2 * linux/arch/arm/mach-omap1/serial.c
4 * OMAP1 serial support.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
15 #include <linux/delay.h>
16 #include <linux/serial.h>
17 #include <linux/tty.h>
18 #include <linux/serial_8250.h>
19 #include <linux/serial_reg.h>
20 #include <linux/clk.h>
23 #include <asm/mach-types.h>
25 #include <mach/board.h>
27 #include <mach/gpio.h>
28 #include <mach/fpga.h>
30 static struct clk
* uart1_ck
;
31 static struct clk
* uart2_ck
;
32 static struct clk
* uart3_ck
;
34 static inline unsigned int omap_serial_in(struct plat_serial8250_port
*up
,
37 offset
<<= up
->regshift
;
38 return (unsigned int)__raw_readb(up
->membase
+ offset
);
41 static inline void omap_serial_outp(struct plat_serial8250_port
*p
, int offset
,
44 offset
<<= p
->regshift
;
45 __raw_writeb(value
, p
->membase
+ offset
);
49 * Internal UARTs need to be initialized for the 8250 autoconfig to work
50 * properly. Note that the TX watermark initialization may not be needed
51 * once the 8250.c watermark handling code is merged.
53 static void __init
omap_serial_reset(struct plat_serial8250_port
*p
)
55 omap_serial_outp(p
, UART_OMAP_MDR1
, 0x07); /* disable UART */
56 omap_serial_outp(p
, UART_OMAP_SCR
, 0x08); /* TX watermark */
57 omap_serial_outp(p
, UART_OMAP_MDR1
, 0x00); /* enable UART */
59 if (!cpu_is_omap15xx()) {
60 omap_serial_outp(p
, UART_OMAP_SYSC
, 0x01);
61 while (!(omap_serial_in(p
, UART_OMAP_SYSC
) & 0x01));
65 static struct plat_serial8250_port serial_platform_data
[] = {
67 .membase
= OMAP1_IO_ADDRESS(OMAP_UART1_BASE
),
68 .mapbase
= OMAP_UART1_BASE
,
70 .flags
= UPF_BOOT_AUTOCONF
,
73 .uartclk
= OMAP16XX_BASE_BAUD
* 16,
76 .membase
= OMAP1_IO_ADDRESS(OMAP_UART2_BASE
),
77 .mapbase
= OMAP_UART2_BASE
,
79 .flags
= UPF_BOOT_AUTOCONF
,
82 .uartclk
= OMAP16XX_BASE_BAUD
* 16,
85 .membase
= OMAP1_IO_ADDRESS(OMAP_UART3_BASE
),
86 .mapbase
= OMAP_UART3_BASE
,
88 .flags
= UPF_BOOT_AUTOCONF
,
91 .uartclk
= OMAP16XX_BASE_BAUD
* 16,
96 static struct platform_device serial_device
= {
98 .id
= PLAT8250_DEV_PLATFORM
,
100 .platform_data
= serial_platform_data
,
105 * Note that on Innovator-1510 UART2 pins conflict with USB2.
106 * By default UART2 does not work on Innovator-1510 if you have
107 * USB OHCI enabled. To use UART2, you must disable USB2 first.
