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yaml --- r: 94196 b: refs/heads/master c: 03c33a4 h: refs/heads/master v: v3
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Jaya Kumar
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Linus Torvalds
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Apr 28, 2008
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 963654a9c919d18f8b9137f8ffd9d2d30a139269 | ||
| refs/heads/master: 03c33a4f002b2521debf1efc269cade983b6e86a |
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| /* | ||
| * linux/drivers/video/am200epd.c -- Platform device for AM200 EPD kit | ||
| * | ||
| * Copyright (C) 2008, Jaya Kumar | ||
| * | ||
| * This file is subject to the terms and conditions of the GNU General Public | ||
| * License. See the file COPYING in the main directory of this archive for | ||
| * more details. | ||
| * | ||
| * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. | ||
| * | ||
| * This work was made possible by help and equipment support from E-Ink | ||
| * Corporation. http://support.eink.com/community | ||
| * | ||
| * This driver is written to be used with the Metronome display controller. | ||
| * on the AM200 EPD prototype kit/development kit with an E-Ink 800x600 | ||
| * Vizplex EPD on a Gumstix board using the Lyre interface board. | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/module.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/string.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/interrupt.h> | ||
| #include <linux/fb.h> | ||
| #include <linux/init.h> | ||
| #include <linux/platform_device.h> | ||
| #include <linux/list.h> | ||
| #include <linux/uaccess.h> | ||
| #include <linux/irq.h> | ||
|
|
||
| #include <video/metronomefb.h> | ||
|
|
||
| #include <asm/arch/pxa-regs.h> | ||
|
|
||
| /* register offsets for gpio control */ | ||
| #define LED_GPIO_PIN 51 | ||
| #define STDBY_GPIO_PIN 48 | ||
| #define RST_GPIO_PIN 49 | ||
| #define RDY_GPIO_PIN 32 | ||
| #define ERR_GPIO_PIN 17 | ||
| #define PCBPWR_GPIO_PIN 16 | ||
|
|
||
| #define AF_SEL_GPIO_N 0x3 | ||
| #define GAFR0_U_OFFSET(pin) ((pin - 16) * 2) | ||
| #define GAFR1_L_OFFSET(pin) ((pin - 32) * 2) | ||
| #define GAFR1_U_OFFSET(pin) ((pin - 48) * 2) | ||
| #define GPDR1_OFFSET(pin) (pin - 32) | ||
| #define GPCR1_OFFSET(pin) (pin - 32) | ||
| #define GPSR1_OFFSET(pin) (pin - 32) | ||
| #define GPCR0_OFFSET(pin) (pin) | ||
| #define GPSR0_OFFSET(pin) (pin) | ||
|
|
||
| static void am200_set_gpio_output(int pin, int val) | ||
| { | ||
| u8 index; | ||
|
|
||
| index = pin >> 4; | ||
|
|
||
| switch (index) { | ||
| case 1: | ||
| if (val) | ||
| GPSR0 |= (1 << GPSR0_OFFSET(pin)); | ||
| else | ||
| GPCR0 |= (1 << GPCR0_OFFSET(pin)); | ||
| break; | ||
| case 2: | ||
| break; | ||
| case 3: | ||
| if (val) | ||
| GPSR1 |= (1 << GPSR1_OFFSET(pin)); | ||
| else | ||
| GPCR1 |= (1 << GPCR1_OFFSET(pin)); | ||
| break; | ||
| default: | ||
| printk(KERN_ERR "unimplemented\n"); | ||
| } | ||
| } | ||
|
|
||
| static void __devinit am200_init_gpio_pin(int pin, int dir) | ||
| { | ||
| u8 index; | ||
| /* dir 0 is output, 1 is input | ||
| - do 2 things here: | ||
| - set gpio alternate function to standard gpio | ||
| - set gpio direction to input or output */ | ||
|
|
||
| index = pin >> 4; | ||
| switch (index) { | ||
| case 1: | ||
| GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin)); | ||
|
|
||
| if (dir) | ||
| GPDR0 &= ~(1 << pin); | ||
| else | ||
| GPDR0 |= (1 << pin); | ||
| break; | ||
| case 2: | ||
| GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin)); | ||
|
|
||
| if (dir) | ||
| GPDR1 &= ~(1 << GPDR1_OFFSET(pin)); | ||
| else | ||
| GPDR1 |= (1 << GPDR1_OFFSET(pin)); | ||
| break; | ||
| case 3: | ||
| GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin)); | ||
|
|
||
| if (dir) | ||
| GPDR1 &= ~(1 << GPDR1_OFFSET(pin)); | ||
| else | ||
| GPDR1 |= (1 << GPDR1_OFFSET(pin)); | ||
| break; | ||
| default: | ||
| printk(KERN_ERR "unimplemented\n"); | ||
| } | ||
| } | ||
|
|
||
| static void am200_init_gpio_regs(struct metronomefb_par *par) | ||
| { | ||
| am200_init_gpio_pin(LED_GPIO_PIN, 0); | ||
| am200_set_gpio_output(LED_GPIO_PIN, 0); | ||
|
|
||
| am200_init_gpio_pin(STDBY_GPIO_PIN, 0); | ||
| am200_set_gpio_output(STDBY_GPIO_PIN, 0); | ||
|
|
||
| am200_init_gpio_pin(RST_GPIO_PIN, 0); | ||
| am200_set_gpio_output(RST_GPIO_PIN, 0); | ||
|
|
||
| am200_init_gpio_pin(RDY_GPIO_PIN, 1); | ||
|
|
||
| am200_init_gpio_pin(ERR_GPIO_PIN, 1); | ||
|
|
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| am200_init_gpio_pin(PCBPWR_GPIO_PIN, 0); | ||
| am200_set_gpio_output(PCBPWR_GPIO_PIN, 0); | ||
| } | ||
|
|
||
| static void am200_disable_lcd_controller(struct metronomefb_par *par) | ||
| { | ||
| LCSR = 0xffffffff; /* Clear LCD Status Register */ | ||
| LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */ | ||
|
|
||
| /* we reset and just wait for things to settle */ | ||
| msleep(200); | ||
| } | ||
|
|
||
| static void am200_enable_lcd_controller(struct metronomefb_par *par) | ||
| { | ||
| LCSR = 0xffffffff; | ||
| FDADR0 = par->metromem_desc_dma; | ||
| LCCR0 |= LCCR0_ENB; | ||
| } | ||
|
|
||
| static void am200_init_lcdc_regs(struct metronomefb_par *par) | ||
| { | ||
| /* here we do: | ||
| - disable the lcd controller | ||
| - setup lcd control registers | ||
| - setup dma descriptor | ||
| - reenable lcd controller | ||
| */ | ||
|
|
||
| /* disable the lcd controller */ | ||
| am200_disable_lcd_controller(par); | ||
|
|
||
| /* setup lcd control registers */ | ||
| LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS | ||
| | LCCR0_QDM | LCCR0_BM | LCCR0_OUM; | ||
|
|
||
| LCCR1 = (par->info->var.xres/2 - 1) /* pixels per line */ | ||
| | (27 << 10) /* hsync pulse width - 1 */ | ||
| | (33 << 16) /* eol pixel count */ | ||
| | (33 << 24); /* bol pixel count */ | ||
|
|
||
| LCCR2 = (par->info->var.yres - 1) /* lines per panel */ | ||
| | (24 << 10) /* vsync pulse width - 1 */ | ||
| | (2 << 16) /* eof pixel count */ | ||
| | (0 << 24); /* bof pixel count */ | ||
|
|
||
| LCCR3 = 2 /* pixel clock divisor */ | ||
| | (24 << 8) /* AC Bias pin freq */ | ||
| | LCCR3_16BPP /* BPP */ | ||
| | LCCR3_PCP; /* PCP falling edge */ | ||
|
|
||
| } | ||
|
|
||
| static void am200_post_dma_setup(struct metronomefb_par *par) | ||
| { | ||
| par->metromem_desc->mFDADR0 = par->metromem_desc_dma; | ||
| par->metromem_desc->mFSADR0 = par->metromem_dma; | ||
| par->metromem_desc->mFIDR0 = 0; | ||
| par->metromem_desc->mLDCMD0 = par->info->var.xres | ||
| * par->info->var.yres; | ||
| am200_enable_lcd_controller(par); | ||
| } | ||
|
|
||
| static void am200_free_irq(struct fb_info *info) | ||
| { | ||
| free_irq(IRQ_GPIO(RDY_GPIO_PIN), info); | ||
