From 00846a4425d373761c70cbe82cceb98d3d4da179 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Tue, 4 Apr 2017 20:25:22 +0300 Subject: auxdisplay: Move arm-charlcd.c to drivers/auxdisplay folder It looks like arm-charlcd.c belongs to auxdisplay subsystem. Move it to drivers/auxdisplay folder. No functional changes intended. Reviewed-by: Linus Walleij Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/auxdisplay/Kconfig | 10 ++ drivers/auxdisplay/Makefile | 1 + drivers/auxdisplay/arm-charlcd.c | 368 +++++++++++++++++++++++++++++++++++++++ drivers/misc/Kconfig | 10 -- drivers/misc/Makefile | 1 - drivers/misc/arm-charlcd.c | 368 --------------------------------------- 6 files changed, 379 insertions(+), 379 deletions(-) create mode 100644 drivers/auxdisplay/arm-charlcd.c delete mode 100644 drivers/misc/arm-charlcd.c diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index ad83a0598c67..9ae6681c90ad 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -157,6 +157,16 @@ config HT16K33 endif # AUXDISPLAY +config ARM_CHARLCD + bool "ARM Ltd. Character LCD Driver" + depends on PLAT_VERSATILE + help + This is a driver for the character LCD found on the ARM Ltd. + Versatile and RealView Platform Baseboards. It doesn't do + very much more than display the text "ARM Linux" on the first + line and the Linux version on the second line, but that's + still useful. + config PANEL tristate "Parallel port LCD/Keypad Panel support" depends on PARPORT diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile index 58c25e5ece84..2b8af3dc5e42 100644 --- a/drivers/auxdisplay/Makefile +++ b/drivers/auxdisplay/Makefile @@ -3,6 +3,7 @@ # obj-$(CONFIG_CHARLCD) += charlcd.o +obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o obj-$(CONFIG_KS0108) += ks0108.o obj-$(CONFIG_CFAG12864B) += cfag12864b.o cfag12864bfb.o obj-$(CONFIG_IMG_ASCII_LCD) += img-ascii-lcd.o diff --git a/drivers/auxdisplay/arm-charlcd.c b/drivers/auxdisplay/arm-charlcd.c new file mode 100644 index 000000000000..b3176ee92b90 --- /dev/null +++ b/drivers/auxdisplay/arm-charlcd.c @@ -0,0 +1,368 @@ +/* + * Driver for the on-board character LCD found on some ARM reference boards + * This is basically an Hitachi HD44780 LCD with a custom IP block to drive it + * http://en.wikipedia.org/wiki/HD44780_Character_LCD + * Currently it will just display the text "ARM Linux" and the linux version + * + * License terms: GNU General Public License (GPL) version 2 + * Author: Linus Walleij + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRIVERNAME "arm-charlcd" +#define CHARLCD_TIMEOUT (msecs_to_jiffies(1000)) + +/* Offsets to registers */ +#define CHAR_COM 0x00U +#define CHAR_DAT 0x04U +#define CHAR_RD 0x08U +#define CHAR_RAW 0x0CU +#define CHAR_MASK 0x10U +#define CHAR_STAT 0x14U + +#define CHAR_RAW_CLEAR 0x00000000U +#define CHAR_RAW_VALID 0x00000100U + +/* Hitachi HD44780 display commands */ +#define HD_CLEAR 0x01U +#define HD_HOME 0x02U +#define HD_ENTRYMODE 0x04U +#define HD_ENTRYMODE_INCREMENT 0x02U +#define HD_ENTRYMODE_SHIFT 0x01U +#define HD_DISPCTRL 0x08U +#define HD_DISPCTRL_ON 0x04U +#define HD_DISPCTRL_CURSOR_ON 0x02U +#define HD_DISPCTRL_CURSOR_BLINK 0x01U +#define HD_CRSR_SHIFT 0x10U +#define HD_CRSR_SHIFT_DISPLAY 0x08U +#define HD_CRSR_SHIFT_DISPLAY_RIGHT 0x04U +#define HD_FUNCSET 0x20U +#define HD_FUNCSET_8BIT 0x10U +#define HD_FUNCSET_2_LINES 0x08U +#define HD_FUNCSET_FONT_5X10 0x04U +#define HD_SET_CGRAM 0x40U +#define HD_SET_DDRAM 0x80U +#define HD_BUSY_FLAG 0x80U + +/** + * @dev: a pointer back to containing device + * @phybase: the offset to the controller in physical memory + * @physize: the size of the physical page + * @virtbase: the offset to the controller in virtual memory + * @irq: reserved interrupt number + * @complete: completion structure for the last LCD command + */ +struct charlcd { + struct device *dev; + u32 phybase; + u32 physize; + void __iomem *virtbase; + int irq; + struct completion complete; + struct delayed_work init_work; +}; + +static irqreturn_t charlcd_interrupt(int irq, void *data) +{ + struct charlcd *lcd = data; + u8 status; + + status = readl(lcd->virtbase + CHAR_STAT) & 0x01; + /* Clear IRQ */ + writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); + if (status) + complete(&lcd->complete); + else + dev_info(lcd->dev, "Spurious IRQ (%02x)\n", status); + return IRQ_HANDLED; +} + + +static void charlcd_wait_complete_irq(struct charlcd *lcd) +{ + int ret; + + ret = wait_for_completion_interruptible_timeout(&lcd->complete, + CHARLCD_TIMEOUT); + /* Disable IRQ after completion */ + writel(0x00, lcd->virtbase + CHAR_MASK); + + if (ret < 0) { + dev_err(lcd->dev, + "wait_for_completion_interruptible_timeout() " + "returned %d waiting for ready\n", ret); + return; + } + + if (ret == 0) { + dev_err(lcd->dev, "charlcd controller timed out " + "waiting for ready\n"); + return; + } +} + +static u8 charlcd_4bit_read_char(struct charlcd *lcd) +{ + u8 data; + u32 val; + int i; + + /* If we can, use an IRQ to wait for the data, else poll */ + if (lcd->irq >= 0) + charlcd_wait_complete_irq(lcd); + else { + i = 0; + val = 0; + while (!(val & CHAR_RAW_VALID) && i < 10) { + udelay(100); + val = readl(lcd->virtbase + CHAR_RAW); + i++; + } + + writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); + } + msleep(1); + + /* Read the 4 high bits of the data */ + data = readl(lcd->virtbase + CHAR_RD) & 0xf0; + + /* + * The second read for the low bits does not trigger an IRQ + * so in this case we have to poll for the 4 lower bits + */ + i = 0; + val = 0; + while (!(val & CHAR_RAW_VALID) && i < 10) { + udelay(100); + val = readl(lcd->virtbase + CHAR_RAW); + i++; + } + writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); + msleep(1); + + /* Read the 4 low bits of the data */ + data |= (readl(lcd->virtbase + CHAR_RD) >> 4) & 0x0f; + + return data; +} + +static bool charlcd_4bit_read_bf(struct charlcd *lcd) +{ + if (lcd->irq >= 0) { + /* + * If we'll use IRQs to wait for the busyflag, clear any + * pending flag and enable IRQ + */ + writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); + init_completion(&lcd->complete); + writel(0x01, lcd->virtbase + CHAR_MASK); + } + readl(lcd->virtbase + CHAR_COM); + return charlcd_4bit_read_char(lcd) & HD_BUSY_FLAG ? true : false; +} + +static void charlcd_4bit_wait_busy(struct charlcd *lcd) +{ + int retries = 50; + + udelay(100); + while (charlcd_4bit_read_bf(lcd) && retries) + retries--; + if (!retries) + dev_err(lcd->dev, "timeout waiting for busyflag\n"); +} + +static void charlcd_4bit_command(struct charlcd *lcd, u8 cmd) +{ + u32 cmdlo = (cmd << 4) & 0xf0; + u32 cmdhi = (cmd & 0xf0); + + writel(cmdhi, lcd->virtbase + CHAR_COM); + udelay(10); + writel(cmdlo, lcd->virtbase + CHAR_COM); + charlcd_4bit_wait_busy(lcd); +} + +static void charlcd_4bit_char(struct charlcd *lcd, u8 ch) +{ + u32 chlo = (ch << 4) & 0xf0; + u32 chhi = (ch & 0xf0); + + writel(chhi, lcd->virtbase + CHAR_DAT); + udelay(10); + writel(chlo, lcd->virtbase + CHAR_DAT); + charlcd_4bit_wait_busy(lcd); +} + +static void charlcd_4bit_print(struct charlcd *lcd, int