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593308259b
Use the function resource_size, which reduces the chance of introducing off-by-one errors in calculating the resource size. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ struct resource *res; @@ - (res->end - res->start) + 1 + resource_size(res) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
636 lines
16 KiB
C
636 lines
16 KiB
C
/*
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* TI DAVINCI I2C adapter driver.
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*
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* Copyright (C) 2006 Texas Instruments.
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* Copyright (C) 2007 MontaVista Software Inc.
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*
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* Updated by Vinod & Sudhakar Feb 2005
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*
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* ----------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ----------------------------------------------------------------------------
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/clk.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/i2c.h>
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/* ----- global defines ----------------------------------------------- */
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#define DAVINCI_I2C_TIMEOUT (1*HZ)
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#define I2C_DAVINCI_INTR_ALL (DAVINCI_I2C_IMR_AAS | \
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DAVINCI_I2C_IMR_SCD | \
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DAVINCI_I2C_IMR_ARDY | \
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DAVINCI_I2C_IMR_NACK | \
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DAVINCI_I2C_IMR_AL)
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#define DAVINCI_I2C_OAR_REG 0x00
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#define DAVINCI_I2C_IMR_REG 0x04
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#define DAVINCI_I2C_STR_REG 0x08
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#define DAVINCI_I2C_CLKL_REG 0x0c
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#define DAVINCI_I2C_CLKH_REG 0x10
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#define DAVINCI_I2C_CNT_REG 0x14
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#define DAVINCI_I2C_DRR_REG 0x18
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#define DAVINCI_I2C_SAR_REG 0x1c
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#define DAVINCI_I2C_DXR_REG 0x20
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#define DAVINCI_I2C_MDR_REG 0x24
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#define DAVINCI_I2C_IVR_REG 0x28
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#define DAVINCI_I2C_EMDR_REG 0x2c
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#define DAVINCI_I2C_PSC_REG 0x30
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#define DAVINCI_I2C_IVR_AAS 0x07
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#define DAVINCI_I2C_IVR_SCD 0x06
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#define DAVINCI_I2C_IVR_XRDY 0x05
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#define DAVINCI_I2C_IVR_RDR 0x04
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#define DAVINCI_I2C_IVR_ARDY 0x03
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#define DAVINCI_I2C_IVR_NACK 0x02
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#define DAVINCI_I2C_IVR_AL 0x01
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#define DAVINCI_I2C_STR_BB (1 << 12)
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#define DAVINCI_I2C_STR_RSFULL (1 << 11)
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#define DAVINCI_I2C_STR_SCD (1 << 5)
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#define DAVINCI_I2C_STR_ARDY (1 << 2)
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#define DAVINCI_I2C_STR_NACK (1 << 1)
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#define DAVINCI_I2C_STR_AL (1 << 0)
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#define DAVINCI_I2C_MDR_NACK (1 << 15)
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#define DAVINCI_I2C_MDR_STT (1 << 13)
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#define DAVINCI_I2C_MDR_STP (1 << 11)
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#define DAVINCI_I2C_MDR_MST (1 << 10)
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#define DAVINCI_I2C_MDR_TRX (1 << 9)
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#define DAVINCI_I2C_MDR_XA (1 << 8)
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#define DAVINCI_I2C_MDR_RM (1 << 7)
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#define DAVINCI_I2C_MDR_IRS (1 << 5)
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#define DAVINCI_I2C_IMR_AAS (1 << 6)
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#define DAVINCI_I2C_IMR_SCD (1 << 5)
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#define DAVINCI_I2C_IMR_XRDY (1 << 4)
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#define DAVINCI_I2C_IMR_RRDY (1 << 3)
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#define DAVINCI_I2C_IMR_ARDY (1 << 2)
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#define DAVINCI_I2C_IMR_NACK (1 << 1)
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#define DAVINCI_I2C_IMR_AL (1 << 0)
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#define MOD_REG_BIT(val, mask, set) do { \
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if (set) { \
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val |= mask; \
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} else { \
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val &= ~mask; \
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} \
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} while (0)
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struct davinci_i2c_dev {
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struct device *dev;
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void __iomem *base;
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struct completion cmd_complete;
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struct clk *clk;
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int cmd_err;
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u8 *buf;
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size_t buf_len;
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int irq;
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u8 terminate;
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struct i2c_adapter adapter;
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};
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/* default platform data to use if not supplied in the platform_device */
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static struct davinci_i2c_platform_data davinci_i2c_platform_data_default = {
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.bus_freq = 100,
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.bus_delay = 0,
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};
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static inline void davinci_i2c_write_reg(struct davinci_i2c_dev *i2c_dev,
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int reg, u16 val)
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{
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__raw_writew(val, i2c_dev->base + reg);
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}
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static inline u16 davinci_i2c_read_reg(struct davinci_i2c_dev *i2c_dev, int reg)
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{
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return __raw_readw(i2c_dev->base + reg);
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}
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/*
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* This functions configures I2C and brings I2C out of reset.
