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/sys_soc.h>
  31 #include <linux/sched_clock.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/mach-types.h>
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/irq.h>
  37 #include <asm/mach/map.h>
  38 #include <asm/mach/time.h>
  39
  40 #include "hardware.h"
  41 #include "cm.h"
  42 #include "common.h"
  43
  44 /* Base address to the CP controller */
  45 static void __iomem *intcp_con_base;
  46
  47 #define INTCP_PA_FLASH_BASE             0x24000000
  48
  49 #define INTCP_PA_CLCD_BASE              0xc0000000
  50
  51 #define INTCP_FLASHPROG                 0x04
  52 #define CINTEGRATOR_FLASHPROG_FLVPPEN   (1 << 0)
  53 #define CINTEGRATOR_FLASHPROG_FLWREN    (1 << 1)
  54
  55 /*
  56  * Logical      Physical
  57  * f1000000     10000000        Core module registers
  58  * f1300000     13000000        Counter/Timer
  59  * f1400000     14000000        Interrupt controller
  60  * f1600000     16000000        UART 0
  61  * f1700000     17000000        UART 1
  62  * f1a00000     1a000000        Debug LEDs
  63  * fc900000     c9000000        GPIO
  64  * fca00000     ca000000        SIC
  65  */
  66
  67 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
  68         {
  69                 .virtual        = IO_ADDRESS(INTEGRATOR_HDR_BASE),
  70                 .pfn            = __phys_to_pfn(INTEGRATOR_HDR_BASE),
  71                 .length         = SZ_4K,
  72                 .type           = MT_DEVICE
  73         }, {
  74                 .virtual        = IO_ADDRESS(INTEGRATOR_CT_BASE),
  75                 .pfn            = __phys_to_pfn(INTEGRATOR_CT_BASE),
  76                 .length         = SZ_4K,
  77                 .type           = MT_DEVICE
  78         }, {
  79                 .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
  80                 .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
  81                 .length         = SZ_4K,
  82                 .type           = MT_DEVICE
  83         }, {
  84                 .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
  85                 .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
  86                 .length         = SZ_4K,
  87                 .type           = MT_DEVICE
  88         }, {
  89                 .virtual        = IO_ADDRESS(INTEGRATOR_DBG_BASE),
  90                 .pfn            = __phys_to_pfn(INTEGRATOR_DBG_BASE),
  91                 .length         = SZ_4K,
  92                 .type           = MT_DEVICE
  93         }, {
  94                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_GPIO_BASE),
  95                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_GPIO_BASE),
  96                 .length         = SZ_4K,
  97                 .type           = MT_DEVICE
  98         }, {
  99                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
 100                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
 101                 .length         = SZ_4K,
 102                 .type           = MT_DEVICE
 103         }
 104 };
 105
 106 static void __init intcp_map_io(void)
 107 {
 108         iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
 109 }
 110
 111 /*
 112  * Flash handling.
 113  */
 114 static int intcp_flash_init(struct platform_device *dev)
 115 {
 116         u32 val;
 117
 118         val = readl(intcp_con_base + INTCP_FLASHPROG);
 119         val |= CINTEGRATOR_FLASHPROG_FLWREN;
 120         writel(val, intcp_con_base + INTCP_FLASHPROG);
 121
 122         return 0;
 123 }
 124
 125 static void intcp_flash_exit(struct platform_device *dev)
 126 {
 127         u32 val;
 128
 129         val = readl(intcp_con_base + INTCP_FLASHPROG);
 130         val &= ~(CINTEGRATOR_FLASHPROG_FLVPPEN|CINTEGRATOR_FLASHPROG_FLWREN);
 131         writel(val, intcp_con_base + INTCP_FLASHPROG);
 132 }
 133
 134 static void intcp_flash_set_vpp(struct platform_device *pdev, int on)
 135 {
 136         u32 val;
 137
 138         val = readl(intcp_con_base + INTCP_FLASHPROG);
 139         if (on)
 140                 val |= CINTEGRATOR_FLASHPROG_FLVPPEN;
 141         else
 142                 val &= ~CINTEGRATOR_FLASHPROG_FLVPPEN;
 143         writel(val, intcp_con_base + INTCP_FLASHPROG);
 144 }
 145
 146 static struct physmap_flash_data intcp_flash_data = {
 147         .width          = 4,
 148         .init           = intcp_flash_init,
 149         .exit           = intcp_flash_exit,
 150         .set_vpp        = intcp_flash_set_vpp,
 151 };
 152
 153 /*
 154  * It seems that the card insertion interrupt remains active after
 155  * we've acknowledged it.  We therefore ignore the interrupt, and
 156  * rely on reading it from the SIC.  This also means that we must
 157  * clear the latched interrupt.
 158  */
 159 static unsigned int mmc_status(struct device *dev)
 160 {
 161         unsigned int status = readl(__io_address(0xca000000 + 4));
 162         writel(8, intcp_con_base + 8);
 163
 164         return status & 8;
 165 }
 166
 167 static struct mmci_platform_data mmc_data = {
 168         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 169         .status         = mmc_status,
 170         .gpio_wp        = -1,
 171         .gpio_cd        = -1,
 172 };
 173
 174 /*
 175  * CLCD support
 176  */
 177 /*
 178  * Ensure VGA is selected.
