660 lines
16 KiB
C
660 lines
16 KiB
C
/*
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* (C) Copyright 2003-2004
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* Humboldt Solutions Ltd, adrian@humboldt.co.uk.
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* This is a combined i2c adapter and algorithm driver for the
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* MPC107/Tsi107 PowerPC northbridge and processors that include
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* the same I2C unit (8240, 8245, 85xx).
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*
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* Release 0.8
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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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/sched.h>
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#include <linux/init.h>
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#include <linux/of_platform.h>
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#include <linux/of_i2c.h>
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#include <linux/io.h>
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#include <linux/fsl_devices.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <asm/mpc52xx.h>
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#include <sysdev/fsl_soc.h>
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#define DRV_NAME "mpc-i2c"
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#define MPC_I2C_FDR 0x04
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#define MPC_I2C_CR 0x08
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#define MPC_I2C_SR 0x0c
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#define MPC_I2C_DR 0x10
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#define MPC_I2C_DFSRR 0x14
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#define CCR_MEN 0x80
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#define CCR_MIEN 0x40
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#define CCR_MSTA 0x20
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#define CCR_MTX 0x10
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#define CCR_TXAK 0x08
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#define CCR_RSTA 0x04
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#define CSR_MCF 0x80
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#define CSR_MAAS 0x40
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#define CSR_MBB 0x20
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#define CSR_MAL 0x10
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#define CSR_SRW 0x04
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#define CSR_MIF 0x02
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#define CSR_RXAK 0x01
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struct mpc_i2c {
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struct device *dev;
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void __iomem *base;
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u32 interrupt;
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wait_queue_head_t queue;
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struct i2c_adapter adap;
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int irq;
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};
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struct mpc_i2c_divider {
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u16 divider;
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u16 fdr; /* including dfsrr */
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};
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struct mpc_i2c_match_data {
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void (*setclock)(struct device_node *node,
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struct mpc_i2c *i2c,
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u32 clock, u32 prescaler);
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u32 prescaler;
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};
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static inline void writeccr(struct mpc_i2c *i2c, u32 x)
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{
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writeb(x, i2c->base + MPC_I2C_CR);
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}
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static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
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{
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struct mpc_i2c *i2c = dev_id;
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if (readb(i2c->base + MPC_I2C_SR) & CSR_MIF) {
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/* Read again to allow register to stabilise */
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i2c->interrupt = readb(i2c->base + MPC_I2C_SR);
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writeb(0, i2c->base + MPC_I2C_SR);
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wake_up(&i2c->queue);
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}
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return IRQ_HANDLED;
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}
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/* Sometimes 9th clock pulse isn't generated, and slave doesn't release
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* the bus, because it wants to send ACK.
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* Following sequence of enabling/disabling and sending start/stop generates
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* the pulse, so it's all OK.
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*/
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static void mpc_i2c_fixup(struct mpc_i2c *i2c)
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{
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writeccr(i2c, 0);
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udelay(30);
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writeccr(i2c, CCR_MEN);
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udelay(30);
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writeccr(i2c, CCR_MSTA | CCR_MTX);
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udelay(30);
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writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN);
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udelay(30);
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writeccr(i2c, CCR_MEN);
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udelay(30);
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}
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static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
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{
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unsigned long orig_jiffies = jiffies;
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u32 x;
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int result = 0;
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if (i2c->irq == NO_IRQ) {
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while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
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schedule();
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if (time_after(jiffies, orig_jiffies + timeout)) {
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dev_dbg(i2c->dev, "timeout\n");
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writeccr(i2c, 0);
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result = -EIO;
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break;
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}
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}
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x = readb(i2c->base + MPC_I2C_SR);
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writeb(0, i2c->base + MPC_I2C_SR);
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} else {
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/* Interrupt mode */
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result = wait_event_timeout(i2c->queue,
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(i2c->interrupt & CSR_MIF), timeout);
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if (unlikely(!(i2c->interrupt & CSR_MIF))) {
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dev_dbg(i2c->dev, "wait timeout\n");
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writeccr(i2c, 0);
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result = -ETIMEDOUT;
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}
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x = i2c->interrupt;
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i2c->interrupt = 0;
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}
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if (result < 0)
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return result;
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if (!(x & CSR_MCF)) {
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dev_dbg(i2c->dev, "unfinished\n");
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return -EIO;
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}
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if (x & CSR_MAL) {
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dev_dbg(i2c->dev, "MAL\n");
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return -EIO;
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}
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if (writing && (x & CSR_RXAK)) {
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dev_dbg(i2c->dev, "No RXAK\n");
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/* generate stop */
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writeccr(i2c, CCR_MEN);
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return -EIO;
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}
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return 0;
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}
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#ifdef CONFIG_PPC_MPC52xx
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static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
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{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
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{28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
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{36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
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{52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
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{68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
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{96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
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{128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
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{176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
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{240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
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{320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
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{448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
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{640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
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{1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
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{1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
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{2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
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{4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
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{7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
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{10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
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};
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int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
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{
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const struct mpc_i2c_divider *div = NULL;
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unsigned int pvr = mfspr(SPRN_PVR);
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u32 divider;
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int i;
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if (!clock)
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return -EINVAL;
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/* Determine divider value */
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divider = mpc5xxx_get_bus_frequency(node) / clock;
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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.
