mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-31 14:28:52 +09:00
![Stefan Bosch](/assets/img/avatar_default.png)
Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01: - SPL not supported yet --> no spl-dir in arch/arm/cpu/armv7/s5p4418/. Appropriate line in Makefile removed. - cpu.c: '#include <cpu_func.h>' added. - arch/arm/cpu/armv7/s5p4418/u-boot.lds removed, is not required anylonger. - "obj-$(CONFIG_ARCH_NEXELL) += s5p-common/" added to arch/arm/cpu/armv7/Makefile since s5p-common/pwm.c is used instead of drivers/pwm/pwm-nexell.c. - s5p4418.dtsi: '#include "../../../include/generated/autoconf.h"' removed, is not necessary, error at out-of-tree building. '#ifdef CONFIG_CPU_NXP4330'-blocks (2x) removed. Some minor changes regarding mmc. 'u-boot,dm-pre-reloc' added to dp0 because of added DM_VIDEO support. - board/s5p4418/ renamed to board/friendlyarm/ - All s5p4418-boards except nanopi2 removed because there is no possibility to test the other boards. - Kconfig: Changes to have a structure like mach-bcm283x (RaspberryPi), e.g. "config ..." entries moved from/to other Kconfig. - "CONFIG_" removed from several s5p4418/nanopi2 specific defines because the appropriate values do not need to be configurable. - nanopi2/board.c: All getenv(), getenv_ulong(), setenv() and saveenv() renamed to env_get(), env_get_ulong(), env_set() and env_save(), respectively. MACH_TYPE_S5P4418 is not defined anymore, therefore appropriate code removed (not necessary for DT-kernels). - nanopi2/onewire.c: All crc8() renamed to crc8_ow() because crc8() is already defined in lib/crc8.c (with different parameters). - dts: "nexell,s5pxx18-i2c" used instead of "i2c-gpio", i2c0 and i2c1 added. gmac-, ehci- and dwc2otg-entries removed because the appropriate functionality is not supported yet. New mmc-property "mmcboost" added. s5p4418-pinctrl.dtsi: gmac-entries removed, mmc- and i2c-entries added. - '#ifdef CONFIG...' changed to 'if (IS_ENABLED(CONFIG...))' where possible (and similar). Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
308 lines
5.6 KiB
C
308 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) Guangzhou FriendlyARM Computer Tech. Co., Ltd.
|
|
* (http://www.friendlyarm.com)
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <common.h>
|
|
#include <errno.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <i2c.h>
|
|
#include <pwm.h>
|
|
|
|
#include <irq_func.h>
|
|
|
|
#include <asm/arch/nexell.h>
|
|
#include <asm/arch/nx_gpio.h>
|
|
|
|
#ifndef NSEC_PER_SEC
|
|
#define NSEC_PER_SEC 1000000000L
|
|
#endif
|
|
|
|
#define SAMPLE_BPS 9600
|
|
#define SAMPLE_IN_US 101 /* (1000000 / BPS) */
|
|
|
|
#define REQ_INFO 0x60U
|
|
#define REQ_BL 0x80U
|
|
|
|
#define BUS_I2C 0x18
|
|
#define ONEWIRE_I2C_BUS 2
|
|
#define ONEWIRE_I2C_ADDR 0x2f
|
|
|
|
static int bus_type = -1;
|
|
static int lcd_id = -1;
|
|
static unsigned short lcd_fwrev;
|
|
static int current_brightness = -1;
