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![Peng Fan](/assets/img/avatar_default.png)
When CONFIG_CLK enabled, use CLK UCLASS for clk related settings. Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de> Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de> hs: removed hunk in mxc_i2c_probe() as not longer in code
1054 lines
27 KiB
C
1054 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* i2c driver for Freescale i.MX series
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*
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* (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
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* (c) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* Based on i2c-imx.c from linux kernel:
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* Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de>
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* Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de>
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* Copyright (C) 2007 RightHand Technologies, Inc.
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* Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
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*
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*/
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#include <common.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/imx-regs.h>
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#include <linux/errno.h>
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#include <asm/mach-imx/mxc_i2c.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include <watchdog.h>
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#include <dm.h>
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#include <dm/pinctrl.h>
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#include <fdtdec.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define I2C_QUIRK_FLAG (1 << 0)
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#define IMX_I2C_REGSHIFT 2
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#define VF610_I2C_REGSHIFT 0
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#define I2C_EARLY_INIT_INDEX 0
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#ifdef CONFIG_SYS_I2C_IFDR_DIV
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#define I2C_IFDR_DIV_CONSERVATIVE CONFIG_SYS_I2C_IFDR_DIV
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#else
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#define I2C_IFDR_DIV_CONSERVATIVE 0x7e
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#endif
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/* Register index */
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#define IADR 0
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#define IFDR 1
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#define I2CR 2
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#define I2SR 3
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#define I2DR 4
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#define I2CR_IIEN (1 << 6)
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#define I2CR_MSTA (1 << 5)
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#define I2CR_MTX (1 << 4)
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#define I2CR_TX_NO_AK (1 << 3)
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#define I2CR_RSTA (1 << 2)
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#define I2SR_ICF (1 << 7)
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#define I2SR_IBB (1 << 5)
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#define I2SR_IAL (1 << 4)
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#define I2SR_IIF (1 << 1)
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#define I2SR_RX_NO_AK (1 << 0)
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#ifdef I2C_QUIRK_REG
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#define I2CR_IEN (0 << 7)
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#define I2CR_IDIS (1 << 7)
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#define I2SR_IIF_CLEAR (1 << 1)
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#else
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#define I2CR_IEN (1 << 7)
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#define I2CR_IDIS (0 << 7)
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#define I2SR_IIF_CLEAR (0 << 1)
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#endif
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#ifdef I2C_QUIRK_REG
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static u16 i2c_clk_div[60][2] = {
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{ 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 },
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{ 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 },
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{ 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D },
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{ 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 },
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{ 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 },
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{ 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 },
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{ 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 },
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{ 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 },
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{ 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 },
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{ 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B },
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{ 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 },
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{ 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 },
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{ 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B },
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{ 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A },
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{ 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E },
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};
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#else
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static u16 i2c_clk_div[50][2] = {
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{ 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
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{ 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
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{ 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
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{ 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
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{ 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
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{ 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
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{ 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
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{ 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
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{ 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
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{ 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
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{ 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
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{ 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
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{ 3072, 0x1E }, { 3840, 0x1F }
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};
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#endif
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#ifndef CONFIG_SYS_MXC_I2C1_SPEED
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#define CONFIG_SYS_MXC_I2C1_SPEED 100000
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#endif
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#ifndef CONFIG_SYS_MXC_I2C2_SPEED
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#define CONFIG_SYS_MXC_I2C2_SPEED 100000
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#endif
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#ifndef CONFIG_SYS_MXC_I2C3_SPEED
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#define CONFIG_SYS_MXC_I2C3_SPEED 100000
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#endif
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#ifndef CONFIG_SYS_MXC_I2C4_SPEED
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#define CONFIG_SYS_MXC_I2C4_SPEED 100000
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#endif
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#ifndef CONFIG_SYS_MXC_I2C1_SLAVE
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#define CONFIG_SYS_MXC_I2C1_SLAVE 0
