval -2 bad format of the video_string
+ * @retval -3 automatic mode selection requested
+ * @retval -4 request to not initialize graphics
+ * @retval -5 no mode requested/empty video string
+ */
+
+static int
+parse_mode_from_string(struct fb_var_screeninfo *fb_var_ptr,
+ const char *video_string)
+{
+ const char* opt;
+ char* endptr;
+ uint32_t width;
+ uint32_t height;
+ uint32_t bpp = 0;
+
+ opt = video_string;
+
+ if (opt == NULL)
+ return NO_MODE_REQ;
+ if (strncmp(opt, "auto", 4) == 0)
+ return AUTO_SELECT;
+ if (strncmp(opt, "none", 4) == 0 ||
+ strncmp(opt, "off", 3) == 0)
+ return DONT_INIT;
+
+ width = strtol(opt, &endptr, 10);
+ if (*endptr != 'x')
+ {
+ return BAD_FORMAT;
+ }
+ opt = endptr + 1;
+ height = strtol(opt, &endptr, 10);
+ switch (*endptr)
+ {
+ case '-':
+ opt = endptr + 1;
+ endptr = NULL;
+ bpp = strtol(opt, &endptr, 10);
+ if ((endptr == opt) || (endptr == NULL))
+ return BAD_FORMAT;
+ if (*endptr && (*endptr != ' '))
+ return BAD_FORMAT;
+ break;
+ case ' ':
+ case 0:
+ break;
+ default:
+ return BAD_FORMAT;
+ }
+
+ fb_var_ptr->xres = width;
+ fb_var_ptr->yres = height;
+ if (bpp != 0)
+ fb_var_ptr->bits_per_pixel = bpp;
+
+ return 0;
+}
+
+static int
+find_mode_from_vc(void)
+{
+ bcm2835_get_display_size_entries entries;
+ bcm2835_mailbox_get_display_size(&entries);
+ unsigned int width = entries.width;
+ unsigned int height = entries.height;
+
+ if (width == 0 || height == 0)
+ {
+ fb_var_info.xres = SCREEN_WIDTH;
+ fb_var_info.yres = SCREEN_HEIGHT;
+ }
+ else
+ {
+ fb_var_info.xres = width;
+ fb_var_info.yres = height;
+ }
+
+ return 0;
+}
+
+static bool
+hdmi_is_present(void)
+{
+ bcm2835_get_display_size_entries entries;
+ bcm2835_mailbox_get_display_size(&entries);
+ if(entries.width == 0x290 && entries.height ==0x1A0 )
+ {
+ return false;
+ }
+ else
+ {
+ return true;
+ }
+}
+
+int
+raspberrypi_fb_init(void)
+{
+ int mode_from_cmdline;
+
+ if (fb_fix_info.smem_start != NULL)
+ {
+ return RASPBERRYPI_FB_INIT_ALREADY_INITIALIZED;
+ }
+
+ if (hdmi_is_present() == false)
+ {
+ return RASPBERRYPI_FB_INIT_NO_DISPLAY;
+ }
+
+ mode_from_cmdline = parse_mode_from_string(&fb_var_info,
+ rpi_cmdline_get_arg("--video="));
+ switch (mode_from_cmdline)
+ {
+ case BAD_FORMAT:
+ return RASPBERRYPI_FB_INIT_CMDLINE_BAD_FORMAT;
+ case AUTO_SELECT:
+ break;
+ case DONT_INIT:
+ return RASPBERRYPI_FB_INIT_CMDLINE_DONT_INIT;
+ case NO_MODE_REQ:
+ return RASPBERRYPI_FB_INIT_CMDLINE_NO_MODE_REQ;
+ }
+
+ if (mode_from_cmdline)
+ {
+ if(find_mode_from_vc())
+ return RASPBERRYPI_FB_INIT_MODE_PROBE_ERROR;
+ }
+
+ bcm2835_init_frame_buffer_entries init_frame_buffer_entries;
+ init_frame_buffer_entries.xres = fb_var_info.xres;
+ init_frame_buffer_entries.yres = fb_var_info.yres;
+ init_frame_buffer_entries.xvirt = fb_var_info.xres;
+ init_frame_buffer_entries.yvirt = fb_var_info.yres;
+ init_frame_buffer_entries.depth = fb_var_info.bits_per_pixel;
+ init_frame_buffer_entries.pixel_order = bcm2835_mailbox_pixel_order_rgb;
+ init_frame_buffer_entries.alpha_mode = bcm2835_mailbox_alpha_mode_0_opaque;
+ init_frame_buffer_entries.voffset_x = 0;
