release/src-rt-6.x.4708/linux/linux-2.6.36/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/memblock.h>
  18 #include <linux/sched.h>
  19 #include <linux/smp.h>
  20 #include <linux/termios.h>
  21 #include <linux/amba/bus.h>
  22 #include <linux/amba/serial.h>
  23 #include <linux/io.h>
  24
  25 #include <asm/clkdev.h>
  26 #include <mach/clkdev.h>
  27 #include <mach/hardware.h>
  28 #include <mach/platform.h>
  29 #include <asm/irq.h>
  30 #include <mach/cm.h>
  31 #include <asm/system.h>
  32 #include <asm/leds.h>
  33 #include <asm/mach/time.h>
  34 #include <asm/pgtable.h>
  35
  36 static struct amba_pl010_data integrator_uart_data;
  37
  38 static struct amba_device rtc_device = {
  39         .dev            = {
  40                 .init_name = "mb:15",
  41         },
  42         .res            = {
  43                 .start  = INTEGRATOR_RTC_BASE,
  44                 .end    = INTEGRATOR_RTC_BASE + SZ_4K - 1,
  45                 .flags  = IORESOURCE_MEM,
  46         },
  47         .irq            = { IRQ_RTCINT, NO_IRQ },
  48         .periphid       = 0x00041030,
  49 };
  50
  51 static struct amba_device uart0_device = {
  52         .dev            = {
  53                 .init_name = "mb:16",
  54                 .platform_data = &integrator_uart_data,
  55         },
  56         .res            = {
  57                 .start  = INTEGRATOR_UART0_BASE,
  58                 .end    = INTEGRATOR_UART0_BASE + SZ_4K - 1,
  59                 .flags  = IORESOURCE_MEM,
  60         },
  61         .irq            = { IRQ_UARTINT0, NO_IRQ },
  62         .periphid       = 0x0041010,
  63 };
  64
  65 static struct amba_device uart1_device = {
  66         .dev            = {
  67                 .init_name = "mb:17",
  68                 .platform_data = &integrator_uart_data,
  69         },
  70         .res            = {
  71                 .start  = INTEGRATOR_UART1_BASE,
  72                 .end    = INTEGRATOR_UART1_BASE + SZ_4K - 1,
  73                 .flags  = IORESOURCE_MEM,
  74         },
  75         .irq            = { IRQ_UARTINT1, NO_IRQ },
  76         .periphid       = 0x0041010,
  77 };
  78
  79 static struct amba_device kmi0_device = {
  80         .dev            = {
  81                 .init_name = "mb:18",
  82         },
  83         .res            = {
  84                 .start  = KMI0_BASE,
  85                 .end    = KMI0_BASE + SZ_4K - 1,
  86                 .flags  = IORESOURCE_MEM,
  87         },
  88         .irq            = { IRQ_KMIINT0, NO_IRQ },
  89         .periphid       = 0x00041050,
  90 };
  91
  92 static struct amba_device kmi1_device = {
  93         .dev            = {
  94                 .init_name = "mb:19",
  95         },
  96         .res            = {
  97                 .start  = KMI1_BASE,
  98                 .end    = KMI1_BASE + SZ_4K - 1,
  99                 .flags  = IORESOURCE_MEM,
 100         },
 101         .irq            = { IRQ_KMIINT1, NO_IRQ },
 102         .periphid       = 0x00041050,
 103 };
 104
 105 static struct amba_device *amba_devs[] __initdata = {
 106         &rtc_device,
 107         &uart0_device,
 108         &uart1_device,
 109         &kmi0_device,
 110         &kmi1_device,
 111 };
 112
 113 /*
 114  * These are fixed clocks.
 115  */
 116 static struct clk clk24mhz = {
 117         .rate   = 24000000,
 118 };
 119
 120 static struct clk uartclk = {
 121         .rate   = 14745600,
 122 };
 123
 124 static struct clk dummy_apb_pclk;
 125
 126 static struct clk_lookup lookups[] = {
 127         {       /* Bus clock */
 128                 .con_id         = "apb_pclk",
 129                 .clk            = &dummy_apb_pclk,
 130         }, {    /* UART0 */
 131                 .dev_id         = "mb:16",
 132                 .clk            = &uartclk,
 133         }, {    /* UART1 */
 134                 .dev_id         = "mb:17",
 135                 .clk            = &uartclk,
 136         }, {    /* KMI0 */
 137                 .dev_id         = "mb:18",
 138                 .clk            = &clk24mhz,
 139         }, {    /* KMI1 */
 140                 .dev_id         = "mb:19",
 141                 .clk            = &clk24mhz,
 142         }, {    /* MMCI - IntegratorCP */
 143                 .dev_id         = "mb:1c",
 144                 .clk            = &uartclk,
 145         }
 146 };
 147
 148 static int __init integrator_init(void)
 149 {
 150         int i;
 151
 152         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 153
 154         for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 155                 struct amba_device *d = amba_devs[i];
 156                 amba_device_register(d, &iomem_resource);
 157         }
 158
 159         return 0;
 160 }
 161
 162 arch_initcall(integrator_init);
 163
 164 /*
 165  * On the Integrator platform, the port RTS and DTR are provided by
 166  * bits in the following SC_CTRLS register bits:
 167  *        RTS  DTR
 168  *  UART0  7    6
 169  *  UART1  5    4
 170  */
 171 #define SC_CTRLC        IO_ADDRESS(INTEGRATOR_SC_CTRLC)
 172 #define SC_CTRLS        IO_ADDRESS(INTEGRATOR_SC_CTRLS)
 173
 174 static void integrator_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl)
 175 {
 176         unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
 177
 178         if (dev == &uart0_device) {
 179                 rts_mask = 1 << 4;
 180                 dtr_mask = 1 << 5;
 181         } else {
 182                 rts_mask = 1 << 6;
 183                 dtr_mask = 1 << 7;
 184         }
 185
 186         if (mctrl & TIOCM_RTS)
 187                 ctrlc |= rts_mask;
 188         else
 189                 ctrls |= rts_mask;
 190
 191         if (mctrl & TIOCM_DTR)
 192                 ctrlc |= dtr_mask;
 193         else
 194                 ctrls |= dtr_mask;
 195
 196         __raw_writel(ctrls, SC_CTRLS);
 197         __raw_writel(ctrlc, SC_CTRLC);
 198 }
 199
 200 static struct amba_pl010_data integrator_uart_data = {
 201         .set_mctrl = integrator_uart_set_mctrl,
 202 };
 203
 204 #define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_CTRL)
 205
 206 static DEFINE_SPINLOCK(cm_lock);
 207
 208 /**
 209  * cm_control - update the CM_CTRL register.
 210  * @mask: bits to change
 211  * @set: bits to set
 212  */
 213 void cm_control(u32 mask, u32 set)
 214 {
 215         unsigned long flags;
 216         u32 val;
 217
 218         spin_lock_irqsave(&cm_lock, flags);
 219         val = readl(CM_CTRL) & ~mask;
 220         writel(val | set, CM_CTRL);
 221         spin_unlock_irqrestore(&cm_lock, flags);
 222 }
 223
 224 EXPORT_SYMBOL(cm_control);
 225
 226 /*
 227  * We need to stop things allocating the low memory; ideally we need a
 228  * better implementation of GFP_DMA which does not assume that DMA-able
 229  * memory starts at zero.
 230  */
 231 void __init integrator_reserve(void)
 232 {
 233         memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
 234 }