arch/powerpc/platforms/85xx/p1022_ds.c

   1 /*
   2  * P1022DS board specific routines
   3  *
   4  * Authors: Travis Wheatley <travis.wheatley@freescale.com>
   5  *          Dave Liu <daveliu@freescale.com>
   6  *          Timur Tabi <timur@freescale.com>
   7  *
   8  * Copyright 2010 Freescale Semiconductor, Inc.
   9  *
  10  * This file is taken from the Freescale P1022DS BSP, with modifications:
  11  * 2) No AMP support
  12  * 3) No PCI endpoint support
  13  *
  14  * This file is licensed under the terms of the GNU General Public License
  15  * version 2.  This program is licensed "as is" without any warranty of any
  16  * kind, whether express or implied.
  17  */
  18
  19 #include <linux/pci.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/memblock.h>
  22 #include <asm/div64.h>
  23 #include <asm/mpic.h>
  24 #include <asm/swiotlb.h>
  25
  26 #include <sysdev/fsl_soc.h>
  27 #include <sysdev/fsl_pci.h>
  28 #include <asm/fsl_guts.h>
  29
  30 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
  31
  32 /*
  33  * Board-specific initialization of the DIU.  This code should probably be
  34  * executed when the DIU is opened, rather than in arch code, but the DIU
  35  * driver does not have a mechanism for this (yet).
  36  *
  37  * This is especially problematic on the P1022DS because the local bus (eLBC)
  38  * and the DIU video signals share the same pins, which means that enabling the
  39  * DIU will disable access to NOR flash.
  40  */
  41
  42 /* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */
  43 #define CLKDVDR_PXCKEN          0x80000000
  44 #define CLKDVDR_PXCKINV         0x10000000
  45 #define CLKDVDR_PXCKDLY         0x06000000
  46 #define CLKDVDR_PXCLK_MASK      0x00FF0000
  47
  48 /* Some ngPIXIS register definitions */
  49 #define PX_BRDCFG1_DVIEN        0x80
  50 #define PX_BRDCFG1_DFPEN        0x40
  51 #define PX_BRDCFG1_BACKLIGHT    0x20
  52 #define PX_BRDCFG1_DDCEN        0x10
  53
  54 /*
  55  * DIU Area Descriptor
  56  *
  57  * Note that we need to byte-swap the value before it's written to the AD
  58  * register.  So even though the registers don't look like they're in the same
  59  * bit positions as they are on the MPC8610, the same value is written to the
  60  * AD register on the MPC8610 and on the P1022.
  61  */
  62 #define AD_BYTE_F               0x10000000
  63 #define AD_ALPHA_C_MASK         0x0E000000
  64 #define AD_ALPHA_C_SHIFT        25
  65 #define AD_BLUE_C_MASK          0x01800000
  66 #define AD_BLUE_C_SHIFT         23
  67 #define AD_GREEN_C_MASK         0x00600000
  68 #define AD_GREEN_C_SHIFT        21
  69 #define AD_RED_C_MASK           0x00180000
  70 #define AD_RED_C_SHIFT          19
  71 #define AD_PALETTE              0x00040000
  72 #define AD_PIXEL_S_MASK         0x00030000
  73 #define AD_PIXEL_S_SHIFT        16
  74 #define AD_COMP_3_MASK          0x0000F000
  75 #define AD_COMP_3_SHIFT         12
  76 #define AD_COMP_2_MASK          0x00000F00
  77 #define AD_COMP_2_SHIFT         8
  78 #define AD_COMP_1_MASK          0x000000F0
  79 #define AD_COMP_1_SHIFT         4
  80 #define AD_COMP_0_MASK          0x0000000F
  81 #define AD_COMP_0_SHIFT         0
  82
  83 #define MAKE_AD(alpha, red, blue, green, size, c0, c1, c2, c3) \
  84         cpu_to_le32(AD_BYTE_F | (alpha << AD_ALPHA_C_SHIFT) | \
  85         (blue << AD_BLUE_C_SHIFT) | (green << AD_GREEN_C_SHIFT) | \
  86         (red << AD_RED_C_SHIFT) | (c3 << AD_COMP_3_SHIFT) | \
  87         (c2 << AD_COMP_2_SHIFT) | (c1 << AD_COMP_1_SHIFT) | \
  88         (c0 << AD_COMP_0_SHIFT) | (size << AD_PIXEL_S_SHIFT))
  89
  90 /**
  91  * p1022ds_get_pixel_format: return the Area Descriptor for a given pixel depth
  92  *
  93  * The Area Descriptor is a 32-bit value that determine which bits in each
  94  * pixel are to be used for each color.
