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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * work_92105 display support
- *
- * (C) Copyright 2014 DENX Software Engineering GmbH
- * Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr>
- *
- * The work_92105 display is a HD44780-compatible module
- * controlled through a MAX6957AAX SPI port expander, two
- * MAX518 I2C DACs and native LPC32xx GPO 15.
- */
- #include <common.h>
- #include <command.h>
- #include <log.h>
- #include <asm/arch/sys_proto.h>
- #include <asm/arch/cpu.h>
- #include <asm/arch/emc.h>
- #include <asm/gpio.h>
- #include <env.h>
- #include <spi.h>
- #include <i2c.h>
- #include <version.h>
- #include <vsprintf.h>
- #include <linux/delay.h>
- /*
- * GPO 15 in port 3 is gpio 3*32+15 = 111
- */
- #define GPO_15 111
- /**
- * MAX6957AAX registers that we will be using
- */
- #define MAX6957_CONF 0x04
- #define MAX6957_CONF_08_11 0x0A
- #define MAX6957_CONF_12_15 0x0B
- #define MAX6957_CONF_16_19 0x0C
- /**
- * Individual gpio ports (one per gpio) to HD44780
- */
- #define MAX6957AAX_HD44780_RS 0x29
- #define MAX6957AAX_HD44780_R_W 0x2A
- #define MAX6957AAX_HD44780_EN 0x2B
- #define MAX6957AAX_HD44780_DATA 0x4C
- /**
- * Display controller instructions
- */
- /* Function set: eight bits, two lines, 8-dot font */
- #define HD44780_FUNCTION_SET 0x38
- /* Display ON / OFF: turn display on */
- #define HD44780_DISPLAY_ON_OFF_CONTROL 0x0C
- /* Entry mode: increment */
- #define HD44780_ENTRY_MODE_SET 0x06
- /* Clear */
- #define HD44780_CLEAR_DISPLAY 0x01
- /* Set DDRAM addr (to be ORed with exact address) */
- #define HD44780_SET_DDRAM_ADDR 0x80
- /* Set CGRAM addr (to be ORed with exact address) */
- #define HD44780_SET_CGRAM_ADDR 0x40
- /**
- * Default value for contrats
- */
- #define CONTRAST_DEFAULT 25
- /**
- * Define slave as a module-wide local to save passing it around,
- * plus we will need it after init for the "hd44780" command.
- */
- static struct spi_slave *slave;
- /*
- * Write a value into a MAX6957AAX register.
- */
- static void max6957aax_write(uint8_t reg, uint8_t value)
- {
- uint8_t dout[2];
- dout[0] = reg;
- dout[1] = value;
- gpio_set_value(GPO_15, 0);
- /* do SPI read/write (passing din==dout is OK) */
- spi_xfer(slave, 16, dout, dout, SPI_XFER_BEGIN | SPI_XFER_END);
- gpio_set_value(GPO_15, 1);
- }
- /*
- * Read a value from a MAX6957AAX register.
- *
- * According to the MAX6957AAX datasheet, we should release the chip
- * select halfway through the read sequence, when the actual register
- * value is read; but the WORK_92105 hardware prevents the MAX6957AAX
- * SPI OUT from reaching the LPC32XX SIP MISO if chip is not selected.
- * so let's release the CS an hold it again while reading the result.
