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a405764c1e
Most of the I2C slaves support accesses in the typical style
that is : read/write series of bytes at particular address offset.
These transactions look like:"
(1) START:Address:Tx:Offset:RESTART:Address[0..4]:Tx/Rx:data[0..n]:STOP"
However there are certain devices which support accesses in
terms of the transactions as follows:
(2) "START:Address:Tx:Txdata[0..n1]:Clock_stretching:
RESTART:Address:Rx:data[0..n2]"
Here Txdata is typically a command and some associated data,
similarly Rxdata could be command status plus some data received
as a response to the command sent.
Type (1) transactions are currently supportd in the
i2c driver using i2c_read and i2c_write APIs. I2C EEPROMs,
RTC, etc fall in this category.
To handle type (2) along with type (1) transactions,
i2c_read() function has been modified.
Signed-off-by: Shaveta Leekha <shaveta@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
541 lines
14 KiB
C
541 lines
14 KiB
C
/*
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* Copyright 2006,2009 Freescale Semiconductor, Inc.
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*
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* 2012, Heiko Schocher, DENX Software Engineering, hs@denx.de.
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* Changes for multibus/multiadapter I2C support.
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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
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* Version 2 as published by the Free Software Foundation.
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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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <i2c.h> /* Functional interface */
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#include <asm/io.h>
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#include <asm/fsl_i2c.h> /* HW definitions */
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/* The maximum number of microseconds we will wait until another master has
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* released the bus. If not defined in the board header file, then use a
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* generic value.
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*/
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#ifndef CONFIG_I2C_MBB_TIMEOUT
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#define CONFIG_I2C_MBB_TIMEOUT 100000
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#endif
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/* The maximum number of microseconds we will wait for a read or write
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* operation to complete. If not defined in the board header file, then use a
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* generic value.
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*/
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#ifndef CONFIG_I2C_TIMEOUT
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#define CONFIG_I2C_TIMEOUT 10000
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#endif
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#define I2C_READ_BIT 1
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#define I2C_WRITE_BIT 0
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DECLARE_GLOBAL_DATA_PTR;
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static const struct fsl_i2c *i2c_dev[2] = {
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(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C_OFFSET),
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#ifdef CONFIG_SYS_FSL_I2C2_OFFSET
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(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C2_OFFSET)
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#endif
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};
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/* I2C speed map for a DFSR value of 1 */
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/*
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* Map I2C frequency dividers to FDR and DFSR values
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*
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* This structure is used to define the elements of a table that maps I2C
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* frequency divider (I2C clock rate divided by I2C bus speed) to a value to be
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* programmed into the Frequency Divider Ratio (FDR) and Digital Filter
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* Sampling Rate (DFSR) registers.
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*
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* The actual table should be defined in the board file, and it must be called
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* fsl_i2c_speed_map[].
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*
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* The last entry of the table must have a value of {-1, X}, where X is same
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* FDR/DFSR values as the second-to-last entry. This guarantees that any
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* search through the array will always find a match.
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*
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* The values of the divider must be in increasing numerical order, i.e.
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* fsl_i2c_speed_map[x+1].divider > fsl_i2c_speed_map[x].divider.
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*
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* For this table, the values are based on a value of 1 for the DFSR
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* register. See the application note AN2919 "Determining the I2C Frequency
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* Divider Ratio for SCL"
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*
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* ColdFire I2C frequency dividers for FDR values are different from
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* PowerPC. The protocol to use the I2C module is still the same.
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* A different table is defined and are based on MCF5xxx user manual.
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*
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*/
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static const struct {
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unsigned short divider;
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u8 fdr;
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} fsl_i2c_speed_map[] = {
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#ifdef __M68K__
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{20, 32}, {22, 33}, {24, 34}, {26, 35},
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{28, 0}, {28, 36}, {30, 1}, {32, 37},
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{34, 2}, {36, 38}, {40, 3}, {40, 39},
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{44, 4}, {48, 5}, {48, 40}, {56, 6},
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{56, 41}, {64, 42}, {68, 7}, {72, 43},
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{80, 8}, {80, 44}, {88, 9}, {96, 41},
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{104, 10}, {112, 42}, {128, 11}, {128, 43},
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{144, 12}, {160, 13}, {160, 48}, {192, 14},
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{192, 49}, {224, 50}, {240, 15}, {256, 51},
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{288, 16}, {320, 17}, {320, 52}, {384, 18},
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{384, 53}, {448, 54}, {480, 19}, {512, 55},
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{576, 20}, {640, 21}, {640, 56}, {768, 22},
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{768, 57}, {960, 23}, {896, 58}, {1024, 59},
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{1152, 24}, {1280, 25}, {1280, 60}, {1536, 26},
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{1536, 61}, {1792, 62}, {1920, 27}, {2048, 63},
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{2304, 28}, {2560, 29}, {3072, 30}, {3840, 31},
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{-1, 31}
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#endif
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};
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/**
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* Set the I2C bus speed for a given I2C device
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*
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* @param dev: the I2C device
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* @i2c_clk: I2C bus clock frequency
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* @speed: the desired speed of the bus
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*
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* The I2C device must be stopped before calling this function.
