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602 lines
16 KiB
602 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Serial Port driver for Aspeed VUART device |
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* |
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* Copyright (C) 2016 Jeremy Kerr <[email protected]>, IBM Corp. |
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* Copyright (C) 2006 Arnd Bergmann <[email protected]>, IBM Corp. |
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*/ |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_platform.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/tty.h> |
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#include <linux/tty_flip.h> |
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#include <linux/clk.h> |
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#include "8250.h" |
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#define ASPEED_VUART_GCRA 0x20 |
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#define ASPEED_VUART_GCRA_VUART_EN BIT(0) |
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#define ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY BIT(1) |
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#define ASPEED_VUART_GCRA_DISABLE_HOST_TX_DISCARD BIT(5) |
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#define ASPEED_VUART_GCRB 0x24 |
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#define ASPEED_VUART_GCRB_HOST_SIRQ_MASK GENMASK(7, 4) |
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#define ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT 4 |
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#define ASPEED_VUART_ADDRL 0x28 |
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#define ASPEED_VUART_ADDRH 0x2c |
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#define ASPEED_VUART_DEFAULT_LPC_ADDR 0x3f8 |
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#define ASPEED_VUART_DEFAULT_SIRQ 4 |
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#define ASPEED_VUART_DEFAULT_SIRQ_POLARITY IRQ_TYPE_LEVEL_LOW |
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struct aspeed_vuart { |
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struct device *dev; |
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struct clk *clk; |
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int line; |
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struct timer_list unthrottle_timer; |
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struct uart_8250_port *port; |
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}; |
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|
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/* |
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* If we fill the tty flip buffers, we throttle the data ready interrupt |
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* to prevent dropped characters. This timeout defines how long we wait |
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* to (conditionally, depending on buffer state) unthrottle. |
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*/ |
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static const int unthrottle_timeout = HZ/10; |
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|
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/* |
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* The VUART is basically two UART 'front ends' connected by their FIFO |
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* (no actual serial line in between). One is on the BMC side (management |
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* controller) and one is on the host CPU side. |
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* |
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* It allows the BMC to provide to the host a "UART" that pipes into |
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* the BMC itself and can then be turned by the BMC into a network console |
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* of some sort for example. |
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* |
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* This driver is for the BMC side. The sysfs files allow the BMC |
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* userspace which owns the system configuration policy, to specify |
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* at what IO port and interrupt number the host side will appear |
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* to the host on the Host <-> BMC LPC bus. It could be different on a |
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* different system (though most of them use 3f8/4). |
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*/ |
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static inline u8 aspeed_vuart_readb(struct aspeed_vuart *vuart, u8 reg) |
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{ |
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return readb(vuart->port->port.membase + reg); |
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} |
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static inline void aspeed_vuart_writeb(struct aspeed_vuart *vuart, u8 val, u8 reg) |
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{ |
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writeb(val, vuart->port->port.membase + reg); |
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} |
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static ssize_t lpc_address_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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u16 addr; |
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addr = (aspeed_vuart_readb(vuart, ASPEED_VUART_ADDRH) << 8) | |
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(aspeed_vuart_readb(vuart, ASPEED_VUART_ADDRL)); |
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return snprintf(buf, PAGE_SIZE - 1, "0x%x\n", addr); |
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} |
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static int aspeed_vuart_set_lpc_address(struct aspeed_vuart *vuart, u32 addr) |
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{ |
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if (addr > U16_MAX) |
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return -EINVAL; |
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aspeed_vuart_writeb(vuart, addr >> 8, ASPEED_VUART_ADDRH); |
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aspeed_vuart_writeb(vuart, addr >> 0, ASPEED_VUART_ADDRL); |
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return 0; |
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} |
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static ssize_t lpc_address_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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u32 val; |
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int err; |
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err = kstrtou32(buf, 0, &val); |
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if (err) |
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return err; |
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err = aspeed_vuart_set_lpc_address(vuart, val); |
