+++ /dev/null
-/*
- * drivers/i2c/busses/i2c-s6000.c
- *
- * Description: Driver for S6000 Family I2C Interface
- * Copyright (c) 2008 emlix GmbH
- * Author: Oskar Schirmer <oskar@scara.com>
- *
- * Partially based on i2c-bfin-twi.c driver by <sonic.zhang@analog.com>
- * Copyright (c) 2005-2007 Analog Devices, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/i2c/s6000.h>
-#include <linux/timer.h>
-#include <linux/spinlock.h>
-#include <linux/completion.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-
-#include "i2c-s6000.h"
-
-#define DRV_NAME "i2c-s6000"
-
-#define POLL_TIMEOUT (2 * HZ)
-
-struct s6i2c_if {
- u8 __iomem *reg; /* memory mapped registers */
- int irq;
- spinlock_t lock;
- struct i2c_msg *msgs; /* messages currently handled */
- int msgs_num; /* nb of msgs to do */
- int msgs_push; /* nb of msgs read/written */
- int msgs_done; /* nb of msgs finally handled */
- unsigned push; /* nb of bytes read/written in msg */
- unsigned done; /* nb of bytes finally handled */
- int timeout_count; /* timeout retries left */
- struct timer_list timeout_timer;
- struct i2c_adapter adap;
- struct completion complete;
- struct clk *clk;
- struct resource *res;
-};
-
-static inline u16 i2c_rd16(struct s6i2c_if *iface, unsigned n)
-{
- return readw(iface->reg + (n));
-}
-
-static inline void i2c_wr16(struct s6i2c_if *iface, unsigned n, u16 v)
-{
- writew(v, iface->reg + (n));
-}
-
-static inline u32 i2c_rd32(struct s6i2c_if *iface, unsigned n)
-{
- return readl(iface->reg + (n));
-}
-
-static inline void i2c_wr32(struct s6i2c_if *iface, unsigned n, u32 v)
-{
- writel(v, iface->reg + (n));
-}
-
-static struct s6i2c_if s6i2c_if;
-
-static void s6i2c_handle_interrupt(struct s6i2c_if *iface)
-{
- if (i2c_rd16(iface, S6_I2C_INTRSTAT) & (1 << S6_I2C_INTR_TXABRT)) {
- i2c_rd16(iface, S6_I2C_CLRTXABRT);
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- complete(&iface->complete);
- return;
- }
- if (iface->msgs_done >= iface->msgs_num) {
- dev_err(&iface->adap.dev, "s6i2c: spurious I2C irq: %04x\n",
- i2c_rd16(iface, S6_I2C_INTRSTAT));
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- return;
- }
- while ((iface->msgs_push < iface->msgs_num)
- && (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_TFNF))) {
- struct i2c_msg *m = &iface->msgs[iface->msgs_push];
- if (!(m->flags & I2C_M_RD))
- i2c_wr16(iface, S6_I2C_DATACMD, m->buf[iface->push]);
- else
- i2c_wr16(iface, S6_I2C_DATACMD,
- 1 << S6_I2C_DATACMD_READ);
- if (++iface->push >= m->len) {
- iface->push = 0;
- iface->msgs_push += 1;
- }
- }
- do {
- struct i2c_msg *m = &iface->msgs[iface->msgs_done];
- if (!(m->flags & I2C_M_RD)) {
- if (iface->msgs_done < iface->msgs_push)
- iface->msgs_done += 1;
- else
- break;
- } else if (i2c_rd16(iface, S6_I2C_STATUS)
- & (1 << S6_I2C_STATUS_RFNE)) {
- m->buf[iface->done] = i2c_rd16(iface, S6_I2C_DATACMD);
- if (++iface->done >= m->len) {
- iface->done = 0;
- iface->msgs_done += 1;
- }
- } else{
- break;
- }
- } while (iface->msgs_done < iface->msgs_num);
- if (iface->msgs_done >= iface->msgs_num) {
- i2c_wr16(iface, S6_I2C_INTRMASK, 1 << S6_I2C_INTR_TXABRT);
- complete(&iface->complete);
