// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/unicore32/kernel/puv3-core.c
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
 *      Copyright (C) 2001-2010 Guan Xuetao
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/cnt32_to_63.h>
#include <linux/usb/musb.h>

#include <asm/irq.h>
#include <mach/hardware.h>
#include <mach/pm.h>

/*
 * This is the PKUnity sched_clock implementation.  This has
 * a resolution of 271ns, and a maximum value of 32025597s (370 days).
 *
 * The return value is guaranteed to be monotonic in that range as
 * long as there is always less than 582 seconds between successive
 * calls to this function.
 *
 *  ( * 1E9 / CLOCK_TICK_RATE ) -> about 2235/32
 */
unsigned long long sched_clock(void)
{
        unsigned long long v = cnt32_to_63(readl(OST_OSCR));

        /* original conservative method, but overflow frequently
         * v *= NSEC_PER_SEC >> 12;
         * do_div(v, CLOCK_TICK_RATE >> 12);
         */
        v = ((v & 0x7fffffffffffffffULL) * 2235) >> 5;

        return v;
}

static struct resource puv3_usb_resources[] = {
        /* order is significant! */
        {
                .start          = io_v2p(PKUNITY_USB_BASE),
                .end            = io_v2p(PKUNITY_USB_BASE) + 0x3ff,
                .flags          = IORESOURCE_MEM,
        }, {
                .start          = IRQ_USB,
                .flags          = IORESOURCE_IRQ,
        }, {
                .start          = IRQ_USB,
                .flags          = IORESOURCE_IRQ,
        },
};

static struct musb_hdrc_config  puv3_usb_config[] = {
        {
                .num_eps = 16,
                .multipoint = 1,
#ifdef CONFIG_USB_INVENTRA_DMA
                .dma = 1,
                .dma_channels = 8,
#endif
        },
};

static struct musb_hdrc_platform_data puv3_usb_plat = {
        .mode           = MUSB_HOST,
        .min_power      = 100,
        .clock          = 0,
        .config         = puv3_usb_config,
};

static struct resource puv3_mmc_resources[] = {
        [0] = {
                .start  = io_v2p(PKUNITY_SDC_BASE),
                .end    = io_v2p(PKUNITY_SDC_BASE) + 0xfff,
                .flags  = IORESOURCE_MEM,
        },
        [1] = {
                .start  = IRQ_SDC,
                .end    = IRQ_SDC,
                .flags  = IORESOURCE_IRQ,
        },
};

static struct resource puv3_unigfx_resources[] = {
        [0] = {
                .start  = io_v2p(PKUNITY_UNIGFX_BASE),
                .end    = io_v2p(PKUNITY_UNIGFX_BASE) + 0xfff,
                .flags  = IORESOURCE_MEM,
        },
};

static struct resource puv3_rtc_resources[] = {
        [0] = {
                .start = io_v2p(PKUNITY_RTC_BASE),
                .end   = io_v2p(PKUNITY_RTC_BASE) + 0xff,
                .flags = IORESOURCE_MEM,
        },
        [1] = {
                .start = IRQ_RTCAlarm,
                .end   = IRQ_RTCAlarm,
                .flags = IORESOURCE_IRQ,
        },
        [2] = {
                .start = IRQ_RTC,
                .end   = IRQ_RTC,
                .flags = IORESOURCE_IRQ
        }
};

static struct resource puv3_pwm_resources[] = {
        [0] = {
                .start  = io_v2p(PKUNITY_OST_BASE) + 0x80,
                .end    = io_v2p(PKUNITY_OST_BASE) + 0xff,
                .flags  = IORESOURCE_MEM,
        },
};

static struct resource puv3_uart0_resources[] = {
        [0] = {
                .start = io_v2p(PKUNITY_UART0_BASE),
                .end   = io_v2p(PKUNITY_UART0_BASE) + 0xff,
                .flags = IORESOURCE_MEM,
        },
        [1] = {
                .start = IRQ_UART0,
                .end   = IRQ_UART0,
                .flags = IORESOURCE_IRQ
        }
};

static struct resource puv3_uart1_resources[] = {
        [0] = {
                .start = io_v2p(PKUNITY_UART1_BASE),
                .end   = io_v2p(PKUNITY_UART1_BASE) + 0xff,
                .flags = IORESOURCE_MEM,
        },
        [1] = {
                .start = IRQ_UART1,
                .end   = IRQ_UART1,
                .flags = IORESOURCE_IRQ
        }
};

static struct resource puv3_umal_resources[] = {
        [0] = {
                .start = io_v2p(PKUNITY_UMAL_BASE),
                .end   = io_v2p(PKUNITY_UMAL_BASE) + 0x1fff,
                .flags = IORESOURCE_MEM,
        },
        [1] = {
                .start = IRQ_UMAL,
                .end   = IRQ_UMAL,
                .flags = IORESOURCE_IRQ
        }
};

