arch/arm/mach-omap1/serial.c

   1 /*
   2  * linux/arch/arm/mach-omap1/id.c
   3  *
   4  * OMAP1 CPU identification code
   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/config.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.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
  21 #include <asm/io.h>
  22 #include <asm/mach-types.h>
  23 #include <asm/hardware/clock.h>
  24
  25 #include <asm/arch/board.h>
  26 #include <asm/arch/mux.h>
  27 #include <asm/arch/fpga.h>
  28
  29 static struct clk * uart1_ck = NULL;
  30 static struct clk * uart2_ck = NULL;
  31 static struct clk * uart3_ck = NULL;
  32
  33 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
  34                                           int offset)
  35 {
  36         offset <<= up->regshift;
  37         return (unsigned int)__raw_readb(up->membase + offset);
  38 }
  39
  40 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
  41                                     int value)
  42 {
  43         offset <<= p->regshift;
  44         __raw_writeb(value, p->membase + offset);
  45 }
  46
  47 /*
  48  * Internal UARTs need to be initialized for the 8250 autoconfig to work
  49  * properly. Note that the TX watermark initialization may not be needed
  50  * once the 8250.c watermark handling code is merged.
  51  */
  52 static void __init omap_serial_reset(struct plat_serial8250_port *p)
  53 {
  54         omap_serial_outp(p, UART_OMAP_MDR1, 0x07);      /* disable UART */
  55         omap_serial_outp(p, UART_OMAP_SCR, 0x08);       /* TX watermark */
  56         omap_serial_outp(p, UART_OMAP_MDR1, 0x00);      /* enable UART */
  57
  58         if (!cpu_is_omap1510()) {
  59                 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
  60                 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
  61         }
  62 }
  63
  64 static struct plat_serial8250_port serial_platform_data[] = {
  65         {
  66                 .membase        = (char*)IO_ADDRESS(OMAP_UART1_BASE),
  67                 .mapbase        = (unsigned long)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                 .membase        = (char*)IO_ADDRESS(OMAP_UART2_BASE),
  76                 .mapbase        = (unsigned long)OMAP_UART2_BASE,
  77                 .irq            = INT_UART2,
  78                 .flags          = UPF_BOOT_AUTOCONF,
  79                 .iotype         = UPIO_MEM,
  80                 .regshift       = 2,
  81                 .uartclk        = OMAP16XX_BASE_BAUD * 16,
  82         },
  83         {
  84                 .membase        = (char*)IO_ADDRESS(OMAP_UART3_BASE),
  85                 .mapbase        = (unsigned long)OMAP_UART3_BASE,
  86                 .irq            = INT_UART3,
  87                 .flags          = UPF_BOOT_AUTOCONF,
  88                 .iotype         = UPIO_MEM,
  89                 .regshift       = 2,
  90                 .uartclk        = OMAP16XX_BASE_BAUD * 16,
  91         },
  92         { },
  93 };
  94
  95 static struct platform_device serial_device = {
  96         .name                   = "serial8250",
  97         .id                     = 0,
  98         .dev                    = {
  99                 .platform_data  = serial_platform_data,
 100         },
 101 };
 102
 103 /*
 104  * Note that on Innovator-1510 UART2 pins conflict with USB2.
 105  * By default UART2 does not work on Innovator-1510 if you have
 106  * USB OHCI enabled. To use UART2, you must disable USB2 first.
 107  */
 108 void __init omap_serial_init(int ports[OMAP_MAX_NR_PORTS])
 109 {
 110         int i;
 111
 112         if (cpu_is_omap730()) {
 113                 serial_platform_data[0].regshift = 0;
 114                 serial_platform_data[1].regshift = 0;
 115                 serial_platform_data[0].irq = INT_730_UART_MODEM_1;
 116                 serial_platform_data[1].irq = INT_730_UART_MODEM_IRDA_2;
 117         }
 118
 119         if (cpu_is_omap1510()) {
 120                 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
 121                 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
 122                 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
 123         }
 124
 125         for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
 126                 unsigned char reg;
 127
 128                 if (ports[i] == 0) {
 129                         serial_platform_data[i].membase = NULL;
 130                         serial_platform_data[i].mapbase = 0;
 131                         continue;
 132                 }
 133
 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_use(uart1_ck);
 141                                 if (cpu_is_omap1510())
 142                                         clk_set_rate(uart1_ck, 12000000);
 143                         }
 144                         if (cpu_is_omap1510()) {
 145                                 omap_cfg_reg(UART1_TX);
 146                                 omap_cfg_reg(UART1_RTS);
 147                                 if (machine_is_omap_innovator()) {
 148                                         reg = fpga_read(OMAP1510_FPGA_POWER);
 149                                         reg |= OMAP1510_FPGA_PCR_COM1_EN;
 150                                         fpga_write(reg, OMAP1510_FPGA_POWER);
 151                                         udelay(10);
 152                                 }
 153                         }
 154                         break;
 155                 case 1:
 156                         uart2_ck = clk_get(NULL, "uart2_ck");
 157                         if (IS_ERR(uart2_ck))
 158                                 printk("Could not get uart2_ck\n");
 159                         else {
 160                                 clk_use(uart2_ck);
 161                                 if (cpu_is_omap1510())
 162                                         clk_set_rate(uart2_ck, 12000000);
 163                                 else
 164                                         clk_set_rate(uart2_ck, 48000000);
 165                         }
 166                         if (cpu_is_omap1510()) {
 167                                 omap_cfg_reg(UART2_TX);
 168                                 omap_cfg_reg(UART2_RTS);
 169                                 if (machine_is_omap_innovator()) {
 170                                         reg = fpga_read(OMAP1510_FPGA_POWER);
 171                                         reg |= OMAP1510_FPGA_PCR_COM2_EN;
 172                                         fpga_write(reg, OMAP1510_FPGA_POWER);
 173                                         udelay(10);
 174                                 }
 175                         }
 176                         break;
 177                 case 2:
 178                         uart3_ck = clk_get(NULL, "uart3_ck");
 179                         if (IS_ERR(uart3_ck))
 180                                 printk("Could not get uart3_ck\n");
 181                         else {
 182                                 clk_use(uart3_ck);
 183                                 if (cpu_is_omap1510())
 184                                         clk_set_rate(uart3_ck, 12000000);
 185                         }
 186                         if (cpu_is_omap1510()) {
 187                                 omap_cfg_reg(UART3_TX);
 188                                 omap_cfg_reg(UART3_RX);
 189                         }
 190                         break;
 191                 }
 192                 omap_serial_reset(&serial_platform_data[i]);
 193         }
 194 }
 195
 196 static int __init omap_init(void)
 197 {
 198         return platform_device_register(&serial_device);
 199 }
 200 arch_initcall(omap_init);