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*
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* The return value is the actual bus speed that is set.
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*/
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static unsigned int set_i2c_bus_speed(const struct fsl_i2c *dev,
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unsigned int i2c_clk, unsigned int speed)
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{
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unsigned short divider = min(i2c_clk / speed, (unsigned short) -1);
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/*
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* We want to choose an FDR/DFSR that generates an I2C bus speed that
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* is equal to or lower than the requested speed. That means that we
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* want the first divider that is equal to or greater than the
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* calculated divider.
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*/
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#ifdef __PPC__
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u8 dfsr, fdr = 0x31; /* Default if no FDR found */
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/* a, b and dfsr matches identifiers A,B and C respectively in AN2919 */
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unsigned short a, b, ga, gb;
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unsigned long c_div, est_div;
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#ifdef CONFIG_FSL_I2C_CUSTOM_DFSR
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dfsr = CONFIG_FSL_I2C_CUSTOM_DFSR;
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#else
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/* Condition 1: dfsr <= 50/T */
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dfsr = (5 * (i2c_clk / 1000)) / 100000;
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#endif
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#ifdef CONFIG_FSL_I2C_CUSTOM_FDR
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fdr = CONFIG_FSL_I2C_CUSTOM_FDR;
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speed = i2c_clk / divider; /* Fake something */
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#else
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debug("Requested speed:%d, i2c_clk:%d\n", speed, i2c_clk);
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if (!dfsr)
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dfsr = 1;
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est_div = ~0;
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for (ga = 0x4, a = 10; a <= 30; ga++, a += 2) {
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for (gb = 0; gb < 8; gb++) {
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b = 16 << gb;
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c_div = b * (a + ((3*dfsr)/b)*2);
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if ((c_div > divider) && (c_div < est_div)) {
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unsigned short bin_gb, bin_ga;
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est_div = c_div;
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bin_gb = gb << 2;
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bin_ga = (ga & 0x3) | ((ga & 0x4) << 3);
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fdr = bin_gb | bin_ga;
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speed = i2c_clk / est_div;
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debug("FDR:0x%.2x, div:%ld, ga:0x%x, gb:0x%x, "
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"a:%d, b:%d, speed:%d\n",
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fdr, est_div, ga, gb, a, b, speed);
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/* Condition 2 not accounted for */
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debug("Tr <= %d ns\n",
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(b - 3 * dfsr) * 1000000 /
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(i2c_clk / 1000));
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}
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}
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if (a == 20)
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a += 2;
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if (a == 24)
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a += 4;
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}
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debug("divider:%d, est_div:%ld, DFSR:%d\n", divider, est_div, dfsr);
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debug("FDR:0x%.2x, speed:%d\n", fdr, speed);
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#endif
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writeb(dfsr, &dev->dfsrr); /* set default filter */
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writeb(fdr, &dev->fdr); /* set bus speed */
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#else
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(fsl_i2c_speed_map); i++)
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if (fsl_i2c_speed_map[i].divider >= divider) {
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u8 fdr;
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fdr = fsl_i2c_speed_map[i].fdr;
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speed = i2c_clk / fsl_i2c_speed_map[i].divider;
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writeb(fdr, &dev->fdr); /* set bus speed */
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break;
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}
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#endif
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return speed;
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}
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static unsigned int get_i2c_clock(int bus)
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{
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if (bus)
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return gd->arch.i2c2_clk; /* I2C2 clock */
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else
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return gd->arch.i2c1_clk; /* I2C1 clock */
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}
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static int fsl_i2c_fixup(const struct fsl_i2c *dev)
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{
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const unsigned long long timeout = usec2ticks(CONFIG_I2C_MBB_TIMEOUT);
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unsigned long long timeval = 0;
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int ret = -1;
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unsigned int flags = 0;
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#ifdef CONFIG_SYS_FSL_ERRATUM_I2C_A004447
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unsigned int svr = get_svr();
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if ((SVR_SOC_VER(svr) == SVR_8548 && IS_SVR_REV(svr, 3, 1)) ||
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(SVR_REV(svr) <= CONFIG_SYS_FSL_A004447_SVR_REV))
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flags = I2C_CR_BIT6;
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#endif
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writeb(I2C_CR_MEN | I2C_CR_MSTA, &dev->cr);
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timeval = get_ticks();
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while (!(readb(&dev->sr) & I2C_SR_MBB)) {
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if ((get_ticks() - timeval) > timeout)
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goto err;
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}
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if (readb(&dev->sr) & I2C_SR_MAL) {
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/* SDA is stuck low */
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writeb(0, &dev->cr);
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udelay(100);
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writeb(I2C_CR_MSTA | flags, &dev->cr);
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writeb(I2C_CR_MEN | I2C_CR_MSTA | flags, &dev->cr);
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}
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readb(&dev->dr);
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timeval = get_ticks();
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while (!(readb(&dev->sr) & I2C_SR_MIF)) {
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if ((get_ticks() - timeval) > timeout)
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goto err;
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}
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ret = 0;
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err:
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writeb(I2C_CR_MEN | flags, &dev->cr);
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writeb(0, &dev->sr);
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udelay(100);
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return ret;
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}
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static void fsl_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
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{
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const struct fsl_i2c *dev;
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const unsigned long long timeout = usec2ticks(CONFIG_I2C_MBB_TIMEOUT);
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unsigned long long timeval;
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#ifdef CONFIG_SYS_I2C_INIT_BOARD
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/* Call board specific i2c bus reset routine before accessing the
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* environment, which might be in a chip on that bus. For details
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* about this problem see doc/I2C_Edge_Conditions.