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#endif
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#ifndef CONFIG_SYS_MXC_I2C2_SLAVE
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#define CONFIG_SYS_MXC_I2C2_SLAVE 0
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#endif
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#ifndef CONFIG_SYS_MXC_I2C3_SLAVE
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#define CONFIG_SYS_MXC_I2C3_SLAVE 0
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#endif
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#ifndef CONFIG_SYS_MXC_I2C4_SLAVE
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#define CONFIG_SYS_MXC_I2C4_SLAVE 0
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#endif
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/*
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* Calculate and set proper clock divider
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*/
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static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate)
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{
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unsigned int i2c_clk_rate;
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unsigned int div;
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u8 clk_div;
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#if defined(CONFIG_MX31)
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struct clock_control_regs *sc_regs =
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(struct clock_control_regs *)CCM_BASE;
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/* start the required I2C clock */
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writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET),
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&sc_regs->cgr0);
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#endif
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/* Divider value calculation */
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#if CONFIG_IS_ENABLED(CLK)
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i2c_clk_rate = clk_get_rate(&i2c_bus->per_clk);
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#else
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i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK);
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#endif
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div = (i2c_clk_rate + rate - 1) / rate;
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if (div < i2c_clk_div[0][0])
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clk_div = 0;
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else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
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clk_div = ARRAY_SIZE(i2c_clk_div) - 1;
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else
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for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++)
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;
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/* Store divider value */
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return clk_div;
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}
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/*
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* Set I2C Bus speed
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*/
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static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed)
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{
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ulong base = i2c_bus->base;
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bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
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u8 clk_idx = i2c_imx_get_clk(i2c_bus, speed);
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u8 idx = i2c_clk_div[clk_idx][1];
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int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
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if (!base)
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return -EINVAL;
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/* Store divider value */
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writeb(idx, base + (IFDR << reg_shift));
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/* Reset module */
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writeb(I2CR_IDIS, base + (I2CR << reg_shift));
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writeb(0, base + (I2SR << reg_shift));
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return 0;
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}
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#define ST_BUS_IDLE (0 | (I2SR_IBB << 8))
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#define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8))
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#define ST_IIF (I2SR_IIF | (I2SR_IIF << 8))
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static int wait_for_sr_state(struct mxc_i2c_bus *i2c_bus, unsigned state)
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{
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unsigned sr;
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ulong elapsed;
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bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
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int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
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ulong base = i2c_bus->base;
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ulong start_time = get_timer(0);
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for (;;) {
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sr = readb(base + (I2SR << reg_shift));
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if (sr & I2SR_IAL) {
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if (quirk)
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writeb(sr | I2SR_IAL, base +
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(I2SR << reg_shift));
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else
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writeb(sr & ~I2SR_IAL, base +
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(I2SR << reg_shift));
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printf("%s: Arbitration lost sr=%x cr=%x state=%x\n",
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__func__, sr, readb(base + (I2CR << reg_shift)),
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state);
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return -ERESTART;
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}
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if ((sr & (state >> 8)) == (unsigned char)state)
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return sr;
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WATCHDOG_RESET();
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elapsed = get_timer(start_time);
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if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */
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break;
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}
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printf("%s: failed sr=%x cr=%x state=%x\n", __func__,
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sr, readb(base + (I2CR << reg_shift)), state);
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return -ETIMEDOUT;
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}
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static int tx_byte(struct mxc_i2c_bus *i2c_bus, u8 byte)
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{
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int ret;
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int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
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VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
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ulong base = i2c_bus->base;
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writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
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writeb(byte, base + (I2DR << reg_shift));
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ret = wait_for_sr_state(i2c_bus, ST_IIF);
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if (ret < 0)
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return ret;
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if (ret & I2SR_RX_NO_AK)
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return -EREMOTEIO;
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return 0;
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}
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/*
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* Stub implementations for outer i2c slave operations.