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*/
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for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_52xx); i++) {
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div = &mpc_i2c_dividers_52xx[i];
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/* Old MPC5200 rev A CPUs do not support the high bits */
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if (div->fdr & 0xc0 && pvr == 0x80822011)
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continue;
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if (div->divider >= divider)
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break;
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}
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return div ? (int)div->fdr : -EINVAL;
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}
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static void mpc_i2c_setclock_52xx(struct device_node *node,
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struct mpc_i2c *i2c,
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u32 clock, u32 prescaler)
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{
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int ret, fdr;
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ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
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fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
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writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
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if (ret >= 0)
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dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
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}
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#else /* !CONFIG_PPC_MPC52xx */
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static void mpc_i2c_setclock_52xx(struct device_node *node,
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struct mpc_i2c *i2c,
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u32 clock, u32 prescaler)
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{
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}
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#endif /* CONFIG_PPC_MPC52xx*/
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#ifdef CONFIG_FSL_SOC
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static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
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{160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
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{288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
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{416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
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{544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
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{672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
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{800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
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{1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
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{1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
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{1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
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{2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
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{3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
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{4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
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{7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
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{12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
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{18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
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{30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
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{49152, 0x011e}, {61440, 0x011f}
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};
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u32 mpc_i2c_get_sec_cfg_8xxx(void)
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{
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struct device_node *node = NULL;
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u32 __iomem *reg;
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u32 val = 0;
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node = of_find_node_by_name(NULL, "global-utilities");
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if (node) {
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const u32 *prop = of_get_property(node, "reg", NULL);
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if (prop) {
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/*
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* Map and check POR Device Status Register 2
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* (PORDEVSR2) at 0xE0014
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*/
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reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
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if (!reg)
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printk(KERN_ERR
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"Error: couldn't map PORDEVSR2\n");
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else
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val = in_be32(reg) & 0x00000080; /* sec-cfg */
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iounmap(reg);
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}
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}
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if (node)
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of_node_put(node);
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return val;
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}
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int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
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{
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const struct mpc_i2c_divider *div = NULL;
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u32 divider;
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int i;
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if (!clock)
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return -EINVAL;
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/* Determine proper divider value */
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if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
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prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
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if (!prescaler)
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prescaler = 1;
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divider = fsl_get_sys_freq() / clock / prescaler;
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pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
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fsl_get_sys_freq(), clock, divider);
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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.