 179  */
 180 static void cp_clcd_enable(struct clcd_fb *fb)
 181 {
 182         struct fb_var_screeninfo *var = &fb->fb.var;
 183         u32 val = CM_CTRL_STATIC1 | CM_CTRL_STATIC2
 184                         | CM_CTRL_LCDEN0 | CM_CTRL_LCDEN1;
 185
 186         if (var->bits_per_pixel <= 8 ||
 187             (var->bits_per_pixel == 16 && var->green.length == 5))
 188                 /* Pseudocolor, RGB555, BGR555 */
 189                 val |= CM_CTRL_LCDMUXSEL_VGA555_TFT555;
 190         else if (fb->fb.var.bits_per_pixel <= 16)
 191                 /* truecolor RGB565 */
 192                 val |= CM_CTRL_LCDMUXSEL_VGA565_TFT555;
 193         else
 194                 val = 0; /* no idea for this, don't trust the docs */
 195
 196         cm_control(CM_CTRL_LCDMUXSEL_MASK|
 197                    CM_CTRL_LCDEN0|
 198                    CM_CTRL_LCDEN1|
 199                    CM_CTRL_STATIC1|
 200                    CM_CTRL_STATIC2|
 201                    CM_CTRL_STATIC|
 202                    CM_CTRL_n24BITEN, val);
 203 }
 204
 205 static int cp_clcd_setup(struct clcd_fb *fb)
 206 {
 207         fb->panel = versatile_clcd_get_panel("VGA");
 208         if (!fb->panel)
 209                 return -EINVAL;
 210
 211         return versatile_clcd_setup_dma(fb, SZ_1M);
 212 }
 213
 214 static struct clcd_board clcd_data = {
 215         .name           = "Integrator/CP",
 216         .caps           = CLCD_CAP_5551 | CLCD_CAP_RGB565 | CLCD_CAP_888,
 217         .check          = clcdfb_check,
 218         .decode         = clcdfb_decode,
 219         .enable         = cp_clcd_enable,
 220         .setup          = cp_clcd_setup,
 221         .mmap           = versatile_clcd_mmap_dma,
 222         .remove         = versatile_clcd_remove_dma,
 223 };
 224
 225 #define REFCOUNTER (__io_address(INTEGRATOR_HDR_BASE) + 0x28)
 226
 227 static u64 notrace intcp_read_sched_clock(void)
 228 {
 229         return readl(REFCOUNTER);
 230 }
 231
 232 static void __init intcp_init_early(void)
 233 {
 234         sched_clock_register(intcp_read_sched_clock, 32, 24000000);
 235 }
 236
 237 static void __init intcp_init_irq_of(void)
 238 {
 239         cm_init();
 240         irqchip_init();
 241 }
 242
 243 /*
 244  * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
 245  * and enforce the bus names since these are used for clock lookups.
 246  */
 247 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 248         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 249                 "rtc", NULL),
 250         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
 251                 "uart0", NULL),
 252         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
 253                 "uart1", NULL),
 254         OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 255                 "kmi0", NULL),
 256         OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
 257                 "kmi1", NULL),
 258         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
 259                 "mmci", &mmc_data),
 260         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_AACI_BASE,
 261                 "aaci", &mmc_data),
 262         OF_DEV_AUXDATA("arm,primecell", INTCP_PA_CLCD_BASE,
 263                 "clcd", &clcd_data),
 264         OF_DEV_AUXDATA("cfi-flash", INTCP_PA_FLASH_BASE,
 265                 "physmap-flash", &intcp_flash_data),
 266         { /* sentinel */ },
 267 };
 268
 269 static const struct of_device_id intcp_syscon_match[] = {
 270         { .compatible = "arm,integrator-cp-syscon"},
 271         { },
 272 };
 273
 274 static void __init intcp_init_of(void)
 275 {
 276         struct device_node *cpcon;
 277         struct device *parent;
 278         struct soc_device *soc_dev;
 279         struct soc_device_attribute *soc_dev_attr;
 280         u32 intcp_sc_id;
 281
 282         cpcon = of_find_matching_node(NULL, intcp_syscon_match);
 283         if (!cpcon)
 284                 return;
 285
 286         intcp_con_base = of_iomap(cpcon, 0);
 287         if (!intcp_con_base)
 288                 return;
 289
 290         of_platform_populate(NULL, of_default_bus_match_table,
 291                              intcp_auxdata_lookup, NULL);
 292
 293         intcp_sc_id = readl(intcp_con_base);
 294
 295         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 296         if (!soc_dev_attr)
 297                 return;
 298
 299         soc_dev_attr->soc_id = "XCV";
 300         soc_dev_attr->machine = "Integrator/CP";
 301         soc_dev_attr->family = "Integrator";
 302         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c",
 303                                            'A' + (intcp_sc_id & 0x0f));
 304
 305         soc_dev = soc_device_register(soc_dev_attr);
 306         if (IS_ERR(soc_dev)) {
 307                 kfree(soc_dev_attr->revision);
 308                 kfree(soc_dev_attr);
 309                 return;
 310         }
 311
 312         parent = soc_device_to_device(soc_dev);
 313         integrator_init_sysfs(parent, intcp_sc_id);
 314 }
 315
 316 static const char * intcp_dt_board_compat[] = {
 317         "arm,integrator-cp",
 318         NULL,
 319 };
 320
 321 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
 322         .reserve        = integrator_reserve,
 323         .map_io         = intcp_map_io,
 324         .init_early     = intcp_init_early,
 325         .init_irq       = intcp_init_irq_of,
 326         .init_machine   = intcp_init_of,
 327         .restart        = integrator_restart,
 328         .dt_compat      = intcp_dt_board_compat,
 329 MACHINE_END