- */
- static uint8_t max6957aax_read(uint8_t reg)
- {
- uint8_t dout[2], din[2];
- /* send read command */
- dout[0] = reg | 0x80; /* set bit 7 to indicate read */
- dout[1] = 0;
- gpio_set_value(GPO_15, 0);
- /* do SPI read/write (passing din==dout is OK) */
- spi_xfer(slave, 16, dout, dout, SPI_XFER_BEGIN | SPI_XFER_END);
- /* latch read command */
- gpio_set_value(GPO_15, 1);
- /* read register -- din = noop on xmit, din[1] = reg on recv */
- din[0] = 0;
- din[1] = 0;
- gpio_set_value(GPO_15, 0);
- /* do SPI read/write (passing din==dout is OK) */
- spi_xfer(slave, 16, din, din, SPI_XFER_BEGIN | SPI_XFER_END);
- /* end of read. */
- gpio_set_value(GPO_15, 1);
- return din[1];
- }
- static void hd44780_instruction(unsigned long instruction)
- {
- max6957aax_write(MAX6957AAX_HD44780_RS, 0);
- max6957aax_write(MAX6957AAX_HD44780_R_W, 0);
- max6957aax_write(MAX6957AAX_HD44780_EN, 1);
- max6957aax_write(MAX6957AAX_HD44780_DATA, instruction);
- max6957aax_write(MAX6957AAX_HD44780_EN, 0);
- /* HD44780 takes 37 us for most instructions, 1520 for clear */
- if (instruction == HD44780_CLEAR_DISPLAY)
- udelay(2000);
- else
- udelay(100);
- }
- static void hd44780_write_char(char c)
- {
- max6957aax_write(MAX6957AAX_HD44780_RS, 1);
- max6957aax_write(MAX6957AAX_HD44780_R_W, 0);
- max6957aax_write(MAX6957AAX_HD44780_EN, 1);
- max6957aax_write(MAX6957AAX_HD44780_DATA, c);
- max6957aax_write(MAX6957AAX_HD44780_EN, 0);
- /* HD44780 takes 37 us to write to DDRAM or CGRAM */
- udelay(100);
- }
- static void hd44780_write_str(char *s)
- {
- max6957aax_write(MAX6957AAX_HD44780_RS, 1);
- max6957aax_write(MAX6957AAX_HD44780_R_W, 0);
- while (*s) {
- max6957aax_write(MAX6957AAX_HD44780_EN, 1);
- max6957aax_write(MAX6957AAX_HD44780_DATA, *s);
- max6957aax_write(MAX6957AAX_HD44780_EN, 0);
- s++;
- /* HD44780 takes 37 us to write to DDRAM or CGRAM */
- udelay(100);
- }
- }
- /*
- * Existing user code might expect these custom characters to be
- * recognized and displayed on the LCD
- */
- static u8 char_gen_chars[] = {
- /* #8, empty rectangle */
- 0x1F, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1F,
- /* #9, filled right arrow */
- 0x10, 0x18, 0x1C, 0x1E, 0x1C, 0x18, 0x10, 0x00,
- /* #10, filled left arrow */
- 0x01, 0x03, 0x07, 0x0F, 0x07, 0x03, 0x01, 0x00,
- /* #11, up and down arrow */
- 0x04, 0x0E, 0x1F, 0x00, 0x00, 0x1F, 0x0E, 0x04,
- /* #12, plus/minus */
- 0x04, 0x04, 0x1F, 0x04, 0x04, 0x00, 0x1F, 0x00,
- /* #13, fat exclamation mark */
- 0x06, 0x06, 0x06, 0x06, 0x00, 0x06, 0x06, 0x00,
- /* #14, empty square */
- 0x00, 0x1F, 0x11, 0x11, 0x11, 0x1F, 0x00, 0x00,
- /* #15, struck out square */
- 0x00, 0x1F, 0x19, 0x15, 0x13, 0x1F, 0x00, 0x00,
- };
- static void hd44780_init_char_gen(void)
- {
- int i;
- hd44780_instruction(HD44780_SET_CGRAM_ADDR);
- for (i = 0; i < sizeof(char_gen_chars); i++)
- hd44780_write_char(char_gen_chars[i]);
- hd44780_instruction(HD44780_SET_DDRAM_ADDR);
- }
- void work_92105_display_init(void)
- {
- int claim_err;
- char *display_contrast_str;
- uint8_t display_contrast = CONTRAST_DEFAULT;
- uint8_t enable_backlight = 0x96;
- slave = spi_setup_slave(0, 0, 500000, 0);
- if (!slave) {
- printf("Failed to set up SPI slave\n");
- return;
- }
- claim_err = spi_claim_bus(slave);
- if (claim_err)
- debug("Failed to claim SPI bus: %d\n", claim_err);
- /* enable backlight */
- i2c_write(0x2c, 0x01, 1, &enable_backlight, 1);