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return err ? : count; |
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} |
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static DEVICE_ATTR_RW(lpc_address); |
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static ssize_t sirq_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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u8 reg; |
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reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRB); |
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reg &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK; |
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reg >>= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT; |
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return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg); |
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} |
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static int aspeed_vuart_set_sirq(struct aspeed_vuart *vuart, u32 sirq) |
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{ |
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u8 reg; |
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if (sirq > (ASPEED_VUART_GCRB_HOST_SIRQ_MASK >> ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT)) |
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return -EINVAL; |
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sirq <<= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT; |
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sirq &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK; |
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reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRB); |
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reg &= ~ASPEED_VUART_GCRB_HOST_SIRQ_MASK; |
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reg |= sirq; |
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aspeed_vuart_writeb(vuart, reg, ASPEED_VUART_GCRB); |
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return 0; |
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} |
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static ssize_t sirq_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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unsigned long val; |
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int err; |
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err = kstrtoul(buf, 0, &val); |
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if (err) |
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return err; |
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err = aspeed_vuart_set_sirq(vuart, val); |
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return err ? : count; |
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} |
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static DEVICE_ATTR_RW(sirq); |
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static ssize_t sirq_polarity_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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u8 reg; |
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reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRA); |
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reg &= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY; |
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return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg ? 1 : 0); |
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} |
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static void aspeed_vuart_set_sirq_polarity(struct aspeed_vuart *vuart, |
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bool polarity) |
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{ |
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u8 reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRA); |
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if (polarity) |
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reg |= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY; |
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else |
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reg &= ~ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY; |
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aspeed_vuart_writeb(vuart, reg, ASPEED_VUART_GCRA); |
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} |
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static ssize_t sirq_polarity_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct aspeed_vuart *vuart = dev_get_drvdata(dev); |
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unsigned long val; |
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int err; |
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err = kstrtoul(buf, 0, &val); |
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if (err) |
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return err; |
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aspeed_vuart_set_sirq_polarity(vuart, val != 0); |
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return count; |
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} |
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static DEVICE_ATTR_RW(sirq_polarity); |
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static struct attribute *aspeed_vuart_attrs[] = { |
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&dev_attr_sirq.attr, |
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&dev_attr_sirq_polarity.attr, |
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&dev_attr_lpc_address.attr, |
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NULL, |
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}; |
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static const struct attribute_group aspeed_vuart_attr_group = { |
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.attrs = aspeed_vuart_attrs, |
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}; |
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static void aspeed_vuart_set_enabled(struct aspeed_vuart *vuart, bool enabled) |
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{ |
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u8 reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRA); |
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if (enabled) |
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reg |= ASPEED_VUART_GCRA_VUART_EN; |
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else |
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reg &= ~ASPEED_VUART_GCRA_VUART_EN; |
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aspeed_vuart_writeb(vuart, reg, ASPEED_VUART_GCRA); |
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} |
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static void aspeed_vuart_set_host_tx_discard(struct aspeed_vuart *vuart, |
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bool discard) |
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{ |
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u8 reg; |
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reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRA); |
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/* If the DISABLE_HOST_TX_DISCARD bit is set, discard is disabled */ |
