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92 lines
2.1 KiB
92 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* TI DaVinci serial driver |
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* |
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* Copyright (C) 2006 Texas Instruments. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/serial_8250.h> |
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#include <linux/serial_reg.h> |
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#include <linux/platform_device.h> |
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#include <linux/delay.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <mach/serial.h> |
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#include <mach/cputype.h> |
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static inline void serial_write_reg(struct plat_serial8250_port *p, int offset, |
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int value) |
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{ |
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offset <<= p->regshift; |
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WARN_ONCE(!p->membase, "unmapped write: uart[%d]\n", offset); |
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__raw_writel(value, p->membase + offset); |
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} |
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static void __init davinci_serial_reset(struct plat_serial8250_port *p) |
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{ |
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unsigned int pwremu = 0; |
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serial_write_reg(p, UART_IER, 0); /* disable all interrupts */ |
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/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */ |
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu); |
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mdelay(10); |
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pwremu |= (0x3 << 13); |
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pwremu |= 0x1; |
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serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu); |
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if (cpu_is_davinci_dm646x()) |
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serial_write_reg(p, UART_DM646X_SCR, |
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UART_DM646X_SCR_TX_WATERMARK); |
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} |
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int __init davinci_serial_init(struct platform_device *serial_dev) |
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{ |
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int i, ret = 0; |
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struct device *dev; |
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struct plat_serial8250_port *p; |
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struct clk *clk; |
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/* |
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* Make sure the serial ports are muxed on at this point. |
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* You have to mux them off in device drivers later on if not needed. |
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*/ |
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for (i = 0; serial_dev[i].dev.platform_data != NULL; i++) { |
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dev = &serial_dev[i].dev; |
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p = dev->platform_data; |
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ret = platform_device_register(&serial_dev[i]); |
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if (ret) |
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continue; |
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clk = clk_get(dev, NULL); |
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if (IS_ERR(clk)) { |
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pr_err("%s:%d: failed to get UART%d clock\n", |
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__func__, __LINE__, i); |
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continue; |
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} |
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clk_prepare_enable(clk); |
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p->uartclk = clk_get_rate(clk); |
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if (!p->membase && p->mapbase) { |
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p->membase = ioremap(p->mapbase, SZ_4K); |
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if (p->membase) |
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p->flags &= ~UPF_IOREMAP; |
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else |
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pr_err("uart regs ioremap failed\n"); |
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} |
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if (p->membase && p->type != PORT_AR7) |
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davinci_serial_reset(p); |
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} |
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return ret; |
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}
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