- } else if (iface->msgs_push >= iface->msgs_num) {
- i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
- (1 << S6_I2C_INTR_RXFULL));
- } else {
- i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
- (1 << S6_I2C_INTR_TXEMPTY) |
- (1 << S6_I2C_INTR_RXFULL));
- }
-}
-
-static irqreturn_t s6i2c_interrupt_entry(int irq, void *dev_id)
-{
- struct s6i2c_if *iface = dev_id;
- if (!(i2c_rd16(iface, S6_I2C_STATUS) & ((1 << S6_I2C_INTR_RXUNDER)
- | (1 << S6_I2C_INTR_RXOVER)
- | (1 << S6_I2C_INTR_RXFULL)
- | (1 << S6_I2C_INTR_TXOVER)
- | (1 << S6_I2C_INTR_TXEMPTY)
- | (1 << S6_I2C_INTR_RDREQ)
- | (1 << S6_I2C_INTR_TXABRT)
- | (1 << S6_I2C_INTR_RXDONE)
- | (1 << S6_I2C_INTR_ACTIVITY)
- | (1 << S6_I2C_INTR_STOPDET)
- | (1 << S6_I2C_INTR_STARTDET)
- | (1 << S6_I2C_INTR_GENCALL))))
- return IRQ_NONE;
-
- spin_lock(&iface->lock);
- del_timer(&iface->timeout_timer);
- s6i2c_handle_interrupt(iface);
- spin_unlock(&iface->lock);
- return IRQ_HANDLED;
-}
-
-static void s6i2c_timeout(unsigned long data)
-{
- struct s6i2c_if *iface = (struct s6i2c_if *)data;
- unsigned long flags;
-
- spin_lock_irqsave(&iface->lock, flags);
- s6i2c_handle_interrupt(iface);
- if (--iface->timeout_count > 0) {
- iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
- add_timer(&iface->timeout_timer);
- } else {
- complete(&iface->complete);
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- }
- spin_unlock_irqrestore(&iface->lock, flags);
-}
-
-static int s6i2c_master_xfer(struct i2c_adapter *adap,
- struct i2c_msg *msgs, int num)
-{
- struct s6i2c_if *iface = adap->algo_data;
- int i;
- if (num == 0)
- return 0;
- if (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
- yield();
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- i2c_rd16(iface, S6_I2C_CLRINTR);
- for (i = 0; i < num; i++) {
- if (msgs[i].flags & I2C_M_TEN) {
- dev_err(&adap->dev,
- "s6i2c: 10 bits addr not supported\n");
- return -EINVAL;
- }
- if (msgs[i].len == 0) {
- dev_err(&adap->dev,
- "s6i2c: zero length message not supported\n");
- return -EINVAL;
- }
- if (msgs[i].addr != msgs[0].addr) {
- dev_err(&adap->dev,
- "s6i2c: multiple xfer cannot change target\n");
- return -EINVAL;
- }
- }
-
- iface->msgs = msgs;
- iface->msgs_num = num;
- iface->msgs_push = 0;
- iface->msgs_done = 0;
- iface->push = 0;
- iface->done = 0;
- iface->timeout_count = 10;
- i2c_wr16(iface, S6_I2C_TAR, msgs[0].addr);
- i2c_wr16(iface, S6_I2C_ENABLE, 1);
- i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXEMPTY) |
- (1 << S6_I2C_INTR_TXABRT));
-
- iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
- add_timer(&iface->timeout_timer);
- wait_for_completion(&iface->complete);
- del_timer_sync(&iface->timeout_timer);
- while (i2c_rd32(iface, S6_I2C_TXFLR) > 0)
- schedule();
- while (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
- schedule();
-
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- i2c_wr16(iface, S6_I2C_ENABLE, 0);
- return iface->msgs_done;
-}
-
-static u32 s6i2c_functionality(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static struct i2c_algorithm s6i2c_algorithm = {
- .master_xfer = s6i2c_master_xfer,
- .functionality = s6i2c_functionality,