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* This function is called during I2C init function. This function
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* also gets called if I2C encounters any errors.
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*/
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static int i2c_davinci_init(struct davinci_i2c_dev *dev)
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{
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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u16 psc;
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u32 clk;
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u32 d;
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u32 clkh;
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u32 clkl;
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u32 input_clock = clk_get_rate(dev->clk);
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u16 w;
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if (!pdata)
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pdata = &davinci_i2c_platform_data_default;
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/* put I2C into reset */
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w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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MOD_REG_BIT(w, DAVINCI_I2C_MDR_IRS, 0);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
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/* NOTE: I2C Clock divider programming info
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* As per I2C specs the following formulas provide prescaler
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* and low/high divider values
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* input clk --> PSC Div -----------> ICCL/H Div --> output clock
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* module clk
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*
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* output clk = module clk / (PSC + 1) [ (ICCL + d) + (ICCH + d) ]
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*
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* Thus,
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* (ICCL + ICCH) = clk = (input clk / ((psc +1) * output clk)) - 2d;
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*
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* where if PSC == 0, d = 7,
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* if PSC == 1, d = 6
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* if PSC > 1 , d = 5
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*/
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/* get minimum of 7 MHz clock, but max of 12 MHz */
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psc = (input_clock / 7000000) - 1;
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if ((input_clock / (psc + 1)) > 12000000)
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psc++; /* better to run under spec than over */
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d = (psc >= 2) ? 5 : 7 - psc;
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clk = ((input_clock / (psc + 1)) / (pdata->bus_freq * 1000)) - (d << 1);
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clkh = clk >> 1;
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clkl = clk - clkh;
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davinci_i2c_write_reg(dev, DAVINCI_I2C_PSC_REG, psc);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKH_REG, clkh);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKL_REG, clkl);
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/* Respond at reserved "SMBus Host" slave address" (and zero);
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* we seem to have no option to not respond...
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*/
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davinci_i2c_write_reg(dev, DAVINCI_I2C_OAR_REG, 0x08);
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dev_dbg(dev->dev, "input_clock = %d, CLK = %d\n", input_clock, clk);
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dev_dbg(dev->dev, "PSC = %d\n",
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davinci_i2c_read_reg(dev, DAVINCI_I2C_PSC_REG));
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dev_dbg(dev->dev, "CLKL = %d\n",
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davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG));
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dev_dbg(dev->dev, "CLKH = %d\n",
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davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG));
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dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n",
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pdata->bus_freq, pdata->bus_delay);
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/* Take the I2C module out of reset: */
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w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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MOD_REG_BIT(w, DAVINCI_I2C_MDR_IRS, 1);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
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/* Enable interrupts */
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davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, I2C_DAVINCI_INTR_ALL);
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return 0;
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}
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/*
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* Waiting for bus not busy
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*/
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static int i2c_davinci_wait_bus_not_busy(struct davinci_i2c_dev *dev,
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char allow_sleep)
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{
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unsigned long timeout;
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timeout = jiffies + dev->adapter.timeout;
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while (davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG)
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& DAVINCI_I2C_STR_BB) {
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if (time_after(jiffies, timeout)) {
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dev_warn(dev->dev,
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"timeout waiting for bus ready\n");
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return -ETIMEDOUT;
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}
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if (allow_sleep)
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schedule_timeout(1);
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}
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return 0;
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}
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/*
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* Low level master read/write transaction. This function is called
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* from i2c_davinci_xfer.
