kernel/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/mtd/physmap.h>
  27 #include <linux/of_irq.h>
  28 #include <linux/of_address.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/sched_clock.h>
  31
  32 #include <asm/setup.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/irq.h>
  36 #include <asm/mach/map.h>
  37 #include <asm/mach/time.h>
  38
  39 #include "hardware.h"
  40 #include "cm.h"
  41 #include "common.h"
  42
  43 /* Base address to the CP controller */
  44 static void __iomem *intcp_con_base;
  45
  46 #define INTCP_PA_FLASH_BASE             0x24000000
  47
  48 #define INTCP_PA_CLCD_BASE              0xc0000000
  49
  50 #define INTCP_FLASHPROG                 0x04
  51 #define CINTEGRATOR_FLASHPROG_FLVPPEN   (1 << 0)
  52 #define CINTEGRATOR_FLASHPROG_FLWREN    (1 << 1)
  53
  54 /*
  55  * Logical      Physical
  56  * f1000000     10000000        Core module registers
  57  * f1300000     13000000        Counter/Timer
  58  * f1400000     14000000        Interrupt controller
  59  * f1600000     16000000        UART 0
  60  * f1700000     17000000        UART 1
  61  * f1a00000     1a000000        Debug LEDs
  62  * fc900000     c9000000        GPIO
  63  * fca00000     ca000000        SIC
  64  */
  65
  66 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
  67         {
  68                 .virtual        = IO_ADDRESS(INTEGRATOR_HDR_BASE),
  69                 .pfn            = __phys_to_pfn(INTEGRATOR_HDR_BASE),
  70                 .length         = SZ_4K,
  71                 .type           = MT_DEVICE
  72         }, {
  73                 .virtual        = IO_ADDRESS(INTEGRATOR_CT_BASE),
  74                 .pfn            = __phys_to_pfn(INTEGRATOR_CT_BASE),
  75                 .length         = SZ_4K,
  76                 .type           = MT_DEVICE
  77         }, {
  78                 .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
  79                 .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
  80                 .length         = SZ_4K,
  81                 .type           = MT_DEVICE
  82         }, {
  83                 .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
  84                 .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
  85                 .length         = SZ_4K,
  86                 .type           = MT_DEVICE
  87         }, {
  88                 .virtual        = IO_ADDRESS(INTEGRATOR_DBG_BASE),
  89                 .pfn            = __phys_to_pfn(INTEGRATOR_DBG_BASE),
  90                 .length         = SZ_4K,
  91                 .type           = MT_DEVICE
  92         }, {
  93                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_GPIO_BASE),
  94                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_GPIO_BASE),
  95                 .length         = SZ_4K,
  96                 .type           = MT_DEVICE
  97         }, {
  98                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
  99                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
 100                 .length         = SZ_4K,
 101                 .type           = MT_DEVICE
 102         }
 103 };
 104
 105 static void __init intcp_map_io(void)
 106 {
 107         iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
 108 }
 109
 110 /*
 111  * Flash handling.
 112  */
 113 static int intcp_flash_init(struct platform_device *dev)
 114 {
 115         u32 val;
 116
 117         val = readl(intcp_con_base + INTCP_FLASHPROG);
 118         val |= CINTEGRATOR_FLASHPROG_FLWREN;
 119         writel(val, intcp_con_base + INTCP_FLASHPROG);
 120
 121         return 0;
 122 }
 123
 124 static void intcp_flash_exit(struct platform_device *dev)
 125 {
 126         u32 val;
 127
 128         val = readl(intcp_con_base + INTCP_FLASHPROG);
 129         val &= ~(CINTEGRATOR_FLASHPROG_FLVPPEN|CINTEGRATOR_FLASHPROG_FLWREN);
 130         writel(val, intcp_con_base + INTCP_FLASHPROG);
 131 }
 132
 133 static void intcp_flash_set_vpp(struct platform_device *pdev, int on)
 134 {
 135         u32 val;
 136
 137         val = readl(intcp_con_base + INTCP_FLASHPROG);
 138         if (on)
 139                 val |= CINTEGRATOR_FLASHPROG_FLVPPEN;
 140         else
 141                 val &= ~CINTEGRATOR_FLASHPROG_FLVPPEN;
 142         writel(val, intcp_con_base + INTCP_FLASHPROG);
 143 }
 144
 145 static struct physmap_flash_data intcp_flash_data = {
 146         .width          = 4,
 147         .init           = intcp_flash_init,
 148         .exit           = intcp_flash_exit,
 149         .set_vpp        = intcp_flash_set_vpp,
 150 };
 151
 152 /*
 153  * It seems that the card insertion interrupt remains active after
 154  * we've acknowledged it.  We therefore ignore the interrupt, and
 155  * rely on reading it from the SIC.  This also means that we must
 156  * clear the latched interrupt.
