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/amba/mmci.h>
  22 #include <linux/io.h>
  23 #include <linux/irqchip/versatile-fpga.h>
  24 #include <linux/gfp.h>
  25 #include <linux/mtd/physmap.h>
  26 #include <linux/platform_data/clk-integrator.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
  32 #include <mach/hardware.h>
  33 #include <mach/platform.h>
  34 #include <asm/setup.h>
  35 #include <asm/mach-types.h>
  36 #include <asm/hardware/arm_timer.h>
  37 #include <asm/hardware/icst.h>
  38
  39 #include <mach/lm.h>
  40
  41 #include <asm/mach/arch.h>
  42 #include <asm/mach/irq.h>
  43 #include <asm/mach/map.h>
  44 #include <asm/mach/time.h>
  45
  46 #include <asm/hardware/timer-sp.h>
  47
  48 #include <plat/clcd.h>
  49 #include <plat/sched_clock.h>
  50
  51 #include "cm.h"
  52 #include "common.h"
  53
  54 /* Base address to the CP controller */
  55 static void __iomem *intcp_con_base;
  56
  57 #define INTCP_PA_FLASH_BASE             0x24000000
  58
  59 #define INTCP_PA_CLCD_BASE              0xc0000000
  60
  61 #define INTCP_FLASHPROG                 0x04
  62 #define CINTEGRATOR_FLASHPROG_FLVPPEN   (1 << 0)
  63 #define CINTEGRATOR_FLASHPROG_FLWREN    (1 << 1)
  64
  65 /*
  66  * Logical      Physical
  67  * f1000000     10000000        Core module registers
  68  * f1300000     13000000        Counter/Timer
  69  * f1400000     14000000        Interrupt controller
  70  * f1600000     16000000        UART 0
  71  * f1700000     17000000        UART 1
  72  * f1a00000     1a000000        Debug LEDs
  73  * fc900000     c9000000        GPIO
  74  * fca00000     ca000000        SIC
  75  */
  76
  77 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
  78         {
  79                 .virtual        = IO_ADDRESS(INTEGRATOR_HDR_BASE),
  80                 .pfn            = __phys_to_pfn(INTEGRATOR_HDR_BASE),
  81                 .length         = SZ_4K,
  82                 .type           = MT_DEVICE
  83         }, {
  84                 .virtual        = IO_ADDRESS(INTEGRATOR_CT_BASE),
  85                 .pfn            = __phys_to_pfn(INTEGRATOR_CT_BASE),
  86                 .length         = SZ_4K,
  87                 .type           = MT_DEVICE
  88         }, {
  89                 .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
  90                 .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
  91                 .length         = SZ_4K,
  92                 .type           = MT_DEVICE
  93         }, {
  94                 .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
  95                 .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
  96                 .length         = SZ_4K,
  97                 .type           = MT_DEVICE
  98         }, {
  99                 .virtual        = IO_ADDRESS(INTEGRATOR_DBG_BASE),
 100                 .pfn            = __phys_to_pfn(INTEGRATOR_DBG_BASE),
 101                 .length         = SZ_4K,
 102                 .type           = MT_DEVICE
 103         }, {
 104                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_GPIO_BASE),
 105                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_GPIO_BASE),
 106                 .length         = SZ_4K,
 107                 .type           = MT_DEVICE
 108         }, {
 109                 .virtual        = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
 110                 .pfn            = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
 111                 .length         = SZ_4K,
 112                 .type           = MT_DEVICE
 113         }
 114 };
 115
 116 static void __init intcp_map_io(void)
 117 {
 118         iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
 119 }
 120
 121 /*
 122  * Flash handling.
