arch/arm/mach-integrator/integrator_cp.c

   1 /*
   2  *  linux/arch/arm/mach-integrator/integrator_cp.c
   3  *
   4  *  Copyright (C) 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 as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  */
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/list.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/string.h>
  17 #include <linux/device.h>
  18 #include <linux/amba/bus.h>
  19 #include <linux/amba/kmi.h>
  20 #include <linux/amba/clcd.h>
  21 #include <linux/platform_data/video-clcd-versatile.h>
  22 #include <linux/amba/mmci.h>
  23 #include <linux/io.h>
  24 #include <linux/irqchip.h>
  25 #include <linux/gfp.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_address.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/sched_clock.h>
  30
  31 #include <asm/setup.h>
  32 #include <asm/mach-types.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/irq.h>
  35 #include <asm/mach/map.h>
  36 #include <asm/mach/time.h>
  37
  38 #include "hardware.h"
  39 #include "cm.h"
  40 #include "common.h"
  41
  42 /* Base address to the CP controller */
  43 static void __iomem *intcp_con_base;
  44
  45 #define INTCP_PA_CLCD_BASE              0xc0000000
  46
  47 /*
  48  * Logical      Physical
  49  * f1000000     10000000        Core module registers
  50  * f1300000     13000000        Counter/Timer
  51  * f1400000     14000000        Interrupt controller
  52  * f1600000     16000000        UART 0
  53  * f1700000     17000000        UART 1
  54  * f1a00000     1a000000        Debug LEDs
  55  * fc900000     c9000000        GPIO
  56  * fca00000     ca000000        SIC
  57  */
  58
  59 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
  60         {
  61                 .virtual        = IO_ADDRESS(INTEGRATOR_HDR_BASE),
  62                 .pfn            = __phys_to_pfn(INTEGRATOR_HDR_BASE),
  63                 .length         = SZ_4K,
  64                 .type           = MT_DEVICE
  65         }, {
  66                 .virtual        = IO_ADDRESS(INTEGRATOR_CT_BASE),
  67                 .pfn            = __phys_to_pfn(INTEGRATOR_CT_BASE),
  68                 .length         = SZ_4K,
  69                 .type           = MT_DEVICE
  70         }, {
  71                 .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
  72                 .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
  73                 .length         = SZ_4K,
  74                 .type           = MT_DEVICE
  75         }, {
  76                 .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
  77                 .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
  78                 .length         = SZ_4K,
  79                 .type           = MT_DEVICE
  80         }, {
  81                 .virtual        = IO_ADDRESS(INTEGRATOR_DBG_BASE),
  82                 .pfn            = __phys_to_pfn(INTEGRATOR_DBG_BASE),
  83                 .length         = SZ_4K,
  84                 .type           = MT_DEVICE
  85         }, {
  86                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_GPIO_BASE),
  87                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_GPIO_BASE),
  88                 .length         = SZ_4K,
  89                 .type           = MT_DEVICE
  90         }, {
  91                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
  92                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
  93                 .length         = SZ_4K,
  94                 .type           = MT_DEVICE
  95         }
  96 };
  97
  98 static void __init intcp_map_io(void)
  99 {
 100         iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
 101 }
 102
 103 /*
 104  * It seems that the card insertion interrupt remains active after
 105  * we've acknowledged it.  We therefore ignore the interrupt, and
 106  * rely on reading it from the SIC.  This also means that we must
 107  * clear the latched interrupt.
 108  */
 109 static unsigned int mmc_status(struct device *dev)
 110 {
 111         unsigned int status = readl(__io_address(0xca000000 + 4));
 112         writel(8, intcp_con_base + 8);
 113
 114         return status & 8;
 115 }
 116
 117 static struct mmci_platform_data mmc_data = {
 118         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 119         .status         = mmc_status,
 120         .gpio_wp        = -1,
 121         .gpio_cd        = -1,
 122 };
 123
 124 /*
 125  * CLCD support
 126  */
 127 /*
 128  * Ensure VGA is selected.
