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8934f78465
Support Xilinx Zynq i2c controller. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Heiko Schocher <hs@denx.de> Reviewed-by: Tom Rini <trini@ti.com>
306 lines
8.5 KiB
C
306 lines
8.5 KiB
C
/*
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* Driver for the Zynq-7000 PS I2C controller
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* IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
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*
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* Author: Joe Hershberger <joe.hershberger@ni.com>
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* Copyright (c) 2012 Joe Hershberger.
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*
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* Copyright (c) 2012-2013 Xilinx, Michal Simek
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include <asm/errno.h>
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#include <asm/arch/hardware.h>
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/* i2c register set */
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struct zynq_i2c_registers {
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u32 control;
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u32 status;
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u32 address;
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u32 data;
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u32 interrupt_status;
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u32 transfer_size;
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u32 slave_mon_pause;
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u32 time_out;
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u32 interrupt_mask;
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u32 interrupt_enable;
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u32 interrupt_disable;
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};
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/* Control register fields */
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#define ZYNQ_I2C_CONTROL_RW 0x00000001
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#define ZYNQ_I2C_CONTROL_MS 0x00000002
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#define ZYNQ_I2C_CONTROL_NEA 0x00000004
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#define ZYNQ_I2C_CONTROL_ACKEN 0x00000008
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#define ZYNQ_I2C_CONTROL_HOLD 0x00000010
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#define ZYNQ_I2C_CONTROL_SLVMON 0x00000020
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#define ZYNQ_I2C_CONTROL_CLR_FIFO 0x00000040
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#define ZYNQ_I2C_CONTROL_DIV_B_SHIFT 8
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#define ZYNQ_I2C_CONTROL_DIV_B_MASK 0x00003F00
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#define ZYNQ_I2C_CONTROL_DIV_A_SHIFT 14
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#define ZYNQ_I2C_CONTROL_DIV_A_MASK 0x0000C000
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/* Status register values */
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#define ZYNQ_I2C_STATUS_RXDV 0x00000020
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#define ZYNQ_I2C_STATUS_TXDV 0x00000040
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#define ZYNQ_I2C_STATUS_RXOVF 0x00000080
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#define ZYNQ_I2C_STATUS_BA 0x00000100
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/* Interrupt register fields */
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#define ZYNQ_I2C_INTERRUPT_COMP 0x00000001
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#define ZYNQ_I2C_INTERRUPT_DATA 0x00000002
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#define ZYNQ_I2C_INTERRUPT_NACK 0x00000004
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#define ZYNQ_I2C_INTERRUPT_TO 0x00000008
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#define ZYNQ_I2C_INTERRUPT_SLVRDY 0x00000010
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#define ZYNQ_I2C_INTERRUPT_RXOVF 0x00000020
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#define ZYNQ_I2C_INTERRUPT_TXOVF 0x00000040
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#define ZYNQ_I2C_INTERRUPT_RXUNF 0x00000080
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#define ZYNQ_I2C_INTERRUPT_ARBLOST 0x00000200
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#define ZYNQ_I2C_FIFO_DEPTH 16
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#define ZYNQ_I2C_TRANSFERT_SIZE_MAX 255 /* Controller transfer limit */
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#if defined(CONFIG_ZYNQ_I2C0)
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# define ZYNQ_I2C_BASE ZYNQ_I2C_BASEADDR0
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#else
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# define ZYNQ_I2C_BASE ZYNQ_I2C_BASEADDR1
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#endif
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static struct zynq_i2c_registers *zynq_i2c =
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(struct zynq_i2c_registers *)ZYNQ_I2C_BASE;
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/* I2C init called by cmd_i2c when doing 'i2c reset'. */
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void i2c_init(int requested_speed, int slaveadd)
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{
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/* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
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writel((16 << ZYNQ_I2C_CONTROL_DIV_B_SHIFT) |
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(2 << ZYNQ_I2C_CONTROL_DIV_A_SHIFT), &zynq_i2c->control);
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/* Enable master mode, ack, and 7-bit addressing */
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setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_MS |
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ZYNQ_I2C_CONTROL_ACKEN | ZYNQ_I2C_CONTROL_NEA);
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}
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#ifdef DEBUG
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static void zynq_i2c_debug_status(void)
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{
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int int_status;
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int status;
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int_status = readl(&zynq_i2c->interrupt_status);
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status = readl(&zynq_i2c->status);
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if (int_status || status) {
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debug("Status: ");
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if (int_status & ZYNQ_I2C_INTERRUPT_COMP)
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debug("COMP ");
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if (int_status & ZYNQ_I2C_INTERRUPT_DATA)
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debug("DATA ");
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if (int_status & ZYNQ_I2C_INTERRUPT_NACK)
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debug("NACK ");
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if (int_status & ZYNQ_I2C_INTERRUPT_TO)
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debug("TO ");
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if (int_status & ZYNQ_I2C_INTERRUPT_SLVRDY)
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debug("SLVRDY ");
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if (int_status & ZYNQ_I2C_INTERRUPT_RXOVF)
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debug("RXOVF ");
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if (int_status & ZYNQ_I2C_INTERRUPT_TXOVF)
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debug("TXOVF ");
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if (int_status & ZYNQ_I2C_INTERRUPT_RXUNF)
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debug("RXUNF ");
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if (int_status & ZYNQ_I2C_INTERRUPT_ARBLOST)
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debug("ARBLOST ");
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if (status & ZYNQ_I2C_STATUS_RXDV)
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debug("RXDV ");
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if (status & ZYNQ_I2C_STATUS_TXDV)
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debug("TXDV ");
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if (status & ZYNQ_I2C_STATUS_RXOVF)
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debug("RXOVF ");
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if (status & ZYNQ_I2C_STATUS_BA)
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debug("BA ");
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debug("TS%d ", readl(&zynq_i2c->transfer_size));
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debug("\n");
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}
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}
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#endif
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/* Wait for an interrupt */
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static u32 zynq_i2c_wait(u32 mask)
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{
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int timeout, int_status;
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for (timeout = 0; timeout < 100; timeout++) {
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udelay(100);
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int_status = readl(&zynq_i2c->interrupt_status);
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if (int_status & mask)
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break;
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}
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#ifdef DEBUG
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zynq_i2c_debug_status();
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#endif
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/* Clear interrupt status flags */
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writel(int_status & mask, &zynq_i2c->interrupt_status);
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return int_status & mask;
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}
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/*
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* I2C probe called by cmd_i2c when doing 'i2c probe'.