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*/
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static int
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i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
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{
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struct davinci_i2c_dev *dev = i2c_get_adapdata(adap);
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struct davinci_i2c_platform_data *pdata = dev->dev->platform_data;
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u32 flag;
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u16 w;
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int r;
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if (msg->len == 0)
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return -EINVAL;
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if (!pdata)
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pdata = &davinci_i2c_platform_data_default;
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/* Introduce a delay, required for some boards (e.g Davinci EVM) */
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if (pdata->bus_delay)
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udelay(pdata->bus_delay);
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/* set the slave address */
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davinci_i2c_write_reg(dev, DAVINCI_I2C_SAR_REG, msg->addr);
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dev->buf = msg->buf;
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dev->buf_len = msg->len;
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davinci_i2c_write_reg(dev, DAVINCI_I2C_CNT_REG, dev->buf_len);
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INIT_COMPLETION(dev->cmd_complete);
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dev->cmd_err = 0;
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/* Take I2C out of reset, configure it as master and set the
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* start bit */
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flag = DAVINCI_I2C_MDR_IRS | DAVINCI_I2C_MDR_MST | DAVINCI_I2C_MDR_STT;
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/* if the slave address is ten bit address, enable XA bit */
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if (msg->flags & I2C_M_TEN)
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flag |= DAVINCI_I2C_MDR_XA;
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if (!(msg->flags & I2C_M_RD))
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flag |= DAVINCI_I2C_MDR_TRX;
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if (stop)
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flag |= DAVINCI_I2C_MDR_STP;
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/* Enable receive or transmit interrupts */
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w = davinci_i2c_read_reg(dev, DAVINCI_I2C_IMR_REG);
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if (msg->flags & I2C_M_RD)
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MOD_REG_BIT(w, DAVINCI_I2C_IMR_RRDY, 1);
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else
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MOD_REG_BIT(w, DAVINCI_I2C_IMR_XRDY, 1);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, w);
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dev->terminate = 0;
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/* write the data into mode register */
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
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r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
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dev->adapter.timeout);
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if (r == 0) {
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dev_err(dev->dev, "controller timed out\n");
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i2c_davinci_init(dev);
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dev->buf_len = 0;
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return -ETIMEDOUT;
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}
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if (dev->buf_len) {
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/* This should be 0 if all bytes were transferred
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* or dev->cmd_err denotes an error.
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* A signal may have aborted the transfer.
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*/
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if (r >= 0) {
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dev_err(dev->dev, "abnormal termination buf_len=%i\n",
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dev->buf_len);
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r = -EREMOTEIO;
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}
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dev->terminate = 1;
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wmb();
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dev->buf_len = 0;
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}
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if (r < 0)
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return r;
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/* no error */
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if (likely(!dev->cmd_err))
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return msg->len;
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/* We have an error */
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if (dev->cmd_err & DAVINCI_I2C_STR_AL) {
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i2c_davinci_init(dev);
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return -EIO;
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}
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if (dev->cmd_err & DAVINCI_I2C_STR_NACK) {
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if (msg->flags & I2C_M_IGNORE_NAK)
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return msg->len;
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if (stop) {
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w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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MOD_REG_BIT(w, DAVINCI_I2C_MDR_STP, 1);
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
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}
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return -EREMOTEIO;
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}
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return -EIO;
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}
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/*
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* Prepare controller for a transaction and call i2c_davinci_xfer_msg
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*/
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static int
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i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
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{
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struct davinci_i2c_dev *dev = i2c_get_adapdata(adap);
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int i;
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int ret;
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dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
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ret = i2c_davinci_wait_bus_not_busy(dev, 1);
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if (ret < 0) {
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dev_warn(dev->dev, "timeout waiting for bus ready\n");
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return ret;
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}
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for (i = 0; i < num; i++) {
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ret = i2c_davinci_xfer_msg(adap, &msgs[i], (i == (num - 1)));
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dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num,
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ret);
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if (ret < 0)
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return ret;
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}
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return num;
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}
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static u32 i2c_davinci_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
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}
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static void terminate_read(struct davinci_i2c_dev *dev)
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{
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u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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w |= DAVINCI_I2C_MDR_NACK;
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
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/* Throw away data */
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davinci_i2c_read_reg(dev, DAVINCI_I2C_DRR_REG);
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if (!dev->terminate)
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dev_err(dev->dev, "RDR IRQ while no data requested\n");
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}
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static void terminate_write(struct davinci_i2c_dev *dev)
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{
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u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
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w |= DAVINCI_I2C_MDR_RM | DAVINCI_I2C_MDR_STP;
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davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w);
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if (!dev->terminate)
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dev_dbg(dev->dev, "TDR IRQ while no data to send\n");
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}
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/*
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* Interrupt service routine. This gets called whenever an I2C interrupt
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* occurs.