+ init_frame_buffer_entries.voffset_y = 0;
+ init_frame_buffer_entries.overscan_left = 0;
+ init_frame_buffer_entries.overscan_right = 0;
+ init_frame_buffer_entries.overscan_top = 0;
+ init_frame_buffer_entries.overscan_bottom = 0;
+ bcm2835_mailbox_init_frame_buffer(&init_frame_buffer_entries);
+
+ bcm2835_get_pitch_entries get_pitch_entries;
+ bcm2835_mailbox_get_pitch(&get_pitch_entries);
+
+ fb_var_info.xres = init_frame_buffer_entries.xres;
+ fb_var_info.yres = init_frame_buffer_entries.yres;
+ fb_var_info.bits_per_pixel = init_frame_buffer_entries.depth;
+ fb_fix_info.smem_start = (void *)init_frame_buffer_entries.base;
+ fb_fix_info.smem_len = init_frame_buffer_entries.size;
+ fb_fix_info.line_length = get_pitch_entries.pitch;
+
+ if (fb_fix_info.smem_start == NULL)
+ return RASPBERRYPI_FB_INIT_START_ADDR_UNKNOWN;
+
+ arm_cp15_set_translation_table_entries((void *)fb_fix_info.smem_start,
+ (void *)fb_fix_info.smem_start +
+ fb_fix_info.smem_len,
+ ARMV7_MMU_DATA_READ_WRITE_CACHED);
+
+ return RASPBERRYPI_FB_INIT_OK;
+}
+
+/*
+ * fbds device driver initialize entry point.
+ */
+
+rtems_device_driver
+frame_buffer_initialize (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ rtems_status_code status;
+
+ /* register the devices */
+ status = rtems_io_register_name (FRAMEBUFFER_DEVICE_0_NAME, major, 0);
+ if (status != RTEMS_SUCCESSFUL) {
+ printk ("[!] error registering framebuffer\n");
+ rtems_fatal_error_occurred (status);
+ }
+ _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE);
+ return RTEMS_SUCCESSFUL;
+}
+
+/*
+ * fbds device driver open operation.
+ */
+
+rtems_device_driver
+frame_buffer_open (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ if (_Atomic_Flag_test_and_set(&driver_mutex, ATOMIC_ORDER_ACQUIRE) != 0 ) {
+ printk( "FB_CIRRUS could not lock driver_mutex\n" );
+ return RTEMS_UNSATISFIED;
+ }
+
+ memset ((void *)fb_fix_info.smem_start, 0, fb_fix_info.smem_len);
+ return RTEMS_SUCCESSFUL;
+}
+
+/*
+ * fbds device driver close operation.
+ */
+
+rtems_device_driver
+frame_buffer_close (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ /* restore previous state. for VGA this means return to text mode.
+ * leave out if graphics hardware has been initialized in
+ * frame_buffer_initialize() */
+ _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE);
+ memset ((void *)fb_fix_info.smem_start, 0, fb_fix_info.smem_len);
+ return RTEMS_SUCCESSFUL;
+}
+
+/*
+ * fbds device driver read operation.
+ */
+
+rtems_device_driver
+frame_buffer_read (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
+ rw_args->bytes_moved =
+ ((rw_args->offset + rw_args->count) > fb_fix_info.smem_len ) ?
+ (fb_fix_info.smem_len - rw_args->offset) :rw_args->count;
+ memcpy( rw_args->buffer,
+ (const void *) (fb_fix_info.smem_start + rw_args->offset),
+ rw_args->bytes_moved);
+ return RTEMS_SUCCESSFUL;
+}
+
+/*
+ * fbds device driver write operation.
+ */
+
+rtems_device_driver
+frame_buffer_write (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
+ rw_args->bytes_moved =
+ ((rw_args->offset + rw_args->count) > fb_fix_info.smem_len ) ?