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*/
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void __i2c_force_reset_slave(void)
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{
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}
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void i2c_force_reset_slave(void)
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__attribute__((weak, alias("__i2c_force_reset_slave")));
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/*
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* Stop I2C transaction
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*/
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static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus)
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{
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int ret;
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int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
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VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
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ulong base = i2c_bus->base;
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unsigned int temp = readb(base + (I2CR << reg_shift));
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temp &= ~(I2CR_MSTA | I2CR_MTX);
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writeb(temp, base + (I2CR << reg_shift));
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ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
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if (ret < 0)
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printf("%s:trigger stop failed\n", __func__);
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}
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/*
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* Send start signal, chip address and
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* write register address
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*/
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static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip,
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u32 addr, int alen)
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{
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unsigned int temp;
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int ret;
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bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
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ulong base = i2c_bus->base;
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int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
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/* Reset i2c slave */
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i2c_force_reset_slave();
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/* Enable I2C controller */
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if (quirk)
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ret = readb(base + (I2CR << reg_shift)) & I2CR_IDIS;
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else
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ret = !(readb(base + (I2CR << reg_shift)) & I2CR_IEN);
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if (ret) {
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writeb(I2CR_IEN, base + (I2CR << reg_shift));
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/* Wait for controller to be stable */
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udelay(50);
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}
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if (readb(base + (IADR << reg_shift)) == (chip << 1))
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writeb((chip << 1) ^ 2, base + (IADR << reg_shift));
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writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
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ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
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if (ret < 0)
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return ret;
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/* Start I2C transaction */
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temp = readb(base + (I2CR << reg_shift));
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temp |= I2CR_MSTA;
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writeb(temp, base + (I2CR << reg_shift));
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ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY);
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if (ret < 0)
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return ret;
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temp |= I2CR_MTX | I2CR_TX_NO_AK;
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writeb(temp, base + (I2CR << reg_shift));
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if (alen >= 0) {
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/* write slave address */
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ret = tx_byte(i2c_bus, chip << 1);
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if (ret < 0)
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return ret;
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while (alen--) {
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ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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#ifndef CONFIG_DM_I2C
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int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
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{
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if (i2c_bus && i2c_bus->idle_bus_fn)
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return i2c_bus->idle_bus_fn(i2c_bus->idle_bus_data);
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return 0;
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}
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#else
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/*
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* See Linux Documentation/devicetree/bindings/i2c/i2c-imx.txt
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* "
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* scl-gpios: specify the gpio related to SCL pin
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* sda-gpios: specify the gpio related to SDA pin
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* add pinctrl to configure i2c pins to gpio function for i2c
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* bus recovery, call it "gpio" state
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* "
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*
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* The i2c_idle_bus is an implementation following Linux Kernel.
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*/
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int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
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{
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struct udevice *bus = i2c_bus->bus;
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struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
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struct gpio_desc *scl_gpio = &i2c_bus->scl_gpio;
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struct gpio_desc *sda_gpio = &i2c_bus->sda_gpio;
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int sda, scl, idle_sclks;
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int i, ret = 0;
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ulong elapsed, start_time;
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if (pinctrl_select_state(bus, "gpio")) {
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dev_dbg(bus, "Can not to switch to use gpio pinmux\n");
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/*
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* GPIO pinctrl for i2c force idle is not a must,
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* but it is strongly recommended to be used.
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* Because it can help you to recover from bad
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* i2c bus state. Do not return failure, because
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* it is not a must.
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*/
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return 0;
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}
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dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
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dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
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scl = dm_gpio_get_value(scl_gpio);
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sda = dm_gpio_get_value(sda_gpio);
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if ((sda & scl) == 1)
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goto exit; /* Bus is idle already */
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/*
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* In most cases it is just enough to generate 8 + 1 SCLK
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* clocks to recover I2C slave device from 'stuck' state
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* (when for example SW reset was performed, in the middle of
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* I2C transmission).
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*
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* However, there are devices which send data in packets of
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* N bytes (N > 1). In such case we do need N * 8 + 1 SCLK
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* clocks.