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*/
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static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
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{
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struct davinci_i2c_dev *dev = dev_id;
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u32 stat;
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int count = 0;
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u16 w;
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while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) {
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dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat);
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if (count++ == 100) {
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dev_warn(dev->dev, "Too much work in one IRQ\n");
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break;
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}
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switch (stat) {
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case DAVINCI_I2C_IVR_AL:
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/* Arbitration lost, must retry */
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dev->cmd_err |= DAVINCI_I2C_STR_AL;
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dev->buf_len = 0;
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complete(&dev->cmd_complete);
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break;
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case DAVINCI_I2C_IVR_NACK:
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dev->cmd_err |= DAVINCI_I2C_STR_NACK;
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dev->buf_len = 0;
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complete(&dev->cmd_complete);
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break;
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case DAVINCI_I2C_IVR_ARDY:
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davinci_i2c_write_reg(dev,
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DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_ARDY);
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|
complete(&dev->cmd_complete);
|
|
break;
|
|
|
|
case DAVINCI_I2C_IVR_RDR:
|
|
if (dev->buf_len) {
|
|
*dev->buf++ =
|
|
davinci_i2c_read_reg(dev,
|
|
DAVINCI_I2C_DRR_REG);
|
|
dev->buf_len--;
|
|
if (dev->buf_len)
|
|
continue;
|
|
|
|
davinci_i2c_write_reg(dev,
|
|
DAVINCI_I2C_STR_REG,
|
|
DAVINCI_I2C_IMR_RRDY);
|
|
} else {
|
|
/* signal can terminate transfer */
|
|
terminate_read(dev);
|
|
}
|
|
break;
|
|
|
|
case DAVINCI_I2C_IVR_XRDY:
|
|
if (dev->buf_len) {
|
|
davinci_i2c_write_reg(dev, DAVINCI_I2C_DXR_REG,
|
|
*dev->buf++);
|
|
dev->buf_len--;
|
|
if (dev->buf_len)
|
|
continue;
|
|
|
|
w = davinci_i2c_read_reg(dev,
|
|
DAVINCI_I2C_IMR_REG);
|
|
MOD_REG_BIT(w, DAVINCI_I2C_IMR_XRDY, 0);
|
|
davinci_i2c_write_reg(dev,
|
|
DAVINCI_I2C_IMR_REG,
|
|
w);
|
|
} else {
|
|
/* signal can terminate transfer */
|
|
terminate_write(dev);
|
|
}
|
|
break;
|
|
|
|
case DAVINCI_I2C_IVR_SCD:
|
|
davinci_i2c_write_reg(dev,
|
|
DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_SCD);
|
|
complete(&dev->cmd_complete);
|
|
break;
|
|
|
|
case DAVINCI_I2C_IVR_AAS:
|
|
dev_dbg(dev->dev, "Address as slave interrupt\n");
|
|
break;
|
|
|
|
default:
|
|
dev_warn(dev->dev, "Unrecognized irq stat %d\n", stat);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return count ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
|
|
static struct i2c_algorithm i2c_davinci_algo = {
