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Tony Lindgrenf577ffd2005-07-10 19:58:12 +01001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * linux/arch/arm/mach-omap1/serial.c
Tony Lindgrenf577ffd2005-07-10 19:58:12 +01003 *
Marek Vašut65d873c2006-12-06 17:13:56 -08004 * OMAP1 serial support.
Tony Lindgrenf577ffd2005-07-10 19:58:12 +01005 *
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.
9 */
10
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010011#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
Thomas Gleixnerd533c122006-07-01 22:32:35 +010014#include <linux/irq.h>
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010015#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>
Russell Kingf8ce2542006-01-07 16:15:52 +000020#include <linux/clk.h>
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010021
22#include <asm/io.h>
23#include <asm/mach-types.h>
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010024
25#include <asm/arch/board.h>
26#include <asm/arch/mux.h>
Tony Lindgren7c38cf02005-09-08 23:07:38 +010027#include <asm/arch/gpio.h>
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010028#include <asm/arch/fpga.h>
Tony Lindgren7c38cf02005-09-08 23:07:38 +010029#ifdef CONFIG_PM
30#include <asm/arch/pm.h>
31#endif
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010032
Tony Lindgren120db2c2006-04-02 17:46:27 +010033static struct clk * uart1_ck;
34static struct clk * uart2_ck;
35static struct clk * uart3_ck;
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010036
37static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
38 int offset)
39{
40 offset <<= up->regshift;
41 return (unsigned int)__raw_readb(up->membase + offset);
42}
43
44static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
45 int value)
46{
47 offset <<= p->regshift;
48 __raw_writeb(value, p->membase + offset);
49}
50
51/*
52 * Internal UARTs need to be initialized for the 8250 autoconfig to work
53 * properly. Note that the TX watermark initialization may not be needed
54 * once the 8250.c watermark handling code is merged.
55 */
56static void __init omap_serial_reset(struct plat_serial8250_port *p)
57{
58 omap_serial_outp(p, UART_OMAP_MDR1, 0x07); /* disable UART */
59 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
60 omap_serial_outp(p, UART_OMAP_MDR1, 0x00); /* enable UART */
61
Marek Vašut65d873c2006-12-06 17:13:56 -080062 if (!cpu_is_omap15xx()) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +010063 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
64 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
65 }
66}
67
68static struct plat_serial8250_port serial_platform_data[] = {
69 {
70 .membase = (char*)IO_ADDRESS(OMAP_UART1_BASE),
71 .mapbase = (unsigned long)OMAP_UART1_BASE,
72 .irq = INT_UART1,
73 .flags = UPF_BOOT_AUTOCONF,
74 .iotype = UPIO_MEM,
75 .regshift = 2,
76 .uartclk = OMAP16XX_BASE_BAUD * 16,
77 },
78 {
79 .membase = (char*)IO_ADDRESS(OMAP_UART2_BASE),
80 .mapbase = (unsigned long)OMAP_UART2_BASE,
81 .irq = INT_UART2,
82 .flags = UPF_BOOT_AUTOCONF,
83 .iotype = UPIO_MEM,
84 .regshift = 2,
85 .uartclk = OMAP16XX_BASE_BAUD * 16,
86 },
87 {
88 .membase = (char*)IO_ADDRESS(OMAP_UART3_BASE),
89 .mapbase = (unsigned long)OMAP_UART3_BASE,
90 .irq = INT_UART3,
91 .flags = UPF_BOOT_AUTOCONF,
92 .iotype = UPIO_MEM,
93 .regshift = 2,
94 .uartclk = OMAP16XX_BASE_BAUD * 16,
95 },
96 { },
97};
98
99static struct platform_device serial_device = {
100 .name = "serial8250",
Russell King6df29de2005-09-08 16:04:41 +0100101 .id = PLAT8250_DEV_PLATFORM,
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100102 .dev = {
103 .platform_data = serial_platform_data,
104 },
105};
106
107/*
108 * Note that on Innovator-1510 UART2 pins conflict with USB2.
109 * By default UART2 does not work on Innovator-1510 if you have
110 * USB OHCI enabled. To use UART2, you must disable USB2 first.