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*/
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idle_sclks = 8 + 1;
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if (i2c->max_transaction_bytes > 0)
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idle_sclks = i2c->max_transaction_bytes * 8 + 1;
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/* Send high and low on the SCL line */
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for (i = 0; i < idle_sclks; i++) {
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dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_OUT);
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dm_gpio_set_value(scl_gpio, 0);
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udelay(50);
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dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
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udelay(50);
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}
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start_time = get_timer(0);
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for (;;) {
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dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
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dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
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scl = dm_gpio_get_value(scl_gpio);
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sda = dm_gpio_get_value(sda_gpio);
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if ((sda & scl) == 1)
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break;
|
|
WATCHDOG_RESET();
|
|
elapsed = get_timer(start_time);
|
|
if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */
|
|
ret = -EBUSY;
|
|
printf("%s: failed to clear bus, sda=%d scl=%d\n", __func__, sda, scl);
|
|
break;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
pinctrl_select_state(bus, "default");
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static int i2c_init_transfer(struct mxc_i2c_bus *i2c_bus, u8 chip,
|
|
u32 addr, int alen)
|
|
{
|
|
int retry;
|
|
int ret;
|
|
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
|
|
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
|
|
|
|
if (!i2c_bus->base)
|
|
return -EINVAL;
|
|
|
|
for (retry = 0; retry < 3; retry++) {
|
|
ret = i2c_init_transfer_(i2c_bus, chip, addr, alen);
|
|
if (ret >= 0)
|
|
return 0;
|
|
i2c_imx_stop(i2c_bus);
|
|
if (ret == -EREMOTEIO)
|
|
return ret;
|
|
|
|
printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip,
|
|
retry);
|
|
if (ret != -ERESTART)
|
|
/* Disable controller */
|
|
writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift));
|
|
udelay(100);
|
|
if (i2c_idle_bus(i2c_bus) < 0)
|
|
break;
|
|
}
|
|
printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int i2c_write_data(struct mxc_i2c_bus *i2c_bus, u8 chip, const u8 *buf,
|
|
int len)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
debug("i2c_write_data: chip=0x%x, len=0x%x\n", chip, len);
|
|
debug("write_data: ");
|
|
/* use rc for counter */
|
|
for (i = 0; i < len; ++i)
|
|
debug(" 0x%02x", buf[i]);
|
|
debug("\n");
|
|
|
|
for (i = 0; i < len; i++) {
|
|
ret = tx_byte(i2c_bus, buf[i]);
|
|
if (ret < 0) {
|
|
debug("i2c_write_data(): rc=%d\n", ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Will generate a STOP after the last byte if "last" is true, i.e. this is the
|
|
* final message of a transaction. If not, it switches the bus back to TX mode
|
|
* and does not send a STOP, leaving the bus in a state where a repeated start
|
|
* and address can be sent for another message.
|
|
*/
|
|
static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf,
|
|
int len, bool last)
|
|
{
|
|
int ret;
|
|
unsigned int temp;
|
|
int i;
|
|
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
|
|
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
|
|
ulong base = i2c_bus->base;
|
|
|
|
debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len);
|
|
|
|
/* setup bus to read data */
|
|
temp = readb(base + (I2CR << reg_shift));
|
|
temp &= ~(I2CR_MTX | I2CR_TX_NO_AK);
|
|
if (len == 1)
|
|
temp |= I2CR_TX_NO_AK;
|
|
writeb(temp, base + (I2CR << reg_shift));
|
|
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
|
|
/* dummy read to clear ICF */
|
|
readb(base + (I2DR << reg_shift));
|
|
|
|
/* read data */
|
|
for (i = 0; i < len; i++) {
|
|
ret = wait_for_sr_state(i2c_bus, ST_IIF);
|
|
if (ret < 0) {
|
|
debug("i2c_read_data(): ret=%d\n", ret);
|
|
i2c_imx_stop(i2c_bus);
|
|
return ret;
|
|
}
|
|
|
|
if (i == (len - 1)) {
|
|
/* Final byte has already been received by master! When
|
|
* we read it from I2DR, the master will start another
|
|
* cycle. We must program it first to send a STOP or
|
|
* switch to TX to avoid this.
|
|
*/
|
|
if (last) {
|
|
i2c_imx_stop(i2c_bus);
|
|
} else {
|
|
/* Final read, no stop, switch back to tx */
|
|
temp = readb(base + (I2CR << reg_shift));
|
|
temp |= I2CR_MTX | I2CR_TX_NO_AK;
|
|
writeb(temp, base + (I2CR << reg_shift));
|
|
}
|
|
} else if (i == (len - 2)) {
|
|
/* Master has already recevied penultimate byte. When
|
|
* we read it from I2DR, master will start RX of final
|
|
* byte. We must set TX_NO_AK now so it does not ACK
|
|
* that final byte.