-};
-
-static u16 nanoseconds_on_clk(struct s6i2c_if *iface, u32 ns)
-{
- u32 dividend = ((clk_get_rate(iface->clk) / 1000) * ns) / 1000000;
- if (dividend > 0xffff)
- return 0xffff;
- return dividend;
-}
-
-static int s6i2c_probe(struct platform_device *dev)
-{
- struct s6i2c_if *iface = &s6i2c_if;
- struct i2c_adapter *p_adap;
- const char *clock;
- int bus_num, rc;
- spin_lock_init(&iface->lock);
- init_completion(&iface->complete);
- iface->irq = platform_get_irq(dev, 0);
- if (iface->irq < 0) {
- rc = iface->irq;
- goto err_out;
- }
- iface->res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (!iface->res) {
- rc = -ENXIO;
- goto err_out;
- }
- iface->res = request_mem_region(iface->res->start,
- resource_size(iface->res),
- dev->dev.bus_id);
- if (!iface->res) {
- rc = -EBUSY;
- goto err_out;
- }
- iface->reg = ioremap_nocache(iface->res->start,
- resource_size(iface->res));
- if (!iface->reg) {
- rc = -ENOMEM;
- goto err_reg;
- }
-
- clock = 0;
- bus_num = -1;
- if (dev_get_platdata(&dev->dev)) {
- struct s6_i2c_platform_data *pdata =
- dev_get_platdata(&dev->dev);
- bus_num = pdata->bus_num;
- clock = pdata->clock;
- }
- iface->clk = clk_get(&dev->dev, clock);
- if (IS_ERR(iface->clk)) {
- rc = PTR_ERR(iface->clk);
- goto err_map;
- }
- rc = clk_enable(iface->clk);
- if (rc < 0)
- goto err_clk_put;
- init_timer(&iface->timeout_timer);
- iface->timeout_timer.function = s6i2c_timeout;
- iface->timeout_timer.data = (unsigned long)iface;
-
- p_adap = &iface->adap;
- strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
- p_adap->algo = &s6i2c_algorithm;
- p_adap->algo_data = iface;
- p_adap->nr = bus_num;
- p_adap->class = 0;
- p_adap->dev.parent = &dev->dev;
- i2c_wr16(iface, S6_I2C_INTRMASK, 0);
- rc = request_irq(iface->irq, s6i2c_interrupt_entry,
- IRQF_SHARED, dev->name, iface);
- if (rc) {
- dev_err(&p_adap->dev, "s6i2c: can't get IRQ %d\n", iface->irq);
- goto err_clk_dis;
- }
-
- i2c_wr16(iface, S6_I2C_ENABLE, 0);
- udelay(1);
- i2c_wr32(iface, S6_I2C_SRESET, 1 << S6_I2C_SRESET_IC_SRST);
- i2c_wr16(iface, S6_I2C_CLRTXABRT, 1);
- i2c_wr16(iface, S6_I2C_CON,
- (1 << S6_I2C_CON_MASTER) |
- (S6_I2C_CON_SPEED_NORMAL << S6_I2C_CON_SPEED) |
- (0 << S6_I2C_CON_10BITSLAVE) |
- (0 << S6_I2C_CON_10BITMASTER) |
- (1 << S6_I2C_CON_RESTARTENA) |
- (1 << S6_I2C_CON_SLAVEDISABLE));
- i2c_wr16(iface, S6_I2C_SSHCNT, nanoseconds_on_clk(iface, 4000));
- i2c_wr16(iface, S6_I2C_SSLCNT, nanoseconds_on_clk(iface, 4700));
- i2c_wr16(iface, S6_I2C_FSHCNT, nanoseconds_on_clk(iface, 600));
- i2c_wr16(iface, S6_I2C_FSLCNT, nanoseconds_on_clk(iface, 1300));
- i2c_wr16(iface, S6_I2C_RXTL, 0);
- i2c_wr16(iface, S6_I2C_TXTL, 0);
-
- platform_set_drvdata(dev, iface);
- rc = i2c_add_numbered_adapter(p_adap);
- if (rc)
- goto err_irq_free;
- return 0;
-
-err_irq_free:
- free_irq(iface->irq, iface);
-err_clk_dis:
- clk_disable(iface->clk);
-err_clk_put:
- clk_put(iface->clk);
-err_map:
- iounmap(iface->reg);
-err_reg:
- release_mem_region(iface->res->start,
- resource_size(iface->res));
-err_out:
- return rc;
-}
-
-static int s6i2c_remove(struct platform_device *pdev)
-{
- struct s6i2c_if *iface = platform_get_drvdata(pdev);
