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Merge branch 'master' of git://www.denx.de/git/u-boot-microblaze

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This commit is contained in:
Tom Rini
2016-04-13 12:53:11 -04:00
parent 3f8085e94a 58ed7f6693
commit 541c9be880
46 changed files with 3063 additions and 297 deletions
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7
drivers/gpio/Kconfig
View File

@@ -136,4 +136,11 @@ config MVEBU_GPIO
help
Say yes here to support Marvell MVEBU (Armada XP/38x) GPIOs.
config ZYNQ_GPIO
bool "Zynq GPIO driver"
depends on DM_GPIO && (ARCH_ZYNQ || ARCH_ZYNQMP)
default y
help
Supports GPIO access on Zynq SoC.
endmenu

4
drivers/gpio/pca953x.c
View File

@@ -217,7 +217,7 @@ int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
/* All commands but "device" require 'maxargs' arguments */
if (!c || !((argc == (c->maxargs)) ||
(((int)c->cmd == PCA953X_CMD_DEVICE) &&
(((long)c->cmd == PCA953X_CMD_DEVICE) &&
(argc == (c->maxargs - 1))))) {
return CMD_RET_USAGE;
}
@@ -230,7 +230,7 @@ int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if (argc > 3)
ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
switch ((int)c->cmd) {
switch ((long)c->cmd) {
#ifdef CONFIG_CMD_PCA953X_INFO
case PCA953X_CMD_INFO:
ret = pca953x_info(chip);

