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 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 .mapbase = OMAP_UART1_BASE, 68 .irq = INT_UART1, 69 .flags = UPF_BOOT_AUTOCONF, 70 .iotype = UPIO_MEM, 71 .regshift = 2, 72 .uartclk = OMAP16XX_BASE_BAUD * 16, 73 }, 74 { 75 .mapbase = OMAP_UART2_BASE, 76 .irq = INT_UART2, 77 .flags = UPF_BOOT_AUTOCONF, 78 .iotype = UPIO_MEM, 79 .regshift = 2, 80 .uartclk = OMAP16XX_BASE_BAUD * 16, 81 }, 82 { 83 .mapbase = OMAP_UART3_BASE, 84 .irq = INT_UART3, 85 .flags = UPF_BOOT_AUTOCONF, 86 .iotype = UPIO_MEM, 87 .regshift = 2, 88 .uartclk = OMAP16XX_BASE_BAUD * 16, 89 }, 90 { }, 91 }; 92 93 static struct platform_device serial_device = { 94 .name = "serial8250", 95 .id = PLAT8250_DEV_PLATFORM, 96 .dev = { 97 .platform_data = serial_platform_data, 98 }, 99 }; 100 101 /* 102 * Note that on Innovator-1510 UART2 pins conflict with USB2. 103 * By default UART2 does not work on Innovator-1510 if you have 104 * USB OHCI enabled. To use UART2, you must disable USB2 first. 105 */ 106 void __init omap_serial_init(void) 107 { 108 int i; 109 110 if (cpu_is_omap7xx()) { 111 serial_platform_data[0].regshift = 0; 112 serial_platform_data[1].regshift = 0; 113 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1; 114 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2; 115 } 116 117 if (cpu_is_omap15xx()) { 118 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; 119 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; 120 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; 121 } 122 123 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) { 124 125 /* Static mapping, never released */ 126 serial_platform_data[i].membase = 127 ioremap(serial_platform_data[i].mapbase, SZ_2K); 128 if (!serial_platform_data[i].membase) { 129 printk(KERN_ERR "Could not ioremap uart%i\n", i); 130 continue; 131 } 132 switch (i) { 133 case 0: 134 uart1_ck = clk_get(NULL, "uart1_ck"); 135 if (IS_ERR(uart1_ck)) 136 printk("Could not get uart1_ck\n"); 137 else { 138 clk_enable(uart1_ck); 139 if (cpu_is_omap15xx()) 140 clk_set_rate(uart1_ck, 12000000); 141 } 142 break; 143 case 1: 144 uart2_ck = clk_get(NULL, "uart2_ck"); 145 if (IS_ERR(uart2_ck)) 146 printk("Could not get uart2_ck\n"); 147 else { 148 clk_enable(uart2_ck); 149 if (cpu_is_omap15xx()) 150 clk_set_rate(uart2_ck, 12000000); 151 else 152 clk_set_rate(uart2_ck, 48000000); 153 } 154 break; 155 case 2: 156 uart3_ck = clk_get(NULL, "uart3_ck"); 157 if (IS_ERR(uart3_ck)) 158 printk("Could not get uart3_ck\n"); 159 else { 160 clk_enable(uart3_ck); 161 if (cpu_is_omap15xx()) 162 clk_set_rate(uart3_ck, 12000000); 163 } 164 break; 165 } 166 omap_serial_reset(&serial_platform_data[i]); 167 } 168 } 169 170 #ifdef CONFIG_OMAP_SERIAL_WAKE 171 172 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) 173 { 174 /* Need to do something with serial port right after wake-up? */ 175 return IRQ_HANDLED; 176 } 177 178 /* 179 * Reroutes serial RX lines to GPIO lines for the duration of 180 * sleep to allow waking up the device from serial port even 181 * in deep sleep. 182 */ 183 void omap_serial_wake_trigger(int enable) 184 { 185 if (!cpu_is_omap16xx()) 186 return; 187 188 if (uart1_ck != NULL) { 189 if (enable) 190 omap_cfg_reg(V14_16XX_GPIO37); 191 else 192 omap_cfg_reg(V14_16XX_UART1_RX); 193 } 194 if (uart2_ck != NULL) { 195 if (enable) 196 omap_cfg_reg(R9_16XX_GPIO18); 197 else 198 omap_cfg_reg(R9_16XX_UART2_RX); 199 } 200 if (uart3_ck != NULL) { 201 if (enable) 202 omap_cfg_reg(L14_16XX_GPIO49); 203 else 204 omap_cfg_reg(L14_16XX_UART3_RX); 205 } 206 } 207 208 static void __init omap_serial_set_port_wakeup(int gpio_nr) 209 { 210 int ret; 211 212 ret = gpio_request(gpio_nr, "UART wake"); 213 if (ret < 0) { 214 printk(KERN_ERR "Could not request UART wake GPIO: %i\n", 215 gpio_nr); 216 return; 217 } 218 gpio_direction_input(gpio_nr); 219 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, 220 IRQF_TRIGGER_RISING, "serial wakeup", NULL); 221 if (ret) { 222 gpio_free(gpio_nr); 223 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", 224 gpio_nr); 225 return; 226 } 227 enable_irq_wake(gpio_to_irq(gpio_nr)); 228 } 229 230 static int __init omap_serial_wakeup_init(void) 231 { 232 if (!cpu_is_omap16xx()) 233 return 0; 234 235 if (uart1_ck != NULL) 236 omap_serial_set_port_wakeup(37); 237 if (uart2_ck != NULL) 238 omap_serial_set_port_wakeup(18); 239 if (uart3_ck != NULL) 240 omap_serial_set_port_wakeup(49); 241 242 return 0; 243 } 244 late_initcall(omap_serial_wakeup_init); 245 246 #endif /* CONFIG_OMAP_SERIAL_WAKE */ 247 248 static int __init omap_init(void) 249 { 250 return platform_device_register(&serial_device); 251 } 252 arch_initcall(omap_init); 253