 129  */
 130 static void cp_clcd_enable(struct clcd_fb *fb)
 131 {
 132         struct fb_var_screeninfo *var = &fb->fb.var;
 133         u32 val = CM_CTRL_STATIC1 | CM_CTRL_STATIC2
 134                         | CM_CTRL_LCDEN0 | CM_CTRL_LCDEN1;
 135
 136         if (var->bits_per_pixel <= 8 ||
 137             (var->bits_per_pixel == 16 && var->green.length == 5))
 138                 /* Pseudocolor, RGB555, BGR555 */
 139                 val |= CM_CTRL_LCDMUXSEL_VGA555_TFT555;
 140         else if (fb->fb.var.bits_per_pixel <= 16)
 141                 /* truecolor RGB565 */
 142                 val |= CM_CTRL_LCDMUXSEL_VGA565_TFT555;
 143         else
 144                 val = 0; /* no idea for this, don't trust the docs */
 145
 146         cm_control(CM_CTRL_LCDMUXSEL_MASK|
 147                    CM_CTRL_LCDEN0|
 148                    CM_CTRL_LCDEN1|
 149                    CM_CTRL_STATIC1|
 150                    CM_CTRL_STATIC2|
 151                    CM_CTRL_STATIC|
 152                    CM_CTRL_n24BITEN, val);
 153 }
 154
 155 static int cp_clcd_setup(struct clcd_fb *fb)
 156 {
 157         fb->panel = versatile_clcd_get_panel("VGA");
 158         if (!fb->panel)
 159                 return -EINVAL;
 160
 161         return versatile_clcd_setup_dma(fb, SZ_1M);
 162 }
 163
 164 static struct clcd_board clcd_data = {
 165         .name           = "Integrator/CP",
 166         .caps           = CLCD_CAP_5551 | CLCD_CAP_RGB565 | CLCD_CAP_888,
 167         .check          = clcdfb_check,
 168         .decode         = clcdfb_decode,
 169         .enable         = cp_clcd_enable,
 170         .setup          = cp_clcd_setup,
 171         .mmap           = versatile_clcd_mmap_dma,
 172         .remove         = versatile_clcd_remove_dma,
 173 };
 174
 175 #define REFCOUNTER (__io_address(INTEGRATOR_HDR_BASE) + 0x28)
 176
 177 static u64 notrace intcp_read_sched_clock(void)
 178 {
 179         return readl(REFCOUNTER);
 180 }
 181
 182 static void __init intcp_init_early(void)
 183 {
 184         sched_clock_register(intcp_read_sched_clock, 32, 24000000);
 185 }
 186
 187 static void __init intcp_init_irq_of(void)
 188 {
 189         cm_init();
 190         irqchip_init();
 191 }
 192
 193 /*
 194  * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
 195  * and enforce the bus names since these are used for clock lookups.
 196  */
 197 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 198         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 199                 "rtc", NULL),
 200         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
 201                 "uart0", NULL),
 202         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
 203                 "uart1", NULL),
 204         OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 205                 "kmi0", NULL),
 206         OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
 207                 "kmi1", NULL),
 208         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
 209                 "mmci", &mmc_data),
 210         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_AACI_BASE,
 211                 "aaci", &mmc_data),
 212         OF_DEV_AUXDATA("arm,primecell", INTCP_PA_CLCD_BASE,
 213                 "clcd", &clcd_data),
 214         { /* sentinel */ },
 215 };
 216
 217 static const struct of_device_id intcp_syscon_match[] = {
 218         { .compatible = "arm,integrator-cp-syscon"},
 219         { },
 220 };
 221
 222 static void __init intcp_init_of(void)
 223 {
 224         struct device_node *cpcon;
 225
 226         cpcon = of_find_matching_node(NULL, intcp_syscon_match);
 227         if (!cpcon)
 228                 return;
 229
 230         intcp_con_base = of_iomap(cpcon, 0);
 231         if (!intcp_con_base)
 232                 return;
 233
 234         of_platform_default_populate(NULL, intcp_auxdata_lookup, NULL);
 235 }
 236
 237 static const char * intcp_dt_board_compat[] = {
 238         "arm,integrator-cp",
 239         NULL,
 240 };
 241
 242 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
 243         .reserve        = integrator_reserve,
 244         .map_io         = intcp_map_io,
 245         .init_early     = intcp_init_early,
 246         .init_irq       = intcp_init_irq_of,
 247         .init_machine   = intcp_init_of,
 248         .dt_compat      = intcp_dt_board_compat,
 249 MACHINE_END