| } | ||
|
|
||
| static irqreturn_t am200_handle_irq(int irq, void *dev_id) | ||
| { | ||
| struct fb_info *info = dev_id; | ||
| struct metronomefb_par *par = info->par; | ||
|
|
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| wake_up_interruptible(&par->waitq); | ||
| return IRQ_HANDLED; | ||
| } | ||
|
|
||
| static int am200_setup_irq(struct fb_info *info) | ||
| { | ||
| int retval; | ||
|
|
||
| retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq, | ||
| IRQF_DISABLED, "AM200", info); | ||
| if (retval) { | ||
| printk(KERN_ERR "am200epd: request_irq failed: %d\n", retval); | ||
| return retval; | ||
| } | ||
|
|
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| return set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING); | ||
| } | ||
|
|
||
| static void am200_set_rst(struct metronomefb_par *par, int state) | ||
| { | ||
| am200_set_gpio_output(RST_GPIO_PIN, state); | ||
| } | ||
|
|
||
| static void am200_set_stdby(struct metronomefb_par *par, int state) | ||
| { | ||
| am200_set_gpio_output(STDBY_GPIO_PIN, state); | ||
| } | ||
|
|
||
| static int am200_wait_event(struct metronomefb_par *par) | ||
| { | ||
| return wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ); | ||
| } | ||
|
|
||
| static int am200_wait_event_intr(struct metronomefb_par *par) | ||
| { | ||
| return wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ); | ||
| } | ||
|
|
||
| static struct metronome_board am200_board = { | ||
| .owner = THIS_MODULE, | ||
| .free_irq = am200_free_irq, | ||
| .setup_irq = am200_setup_irq, | ||
| .init_gpio_regs = am200_init_gpio_regs, | ||
| .init_lcdc_regs = am200_init_lcdc_regs, | ||
| .post_dma_setup = am200_post_dma_setup, | ||
| .set_rst = am200_set_rst, | ||
| .set_stdby = am200_set_stdby, | ||
| .met_wait_event = am200_wait_event, | ||
| .met_wait_event_intr = am200_wait_event_intr, | ||
| }; | ||
|
|
||
| static struct platform_device *am200_device; | ||
|
|
||
| static int __init am200_init(void) | ||
| { | ||
| int ret; | ||
|
|
||
| /* request our platform independent driver */ | ||
| request_module("metronomefb"); | ||
|
|
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| am200_device = platform_device_alloc("metronomefb", -1); | ||
| if (!am200_device) | ||
| return -ENOMEM; | ||
|
|
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| platform_device_add_data(am200_device, &am200_board, | ||
| sizeof(am200_board)); | ||
|
|
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| /* this _add binds metronomefb to am200. metronomefb refcounts am200 */ | ||
| ret = platform_device_add(am200_device); | ||
|
|
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| if (ret) | ||
| platform_device_put(am200_device); | ||
|
|
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| return ret; | ||
| } | ||
|
|
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| static void __exit am200_exit(void) | ||
| { | ||
| platform_device_unregister(am200_device); | ||
| } | ||
|
|
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| module_init(am200_init); | ||
| module_exit(am200_exit); | ||
|
|
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| MODULE_DESCRIPTION("board driver for am200 metronome epd kit"); | ||
| MODULE_AUTHOR("Jaya Kumar"); | ||
| MODULE_LICENSE("GPL"); |
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