From b7af349b175af45f9d87b3bf3f0a221e1831ed39 Mon Sep 17 00:00:00 2001 From: Jarkko Nikula Date: Fri, 21 Nov 2008 13:39:45 -0800 Subject: i2c-omap: Do not use interruptible wait call in omap_i2c_xfer_msg If there is a signal pending and wait_for_completion_interruptible_timeout terminates with -ERESTARTSYS, we return and disable the i2c clocks in omap_i2c_xfer. If we terminate before sending last i2c message with a stop condition, the bus remains busy and we are not able to send new messages into bus with successive omap_i2c_xfer calls. Therefore a pending signal is not caught here and we return only because of timeout or i2c error. Signed-off-by: Jarkko Nikula Signed-off-by: Juha Yrjola Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 608038d64f81..17476ecd9782 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -328,8 +328,12 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, w |= OMAP_I2C_CON_STP; omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); - r = wait_for_completion_interruptible_timeout(&dev->cmd_complete, - OMAP_I2C_TIMEOUT); + /* + * REVISIT: We should abort the transfer on signals, but the bus goes + * into arbitration and we're currently unable to recover from it. + */ + r = wait_for_completion_timeout(&dev->cmd_complete, + OMAP_I2C_TIMEOUT); dev->buf_len = 0; if (r < 0) return r; -- cgit v1.2.3-58-ga151 From 0cbbcffdf5f30ef60d918549014684eada4f5b3f Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:45 -0800 Subject: i2c-omap: Close suspected race between omap_i2c_idle() and omap_i2c_isr() omap_i2c_idle() sets an internal flag, "dev->idle", instructing its ISR to decline interrupts. It sets this flag before it actually masks the interrupts on the I2C controller. This is problematic, since an I2C interrupt could arrive after dev->idle is set, but before the interrupt source is masked. When this happens, Linux disables the I2C controller's IRQ, causing all future transactions on the bus to fail. Symptoms, happening on about 7% of boots: irq 56: nobody cared (try booting with the "irqpoll" option) Disabling IRQ #56 i2c_omap i2c_omap.1: controller timed out In omap_i2c_idle(), this patch sets dev->idle only after the interrupt mask write to the I2C controller has left the ARM write buffer. That's probably the major offender. For additional prophylaxis, in omap_i2c_unidle(), the patch clears the dev->idle flag before interrupts are enabled, rather than afterwards. The patch has survived twenty-two reboots on the 3430SDP here without wedging I2C1. Not absolutely dispositive, but promising! Signed-off-by: Paul Walmsley Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 17476ecd9782..5ca0e0010a0e 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -181,22 +181,26 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev) if (dev->iclk != NULL) clk_enable(dev->iclk); clk_enable(dev->fclk); + dev->idle = 0; if (dev->iestate) omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); - dev->idle = 0; } static void omap_i2c_idle(struct omap_i2c_dev *dev) { u16 iv; - dev->idle = 1; dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); - if (dev->rev1) + if (dev->rev1) { iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ - else + } else { omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate); + + /* Flush posted write before the dev->idle store occurs */ + omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); + } + dev->idle = 1; clk_disable(dev->fclk); if (dev->iclk != NULL) clk_disable(dev->iclk); -- cgit v1.2.3-58-ga151 From 4574eb6892a13bc91aac8676457d46798935d653 Mon Sep 17 00:00:00 2001 From: Syed Mohammed Khasim Date: Fri, 21 Nov 2008 13:39:45 -0800 Subject: i2c-omap: Add high-speed support to omap-i2c Omap2430 has additional support for high-speed I2C. This patch moves I2C speed parameter (from module) to platform data. Also added basic High Speed support based on I2C bus speed. This patch is tested for high speed I2C (with TWL4030 Keypad) and works as expected. Also change the 2430 i2chs_fck names to use the standard naming. Cc: Russell King Signed-off-by: Syed Mohammed Khasim Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/clock24xx.h | 4 +- drivers/i2c/busses/i2c-omap.c | 82 ++++++++++++++++++++++++++++++----------- 2 files changed, 62 insertions(+), 24 deletions(-) (limited to 'drivers/i2c') diff --git a/arch/arm/mach-omap2/clock24xx.h b/arch/arm/mach-omap2/clock24xx.h index 242a19d86ccd..e5fc5bf5ceeb 100644 --- a/arch/arm/mach-omap2/clock24xx.h +++ b/arch/arm/mach-omap2/clock24xx.h @@ -2321,7 +2321,7 @@ static struct clk