|
|
*/
|
|
temp = readb(base + (I2CR << reg_shift));
|
|
temp |= I2CR_TX_NO_AK;
|
|
writeb(temp, base + (I2CR << reg_shift));
|
|
}
|
|
|
|
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
|
|
buf[i] = readb(base + (I2DR << reg_shift));
|
|
}
|
|
|
|
/* reuse ret for counter*/
|
|
for (ret = 0; ret < len; ++ret)
|
|
debug(" 0x%02x", buf[ret]);
|
|
debug("\n");
|
|
|
|
/* It is not clear to me that this is necessary */
|
|
if (last)
|
|
i2c_imx_stop(i2c_bus);
|
|
return 0;
|
|
}
|
|
|
|
int __enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
|
|
__attribute__((weak, alias("__enable_i2c_clk")));
|
|
|
|
#ifndef CONFIG_DM_I2C
|
|
/*
|
|
* Read data from I2C device
|
|
*
|
|
* The transactions use the syntax defined in the Linux kernel I2C docs.
|
|
*
|
|
* If alen is > 0, then this function will send a transaction of the form:
|
|
* S Chip Wr [A] Addr [A] S Chip Rd [A] [data] A ... NA P
|
|
* This is a normal I2C register read: writing the register address, then doing
|
|
* a repeated start and reading the data.
|
|
*
|
|
* If alen == 0, then we get this transaction:
|
|
* S Chip Wr [A] S Chip Rd [A] [data] A ... NA P
|
|
* This is somewhat unusual, though valid, transaction. It addresses the chip
|
|
* in write mode, but doesn't actually write any register address or data, then
|
|
* does a repeated start and reads data.
|
|
*
|
|
* If alen < 0, then we get this transaction:
|
|
* S Chip Rd [A] [data] A ... NA P
|
|
* The chip is addressed in read mode and then data is read. No register
|
|
* address is written first. This is perfectly valid on most devices and
|
|
* required on some (usually those that don't act like an array of registers).
|
|
*/
|
|
static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
|
|
int alen, u8 *buf, int len)
|
|
{
|
|
int ret = 0;
|
|
u32 temp;
|
|
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
|
|
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
|
|
ulong base = i2c_bus->base;
|
|
|
|
ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (alen >= 0) {
|
|
temp = readb(base + (I2CR << reg_shift));
|
|
temp |= I2CR_RSTA;
|
|
writeb(temp, base + (I2CR << reg_shift));
|
|
}
|
|
|
|
ret = tx_byte(i2c_bus, (chip << 1) | 1);
|
|
if (ret < 0) {
|
|
i2c_imx_stop(i2c_bus);
|
|
return ret;
|
|
}
|
|
|
|
ret = i2c_read_data(i2c_bus, chip, buf, len, true);
|
|
|
|
i2c_imx_stop(i2c_bus);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Write data to I2C device
|
|
*
|
|
* If alen > 0, we get this transaction:
|
|
* S Chip Wr [A] addr [A] data [A] ... [A] P
|
|
* An ordinary write register command.
|
|
*
|
|
* If alen == 0, then we get this:
|
|
* S Chip Wr [A] data [A] ... [A] P
|
|
* This is a simple I2C write.
|
|
*
|
|
* If alen < 0, then we get this:
|
|
* S data [A] ... [A] P
|
|
* This is most likely NOT something that should be used. It doesn't send the
|
|
* chip address first, so in effect, the first byte of data will be used as the
|
|
* address.