  95  */
  96 static unsigned int p1022ds_get_pixel_format(unsigned int bits_per_pixel,
  97         int monitor_port)
  98 {
  99         switch (bits_per_pixel) {
 100         case 32:
 101                 /* 0x88883316 */
 102                 return MAKE_AD(3, 2, 0, 1, 3, 8, 8, 8, 8);
 103         case 24:
 104                 /* 0x88082219 */
 105                 return MAKE_AD(4, 0, 1, 2, 2, 0, 8, 8, 8);
 106         case 16:
 107                 /* 0x65053118 */
 108                 return MAKE_AD(4, 2, 1, 0, 1, 5, 6, 5, 0);
 109         default:
 110                 pr_err("fsl-diu: unsupported pixel depth %u\n", bits_per_pixel);
 111                 return 0;
 112         }
 113 }
 114
 115 /**
 116  * p1022ds_set_gamma_table: update the gamma table, if necessary
 117  *
 118  * On some boards, the gamma table for some ports may need to be modified.
 119  * This is not the case on the P1022DS, so we do nothing.
 120 */
 121 static void p1022ds_set_gamma_table(int monitor_port, char *gamma_table_base)
 122 {
 123 }
 124
 125 /**
 126  * p1022ds_set_monitor_port: switch the output to a different monitor port
 127  *
 128  */
 129 static void p1022ds_set_monitor_port(int monitor_port)
 130 {
 131         struct device_node *pixis_node;
 132         void __iomem *pixis;
 133         u8 __iomem *brdcfg1;
 134
 135         pixis_node = of_find_compatible_node(NULL, NULL, "fsl,p1022ds-pixis");
 136         if (!pixis_node) {
 137                 pr_err("p1022ds: missing ngPIXIS node\n");
 138                 return;
 139         }
 140
 141         pixis = of_iomap(pixis_node, 0);
 142         if (!pixis) {
 143                 pr_err("p1022ds: could not map ngPIXIS registers\n");
 144                 return;
 145         }
 146         brdcfg1 = pixis + 9;    /* BRDCFG1 is at offset 9 in the ngPIXIS */
 147
 148         switch (monitor_port) {
 149         case 0: /* DVI */
 150                 /* Enable the DVI port, disable the DFP and the backlight */
 151                 clrsetbits_8(brdcfg1, PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT,
 152                              PX_BRDCFG1_DVIEN);
 153                 break;
 154         case 1: /* Single link LVDS */
 155                 /* Enable the DFP port, disable the DVI and the backlight */
 156                 clrsetbits_8(brdcfg1, PX_BRDCFG1_DVIEN | PX_BRDCFG1_BACKLIGHT,
 157                              PX_BRDCFG1_DFPEN);
 158                 break;
 159         default:
 160                 pr_err("p1022ds: unsupported monitor port %i\n", monitor_port);
 161         }
 162
 163         iounmap(pixis);
 164 }
 165
 166 /**
 167  * p1022ds_set_pixel_clock: program the DIU's clock
 168  *
 169  * @pixclock: the wavelength, in picoseconds, of the clock
 170  */
 171 void p1022ds_set_pixel_clock(unsigned int pixclock)
 172 {
 173         struct device_node *guts_np = NULL;
 174         struct ccsr_guts_85xx __iomem *guts;
 175         unsigned long freq;
 176         u64 temp;
 177         u32 pxclk;
 178
 179         /* Map the global utilities registers. */
 180         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 181         if (!guts_np) {
 182                 pr_err("p1022ds: missing global utilties device node\n");
 183                 return;
 184         }
 185
 186         guts = of_iomap(guts_np, 0);
 187         of_node_put(guts_np);
 188         if (!guts) {
 189                 pr_err("p1022ds: could not map global utilties device\n");
 190                 return;
 191         }
 192
 193         /* Convert pixclock from a wavelength to a frequency */
 194         temp = 1000000000000ULL;
 195         do_div(temp, pixclock);
 196         freq = temp;
 197
 198         /*
 199          * 'pxclk' is the ratio of the platform clock to the pixel clock.
 200          * This number is programmed into the CLKDVDR register, and the valid
 201          * range of values is 2-255.
 202          */
 203         pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq);
 204         pxclk = clamp_t(u32, pxclk, 2, 255);
 205
 206         /* Disable the pixel clock, and set it to non-inverted and no delay */
 207         clrbits32(&guts->clkdvdr,
 208                   CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK);
 209
 210         /* Enable the clock and set the pxclk */
 211         setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16));
 212
 213         iounmap(guts);
 214 }
 215
 216 /**
 217  * p1022ds_show_monitor_port: show the current monitor
 218  *
 219  * This function returns a string indicating whether the current monitor is
 220  * set to DVI or LVDS.
