1 /* 2 * linux/arch/arm/mach-omap1/serial.c 3 * 4 * OMAP1 serial support. 5 * 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 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> 21 #include <linux/io.h> 22 23 #include <asm/mach-types.h> 24 25 #include <plat/board.h> 26 #include <plat/mux.h> 27 #include <mach/gpio.h> 28 #include <plat/fpga.h> 29 30 #include "pm.h" 31 32 static struct clk * uart1_ck; 33 static struct clk * uart2_ck; 34 static struct clk * uart3_ck; 35 36 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, 37 int offset) 38 { 39 offset <<= up->regshift; 40 return (unsigned int)__raw_readb(up->membase + offset); 41 } 42 43 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, 44 int value) 45 { 46 offset <<= p->regshift; 47 __raw_writeb(value, p->membase + offset); 48 } 49 50 /* 51 * Internal UARTs need to be initialized for the 8250 autoconfig to work 52 * properly. Note that the TX watermark initialization may not be needed 53 * once the 8250.c watermark handling code is merged. 54 */ 55 static void __init omap_serial_reset(struct plat_serial8250_port *p) 56 { 57 omap_serial_outp(p, UART_OMAP_MDR1, 58 UART_OMAP_MDR1_DISABLE); /* disable UART */ 59 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ 60 omap_serial_outp(p, UART_OMAP_MDR1, 61 UART_OMAP_MDR1_16X_MODE); /* enable UART */ 62 63 if (!cpu_is_omap15xx()) { 64 omap_serial_outp(p, UART_OMAP_SYSC, 0x01); 65 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); 66 } 67 } 68 69 static struct plat_serial8250_port serial_platform_data[] = { 70 { 71 .mapbase = OMAP1_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 .mapbase = OMAP1_UART2_BASE, 80 .irq = INT_UART2, 81 .flags = UPF_BOOT_AUTOCONF, 82 .iotype = UPIO_MEM, 83 .regshift = 2, 84 .uartclk = OMAP16XX_BASE_BAUD * 16, 85 }, 86 { 87 .mapbase = OMAP1_UART3_BASE, 88 .irq = INT_UART3, 89 .flags = UPF_BOOT_AUTOCONF, 90 .iotype = UPIO_MEM, 91 .regshift = 2, 92 .uartclk = OMAP16XX_BASE_BAUD * 16, 93 }, 94 { }, 95 }; 96 97 static struct platform_device serial_device = { 98 .name = "serial8250", 99 .id = PLAT8250_DEV_PLATFORM, 100 .dev = { 101 .platform_data = serial_platform_data, 102 }, 103 }; 104 105 /* 106 * Note that on Innovator-1510 UART2 pins conflict with USB2. 107 * By default UART2 does not work on Innovator-1510 if you have 108 * USB OHCI enabled. To use UART2, you must disable USB2 first. 109 */ 110 void __init omap_serial_init(void) 111 { 112 int i; 113 114 if (cpu_is_omap7xx()) { 115 serial_platform_data[0].regshift = 0; 116 serial_platform_data[1].regshift = 0; 117 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1; 118 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2; 119 } 120 121 if (cpu_is_omap15xx()) { 122 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; 123 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; 124 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; 125 } 126 127 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) { 128 129 /* Don't look at UARTs higher than 2 for omap7xx */ 130 if (cpu_is_omap7xx() && i > 1) { 131 serial_platform_data[i].membase = NULL; 132 serial_platform_data[i].mapbase = 0; 133 continue; 134 } 135 136 /* Static mapping, never released */ 137 serial_platform_data[i].membase = 138 ioremap(serial_platform_data[i].mapbase, SZ_2K); 139 if (!serial_platform_data[i].membase) { 140 printk(KERN_ERR "Could not ioremap uart%i\n", i); 141 continue; 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 { 149 clk_enable(uart1_ck); 150 if (cpu_is_omap15xx()) 151 clk_set_rate(uart1_ck, 12000000); 152 } 153 break; 154 case 1: 155 uart2_ck = clk_get(NULL, "uart2_ck"); 156 if (IS_ERR(uart2_ck)) 157 printk("Could not get uart2_ck\n"); 158 else { 159 clk_enable(uart2_ck); 160 if (cpu_is_omap15xx()) 161 clk_set_rate(uart2_ck, 12000000); 162 else 163 clk_set_rate(uart2_ck, 48000000); 164 } 165 break; 166 case 2: 167 uart3_ck = clk_get(NULL, "uart3_ck"); 168 if (IS_ERR(uart3_ck)) 169 printk("Could not get uart3_ck\n"); 170 else { 171 clk_enable(uart3_ck); 172 if (cpu_is_omap15xx()) 173 clk_set_rate(uart3_ck, 12000000); 174 } 175 break; 176 } 177 omap_serial_reset(&serial_platform_data[i]); 178 } 179 } 180 181 #ifdef CONFIG_OMAP_SERIAL_WAKE 182 183 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) 184 { 185 /* Need to do something with serial port right after wake-up? */ 186 return IRQ_HANDLED; 187 } 188 189 /* 190 * Reroutes serial RX lines to GPIO lines for the duration of 191 * sleep to allow waking up the device from serial port even 192 * in deep sleep. 193 */ 194 void omap_serial_wake_trigger(int enable) 195 { 196 if (!cpu_is_omap16xx()) 197 return; 198 199 if (uart1_ck != NULL) { 200 if (enable) 201 omap_cfg_reg(V14_16XX_GPIO37); 202 else 203 omap_cfg_reg(V14_16XX_UART1_RX); 204 } 205 if (uart2_ck != NULL) { 206 if (enable) 207 omap_cfg_reg(R9_16XX_GPIO18); 208 else 209 omap_cfg_reg(R9_16XX_UART2_RX); 210 } 211 if (uart3_ck != NULL) { 212 if (enable) 213 omap_cfg_reg(L14_16XX_GPIO49); 214 else 215 omap_cfg_reg(L14_16XX_UART3_RX); 216 } 217 } 218 219 static void __init omap_serial_set_port_wakeup(int gpio_nr) 220 { 221 int ret; 222 223 ret = gpio_request(gpio_nr, "UART wake"); 224 if (ret < 0) { 225 printk(KERN_ERR "Could not request UART wake GPIO: %i\n", 226 gpio_nr); 227 return; 228 } 229 gpio_direction_input(gpio_nr); 230 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, 231 IRQF_TRIGGER_RISING, "serial wakeup", NULL); 232 if (ret) { 233 gpio_free(gpio_nr); 234 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", 235 gpio_nr); 236 return; 237 } 238 enable_irq_wake(gpio_to_irq(gpio_nr)); 239 } 240 241 static int __init omap_serial_wakeup_init(void) 242 { 243 if (!cpu_is_omap16xx()) 244 return 0; 245 246 if (uart1_ck != NULL) 247 omap_serial_set_port_wakeup(37); 248 if (uart2_ck != NULL) 249 omap_serial_set_port_wakeup(18); 250 if (uart3_ck != NULL) 251 omap_serial_set_port_wakeup(49); 252 253 return 0; 254 } 255 late_initcall(omap_serial_wakeup_init); 256 257 #endif /* CONFIG_OMAP_SERIAL_WAKE */ 258 259 static int __init omap_init(void) 260 { 261 if (!cpu_class_is_omap1()) 262 return -ENODEV; 263 264 return platform_device_register(&serial_device); 265 } 266 arch_initcall(omap_init); 267