arch/arm/mach-omap1/serial.c

   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);