line, const char *str) +{ + u8 offset; + int i; + + /* + * We support line 0, 1 + * Line 1 runs from 0x00..0x27 + * Line 2 runs from 0x28..0x4f + */ + if (line == 0) + offset = 0; + else if (line == 1) + offset = 0x28; + else + return; + + /* Set offset */ + charlcd_4bit_command(lcd, HD_SET_DDRAM | offset); + + /* Send string */ + for (i = 0; i < strlen(str) && i < 0x28; i++) + charlcd_4bit_char(lcd, str[i]); +} + +static void charlcd_4bit_init(struct charlcd *lcd) +{ + /* These commands cannot be checked with the busy flag */ + writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); + msleep(5); + writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); + udelay(100); + writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); + udelay(100); + /* Go to 4bit mode */ + writel(HD_FUNCSET, lcd->virtbase + CHAR_COM); + udelay(100); + /* + * 4bit mode, 2 lines, 5x8 font, after this the number of lines + * and the font cannot be changed until the next initialization sequence + */ + charlcd_4bit_command(lcd, HD_FUNCSET | HD_FUNCSET_2_LINES); + charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON); + charlcd_4bit_command(lcd, HD_ENTRYMODE | HD_ENTRYMODE_INCREMENT); + charlcd_4bit_command(lcd, HD_CLEAR); + charlcd_4bit_command(lcd, HD_HOME); + /* Put something useful in the display */ + charlcd_4bit_print(lcd, 0, "ARM Linux"); + charlcd_4bit_print(lcd, 1, UTS_RELEASE); +} + +static void charlcd_init_work(struct work_struct *work) +{ + struct charlcd *lcd = + container_of(work, struct charlcd, init_work.work); + + charlcd_4bit_init(lcd); +} + +static int __init charlcd_probe(struct platform_device *pdev) +{ + int ret; + struct charlcd *lcd; + struct resource *res; + + lcd = kzalloc(sizeof(struct charlcd), GFP_KERNEL); + if (!lcd) + return -ENOMEM; + + lcd->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENOENT; + goto out_no_resource; + } + lcd->phybase = res->start; + lcd->physize = resource_size(res); + + if (request_mem_region(lcd->phybase, lcd->physize, + DRIVERNAME) == NULL) { + ret = -EBUSY; + goto out_no_memregion; + } + + lcd->virtbase = ioremap(lcd->phybase, lcd->physize); + if (!lcd->virtbase) { + ret = -ENOMEM; + goto out_no_memregion; + } + + lcd->irq = platform_get_irq(pdev, 0); + /* If no IRQ is supplied, we'll survive without it */ + if (lcd->irq >= 0) { + if (request_irq(lcd->irq, charlcd_interrupt, 0, + DRIVERNAME, lcd)) { + ret = -EIO; + goto out_no_irq; + } + } + + platform_set_drvdata(pdev, lcd); + + /* + * Initialize the display in a delayed work, because + * it is VERY slow and would slow down the boot of the system. + */ + INIT_DELAYED_WORK(&lcd->init_work, charlcd_init_work); + schedule_delayed_work(&lcd->init_work, 0); + + dev_info(&pdev->dev, "initialized ARM character LCD at %08x\n", + lcd->phybase); + + return 0; + +out_no_irq: + iounmap(lcd->virtbase); +out_no_memregion: + release_mem_region(lcd->phybase, SZ_4K); +out_no_resource: + kfree(lcd); + return ret; +} + +static int charlcd_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct charlcd *lcd = platform_get_drvdata(pdev); + + /* Power the display off */ + charlcd_4bit_command(lcd, HD_DISPCTRL); + return 0; +} + +static int charlcd_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct charlcd *lcd = platform_get_drvdata(pdev); + + /* Turn the display back on */ + charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON); + return 0; +} + +static const struct dev_pm_ops charlcd_pm_ops = { + .suspend = charlcd_suspend, + .resume = charlcd_resume, +}; + +static const struct