FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91sam9260.c

     /*-
      * Copyright (c) 2005 Olivier Houchard.  All rights reserved.
      * Copyright (c) 2010 Greg Ansley.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.0/sys/arm/at91/at91sam9260.c 213498 2010-10-06 22:40:27Z cognet $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    
    #define _ARM32_BUS_DMA_PRIVATE
    #include <machine/bus.h>
    
    #include <arm/at91/at91var.h>
    #include <arm/at91/at91_aicreg.h>
    #include <arm/at91/at91sam9260reg.h>
    #include <arm/at91/at91_pmcreg.h>
    #include <arm/at91/at91_pmcvar.h>
    
    struct at91sam9_softc {
            device_t dev;
            bus_space_tag_t sc_st;
            bus_space_handle_t sc_sh;
            bus_space_handle_t sc_sys_sh;
            bus_space_handle_t sc_aic_sh;
            bus_space_handle_t sc_dbg_sh;
            bus_space_handle_t sc_matrix_sh;
    };
    
    /*
     * Standard priority levels for the system.  0 is lowest and 7 is highest.
     * These values are the ones Atmel uses for its Linux port
     */
    static const int at91_irq_prio[32] =
    {
            7,      /* Advanced Interrupt Controller */
            7,      /* System Peripherals */
            1,      /* Parallel IO Controller A */
            1,      /* Parallel IO Controller B */
            1,      /* Parallel IO Controller C */
            0,      /* Analog-to-Digital Converter */
            5,      /* USART 0 */
            5,      /* USART 1 */
            5,      /* USART 2 */
            0,      /* Multimedia Card Interface */
            2,      /* USB Device Port */
            6,      /* Two-Wire Interface */
            5,      /* Serial Peripheral Interface 0 */
            5,      /* Serial Peripheral Interface 1 */
            5,      /* Serial Synchronous Controller */
            0,      /* (reserved) */
            0,      /* (reserved) */
            0,      /* Timer Counter 0 */
            0,      /* Timer Counter 1 */
            0,      /* Timer Counter 2 */
            2,      /* USB Host port */
            3,      /* Ethernet */
            0,      /* Image Sensor Interface */
            5,      /* USART 3 */
            5,      /* USART 4 */
            5,      /* USART 5 */
            0,      /* Timer Counter 3 */
            0,      /* Timer Counter 4 */
            0,      /* Timer Counter 5 */
            0,      /* Advanced Interrupt Controller IRQ0 */
            0,      /* Advanced Interrupt Controller IRQ1 */
            0,      /* Advanced Interrupt Controller IRQ2 */
    };
    
    #define DEVICE(_name, _id, _unit)               \
            {                                       \
                    _name, _unit,                   \
                    AT91SAM9260_ ## _id ##_BASE,    \
                   AT91SAM9260_ ## _id ## _SIZE,   \
                   AT91SAM9260_IRQ_ ## _id         \
           }
   
   static const struct cpu_devs at91_devs[] =
   {
           DEVICE("at91_pmc", PMC,  0),
           DEVICE("at91_wdt", WDT,  0),
           DEVICE("at91_rst", RSTC, 0),
           DEVICE("at91_pit", PIT,  0),
           DEVICE("at91_pio", PIOA, 0),
           DEVICE("at91_pio", PIOB, 1),
           DEVICE("at91_pio", PIOC, 2),
           DEVICE("at91_twi", TWI, 0),
           DEVICE("at91_mci", MCI, 0),
           DEVICE("uart", DBGU,   0),
           DEVICE("uart", USART0, 1),
           DEVICE("uart", USART1, 2),
           DEVICE("uart", USART2, 3),
           DEVICE("uart", USART3, 4),
           DEVICE("uart", USART4, 5),
           DEVICE("uart", USART5, 6),
           DEVICE("spi",  SPI0,   0),
           DEVICE("spi",  SPI1,   1),
           DEVICE("ate",  EMAC,   0),
           DEVICE("macb", EMAC,   0),
           DEVICE("nand", NAND,   0),
           DEVICE("ohci", OHCI,   0),
           { 0, 0, 0, 0, 0 }
   };
   
   static void
   at91_add_child(device_t dev, int prio, const char *name, int unit,
       bus_addr_t addr, bus_size_t size, int irq0, int irq1, int irq2)
   {
           device_t kid;
           struct at91_ivar *ivar;
   