 221  */
 222 ssize_t p1022ds_show_monitor_port(int monitor_port, char *buf)
 223 {
 224         return sprintf(buf, "%c0 - DVI\n%c1 - Single link LVDS\n",
 225                 monitor_port == 0 ? '*' : ' ', monitor_port == 1 ? '*' : ' ');
 226 }
 227
 228 /**
 229  * p1022ds_set_sysfs_monitor_port: set the monitor port for sysfs
 230  */
 231 int p1022ds_set_sysfs_monitor_port(int val)
 232 {
 233         return val < 2 ? val : 0;
 234 }
 235
 236 #endif
 237
 238 void __init p1022_ds_pic_init(void)
 239 {
 240         struct mpic *mpic;
 241         struct resource r;
 242         struct device_node *np;
 243
 244         np = of_find_node_by_type(NULL, "open-pic");
 245         if (!np) {
 246                 pr_err("Could not find open-pic node\n");
 247                 return;
 248         }
 249
 250         if (of_address_to_resource(np, 0, &r)) {
 251                 pr_err("Failed to map mpic register space\n");
 252                 of_node_put(np);
 253                 return;
 254         }
 255
 256         mpic = mpic_alloc(np, r.start,
 257                 MPIC_PRIMARY | MPIC_WANTS_RESET |
 258                 MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
 259                 MPIC_SINGLE_DEST_CPU,
 260                 0, 256, " OpenPIC  ");
 261
 262         BUG_ON(mpic == NULL);
 263         of_node_put(np);
 264
 265         mpic_init(mpic);
 266 }
 267
 268 #ifdef CONFIG_SMP
 269 void __init mpc85xx_smp_init(void);
 270 #endif
 271
 272 /*
 273  * Setup the architecture
 274  */
 275 static void __init p1022_ds_setup_arch(void)
 276 {
 277 #ifdef CONFIG_PCI
 278         struct device_node *np;
 279 #endif
 280         dma_addr_t max = 0xffffffff;
 281
 282         if (ppc_md.progress)
 283                 ppc_md.progress("p1022_ds_setup_arch()", 0);
 284
 285 #ifdef CONFIG_PCI
 286         for_each_compatible_node(np, "pci", "fsl,p1022-pcie") {
 287                 struct resource rsrc;
 288                 struct pci_controller *hose;
 289
 290                 of_address_to_resource(np, 0, &rsrc);
 291
 292                 if ((rsrc.start & 0xfffff) == 0x8000)
 293                         fsl_add_bridge(np, 1);
 294                 else
 295                         fsl_add_bridge(np, 0);
 296
 297                 hose = pci_find_hose_for_OF_device(np);
 298                 max = min(max, hose->dma_window_base_cur +
 299                           hose->dma_window_size);
 300         }
 301 #endif
 302
 303 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
 304         diu_ops.get_pixel_format        = p1022ds_get_pixel_format;
 305         diu_ops.set_gamma_table         = p1022ds_set_gamma_table;
 306         diu_ops.set_monitor_port        = p1022ds_set_monitor_port;
 307         diu_ops.set_pixel_clock         = p1022ds_set_pixel_clock;
 308         diu_ops.show_monitor_port       = p1022ds_show_monitor_port;
 309         diu_ops.set_sysfs_monitor_port  = p1022ds_set_sysfs_monitor_port;
 310 #endif
 311
 312 #ifdef CONFIG_SMP
 313         mpc85xx_smp_init();
 314 #endif
 315
 316 #ifdef CONFIG_SWIOTLB
 317         if (memblock_end_of_DRAM() > max) {
 318                 ppc_swiotlb_enable = 1;
 319                 set_pci_dma_ops(&swiotlb_dma_ops);
 320                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 321         }
 322 #endif
 323
 324         pr_info("Freescale P1022 DS reference board\n");
 325 }
 326
 327 static struct of_device_id __initdata p1022_ds_ids[] = {
 328         { .type = "soc", },
 329         { .compatible = "soc", },
 330         { .compatible = "simple-bus", },
 331         { .compatible = "gianfar", },
 332         /* So that the DMA channel nodes can be probed individually: */
 333         { .compatible = "fsl,eloplus-dma", },
 334         {},
 335 };
 336
 337 static int __init p1022_ds_publish_devices(void)
 338 {
 339         return of_platform_bus_probe(NULL, p1022_ds_ids, NULL);
 340 }
 341 machine_device_initcall(p1022_ds, p1022_ds_publish_devices);
 342
 343 machine_arch_initcall(p1022_ds, swiotlb_setup_bus_notifier);
 344
 345 /*
 346  * Called very early, device-tree isn't unflattened
 347  */
 348 static int __init p1022_ds_probe(void)
 349 {
 350         unsigned long root = of_get_flat_dt_root();
 351
 352         return of_flat_dt_is_compatible(root, "fsl,p1022ds");
 353 }
 354
 355 define_machine(p1022_ds) {
 356         .name                   = "P1022 DS",
 357         .probe                  = p1022_ds_probe,
 358         .setup_arch             = p1022_ds_setup_arch,
 359         .init_IRQ               = p1022_ds_pic_init,
 360 #ifdef CONFIG_PCI
 361         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 362 #endif
 363         .get_irq                = mpic_get_irq,
 364         .restart                = fsl_rstcr_restart,
 365         .calibrate_decr         = generic_calibrate_decr,
 366         .progress               = udbg_progress,
 367 };