diff options
Diffstat (limited to 'arch/arm/mach-lpc32xx/serial.c')
| -rw-r--r-- | arch/arm/mach-lpc32xx/serial.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/arch/arm/mach-lpc32xx/serial.c b/arch/arm/mach-lpc32xx/serial.c new file mode 100644 index 00000000000..429cfdbb2b3 --- /dev/null +++ b/arch/arm/mach-lpc32xx/serial.c @@ -0,0 +1,190 @@ +/* + * arch/arm/mach-lpc32xx/serial.c + * + * Author: Kevin Wells <kevin.wells@nxp.com> + * + * Copyright (C) 2010 NXP Semiconductors + * + * 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 + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/serial.h> +#include <linux/serial_core.h> +#include <linux/serial_reg.h> +#include <linux/serial_8250.h> +#include <linux/clk.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <mach/platform.h> +#include "common.h" + +#define LPC32XX_SUART_FIFO_SIZE 64 + +/* Standard 8250/16550 compatible serial ports */ +static struct plat_serial8250_port serial_std_platform_data[] = { +#ifdef CONFIG_ARCH_LPC32XX_UART5_SELECT + { + .membase = io_p2v(LPC32XX_UART5_BASE), + .mapbase = LPC32XX_UART5_BASE, + .irq = IRQ_LPC32XX_UART_IIR5, + .uartclk = LPC32XX_MAIN_OSC_FREQ, + .regshift = 2, + .iotype = UPIO_MEM32, + .flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART | + UPF_SKIP_TEST, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART3_SELECT + { + .membase = io_p2v(LPC32XX_UART3_BASE), + .mapbase = LPC32XX_UART3_BASE, + .irq = IRQ_LPC32XX_UART_IIR3, + .uartclk = LPC32XX_MAIN_OSC_FREQ, + .regshift = 2, + .iotype = UPIO_MEM32, + .flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART | + UPF_SKIP_TEST, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART4_SELECT + { + .membase = io_p2v(LPC32XX_UART4_BASE), + .mapbase = LPC32XX_UART4_BASE, + .irq = IRQ_LPC32XX_UART_IIR4, + .uartclk = LPC32XX_MAIN_OSC_FREQ, + .regshift = 2, + .iotype = UPIO_MEM32, + .flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART | + UPF_SKIP_TEST, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART6_SELECT + { + .membase = io_p2v(LPC32XX_UART6_BASE), + .mapbase = LPC32XX_UART6_BASE, + .irq = IRQ_LPC32XX_UART_IIR6, + .uartclk = LPC32XX_MAIN_OSC_FREQ, + .regshift = 2, + .iotype = UPIO_MEM32, + .flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART | + UPF_SKIP_TEST, + }, +#endif + { }, +}; + +struct uartinit { + char *uart_ck_name; + u32 ck_mode_mask; + void __iomem *pdiv_clk_reg; +}; + +static struct uartinit uartinit_data[] __initdata = { +#ifdef CONFIG_ARCH_LPC32XX_UART5_SELECT + { + .uart_ck_name = "uart5_ck", + .ck_mode_mask = + LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 5), + .pdiv_clk_reg = LPC32XX_CLKPWR_UART5_CLK_CTRL, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART3_SELECT + { + .uart_ck_name = "uart3_ck", + .ck_mode_mask = + LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 3), + .pdiv_clk_reg = LPC32XX_CLKPWR_UART3_CLK_CTRL, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART4_SELECT + { + .uart_ck_name = "uart4_ck", + .ck_mode_mask = + LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 4), + .pdiv_clk_reg = LPC32XX_CLKPWR_UART4_CLK_CTRL, + }, +#endif +#ifdef CONFIG_ARCH_LPC32XX_UART6_SELECT + { + .uart_ck_name = "uart6_ck", + .ck_mode_mask = + LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 6), + .pdiv_clk_reg = LPC32XX_CLKPWR_UART6_CLK_CTRL, + }, +#endif +}; + +static struct platform_device serial_std_platform_device = { + .name = "serial8250", + .id = 0, + .dev = { + .platform_data = serial_std_platform_data, + }, +}; + +static struct platform_device *lpc32xx_serial_devs[] __initdata = { + &serial_std_platform_device, +}; + +void __init lpc32xx_serial_init(void) +{ + u32 tmp, clkmodes = 0; + struct clk *clk; + unsigned int puart; + int i, j; + + /* UART clocks are off, let clock driver manage them */ + __raw_writel(0, LPC32XX_CLKPWR_UART_CLK_CTRL); + + for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) { + clk = clk_get(NULL, uartinit_data[i].uart_ck_name); + if (!IS_ERR(clk)) { + clk_enable(clk); + serial_std_platform_data[i].uartclk = + clk_get_rate(clk); + } + + /* Fall back on main osc rate if clock rate return fails */ + if (serial_std_platform_data[i].uartclk == 0) + serial_std_platform_data[i].uartclk = + LPC32XX_MAIN_OSC_FREQ; + + /* Setup UART clock modes for all UARTs, disable autoclock */ + clkmodes |= uartinit_data[i].ck_mode_mask; + + /* pre-UART clock divider set to 1 */ + __raw_writel(0x0101, uartinit_data[i].pdiv_clk_reg); + } + + /* This needs to be done after all UART clocks are setup */ + __raw_writel(clkmodes, LPC32XX_UARTCTL_CLKMODE); + for (i = 0; i < ARRAY_SIZE(uartinit_data) - 1; i++) { + /* Force a flush of the RX FIFOs to work around a HW bug */ + puart = serial_std_platform_data[i].mapbase; + __raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart)); + __raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart)); + j = LPC32XX_SUART_FIFO_SIZE; + while (j--) + tmp = __raw_readl(LPC32XX_UART_DLL_FIFO(puart)); + __raw_writel(0, LPC32XX_UART_IIR_FCR(puart)); + } + + /* Disable UART5->USB transparent mode or USB won't work */ + tmp = __raw_readl(LPC32XX_UARTCTL_CTRL); + tmp &= ~LPC32XX_UART_U5_ROUTE_TO_USB; + __raw_writel(tmp, LPC32XX_UARTCTL_CTRL); + + platform_add_devices(lpc32xx_serial_devs, + ARRAY_SIZE(lpc32xx_serial_devs)); +} |