+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Driver for the Zynq-7000 PS I2C controller
- * IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
- *
- * Author: Joe Hershberger <joe.hershberger@ni.com>
- * Copyright (c) 2012 Joe Hershberger.
- *
- * Copyright (c) 2012-2013 Xilinx, Michal Simek
- *
- * NOTE: This driver should be converted to driver model before June 2017.
- * Please see doc/driver-model/i2c-howto.txt for instructions.
- */
-
-#include <common.h>
-#include <asm/io.h>
-#include <i2c.h>
-#include <linux/errno.h>
-#include <asm/arch/hardware.h>
-
-/* i2c register set */
-struct zynq_i2c_registers {
- 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 ZYNQ_I2C_CONTROL_RW 0x00000001
-#define ZYNQ_I2C_CONTROL_MS 0x00000002
-#define ZYNQ_I2C_CONTROL_NEA 0x00000004
-#define ZYNQ_I2C_CONTROL_ACKEN 0x00000008
-#define ZYNQ_I2C_CONTROL_HOLD 0x00000010
-#define ZYNQ_I2C_CONTROL_SLVMON 0x00000020
-#define ZYNQ_I2C_CONTROL_CLR_FIFO 0x00000040
-#define ZYNQ_I2C_CONTROL_DIV_B_SHIFT 8
-#define ZYNQ_I2C_CONTROL_DIV_B_MASK 0x00003F00
-#define ZYNQ_I2C_CONTROL_DIV_A_SHIFT 14
-#define ZYNQ_I2C_CONTROL_DIV_A_MASK 0x0000C000
-
-/* Status register values */
-#define ZYNQ_I2C_STATUS_RXDV 0x00000020
-#define ZYNQ_I2C_STATUS_TXDV 0x00000040
-#define ZYNQ_I2C_STATUS_RXOVF 0x00000080
-#define ZYNQ_I2C_STATUS_BA 0x00000100
-
-/* Interrupt register fields */
-#define ZYNQ_I2C_INTERRUPT_COMP 0x00000001
-#define ZYNQ_I2C_INTERRUPT_DATA 0x00000002
-#define ZYNQ_I2C_INTERRUPT_NACK 0x00000004
-#define ZYNQ_I2C_INTERRUPT_TO 0x00000008
-#define ZYNQ_I2C_INTERRUPT_SLVRDY 0x00000010
-#define ZYNQ_I2C_INTERRUPT_RXOVF 0x00000020
-#define ZYNQ_I2C_INTERRUPT_TXOVF 0x00000040
-#define ZYNQ_I2C_INTERRUPT_RXUNF 0x00000080
-#define ZYNQ_I2C_INTERRUPT_ARBLOST 0x00000200
-
-#define ZYNQ_I2C_FIFO_DEPTH 16
-#define ZYNQ_I2C_TRANSFERT_SIZE_MAX 255 /* Controller transfer limit */
-
-static struct zynq_i2c_registers *i2c_select(struct i2c_adapter *adap)
-{
- return adap->hwadapnr ?
- /* Zynq PS I2C1 */
- (struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR1 :
- /* Zynq PS I2C0 */
- (struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR0;
-}
-
-/* I2C init called by cmd_i2c when doing 'i2c reset'. */
-static void zynq_i2c_init(struct i2c_adapter *adap, int requested_speed,
- int slaveadd)
-{
- struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
-
- /* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
- writel((16 << ZYNQ_I2C_CONTROL_DIV_B_SHIFT) |
- (2 << ZYNQ_I2C_CONTROL_DIV_A_SHIFT), &zynq_i2c->control);
-
- /* Enable master mode, ack, and 7-bit addressing */
- setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_MS |
- ZYNQ_I2C_CONTROL_ACKEN | ZYNQ_I2C_CONTROL_NEA);
-}
-
-#ifdef DEBUG
-static void zynq_i2c_debug_status(struct zynq_i2c_registers *zynq_i2c)
-{
- int int_status;
- int status;
- int_status = readl(&zynq_i2c->interrupt_status);
-
- status = readl(&zynq_i2c->status);
- if (int_status || status) {
- debug("Status: ");
- if (int_status & ZYNQ_I2C_INTERRUPT_COMP)
- debug("COMP ");
- if (int_status & ZYNQ_I2C_INTERRUPT_DATA)
- debug("DATA ");
- if (int_status & ZYNQ_I2C_INTERRUPT_NACK)
- debug("NACK ");
- if (int_status & ZYNQ_I2C_INTERRUPT_TO)
- debug("TO ");
- if (int_status & ZYNQ_I2C_INTERRUPT_SLVRDY)
- debug("SLVRDY ");
- if (int_status & ZYNQ_I2C_INTERRUPT_RXOVF)
- debug("RXOVF ");
- if (int_status & ZYNQ_I2C_INTERRUPT_TXOVF)
- debug("TXOVF ");
- if (int_status & ZYNQ_I2C_INTERRUPT_RXUNF)
- debug("RXUNF ");
- if (int_status & ZYNQ_I2C_INTERRUPT_ARBLOST)
- debug("ARBLOST ");
- if (status & ZYNQ_I2C_STATUS_RXDV)
- debug("RXDV ");
- if (status & ZYNQ_I2C_STATUS_TXDV)
- debug("TXDV ");
- if (status & ZYNQ_I2C_STATUS_RXOVF)
- debug("RXOVF ");
- if (status & ZYNQ_I2C_STATUS_BA)
- debug("BA ");
- debug("TS%d ", readl(&zynq_i2c->transfer_size));
- debug("\n");
- }
-}
-#endif
-
-/* Wait for an interrupt */
-static u32 zynq_i2c_wait(struct zynq_i2c_registers *zynq_i2c, u32 mask)
-{
- int timeout, int_status;
-
- for (timeout = 0; timeout < 100; timeout++) {
- udelay(100);
- int_status = readl(&zynq_i2c->interrupt_status);
- if (int_status & mask)
- break;
- }
-#ifdef DEBUG
- zynq_i2c_debug_status(zynq_i2c);
-#endif
- /* Clear interrupt status flags */
- writel(int_status & mask, &zynq_i2c->interrupt_status);
-
- return int_status & mask;
-}
-
-/*
- * I2C probe called by cmd_i2c when doing 'i2c probe'.