of_device_id charlcd_match[] = { + { .compatible = "arm,versatile-lcd", }, + {} +}; + +static struct platform_driver charlcd_driver = { + .driver = { + .name = DRIVERNAME, + .pm = &charlcd_pm_ops, + .suppress_bind_attrs = true, + .of_match_table = of_match_ptr(charlcd_match), + }, +}; +builtin_platform_driver_probe(charlcd_driver, charlcd_probe); diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 2438466c15ac..39d1acb27452 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -419,16 +419,6 @@ config VMWARE_BALLOON To compile this driver as a module, choose M here: the module will be called vmw_balloon. -config ARM_CHARLCD - bool "ARM Ltd. Character LCD Driver" - depends on PLAT_VERSATILE - help - This is a driver for the character LCD found on the ARM Ltd. - Versatile and RealView Platform Baseboards. It doesn't do - very much more than display the text "ARM Linux" on the first - line and the Linux version on the second line, but that's - still useful. - config PCH_PHUB tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) PHUB" select GENERIC_NET_UTILS diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 9a9f7e72aa54..4c4d6dc03181 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -37,7 +37,6 @@ obj-y += eeprom/ obj-y += cb710/ obj-$(CONFIG_SPEAR13XX_PCIE_GADGET) += spear13xx_pcie_gadget.o obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o -obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o obj-$(CONFIG_PCH_PHUB) += pch_phub.o obj-y += ti-st/ obj-y += lis3lv02d/ diff --git a/drivers/misc/arm-charlcd.c b/drivers/misc/arm-charlcd.c deleted file mode 100644 index b3176ee92b90..000000000000 --- a/drivers/misc/arm-charlcd.c +++ /dev/null @@ -1,368 +0,0 @@ -/* - * Driver for the on-board character LCD found on some ARM reference boards - * This is basically an Hitachi HD44780 LCD with a custom IP block to drive it - * http://en.wikipedia.org/wiki/HD44780_Character_LCD - * Currently it will just display the text "ARM Linux" and the linux version - * - * License terms: GNU General Public License (GPL) version 2 - * Author: Linus Walleij - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define DRIVERNAME "arm-charlcd" -#define CHARLCD_TIMEOUT (msecs_to_jiffies(1000)) - -/* Offsets to registers */ -#define CHAR_COM 0x00U -#define CHAR_DAT 0x04U -#define CHAR_RD 0x08U -#define CHAR_RAW 0x0CU -#define CHAR_MASK 0x10U -#define CHAR_STAT 0x14U - -#define CHAR_RAW_CLEAR 0x00000000U -#define CHAR_RAW_VALID 0x00000100U - -/* Hitachi HD44780 display commands */ -#define HD_CLEAR 0x01U -#define HD_HOME 0x02U -#define HD_ENTRYMODE 0x04U -#define HD_ENTRYMODE_INCREMENT 0x02U -#define HD_ENTRYMODE_SHIFT 0x01U -#define HD_DISPCTRL 0x08U -#define HD_DISPCTRL_ON 0x04U -#define HD_DISPCTRL_CURSOR_ON 0x02U -#define HD_DISPCTRL_CURSOR_BLINK 0x01U -#define HD_CRSR_SHIFT 0x10U -#define HD_CRSR_SHIFT_DISPLAY 0x08U -#define HD_CRSR_SHIFT_DISPLAY_RIGHT 0x04U -#define HD_FUNCSET 0x20U -#define HD_FUNCSET_8BIT 0x10U -#define HD_FUNCSET_2_LINES 0x08U -#define HD_FUNCSET_FONT_5X10 0x04U -#define HD_SET_CGRAM 0x40U -#define HD_SET_DDRAM 0x80U -#define HD_BUSY_FLAG 0x80U - -/** - * @dev: a pointer back to containing device - * @phybase: the offset to the controller in physical memory - * @physize: the size of the physical page - * @virtbase: the offset to the controller in virtual memory - * @irq: reserved interrupt number - * @complete: completion structure for the last LCD command - */ -struct charlcd { - struct device *dev; - u32 phybase; - u32 physize; - void __iomem *virtbase; - int