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 #include <linux/gpio.h> 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 <plat/fpga.h> 28 29 #include "pm.h" 30 31 static struct clk * uart1_ck; 32 static struct clk * uart2_ck; 33 static struct clk * uart3_ck; 34 35 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, 36 int offset) 37 { 38 offset <<= up->regshift; 39 return (unsigned int)__raw_readb(up->membase + offset); 40 } 41 42 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, 43 int value) 44 { 45 offset <<= p->regshift; 46 __raw_writeb(value, p->membase + offset); 47 } 48 49 /* 50 * Internal UARTs need to be initialized for the 8250 autoconfig to work 51 * properly. Note that the TX watermark initialization may not be needed 52 * once the 8250.c watermark handling code is merged. 53 */ 54 static void __init omap_serial_reset(struct plat_serial8250_port *p) 55 { 56 omap_serial_outp(p, UART_OMAP_MDR1, 57 UART_OMAP_MDR1_DISABLE); /* disable UART */ 58 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ 59 omap_serial_outp(p, UART_OMAP_MDR1, 60 UART_OMAP_MDR1_16X_MODE); /* enable UART */ 61 62 if (!cpu_is_omap15xx()) { 63 omap_serial_outp(p, UART_OMAP_SYSC, 0x01); 64 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); 65 } 66 } 67 68 static struct plat_serial8250_port serial_platform_data[] = { 69 { 70 .mapbase = OMAP1_UART1_BASE, 71 .irq = INT_UART1, 72 .flags = UPF_BOOT_AUTOCONF, 73 .iotype = UPIO_MEM, 74 .regshift = 2, 75 .uartclk = OMAP16XX_BASE_BAUD * 16, 76 }, 77 { 78 .mapbase = OMAP1_UART2_BASE, 79 .irq = INT_UART2, 80 .flags = UPF_BOOT_AUTOCONF, 81 .iotype = UPIO_MEM, 82 .regshift = 2, 83 .uartclk = OMAP16XX_BASE_BAUD * 16, 84 }, 85 { 86 .mapbase = OMAP1_UART3_BASE, 87 .irq = INT_UART3, 88 .flags = UPF_BOOT_AUTOCONF, 89 .iotype = UPIO_MEM, 90 .regshift = 2, 91 .uartclk = OMAP16XX_BASE_BAUD * 16, 92 }, 93 { }, 94 }; 95 96 static struct platform_device serial_device = { 97 .name = "serial8250", 98 .id = PLAT8250_DEV_PLATFORM, 99 .dev = { 100 .platform_data = serial_platform_data, 101 }, 102 }; 103 104 /* 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. 108 */ 109 void __init omap_serial_init(void) 110 { 111 int i; 112 113 if (cpu_is_omap7xx()) { 114 serial_platform_data[0].regshift = 0; 115 serial_platform_data[1].regshift = 0; 116 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1; 117 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2; 118 } 119 120 if (cpu_is_omap15xx()) { 121 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; 122 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; 123 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; 124 } 125 126 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) { 127 128 /* Don't look at UARTs higher than 2 for omap7xx */ 129 if (cpu_is_omap7xx() && i > 1) { 130 serial_platform_data[i].membase = NULL; 131 serial_platform_data[i].mapbase = 0; 132 continue; 133 } 134 135 /* Static mapping, never released */ 136 serial_platform_data[i].membase = 137 ioremap(serial_platform_data[i].mapbase, SZ_2K); 138 if (!serial_platform_data[i].membase) { 139 printk(KERN_ERR "Could not ioremap uart%i\n", i); 140 continue; 141 } 142 switch (i) { 143 case 0: 144 uart1_ck = clk_get(NULL, "uart1_ck"); 145 if (IS_ERR(uart1_ck)) 146 printk("Could not get uart1_ck\n"); 147 else { 148 clk_enable(uart1_ck); 149 if (cpu_is_omap15xx()) 150 clk_set_rate(uart1_ck, 12000000); 151 } 152 break; 153 case 1: 154 uart2_ck = clk_get(NULL, "uart2_ck"); 155 if (IS_ERR(uart2_ck)) 156 printk("Could not get uart2_ck\n"); 157 else { 158 clk_enable(uart2_ck); 159 if (cpu_is_omap15xx()) 160 clk_set_rate(uart2_ck, 12000000); 161 else 162 clk_set_rate(uart2_ck, 48000000); 163 } 164 break; 165 case 2: 166 uart3_ck = clk_get(NULL, "uart3_ck"); 167 if (IS_ERR(uart3_ck)) 168 printk("Could not get uart3_ck\n"); 169 else { 170 clk_enable(uart3_ck); 171 if (cpu_is_omap15xx()) 172 clk_set_rate(uart3_ck, 12000000); 173 } 174 break; 175 } 176 omap_serial_reset(&serial_platform_data[i]); 177 } 178 } 179 180 #ifdef CONFIG_OMAP_SERIAL_WAKE 181 182 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) 183 { 184 /* Need to do something with serial port right after wake-up? */ 185 return IRQ_HANDLED; 186 } 187 188 /* 189 * Reroutes serial RX lines to GPIO lines for the duration of 190 * sleep to allow waking up the device from serial port even 191 * in deep sleep. 192 */ 193 void omap_serial_wake_trigger(int enable) 194 { 195 if (!cpu_is_omap16xx()) 196 return; 197 198 if (uart1_ck != NULL) { 199 if (enable) 200 omap_cfg_reg(V14_16XX_GPIO37); 201 else 202 omap_cfg_reg(V14_16XX_UART1_RX); 203 } 204 if (uart2_ck != NULL) { 205 if (enable) 206 omap_cfg_reg(R9_16XX_GPIO18); 207 else 208 omap_cfg_reg(R9_16XX_UART2_RX); 209 } 210 if (uart3_ck != NULL) { 211 if (enable) 212 omap_cfg_reg(L14_16XX_GPIO49); 213 else 214 omap_cfg_reg(L14_16XX_UART3_RX); 215 } 216 } 217 218 static void __init omap_serial_set_port_wakeup(int gpio_nr) 219 { 220 int ret; 221 222 ret = gpio_request(gpio_nr, "UART wake"); 223 if (ret < 0) { 224 printk(KERN_ERR "Could not request UART wake GPIO: %i\n", 225 gpio_nr); 226 return; 227 } 228 gpio_direction_input(gpio_nr); 229 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, 230 IRQF_TRIGGER_RISING, "serial wakeup", NULL); 231 if (ret) { 232 gpio_free(gpio_nr); 233 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", 234 gpio_nr); 235 return; 236 } 237 enable_irq_wake(gpio_to_irq(gpio_nr)); 238 } 239 240 int __init omap_serial_wakeup_init(void) 241 { 242 if (!cpu_is_omap16xx()) 243 return 0; 244 245 if (uart1_ck != NULL) 246 omap_serial_set_port_wakeup(37); 247 if (uart2_ck != NULL) 248 omap_serial_set_port_wakeup(18); 249 if (uart3_ck != NULL) 250 omap_serial_set_port_wakeup(49); 251 252 return 0; 253 } 254 255 #endif /* CONFIG_OMAP_SERIAL_WAKE */ 256 257 static int __init omap_init(void) 258 { 259 if (!cpu_class_is_omap1()) 260 return -ENODEV; 261 262 return platform_device_register(&serial_device); 263 } 264 arch_initcall(omap_init); 265