338
drivers/gpio/zynq_gpio.c
View File

@@ -13,6 +13,141 @@
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <dm.h>
#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
/* Maximum banks */
#define ZYNQ_GPIO_MAX_BANK 4
#define ZYNQ_GPIO_BANK0_NGPIO 32
#define ZYNQ_GPIO_BANK1_NGPIO 22
#define ZYNQ_GPIO_BANK2_NGPIO 32
#define ZYNQ_GPIO_BANK3_NGPIO 32
#define ZYNQ_GPIO_NR_GPIOS (ZYNQ_GPIO_BANK0_NGPIO + \
ZYNQ_GPIO_BANK1_NGPIO + \
ZYNQ_GPIO_BANK2_NGPIO + \
ZYNQ_GPIO_BANK3_NGPIO)
#define ZYNQMP_GPIO_MAX_BANK 6
#define ZYNQMP_GPIO_BANK0_NGPIO 26
#define ZYNQMP_GPIO_BANK1_NGPIO 26
#define ZYNQMP_GPIO_BANK2_NGPIO 26
#define ZYNQMP_GPIO_BANK3_NGPIO 32
#define ZYNQMP_GPIO_BANK4_NGPIO 32
#define ZYNQMP_GPIO_BANK5_NGPIO 32
#define ZYNQMP_GPIO_NR_GPIOS 174
#define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0
#define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK0_NGPIO - 1)
#define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK1_NGPIO - 1)
#define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK2_NGPIO - 1)
#define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK3_NGPIO - 1)
#define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK4_NGPIO - 1)
#define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK5_NGPIO - 1)
/* Register offsets for the GPIO device */
/* LSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK))
/* MSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK))
/* Data Register-RW */
#define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK))
/* Direction mode reg-RW */
#define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK))
/* Output enable reg-RW */
#define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK))
/* Interrupt mask reg-RO */
#define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK))
/* Interrupt enable reg-WO */
#define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK))
/* Interrupt disable reg-WO */
#define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK))
/* Interrupt status reg-RO */
#define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK))
/* Interrupt type reg-RW */
#define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK))
/* Interrupt polarity reg-RW */
#define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK))
/* Interrupt on any, reg-RW */
#define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK))
/* Disable all interrupts mask */
#define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF
/* Mid pin number of a bank */
#define ZYNQ_GPIO_MID_PIN_NUM 16
/* GPIO upper 16 bit mask */
#define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
struct zynq_gpio_privdata {
phys_addr_t base;
const struct zynq_platform_data *p_data;
};
/**
* struct zynq_platform_data - zynq gpio platform data structure
* @label: string to store in gpio->label
* @ngpio: max number of gpio pins
* @max_bank: maximum number of gpio banks
* @bank_min: this array represents bank's min pin
* @bank_max: this array represents bank's max pin
*/
struct zynq_platform_data {
const char *label;
u16 ngpio;
int max_bank;
int bank_min[ZYNQMP_GPIO_MAX_BANK];
int bank_max[ZYNQMP_GPIO_MAX_BANK];
};
static const struct zynq_platform_data zynqmp_gpio_def = {
.label = "zynqmp_gpio",
.ngpio = ZYNQMP_GPIO_NR_GPIOS,
.max_bank = ZYNQMP_GPIO_MAX_BANK,
.bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
.bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
.bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
.bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
.bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
.bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
.bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
.bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
.bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
.bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
.bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
.bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
};
static const struct zynq_platform_data zynq_gpio_def = {
.label = "zynq_gpio",
.ngpio = ZYNQ_GPIO_NR_GPIOS,
.max_bank = ZYNQ_GPIO_MAX_BANK,
.bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
.bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
.bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
.bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
.bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
.bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
.bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
.bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
};
/**
* zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
@@ -27,88 +162,71 @@
*/
static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
unsigned int *bank_num,
unsigned int *bank_pin_num)
unsigned int *bank_pin_num,
struct udevice *dev)
{
switch (pin_num) {
case ZYNQ_GPIO_BANK0_PIN_MIN ... ZYNQ_GPIO_BANK0_PIN_MAX:
*bank_num = 0;
*bank_pin_num = pin_num;
break;
case ZYNQ_GPIO_BANK1_PIN_MIN ... ZYNQ_GPIO_BANK1_PIN_MAX:
*bank_num = 1;
*bank_pin_num = pin_num - ZYNQ_GPIO_BANK1_PIN_MIN;
break;
case ZYNQ_GPIO_BANK2_PIN_MIN ... ZYNQ_GPIO_BANK2_PIN_MAX:
*bank_num = 2;
*bank_pin_num = pin_num - ZYNQ_GPIO_BANK2_PIN_MIN;
break;
case ZYNQ_GPIO_BANK3_PIN_MIN ... ZYNQ_GPIO_BANK3_PIN_MAX:
*bank_num = 3;
*bank_pin_num = pin_num - ZYNQ_GPIO_BANK3_PIN_MIN;
break;
default:
printf("invalid GPIO pin number: %u\n", pin_num);
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
int bank;
for (bank = 0; bank < priv->p_data->max_bank; bank++) {
if ((pin_num >= priv->p_data->bank_min[bank]) &&
(pin_num <= priv->p_data->bank_max[bank])) {
*bank_num = bank;
*bank_pin_num = pin_num -
priv->p_data->bank_min[bank];
return;
}
}
if (bank >= priv->p_data->max_bank) {
printf("Inavlid bank and pin num\n");
*bank_num = 0;
*bank_pin_num = 0;
break;
}
}
int gpio_is_valid(unsigned gpio)