|
|
*/
|
|
static int bus_i2c_write(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
|
|
int alen, const u8 *buf, int len)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_write_data(i2c_bus, chip, buf, len);
|
|
|
|
i2c_imx_stop(i2c_bus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if !defined(I2C2_BASE_ADDR)
|
|
#define I2C2_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C3_BASE_ADDR)
|
|
#define I2C3_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C4_BASE_ADDR)
|
|
#define I2C4_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C5_BASE_ADDR)
|
|
#define I2C5_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C6_BASE_ADDR)
|
|
#define I2C6_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C7_BASE_ADDR)
|
|
#define I2C7_BASE_ADDR 0
|
|
#endif
|
|
|
|
#if !defined(I2C8_BASE_ADDR)
|
|
#define I2C8_BASE_ADDR 0
|
|
#endif
|
|
|
|
static struct mxc_i2c_bus mxc_i2c_buses[] = {
|
|
#if defined(CONFIG_ARCH_LS1021A) || defined(CONFIG_VF610) || \
|
|
defined(CONFIG_FSL_LAYERSCAPE)
|
|
{ 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 3, I2C4_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 4, I2C5_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 5, I2C6_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 6, I2C7_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
{ 7, I2C8_BASE_ADDR, I2C_QUIRK_FLAG },
|
|
#else
|
|
{ 0, I2C1_BASE_ADDR, 0 },
|
|
{ 1, I2C2_BASE_ADDR, 0 },
|
|
{ 2, I2C3_BASE_ADDR, 0 },
|
|
{ 3, I2C4_BASE_ADDR, 0 },
|
|
{ 4, I2C5_BASE_ADDR, 0 },
|
|
{ 5, I2C6_BASE_ADDR, 0 },
|
|
{ 6, I2C7_BASE_ADDR, 0 },
|
|
{ 7, I2C8_BASE_ADDR, 0 },
|
|
#endif
|
|
};
|
|
|
|
struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap)
|
|
{
|
|
return &mxc_i2c_buses[adap->hwadapnr];
|
|
}
|
|
|
|
static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip,
|
|
uint addr, int alen, uint8_t *buffer,
|
|
int len)
|
|
{
|
|
return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len);
|
|
}
|
|
|
|
static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip,
|
|
uint addr, int alen, uint8_t *buffer,
|
|
int len)
|
|
{
|
|
return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len);
|
|
}
|
|
|
|
/*
|
|
* Test if a chip at a given address responds (probe the chip)
|
|
*/
|
|
static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip)
|
|
{
|
|
return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0);
|
|
}
|
|
|
|
void bus_i2c_init(int index, int speed, int unused,
|
|
int (*idle_bus_fn)(void *p), void *idle_bus_data)
|
|
{
|
|
int ret;
|
|
|
|
if (index >= ARRAY_SIZE(mxc_i2c_buses)) {
|
|
debug("Error i2c index\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Warning: Be careful to allow the assignment to a static
|
|
* variable here. This function could be called while U-Boot is
|
|
* still running in flash memory. So such assignment is equal
|
|
* to write data to flash without erasing.
|
|
*/
|
|
if (idle_bus_fn)
|
|
mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn;
|
|
if (idle_bus_data)
|
|
mxc_i2c_buses[index].idle_bus_data = idle_bus_data;
|
|
|
|
ret = enable_i2c_clk(1, index);
|
|
if (ret < 0) {
|
|
debug("I2C-%d clk fail to enable.\n", index);
|
|
return;
|
|
}
|
|
|
|
bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed);
|
|
}
|
|
|
|
/*
|
|
* Early init I2C for prepare read the clk through I2C.
