arch/arm/cpu/arm926ejs/lpc32xx/devices.c

   1 /*
   2  * Copyright (C) 2011 by Vladimir Zapolskiy <vz@mleia.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/arch/cpu.h>
   9 #include <asm/arch/clk.h>
  10 #include <asm/arch/uart.h>
  11 #include <asm/io.h>
  12 #include <dm.h>
  13
  14 static struct clk_pm_regs    *clk  = (struct clk_pm_regs *)CLK_PM_BASE;
  15 static struct uart_ctrl_regs *ctrl = (struct uart_ctrl_regs *)UART_CTRL_BASE;
  16
  17 void lpc32xx_uart_init(unsigned int uart_id)
  18 {
  19         if (uart_id < 1 || uart_id > 7)
  20                 return;
  21
  22         /* Disable loopback mode, if it is set by S1L bootloader */
  23         clrbits_le32(&ctrl->loop,
  24                      UART_LOOPBACK(CONFIG_SYS_LPC32XX_UART));
  25
  26         if (uart_id < 3 || uart_id > 6)
  27                 return;
  28
  29         /* Enable UART system clock */
  30         setbits_le32(&clk->uartclk_ctrl, CLK_UART(uart_id));
  31
  32         /* Set UART into autoclock mode */
  33         clrsetbits_le32(&ctrl->clkmode,
  34                         UART_CLKMODE_MASK(uart_id),
  35                         UART_CLKMODE_AUTO(uart_id));
  36
  37         /* Bypass pre-divider of UART clock */
  38         writel(CLK_UART_X_DIV(1) | CLK_UART_Y_DIV(1),
  39                &clk->u3clk + (uart_id - 3));
  40 }
  41
  42 void lpc32xx_mac_init(void)
  43 {
  44         /* Enable MAC interface */
  45         writel(CLK_MAC_REG | CLK_MAC_SLAVE | CLK_MAC_MASTER
  46                 | CLK_MAC_MII, &clk->macclk_ctrl);
  47 }
  48
  49 void lpc32xx_mlc_nand_init(void)
  50 {
  51         /* Enable NAND interface */
  52         writel(CLK_NAND_MLC | CLK_NAND_MLC_INT, &clk->flashclk_ctrl);
  53 }
  54
  55 void lpc32xx_i2c_init(unsigned int devnum)
  56 {
  57         /* Enable I2C interface */
  58         uint32_t ctrl = readl(&clk->i2cclk_ctrl);
  59         if (devnum == 1)
  60                 ctrl |= CLK_I2C1_ENABLE;
  61         if (devnum == 2)
  62                 ctrl |= CLK_I2C2_ENABLE;
  63         writel(ctrl, &clk->i2cclk_ctrl);
  64 }
  65
  66 U_BOOT_DEVICE(lpc32xx_gpios) = {
  67         .name = "gpio_lpc32xx"
  68 };