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if (!discard) |
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reg |= ASPEED_VUART_GCRA_DISABLE_HOST_TX_DISCARD; |
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else |
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reg &= ~ASPEED_VUART_GCRA_DISABLE_HOST_TX_DISCARD; |
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aspeed_vuart_writeb(vuart, reg, ASPEED_VUART_GCRA); |
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} |
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static int aspeed_vuart_startup(struct uart_port *uart_port) |
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{ |
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struct uart_8250_port *uart_8250_port = up_to_u8250p(uart_port); |
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struct aspeed_vuart *vuart = uart_8250_port->port.private_data; |
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int rc; |
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rc = serial8250_do_startup(uart_port); |
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if (rc) |
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return rc; |
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aspeed_vuart_set_host_tx_discard(vuart, false); |
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return 0; |
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} |
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static void aspeed_vuart_shutdown(struct uart_port *uart_port) |
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{ |
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struct uart_8250_port *uart_8250_port = up_to_u8250p(uart_port); |
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struct aspeed_vuart *vuart = uart_8250_port->port.private_data; |
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aspeed_vuart_set_host_tx_discard(vuart, true); |
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serial8250_do_shutdown(uart_port); |
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} |
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static void __aspeed_vuart_set_throttle(struct uart_8250_port *up, |
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bool throttle) |
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{ |
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unsigned char irqs = UART_IER_RLSI | UART_IER_RDI; |
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up->ier &= ~irqs; |
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if (!throttle) |
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up->ier |= irqs; |
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serial_out(up, UART_IER, up->ier); |
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} |
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static void aspeed_vuart_set_throttle(struct uart_port *port, bool throttle) |
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{ |
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struct uart_8250_port *up = up_to_u8250p(port); |
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unsigned long flags; |
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spin_lock_irqsave(&port->lock, flags); |
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__aspeed_vuart_set_throttle(up, throttle); |
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spin_unlock_irqrestore(&port->lock, flags); |
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} |
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static void aspeed_vuart_throttle(struct uart_port *port) |
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{ |
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aspeed_vuart_set_throttle(port, true); |
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} |
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static void aspeed_vuart_unthrottle(struct uart_port *port) |
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{ |
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aspeed_vuart_set_throttle(port, false); |
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} |
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static void aspeed_vuart_unthrottle_exp(struct timer_list *timer) |
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{ |
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struct aspeed_vuart *vuart = from_timer(vuart, timer, unthrottle_timer); |
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struct uart_8250_port *up = vuart->port; |
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if (!tty_buffer_space_avail(&up->port.state->port)) { |
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mod_timer(&vuart->unthrottle_timer, |
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jiffies + unthrottle_timeout); |
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return; |
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} |
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aspeed_vuart_unthrottle(&up->port); |
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} |
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/* |
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* Custom interrupt handler to manage finer-grained flow control. Although we |
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* have throttle/unthrottle callbacks, we've seen that the VUART device can |
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* deliver characters faster than the ldisc has a chance to check buffer space |
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* against the throttle threshold. This results in dropped characters before |
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* the throttle. |
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* |
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* We do this by checking for flip buffer space before RX. If we have no space, |
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* throttle now and schedule an unthrottle for later, once the ldisc has had |
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* a chance to drain the buffers. |
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*/ |
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static int aspeed_vuart_handle_irq(struct uart_port *port) |
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{ |
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struct uart_8250_port *up = up_to_u8250p(port); |
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unsigned int iir, lsr; |
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unsigned long flags; |
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unsigned int space, count; |
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iir = serial_port_in(port, UART_IIR); |
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if (iir & UART_IIR_NO_INT) |
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return 0; |
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spin_lock_irqsave(&port->lock, flags); |
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lsr = serial_port_in(port, UART_LSR); |
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if (lsr & (UART_LSR_DR | UART_LSR_BI)) { |
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space = tty_buffer_space_avail(&port->state->port); |