static int gpio_is_valid(unsigned gpio, struct udevice *dev)
{
return (gpio >= 0) && (gpio < ZYNQ_GPIO_NR_GPIOS);
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
return (gpio >= 0) && (gpio < priv->p_data->ngpio);
}
static int check_gpio(unsigned gpio)
static int check_gpio(unsigned gpio, struct udevice *dev)
{
if (!gpio_is_valid(gpio)) {
if (!gpio_is_valid(gpio, dev)) {
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
return -1;
}
return 0;
}
/**
* gpio_get_value - Get the state of the specified pin of GPIO device
* @gpio: gpio pin number within the device
*
* This function reads the state of the specified pin of the GPIO device.
*
* Return: 0 if the pin is low, 1 if pin is high.
*/
int gpio_get_value(unsigned gpio)
static int zynq_gpio_get_value(struct udevice *dev, unsigned gpio)
{
u32 data;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio) < 0)
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
data = readl(ZYNQ_GPIO_BASE_ADDRESS +
data = readl(priv->base +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
return (data >> bank_pin_num) & 1;
}
/**
* gpio_set_value - Modify the value of the pin with specified value
* @gpio: gpio pin number within the device
* @value: value used to modify the value of the specified pin
*
* This function calculates the register offset (i.e to lower 16 bits or
* upper 16 bits) based on the given pin number and sets the value of a
* gpio pin to the specified value. The value is either 0 or non-zero.
*/
int gpio_set_value(unsigned gpio, int value)
static int zynq_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
{
unsigned int reg_offset, bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio) < 0)
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
/* only 16 data bits in bit maskable reg */
@@ -126,95 +244,127 @@ int gpio_set_value(unsigned gpio, int value)
value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
writel(value, ZYNQ_GPIO_BASE_ADDRESS + reg_offset);
writel(value, priv->base + reg_offset);
return 0;
}
/**
* gpio_direction_input - Set the direction of the specified GPIO pin as input
* @gpio: gpio pin number within the device
*
* This function uses the read-modify-write sequence to set the direction of
* the gpio pin as input.
*
* Return: -1 if invalid gpio specified, 0 if successul
*/
int gpio_direction_input(unsigned gpio)
static int zynq_gpio_direction_input(struct udevice *dev, unsigned gpio)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio) < 0)
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
/* bank 0 pins 7 and 8 are special and cannot be used as inputs */
if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
return -1;
/* clear the bit in direction mode reg to set the pin as input */
reg = readl(ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg &= ~BIT(bank_pin_num);
writel(reg, ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
return 0;
}
/**
* gpio_direction_output - Set the direction of the specified GPIO pin as output
* @gpio: gpio pin number within the device
* @value: value to be written to specified pin
*
* This function sets the direction of specified GPIO pin as output, configures
* the Output Enable register for the pin and uses zynq_gpio_set to set
* the value of the pin to the value specified.
*
* Return: 0 always
*/
int gpio_direction_output(unsigned gpio, int value)
static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
int value)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio) < 0)
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
/* set the GPIO pin as output */
reg = readl(ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel(reg, ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
/* configure the output enable reg for the pin */
reg = readl(ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
reg = readl(priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel(reg, ZYNQ_GPIO_BASE_ADDRESS + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
writel(reg, priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
/* set the state of the pin */
gpio_set_value(gpio, value);
return 0;
}
/**
* Request a gpio before using it.
*
* NOTE: Argument 'label' is unused.
*/
int gpio_request(unsigned gpio, const char *label)
static const struct dm_gpio_ops gpio_zynq_ops = {
.direction_input = zynq_gpio_direction_input,
.direction_output = zynq_gpio_direction_output,
.get_value = zynq_gpio_get_value,
.set_value = zynq_gpio_set_value,
};
static const struct udevice_id zynq_gpio_ids[] = {
{ .compatible = "xlnx,zynq-gpio-1.0",
.data = (ulong)&zynq_gpio_def},
{ .compatible = "xlnx,zynqmp-gpio-1.0",
.data = (ulong)&zynqmp_gpio_def},
{ }
};
static void zynq_gpio_getplat_data(struct udevice *dev)
{
if (check_gpio(gpio) < 0)
return -1;
const struct udevice_id *of_match = zynq_gpio_ids;
int ret;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
while (of_match->compatible) {
ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
of_match->compatible);
if (ret >= 0) {
priv->p_data =
(struct zynq_platform_data *)of_match->data;
break;
} else {
of_match++;
continue;
}
}
if (!priv->p_data)
printf("No Platform data found\n");
}
static int zynq_gpio_probe(struct udevice *dev)
{
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
zynq_gpio_getplat_data(dev);
if (priv->p_data)
uc_priv->gpio_count = priv->p_data->ngpio;
return 0;
}
/**
* Reset and free the gpio after using it.
*/
int gpio_free(unsigned gpio)
static int zynq_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
priv->base = dev_get_addr(dev);
return 0;
}
U_BOOT_DRIVER(gpio_zynq) = {
.name = "gpio_zynq",
.id = UCLASS_GPIO,
.ops = &gpio_zynq_ops,
.of_match = zynq_gpio_ids,
.ofdata_to_platdata = zynq_gpio_ofdata_to_platdata,
.probe = zynq_gpio_probe,
.priv_auto_alloc_size = sizeof(struct zynq_gpio_privdata),
};