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* Begin read, nak data byte, end.
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*/
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int i2c_probe(u8 dev)
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{
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/* Attempt to read a byte */
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setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
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ZYNQ_I2C_CONTROL_RW);
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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writel(0xFF, &zynq_i2c->interrupt_status);
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writel(dev, &zynq_i2c->address);
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writel(1, &zynq_i2c->transfer_size);
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return (zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
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ZYNQ_I2C_INTERRUPT_NACK) &
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ZYNQ_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
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}
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/*
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* I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
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* Begin write, send address byte(s), begin read, receive data bytes, end.
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*/
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int i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
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{
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u32 status;
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u32 i = 0;
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u8 *cur_data = data;
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/* Check the hardware can handle the requested bytes */
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if ((length < 0) || (length > ZYNQ_I2C_TRANSFERT_SIZE_MAX))
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return -EINVAL;
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/* Write the register address */
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setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
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ZYNQ_I2C_CONTROL_HOLD);
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/*
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* Temporarily disable restart (by clearing hold)
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* It doesn't seem to work.
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*/
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW |
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ZYNQ_I2C_CONTROL_HOLD);
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writel(0xFF, &zynq_i2c->interrupt_status);
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while (alen--)
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writel(addr >> (8*alen), &zynq_i2c->data);
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writel(dev, &zynq_i2c->address);
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/* Wait for the address to be sent */
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if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
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/* Release the bus */
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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return -ETIMEDOUT;
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}
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debug("Device acked address\n");
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setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
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ZYNQ_I2C_CONTROL_RW);
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/* Start reading data */
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writel(dev, &zynq_i2c->address);
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writel(length, &zynq_i2c->transfer_size);
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/* Wait for data */
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do {
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status = zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
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ZYNQ_I2C_INTERRUPT_DATA);
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if (!status) {
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/* Release the bus */
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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return -ETIMEDOUT;
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}
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debug("Read %d bytes\n",
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length - readl(&zynq_i2c->transfer_size));
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for (; i < length - readl(&zynq_i2c->transfer_size); i++)
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*(cur_data++) = readl(&zynq_i2c->data);
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} while (readl(&zynq_i2c->transfer_size) != 0);
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/* All done... release the bus */
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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#ifdef DEBUG
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zynq_i2c_debug_status();
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#endif
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return 0;
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}
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/*
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* I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
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* Begin write, send address byte(s), send data bytes, end.
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*/
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int i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
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{
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u8 *cur_data = data;
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/* Write the register address */
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setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
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ZYNQ_I2C_CONTROL_HOLD);
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
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writel(0xFF, &zynq_i2c->interrupt_status);
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while (alen--)
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writel(addr >> (8*alen), &zynq_i2c->data);
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/* Start the tranfer */
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writel(dev, &zynq_i2c->address);
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if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
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/* Release the bus */
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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return -ETIMEDOUT;
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}
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debug("Device acked address\n");
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while (length--) {
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writel(*(cur_data++), &zynq_i2c->data);
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if (readl(&zynq_i2c->transfer_size) == ZYNQ_I2C_FIFO_DEPTH) {
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if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
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/* Release the bus */
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clrbits_le32(&zynq_i2c->control,
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ZYNQ_I2C_CONTROL_HOLD);
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return -ETIMEDOUT;
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}
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}
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}
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/* All done... release the bus */
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clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
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/* Wait for the address and data to be sent */
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if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP))
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return -ETIMEDOUT;
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return 0;
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}
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int i2c_set_bus_num(unsigned int bus)
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{
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/* Only support bus 0 */
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if (bus > 0)
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return -1;
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return 0;
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}
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unsigned int i2c_get_bus_num(void)
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{
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/* Only support bus 0 */
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return 0;
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}
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