i2c2_fck = { }; static struct clk i2chs2_fck = { - .name = "i2chs_fck", + .name = "i2c_fck", .id = 2, .parent = &func_96m_ck, .flags = CLOCK_IN_OMAP243X, @@ -2354,7 +2354,7 @@ static struct clk i2c1_fck = { }; static struct clk i2chs1_fck = { - .name = "i2chs_fck", + .name = "i2c_fck", .id = 1, .parent = &func_96m_ck, .flags = CLOCK_IN_OMAP243X, diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 5ca0e0010a0e..b0aa0f8b564b 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -83,6 +83,7 @@ /* I2C Configuration Register (OMAP_I2C_CON): */ #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ +#define OMAP_I2C_CON_OPMODE (1 << 12) /* High Speed support */ #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ @@ -91,6 +92,10 @@ #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */ #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */ +/* I2C SCL time value when Master */ +#define OMAP_I2C_SCLL_HSSCLL 8 +#define OMAP_I2C_SCLH_HSSCLH 8 + /* I2C System Test Register (OMAP_I2C_SYSTEST): */ #ifdef DEBUG #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */ @@ -109,12 +114,6 @@ /* I2C System Configuration Register (OMAP_I2C_SYSC): */ #define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */ -/* REVISIT: Use platform_data instead of module parameters */ -/* Fast Mode = 400 kHz, Standard = 100 kHz */ -static int clock = 100; /* Default: 100 kHz */ -module_param(clock, int, 0); -MODULE_PARM_DESC(clock, "Set I2C clock in kHz: 400=fast mode (default == 100)"); - struct omap_i2c_dev { struct device *dev; void __iomem *base; /* virtual */ @@ -123,6 +122,7 @@ struct omap_i2c_dev { struct clk *fclk; /* Functional clock */ struct completion cmd_complete; struct resource *ioarea; + u32 speed; /* Speed of bus in Khz */ u16 cmd_err; u8 *buf; size_t buf_len; @@ -208,9 +208,11 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) static int omap_i2c_init(struct omap_i2c_dev *dev) { - u16 psc = 0; + u16 psc = 0, scll = 0, sclh = 0; + u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; unsigned long fclk_rate = 12000000; unsigned long timeout; + unsigned long internal_clk = 0; if (!dev->rev1) { omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST); @@ -253,18 +255,47 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) psc = fclk_rate / 12000000; } + if (cpu_is_omap2430()) { + + /* HSI2C controller internal clk rate should be 19.2 Mhz */ + internal_clk = 19200; + fclk_rate = clk_get_rate(dev->fclk) / 1000; + + /* Compute prescaler divisor */ + psc = fclk_rate / internal_clk; + psc = psc - 1; + + /* If configured for High Speed */ + if (dev->speed > 400) { + /* For first phase of HS mode */ + fsscll = internal_clk / (400 * 2) - 6; + fssclh = internal_clk / (400 * 2) - 6; + + /* For second phase of HS mode */ + hsscll = fclk_rate / (dev->speed * 2) - 6; + hssclh = fclk_rate / (dev->speed * 2) - 6; + } else { + /* To handle F/S modes */ + fsscll = internal_clk / (dev->speed * 2) - 6; + fssclh = internal_clk / (dev->speed * 2) - 6; + } + scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll; + sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh; + } else { + /* Program desired operating rate */ + fclk_rate /= (psc + 1) * 1000; + if (psc > 2) + psc = 2; + scll = fclk_rate / (dev->speed * 2) - 7 + psc; + sclh = fclk_rate / (dev->speed * 2) - 7 + psc; + } + /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */ omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc); - /* Program desired operating rate */ - fclk_rate /= (psc + 1) * 1000; - if (psc > 2) - psc = 2; - - omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, - fclk_rate / (clock * 2) - 7 + psc); - omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, - fclk_rate / (clock * 2) - 7 + psc); + /* SCL low and high time values */ + omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll); + omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh); /* Take the I2C module out of reset: */ omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); @@ -324,6 +355,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, dev->cmd_err = 0; w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT; + + /* High speed configuration */ + if (dev->speed > 400) + w |= OMAP_I2C_CON_OPMODE; + if (msg->flags & I2C_M_TEN) w |= OMAP_I2C_CON_XA; if (!