|
|
#ifdef CONFIG_DM_I2C
|
|
static struct udevice *i2c_dev;
|
|
#endif
|
|
|
|
/* debug */
|
|
#if (0)
|
|
#define DBGOUT(msg...) do { printf("onewire: " msg); } while (0)
|
|
#else
|
|
#define DBGOUT(msg...) do {} while (0)
|
|
#endif
|
|
|
|
/* based on web page from http://lfh1986.blogspot.com */
|
|
static unsigned char crc8_ow(unsigned int v, unsigned int len)
|
|
{
|
|
unsigned char crc = 0xACU;
|
|
|
|
while (len--) {
|
|
if ((crc & 0x80U) != 0) {
|
|
crc <<= 1;
|
|
crc ^= 0x7U;
|
|
} else {
|
|
crc <<= 1;
|
|
}
|
|
if ((v & (1U << 31)) != 0)
|
|
crc ^= 0x7U;
|
|
v <<= 1;
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
/* GPIO helpers */
|
|
#define __IO_GRP 2 /* GPIOC15 */
|
|
#define __IO_IDX 15
|
|
|
|
static inline void set_pin_as_input(void)
|
|
{
|
|
nx_gpio_set_output_enable(__IO_GRP, __IO_IDX, 0);
|
|
}
|
|
|
|
static inline void set_pin_as_output(void)
|
|
{
|
|
nx_gpio_set_output_enable(__IO_GRP, __IO_IDX, 1);
|
|
}
|
|
|
|
static inline void set_pin_value(int v)
|
|
{
|
|
nx_gpio_set_output_value(__IO_GRP, __IO_IDX, !!v);
|
|
}
|
|
|
|
static inline int get_pin_value(void)
|
|
{
|
|
return nx_gpio_get_input_value(__IO_GRP, __IO_IDX);
|
|
}
|
|
|
|
/* Timer helpers */
|
|
#define PWM_CH 3
|
|
#define PWM_TCON (PHY_BASEADDR_PWM + 0x08)
|
|
#define PWM_TCON_START (1 << 16)
|
|
#define PWM_TINT_CSTAT (PHY_BASEADDR_PWM + 0x44)
|
|
|
|
static int onewire_init_timer(void)
|
|
{
|
|
int period_ns = NSEC_PER_SEC / SAMPLE_BPS;
|
|
|
|
/* range: 1080~1970 */
|
|
period_ns -= 1525;
|
|
|
|
return pwm_config(PWM_CH, period_ns >> 1, period_ns);
|
|
}
|
|
|
|
static void wait_one_tick(void)
|
|
{
|
|
unsigned int tcon;
|
|
|
|
tcon = readl(PWM_TCON);
|
|
tcon |= PWM_TCON_START;
|
|
writel(tcon, PWM_TCON);
|
|
|
|
while (1) {
|
|
if (readl(PWM_TINT_CSTAT) & (1 << (5 + PWM_CH)))
|
|
break;
|
|
}
|
|
|
|
writel((1 << (5 + PWM_CH)), PWM_TINT_CSTAT);
|
|
|
|
tcon &= ~PWM_TCON_START;
|
|
writel(tcon, PWM_TCON);
|
|
}
|
|
|
|
/* Session handler */
|
|
static int onewire_session(unsigned char req, unsigned char res[])
|
|
{
|
|
unsigned int Req;
|
|
unsigned int *Res;
|
|
int ints = disable_interrupts();
|
|
int i;
|
|
int ret;
|
|
|
|
Req = (req << 24) | (crc8_ow(req << 24, 8) << 16);
|
|
Res = (unsigned int *)res;
|
|
|
|
set_pin_value(1);
|
|
set_pin_as_output();
|
|
for (i = 0; i < 60; i++)
|
|
wait_one_tick();
|
|
|
|
set_pin_value(0);
|
|
for (i = 0; i < 2; i++)
|
|
wait_one_tick();
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
int v = !!(Req & (1U << 31));
|
|
|
|
Req <<= 1;
|
|
set_pin_value(v);
|
|
wait_one_tick();
|
|
}
|
|
|
|
wait_one_tick();
|
|
set_pin_as_input();
|
|
wait_one_tick();
|
|
for (i = 0; i < 32; i++) {
|
|
(*Res) <<= 1;
|
|
(*Res) |= get_pin_value();
|
|
wait_one_tick();
|
|
}
|
|
set_pin_value(1);
|
|
set_pin_as_output();
|
|
|
|
if (ints)
|
|
enable_interrupts();
|
|
|
|
ret = crc8_ow(*Res, 24) == res[0];
|
|
DBGOUT("req = %02X, res = %02X%02X%02X%02X, ret = %d\n",