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if (!space) { |
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/* throttle and schedule an unthrottle later */ |
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struct aspeed_vuart *vuart = port->private_data; |
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__aspeed_vuart_set_throttle(up, true); |
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if (!timer_pending(&vuart->unthrottle_timer)) |
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mod_timer(&vuart->unthrottle_timer, |
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jiffies + unthrottle_timeout); |
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} else { |
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count = min(space, 256U); |
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do { |
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serial8250_read_char(up, lsr); |
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lsr = serial_in(up, UART_LSR); |
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if (--count == 0) |
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break; |
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} while (lsr & (UART_LSR_DR | UART_LSR_BI)); |
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tty_flip_buffer_push(&port->state->port); |
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} |
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} |
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serial8250_modem_status(up); |
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if (lsr & UART_LSR_THRE) |
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serial8250_tx_chars(up); |
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uart_unlock_and_check_sysrq_irqrestore(port, flags); |
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return 1; |
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} |
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static void aspeed_vuart_auto_configure_sirq_polarity( |
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struct aspeed_vuart *vuart, struct device_node *syscon_np, |
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u32 reg_offset, u32 reg_mask) |
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{ |
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struct regmap *regmap; |
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u32 value; |
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regmap = syscon_node_to_regmap(syscon_np); |
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if (IS_ERR(regmap)) { |
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dev_warn(vuart->dev, |
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"could not get regmap for aspeed,sirq-polarity-sense\n"); |
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return; |
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} |
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if (regmap_read(regmap, reg_offset, &value)) { |
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dev_warn(vuart->dev, "could not read hw strap table\n"); |
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return; |
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} |
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aspeed_vuart_set_sirq_polarity(vuart, (value & reg_mask) == 0); |
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} |
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static int aspeed_vuart_map_irq_polarity(u32 dt) |
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{ |
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switch (dt) { |
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case IRQ_TYPE_LEVEL_LOW: |
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return 0; |
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case IRQ_TYPE_LEVEL_HIGH: |
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return 1; |
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default: |
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return -EINVAL; |
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} |
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} |
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static int aspeed_vuart_probe(struct platform_device *pdev) |
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{ |
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struct of_phandle_args sirq_polarity_sense_args; |
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struct uart_8250_port port; |
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struct aspeed_vuart *vuart; |
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struct device_node *np; |
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struct resource *res; |
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u32 clk, prop, sirq[2]; |
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int rc, sirq_polarity; |
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np = pdev->dev.of_node; |
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vuart = devm_kzalloc(&pdev->dev, sizeof(*vuart), GFP_KERNEL); |
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if (!vuart) |
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return -ENOMEM; |
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vuart->dev = &pdev->dev; |
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timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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memset(&port, 0, sizeof(port)); |
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port.port.private_data = vuart; |
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port.port.mapbase = res->start; |
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port.port.mapsize = resource_size(res); |
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port.port.startup = aspeed_vuart_startup; |
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port.port.shutdown = aspeed_vuart_shutdown; |
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port.port.throttle = aspeed_vuart_throttle; |
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port.port.unthrottle = aspeed_vuart_unthrottle; |
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port.port.status = UPSTAT_SYNC_FIFO; |
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port.port.dev = &pdev->dev; |
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port.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE); |
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port.bugs |= UART_BUG_TXRACE; |
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rc = sysfs_create_group(&vuart->dev->kobj, &aspeed_vuart_attr_group); |
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if (rc < 0) |
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return rc; |
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if (of_property_read_u32(np, "clock-frequency", &clk)) { |
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vuart->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(vuart->clk)) { |
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dev_warn(&pdev->dev, |
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"clk or clock-frequency not defined\n"); |
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rc = PTR_ERR(vuart->clk); |