|
|
*/
|
|
void i2c_early_init_f(void)
|
|
{
|
|
ulong base = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].base;
|
|
bool quirk = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].driver_data
|
|
& I2C_QUIRK_FLAG ? true : false;
|
|
int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
|
|
|
|
/* Set I2C divider value */
|
|
writeb(I2C_IFDR_DIV_CONSERVATIVE, base + (IFDR << reg_shift));
|
|
/* Reset module */
|
|
writeb(I2CR_IDIS, base + (I2CR << reg_shift));
|
|
writeb(0, base + (I2SR << reg_shift));
|
|
/* Enable I2C */
|
|
writeb(I2CR_IEN, base + (I2CR << reg_shift));
|
|
}
|
|
|
|
/*
|
|
* Init I2C Bus
|
|
*/
|
|
static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
|
|
{
|
|
bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Set I2C Speed
|
|
*/
|
|
static u32 mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed)
|
|
{
|
|
return bus_i2c_set_bus_speed(i2c_get_base(adap), speed);
|
|
}
|
|
|
|
/*
|
|
* Register mxc i2c adapters
|
|
*/
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C1
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C1_SPEED,
|
|
CONFIG_SYS_MXC_I2C1_SLAVE, 0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C2
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C2_SPEED,
|
|
CONFIG_SYS_MXC_I2C2_SLAVE, 1)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C3
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C3_SPEED,
|
|
CONFIG_SYS_MXC_I2C3_SLAVE, 2)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C4
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C4_SPEED,
|
|
CONFIG_SYS_MXC_I2C4_SLAVE, 3)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C5
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc4, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C5_SPEED,
|
|
CONFIG_SYS_MXC_I2C5_SLAVE, 4)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C6
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc5, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C6_SPEED,
|
|
CONFIG_SYS_MXC_I2C6_SLAVE, 5)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C7
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc6, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C7_SPEED,
|
|
CONFIG_SYS_MXC_I2C7_SLAVE, 6)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_I2C_MXC_I2C8
|
|
U_BOOT_I2C_ADAP_COMPLETE(mxc7, mxc_i2c_init, mxc_i2c_probe,
|
|
mxc_i2c_read, mxc_i2c_write,
|
|
mxc_i2c_set_bus_speed,
|
|
CONFIG_SYS_MXC_I2C8_SPEED,
|
|
CONFIG_SYS_MXC_I2C8_SLAVE, 7)
|
|
#endif
|
|
|
|
#else
|
|
|
|
static int mxc_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
|
|
{
|
|
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
|
|
|
|
return bus_i2c_set_bus_speed(i2c_bus, speed);
|
|
}
|
|
|
|
static int mxc_i2c_probe(struct udevice *bus)
|
|
{
|
|
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
|
|
const void *fdt = gd->fdt_blob;
|
|
int node = dev_of_offset(bus);
|
|
fdt_addr_t addr;
|
|
int ret, ret2;
|
|
|
|
i2c_bus->driver_data = dev_get_driver_data(bus);
|
|
|
|
addr = devfdt_get_addr(bus);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
i2c_bus->base = addr;
|
|
i2c_bus->index = bus->seq;
|
|
i2c_bus->bus = bus;
|
|
|
|
/* Enable clk */
|
|
#if CONFIG_IS_ENABLED(CLK)
|
|
ret = clk_get_by_index(bus, 0, &i2c_bus->per_clk);
|
|
if (ret) {
|
|
printf("Failed to get i2c clk\n");
|
|
return ret;
|
|
}
|
|
ret = clk_enable(&i2c_bus->per_clk);
|
|
if (ret) {
|
|
printf("Failed to enable i2c clk\n");
|
|
return ret;
|
|
}
|
|
#else
|
|
ret = enable_i2c_clk(1, bus->seq);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
|
|
/*
|
|
* See Documentation/devicetree/bindings/i2c/i2c-imx.txt
|
|
* Use gpio to force bus idle when necessary.
|
|
*/
|
|
ret = fdt_stringlist_search(fdt, node, "pinctrl-names", "gpio");
|
|
if (ret < 0) {
|
|
debug("i2c bus %d at 0x%2lx, no gpio pinctrl state.\n", bus->seq, i2c_bus->base);
|
|
} else {
|
|
ret = gpio_request_by_name_nodev(offset_to_ofnode(node),
|
|
"scl-gpios", 0, &i2c_bus->scl_gpio,
|
|
GPIOD_IS_OUT);
|
|
ret2 = gpio_request_by_name_nodev(offset_to_ofnode(node),
|
|
"sda-gpios", 0, &i2c_bus->sda_gpio,
|
|
GPIOD_IS_OUT);
|
|
if (!dm_gpio_is_valid(&i2c_bus->sda_gpio) ||
|
|
!dm_gpio_is_valid(&i2c_bus->scl_gpio) ||
|
|
ret || ret2) {
|
|
dev_err(dev, "i2c bus %d at %lu, fail to request scl/sda gpio\n", bus->seq, i2c_bus->base);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Pinmux settings are in board file now, until pinmux is supported,
|
|
* we can set pinmux here in probe function.