|
|
req, res[3], res[2], res[1], res[0], ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int onewire_i2c_do_request(unsigned char req, unsigned char *buf)
|
|
{
|
|
unsigned char tx[4];
|
|
int ret;
|
|
|
|
tx[0] = req;
|
|
tx[1] = crc8_ow(req << 24, 8);
|
|
|
|
#ifdef CONFIG_DM_I2C
|
|
if (dm_i2c_write(i2c_dev, 0, tx, 2))
|
|
return -EIO;
|
|
|
|
if (!buf)
|
|
return 0;
|
|
|
|
if (dm_i2c_read(i2c_dev, 0, buf, 4))
|
|
return -EIO;
|
|
#else
|
|
if (i2c_write(ONEWIRE_I2C_ADDR, 0, 0, tx, 2))
|
|
return -EIO;
|
|
|
|
if (!buf) /* NO READ */
|
|
return 0;
|
|
|
|
if (i2c_read(ONEWIRE_I2C_ADDR, 0, 0, buf, 4))
|
|
return -EIO;
|
|
#endif
|
|
|
|
ret = crc8_ow((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8), 24);
|
|
DBGOUT("req = %02X, res = %02X%02X%02X%02X, ret = %02x\n",
|
|
req, buf[0], buf[1], buf[2], buf[3], ret);
|
|
|
|
return (ret == buf[3]) ? 0 : -EIO;
|
|
}
|
|
|
|
static void onewire_i2c_init(void)
|
|
{
|
|
unsigned char buf[4];
|
|
int ret;
|
|
|
|
#ifdef CONFIG_DM_I2C
|
|
ret = i2c_get_chip_for_busnum(ONEWIRE_I2C_BUS,
|
|
ONEWIRE_I2C_ADDR, 0, &i2c_dev);
|
|
#else
|
|
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
i2c_set_bus_num(ONEWIRE_I2C_BUS);
|
|
|
|
ret = i2c_probe(ONEWIRE_I2C_ADDR);
|
|
#endif
|
|
if (ret)
|
|
return;
|
|
|
|
ret = onewire_i2c_do_request(REQ_INFO, buf);
|
|
if (!ret) {
|
|
lcd_id = buf[0];
|
|
lcd_fwrev = buf[1] * 0x100 + buf[2];
|
|
bus_type = BUS_I2C;
|
|
}
|
|
}
|
|
|
|
void onewire_init(void)
|
|
{
|
|
/* GPIO, Pull-off */
|
|
nx_gpio_set_pad_function(__IO_GRP, __IO_IDX, 1);
|
|
nx_gpio_set_pull_mode(__IO_GRP, __IO_IDX, 2);
|
|
|
|
onewire_init_timer();
|
|
onewire_i2c_init();
|
|
}
|
|
|
|
int onewire_get_info(unsigned char *lcd, unsigned short *fw_ver)
|
|
{
|
|
unsigned char res[4];
|
|
int i;
|
|
|
|
if (bus_type == BUS_I2C && lcd_id > 0) {
|
|
*lcd = lcd_id;
|
|
*fw_ver = lcd_fwrev;
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
if (onewire_session(REQ_INFO, res)) {
|
|
*lcd = res[3];
|
|
*fw_ver = res[2] * 0x100 + res[1];
|
|
lcd_id = *lcd;
|
|
DBGOUT("lcd = %d, fw_ver = %x\n", *lcd, *fw_ver);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* LCD unknown or not connected */
|
|
*lcd = 0;
|
|
*fw_ver = -1;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int onewire_get_lcd_id(void)
|
|
{
|
|
return lcd_id;
|
|
}
|
|
|
|
int onewire_set_backlight(int brightness)
|
|
{
|
|
unsigned char res[4];
|
|
int i;
|
|
|
|
if (brightness == current_brightness)
|
|
return 0;
|
|
|
|
if (brightness > 127)
|
|
brightness = 127;
|
|
else if (brightness < 0)
|
|
brightness = 0;
|
|
|
|
if (bus_type == BUS_I2C) {
|
|
onewire_i2c_do_request((REQ_BL | brightness), NULL);
|
|
current_brightness = brightness;
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
if (onewire_session((REQ_BL | brightness), res)) {
|
|
current_brightness = brightness;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|