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goto err_sysfs_remove; |
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} |
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rc = clk_prepare_enable(vuart->clk); |
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if (rc < 0) |
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goto err_sysfs_remove; |
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clk = clk_get_rate(vuart->clk); |
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} |
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/* If current-speed was set, then try not to change it. */ |
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if (of_property_read_u32(np, "current-speed", &prop) == 0) |
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port.port.custom_divisor = clk / (16 * prop); |
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|
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/* Check for shifted address mapping */ |
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if (of_property_read_u32(np, "reg-offset", &prop) == 0) |
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port.port.mapbase += prop; |
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|
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/* Check for registers offset within the devices address range */ |
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if (of_property_read_u32(np, "reg-shift", &prop) == 0) |
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port.port.regshift = prop; |
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/* Check for fifo size */ |
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if (of_property_read_u32(np, "fifo-size", &prop) == 0) |
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port.port.fifosize = prop; |
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|
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/* Check for a fixed line number */ |
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rc = of_alias_get_id(np, "serial"); |
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if (rc >= 0) |
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port.port.line = rc; |
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port.port.irq = irq_of_parse_and_map(np, 0); |
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port.port.handle_irq = aspeed_vuart_handle_irq; |
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port.port.iotype = UPIO_MEM; |
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port.port.type = PORT_16550A; |
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port.port.uartclk = clk; |
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port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP |
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| UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST; |
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if (of_property_read_bool(np, "no-loopback-test")) |
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port.port.flags |= UPF_SKIP_TEST; |
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if (port.port.fifosize) |
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port.capabilities = UART_CAP_FIFO; |
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if (of_property_read_bool(np, "auto-flow-control")) |
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port.capabilities |= UART_CAP_AFE; |
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rc = serial8250_register_8250_port(&port); |
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if (rc < 0) |
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goto err_clk_disable; |
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vuart->line = rc; |
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vuart->port = serial8250_get_port(vuart->line); |
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|
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rc = of_parse_phandle_with_fixed_args( |
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np, "aspeed,sirq-polarity-sense", 2, 0, |
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&sirq_polarity_sense_args); |
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if (rc < 0) { |
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dev_dbg(&pdev->dev, |
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"aspeed,sirq-polarity-sense property not found\n"); |
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} else { |
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aspeed_vuart_auto_configure_sirq_polarity( |
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vuart, sirq_polarity_sense_args.np, |
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sirq_polarity_sense_args.args[0], |
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BIT(sirq_polarity_sense_args.args[1])); |
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of_node_put(sirq_polarity_sense_args.np); |
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} |
|
|
|
rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &prop); |
|
if (rc < 0) |
|
prop = ASPEED_VUART_DEFAULT_LPC_ADDR; |
|
|
|
rc = aspeed_vuart_set_lpc_address(vuart, prop); |
|
if (rc < 0) { |
|
dev_err(&pdev->dev, "invalid value in aspeed,lpc-io-reg property\n"); |
|
goto err_clk_disable; |
|
} |
|
|
|
rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2); |
|
if (rc < 0) { |
|
sirq[0] = ASPEED_VUART_DEFAULT_SIRQ; |
|
sirq[1] = ASPEED_VUART_DEFAULT_SIRQ_POLARITY; |
|
} |
|
|
|
rc = aspeed_vuart_set_sirq(vuart, sirq[0]); |
|
if (rc < 0) { |
|
dev_err(&pdev->dev, "invalid sirq number in aspeed,lpc-interrupts property\n"); |
|
goto err_clk_disable; |
|
} |
|
|
|
sirq_polarity = aspeed_vuart_map_irq_polarity(sirq[1]); |
|
if (sirq_polarity < 0) { |
|
dev_err(&pdev->dev, "invalid sirq polarity in aspeed,lpc-interrupts property\n"); |
|
rc = sirq_polarity; |
|
goto err_clk_disable; |
|
} |
|
|
|
aspeed_vuart_set_sirq_polarity(vuart, sirq_polarity); |
|
|
|
aspeed_vuart_set_enabled(vuart, true); |
|
aspeed_vuart_set_host_tx_discard(vuart, true); |
|
platform_set_drvdata(pdev, vuart); |
|
|
|
return 0; |
|
|
|
err_clk_disable: |
|
clk_disable_unprepare(vuart->clk); |
|
irq_dispose_mapping(port.port.irq); |
|
err_sysfs_remove: |
|
sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group); |
|
return rc; |
|
} |
|
|
|
static int aspeed_vuart_remove(struct platform_device *pdev) |
|
{ |
|
struct aspeed_vuart *vuart = platform_get_drvdata(pdev); |
|
|
|
del_timer_sync(&vuart->unthrottle_timer); |
|
aspeed_vuart_set_enabled(vuart, false); |
|
serial8250_unregister_port(vuart->line); |
|
sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group); |
|
clk_disable_unprepare(vuart->clk); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id aspeed_vuart_table[] = { |
|
{ .compatible = "aspeed,ast2400-vuart" }, |
|
{ .compatible = "aspeed,ast2500-vuart" }, |
|
{ }, |
|
}; |
|
|
|
static struct platform_driver aspeed_vuart_driver = { |
|
.driver = { |
|
.name = "aspeed-vuart", |
|
.of_match_table = aspeed_vuart_table, |
|
}, |
|
.probe = aspeed_vuart_probe, |
|
.remove = aspeed_vuart_remove, |
|
}; |
|
|
|
module_platform_driver(aspeed_vuart_driver); |
|
|
|
MODULE_AUTHOR("Jeremy Kerr <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("Driver for Aspeed VUART device");
|
|
|