(msg->flags & I2C_M_RD)) @@ -564,6 +600,7 @@ omap_i2c_probe(struct platform_device *pdev) struct i2c_adapter *adap; struct resource *mem, *irq, *ioarea; int r; + u32 *speed = NULL; /* NOTE: driver uses the static register mapping */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -584,17 +621,18 @@ omap_i2c_probe(struct platform_device *pdev) return -EBUSY; } - if (clock > 200) - clock = 400; /* Fast mode */ - else - clock = 100; /* Standard mode */ - dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL); if (!dev) { r = -ENOMEM; goto err_release_region; } + if (pdev->dev.platform_data != NULL) + speed = (u32 *) pdev->dev.platform_data; + else + *speed = 100; /* Defualt speed */ + + dev->speed = *speed; dev->dev = &pdev->dev; dev->irq = irq->start; dev->base = ioremap(mem->start, mem->end - mem->start + 1); @@ -625,7 +663,7 @@ omap_i2c_probe(struct platform_device *pdev) } r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", - pdev->id, r >> 4, r & 0xf, clock); + pdev->id, r >> 4, r & 0xf, dev->speed); adap = &dev->adapter; i2c_set_adapdata(adap, dev); -- cgit v1.2.3-58-ga151 From b6ee52c39999b2f3bcd9e26f0edf1f07599cf40e Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Fri, 21 Nov 2008 13:39:46 -0800 Subject: i2c-omap: FIFO handling support and broken hw workaround for i2c-omap Based on an earlier patch from Nishant Menon: - Transfers can use FIFO on FIFO capable devices - Prevents errors for HSI2C if FIFO is not used - Implemented errenous handling of STT-STP handling on SDP2430 Also merged in is a fix from Jaron Marini to fix occasional i2c hang if OMAP_I2C_CON_STT remains asserted. Signed-off-by: Jason P Marini Signed-off-by: Nishanth Menon Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 190 +++++++++++++++++++++++++++++++++--------- 1 file changed, 150 insertions(+), 40 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index b0aa0f8b564b..9ae4b74f3d1a 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -55,8 +55,11 @@ #define OMAP_I2C_SCLL_REG 0x34 #define OMAP_I2C_SCLH_REG 0x38 #define OMAP_I2C_SYSTEST_REG 0x3c +#define OMAP_I2C_BUFSTAT_REG 0x40 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ +#define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ +#define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */ #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */ #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */ #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */ @@ -64,7 +67,8 @@ #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */ /* I2C Status Register (OMAP_I2C_STAT): */ -#define OMAP_I2C_STAT_SBD (1 << 15) /* Single byte data */ +#define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */ +#define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */ #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */ #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ @@ -78,12 +82,14 @@ /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ +#define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */ +#define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */ /* I2C Configuration Register (OMAP_I2C_CON): */ #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ -#define OMAP_I2C_CON_OPMODE (1 << 12) /* High Speed support */ +#define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */ #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ @@ -127,7 +133,12 @@ struct omap_i2c_dev { u8 *buf; size_t buf_len; struct i2c_adapter adapter; + u8 fifo_size; /* use as flag and value + * fifo_size==0 implies no fifo + * if set, should be trsh+1 + */ unsigned rev1:1; + unsigned b_hw:1; /* bad h/w fixes */ unsigned idle:1; u16 iestate; /* Saved interrupt register */ }; @@ -297,6 +308,14 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll); omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh); + if (dev->fifo_size) + /* Note: setup required fifo size - 1 */ + omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, + (dev->fifo_size - 1) << 8 | /* RTRSH */ + OMAP_I2C_BUF_RXFIF_CLR | + (dev->fifo_size - 1) | /* XTRSH */ + OMAP_I2C_BUF_TXFIF_CLR); + /* Take the I2C module out of reset: */ omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); @@ -304,7 +323,8 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | - OMAP_I2C_IE_AL)); + OMAP_I2C_IE_AL) | ((dev->fifo_size) ? + (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0)); return 0; } @@ -351,6 +371,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len); + /* Clear the FIFO Buffers */ + w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); + w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR; + omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w); + init_completion(&dev->cmd_complete); dev->cmd_err = 0; @@ -358,16 +383,39 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, /* High speed configuration */ if (dev->speed > 400) - w |= OMAP_I2C_CON_OPMODE; + w |= OMAP_I2C_CON_OPMODE_HS; if (msg->flags & I2C_M_TEN) w |= OMAP_I2C_CON_XA; if (!