irq; - struct completion complete; - struct delayed_work init_work; -}; - -static irqreturn_t charlcd_interrupt(int irq, void *data) -{ - struct charlcd *lcd = data; - u8 status; - - status = readl(lcd->virtbase + CHAR_STAT) & 0x01; - /* Clear IRQ */ - writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); - if (status) - complete(&lcd->complete); - else - dev_info(lcd->dev, "Spurious IRQ (%02x)\n", status); - return IRQ_HANDLED; -} - - -static void charlcd_wait_complete_irq(struct charlcd *lcd) -{ - int ret; - - ret = wait_for_completion_interruptible_timeout(&lcd->complete, - CHARLCD_TIMEOUT); - /* Disable IRQ after completion */ - writel(0x00, lcd->virtbase + CHAR_MASK); - - if (ret < 0) { - dev_err(lcd->dev, - "wait_for_completion_interruptible_timeout() " - "returned %d waiting for ready\n", ret); - return; - } - - if (ret == 0) { - dev_err(lcd->dev, "charlcd controller timed out " - "waiting for ready\n"); - return; - } -} - -static u8 charlcd_4bit_read_char(struct charlcd *lcd) -{ - u8 data; - u32 val; - int i; - - /* If we can, use an IRQ to wait for the data, else poll */ - if (lcd->irq >= 0) - charlcd_wait_complete_irq(lcd); - else { - i = 0; - val = 0; - while (!(val & CHAR_RAW_VALID) && i < 10) { - udelay(100); - val = readl(lcd->virtbase + CHAR_RAW); - i++; - } - - writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); - } - msleep(1); - - /* Read the 4 high bits of the data */ - data = readl(lcd->virtbase + CHAR_RD) & 0xf0; - - /* - * The second read for the low bits does not trigger an IRQ - * so in this case we have to poll for the 4 lower bits - */ - i = 0; - val = 0; - while (!(val & CHAR_RAW_VALID) && i < 10) { - udelay(100); - val = readl(lcd->virtbase + CHAR_RAW); - i++; - } - writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); - msleep(1); - - /* Read the 4 low bits of the data */ - data |= (readl(lcd->virtbase + CHAR_RD) >> 4) & 0x0f; - - return data; -} - -static bool charlcd_4bit_read_bf(struct charlcd *lcd) -{ - if (lcd->irq >= 0) { - /* - * If we'll use IRQs to wait for the busyflag, clear any - * pending flag and enable IRQ - */ - writel(CHAR_RAW_CLEAR, lcd->virtbase + CHAR_RAW); - init_completion(&lcd->complete); - writel(0x01, lcd->virtbase + CHAR_MASK); - } - readl(lcd->virtbase + CHAR_COM); - return charlcd_4bit_read_char(lcd) & HD_BUSY_FLAG ? true : false; -} - -static void charlcd_4bit_wait_busy(struct charlcd *lcd) -{ - int retries = 50; - - udelay(100); - while (charlcd_4bit_read_bf(lcd) && retries) - retries--; - if (!retries) - dev_err(lcd->dev, "timeout waiting for busyflag\n"); -} - -static void charlcd_4bit_command(struct charlcd *lcd, u8 cmd) -{ - u32 cmdlo = (cmd << 4) & 0xf0; - u32 cmdhi = (cmd & 0xf0); - - writel(cmdhi, lcd->virtbase + CHAR_COM); - udelay(10); - writel(cmdlo, lcd->virtbase + CHAR_COM); - charlcd_4bit_wait_busy(lcd); -} - -static void charlcd_4bit_char(struct charlcd *lcd, u8 ch) -{ - u32 chlo = (ch << 4) & 0xf0; - u32 chhi = (ch & 0xf0); - - writel(chhi, lcd->virtbase + CHAR_DAT); - udelay(10); - writel(chlo, lcd->virtbase + CHAR_DAT); - charlcd_4bit_wait_busy(lcd); -} - -static void charlcd_4bit_print(struct charlcd *lcd, int line, const char *str) -{ - u8 offset; - int i; - - /* - * We support line 0, 1 - * Line 1 runs from 0x00..0x27 - * Line 2 runs from 0x28..0x4f - */ - if (line == 0) - offset = 0; - else if (line == 1) - offset = 0x28; - else - return; - - /* Set offset */ - charlcd_4bit_command(lcd, HD_SET_DDRAM | offset); - - /* Send string */ - for (i = 0; i < strlen(str) && i < 