mirror of
git://projects.qi-hardware.com/iris.git
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115 lines
2.9 KiB
COBOL
115 lines
2.9 KiB
COBOL
#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// boot-programs/lcd.ccp: Display driver.
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// Copyright 2009 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "devices.hh"
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#define ARCH
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#include "arch.hh"
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// Pin definitions, all in port 2.
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#define PWM_ENABLE (1 << 30)
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#define SPEN (1 << 0) //LCD_SPL
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#define SPCK (1 << 1) //LCD_CLS
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#define SPDA (1 << 2) //LCD_PS
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#define LCD_RET (1 << 3) //LCD_REV //use for lcd reset
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static void set_backlight (bool state):
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if state:
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PWM_DUT (0) = 300
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PWM_CTR (0) = 0xbf
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GPIO_GPDR (2) |= PWM_ENABLE
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else:
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PWM_DUT (0) = 0
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PWM_CTR (0) = 0x3f
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GPIO_GPDR (2) &= ~PWM_ENABLE
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static void reset ():
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PWM_PER (0) = 300
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set_backlight (false)
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// initialize things.
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GPIO_GPIER (2) &= ~(PWM_ENABLE | LCD_RET | SPEN | SPCK | SPDA)
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GPIO_GPDIR (2) |= PWM_ENABLE | LCD_RET | SPEN | SPCK | SPDA
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udelay (50)
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GPIO_GPDR (2) &= ~LCD_RET
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ddelay (2)
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GPIO_GPDR (2) |= LCD_RET
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ddelay (1)
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// For now, support only 16 bpp.
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// Screen is 800x480 tft.
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unsigned h = 800, v = 480, hs = 80, vs = 20, fps = 60, Bpp = 2
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LCD_CTRL = LCD_CTRL_BPP_16 | LCD_CTRL_BST_16
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LCD_VSYNC = vs
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LCD_HSYNC = hs
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LCD_DAV = (vs << 16) | (vs + v)
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LCD_DAH = (hs << 16) | (hs + h)
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LCD_VAT = ((hs + h) << 16) | (vs + v)
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#define MODE_TFT_GEN 0
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#define PCLK_N (1 << 10)
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#define VSYNC_N (1 << 8)
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LCD_CFG = MODE_TFT_GEN | PCLK_N | VSYNC_N
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cpm_stop_lcd ()
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unsigned pllout = cpm_get_pllout ()
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unsigned pixclock = fps * (hs + h) * (vs + v)
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CPM_CFCR2 = pllout / pixclock - 1
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unsigned val = pllout / (pixclock * 4) - 1
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while val < 0xf && pllout / (val + 1) > 150000000:
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++val
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cpm_set_lcdclk_div (val)
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CPM_CFCR |= CPM_CFCR_UPE
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cpm_start_lcd ()
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udelay (1000)
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//LCD_DA0 = framebuffer
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unsigned frame_size = v * h * Bpp
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LCD_CMD0 = LCD_CMD_SOFINT | LCD_CMD_EOFINT | (frame_size << LCD_CMD_LEN_BIT)
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lcd_set_ena ()
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lcd_enable_eof_intr ()
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int main ():
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map_gpio ()
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map_pwm0 ()
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map_lcd ()
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map_cpm ()
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reset ()
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register_interrupt (IRQ_LCD)
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set_backlight (true)
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while true:
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Message msg
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if !wait (&msg):
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continue
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switch msg.protected_data:
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case IRQ_LCD:
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kdebug (0)
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LCD_STATE &= ~LCD_STATE_EOF
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register_interrupt (IRQ_LCD)
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// TODO: allow callback
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break
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case LCD_BACKLIGHT:
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set_backlight (msg.data[0])
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break
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case LCD_RESET:
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reset ()
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break
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