/* * L3 code * * Copyright (C) 2008, Christian Pellegrin * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * * based on: * * L3 bus algorithm module. * * Copyright (C) 2001 Russell King, All Rights Reserved. * * */ #include #include #include #include #include #include /* * Send one byte of data to the chip. Data is latched into the chip on * the rising edge of the clock. */ static void sendbyte(struct l3_pins *adap, unsigned int byte) { int i; for (i = 0; i < 8; i++) { adap->setclk(adap, 0); udelay(adap->data_hold); adap->setdat(adap, byte & 1); udelay(adap->data_setup); adap->setclk(adap, 1); udelay(adap->clock_high); byte >>= 1; } } /* * Send a set of bytes to the chip. We need to pulse the MODE line * between each byte, but never at the start nor at the end of the * transfer. */ static void sendbytes(struct l3_pins *adap, const u8 *buf, int len) { int i; for (i = 0; i < len; i++) { if (i) { udelay(adap->mode_hold); adap->setmode(adap, 0); udelay(adap->mode); } adap->setmode(adap, 1); udelay(adap->mode_setup); sendbyte(adap, buf[i]); } } int l3_write(struct l3_pins *adap, u8 addr, u8 *data, int len) { adap->setclk(adap, 1); adap->setdat(adap, 1); adap->setmode(adap, 1); udelay(adap->mode); adap->setmode(adap, 0); udelay(adap->mode_setup); sendbyte(adap, addr); udelay(adap->mode_hold); sendbytes(adap, data, len); adap->setclk(adap, 1); adap->setdat(adap, 1); adap->setmode(adap, 0); return len; } EXPORT_SYMBOL_GPL(l3_write); static void l3_set_clk(struct l3_pins *adap, int val) { gpio_set_value(adap->gpio_clk, val); } static void l3_set_data(struct l3_pins *adap, int val) { gpio_set_value(adap->gpio_data, val); } static void l3_set_mode(struct l3_pins *adap, int val) { gpio_set_value(adap->gpio_mode, val); } int l3_set_gpio_ops(struct device *dev, struct l3_pins *adap) { int ret; if (!adap->use_gpios) return -EINVAL; ret = devm_gpio_request_one(dev, adap->gpio_data, GPIOF_OUT_INIT_LOW, "l3_data"); if (ret < 0) return ret; adap->setdat = l3_set_data; ret = devm_gpio_request_one(dev, adap->gpio_clk, GPIOF_OUT_INIT_LOW, "l3_clk"); if (ret < 0) return ret; adap->setclk = l3_set_clk; ret = devm_gpio_request_one(dev, adap->gpio_mode, GPIOF_OUT_INIT_LOW, "l3_mode"); if (ret < 0) return ret; adap->setmode = l3_set_mode; return 0; } EXPORT_SYMBOL_GPL(l3_set_gpio_ops); MODULE_DESCRIPTION("L3 bit-banging driver"); MODULE_AUTHOR("Christian Pellegrin "); MODULE_LICENSE("GPL"); -next.git/commit/drivers?id=161e6d44a5e2d3f85365cb717d60e363171b39e6'>drivers/usb/host/whci/hcd.c
diff options
context:
space:
mode:
authorGabriel Krisman Bertazi <krisman@collabora.co.uk>2017-01-16 12:23:42 -0200
committerUlf Hansson <ulf.hansson@linaro.org>2017-01-31 11:26:49 +0100
commit161e6d44a5e2d3f85365cb717d60e363171b39e6 (patch)
tree5c8b730a137696ef979f05ceae869b6e0348794c /drivers/usb/host/whci/hcd.c
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
mmc: sdhci: Ignore unexpected CARD_INT interrupts
One of our kernelCI boxes hanged at boot because a faulty eSDHC device was triggering spurious CARD_INT interrupts for SD cards, causing CMD52 reads, which are not allowed for SD devices. This adds a sanity check to the interruption path, preventing that illegal command from getting sent if the CARD_INT interruption should be disabled. This quirk allows that particular machine to resume boot despite the faulty hardware, instead of getting hung dealing with thousands of mishandled interrupts. Suggested-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Cc: <stable@vger.kernel.org>
Diffstat (limited to 'drivers/usb/host/whci/hcd.c')