#ifdef CONFIG_PUV3_PM

#define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global PXA peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * with the stack pointer in sleep.S.
 */
enum {
        SLEEP_SAVE_PM_PLLDDRCFG,
        SLEEP_SAVE_COUNT
};


static void puv3_cpu_pm_save(unsigned long *sleep_save)
{
/*      SAVE(PM_PLLDDRCFG); */
}

static void puv3_cpu_pm_restore(unsigned long *sleep_save)
{
/*      RESTORE(PM_PLLDDRCFG); */
}

static int puv3_cpu_pm_prepare(void)
{
        /* set resume return address */
        writel(virt_to_phys(puv3_cpu_resume), PM_DIVCFG);
        return 0;
}

static void puv3_cpu_pm_enter(suspend_state_t state)
{
        /* Clear reset status */
        writel(RESETC_RSSR_HWR | RESETC_RSSR_WDR
                        | RESETC_RSSR_SMR | RESETC_RSSR_SWR, RESETC_RSSR);

        switch (state) {
/*      case PM_SUSPEND_ON:
                puv3_cpu_idle();
                break; */
        case PM_SUSPEND_MEM:
                puv3_cpu_pm_prepare();
                puv3_cpu_suspend(PM_PMCR_SFB);
                break;
        }
}

static int puv3_cpu_pm_valid(suspend_state_t state)
{
        return state == PM_SUSPEND_MEM;
}

static void puv3_cpu_pm_finish(void)
{
        /* ensure not to come back here if it wasn't intended */
        /* PSPR = 0; */
}

static struct puv3_cpu_pm_fns puv3_cpu_pm_fnss = {
        .save_count     = SLEEP_SAVE_COUNT,
        .valid          = puv3_cpu_pm_valid,
        .save           = puv3_cpu_pm_save,
        .restore        = puv3_cpu_pm_restore,
        .enter          = puv3_cpu_pm_enter,
        .prepare        = puv3_cpu_pm_prepare,
        .finish         = puv3_cpu_pm_finish,
};

static void __init puv3_init_pm(void)
{
        puv3_cpu_pm_fns = &puv3_cpu_pm_fnss;
}
#else
static inline void puv3_init_pm(void) {}
#endif

void puv3_ps2_init(void)
{
        struct clk *bclk32;

        bclk32 = clk_get(NULL, "BUS32_CLK");
        writel(clk_get_rate(bclk32) / 200000, PS2_CNT); /* should > 5us */
}

void __init puv3_core_init(void)
{
        puv3_init_pm();
        puv3_ps2_init();

        platform_device_register_simple("PKUnity-v3-RTC", -1,
                        puv3_rtc_resources, ARRAY_SIZE(puv3_rtc_resources));
        platform_device_register_simple("PKUnity-v3-UMAL", -1,
                        puv3_umal_resources, ARRAY_SIZE(puv3_umal_resources));
        platform_device_register_simple("PKUnity-v3-MMC", -1,
                        puv3_mmc_resources, ARRAY_SIZE(puv3_mmc_resources));
        platform_device_register_simple("PKUnity-v3-UNIGFX", -1,
                        puv3_unigfx_resources, ARRAY_SIZE(puv3_unigfx_resources));
        platform_device_register_simple("PKUnity-v3-PWM", -1,
                        puv3_pwm_resources, ARRAY_SIZE(puv3_pwm_resources));
        platform_device_register_simple("PKUnity-v3-UART", 0,
                        puv3_uart0_resources, ARRAY_SIZE(puv3_uart0_resources));
        platform_device_register_simple("PKUnity-v3-UART", 1,
                        puv3_uart1_resources, ARRAY_SIZE(puv3_uart1_resources));
        platform_device_register_simple("PKUnity-v3-AC97", -1, NULL, 0);
        platform_device_register_resndata(NULL, "musb_hdrc", -1,
                        puv3_usb_resources, ARRAY_SIZE(puv3_usb_resources),
                        &puv3_usb_plat, sizeof(puv3_usb_plat));
}