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*/
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for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_8xxx); i++) {
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div = &mpc_i2c_dividers_8xxx[i];
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if (div->divider >= divider)
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break;
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}
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return div ? (int)div->fdr : -EINVAL;
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}
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static void mpc_i2c_setclock_8xxx(struct device_node *node,
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struct mpc_i2c *i2c,
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u32 clock, u32 prescaler)
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{
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int ret, fdr;
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ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
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fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
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writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
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writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
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if (ret >= 0)
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dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
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clock, fdr >> 8, fdr & 0xff);
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}
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#else /* !CONFIG_FSL_SOC */
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static void mpc_i2c_setclock_8xxx(struct device_node *node,
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struct mpc_i2c *i2c,
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u32 clock, u32 prescaler)
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{
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}
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#endif /* CONFIG_FSL_SOC */
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static void mpc_i2c_start(struct mpc_i2c *i2c)
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{
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/* Clear arbitration */
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writeb(0, i2c->base + MPC_I2C_SR);
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/* Start with MEN */
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writeccr(i2c, CCR_MEN);
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}
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static void mpc_i2c_stop(struct mpc_i2c *i2c)
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{
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writeccr(i2c, CCR_MEN);
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}
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static int mpc_write(struct mpc_i2c *i2c, int target,
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const u8 *data, int length, int restart)
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{
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int i, result;
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unsigned timeout = i2c->adap.timeout;
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u32 flags = restart ? CCR_RSTA : 0;
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/* Start as master */
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
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/* Write target byte */
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writeb((target << 1), i2c->base + MPC_I2C_DR);
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result = i2c_wait(i2c, timeout, 1);
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if (result < 0)
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return result;
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for (i = 0; i < length; i++) {
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/* Write data byte */
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writeb(data[i], i2c->base + MPC_I2C_DR);
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result = i2c_wait(i2c, timeout, 1);
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if (result < 0)
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return result;
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}
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return 0;
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}
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static int mpc_read(struct mpc_i2c *i2c, int target,
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u8 *data, int length, int restart)
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{
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unsigned timeout = i2c->adap.timeout;
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int i, result;
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u32 flags = restart ? CCR_RSTA : 0;
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/* Switch to read - restart */
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
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/* Write target address byte - this time with the read flag set */
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writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);
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result = i2c_wait(i2c, timeout, 1);
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if (result < 0)
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return result;
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if (length) {
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if (length == 1)
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
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else
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA);
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/* Dummy read */
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readb(i2c->base + MPC_I2C_DR);
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}
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for (i = 0; i < length; i++) {
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result = i2c_wait(i2c, timeout, 0);
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if (result < 0)
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return result;
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/* Generate txack on next to last byte */
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if (i == length - 2)
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