           kid = device_add_child_ordered(dev, prio, name, unit);
           if (kid == NULL) {
               printf("Can't add child %s%d ordered\n", name, unit);
               return;
           }
           ivar = malloc(sizeof(*ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
           if (ivar == NULL) {
                   device_delete_child(dev, kid);
                   printf("Can't add alloc ivar\n");
                   return;
           }
           device_set_ivars(kid, ivar);
           resource_list_init(&ivar->resources);
           if (irq0 != -1) {
                   bus_set_resource(kid, SYS_RES_IRQ, 0, irq0, 1);
                   if (irq0 != AT91SAM9260_IRQ_SYSTEM)
                           at91_pmc_clock_add(device_get_nameunit(kid), irq0, 0);
           }
           if (irq1 != 0)
                   bus_set_resource(kid, SYS_RES_IRQ, 1, irq1, 1);
           if (irq2 != 0)
                   bus_set_resource(kid, SYS_RES_IRQ, 2, irq2, 1);
           if (addr != 0 && addr < AT91SAM9260_BASE) 
                   addr += AT91SAM9260_BASE;
           if (addr != 0)
                   bus_set_resource(kid, SYS_RES_MEMORY, 0, addr, size);
   }
   
   static void
   at91_cpu_add_builtin_children(device_t dev)
   {
           int i;
           const struct cpu_devs *walker;
   
           for (i = 1, walker = at91_devs; walker->name; i++, walker++) {
                   at91_add_child(dev, i, walker->name, walker->unit,
                       walker->mem_base, walker->mem_len, walker->irq0,
                       walker->irq1, walker->irq2);
           }
   }
   
   static uint32_t
   at91_pll_outa(int freq)
   {
   
           if (freq > 195000000)
                   return (0x20000000);
           else 
                   return (0x20008000);
   }
   
   static uint32_t
   at91_pll_outb(int freq)
   {
           return (0x4000);
   }
   
   static void
   at91_identify(driver_t *drv, device_t parent)
   {
   
           if (at91_cpu_is(AT91_CPU_SAM9260)) {
                   at91_add_child(parent, 0, "at91sam9260", 0, 0, 0, -1, 0, 0);
                   at91_cpu_add_builtin_children(parent);
           }
   }
   
   static int
   at91_probe(device_t dev)
   {
   
           if (at91_cpu_is(AT91_CPU_SAM9260)) {
                   device_set_desc(dev, "AT91SAM9260");
                   return (0);
           }
           return (ENXIO);
   }
   
   static int
   at91_attach(device_t dev)
   {
           struct at91_pmc_clock *clk;
           struct at91sam9_softc *sc = device_get_softc(dev);
           int i;
   
           struct at91_softc *at91sc = device_get_softc(device_get_parent(dev));
   
           sc->sc_st = at91sc->sc_st;
           sc->sc_sh = at91sc->sc_sh;
           sc->dev = dev;
   
           /* 
            * XXX These values work for the RM9200, SAM926[01], and SAM9260
            * will have to fix this when we want to support anything else. XXX
            */
           if (bus_space_subregion(sc->sc_st, sc->sc_sh, AT91SAM9260_SYS_BASE,
               AT91SAM9260_SYS_SIZE, &sc->sc_sys_sh) != 0)
                   panic("Enable to map system registers");
   
           if (bus_space_subregion(sc->sc_st, sc->sc_sh, AT91SAM9260_DBGU_BASE,
               AT91SAM9260_DBGU_SIZE, &sc->sc_dbg_sh) != 0)
                   panic("Enable to map DBGU registers");
   
           if (bus_space_subregion(sc->sc_st, sc->sc_sh, AT91SAM9260_AIC_BASE,
               AT91SAM9260_AIC_SIZE, &sc->sc_aic_sh) != 0)
                   panic("Enable to map system registers");
   
           /* XXX Hack to tell atmelarm about the AIC */
           at91sc->sc_aic_sh = sc->sc_aic_sh;
           at91sc->sc_irq_system = AT91SAM9260_IRQ_SYSTEM;
   
           for (i = 0; i < 32; i++) {
                   bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_SVR + 
                       i * 4, i);
                   /* Priority. */
                   bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_SMR + i * 4,
                       at91_irq_prio[i]);
                   if (i < 8)
                           bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_EOICR,
                               1);
           }
   
           bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_SPU, 32);
           /* No debug. */
           bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_DCR, 0);
           /* Disable and clear all interrupts. */
           bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_IDCR, 0xffffffff);
           bus_space_write_4(sc->sc_st, sc->sc_aic_sh, IC_ICCR, 0xffffffff);
   