109 void __init
omap_serial_init(void)
113 if (cpu_is_omap730()) {
114 serial_platform_data
[0].regshift
= 0;
115 serial_platform_data
[1].regshift
= 0;
116 serial_platform_data
[0].irq
= INT_730_UART_MODEM_1
;
117 serial_platform_data
[1].irq
= INT_730_UART_MODEM_IRDA_2
;
120 if (cpu_is_omap850()) {
121 serial_platform_data
[0].regshift
= 0;
122 serial_platform_data
[1].regshift
= 0;
123 serial_platform_data
[0].irq
= INT_850_UART_MODEM_1
;
124 serial_platform_data
[1].irq
= INT_850_UART_MODEM_IRDA_2
;
127 if (cpu_is_omap15xx()) {
128 serial_platform_data
[0].uartclk
= OMAP1510_BASE_BAUD
* 16;
129 serial_platform_data
[1].uartclk
= OMAP1510_BASE_BAUD
* 16;
130 serial_platform_data
[2].uartclk
= OMAP1510_BASE_BAUD
* 16;
133 for (i
= 0; i
< OMAP_MAX_NR_PORTS
; i
++) {
138 uart1_ck
= clk_get(NULL
, "uart1_ck");
139 if (IS_ERR(uart1_ck
))
140 printk("Could not get uart1_ck\n");
142 clk_enable(uart1_ck
);
143 if (cpu_is_omap15xx())
144 clk_set_rate(uart1_ck
, 12000000);
146 if (cpu_is_omap15xx()) {
147 omap_cfg_reg(UART1_TX
);
148 omap_cfg_reg(UART1_RTS
);
149 if (machine_is_omap_innovator()) {
150 reg
= fpga_read(OMAP1510_FPGA_POWER
);
151 reg
|= OMAP1510_FPGA_PCR_COM1_EN
;
152 fpga_write(reg
, OMAP1510_FPGA_POWER
);
158 uart2_ck
= clk_get(NULL
, "uart2_ck");
159 if (IS_ERR(uart2_ck
))
160 printk("Could not get uart2_ck\n");
162 clk_enable(uart2_ck
);
163 if (cpu_is_omap15xx())
164 clk_set_rate(uart2_ck
, 12000000);
166 clk_set_rate(uart2_ck
, 48000000);
168 if (cpu_is_omap15xx()) {
169 omap_cfg_reg(UART2_TX
);
170 omap_cfg_reg(UART2_RTS
);
171 if (machine_is_omap_innovator()) {
172 reg
= fpga_read(OMAP1510_FPGA_POWER
);
173 reg
|= OMAP1510_FPGA_PCR_COM2_EN
;
174 fpga_write(reg
, OMAP1510_FPGA_POWER
);
180 uart3_ck
= clk_get(NULL
, "uart3_ck");
181 if (IS_ERR(uart3_ck
))
182 printk("Could not get uart3_ck\n");
184 clk_enable(uart3_ck
);
185 if (cpu_is_omap15xx())
186 clk_set_rate(uart3_ck
, 12000000);
188 if (cpu_is_omap15xx()) {
189 omap_cfg_reg(UART3_TX
);
190 omap_cfg_reg(UART3_RX
);
194 omap_serial_reset(&serial_platform_data
[i
]);
198 #ifdef CONFIG_OMAP_SERIAL_WAKE
200 static irqreturn_t
omap_serial_wake_interrupt(int irq
, void *dev_id
)
202 /* Need to do something with serial port right after wake-up? */
207 * Reroutes serial RX lines to GPIO lines for the duration of
208 * sleep to allow waking up the device from serial port even
211 void omap_serial_wake_trigger(int enable
)
213 if (!cpu_is_omap16xx())
216 if (uart1_ck
!= NULL
) {
218 omap_cfg_reg(V14_16XX_GPIO37
);
220 omap_cfg_reg(V14_16XX_UART1_RX
);
222 if (uart2_ck
!= NULL
) {
224 omap_cfg_reg(R9_16XX_GPIO18
);
226 omap_cfg_reg(R9_16XX_UART2_RX
);
228 if (uart3_ck
!= NULL
) {
230 omap_cfg_reg(L14_16XX_GPIO49
);
232 omap_cfg_reg(L14_16XX_UART3_RX
);
236 static void __init
omap_serial_set_port_wakeup(int gpio_nr
)
240 ret
= gpio_request(gpio_nr
, "UART wake");
242 printk(KERN_ERR
"Could not request UART wake GPIO: %i\n",
246 gpio_direction_input(gpio_nr
);
247 ret
= request_irq(gpio_to_irq(gpio_nr
), &omap_serial_wake_interrupt
,
248 IRQF_TRIGGER_RISING
, "serial wakeup", NULL
);
251 printk(KERN_ERR
"No interrupt for UART wake GPIO: %i\n",
255 enable_irq_wake(gpio_to_irq(gpio_nr
));
258 static int __init
omap_serial_wakeup_init(void)
260 if (!cpu_is_omap16xx())
263 if (uart1_ck
!= NULL
)
264 omap_serial_set_port_wakeup(37);
265 if (uart2_ck
!= NULL
)
266 omap_serial_set_port_wakeup(18);
267 if (uart3_ck
!= NULL
)
268 omap_serial_set_port_wakeup(49);
272 late_initcall(omap_serial_wakeup_init
);
274 #endif /* CONFIG_OMAP_SERIAL_WAKE */
276 static int __init
omap_init(void)
278 return platform_device_register(&serial_device
);
280 arch_initcall(omap_init
);