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Linux/arch/mips/bcm63xx/dev-flash.c

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  1 /*
  2  * Broadcom BCM63xx flash registration
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file "COPYING" in the main directory of this archive
  6  * for more details.
  7  *
  8  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
  9  * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
 10  * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
 11  */
 12 
 13 #include <linux/init.h>
 14 #include <linux/kernel.h>
 15 #include <linux/platform_device.h>
 16 #include <linux/mtd/mtd.h>
 17 #include <linux/mtd/partitions.h>
 18 #include <linux/mtd/physmap.h>
 19 
 20 #include <bcm63xx_cpu.h>
 21 #include <bcm63xx_dev_flash.h>
 22 #include <bcm63xx_regs.h>
 23 #include <bcm63xx_io.h>
 24 
 25 static struct mtd_partition mtd_partitions[] = {
 26         {
 27                 .name           = "cfe",
 28                 .offset         = 0x0,
 29                 .size           = 0x40000,
 30         }
 31 };
 32 
 33 static const char *bcm63xx_part_types[] = { "bcm63xxpart", NULL };
 34 
 35 static struct physmap_flash_data flash_data = {
 36         .width                  = 2,
 37         .parts                  = mtd_partitions,
 38         .part_probe_types       = bcm63xx_part_types,
 39 };
 40 
 41 static struct resource mtd_resources[] = {
 42         {
 43                 .start          = 0,    /* filled at runtime */
 44                 .end            = 0,    /* filled at runtime */
 45                 .flags          = IORESOURCE_MEM,
 46         }
 47 };
 48 
 49 static struct platform_device mtd_dev = {
 50         .name                   = "physmap-flash",
 51         .resource               = mtd_resources,
 52         .num_resources          = ARRAY_SIZE(mtd_resources),
 53         .dev                    = {
 54                 .platform_data  = &flash_data,
 55         },
 56 };
 57 
 58 static int __init bcm63xx_detect_flash_type(void)
 59 {
 60         u32 val;
 61 
 62         switch (bcm63xx_get_cpu_id()) {
 63         case BCM6328_CPU_ID:
 64                 val = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
 65                 if (val & STRAPBUS_6328_BOOT_SEL_SERIAL)
 66                         return BCM63XX_FLASH_TYPE_SERIAL;
 67                 else
 68                         return BCM63XX_FLASH_TYPE_NAND;
 69         case BCM6338_CPU_ID:
 70         case BCM6345_CPU_ID:
 71         case BCM6348_CPU_ID:
 72                 /* no way to auto detect so assume parallel */
 73                 return BCM63XX_FLASH_TYPE_PARALLEL;
 74         case BCM3368_CPU_ID:
 75         case BCM6358_CPU_ID:
 76                 val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
 77                 if (val & STRAPBUS_6358_BOOT_SEL_PARALLEL)
 78                         return BCM63XX_FLASH_TYPE_PARALLEL;
 79                 else
 80                         return BCM63XX_FLASH_TYPE_SERIAL;
 81         case BCM6362_CPU_ID:
 82                 val = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
 83                 if (val & STRAPBUS_6362_BOOT_SEL_SERIAL)
 84                         return BCM63XX_FLASH_TYPE_SERIAL;
 85                 else
 86                         return BCM63XX_FLASH_TYPE_NAND;
 87         case BCM6368_CPU_ID:
 88                 val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
 89                 switch (val & STRAPBUS_6368_BOOT_SEL_MASK) {
 90                 case STRAPBUS_6368_BOOT_SEL_NAND:
 91                         return BCM63XX_FLASH_TYPE_NAND;
 92                 case STRAPBUS_6368_BOOT_SEL_SERIAL:
 93                         return BCM63XX_FLASH_TYPE_SERIAL;
 94                 case STRAPBUS_6368_BOOT_SEL_PARALLEL:
 95                         return BCM63XX_FLASH_TYPE_PARALLEL;
 96                 }
 97         default:
 98                 return -EINVAL;
 99         }
100 }
101 
102 int __init bcm63xx_flash_register(void)
103 {
104         int flash_type;
105         u32 val;
106 
107         flash_type = bcm63xx_detect_flash_type();
108 
109         switch (flash_type) {
110         case BCM63XX_FLASH_TYPE_PARALLEL:
111                 /* read base address of boot chip select (0) */
112                 val = bcm_mpi_readl(MPI_CSBASE_REG(0));
113                 val &= MPI_CSBASE_BASE_MASK;
114 
115                 mtd_resources[0].start = val;
116                 mtd_resources[0].end = 0x1FFFFFFF;
117 
118                 return platform_device_register(&mtd_dev);
119         case BCM63XX_FLASH_TYPE_SERIAL:
120                 pr_warn("unsupported serial flash detected\n");
121                 return -ENODEV;
122         case BCM63XX_FLASH_TYPE_NAND:
123                 pr_warn("unsupported NAND flash detected\n");
124                 return -ENODEV;
125         default:
126                 pr_err("flash detection failed for BCM%x: %d\n",
127                        bcm63xx_get_cpu_id(), flash_type);
128                 return -ENODEV;
129         }
130 }
131 

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