- i2c_wr16(iface, S6_I2C_ENABLE, 0);
- i2c_del_adapter(&iface->adap);
- free_irq(iface->irq, iface);
- clk_disable(iface->clk);
- clk_put(iface->clk);
- iounmap(iface->reg);
- release_mem_region(iface->res->start,
- resource_size(iface->res));
- return 0;
-}
-
-static struct platform_driver s6i2c_driver = {
- .probe = s6i2c_probe,
- .remove = s6i2c_remove,
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static int __init s6i2c_init(void)
-{
- pr_info("I2C: S6000 I2C driver\n");
- return platform_driver_register(&s6i2c_driver);
-}
-
-static void __exit s6i2c_exit(void)
-{
- platform_driver_unregister(&s6i2c_driver);
-}
-
-MODULE_DESCRIPTION("I2C-Bus adapter routines for S6000 I2C");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRV_NAME);
-
-subsys_initcall(s6i2c_init);
-module_exit(s6i2c_exit);
+++ /dev/null
-/*
- * drivers/i2c/busses/i2c-s6000.h
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2008 Emlix GmbH <info@emlix.com>
- * Author: Oskar Schirmer <oskar@scara.com>
- */
-
-#ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H
-#define __DRIVERS_I2C_BUSSES_I2C_S6000_H
-
-#define S6_I2C_CON 0x000
-#define S6_I2C_CON_MASTER 0
-#define S6_I2C_CON_SPEED 1
-#define S6_I2C_CON_SPEED_NORMAL 1
-#define S6_I2C_CON_SPEED_FAST 2
-#define S6_I2C_CON_SPEED_MASK 3
-#define S6_I2C_CON_10BITSLAVE 3
-#define S6_I2C_CON_10BITMASTER 4
-#define S6_I2C_CON_RESTARTENA 5
-#define S6_I2C_CON_SLAVEDISABLE 6
-#define S6_I2C_TAR 0x004
-#define S6_I2C_TAR_GCORSTART 10
-#define S6_I2C_TAR_SPECIAL 11
-#define S6_I2C_SAR 0x008
-#define S6_I2C_HSMADDR 0x00C
-#define S6_I2C_DATACMD 0x010
-#define S6_I2C_DATACMD_READ 8
-#define S6_I2C_SSHCNT 0x014
-#define S6_I2C_SSLCNT 0x018
-#define S6_I2C_FSHCNT 0x01C
-#define S6_I2C_FSLCNT 0x020
-#define S6_I2C_INTRSTAT 0x02C
-#define S6_I2C_INTRMASK 0x030
-#define S6_I2C_RAWINTR 0x034
-#define S6_I2C_INTR_RXUNDER 0
-#define S6_I2C_INTR_RXOVER 1
-#define S6_I2C_INTR_RXFULL 2
-#define S6_I2C_INTR_TXOVER 3
-#define S6_I2C_INTR_TXEMPTY 4
-#define S6_I2C_INTR_RDREQ 5
-#define S6_I2C_INTR_TXABRT 6
-#define S6_I2C_INTR_RXDONE 7
-#define S6_I2C_INTR_ACTIVITY 8
-#define S6_I2C_INTR_STOPDET 9
-#define S6_I2C_INTR_STARTDET 10
-#define S6_I2C_INTR_GENCALL 11
-#define S6_I2C_RXTL 0x038
-#define S6_I2C_TXTL 0x03C
-#define S6_I2C_CLRINTR 0x040
-#define S6_I2C_CLRRXUNDER 0x044
-#define S6_I2C_CLRRXOVER 0x048
-#define S6_I2C_CLRTXOVER 0x04C
-#define S6_I2C_CLRRDREQ 0x050
-#define S6_I2C_CLRTXABRT 0x054
-#define S6_I2C_CLRRXDONE 0x058
-#define S6_I2C_CLRACTIVITY 0x05C
-#define S6_I2C_CLRSTOPDET 0x060
-#define S6_I2C_CLRSTARTDET 0x064
-#define S6_I2C_CLRGENCALL 0x068
-#define S6_I2C_ENABLE 0x06C
-#define S6_I2C_STATUS 0x070
-#define S6_I2C_STATUS_ACTIVITY 0
-#define S6_I2C_STATUS_TFNF 1
-#define S6_I2C_STATUS_TFE 2
-#define S6_I2C_STATUS_RFNE 3
-#define S6_I2C_STATUS_RFF 4
-#define S6_I2C_TXFLR 0x074
-#define S6_I2C_RXFLR 0x078
-#define S6_I2C_SRESET 0x07C
-#define S6_I2C_SRESET_IC_SRST 0
-#define S6_I2C_SRESET_IC_MASTER_SRST 1
-#define S6_I2C_SRESET_IC_SLAVE_SRST 2
-#define S6_I2C_TXABRTSOURCE 0x080
-
-#endif
git.openpandora.org / pandora-kernel.git / commitdiff