mirror of https://gitee.com/openkylin/linux.git
i2c: omap: Fix the revision register read
The revision register on OMAP4 is a 16-bit lo and a 16-bit hi. Currently the driver reads only the lower 8-bits. Fix the same by preventing the truncating of the rev register for OMAP4. Also use the scheme bit ie bit-14 of the hi register to know if it is OMAP_I2C_IP_VERSION_2. On platforms previous to OMAP4 the offset 0x04 is IE register whose bit-14 reset value is 0, the code uses the same to its advantage. Also since the omap_i2c_read_reg uses reg_map_ip_* a raw_readw is done to fetch the revision register. The dev->regs is populated after reading the rev_hi. A NULL check has been added in the resume handler to prevent the access before the setting of the regs. Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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@ -49,9 +49,10 @@
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#define OMAP_I2C_OMAP1_REV_2 0x20
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#define OMAP_I2C_OMAP1_REV_2 0x20
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/* I2C controller revisions present on specific hardware */
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/* I2C controller revisions present on specific hardware */
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#define OMAP_I2C_REV_ON_2430 0x36
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#define OMAP_I2C_REV_ON_2430 0x00000036
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#define OMAP_I2C_REV_ON_3430_3530 0x3C
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#define OMAP_I2C_REV_ON_3430_3530 0x0000003C
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#define OMAP_I2C_REV_ON_3630_4430 0x40
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#define OMAP_I2C_REV_ON_3630 0x00000040
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#define OMAP_I2C_REV_ON_4430_PLUS 0x50400002
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/* timeout waiting for the controller to respond */
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/* timeout waiting for the controller to respond */
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#define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
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#define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
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@ -203,7 +204,7 @@ struct omap_i2c_dev {
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* fifo_size==0 implies no fifo
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* fifo_size==0 implies no fifo
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* if set, should be trsh+1
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* if set, should be trsh+1
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*/
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*/
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u8 rev;
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u32 rev;
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unsigned b_hw:1; /* bad h/w fixes */
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unsigned b_hw:1; /* bad h/w fixes */
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unsigned receiver:1; /* true when we're in receiver mode */
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unsigned receiver:1; /* true when we're in receiver mode */
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u16 iestate; /* Saved interrupt register */
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u16 iestate; /* Saved interrupt register */
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@ -493,7 +494,7 @@ static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx)
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omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf);
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omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf);
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if (dev->rev < OMAP_I2C_REV_ON_3630_4430)
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if (dev->rev < OMAP_I2C_REV_ON_3630)
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dev->b_hw = 1; /* Enable hardware fixes */
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dev->b_hw = 1; /* Enable hardware fixes */
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/* calculate wakeup latency constraint for MPU */
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/* calculate wakeup latency constraint for MPU */
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@ -1051,6 +1052,16 @@ static const struct of_device_id omap_i2c_of_match[] = {
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MODULE_DEVICE_TABLE(of, omap_i2c_of_match);
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MODULE_DEVICE_TABLE(of, omap_i2c_of_match);
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#endif
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#endif
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#define OMAP_I2C_SCHEME(rev) ((rev & 0xc000) >> 14)
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#define OMAP_I2C_REV_SCHEME_0_MAJOR(rev) (rev >> 4)
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#define OMAP_I2C_REV_SCHEME_0_MINOR(rev) (rev & 0xf)
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#define OMAP_I2C_REV_SCHEME_1_MAJOR(rev) ((rev & 0x0700) >> 7)
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#define OMAP_I2C_REV_SCHEME_1_MINOR(rev) (rev & 0x1f)
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#define OMAP_I2C_SCHEME_0 0
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#define OMAP_I2C_SCHEME_1 1
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static int __devinit
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static int __devinit
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omap_i2c_probe(struct platform_device *pdev)
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omap_i2c_probe(struct platform_device *pdev)
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{
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{
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@ -1063,6 +1074,8 @@ omap_i2c_probe(struct platform_device *pdev)
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const struct of_device_id *match;
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const struct of_device_id *match;
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int irq;
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int irq;
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int r;
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int r;
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u32 rev;
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u16 minor, major;
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/* NOTE: driver uses the static register mapping */
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/* NOTE: driver uses the static register mapping */
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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@ -1127,11 +1140,6 @@ omap_i2c_probe(struct platform_device *pdev)
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dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3;
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dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3;
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if (dev->dtrev == OMAP_I2C_IP_VERSION_2)
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dev->regs = (u8 *)reg_map_ip_v2;
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else
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dev->regs = (u8 *)reg_map_ip_v1;
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pm_runtime_enable(dev->dev);
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pm_runtime_enable(dev->dev);
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pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT);
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pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT);
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pm_runtime_use_autosuspend(dev->dev);
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pm_runtime_use_autosuspend(dev->dev);
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@ -1140,7 +1148,31 @@ omap_i2c_probe(struct platform_device *pdev)
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if (IS_ERR_VALUE(r))
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if (IS_ERR_VALUE(r))
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goto err_free_mem;
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goto err_free_mem;
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dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
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/*
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* Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2.
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* On omap1/3/2 Offset 4 is IE Reg the bit [15:14] is 0 at reset.
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* Also since the omap_i2c_read_reg uses reg_map_ip_* a
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* raw_readw is done.
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*/
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rev = __raw_readw(dev->base + 0x04);
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switch (OMAP_I2C_SCHEME(rev)) {
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case OMAP_I2C_SCHEME_0:
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dev->regs = (u8 *)reg_map_ip_v1;
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dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG);
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minor = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev);
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major = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev);
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break;
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case OMAP_I2C_SCHEME_1:
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/* FALLTHROUGH */
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default:
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dev->regs = (u8 *)reg_map_ip_v2;
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rev = (rev << 16) |
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omap_i2c_read_reg(dev, OMAP_I2C_IP_V2_REVNB_LO);
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minor = OMAP_I2C_REV_SCHEME_1_MINOR(rev);
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major = OMAP_I2C_REV_SCHEME_1_MAJOR(rev);
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dev->rev = rev;
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}
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dev->errata = 0;
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dev->errata = 0;
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@ -1165,7 +1197,7 @@ omap_i2c_probe(struct platform_device *pdev)
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dev->fifo_size = (dev->fifo_size / 2);
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dev->fifo_size = (dev->fifo_size / 2);
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if (dev->rev < OMAP_I2C_REV_ON_3630_4430)
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if (dev->rev < OMAP_I2C_REV_ON_3630)
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dev->b_hw = 1; /* Enable hardware fixes */
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dev->b_hw = 1; /* Enable hardware fixes */
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/* calculate wakeup latency constraint for MPU */
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/* calculate wakeup latency constraint for MPU */
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@ -1209,7 +1241,7 @@ omap_i2c_probe(struct platform_device *pdev)
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}
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}
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dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", adap->nr,
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dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", adap->nr,
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dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed);
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dev->dtrev, major, minor, dev->speed);
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of_i2c_register_devices(adap);
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of_i2c_register_devices(adap);
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@ -1275,6 +1307,9 @@ static int omap_i2c_runtime_resume(struct device *dev)
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struct platform_device *pdev = to_platform_device(dev);
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struct platform_device *pdev = to_platform_device(dev);
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struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
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struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
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if (!_dev->regs)
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return 0;
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if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
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if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
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omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
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omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
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omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
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omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
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