(msg->flags & I2C_M_RD)) w |= OMAP_I2C_CON_TRX; - if (stop) + if (!dev->b_hw && stop) w |= OMAP_I2C_CON_STP; omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); + /* + * Don't write stt and stp together on some hardware. + */ + if (dev->b_hw && stop) { + unsigned long delay = jiffies + OMAP_I2C_TIMEOUT; + u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); + while (con & OMAP_I2C_CON_STT) { + con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); + + /* Let the user know if i2c is in a bad state */ + if (time_after(jiffies, delay)) { + dev_err(dev->dev, "controller timed out " + "waiting for start condition to finish\n"); + return -ETIMEDOUT; + } + cpu_relax(); + } + + w |= OMAP_I2C_CON_STP; + w &= ~OMAP_I2C_CON_STT; + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); + } + /* * REVISIT: We should abort the transfer on signals, but the bus goes * into arbitration and we're currently unable to recover from it. @@ -516,7 +564,7 @@ omap_i2c_isr(int this_irq, void *dev_id) struct omap_i2c_dev *dev = dev_id; u16 bits; u16 stat, w; - int count = 0; + int err, count = 0; if (dev->idle) return IRQ_NONE; @@ -531,39 +579,94 @@ omap_i2c_isr(int this_irq, void *dev_id) omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); - if (stat & OMAP_I2C_STAT_ARDY) { - omap_i2c_complete_cmd(dev, 0); - continue; + err = 0; + if (stat & OMAP_I2C_STAT_NACK) { + err |= OMAP_I2C_STAT_NACK; + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, + OMAP_I2C_CON_STP); } - if (stat & OMAP_I2C_STAT_RRDY) { - w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); - if (dev->buf_len) { - *dev->buf++ = w; - dev->buf_len--; + if (stat & OMAP_I2C_STAT_AL) { + dev_err(dev->dev, "Arbitration lost\n"); + err |= OMAP_I2C_STAT_AL; + } + if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK | + OMAP_I2C_STAT_AL)) + omap_i2c_complete_cmd(dev, err); + if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) { + u8 num_bytes = 1; + if (dev->fifo_size) { + if (stat & OMAP_I2C_STAT_RRDY) + num_bytes = dev->fifo_size; + else + num_bytes = omap_i2c_read_reg(dev, + OMAP_I2C_BUFSTAT_REG); + } + while (num_bytes) { + num_bytes--; + w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); if (dev->buf_len) { - *dev->buf++ = w >> 8; + *dev->buf++ = w; dev->buf_len--; + /* Data reg from 2430 is 8 bit wide */ + if (!cpu_is_omap2430()) { + if (dev->buf_len) { + *dev->buf++ = w >> 8; + dev->buf_len--; + } + } + } else { + if (stat & OMAP_I2C_STAT_RRDY) + dev_err(dev->dev, + "RRDY IRQ while no data" + " requested\n"); + if (stat & OMAP_I2C_STAT_RDR) + dev_err(dev->dev, + "RDR IRQ while no data" + " requested\n"); + break; } - } else - dev_err(dev->dev, "RRDY IRQ while no data " - "requested\n"); - omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); + } + omap_i2c_ack_stat(dev, + stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)); continue; } - if (stat & OMAP_I2C_STAT_XRDY) { - w = 0; - if (dev->buf_len) { - w = *dev->buf++; - dev->buf_len--; + if (stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)) { + u8 num_bytes = 1; + if (dev->fifo_size) { + if (stat & OMAP_I2C_STAT_XRDY) + num_bytes = dev->fifo_size; + else + num_bytes = omap_i2c_read_reg(dev, + OMAP_I2C_BUFSTAT_REG); + } + while (num_bytes) { + num_bytes--; + w = 0; if (dev->buf_len) { - w |= *dev->buf++ << 8; + w = *dev->buf++; dev->buf_len--; + /* Data reg from 2430 is 8 bit wide */ + if (!cpu_is_omap2430()) { + if (dev->buf_len) { + w |= *dev->buf++ << 8; + dev->buf_len--; + } + } + } else { + if (stat & OMAP_I2C_STAT_XRDY) + dev_err(dev->dev, + "XRDY IRQ while no " + "data to send\n"); + if (stat & OMAP_I2C_STAT_XDR) + dev_err(dev->dev, + "XDR IRQ while no " + "data to send\n"); + break; } - } else - dev_err(dev->dev, "XRDY IRQ while no " - "data to send\n"); - omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); - omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); + omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); + } + omap_i2c_ack_stat(dev, + stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)); continue; } if (stat & OMAP_I2C_STAT_ROVR) { @@ -571,18 +674,9 @@ omap_i2c_isr(int this_irq, void *dev_id) dev->cmd_err |= OMAP_I2C_STAT_ROVR; } if (stat & OMAP_I2C_STAT_XUDF) { - dev_err(dev->dev, "Transmit overflow\n"); + dev_err(dev->dev, "Transmit underflow\n"); dev->cmd_err |= OMAP_I2C_STAT_XUDF; } - if (stat & OMAP_I2C_STAT_NACK) { - omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK); - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, - OMAP_I2C_CON_STP); - } - if (stat & OMAP_I2C_STAT_AL) { - dev_err(dev->dev, "Arbitration lost\n"); - omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL); - } } return count ? IRQ_HANDLED : IRQ_NONE; @@ -651,6 +745,22 @@ omap_i2c_probe(struct platform_device *pdev) if (cpu_is_omap15xx()) dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20; + if (cpu_is_omap2430()) { + u16 s; + + /* Set up the fifo size - Get total size */ + s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3; + dev->fifo_size = 0x8 << s; + + /* + * Set up notification threshold as half the total available + * size. This is to ensure that we can handle the status on int + * call back latencies. + */ + dev->fifo_size = (dev->fifo_size / 2); + dev->b_hw = 1; /* Enable hardware fixes */ + } + /* reset ASAP, clearing any IRQs */ omap_i2c_init(dev); -- cgit v1.2.3-58-ga151 From 3d522fb41ead214d9d9236ec184271633e1cfc2f Mon Sep 17 00:00:00 2001 From: Chandra shekhar Date: Fri, 21 Nov 2008 13:39:46 -0800 Subject: i2c-omap: Add support for omap34xx Add support for omap34xx Signed-off-by: chandra shekhar Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 9ae4b74f3d1a..3f7726a43125 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -156,7 +156,7 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) static int omap_i2c_get_clocks(struct omap_i2c_dev *dev) { - if (cpu_is_omap16xx() || cpu_is_omap24xx()) { + if (cpu_is_omap16xx() || cpu_class_is_omap2()) { dev->iclk = clk_get(dev->dev, "i2c_ick"); if (IS_ERR(dev->iclk)) { dev->iclk = NULL; @@ -266,7 +266,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) psc = fclk_rate / 12000000; } - if (cpu_is_omap2430()) { + if (cpu_is_omap2430() || cpu_is_omap34xx()) { /* HSI2C controller internal clk rate should be 19.2 Mhz */ internal_clk = 19200; @@ -608,7 +608,8 @@ omap_i2c_isr(int this_irq, void *dev_id) *dev->buf++ = w; dev->buf_len--; /* Data reg from 2430 is 8 bit wide */ - if (!cpu_is_omap2430()) { + if (!cpu_is_omap2430() && + !cpu_is_omap34xx()) { if (dev->buf_len) { *dev->buf++ = w >> 8; dev->buf_len--; @@ -646,7 +647,8 @@ omap_i2c_isr(int this_irq, void *dev_id) w = *dev->buf++; dev->buf_len--; /* Data reg from 2430 is 8 bit wide */ - if (!cpu_is_omap2430()) { + if (!cpu_is_omap2430() && + !cpu_is_omap34xx()) { if (dev->buf_len) { w |= *dev->buf++ << 8; dev->buf_len--; @@ -694,7 +696,7 @@ omap_i2c_probe(struct platform_device *pdev) struct i2c_adapter *adap; struct resource *mem, *irq, *ioarea; int r; - u32 *speed = NULL; + u32 speed = 0; /* NOTE: driver uses the static register mapping */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -722,11 +724,11 @@ omap_i2c_probe(struct platform_device *pdev) } if (pdev->dev.platform_data != NULL) - speed = (u32 *) pdev->dev.platform_data; + speed = *(u32 *)pdev->dev.platform_data; else - *speed = 100; /* Defualt speed */ + speed = 100; /* Defualt speed */ - dev->speed = *speed; + dev->speed = speed; dev->dev = &pdev->dev; dev->irq = irq->start; dev->base = ioremap(mem->start, mem->end - mem->start + 1); @@ -745,7 +747,7 @@ omap_i2c_probe(struct platform_device *pdev) if (cpu_is_omap15xx()) dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20; - if (cpu_is_omap2430()) { + if (cpu_is_omap2430() || cpu_is_omap34xx()) { u16 s; /* Set up the fifo size - Get total size */ -- cgit v1.2.3-58-ga151 From 510be9c9ad852dc902fd926ec8e03b67e62d8915 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:46 -0800 Subject: i2c-omap: Mark init-only functions as __init Mark functions called only at init time as __init. Signed-off-by: Paul Walmsley Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 3f7726a43125..61d2e5ad6d6c 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -154,7 +154,7 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) return __raw_readw(i2c_dev->base + reg); } -static int omap_i2c_get_clocks(struct omap_i2c_dev *dev) +static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev) { if (cpu_is_omap16xx() || cpu_class_is_omap2()) { dev->iclk = clk_get(dev->dev, "i2c_ick"); @@ -689,7 +689,7 @@ static const struct i2c_algorithm omap_i2c_algo = { .functionality = omap_i2c_func, }; -static int +static int __init omap_i2c_probe(struct platform_device *pdev) { struct omap_i2c_dev *dev; -- cgit v1.2.3-58-ga151 From 43469d8e2aaecc61403d1527dda7441fba8c0e50 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:47 -0800 Subject: i2c-omap: Don't compile in OMAP15xx I2C ISR for non-OMAP15xx builds Skip compiling OMAP15xx I2C ISR