           /* Disable all interrupts for DBGU */
           bus_space_write_4(sc->sc_st, sc->sc_dbg_sh, 0x0c, 0xffffffff);
   
           if (bus_space_subregion(sc->sc_st, sc->sc_sh,
               AT91SAM9260_MATRIX_BASE, AT91SAM9260_MATRIX_SIZE,
               &sc->sc_matrix_sh) != 0)
                   panic("Enable to map matrix registers");
   
           /* activate NAND*/
           i = bus_space_read_4(sc->sc_st, sc->sc_matrix_sh,
               AT91SAM9260_EBICSA);
           bus_space_write_4(sc->sc_st, sc->sc_matrix_sh,
               AT91SAM9260_EBICSA, 
               i | AT91_MATRIX_EBI_CS3A_SMC_SMARTMEDIA);
   
   
           /* Update USB device port clock info */
           clk = at91_pmc_clock_ref("udpck");
           clk->pmc_mask  = PMC_SCER_UDP_SAM9;
           at91_pmc_clock_deref(clk);
   
           /* Update USB host port clock info */
           clk = at91_pmc_clock_ref("uhpck");
           clk->pmc_mask  = PMC_SCER_UHP_SAM9;
           at91_pmc_clock_deref(clk);
   
           /* Each SOC has different PLL contraints */
           clk = at91_pmc_clock_ref("plla");
           clk->pll_min_in    = SAM9260_PLL_A_MIN_IN_FREQ;         /*   1 MHz */
           clk->pll_max_in    = SAM9260_PLL_A_MAX_IN_FREQ;         /*  32 MHz */
           clk->pll_min_out   = SAM9260_PLL_A_MIN_OUT_FREQ;        /*  80 MHz */
           clk->pll_max_out   = SAM9260_PLL_A_MAX_OUT_FREQ;        /* 240 MHz */
           clk->pll_mul_shift = SAM9260_PLL_A_MUL_SHIFT;
           clk->pll_mul_mask  = SAM9260_PLL_A_MUL_MASK;
           clk->pll_div_shift = SAM9260_PLL_A_DIV_SHIFT;
           clk->pll_div_mask  = SAM9260_PLL_A_DIV_MASK;
           clk->set_outb      = at91_pll_outa;
           at91_pmc_clock_deref(clk);
   
           /*
            * Fudge MAX pll in frequence down below 3.0 Mhz to ensure 
            * PMC alogrithm choose the divisor that causes the input clock 
            * to be near the optimal 2 Mhz per datasheet. We know
            * we are going to be using this for the USB clock at 96 Mhz.
            * Causes no extra frequency deviation for all recomended crystal values.
            */
           clk = at91_pmc_clock_ref("pllb");
           clk->pll_min_in    = SAM9260_PLL_B_MIN_IN_FREQ;         /*   1 MHz */
           clk->pll_max_in    = SAM9260_PLL_B_MAX_IN_FREQ;         /*   5 MHz */
           clk->pll_max_in    = 2999999;                           /*  ~3 MHz */
           clk->pll_min_out   = SAM9260_PLL_B_MIN_OUT_FREQ;        /*  70 MHz */
           clk->pll_max_out   = SAM9260_PLL_B_MAX_OUT_FREQ;        /* 130 MHz */
           clk->pll_mul_shift = SAM9260_PLL_B_MUL_SHIFT;
           clk->pll_mul_mask  = SAM9260_PLL_B_MUL_MASK;
           clk->pll_div_shift = SAM9260_PLL_B_DIV_SHIFT;
           clk->pll_div_mask  = SAM9260_PLL_B_DIV_MASK;
           clk->set_outb      = at91_pll_outb;
           at91_pmc_clock_deref(clk);
           return (0);
   }
   
   static device_method_t at91sam9260_methods[] = {
           DEVMETHOD(device_probe, at91_probe),
           DEVMETHOD(device_attach, at91_attach),
           DEVMETHOD(device_identify, at91_identify),
           {0, 0},
   };
   
   static driver_t at91sam9260_driver = {
           "at91sam9260",
           at91sam9260_methods,
           sizeof(struct at91sam9_softc),
   };
   
   static devclass_t at91sam9260_devclass;
   
   DRIVER_MODULE(at91sam9260, atmelarm, at91sam9260_driver, at91sam9260_devclass, 0, 0);

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