0x28; i++) - charlcd_4bit_char(lcd, str[i]); -} - -static void charlcd_4bit_init(struct charlcd *lcd) -{ - /* These commands cannot be checked with the busy flag */ - writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); - msleep(5); - writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); - udelay(100); - writel(HD_FUNCSET | HD_FUNCSET_8BIT, lcd->virtbase + CHAR_COM); - udelay(100); - /* Go to 4bit mode */ - writel(HD_FUNCSET, lcd->virtbase + CHAR_COM); - udelay(100); - /* - * 4bit mode, 2 lines, 5x8 font, after this the number of lines - * and the font cannot be changed until the next initialization sequence - */ - charlcd_4bit_command(lcd, HD_FUNCSET | HD_FUNCSET_2_LINES); - charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON); - charlcd_4bit_command(lcd, HD_ENTRYMODE | HD_ENTRYMODE_INCREMENT); - charlcd_4bit_command(lcd, HD_CLEAR); - charlcd_4bit_command(lcd, HD_HOME); - /* Put something useful in the display */ - charlcd_4bit_print(lcd, 0, "ARM Linux"); - charlcd_4bit_print(lcd, 1, UTS_RELEASE); -} - -static void charlcd_init_work(struct work_struct *work) -{ - struct charlcd *lcd = - container_of(work, struct charlcd, init_work.work); - - charlcd_4bit_init(lcd); -} - -static int __init charlcd_probe(struct platform_device *pdev) -{ - int ret; - struct charlcd *lcd; - struct resource *res; - - lcd = kzalloc(sizeof(struct charlcd), GFP_KERNEL); - if (!lcd) - return -ENOMEM; - - lcd->dev = &pdev->dev; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - ret = -ENOENT; - goto out_no_resource; - } - lcd->phybase = res->start; - lcd->physize = resource_size(res); - - if (request_mem_region(lcd->phybase, lcd->physize, - DRIVERNAME) == NULL) { - ret = -EBUSY; - goto out_no_memregion; - } - - lcd->virtbase = ioremap(lcd->phybase, lcd->physize); - if (!lcd->virtbase) { - ret = -ENOMEM; - goto out_no_memregion; - } - - lcd->irq = platform_get_irq(pdev, 0); - /* If no IRQ is supplied, we'll survive without it */ - if (lcd->irq >= 0) { - if (request_irq(lcd->irq, charlcd_interrupt, 0, - DRIVERNAME, lcd)) { - ret = -EIO; - goto out_no_irq; - } - } - - platform_set_drvdata(pdev, lcd); - - /* - * Initialize the display in a delayed work, because - * it is VERY slow and would slow down the boot of the system. - */ - INIT_DELAYED_WORK(&lcd->init_work, charlcd_init_work); - schedule_delayed_work(&lcd->init_work, 0); - - dev_info(&pdev->dev, "initialized ARM character LCD at %08x\n", - lcd->phybase); - - return 0; - -out_no_irq: - iounmap(lcd->virtbase); -out_no_memregion: - release_mem_region(lcd->phybase, SZ_4K); -out_no_resource: - kfree(lcd); - return ret; -} - -static int charlcd_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct charlcd *lcd = platform_get_drvdata(pdev); - - /* Power the display off */ - charlcd_4bit_command(lcd, HD_DISPCTRL); - return 0; -} - -static int charlcd_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct charlcd *lcd = platform_get_drvdata(pdev); - - /* Turn the display back on */ - charlcd_4bit_command(lcd, HD_DISPCTRL | HD_DISPCTRL_ON); - return 0; -} - -static const struct dev_pm_ops charlcd_pm_ops = { - .suspend = charlcd_suspend, - .resume = charlcd_resume, -}; - -static const struct of_device_id charlcd_match[] = { - { .compatible = "arm,versatile-lcd", }, - {} -}; - -static struct platform_driver charlcd_driver = { - .driver = { - .name = DRIVERNAME, - .pm = &charlcd_pm_ops, - .suppress_bind_attrs = true, - .of_match_table = of_match_ptr(charlcd_match), - }, -}; -builtin_platform_driver_probe(charlcd_driver, charlcd_probe); -- cgit v1.2.3