 123  */
 124 static int intcp_flash_init(struct platform_device *dev)
 125 {
 126         u32 val;
 127
 128         val = readl(intcp_con_base + INTCP_FLASHPROG);
 129         val |= CINTEGRATOR_FLASHPROG_FLWREN;
 130         writel(val, intcp_con_base + INTCP_FLASHPROG);
 131
 132         return 0;
 133 }
 134
 135 static void intcp_flash_exit(struct platform_device *dev)
 136 {
 137         u32 val;
 138
 139         val = readl(intcp_con_base + INTCP_FLASHPROG);
 140         val &= ~(CINTEGRATOR_FLASHPROG_FLVPPEN|CINTEGRATOR_FLASHPROG_FLWREN);
 141         writel(val, intcp_con_base + INTCP_FLASHPROG);
 142 }
 143
 144 static void intcp_flash_set_vpp(struct platform_device *pdev, int on)
 145 {
 146         u32 val;
 147
 148         val = readl(intcp_con_base + INTCP_FLASHPROG);
 149         if (on)
 150                 val |= CINTEGRATOR_FLASHPROG_FLVPPEN;
 151         else
 152                 val &= ~CINTEGRATOR_FLASHPROG_FLVPPEN;
 153         writel(val, intcp_con_base + INTCP_FLASHPROG);
 154 }
 155
 156 static struct physmap_flash_data intcp_flash_data = {
 157         .width          = 4,
 158         .init           = intcp_flash_init,
 159         .exit           = intcp_flash_exit,
 160         .set_vpp        = intcp_flash_set_vpp,
 161 };
 162
 163 /*
 164  * It seems that the card insertion interrupt remains active after
 165  * we've acknowledged it.  We therefore ignore the interrupt, and
 166  * rely on reading it from the SIC.  This also means that we must
 167  * clear the latched interrupt.
 168  */
 169 static unsigned int mmc_status(struct device *dev)
 170 {
 171         unsigned int status = readl(__io_address(0xca000000 + 4));
 172         writel(8, intcp_con_base + 8);
 173
 174         return status & 8;
 175 }
 176
 177 static struct mmci_platform_data mmc_data = {
 178         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 179         .status         = mmc_status,
 180         .gpio_wp        = -1,
 181         .gpio_cd        = -1,
 182 };
 183
 184 /*
 185  * CLCD support
 186  */
 187 /*
 188  * Ensure VGA is selected.
 189  */
 190 static void cp_clcd_enable(struct clcd_fb *fb)
 191 {
 192         struct fb_var_screeninfo *var = &fb->fb.var;
 193         u32 val = CM_CTRL_STATIC1 | CM_CTRL_STATIC2
 194                         | CM_CTRL_LCDEN0 | CM_CTRL_LCDEN1;
 195
 196         if (var->bits_per_pixel <= 8 ||
 197             (var->bits_per_pixel == 16 && var->green.length == 5))
 198                 /* Pseudocolor, RGB555, BGR555 */
 199                 val |= CM_CTRL_LCDMUXSEL_VGA555_TFT555;
 200         else if (fb->fb.var.bits_per_pixel <= 16)
 201                 /* truecolor RGB565 */
 202                 val |= CM_CTRL_LCDMUXSEL_VGA565_TFT555;
 203         else
 204                 val = 0; /* no idea for this, don't trust the docs */
 205
 206         cm_control(CM_CTRL_LCDMUXSEL_MASK|
 207                    CM_CTRL_LCDEN0|
 208                    CM_CTRL_LCDEN1|
 209                    CM_CTRL_STATIC1|
 210                    CM_CTRL_STATIC2|
 211                    CM_CTRL_STATIC|
 212                    CM_CTRL_n24BITEN, val);
 213 }
 214
 215 static int cp_clcd_setup(struct clcd_fb *fb)
 216 {
 217         fb->panel = versatile_clcd_get_panel("VGA");
 218         if (!fb->panel)
 219                 return -EINVAL;
 220
 221         return versatile_clcd_setup_dma(fb, SZ_1M);
 222 }
 223
 224 static struct clcd_board clcd_data = {
 225         .name           = "Integrator/CP",
 226         .caps           = CLCD_CAP_5551 | CLCD_CAP_RGB565 | CLCD_CAP_888,
 227         .check          = clcdfb_check,
 228         .decode         = clcdfb_decode,
 229         .enable         = cp_clcd_enable,
 230         .setup          = cp_clcd_setup,
 231         .mmap           = versatile_clcd_mmap_dma,
 232         .remove         = versatile_clcd_remove_dma,
 233 };
 234
 235 #define REFCOUNTER (__io_address(INTEGRATOR_HDR_BASE) + 0x28)
 236
 237 static void __init intcp_init_early(void)
 238 {
 239 #ifdef CONFIG_PLAT_VERSATILE_SCHED_CLOCK
 240         versatile_sched_clock_init(REFCOUNTER, 24000000);
 241 #endif
 242 }
 243
 244 static const struct of_device_id fpga_irq_of_match[] __initconst = {
 245         { .compatible = "arm,versatile-fpga-irq", .data = fpga_irq_of_init, },
 246         { /* Sentinel */ }
 247 };
 248
 249 static void __init intcp_init_irq_of(void)
 250 {
 251         cm_init();
 252         of_irq_init(fpga_irq_of_match);
 253         integrator_clk_init(true);
 254 }
 255
 256 /*
 257  * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
 258  * and enforce the bus names since these are used for clock lookups.