7
drivers/i2c/Kconfig
View File

@@ -58,6 +58,13 @@ config DM_I2C_GPIO
bindings are supported.
Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
config SYS_I2C_CADENCE
tristate "Cadence I2C Controller"
depends on DM_I2C && (ARCH_ZYNQ || ARM64)
help
Say yes here to select Cadence I2C Host Controller. This controller is
e.g. used by Xilinx Zynq.
config SYS_I2C_INTEL
bool "Intel I2C/SMBUS driver"
depends on DM_I2C

1
drivers/i2c/Makefile
View File

@@ -16,6 +16,7 @@ obj-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o
obj-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
obj-$(CONFIG_SYS_I2C) += i2c_core.o
obj-$(CONFIG_SYS_I2C_CADENCE) += i2c-cdns.o
obj-$(CONFIG_SYS_I2C_DAVINCI) += davinci_i2c.o
obj-$(CONFIG_SYS_I2C_DW) += designware_i2c.o
obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o

335
drivers/i2c/i2c-cdns.c Normal file
View File

@@ -0,0 +1,335 @@
/*
* Copyright (C) 2015 Moritz Fischer <moritz.fischer@ettus.com>
* IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
*
* This file is based on: drivers/i2c/zynq_i2c.c,
* with added driver-model support and code cleanup.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/types.h>
#include <linux/io.h>
#include <asm/errno.h>
#include <dm/device.h>
#include <dm/root.h>
#include <i2c.h>
#include <fdtdec.h>
#include <mapmem.h>
DECLARE_GLOBAL_DATA_PTR;
/* i2c register set */
struct cdns_i2c_regs {
u32 control;
u32 status;
u32 address;
u32 data;
u32 interrupt_status;
u32 transfer_size;
u32 slave_mon_pause;
u32 time_out;
u32 interrupt_mask;
u32 interrupt_enable;
u32 interrupt_disable;
};
/* Control register fields */
#define CDNS_I2C_CONTROL_RW 0x00000001
#define CDNS_I2C_CONTROL_MS 0x00000002
#define CDNS_I2C_CONTROL_NEA 0x00000004
#define CDNS_I2C_CONTROL_ACKEN 0x00000008
#define CDNS_I2C_CONTROL_HOLD 0x00000010
#define CDNS_I2C_CONTROL_SLVMON 0x00000020
#define CDNS_I2C_CONTROL_CLR_FIFO 0x00000040
#define CDNS_I2C_CONTROL_DIV_B_SHIFT 8
#define CDNS_I2C_CONTROL_DIV_B_MASK 0x00003F00
#define CDNS_I2C_CONTROL_DIV_A_SHIFT 14
#define CDNS_I2C_CONTROL_DIV_A_MASK 0x0000C000
/* Status register values */
#define CDNS_I2C_STATUS_RXDV 0x00000020
#define CDNS_I2C_STATUS_TXDV 0x00000040
#define CDNS_I2C_STATUS_RXOVF 0x00000080
#define CDNS_I2C_STATUS_BA 0x00000100
/* Interrupt register fields */
#define CDNS_I2C_INTERRUPT_COMP 0x00000001
#define CDNS_I2C_INTERRUPT_DATA 0x00000002
#define CDNS_I2C_INTERRUPT_NACK 0x00000004
#define CDNS_I2C_INTERRUPT_TO 0x00000008
#define CDNS_I2C_INTERRUPT_SLVRDY 0x00000010
#define CDNS_I2C_INTERRUPT_RXOVF 0x00000020
#define CDNS_I2C_INTERRUPT_TXOVF 0x00000040
#define CDNS_I2C_INTERRUPT_RXUNF 0x00000080
#define CDNS_I2C_INTERRUPT_ARBLOST 0x00000200
#define CDNS_I2C_FIFO_DEPTH 16
#define CDNS_I2C_TRANSFER_SIZE_MAX 255 /* Controller transfer limit */
#ifdef DEBUG
static void cdns_i2c_debug_status(struct cdns_i2c_regs *cdns_i2c)
{
int int_status;
int status;
int_status = readl(&cdns_i2c->interrupt_status);
status = readl(&cdns_i2c->status);
if (int_status || status) {
debug("Status: ");
