arch/mips/netlogic/xlr/platform-flash.c

   1 /*
   2  * Copyright 2011, Netlogic Microsystems.
   3  * Copyright 2004, Matt Porter <mporter@kernel.crashing.org>
   4  *
   5  * This file is licensed under the terms of the GNU General Public
   6  * License version 2.  This program is licensed "as is" without any
   7  * warranty of any kind, whether express or implied.
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/delay.h>
  16 #include <linux/ioport.h>
  17 #include <linux/resource.h>
  18 #include <linux/spi/flash.h>
  19
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/physmap.h>
  22 #include <linux/mtd/rawnand.h>
  23 #include <linux/mtd/partitions.h>
  24
  25 #include <asm/netlogic/haldefs.h>
  26 #include <asm/netlogic/xlr/iomap.h>
  27 #include <asm/netlogic/xlr/flash.h>
  28 #include <asm/netlogic/xlr/bridge.h>
  29 #include <asm/netlogic/xlr/gpio.h>
  30 #include <asm/netlogic/xlr/xlr.h>
  31
  32 /*
  33  * Default NOR partition layout
  34  */
  35 static struct mtd_partition xlr_nor_parts[] = {
  36         {
  37                 .name = "User FS",
  38                 .offset = 0x800000,
  39                 .size   = MTDPART_SIZ_FULL,
  40         }
  41 };
  42
  43 /*
  44  * Default NAND partition layout
  45  */
  46 static struct mtd_partition xlr_nand_parts[] = {
  47         {
  48                 .name   = "Root Filesystem",
  49                 .offset = 64 * 64 * 2048,
  50                 .size   = 432 * 64 * 2048,
  51         },
  52         {
  53                 .name   = "Home Filesystem",
  54                 .offset = MTDPART_OFS_APPEND,
  55                 .size   = MTDPART_SIZ_FULL,
  56         },
  57 };
  58
  59 /* Use PHYSMAP flash for NOR */
  60 struct physmap_flash_data xlr_nor_data = {
  61         .width          = 2,
  62         .parts          = xlr_nor_parts,
  63         .nr_parts       = ARRAY_SIZE(xlr_nor_parts),
  64 };
  65
  66 static struct resource xlr_nor_res[] = {
  67         {
  68                 .flags  = IORESOURCE_MEM,
  69         },
  70 };
  71
  72 static struct platform_device xlr_nor_dev = {
  73         .name   = "physmap-flash",
  74         .dev    = {
  75                 .platform_data  = &xlr_nor_data,
  76         },
  77         .num_resources  = ARRAY_SIZE(xlr_nor_res),
  78         .resource       = xlr_nor_res,
  79 };
  80
  81 /*
  82  * Use "gen_nand" driver for NAND flash
  83  *
  84  * There seems to be no way to store a private pointer containing
  85  * platform specific info in gen_nand drivier. We will use a global
  86  * struct for now, since we currently have only one NAND chip per board.
  87  */
  88 struct xlr_nand_flash_priv {
  89         int cs;
  90         uint64_t flash_mmio;
  91 };
  92
  93 static struct xlr_nand_flash_priv nand_priv;
  94
  95 static void xlr_nand_ctrl(struct mtd_info *mtd, int cmd,
  96                 unsigned int ctrl)
  97 {
  98         if (ctrl & NAND_CLE)
  99                 nlm_write_reg(nand_priv.flash_mmio,
 100                         FLASH_NAND_CLE(nand_priv.cs), cmd);
 101         else if (ctrl & NAND_ALE)
 102                 nlm_write_reg(nand_priv.flash_mmio,
 103                         FLASH_NAND_ALE(nand_priv.cs), cmd);
 104 }
 105
 106 struct platform_nand_data xlr_nand_data = {
 107         .chip = {
 108                 .nr_chips       = 1,
 109                 .nr_partitions  = ARRAY_SIZE(xlr_nand_parts),
 110                 .chip_delay     = 50,
 111                 .partitions     = xlr_nand_parts,
 112         },
 113         .ctrl = {
 114                 .cmd_ctrl       = xlr_nand_ctrl,
 115         },
 116 };
 117
 118 static struct resource xlr_nand_res[] = {
 119         {
 120                 .flags          = IORESOURCE_MEM,
 121         },
 122 };
 123
 124 static struct platform_device xlr_nand_dev = {
 125         .name           = "gen_nand",
 126         .id             = -1,
 127         .num_resources  = ARRAY_SIZE(xlr_nand_res),
 128         .resource       = xlr_nand_res,
 129         .dev            = {
 130                 .platform_data  = &xlr_nand_data,
 131         }
 132 };
 133
 134 /*
 135  * XLR/XLS supports upto 8 devices on its FLASH interface. The value in
 136  * FLASH_BAR (on the MEM/IO bridge) gives the base for mapping all the
 137  * flash devices.