 259  */
 260 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 261         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 262                 "rtc", NULL),
 263         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
 264                 "uart0", NULL),
 265         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
 266                 "uart1", NULL),
 267         OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 268                 "kmi0", NULL),
 269         OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
 270                 "kmi1", NULL),
 271         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
 272                 "mmci", &mmc_data),
 273         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_AACI_BASE,
 274                 "aaci", &mmc_data),
 275         OF_DEV_AUXDATA("arm,primecell", INTCP_PA_CLCD_BASE,
 276                 "clcd", &clcd_data),
 277         OF_DEV_AUXDATA("cfi-flash", INTCP_PA_FLASH_BASE,
 278                 "physmap-flash", &intcp_flash_data),
 279         { /* sentinel */ },
 280 };
 281
 282 static const struct of_device_id intcp_syscon_match[] = {
 283         { .compatible = "arm,integrator-cp-syscon"},
 284         { },
 285 };
 286
 287 static void __init intcp_init_of(void)
 288 {
 289         struct device_node *root;
 290         struct device_node *cpcon;
 291         struct device *parent;
 292         struct soc_device *soc_dev;
 293         struct soc_device_attribute *soc_dev_attr;
 294         u32 intcp_sc_id;
 295         int err;
 296
 297         /* Here we create an SoC device for the root node */
 298         root = of_find_node_by_path("/");
 299         if (!root)
 300                 return;
 301
 302         cpcon = of_find_matching_node(root, intcp_syscon_match);
 303         if (!cpcon)
 304                 return;
 305
 306         intcp_con_base = of_iomap(cpcon, 0);
 307         if (!intcp_con_base)
 308                 return;
 309
 310         intcp_sc_id = readl(intcp_con_base);
 311
 312         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 313         if (!soc_dev_attr)
 314                 return;
 315
 316         err = of_property_read_string(root, "compatible",
 317                                       &soc_dev_attr->soc_id);
 318         if (err)
 319                 return;
 320         err = of_property_read_string(root, "model", &soc_dev_attr->machine);
 321         if (err)
 322                 return;
 323         soc_dev_attr->family = "Integrator";
 324         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c",
 325                                            'A' + (intcp_sc_id & 0x0f));
 326
 327         soc_dev = soc_device_register(soc_dev_attr);
 328         if (IS_ERR(soc_dev)) {
 329                 kfree(soc_dev_attr->revision);
 330                 kfree(soc_dev_attr);
 331                 return;
 332         }
 333
 334         parent = soc_device_to_device(soc_dev);
 335         integrator_init_sysfs(parent, intcp_sc_id);
 336         of_platform_populate(root, of_default_bus_match_table,
 337                         intcp_auxdata_lookup, parent);
 338 }
 339
 340 static const char * intcp_dt_board_compat[] = {
 341         "arm,integrator-cp",
 342         NULL,
 343 };
 344
 345 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
 346         .reserve        = integrator_reserve,
 347         .map_io         = intcp_map_io,
 348         .init_early     = intcp_init_early,
 349         .init_irq       = intcp_init_irq_of,
 350         .handle_irq     = fpga_handle_irq,
 351         .init_machine   = intcp_init_of,
 352         .restart        = integrator_restart,
 353         .dt_compat      = intcp_dt_board_compat,
 354 MACHINE_END