arch/arm/mach-integrator/core.c

   1 /*
   2  *  linux/arch/arm/mach-integrator/core.c
   3  *
   4  *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd
   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 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/device.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irq.h>
  17 #include <linux/sched.h>
  18 #include <linux/smp.h>
  19 #include <linux/termios.h>
  20 #include <linux/amba/bus.h>
  21 #include <linux/amba/serial.h>
  22 #include <linux/io.h>
  23
  24 #include <asm/clkdev.h>
  25 #include <mach/clkdev.h>
  26 #include <mach/hardware.h>
  27 #include <mach/platform.h>
  28 #include <asm/irq.h>
  29 #include <mach/cm.h>
  30 #include <asm/system.h>
  31 #include <asm/leds.h>
  32 #include <asm/mach/time.h>
  33
  34 static struct amba_pl010_data integrator_uart_data;
  35
  36 static struct amba_device rtc_device = {
  37         .dev            = {
  38                 .init_name = "mb:15",
  39         },
  40         .res            = {
  41                 .start  = INTEGRATOR_RTC_BASE,
  42                 .end    = INTEGRATOR_RTC_BASE + SZ_4K - 1,
  43                 .flags  = IORESOURCE_MEM,
  44         },
  45         .irq            = { IRQ_RTCINT, NO_IRQ },
  46         .periphid       = 0x00041030,
  47 };
  48
  49 static struct amba_device uart0_device = {
  50         .dev            = {
  51                 .init_name = "mb:16",
  52                 .platform_data = &integrator_uart_data,
  53         },
  54         .res            = {
  55                 .start  = INTEGRATOR_UART0_BASE,
  56                 .end    = INTEGRATOR_UART0_BASE + SZ_4K - 1,
  57                 .flags  = IORESOURCE_MEM,
  58         },
  59         .irq            = { IRQ_UARTINT0, NO_IRQ },
  60         .periphid       = 0x0041010,
  61 };
  62
  63 static struct amba_device uart1_device = {
  64         .dev            = {
  65                 .init_name = "mb:17",
  66                 .platform_data = &integrator_uart_data,
  67         },
  68         .res            = {
  69                 .start  = INTEGRATOR_UART1_BASE,
  70                 .end    = INTEGRATOR_UART1_BASE + SZ_4K - 1,
  71                 .flags  = IORESOURCE_MEM,
  72         },
  73         .irq            = { IRQ_UARTINT1, NO_IRQ },
  74         .periphid       = 0x0041010,
  75 };
  76
  77 static struct amba_device kmi0_device = {
  78         .dev            = {
  79                 .init_name = "mb:18",
  80         },
  81         .res            = {
  82                 .start  = KMI0_BASE,
  83                 .end    = KMI0_BASE + SZ_4K - 1,
  84                 .flags  = IORESOURCE_MEM,
  85         },
  86         .irq            = { IRQ_KMIINT0, NO_IRQ },
  87         .periphid       = 0x00041050,
  88 };
  89
  90 static struct amba_device kmi1_device = {
  91         .dev            = {
  92                 .init_name = "mb:19",
  93         },
  94         .res            = {
  95                 .start  = KMI1_BASE,
  96                 .end    = KMI1_BASE + SZ_4K - 1,
  97                 .flags  = IORESOURCE_MEM,
  98         },
  99         .irq            = { IRQ_KMIINT1, NO_IRQ },
 100         .periphid       = 0x00041050,
 101 };
 102
 103 static struct amba_device *amba_devs[] __initdata = {
 104         &rtc_device,
 105         &uart0_device,
 106         &uart1_device,
 107         &kmi0_device,
 108         &kmi1_device,
 109 };
 110
 111 /*
 112  * These are fixed clocks.
 113  */
 114 static struct clk clk24mhz = {
 115         .rate   = 24000000,
 116 };
 117
 118 static struct clk uartclk = {
 119         .rate   = 14745600,
 120 };
 121
 122 static struct clk_lookup lookups[] = {
 123         {       /* UART0 */
 124                 .dev_id         = "mb:16",
 125                 .clk            = &uartclk,
 126         }, {    /* UART1 */
 127                 .dev_id         = "mb:17",
 128                 .clk            = &uartclk,
 129         }, {    /* KMI0 */
 130                 .dev_id         = "mb:18",
 131                 .clk            = &clk24mhz,
 132         }, {    /* KMI1 */
 133                 .dev_id         = "mb:19",
 134                 .clk            = &clk24mhz,
 135         }, {    /* MMCI - IntegratorCP */
 136                 .dev_id         = "mb:1c",
 137                 .clk            = &uartclk,
 138         }
 139 };
 140
 141 static int __init integrator_init(void)
 142 {
 143         int i;
 144
 145         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 146
 147         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 148                 struct amba_device *d = amba_devs[i];
 149                 amba_device_register(d, &iomem_resource);
 150         }
 151
 152         return 0;
 153 }
 154
 155 arch_initcall(integrator_init);
 156
 157 /*
 158  * On the Integrator platform, the port RTS and DTR are provided by
 159  * bits in the following SC_CTRLS register bits:
 160  *        RTS  DTR
 161  *  UART0  7    6
 162  *  UART1  5    4
 163  */
 164 #define SC_CTRLC        IO_ADDRESS(INTEGRATOR_SC_CTRLC)
 165 #define SC_CTRLS        IO_ADDRESS(INTEGRATOR_SC_CTRLS)
 166
 167 static void integrator_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl)
 168 {
 169         unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
 170
 171         if (dev == &uart0_device) {
 172                 rts_mask = 1 << 4;
 173                 dtr_mask = 1 << 5;
 174         } else {
 175                 rts_mask = 1 << 6;
 176                 dtr_mask = 1 << 7;
 177         }
 178
 179         if (mctrl & TIOCM_RTS)
 180                 ctrlc |= rts_mask;
 181         else
 182                 ctrls |= rts_mask;
 183
 184         if (mctrl & TIOCM_DTR)
 185                 ctrlc |= dtr_mask;
 186         else
 187                 ctrls |= dtr_mask;
 188
 189         __raw_writel(ctrls, SC_CTRLS);
 190         __raw_writel(ctrlc, SC_CTRLC);
 191 }
 192
 193 static struct amba_pl010_data integrator_uart_data = {
 194         .set_mctrl = integrator_uart_set_mctrl,
 195 };
 196
 197 #define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_CTRL)
 198
 199 static DEFINE_SPINLOCK(cm_lock);
 200
 201 /**
 202  * cm_control - update the CM_CTRL register.
 203  * @mask: bits to change
 204  * @set: bits to set
 205  */
 206 void cm_control(u32 mask, u32 set)
 207 {
 208         unsigned long flags;
 209         u32 val;
 210
 211         spin_lock_irqsave(&cm_lock, flags);
 212         val = readl(CM_CTRL) & ~mask;
 213         writel(val | set, CM_CTRL);
 214         spin_unlock_irqrestore(&cm_lock, flags);
 215 }
 216
 217 EXPORT_SYMBOL(cm_control);