|
|
.master_xfer = i2c_davinci_xfer,
|
|
.functionality = i2c_davinci_func,
|
|
};
|
|
|
|
static int davinci_i2c_probe(struct platform_device *pdev)
|
|
{
|
|
struct davinci_i2c_dev *dev;
|
|
struct i2c_adapter *adap;
|
|
struct resource *mem, *irq, *ioarea;
|
|
int r;
|
|
|
|
/* NOTE: driver uses the static register mapping */
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!mem) {
|
|
dev_err(&pdev->dev, "no mem resource?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!irq) {
|
|
dev_err(&pdev->dev, "no irq resource?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ioarea = request_mem_region(mem->start, resource_size(mem),
|
|
pdev->name);
|
|
if (!ioarea) {
|
|
dev_err(&pdev->dev, "I2C region already claimed\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
dev = kzalloc(sizeof(struct davinci_i2c_dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
r = -ENOMEM;
|
|
goto err_release_region;
|
|
}
|
|
|
|
init_completion(&dev->cmd_complete);
|
|
dev->dev = get_device(&pdev->dev);
|
|
dev->irq = irq->start;
|
|
platform_set_drvdata(pdev, dev);
|
|
|
|
dev->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(dev->clk)) {
|
|
r = -ENODEV;
|
|
goto err_free_mem;
|
|
}
|
|
clk_enable(dev->clk);
|
|
|
|
dev->base = (void __iomem *)IO_ADDRESS(mem->start);
|
|
i2c_davinci_init(dev);
|
|
|
|
r = request_irq(dev->irq, i2c_davinci_isr, 0, pdev->name, dev);
|
|
if (r) {
|
|
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
|
|
goto err_unuse_clocks;
|
|
}
|
|
|
|
adap = &dev->adapter;
|
|
i2c_set_adapdata(adap, dev);
|
|
adap->owner = THIS_MODULE;
|
|
adap->class = I2C_CLASS_HWMON;
|
|
strlcpy(adap->name, "DaVinci I2C adapter", sizeof(adap->name));
|
|
adap->algo = &i2c_davinci_algo;
|
|
adap->dev.parent = &pdev->dev;
|
|
adap->timeout = DAVINCI_I2C_TIMEOUT;
|
|
|
|
adap->nr = pdev->id;
|
|
r = i2c_add_numbered_adapter(adap);
|
|
if (r) {
|
|
dev_err(&pdev->dev, "failure adding adapter\n");
|
|
goto err_free_irq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(dev->irq, dev);
|
|
err_unuse_clocks:
|
|
clk_disable(dev->clk);
|
|
clk_put(dev->clk);
|
|
dev->clk = NULL;
|
|
err_free_mem:
|
|
platform_set_drvdata(pdev, NULL);
|
|
put_device(&pdev->dev);
|
|
kfree(dev);
|
|
err_release_region:
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
|
|
return r;
|
|
}
|
|
|
|
static int davinci_i2c_remove(struct platform_device *pdev)
|
|
{
|
|
struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
|
|
struct resource *mem;
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
i2c_del_adapter(&dev->adapter);
|
|
put_device(&pdev->dev);
|
|
|
|
clk_disable(dev->clk);
|
|
clk_put(dev->clk);
|
|
dev->clk = NULL;
|
|
|
|
davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
|
|
free_irq(IRQ_I2C, dev);
|
|
kfree(dev);
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
return 0;
|
|
}
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:i2c_davinci");
|
|
|
|
static struct platform_driver davinci_i2c_driver = {
|
|
.probe = davinci_i2c_probe,
|
|
.remove = davinci_i2c_remove,
|
|
.driver = {
|
|
.name = "i2c_davinci",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/* I2C may be needed to bring up other drivers */
|
|
static int __init davinci_i2c_init_driver(void)
|
|
{
|
|
return platform_driver_register(&davinci_i2c_driver);
|
|
}
|
|
subsys_initcall(davinci_i2c_init_driver);
|
|
|
|
static void __exit davinci_i2c_exit_driver(void)
|
|
{
|
|
platform_driver_unregister(&davinci_i2c_driver);
|
|
}
|
|
module_exit(davinci_i2c_exit_driver);
|
|
|
|
MODULE_AUTHOR("Texas Instruments India");
|
|
MODULE_DESCRIPTION("TI DaVinci I2C bus adapter");
|
|
MODULE_LICENSE("GPL");
|