111 */
Tony Lindgren3179a012005-11-10 14:26:48 +0000112void __init omap_serial_init(void)
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100113{
114 int i;
Tony Lindgren3179a012005-11-10 14:26:48 +0000115 const struct omap_uart_config *info;
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100116
117 if (cpu_is_omap730()) {
118 serial_platform_data[0].regshift = 0;
119 serial_platform_data[1].regshift = 0;
120 serial_platform_data[0].irq = INT_730_UART_MODEM_1;
121 serial_platform_data[1].irq = INT_730_UART_MODEM_IRDA_2;
122 }
123
Marek Vašut65d873c2006-12-06 17:13:56 -0800124 if (cpu_is_omap15xx()) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100125 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
126 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
127 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
128 }
129
Tony Lindgren3179a012005-11-10 14:26:48 +0000130 info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
131 if (info == NULL)
132 return;
133
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100134 for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
135 unsigned char reg;
136
Tony Lindgren3179a012005-11-10 14:26:48 +0000137 if (!((1 << i) & info->enabled_uarts)) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100138 serial_platform_data[i].membase = NULL;
139 serial_platform_data[i].mapbase = 0;
140 continue;
141 }
142
143 switch (i) {
144 case 0:
145 uart1_ck = clk_get(NULL, "uart1_ck");
146 if (IS_ERR(uart1_ck))
147 printk("Could not get uart1_ck\n");
148 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800149 clk_enable(uart1_ck);
Marek Vašut65d873c2006-12-06 17:13:56 -0800150 if (cpu_is_omap15xx())
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100151 clk_set_rate(uart1_ck, 12000000);
152 }
Marek Vašut65d873c2006-12-06 17:13:56 -0800153 if (cpu_is_omap15xx()) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100154 omap_cfg_reg(UART1_TX);
155 omap_cfg_reg(UART1_RTS);
156 if (machine_is_omap_innovator()) {
157 reg = fpga_read(OMAP1510_FPGA_POWER);
158 reg |= OMAP1510_FPGA_PCR_COM1_EN;
159 fpga_write(reg, OMAP1510_FPGA_POWER);
160 udelay(10);
161 }
162 }
163 break;
164 case 1:
165 uart2_ck = clk_get(NULL, "uart2_ck");
166 if (IS_ERR(uart2_ck))
167 printk("Could not get uart2_ck\n");
168 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800169 clk_enable(uart2_ck);
Marek Vašut65d873c2006-12-06 17:13:56 -0800170 if (cpu_is_omap15xx())
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100171 clk_set_rate(uart2_ck, 12000000);
172 else
173 clk_set_rate(uart2_ck, 48000000);
174 }
Marek Vašut65d873c2006-12-06 17:13:56 -0800175 if (cpu_is_omap15xx()) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100176 omap_cfg_reg(UART2_TX);
177 omap_cfg_reg(UART2_RTS);
178 if (machine_is_omap_innovator()) {
179 reg = fpga_read(OMAP1510_FPGA_POWER);
180 reg |= OMAP1510_FPGA_PCR_COM2_EN;
181 fpga_write(reg, OMAP1510_FPGA_POWER);
182 udelay(10);
183 }
184 }
185 break;
186 case 2:
187 uart3_ck = clk_get(NULL, "uart3_ck");
188 if (IS_ERR(uart3_ck))
189 printk("Could not get uart3_ck\n");
190 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800191 clk_enable(uart3_ck);
Marek Vašut65d873c2006-12-06 17:13:56 -0800192 if (cpu_is_omap15xx())
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100193 clk_set_rate(uart3_ck, 12000000);
194 }
Marek Vašut65d873c2006-12-06 17:13:56 -0800195 if (cpu_is_omap15xx()) {
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100196 omap_cfg_reg(UART3_TX);
197 omap_cfg_reg(UART3_RX);
198 }
199 break;
200 }
201 omap_serial_reset(&serial_platform_data[i]);
202 }
203}
204
Tony Lindgren7c38cf02005-09-08 23:07:38 +0100205#ifdef CONFIG_OMAP_SERIAL_WAKE
206
Linus Torvalds0cd61b62006-10-06 10:53:39 -0700207static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
Tony Lindgren7c38cf02005-09-08 23:07:38 +0100208{
209 /* Need to do something with serial port right after wake-up? */
210 return IRQ_HANDLED;
211}
212
213/*
214 * Reroutes serial RX lines to GPIO lines for the duration of
215 * sleep to allow waking up the device from serial port even
216 * in deep sleep.
217 */
218void omap_serial_wake_trigger(int enable)
219{
220 if (!cpu_is_omap16xx())
221 return;
222
223 if (uart1_ck != NULL) {
224 if (enable)
225 omap_cfg_reg(V14_16XX_GPIO37);
226 else
227 omap_cfg_reg(V14_16XX_UART1_RX);
228 }
229 if (uart2_ck != NULL) {
230 if (enable)
231 omap_cfg_reg(R9_16XX_GPIO18);
232 else
233 omap_cfg_reg(R9_16XX_UART2_RX);
234 }
235 if (uart3_ck != NULL) {
236 if (enable)
237 omap_cfg_reg(L14_16XX_GPIO49);
238 else
239 omap_cfg_reg(L14_16XX_UART3_RX);
240 }
241}
242
243static void __init omap_serial_set_port_wakeup(int gpio_nr)
244{
245 int ret;
246
247 ret = omap_request_gpio(gpio_nr);
248 if (ret < 0) {
249 printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
250 gpio_nr);
251 return;
252 }
253 omap_set_gpio_direction(gpio_nr, 1);
Tony Lindgren7c38cf02005-09-08 23:07:38 +0100254 ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt,
Thomas Gleixner52e405e2006-07-03 02:20:05 +0200255 IRQF_TRIGGER_RISING, "serial wakeup", NULL);
Tony Lindgren7c38cf02005-09-08 23:07:38 +0100256 if (ret) {
257 omap_free_gpio(gpio_nr);
258 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
259 gpio_nr);
260 return;
261 }
262 enable_irq_wake(OMAP_GPIO_IRQ(gpio_nr));
263}
264
265static int __init omap_serial_wakeup_init(void)
266{
267 if (!cpu_is_omap16xx())
268 return 0;
269
270 if (uart1_ck != NULL)
271 omap_serial_set_port_wakeup(37);
272 if (uart2_ck != NULL)
273 omap_serial_set_port_wakeup(18);
274 if (uart3_ck != NULL)
275 omap_serial_set_port_wakeup(49);
276
277 return 0;
278}
279late_initcall(omap_serial_wakeup_init);
280
281#endif /* CONFIG_OMAP_SERIAL_WAKE */
282
Tony Lindgrenf577ffd2005-07-10 19:58:12 +0100283static int __init omap_init(void)
284{
285 return platform_device_register(&serial_device);
286}
287arch_initcall(omap_init);