- * Begin read, nak data byte, end.
- */
-static int zynq_i2c_probe(struct i2c_adapter *adap, u8 dev)
-{
- struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
-
- /* Attempt to read a byte */
- setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
- ZYNQ_I2C_CONTROL_RW);
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- writel(0xFF, &zynq_i2c->interrupt_status);
- writel(dev, &zynq_i2c->address);
- writel(1, &zynq_i2c->transfer_size);
-
- return (zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
- ZYNQ_I2C_INTERRUPT_NACK) &
- ZYNQ_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
-}
-
-/*
- * I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
- * Begin write, send address byte(s), begin read, receive data bytes, end.
- */
-static int zynq_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *data, int length)
-{
- u32 status;
- u32 i = 0;
- u8 *cur_data = data;
- struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
-
- /* Check the hardware can handle the requested bytes */
- if ((length < 0) || (length > ZYNQ_I2C_TRANSFERT_SIZE_MAX))
- return -EINVAL;
-
- /* Write the register address */
- setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
- ZYNQ_I2C_CONTROL_HOLD);
- /*
- * Temporarily disable restart (by clearing hold)
- * It doesn't seem to work.
- */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- writel(0xFF, &zynq_i2c->interrupt_status);
- if (alen) {
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
- writel(dev, &zynq_i2c->address);
- while (alen--)
- writel(addr >> (8 * alen), &zynq_i2c->data);
-
- /* Wait for the address to be sent */
- if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
- /* Release the bus */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- return -ETIMEDOUT;
- }
- debug("Device acked address\n");
- }
-
- setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
- ZYNQ_I2C_CONTROL_RW);
- /* Start reading data */
- writel(dev, &zynq_i2c->address);
- writel(length, &zynq_i2c->transfer_size);
-
- /* Wait for data */
- do {
- status = zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
- ZYNQ_I2C_INTERRUPT_DATA);
- if (!status) {
- /* Release the bus */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- return -ETIMEDOUT;
- }
- debug("Read %d bytes\n",
- length - readl(&zynq_i2c->transfer_size));
- for (; i < length - readl(&zynq_i2c->transfer_size); i++)
- *(cur_data++) = readl(&zynq_i2c->data);
- } while (readl(&zynq_i2c->transfer_size) != 0);
- /* All done... release the bus */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
-
-#ifdef DEBUG
- zynq_i2c_debug_status(zynq_i2c);
-#endif
- return 0;
-}
-
-/*
- * I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
- * Begin write, send address byte(s), send data bytes, end.
- */
-static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *data, int length)
-{
- u8 *cur_data = data;
- struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
-
- /* Write the register address */
- setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
- ZYNQ_I2C_CONTROL_HOLD);
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
- writel(0xFF, &zynq_i2c->interrupt_status);
- writel(dev, &zynq_i2c->address);
- if (alen) {
- while (alen--)
- writel(addr >> (8 * alen), &zynq_i2c->data);
- /* Start the tranfer */
- if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
- /* Release the bus */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- return -ETIMEDOUT;
- }
- debug("Device acked address\n");
- }
-
- while (length--) {
- writel(*(cur_data++), &zynq_i2c->data);
- if (readl(&zynq_i2c->transfer_size) == ZYNQ_I2C_FIFO_DEPTH) {
- if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
- /* Release the bus */
- clrbits_le32(&zynq_i2c->control,
- ZYNQ_I2C_CONTROL_HOLD);
- return -ETIMEDOUT;
- }
- }
- }
-
- /* All done... release the bus */
- clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
- /* Wait for the address and data to be sent */
- if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP))
- return -ETIMEDOUT;
- return 0;
-}
-
-static unsigned int zynq_i2c_set_bus_speed(struct i2c_adapter *adap,
- unsigned int speed)
-{
- if (speed != 1000000)
- return -EINVAL;
-
- return 0;
-}
-
-#ifdef CONFIG_ZYNQ_I2C0
-U_BOOT_I2C_ADAP_COMPLETE(zynq_0, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
- zynq_i2c_write, zynq_i2c_set_bus_speed,
- CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
- 0)
-#endif
-#ifdef CONFIG_ZYNQ_I2C1
-U_BOOT_I2C_ADAP_COMPLETE(zynq_1, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
- zynq_i2c_write, zynq_i2c_set_bus_speed,
- CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
- 1)
-#endif
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