for non-OMAP15xx builds. Saves 400 bytes of text for most OMAP builds. Signed-off-by: Paul Walmsley Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 61d2e5ad6d6c..195c3d1a725e 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -503,6 +503,9 @@ omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat) omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); } +/* rev1 devices are apparently only on some 15xx */ +#ifdef CONFIG_ARCH_OMAP15XX + static irqreturn_t omap_i2c_rev1_isr(int this_irq, void *dev_id) { @@ -557,6 +560,9 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id) return IRQ_HANDLED; } +#else +#define omap_i2c_rev1_isr 0 +#endif static irqreturn_t omap_i2c_isr(int this_irq, void *dev_id) -- cgit v1.2.3-58-ga151 From c1a473bde4c06e8e6996ce3a33121b7a9a86b4b9 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Fri, 21 Nov 2008 13:39:47 -0800 Subject: i2c-omap: Clean-up i2c-omap Minor sparse, checkpatch and formatting clean-up. Also update copyrights. Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 195c3d1a725e..4aeebad8ec93 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -2,13 +2,16 @@ * TI OMAP I2C master mode driver * * Copyright (C) 2003 MontaVista Software, Inc. - * Copyright (C) 2004 Texas Instruments. - * - * Updated to work with multiple I2C interfaces on 24xx by - * Tony Lindgren and Imre Deak * Copyright (C) 2005 Nokia Corporation + * Copyright (C) 2004 - 2007 Texas Instruments. * - * Cleaned up by Juha Yrjölä + * Originally written by MontaVista Software, Inc. + * Additional contributions by: + * Tony Lindgren + * Imre Deak + * Juha Yrjölä + * Syed Khasim + * Nishant Menon * * 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 @@ -33,8 +36,7 @@ #include #include #include - -#include +#include /* timeout waiting for the controller to respond */ #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) @@ -204,7 +206,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); if (dev->rev1) { - iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ + iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ } else { omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate); @@ -321,9 +323,9 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) /* Enable interrupts */ omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, - (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | - OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | - OMAP_I2C_IE_AL) | ((dev->fifo_size) ? + (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | + OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | + OMAP_I2C_IE_AL) | ((dev->fifo_size) ? (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0)); return 0; } @@ -389,8 +391,10 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, w |= OMAP_I2C_CON_XA; if (!(msg->flags & I2C_M_RD)) w |= OMAP_I2C_CON_TRX; + if (!dev->b_hw && stop) w |= OMAP_I2C_CON_STP; + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); /* @@ -468,7 +472,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) omap_i2c_unidle(dev); - if ((r = omap_i2c_wait_for_bb(dev)) < 0) + r = omap_i2c_wait_for_bb(dev); + if (r < 0) goto out; for (i = 0; i < num; i++) { @@ -561,7 +566,7 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id) return IRQ_HANDLED; } #else -#define omap_i2c_rev1_isr 0 +#define omap_i2c_rev1_isr NULL #endif static irqreturn_t -- cgit v1.2.3-58-ga151 From 3831f154418e058616129942e8175dc4c7e4a1d8 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:47 -0800 Subject: i2c-omap: fix I2C timeouts due to recursive omap_i2c_{un,}idle() omap_i2c_unidle() and omap_i2c_idle() are called recursively during omap_i2c_probe(). This is evidently unexpected and will wipe out the I2C interrupt enable register the second time that omap_i2c_idle() is called consecutively. Any I2C transactions following a probe of a bus with at least one device on it will then time out. Fix by moving omap_i2c_idle() further up in omap_i2c_probe(). Ensure the I2C controller is marked as idle before the probe starts. Also attempt to catch future reappearances of this bug early in development by warning in omap_i2c_{un,}idle() when they are called recursively. Problem reported by David Brownell . Tested on 3430SDP and 2430SDP. Signed-off-by: Paul Walmsley Cc: David Brownell Cc: Richard Woodruff Acked-by; Steve Sakoman Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 4aeebad8ec93..40a1e4bc92f1 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -191,6 +191,8 @@ static void omap_i2c_put_clocks(struct omap_i2c_dev *dev) static void omap_i2c_unidle(struct