 138  * Under this, each flash device has an offset and size given by the
 139  * CSBASE_ADDR and CSBASE_MASK registers for the device.
 140  *
 141  * The CSBASE_ registers are expected to be setup by the bootloader.
 142  */
 143 static void setup_flash_resource(uint64_t flash_mmio,
 144         uint64_t flash_map_base, int cs, struct resource *res)
 145 {
 146         u32 base, mask;
 147
 148         base = nlm_read_reg(flash_mmio, FLASH_CSBASE_ADDR(cs));
 149         mask = nlm_read_reg(flash_mmio, FLASH_CSADDR_MASK(cs));
 150
 151         res->start = flash_map_base + ((unsigned long)base << 16);
 152         res->end = res->start + (mask + 1) * 64 * 1024;
 153 }
 154
 155 static int __init xlr_flash_init(void)
 156 {
 157         uint64_t gpio_mmio, flash_mmio, flash_map_base;
 158         u32 gpio_resetcfg, flash_bar;
 159         int cs, boot_nand, boot_nor;
 160
 161         /* Flash address bits 39:24 is in bridge flash BAR */
 162         flash_bar = nlm_read_reg(nlm_io_base, BRIDGE_FLASH_BAR);
 163         flash_map_base = (flash_bar & 0xffff0000) << 8;
 164
 165         gpio_mmio = nlm_mmio_base(NETLOGIC_IO_GPIO_OFFSET);
 166         flash_mmio = nlm_mmio_base(NETLOGIC_IO_FLASH_OFFSET);
 167
 168         /* Get the chip reset config */
 169         gpio_resetcfg = nlm_read_reg(gpio_mmio, GPIO_PWRON_RESET_CFG_REG);
 170
 171         /* Check for boot flash type */
 172         boot_nor = boot_nand = 0;
 173         if (nlm_chip_is_xls()) {
 174                 /* On XLS, check boot from NAND bit (GPIO reset reg bit 16) */
 175                 if (gpio_resetcfg & (1 << 16))
 176                         boot_nand = 1;
 177
 178                 /* check boot from PCMCIA, (GPIO reset reg bit 15 */
 179                 if ((gpio_resetcfg & (1 << 15)) == 0)
 180                         boot_nor = 1;   /* not set, booted from NOR */
 181         } else { /* XLR */
 182                 /* check boot from PCMCIA (bit 16 in GPIO reset on XLR) */
 183                 if ((gpio_resetcfg & (1 << 16)) == 0)
 184                         boot_nor = 1;   /* not set, booted from NOR */
 185         }
 186
 187         /* boot flash at chip select 0 */
 188         cs = 0;
 189
 190         if (boot_nand) {
 191                 nand_priv.cs = cs;
 192                 nand_priv.flash_mmio = flash_mmio;
 193                 setup_flash_resource(flash_mmio, flash_map_base, cs,
 194                          xlr_nand_res);
 195
 196                 /* Initialize NAND flash at CS 0 */
 197                 nlm_write_reg(flash_mmio, FLASH_CSDEV_PARM(cs),
 198                                 FLASH_NAND_CSDEV_PARAM);
 199                 nlm_write_reg(flash_mmio, FLASH_CSTIME_PARMA(cs),
 200                                 FLASH_NAND_CSTIME_PARAMA);
 201                 nlm_write_reg(flash_mmio, FLASH_CSTIME_PARMB(cs),
 202                                 FLASH_NAND_CSTIME_PARAMB);
 203
 204                 pr_info("ChipSelect %d: NAND Flash %pR\n", cs, xlr_nand_res);
 205                 return platform_device_register(&xlr_nand_dev);
 206         }
 207
 208         if (boot_nor) {
 209                 setup_flash_resource(flash_mmio, flash_map_base, cs,
 210                         xlr_nor_res);
 211                 pr_info("ChipSelect %d: NOR Flash %pR\n", cs, xlr_nor_res);
 212                 return platform_device_register(&xlr_nor_dev);
 213         }
 214         return 0;
 215 }
 216
 217 arch_initcall(xlr_flash_init);