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*/
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i2c_init_board();
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#endif
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dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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writeb(0, &dev->cr); /* stop I2C controller */
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udelay(5); /* let it shutdown in peace */
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set_i2c_bus_speed(dev, get_i2c_clock(adap->hwadapnr), speed);
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writeb(slaveadd << 1, &dev->adr);/* write slave address */
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writeb(0x0, &dev->sr); /* clear status register */
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writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */
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timeval = get_ticks();
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while (readb(&dev->sr) & I2C_SR_MBB) {
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if ((get_ticks() - timeval) < timeout)
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continue;
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if (fsl_i2c_fixup(dev))
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debug("i2c_init: BUS#%d failed to init\n",
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adap->hwadapnr);
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break;
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}
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#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
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/* Call board specific i2c bus reset routine AFTER the bus has been
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* initialized. Use either this callpoint or i2c_init_board;
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* which is called before i2c_init operations.
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* For details about this problem see doc/I2C_Edge_Conditions.
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*/
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i2c_board_late_init();
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#endif
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}
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static int
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i2c_wait4bus(struct i2c_adapter *adap)
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{
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struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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unsigned long long timeval = get_ticks();
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const unsigned long long timeout = usec2ticks(CONFIG_I2C_MBB_TIMEOUT);
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while (readb(&dev->sr) & I2C_SR_MBB) {
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if ((get_ticks() - timeval) > timeout)
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return -1;
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}
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return 0;
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}
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static __inline__ int
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i2c_wait(struct i2c_adapter *adap, int write)
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{
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u32 csr;
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unsigned long long timeval = get_ticks();
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const unsigned long long timeout = usec2ticks(CONFIG_I2C_TIMEOUT);
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struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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do {
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csr = readb(&dev->sr);
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if (!(csr & I2C_SR_MIF))
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continue;
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/* Read again to allow register to stabilise */
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csr = readb(&dev->sr);
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writeb(0x0, &dev->sr);
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if (csr & I2C_SR_MAL) {
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debug("i2c_wait: MAL\n");
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return -1;
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}
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if (!(csr & I2C_SR_MCF)) {
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debug("i2c_wait: unfinished\n");
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return -1;
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}
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if (write == I2C_WRITE_BIT && (csr & I2C_SR_RXAK)) {
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debug("i2c_wait: No RXACK\n");
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return -1;
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}
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return 0;
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} while ((get_ticks() - timeval) < timeout);
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debug("i2c_wait: timed out\n");
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return -1;
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}
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static __inline__ int
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i2c_write_addr(struct i2c_adapter *adap, u8 dev, u8 dir, int rsta)
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{
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struct fsl_i2c *device = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX
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| (rsta ? I2C_CR_RSTA : 0),
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&device->cr);
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writeb((dev << 1) | dir, &device->dr);
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if (i2c_wait(adap, I2C_WRITE_BIT) < 0)
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return 0;
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return 1;
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}
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static __inline__ int
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__i2c_write(struct i2c_adapter *adap, u8 *data, int length)
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{
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struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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int i;
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for (i = 0; i < length; i++) {
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writeb(data[i], &dev->dr);
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if (i2c_wait(adap, I2C_WRITE_BIT) < 0)
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break;
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}
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return i;
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}
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static __inline__ int
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__i2c_read(struct i2c_adapter *adap, u8 *data, int length)
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{
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struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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int i;
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writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0),
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&dev->cr);
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/* dummy read */
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readb(&dev->dr);
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for (i = 0; i < length; i++) {
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if (i2c_wait(adap, I2C_READ_BIT) < 0)
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break;
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|
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/* Generate ack on last next to last byte */
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if (i == length - 2)
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writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK,
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&dev->cr);
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|
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/* Do not generate stop on last byte */
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if (i == length - 1)
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writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX,
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&dev->cr);
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|
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data[i] = readb(&dev->dr);
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}
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|
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return i;
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}
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|
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static int
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fsl_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr, int alen, u8 *data,
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int length)
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{
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struct fsl_i2c *device = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
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int i = -1; /* signal error */
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u8 *a = (u8*)&addr;
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int len = alen * -1;
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|
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if (i2c_wait4bus(adap) < 0)
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return -1;
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|
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/* To handle the need of I2C devices that require to write few bytes
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* (more than 4 bytes of address as in the case of else part)
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* of data before reading, Negative equivalent of length(bytes to write)
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* is passed, but used the +ve part of len for writing data
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*/
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if (alen < 0) {
|
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/* Generate a START and send the Address and
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* the Tx Bytes to the slave.