omap_i2c_dev *dev) { + WARN_ON(!dev->idle); + if (dev->iclk != NULL) clk_enable(dev->iclk); clk_enable(dev->fclk); @@ -203,6 +205,8 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) { u16 iv; + WARN_ON(dev->idle); + dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); if (dev->rev1) { @@ -740,6 +744,7 @@ omap_i2c_probe(struct platform_device *pdev) speed = 100; /* Defualt speed */ dev->speed = speed; + dev->idle = 1; dev->dev = &pdev->dev; dev->irq = irq->start; dev->base = ioremap(mem->start, mem->end - mem->start + 1); @@ -788,6 +793,8 @@ omap_i2c_probe(struct platform_device *pdev) dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", pdev->id, r >> 4, r & 0xf, dev->speed); + omap_i2c_idle(dev); + adap = &dev->adapter; i2c_set_adapdata(adap, dev); adap->owner = THIS_MODULE; @@ -804,8 +811,6 @@ omap_i2c_probe(struct platform_device *pdev) goto err_free_irq; } - omap_i2c_idle(dev); - return 0; err_free_irq: -- cgit v1.2.3-58-ga151 From 9c76b878eb3f837ff98b37aa254e6cc7942e946b Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:55 -0800 Subject: i2c-omap: convert 'rev1' flag to generic 'rev' u8 i2c-omap discriminates only between "revision 1" or "greater than revision 1." A following patch introduces code that must also discriminate between rev2.x, rev3.6, and rev3.12 controllers. Support this by storing the full revision data from the I2C_REV register, rather than just a single bit. The revision definitions may need to be extended for other ES levels that aren't currently available here. rev3.6 is what's present on the 2430SDP here (unknown ES revision); rev3.12 is used on the 3430ES2 here. Signed-off-by: Paul Walmsley Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 40a1e4bc92f1..3ac510d9c9ba 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -38,6 +38,13 @@ #include #include +/* I2C controller revisions */ +#define OMAP_I2C_REV_2 0x20 + +/* I2C controller revisions present on specific hardware */ +#define OMAP_I2C_REV_ON_2430 0x36 +#define OMAP_I2C_REV_ON_3430 0x3C + /* timeout waiting for the controller to respond */ #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) @@ -139,7 +146,7 @@ struct omap_i2c_dev { * fifo_size==0 implies no fifo * if set, should be trsh+1 */ - unsigned rev1:1; + u8 rev; unsigned b_hw:1; /* bad h/w fixes */ unsigned idle:1; u16 iestate; /* Saved interrupt register */ @@ -209,7 +216,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); - if (dev->rev1) { + if (dev->rev < OMAP_I2C_REV_2) { iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ } else { omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate); @@ -231,7 +238,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long timeout; unsigned long internal_clk = 0; - if (!dev->rev1) { + if (dev->rev >= OMAP_I2C_REV_2) { omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ @@ -710,6 +717,7 @@ omap_i2c_probe(struct platform_device *pdev) struct omap_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem, *irq, *ioarea; + void *isr; int r; u32 speed = 0; @@ -760,8 +768,7 @@ omap_i2c_probe(struct platform_device *pdev) omap_i2c_unidle(dev); - if (cpu_is_omap15xx()) - dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20; + dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; if (cpu_is_omap2430() || cpu_is_omap34xx()) { u16 s; @@ -782,16 +789,16 @@ omap_i2c_probe(struct platform_device *pdev) /* reset ASAP, clearing any IRQs */ omap_i2c_init(dev); - r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr, - 0, pdev->name, dev); + isr = (dev->rev < OMAP_I2C_REV_2) ? omap_i2c_rev1_isr : omap_i2c_isr; + r = request_irq(dev->irq, isr, 0, pdev->name, dev); if (r) { dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); goto err_unuse_clocks; } - r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; + dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", - pdev->id, r >> 4, r & 0xf, dev->speed); + pdev->id, dev->rev >> 4, dev->rev & 0xf, dev->speed); omap_i2c_idle(dev); -- cgit v1.2.3-58-ga151 From fdd07fe6f6fe54250d8b1126b42ebdc72d938f05 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Fri, 21 Nov 2008 13:39:55 -0800 Subject: i2c-omap: reprogram OCP_SYSCONFIG register after reset The I2C controller clears its OCP_SYSCONFIG register after an OCP soft reset. Reprogram OCP_SYSCONFIG for maximum power savings on rev3.6 controllers and beyond. On 2430, this involves setting the module AUTOIDLE bit. On 3430, this includes module AUTOIDLE, wakeup enable, slave smart-idle, and considers only the module functional clock state for idle-ack. Boot-tested on 