 157  */
 158 static unsigned int mmc_status(struct device *dev)
 159 {
 160         unsigned int status = readl(__io_address(0xca000000 + 4));
 161         writel(8, intcp_con_base + 8);
 162
 163         return status & 8;
 164 }
 165
 166 static struct mmci_platform_data mmc_data = {
 167         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 168         .status         = mmc_status,
 169         .gpio_wp        = -1,
 170         .gpio_cd        = -1,
 171 };
 172
 173 /*
 174  * CLCD support
 175  */
 176 /*
 177  * Ensure VGA is selected.
 178  */
 179 static void cp_clcd_enable(struct clcd_fb *fb)
 180 {
 181         struct fb_var_screeninfo *var = &fb->fb.var;
 182         u32 val = CM_CTRL_STATIC1 | CM_CTRL_STATIC2
 183                         | CM_CTRL_LCDEN0 | CM_CTRL_LCDEN1;
 184
 185         if (var->bits_per_pixel <= 8 ||
 186             (var->bits_per_pixel == 16 && var->green.length == 5))
 187                 /* Pseudocolor, RGB555, BGR555 */
 188                 val |= CM_CTRL_LCDMUXSEL_VGA555_TFT555;
 189         else if (fb->fb.var.bits_per_pixel <= 16)
 190                 /* truecolor RGB565 */
 191                 val |= CM_CTRL_LCDMUXSEL_VGA565_TFT555;
 192         else
 193                 val = 0; /* no idea for this, don't trust the docs */
 194
 195         cm_control(CM_CTRL_LCDMUXSEL_MASK|
 196                    CM_CTRL_LCDEN0|
 197                    CM_CTRL_LCDEN1|
 198                    CM_CTRL_STATIC1|
 199                    CM_CTRL_STATIC2|
 200                    CM_CTRL_STATIC|
 201                    CM_CTRL_n24BITEN, val);
 202 }
 203
 204 static int cp_clcd_setup(struct clcd_fb *fb)
 205 {
 206         fb->panel = versatile_clcd_get_panel("VGA");
 207         if (!fb->panel)
 208                 return -EINVAL;
 209
 210         return versatile_clcd_setup_dma(fb, SZ_1M);
 211 }
 212
 213 static struct clcd_board clcd_data = {
 214         .name           = "Integrator/CP",
 215         .caps           = CLCD_CAP_5551 | CLCD_CAP_RGB565 | CLCD_CAP_888,
 216         .check          = clcdfb_check,
 217         .decode         = clcdfb_decode,
 218         .enable         = cp_clcd_enable,
 219         .setup          = cp_clcd_setup,
 220         .mmap           = versatile_clcd_mmap_dma,
 221         .remove         = versatile_clcd_remove_dma,
 222 };
 223
 224 #define REFCOUNTER (__io_address(INTEGRATOR_HDR_BASE) + 0x28)
 225
 226 static u64 notrace intcp_read_sched_clock(void)
 227 {
 228         return readl(REFCOUNTER);
 229 }
 230
 231 static void __init intcp_init_early(void)
 232 {
 233         sched_clock_register(intcp_read_sched_clock, 32, 24000000);
 234 }
 235
 236 static void __init intcp_init_irq_of(void)
 237 {
 238         cm_init();
 239         irqchip_init();
 240 }
 241
 242 /*
 243  * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
 244  * and enforce the bus names since these are used for clock lookups.
 245  */
 246 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 247         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 248                 "rtc", NULL),
 249         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
 250                 "uart0", NULL),
 251         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
 252                 "uart1", NULL),
 253         OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 254                 "kmi0", NULL),
 255         OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
 256                 "kmi1", NULL),
 257         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
 258                 "mmci", &mmc_data),
 259         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_AACI_BASE,
 260                 "aaci", &mmc_data),
 261         OF_DEV_AUXDATA("arm,primecell", INTCP_PA_CLCD_BASE,
 262                 "clcd", &clcd_data),
 263         OF_DEV_AUXDATA("cfi-flash", INTCP_PA_FLASH_BASE,
 264                 "physmap-flash", &intcp_flash_data),
 265         { /* sentinel */ },
 266 };
 267
 268 static const struct of_device_id intcp_syscon_match[] = {
 269         { .compatible = "arm,integrator-cp-syscon"},
 270         { },
 271 };
 272
 273 static void __init intcp_init_of(void)
 274 {
 275         struct device_node *cpcon;
 276
 277         cpcon = of_find_matching_node(NULL, intcp_syscon_match);
 278         if (!cpcon)
 279                 return;
 280
 281         intcp_con_base = of_iomap(cpcon, 0);
 282         if (!intcp_con_base)
 283                 return;
 284
 285         of_platform_populate(NULL, of_default_bus_match_table,
 286                              intcp_auxdata_lookup, NULL);
 287 }
 288
 289 static const char * intcp_dt_board_compat[] = {
 290         "arm,integrator-cp",
 291         NULL,
 292 };
 293
 294 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
 295         .reserve        = integrator_reserve,
 296         .map_io         = intcp_map_io,
 297         .init_early     = intcp_init_early,
 298         .init_irq       = intcp_init_irq_of,
 299         .init_machine   = intcp_init_of,
 300         .dt_compat      = intcp_dt_board_compat,
 301 MACHINE_END