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|
* "START: Address: Write bytes data[len]"
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* IF part supports writing any number of bytes in contrast
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* to the else part, which supports writing address offset
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* of upto 4 bytes only.
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* bytes that need to be written are passed in
|
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* "data", which will eventually keep the data READ,
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* after writing the len bytes out of it
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*/
|
|
if (i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0)
|
|
i = __i2c_write(adap, data, len);
|
|
|
|
if (i != len)
|
|
return -1;
|
|
|
|
if (length && i2c_write_addr(adap, dev, I2C_READ_BIT, 1) != 0)
|
|
i = __i2c_read(adap, data, length);
|
|
} else {
|
|
if ((!length || alen > 0) &&
|
|
i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0 &&
|
|
__i2c_write(adap, &a[4 - alen], alen) == alen)
|
|
i = 0; /* No error so far */
|
|
|
|
if (length &&
|
|
i2c_write_addr(adap, dev, I2C_READ_BIT, alen ? 1 : 0) != 0)
|
|
i = __i2c_read(adap, data, length);
|
|
}
|
|
|
|
writeb(I2C_CR_MEN, &device->cr);
|
|
|
|
if (i2c_wait4bus(adap)) /* Wait until STOP */
|
|
debug("i2c_read: wait4bus timed out\n");
|
|
|
|
if (i == length)
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
fsl_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr, int alen,
|
|
u8 *data, int length)
|
|
{
|
|
struct fsl_i2c *device = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
|
|
int i = -1; /* signal error */
|
|
u8 *a = (u8*)&addr;
|
|
|
|
if (i2c_wait4bus(adap) < 0)
|
|
return -1;
|
|
|
|
if (i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0 &&
|
|
__i2c_write(adap, &a[4 - alen], alen) == alen) {
|
|
i = __i2c_write(adap, data, length);
|
|
}
|
|
|
|
writeb(I2C_CR_MEN, &device->cr);
|
|
if (i2c_wait4bus(adap)) /* Wait until STOP */
|
|
debug("i2c_write: wait4bus timed out\n");
|
|
|
|
if (i == length)
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
fsl_i2c_probe(struct i2c_adapter *adap, uchar chip)
|
|
{
|
|
struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
|
|
/* For unknow reason the controller will ACK when
|
|
* probing for a slave with the same address, so skip
|
|
* it.
|
|
*/
|
|
if (chip == (readb(&dev->adr) >> 1))
|
|
return -1;
|
|
|
|
return fsl_i2c_read(adap, chip, 0, 0, NULL, 0);
|
|
}
|
|
|
|
static unsigned int fsl_i2c_set_bus_speed(struct i2c_adapter *adap,
|
|
unsigned int speed)
|
|
{
|
|
struct fsl_i2c *dev = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
|
|
|
|
writeb(0, &dev->cr); /* stop controller */
|
|
set_i2c_bus_speed(dev, get_i2c_clock(adap->hwadapnr), speed);
|
|
writeb(I2C_CR_MEN, &dev->cr); /* start controller */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Register fsl i2c adapters
|
|
*/
|
|
U_BOOT_I2C_ADAP_COMPLETE(fsl_0, fsl_i2c_init, fsl_i2c_probe, fsl_i2c_read,
|
|
fsl_i2c_write, fsl_i2c_set_bus_speed,
|
|
CONFIG_SYS_FSL_I2C_SPEED, CONFIG_SYS_FSL_I2C_SLAVE,
|
|
0)
|
|
#ifdef CONFIG_SYS_FSL_I2C2_OFFSET
|
|
U_BOOT_I2C_ADAP_COMPLETE(fsl_1, fsl_i2c_init, fsl_i2c_probe, fsl_i2c_read,
|
|
fsl_i2c_write, fsl_i2c_set_bus_speed,
|
|
CONFIG_SYS_FSL_I2C2_SPEED, CONFIG_SYS_FSL_I2C2_SLAVE,
|
|
1)
|
|
#endif
|