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/* Do not generate stop on last byte */
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if (i == length - 1)
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writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX);
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data[i] = readb(i2c->base + MPC_I2C_DR);
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}
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return length;
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}
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static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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{
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struct i2c_msg *pmsg;
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int i;
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int ret = 0;
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unsigned long orig_jiffies = jiffies;
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struct mpc_i2c *i2c = i2c_get_adapdata(adap);
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mpc_i2c_start(i2c);
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/* Allow bus up to 1s to become not busy */
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while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
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if (signal_pending(current)) {
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dev_dbg(i2c->dev, "Interrupted\n");
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writeccr(i2c, 0);
|
|
return -EINTR;
|
|
}
|
|
if (time_after(jiffies, orig_jiffies + HZ)) {
|
|
dev_dbg(i2c->dev, "timeout\n");
|
|
if (readb(i2c->base + MPC_I2C_SR) ==
|
|
(CSR_MCF | CSR_MBB | CSR_RXAK))
|
|
mpc_i2c_fixup(i2c);
|
|
return -EIO;
|
|
}
|
|
schedule();
|
|
}
|
|
|
|
for (i = 0; ret >= 0 && i < num; i++) {
|
|
pmsg = &msgs[i];
|
|
dev_dbg(i2c->dev,
|
|
"Doing %s %d bytes to 0x%02x - %d of %d messages\n",
|
|
pmsg->flags & I2C_M_RD ? "read" : "write",
|
|
pmsg->len, pmsg->addr, i + 1, num);
|
|
if (pmsg->flags & I2C_M_RD)
|
|
ret =
|
|
mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
|
|
else
|
|
ret =
|
|
mpc_write(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
|
|
}
|
|
mpc_i2c_stop(i2c);
|
|
return (ret < 0) ? ret : num;
|
|
}
|
|
|
|
static u32 mpc_functionality(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|
|
static const struct i2c_algorithm mpc_algo = {
|
|
.master_xfer = mpc_xfer,
|
|
.functionality = mpc_functionality,
|
|
};
|
|
|
|
static struct i2c_adapter mpc_ops = {
|
|
.owner = THIS_MODULE,
|
|
.name = "MPC adapter",
|
|
.algo = &mpc_algo,
|
|
.timeout = HZ,
|
|
};
|
|
|
|
static int __devinit fsl_i2c_probe(struct of_device *op,
|
|
const struct of_device_id *match)
|
|
{
|
|
struct mpc_i2c *i2c;
|
|
const u32 *prop;
|
|
u32 clock = 0;
|
|
int result = 0;
|
|
int plen;
|
|
|
|
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
|
|
if (!i2c)
|
|
return -ENOMEM;
|
|
|
|
i2c->dev = &op->dev; /* for debug and error output */
|
|
|
|
init_waitqueue_head(&i2c->queue);
|
|
|
|
i2c->base = of_iomap(op->node, 0);
|
|
if (!i2c->base) {
|
|
dev_err(i2c->dev, "failed to map controller\n");
|
|
result = -ENOMEM;
|
|
goto fail_map;
|
|
}
|
|
|
|
i2c->irq = irq_of_parse_and_map(op->node, 0);
|
|
if (i2c->irq != NO_IRQ) { /* i2c->irq = NO_IRQ implies polling */
|
|
result = request_irq(i2c->irq, mpc_i2c_isr,
|
|
IRQF_SHARED, "i2c-mpc", i2c);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to attach interrupt\n");
|
|
goto fail_request;
|
|
}
|
|
}
|
|
|
|
if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
|
|
prop = of_get_property(op->node, "clock-frequency", &plen);
|
|
if (prop && plen == sizeof(u32))
|
|
clock = *prop;
|
|
|
|
if (match->data) {
|
|
struct mpc_i2c_match_data *data =
|
|
(struct mpc_i2c_match_data *)match->data;
|
|
data->setclock(op->node, i2c, clock, data->prescaler);
|
|
} else {
|
|
/* Backwards compatibility */
|
|
if (of_get_property(op->node, "dfsrr", NULL))
|
|
mpc_i2c_setclock_8xxx(op->node, i2c,
|
|
clock, 0);
|
|
}
|
|
}
|
|
|
|
dev_set_drvdata(&op->dev, i2c);
|
|
|
|
i2c->adap = mpc_ops;
|
|
i2c_set_adapdata(&i2c->adap, i2c);
|
|
i2c->adap.dev.parent = &op->dev;
|
|
|
|
result = i2c_add_adapter(&i2c->adap);
|
|
if (result < 0) {
|
|
dev_err(i2c->dev, "failed to add adapter\n");
|
|
goto fail_add;
|
|
}
|
|
of_register_i2c_devices(&i2c->adap, op->node);
|
|
|
|
return result;
|
|
|
|
fail_add:
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
free_irq(i2c->irq, i2c);
|
|
fail_request:
|
|
irq_dispose_mapping(i2c->irq);
|
|
iounmap(i2c->base);
|
|
fail_map:
|
|
kfree(i2c);
|
|
return result;
|
|
};
|
|
|
|
static int __devexit fsl_i2c_remove(struct of_device *op)
|
|
{
|
|
struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
|
|
|
|
i2c_del_adapter(&i2c->adap);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
if (i2c->irq != NO_IRQ)
|
|
free_irq(i2c->irq, i2c);
|
|
|
|
irq_dispose_mapping(i2c->irq);
|
|
iounmap(i2c->base);
|
|
kfree(i2c);
|
|
return 0;
|
|
};
|
|
|
|
static const struct of_device_id mpc_i2c_of_match[] = {
|
|
{.compatible = "mpc5200-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_52xx,
|
|
},
|
|
},
|
|
{.compatible = "fsl,mpc5200b-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_52xx,
|
|
},
|
|
},
|
|
{.compatible = "fsl,mpc5200-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_52xx,
|
|
},
|
|
},
|
|
{.compatible = "fsl,mpc8313-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_8xxx,
|
|
},
|
|
},
|
|
{.compatible = "fsl,mpc8543-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_8xxx,
|
|
.prescaler = 2,
|
|
},
|
|
},
|
|
{.compatible = "fsl,mpc8544-i2c",
|
|
.data = &(struct mpc_i2c_match_data) {
|
|
.setclock = mpc_i2c_setclock_8xxx,
|
|
.prescaler = 3,
|
|
},
|
|
/* Backward compatibility */
|
|
},
|
|
{.compatible = "fsl-i2c", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
|
|
|
|
|
|
/* Structure for a device driver */
|
|
static struct of_platform_driver mpc_i2c_driver = {
|
|
.match_table = mpc_i2c_of_match,
|
|
.probe = fsl_i2c_probe,
|
|
.remove = __devexit_p(fsl_i2c_remove),
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = DRV_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init fsl_i2c_init(void)
|
|
{
|
|
int rv;
|
|
|
|
rv = of_register_platform_driver(&mpc_i2c_driver);
|
|
if (rv)
|
|
printk(KERN_ERR DRV_NAME
|
|
" of_register_platform_driver failed (%i)\n", rv);
|
|
return rv;
|
|
}
|
|
|
|
static void __exit fsl_i2c_exit(void)
|
|
{
|
|
of_unregister_platform_driver(&mpc_i2c_driver);
|
|
}
|
|
|
|
module_init(fsl_i2c_init);
|
|
module_exit(fsl_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
|
|
MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
|
|
"MPC824x/85xx/52xx processors");
|
|
MODULE_LICENSE("GPL");
|