if (int_status & CDNS_I2C_INTERRUPT_COMP)
debug("COMP ");
if (int_status & CDNS_I2C_INTERRUPT_DATA)
debug("DATA ");
if (int_status & CDNS_I2C_INTERRUPT_NACK)
debug("NACK ");
if (int_status & CDNS_I2C_INTERRUPT_TO)
debug("TO ");
if (int_status & CDNS_I2C_INTERRUPT_SLVRDY)
debug("SLVRDY ");
if (int_status & CDNS_I2C_INTERRUPT_RXOVF)
debug("RXOVF ");
if (int_status & CDNS_I2C_INTERRUPT_TXOVF)
debug("TXOVF ");
if (int_status & CDNS_I2C_INTERRUPT_RXUNF)
debug("RXUNF ");
if (int_status & CDNS_I2C_INTERRUPT_ARBLOST)
debug("ARBLOST ");
if (status & CDNS_I2C_STATUS_RXDV)
debug("RXDV ");
if (status & CDNS_I2C_STATUS_TXDV)
debug("TXDV ");
if (status & CDNS_I2C_STATUS_RXOVF)
debug("RXOVF ");
if (status & CDNS_I2C_STATUS_BA)
debug("BA ");
debug("TS%d ", readl(&cdns_i2c->transfer_size));
debug("\n");
}
}
#endif
struct i2c_cdns_bus {
int id;
struct cdns_i2c_regs __iomem *regs; /* register base */
};
/** cdns_i2c_probe() - Probe method
* @dev: udevice pointer
*
* DM callback called when device is probed
*/
static int cdns_i2c_probe(struct udevice *dev)
{
struct i2c_cdns_bus *bus = dev_get_priv(dev);
bus->regs = (struct cdns_i2c_regs *)dev_get_addr(dev);
if (!bus->regs)
return -ENOMEM;
/* TODO: Calculate dividers based on CPU_CLK_1X */
/* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
writel((16 << CDNS_I2C_CONTROL_DIV_B_SHIFT) |
(2 << CDNS_I2C_CONTROL_DIV_A_SHIFT), &bus->regs->control);
/* Enable master mode, ack, and 7-bit addressing */
setbits_le32(&bus->regs->control, CDNS_I2C_CONTROL_MS |
CDNS_I2C_CONTROL_ACKEN | CDNS_I2C_CONTROL_NEA);
debug("%s bus %d at %p\n", __func__, dev->seq, bus->regs);
return 0;
}
static int cdns_i2c_remove(struct udevice *dev)
{
struct i2c_cdns_bus *bus = dev_get_priv(dev);
debug("%s bus %d at %p\n", __func__, dev->seq, bus->regs);
unmap_sysmem(bus->regs);
return 0;
}
/* Wait for an interrupt */
static u32 cdns_i2c_wait(struct cdns_i2c_regs *cdns_i2c, u32 mask)
{
int timeout, int_status;
for (timeout = 0; timeout < 100; timeout++) {
udelay(100);
int_status = readl(&cdns_i2c->interrupt_status);
if (int_status & mask)
break;
}
/* Clear interrupt status flags */
writel(int_status & mask, &cdns_i2c->interrupt_status);
return int_status & mask;
}
static int cdns_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
{
if (speed != 100000) {
printf("%s, failed to set clock speed to %u\n", __func__,
speed);
return -EINVAL;
}
return 0;
}
/* Probe to see if a chip is present. */
static int cdns_i2c_probe_chip(struct udevice *bus, uint chip_addr,
uint chip_flags)
{
struct i2c_cdns_bus *i2c_bus = dev_get_priv(bus);
struct cdns_i2c_regs *regs = i2c_bus->regs;
/* Attempt to read a byte */
setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO |
CDNS_I2C_CONTROL_RW);
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);
writel(0xFF, &regs->interrupt_status);
writel(chip_addr, &regs->address);
writel(1, &regs->transfer_size);
return (cdns_i2c_wait(regs, CDNS_I2C_INTERRUPT_COMP |
CDNS_I2C_INTERRUPT_NACK) &
CDNS_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
}