2430SDP and 3430SDP. Signed-off-by: Paul Walmsley Cc: Richard Woodruff Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 40 ++++++++++++++++++++++++++++++++++------ 1 file changed, 34 insertions(+), 6 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 3ac510d9c9ba..b20235415878 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -123,11 +123,19 @@ #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ #endif -/* I2C System Status register (OMAP_I2C_SYSS): */ -#define OMAP_I2C_SYSS_RDONE (1 << 0) /* Reset Done */ +/* OCP_SYSSTATUS bit definitions */ +#define SYSS_RESETDONE_MASK (1 << 0) + +/* OCP_SYSCONFIG bit definitions */ +#define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) +#define SYSC_SIDLEMODE_MASK (0x3 << 3) +#define SYSC_ENAWAKEUP_MASK (1 << 2) +#define SYSC_SOFTRESET_MASK (1 << 1) +#define SYSC_AUTOIDLE_MASK (1 << 0) + +#define SYSC_IDLEMODE_SMART 0x2 +#define SYSC_CLOCKACTIVITY_FCLK 0x2 -/* I2C System Configuration Register (OMAP_I2C_SYSC): */ -#define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */ struct omap_i2c_dev { struct device *dev; @@ -239,13 +247,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long internal_clk = 0; if (dev->rev >= OMAP_I2C_REV_2) { - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST); + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ timeout = jiffies + OMAP_I2C_TIMEOUT; omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & - OMAP_I2C_SYSS_RDONE)) { + SYSS_RESETDONE_MASK)) { if (time_after(jiffies, timeout)) { dev_warn(dev->dev, "timeout waiting " "for controller reset\n"); @@ -253,6 +261,26 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) } msleep(1); } + + /* SYSC register is cleared by the reset; rewrite it */ + if (dev->rev == OMAP_I2C_REV_ON_2430) { + + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, + SYSC_AUTOIDLE_MASK); + + } else if (dev->rev >= OMAP_I2C_REV_ON_3430) { + u32 v; + + v = SYSC_AUTOIDLE_MASK; + v |= SYSC_ENAWAKEUP_MASK; + v |= (SYSC_IDLEMODE_SMART << + __ffs(SYSC_SIDLEMODE_MASK)); + v |= (SYSC_CLOCKACTIVITY_FCLK << + __ffs(SYSC_CLOCKACTIVITY_MASK)); + + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v); + + } } omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); -- cgit v1.2.3-58-ga151 From 5043e9e737c4909e7f187d479227df46f5a2dd53 Mon Sep 17 00:00:00 2001 From: Kalle Jokiniemi Date: Fri, 21 Nov 2008 13:39:55 -0800 Subject: i2c-omap: Enable I2C wakeups for 34xx I2C_WE registers were not configured, which caused huge delays in I2C operations while cpu idle was enabled and omap entered WFI. This patch enables all I2C wakeup sources. Signed-off-by: Kalle Jokiniemi Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index b20235415878..96f3bedb2799 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -52,6 +52,8 @@ #define OMAP_I2C_IE_REG 0x04 #define OMAP_I2C_STAT_REG 0x08 #define OMAP_I2C_IV_REG 0x0c +/* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ +#define OMAP_I2C_WE_REG 0x0c #define OMAP_I2C_SYSS_REG 0x10 #define OMAP_I2C_BUF_REG 0x14 #define OMAP_I2C_CNT_REG 0x18 @@ -89,6 +91,24 @@ #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */ +/* I2C WE wakeup enable register */ +#define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */ +#define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */ +#define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/ +#define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */ +#define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */ +#define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */ +#define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */ +#define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */ +#define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */ +#define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */ + +#define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \ + OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \ + OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \ + OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \ + OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE) + /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ @@ -279,6 +299,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) __ffs(SYSC_CLOCKACTIVITY_MASK)); omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v); + /* + * Enabling all wakup sources to stop I2C freezing on + * WFI instruction. + * REVISIT: Some wkup sources might not be needed. + */ + omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, + OMAP_I2C_WE_ALL); } } -- cgit v1.2.3-58-ga151