|
|
*/
|
|
|
|
debug("i2c : controller bus %d at %lu , speed %d: ",
|
|
bus->seq, i2c_bus->base,
|
|
i2c_bus->speed);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Sends: S Addr Wr [A|NA] P */
|
|
static int mxc_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
|
|
u32 chip_flags)
|
|
{
|
|
int ret;
|
|
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
|
|
|
|
ret = i2c_init_transfer(i2c_bus, chip_addr, 0, 0);
|
|
if (ret < 0) {
|
|
debug("%s failed, ret = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
i2c_imx_stop(i2c_bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxc_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
|
|
{
|
|
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
|
|
int ret = 0;
|
|
ulong base = i2c_bus->base;
|
|
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
|
|
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
|
|
int read_mode;
|
|
|
|
/* Here address len is set to -1 to not send any address at first.
|
|
* Otherwise i2c_init_transfer will send the chip address with write
|
|
* mode set. This is wrong if the 1st message is read.
|
|
*/
|
|
ret = i2c_init_transfer(i2c_bus, msg->addr, 0, -1);
|
|
if (ret < 0) {
|
|
debug("i2c_init_transfer error: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
read_mode = -1; /* So it's always different on the first message */
|
|
for (; nmsgs > 0; nmsgs--, msg++) {
|
|
const int msg_is_read = !!(msg->flags & I2C_M_RD);
|
|
|
|
debug("i2c_xfer: chip=0x%x, len=0x%x, dir=%c\n", msg->addr,
|
|
msg->len, msg_is_read ? 'R' : 'W');
|
|
|
|
if (msg_is_read != read_mode) {
|
|
/* Send repeated start if not 1st message */
|
|
if (read_mode != -1) {
|
|
debug("i2c_xfer: [RSTART]\n");
|
|
ret = readb(base + (I2CR << reg_shift));
|
|
ret |= I2CR_RSTA;
|
|
writeb(ret, base + (I2CR << reg_shift));
|
|
}
|
|
debug("i2c_xfer: [ADDR %02x | %c]\n", msg->addr,
|
|
msg_is_read ? 'R' : 'W');
|
|
ret = tx_byte(i2c_bus, (msg->addr << 1) | msg_is_read);
|
|
if (ret < 0) {
|
|
debug("i2c_xfer: [STOP]\n");
|
|
i2c_imx_stop(i2c_bus);
|
|
break;
|
|
}
|
|
read_mode = msg_is_read;
|
|
}
|
|
|
|
if (msg->flags & I2C_M_RD)
|
|
ret = i2c_read_data(i2c_bus, msg->addr, msg->buf,
|
|
msg->len, nmsgs == 1 ||
|
|
(msg->flags & I2C_M_STOP));
|
|
else
|
|
ret = i2c_write_data(i2c_bus, msg->addr, msg->buf,
|
|
msg->len);
|
|
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
if (ret)
|
|
debug("i2c_write: error sending\n");
|
|
|
|
i2c_imx_stop(i2c_bus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct dm_i2c_ops mxc_i2c_ops = {
|
|
.xfer = mxc_i2c_xfer,
|
|
.probe_chip = mxc_i2c_probe_chip,
|
|
.set_bus_speed = mxc_i2c_set_bus_speed,
|
|
};
|
|
|
|
static const struct udevice_id mxc_i2c_ids[] = {
|
|
{ .compatible = "fsl,imx21-i2c", },
|
|
{ .compatible = "fsl,vf610-i2c", .data = I2C_QUIRK_FLAG, },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(i2c_mxc) = {
|
|
.name = "i2c_mxc",
|
|
.id = UCLASS_I2C,
|
|
.of_match = mxc_i2c_ids,
|
|
.probe = mxc_i2c_probe,
|
|
.priv_auto_alloc_size = sizeof(struct mxc_i2c_bus),
|
|
.ops = &mxc_i2c_ops,
|
|
};
|
|
#endif
|