static int cdns_i2c_write_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
u32 len, bool next_is_read)
{
u8 *cur_data = data;
struct cdns_i2c_regs *regs = i2c_bus->regs;
setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO |
CDNS_I2C_CONTROL_HOLD);
/* if next is a read, we need to clear HOLD, doesn't work */
if (next_is_read)
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_RW);
writel(0xFF, &regs->interrupt_status);
writel(addr, &regs->address);
while (len--) {
writel(*(cur_data++), &regs->data);
if (readl(&regs->transfer_size) == CDNS_I2C_FIFO_DEPTH) {
if (!cdns_i2c_wait(regs, CDNS_I2C_INTERRUPT_COMP)) {
/* Release the bus */
clrbits_le32(&regs->control,
CDNS_I2C_CONTROL_HOLD);
return -ETIMEDOUT;
}
}
}
/* All done... release the bus */
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);
/* Wait for the address and data to be sent */
if (!cdns_i2c_wait(regs, CDNS_I2C_INTERRUPT_COMP))
return -ETIMEDOUT;
return 0;
}
static int cdns_i2c_read_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
u32 len)
{
u32 status;
u32 i = 0;
u8 *cur_data = data;
/* TODO: Fix this */
struct cdns_i2c_regs *regs = i2c_bus->regs;
/* Check the hardware can handle the requested bytes */
if ((len < 0) || (len > CDNS_I2C_TRANSFER_SIZE_MAX))
return -EINVAL;
setbits_le32(&regs->control, CDNS_I2C_CONTROL_CLR_FIFO |
CDNS_I2C_CONTROL_RW);
/* Start reading data */
writel(addr, &regs->address);
writel(len, &regs->transfer_size);
/* Wait for data */
do {
status = cdns_i2c_wait(regs, CDNS_I2C_INTERRUPT_COMP |
CDNS_I2C_INTERRUPT_DATA);
if (!status) {
/* Release the bus */
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);
return -ETIMEDOUT;
}
debug("Read %d bytes\n",
len - readl(&regs->transfer_size));
for (; i < len - readl(&regs->transfer_size); i++)
*(cur_data++) = readl(&regs->data);
} while (readl(&regs->transfer_size) != 0);
/* All done... release the bus */
clrbits_le32(&regs->control, CDNS_I2C_CONTROL_HOLD);
#ifdef DEBUG
cdns_i2c_debug_status(regs);
#endif
return 0;
}
static int cdns_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
int nmsgs)
{
struct i2c_cdns_bus *i2c_bus = dev_get_priv(dev);
int ret;
debug("i2c_xfer: %d messages\n", nmsgs);
for (; nmsgs > 0; nmsgs--, msg++) {
bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
if (msg->flags & I2C_M_RD) {
ret = cdns_i2c_read_data(i2c_bus, msg->addr, msg->buf,
msg->len);
} else {
ret = cdns_i2c_write_data(i2c_bus, msg->addr, msg->buf,
msg->len, next_is_read);
}
if (ret) {
debug("i2c_write: error sending\n");
return -EREMOTEIO;
}
}
return 0;
}
static const struct dm_i2c_ops cdns_i2c_ops = {
.xfer = cdns_i2c_xfer,
.probe_chip = cdns_i2c_probe_chip,
.set_bus_speed = cdns_i2c_set_bus_speed,
};
static const struct udevice_id cdns_i2c_of_match[] = {
{ .compatible = "cdns,i2c-r1p10" },
{ /* end of table */ }
};
U_BOOT_DRIVER(cdns_i2c) = {
.name = "i2c-cdns",
.id = UCLASS_I2C,
.of_match = cdns_i2c_of_match,
.probe = cdns_i2c_probe,
.remove = cdns_i2c_remove,
.priv_auto_alloc_size = sizeof(struct i2c_cdns_bus),
.ops = &cdns_i2c_ops,
};