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 <mach/board.h> 26 #include <mach/mux.h> 27 #include <mach/gpio.h> 28 #include <mach/fpga.h> 29 30 static struct clk * uart1_ck; 31 static struct clk * uart2_ck; 32 static struct clk * uart3_ck; 33 34 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, 35 int offset) 36 { 37 offset <<= up->regshift; 38 return (unsigned int)__raw_readb(up->membase + offset); 39 } 40 41 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, 42 int value) 43 { 44 offset <<= p->regshift; 45 __raw_writeb(value, p->membase + offset); 46 } 47 48 /* 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. 52 */ 53 static void __init omap_serial_reset(struct plat_serial8250_port *p) 54 { 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 */ 58 59 if (!cpu_is_omap15xx()) { 60 omap_serial_outp(p, UART_OMAP_SYSC, 0x01); 61 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); 62 } 63 } 64 65 static struct plat_serial8250_port serial_platform_data[] = { 66 { 67 .membase = OMAP1_IO_ADDRESS(OMAP_UART1_BASE), 68 .mapbase = OMAP_UART1_BASE, 69 .irq = INT_UART1, 70 .flags = UPF_BOOT_AUTOCONF, 71 .iotype = UPIO_MEM, 72 .regshift = 2, 73 .uartclk = OMAP16XX_BASE_BAUD * 16, 74 }, 75 { 76 .membase = OMAP1_IO_ADDRESS(OMAP_UART2_BASE), 77 .mapbase = OMAP_UART2_BASE, 78 .irq = INT_UART2, 79 .flags = UPF_BOOT_AUTOCONF, 80 .iotype = UPIO_MEM, 81 .regshift = 2, 82 .uartclk = OMAP16XX_BASE_BAUD * 16, 83 }, 84 { 85 .membase = OMAP1_IO_ADDRESS(OMAP_UART3_BASE), 86 .mapbase = OMAP_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_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; 118 } 119 120 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; 125 } 126 127 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; 131 } 132 133 for (i = 0; i < OMAP_MAX_NR_PORTS; i++) { 134 switch (i) { 135 case 0: 136 uart1_ck = clk_get(NULL, "uart1_ck"); 137 if (IS_ERR(uart1_ck)) 138 printk("Could not get uart1_ck\n"); 139 else { 140 clk_enable(uart1_ck); 141 if (cpu_is_omap15xx()) 142 clk_set_rate(uart1_ck, 12000000); 143 } 144 break; 145 case 1: 146 uart2_ck = clk_get(NULL, "uart2_ck"); 147 if (IS_ERR(uart2_ck)) 148 printk("Could not get uart2_ck\n"); 149 else { 150 clk_enable(uart2_ck); 151 if (cpu_is_omap15xx()) 152 clk_set_rate(uart2_ck, 12000000); 153 else 154 clk_set_rate(uart2_ck, 48000000); 155 } 156 break; 157 case 2: 158 uart3_ck = clk_get(NULL, "uart3_ck"); 159 if (IS_ERR(uart3_ck)) 160 printk("Could not get uart3_ck\n"); 161 else { 162 clk_enable(uart3_ck); 163 if (cpu_is_omap15xx()) 164 clk_set_rate(uart3_ck, 12000000); 165 } 166 break; 167 } 168 omap_serial_reset(&serial_platform_data[i]); 169 } 170 } 171 172 #ifdef CONFIG_OMAP_SERIAL_WAKE 173 174 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) 175 { 176 /* Need to do something with serial port right after wake-up? */ 177 return IRQ_HANDLED; 178 } 179 180 /* 181 * Reroutes serial RX lines to GPIO lines for the duration of 182 * sleep to allow waking up the device from serial port even 183 * in deep sleep. 184 */ 185 void omap_serial_wake_trigger(int enable) 186 { 187 if (!cpu_is_omap16xx()) 188 return; 189 190 if (uart1_ck != NULL) { 191 if (enable) 192 omap_cfg_reg(V14_16XX_GPIO37); 193 else 194 omap_cfg_reg(V14_16XX_UART1_RX); 195 } 196 if (uart2_ck != NULL) { 197 if (enable) 198 omap_cfg_reg(R9_16XX_GPIO18); 199 else 200 omap_cfg_reg(R9_16XX_UART2_RX); 201 } 202 if (uart3_ck != NULL) { 203 if (enable) 204 omap_cfg_reg(L14_16XX_GPIO49); 205 else 206 omap_cfg_reg(L14_16XX_UART3_RX); 207 } 208 } 209 210 static void __init omap_serial_set_port_wakeup(int gpio_nr) 211 { 212 int ret; 213 214 ret = gpio_request(gpio_nr, "UART wake"); 215 if (ret < 0) { 216 printk(KERN_ERR "Could not request UART wake GPIO: %i\n", 217 gpio_nr); 218 return; 219 } 220 gpio_direction_input(gpio_nr); 221 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, 222 IRQF_TRIGGER_RISING, "serial wakeup", NULL); 223 if (ret) { 224 gpio_free(gpio_nr); 225 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", 226 gpio_nr); 227 return; 228 } 229 enable_irq_wake(gpio_to_irq(gpio_nr)); 230 } 231 232 static int __init omap_serial_wakeup_init(void) 233 { 234 if (!cpu_is_omap16xx()) 235 return 0; 236 237 if (uart1_ck != NULL) 238 omap_serial_set_port_wakeup(37); 239 if (uart2_ck != NULL) 240 omap_serial_set_port_wakeup(18); 241 if (uart3_ck != NULL) 242 omap_serial_set_port_wakeup(49); 243 244 return 0; 245 } 246 late_initcall(omap_serial_wakeup_init); 247 248 #endif /* CONFIG_OMAP_SERIAL_WAKE */ 249 250 static int __init omap_init(void) 251 { 252 return platform_device_register(&serial_device); 253 } 254 arch_initcall(omap_init); 255