+ (fb_fix_info.smem_len - rw_args->offset) : rw_args->count;
+ memcpy( (void *) (fb_fix_info.smem_start + rw_args->offset),
+ rw_args->buffer,
+ rw_args->bytes_moved);
+ return RTEMS_SUCCESSFUL;
+}
+
+/*
+ * ioctl entry point.
+ */
+
+rtems_device_driver
+frame_buffer_control (rtems_device_major_number major,
+ rtems_device_minor_number minor, void *arg)
+{
+ rtems_libio_ioctl_args_t *args = arg;
+
+ /* XXX check minor */
+
+ switch (args->command) {
+ case FBIOGET_VSCREENINFO:
+ memcpy (args->buffer, &fb_var_info, sizeof (fb_var_info));
+ args->ioctl_return = 0;
+ break;
+ case FBIOGET_FSCREENINFO:
+ memcpy (args->buffer, &fb_fix_info, sizeof (fb_fix_info));
+ args->ioctl_return = 0;
+ break;
+ case FBIOGETCMAP:
+ args->ioctl_return = 0;
+ break;
+ case FBIOPUTCMAP:
+ args->ioctl_return = 0;
+ break;
+
+ default:
+ args->ioctl_return = 0;
+ break;
+
+ }
+ return RTEMS_SUCCESSFUL;
+}
diff --git a/c/src/lib/libbsp/arm/raspberrypi/include/rpi-fb.h b/c/src/lib/libbsp/arm/raspberrypi/include/rpi-fb.h
new file mode 100644
index 0000000..3d2e5e9
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/include/rpi-fb.h
@@ -0,0 +1,53 @@
+/**
+ * @file
+ *
+ * @ingroup raspberrypi_fb
+ *
+ * @brief framebuffer support and setup
+ *
+ */
+
+/*
+ * Copyright (c) 2015 Yang Qiao
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ *
+ * http://www.rtems.org/license/LICENSE
+ *
+ */
+
+#ifndef LIBBSP_ARM_RASPBERRYPI_FB_H
+#define LIBBSP_ARM_RASPBERRYPI_FB_H
+
+#include <rtems/fb.h>
+
+/**
+ * @defgroup raspberrypi_fb
+ *
+ * @ingroup arm_raspberrypi
+ *
+ * @brief Framebuffer support and setup
+ *
+ * @{
+ */
+
+enum raspberrypi_fb_init_result {
+ RASPBERRYPI_FB_INIT_OK = 0,
+ RASPBERRYPI_FB_INIT_ALREADY_INITIALIZED = 1,
+ RASPBERRYPI_FB_INIT_GENERIC_ERROR = -1,
+ RASPBERRYPI_FB_INIT_NO_DISPLAY = -2,
+ RASPBERRYPI_FB_INIT_CMDLINE_BAD_FORMAT = -3,
+ RASPBERRYPI_FB_INIT_CMDLINE_DONT_INIT = -4,
+ RASPBERRYPI_FB_INIT_CMDLINE_NO_MODE_REQ = -5,
+ RASPBERRYPI_FB_INIT_MODE_PROBE_ERROR = -6,
+ RASPBERRYPI_FB_INIT_START_ADDR_UNKNOWN = -7,
+};
+
+int raspberrypi_fb_init(void);
+int raspberrypi_get_fix_screen_info( struct fb_fix_screeninfo *info );
+int raspberrypi_get_var_screen_info( struct fb_var_screeninfo *info );
+
+/** @} */
+
+#endif /* LIBBSP_ARM_RASPBERRYPI_FB_H */
diff --git a/c/src/lib/libbsp/arm/raspberrypi/preinstall.am b/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
index 979cba3..cbfa79f 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
+++ b/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
@@ -154,6 +154,10 @@ $(PROJECT_INCLUDE)/bsp/vc.h: include/vc.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/vc.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/vc.h
+$(PROJECT_INCLUDE)/bsp/rpi-fb.h: include/rpi-fb.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
+ $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/rpi-fb.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/rpi-fb.h
+
$(PROJECT_INCLUDE)/libcpu/cache_.h: ../../../libcpu/arm/shared/include/cache_.h $(PROJECT_INCLUDE)/libcpu/$(dirstamp)
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/libcpu/cache_.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/libcpu/cache_.h
--
1.9.1
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