- /* set display contrast */
- display_contrast_str = env_get("fwopt_dispcontrast");
- if (display_contrast_str)
- display_contrast = dectoul(display_contrast_str, NULL);
- i2c_write(0x2c, 0x00, 1, &display_contrast, 1);
- /* request GPO_15 as an output initially set to 1 */
- gpio_request(GPO_15, "MAX6957_nCS");
- gpio_direction_output(GPO_15, 1);
- /* enable MAX6957 portexpander */
- max6957aax_write(MAX6957_CONF, 0x01);
- /* configure pin 8 as input, pins 9..19 as outputs */
- max6957aax_write(MAX6957_CONF_08_11, 0x56);
- max6957aax_write(MAX6957_CONF_12_15, 0x55);
- max6957aax_write(MAX6957_CONF_16_19, 0x55);
- /* initialize HD44780 */
- max6957aax_write(MAX6957AAX_HD44780_EN, 0);
- hd44780_instruction(HD44780_FUNCTION_SET);
- hd44780_instruction(HD44780_DISPLAY_ON_OFF_CONTROL);
- hd44780_instruction(HD44780_ENTRY_MODE_SET);
- /* write custom character glyphs */
- hd44780_init_char_gen();
- /* Show U-Boot version, date and time as a sign-of-life */
- hd44780_instruction(HD44780_CLEAR_DISPLAY);
- hd44780_instruction(HD44780_SET_DDRAM_ADDR | 0);
- hd44780_write_str(U_BOOT_VERSION);
- hd44780_instruction(HD44780_SET_DDRAM_ADDR | 64);
- hd44780_write_str(U_BOOT_DATE);
- hd44780_instruction(HD44780_SET_DDRAM_ADDR | 64 | 20);
- hd44780_write_str(U_BOOT_TIME);
- }
- #ifdef CONFIG_CMD_MAX6957
- static int do_max6957aax(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- int reg, val;
- if (argc != 3)
- return CMD_RET_USAGE;
- switch (argv[1][0]) {
- case 'r':
- case 'R':
- reg = simple_strtoul(argv[2], NULL, 0);
- val = max6957aax_read(reg);
- printf("MAX6957 reg 0x%02x read 0x%02x\n", reg, val);
- return 0;
- default:
- reg = simple_strtoul(argv[1], NULL, 0);
- val = simple_strtoul(argv[2], NULL, 0);
- max6957aax_write(reg, val);
- printf("MAX6957 reg 0x%02x wrote 0x%02x\n", reg, val);
- return 0;
- }
- return 1;
- }
- #ifdef CONFIG_SYS_LONGHELP
- static char max6957aax_help_text[] =
- "max6957aax - write or read display register:\n"
- "\tmax6957aax R|r reg - read display register;\n"
- "\tmax6957aax reg val - write display register.";
- #endif
- U_BOOT_CMD(
- max6957aax, 6, 1, do_max6957aax,
- "SPI MAX6957 display write/read",
- max6957aax_help_text
- );
- #endif /* CONFIG_CMD_MAX6957 */
- #ifdef CONFIG_CMD_HD44760
- /*
- * We need the HUSH parser because we need string arguments, and
- * only HUSH can understand them.
- */
- #if !defined(CONFIG_HUSH_PARSER)
- #error CONFIG_CMD_HD44760 requires CONFIG_HUSH_PARSER
- #endif
- static int do_hd44780(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- char *cmd;
- if (argc != 3)
- return CMD_RET_USAGE;
- cmd = argv[1];
- if (strcasecmp(cmd, "cmd") == 0)
- hd44780_instruction(simple_strtol(argv[2], NULL, 0));
- else if (strcasecmp(cmd, "data") == 0)
- hd44780_write_char(simple_strtol(argv[2], NULL, 0));
- else if (strcasecmp(cmd, "str") == 0)
- hd44780_write_str(argv[2]);
- return 0;
- }
- #ifdef CONFIG_SYS_LONGHELP
- static char hd44780_help_text[] =
- "hd44780 - control LCD driver:\n"
- "\thd44780 cmd <val> - send command <val> to driver;\n"
- "\thd44780 data <val> - send data <val> to driver;\n"
- "\thd44780 str \"<text>\" - send \"<text>\" to driver.";
- #endif
- U_BOOT_CMD(
- hd44780, 6, 1, do_hd44780,
- "HD44780 LCD driver control",
- hd44780_help_text
- );
- #endif /* CONFIG_CMD_HD44760 */
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