/* linux/arch/arm/plat-s3c24xx/s3c2443-clock.c * * Copyright (c) 2007, 2010 Simtec Electronics * Ben Dooks * * S3C2443 Clock control suport - common code */ #include #include #include #include #include #include #include #include #include static int s3c2443_gate(void __iomem *reg, struct clk *clk, int enable) { u32 ctrlbit = clk->ctrlbit; u32 con = __raw_readl(reg); if (enable) con |= ctrlbit; else con &= ~ctrlbit; __raw_writel(con, reg); return 0; } int s3c2443_clkcon_enable_h(struct clk *clk, int enable) { return s3c2443_gate(S3C2443_HCLKCON, clk, enable); } int s3c2443_clkcon_enable_p(struct clk *clk, int enable) { return s3c2443_gate(S3C2443_PCLKCON, clk, enable); } int s3c2443_clkcon_enable_s(struct clk *clk, int enable) { return s3c2443_gate(S3C2443_SCLKCON, clk, enable); } /* mpllref is a direct descendant of clk_xtal by default, but it is not * elided as the EPLL can be either sourced by the XTAL or EXTCLK and as * such directly equating the two source clocks is impossible. */ struct clk clk_mpllref = { .name = "mpllref", .parent = &clk_xtal, }; static struct clk *clk_epllref_sources[] = { [0] = &clk_mpllref, [1] = &clk_mpllref, [2] = &clk_xtal, [3] = &clk_ext, }; struct clksrc_clk clk_epllref = { .clk = { .name = "epllref", }, .sources = &(struct clksrc_sources) { .sources = clk_epllref_sources, .nr_sources = ARRAY_SIZE(clk_epllref_sources), }, .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 7 }, }; /* esysclk * * this is sourced from either the EPLL or the EPLLref clock */ static struct clk *clk_sysclk_sources[] = { [0] = &clk_epllref.clk, [1] = &clk_epll, }; struct clksrc_clk clk_esysclk = { .clk = { .name = "esysclk", .parent = &clk_epll, }, .sources = &(struct clksrc_sources) { .sources = clk_sysclk_sources, .nr_sources = ARRAY_SIZE(clk_sysclk_sources), }, .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 6 }, }; static unsigned long s3c2443_getrate_mdivclk(struct clk *clk) { unsigned long parent_rate = clk_get_rate(clk->parent); unsigned long div = __raw_readl(S3C2443_CLKDIV0); div &= S3C2443_CLKDIV0_EXTDIV_MASK; div >>= (S3C2443_CLKDIV0_EXTDIV_SHIFT-1); /* x2 */ return parent_rate / (div + 1); } static struct clk clk_mdivclk = { .name = "mdivclk", .parent = &clk_mpllref, .ops = &(struct clk_ops) { .get_rate = s3c2443_getrate_mdivclk, }, }; static struct clk *clk_msysclk_sources[] = { [0] = &clk_mpllref, [1] = &clk_mpll, [2] = &clk_mdivclk, [3] = &clk_mpllref, }; struct clksrc_clk clk_msysclk = { .clk = { .name = "msysclk", .parent = &clk_xtal, }, .sources = &(struct clksrc_sources) { .sources = clk_msysclk_sources, .nr_sources = ARRAY_SIZE(clk_msysclk_sources), }, .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 3 }, }; /* prediv * * this divides the msysclk down to pass to h/p/etc. */ static unsigned long s3c2443_prediv_getrate(struct clk *clk) { unsigned long rate = clk_get_rate(clk->parent); unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0); clkdiv0 &= S3C2443_CLKDIV0_PREDIV_MASK; clkdiv0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT; return rate / (clkdiv0 + 1); } static struct clk clk_prediv = { .name = "prediv", .parent = &clk_msysclk.clk, .ops = &(struct clk_ops) { .get_rate = s3c2443_prediv_getrate, }, }; /* armdiv * * this clock is sourced from msysclk and can have a number of * divider values applied to it to then be fed into armclk. */ static unsigned int *armdiv; static int nr_armdiv; static int armdivmask; static unsigned long s3c2443_armclk_roundrate(struct clk *clk, unsigned long rate) { unsigned long parent = clk_get_rate(clk->parent); unsigned long calc; unsigned best = 256; /* bigger than any value */ unsigned div; int ptr; if (!nr_armdiv) return -EINVAL; for (ptr = 0; ptr < nr_armdiv; ptr++) { div = armdiv[ptr]; if (div) { /* cpufreq provides 266mhz as 266666000 not 266666666 */ calc = (parent / div / 1000) * 1000; if (calc <= rate && div < best) best = div; } } return parent / best; } static unsigned long s3c2443_armclk_getrate(struct clk *clk) { unsigned long rate = clk_get_rate(clk->parent); unsigned long clkcon0; int val; if (!nr_armdiv || !armdivmask) return -EINVAL; clkcon0 = __raw_readl(S3C2443_CLKDIV0); clkcon0 &= armdivmask; val = clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT; return rate / armdiv[val]; } static int s3c2443_armclk_setrate(struct clk *clk, unsigned long rate) { unsigned long parent = clk_get_rate(clk->parent); unsigned long calc; unsigned div; unsigned best = 256; /* bigger than any value */ int ptr; int val = -1; if (!nr_armdiv || !armdivmask) return -EINVAL; for (ptr = 0; ptr < nr_armdiv; ptr++) { div = armdiv[ptr]; if (div) { /* cpufreq provides 266mhz as 266666000 not 266666666 */ calc = (parent / div / 1000) * 1000; if (calc <= rate && div < best) { best = div; val = ptr; } } } if (val >= 0) { unsigned long clkcon0; clkcon0 = __raw_readl(S3C2443_CLKDIV0); clkcon0 &= ~armdivmask; clkcon0 |= val << S3C2443_CLKDIV0_ARMDIV_SHIFT; __raw_writel(clkcon0, S3C2443_CLKDIV0); } return (val == -1) ? -EINVAL : 0; } static struct clk clk_armdiv = { .name = "armdiv", .parent = &clk_msysclk.clk, .ops = &(struct clk_ops) { .round_rate = s3c2443_armclk_roundrate, .get_rate = s3c2443_armclk_getrate, .set_rate = s3c2443_armclk_setrate, }, }; /* armclk * * this is the clock fed into the ARM core itself, from armdiv or from hclk. */ static struct clk *clk_arm_sources[] = { [0] = &clk_armdiv, [1] = &clk_h, }; static struct clksrc_clk clk_arm = { .clk = { .name = "armclk", }, .sources = &(struct clksrc_sources) { .sources = clk_arm_sources, .nr_sources = ARRAY_SIZE(clk_arm_sources), }, .reg_src = { .reg = S3C2443_CLKDIV0, .size = 1, .shift = 13 }, }; /* usbhost * * usb host bus-clock, usually 48MHz to provide USB bus clock timing */ static struct clksrc_clk clk_usb_bus_host = { .clk = { .name = "usb-bus-host-parent", .parent = &clk_esysclk.clk, .ctrlbit = S3C2443_SCLKCON_USBHOST, .enable = s3c2443_clkcon_enable_s, }, .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 }, }; /* common clksrc clocks */ static struct clksrc_clk clksrc_clks[] = { { /* ART baud-rate clock sourced from esysclk via a divisor */ .clk = { .name = "uartclk", .parent = &clk_esysclk.clk, }, .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 8 }, }, { /* camera interface bus-clock, divided down from esysclk */ .clk = { .name = "camif-upll", /* same as 2440 name */ .parent = &clk_esysclk.clk, .ctrlbit = S3C2443_SCLKCON_CAMCLK, .enable = s3c2443_clkcon_enable_s, }, .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 26 }, }, { .clk = { .name = "display-if", .parent = &clk_esysclk.clk, .ctrlbit = S3C2443_SCLKCON_DISPCLK, .enable = s3c2443_clkcon_enable_s, }, .reg_div = { .reg = S3C2443_CLKDIV1, .size = 8, .shift = 16 }, }, }; static struct clk clk_i2s_ext = { .name = "i2s-ext", }; /* i2s_eplldiv * * This clock is the output from the I2S divisor of ESYSCLK, and is separate * from the mux that comes after it (cannot merge into one single clock) */ static struct clksrc_clk clk_i2s_eplldiv = { .clk = { .name = "i2s-eplldiv", .parent = &clk_esysclk.clk, }, .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, }, }; /* i2s-ref * * i2s bus reference clock, selectable from external, esysclk or epllref * * Note, this used to be two clocks, but was compressed into one. */ static struct clk *clk_i2s_srclist[] = { [0] = &clk_i2s_eplldiv.clk, [1] = &clk_i2s_ext, [2] = &clk_epllref.clk, [3] = &clk_epllref.clk, }; static struct clksrc_clk clk_i2s = { .clk = { .name = "i2s-if", .ctrlbit = S3C2443_SCLKCON_I2SCLK, .enable = s3c2443_clkcon_enable_s, }, .sources = &(struct clksrc_sources) { .sources = clk_i2s_srclist, .nr_sources = ARRAY_SIZE(clk_i2s_srclist), }, .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 }, }; static struct clk init_clocks_off[] = { { .name = "iis", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_IIS, }, { .name = "hsspi", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_HSSPI, }, { .name = "adc", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_ADC, }, { .name = "i2c", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_IIC, } }; static struct clk init_clocks[] = { { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA0, }, { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA1, }, { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA2, }, { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA3, }, { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA4, }, { .name = "dma", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_DMA5, }, { .name = "hsmmc", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_HSMMC, }, { .name = "gpio", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_GPIO, }, { .name = "usb-host", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_USBH, }, { .name = "usb-device", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_USBD, }, { .name = "lcd", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_LCDC, }, { .name = "timers", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_PWMT, }, { .name = "cfc", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_CFC, }, { .name = "ssmc", .parent = &clk_h, .enable = s3c2443_clkcon_enable_h, .ctrlbit = S3C2443_HCLKCON_SSMC, }, { .name = "uart", .devname = "s3c2440-uart.0", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_UART0, }, { .name = "uart", .devname = "s3c2440-uart.1", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_UART1, }, { .name = "uart", .devname = "s3c2440-uart.2", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_UART2, }, { .name = "uart", .devname = "s3c2440-uart.3", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_UART3, }, { .name = "rtc", .parent = &clk_p, .enable = s3c2443_clkcon_enable_p, .ctrlbit = S3C2443_PCLKCON_RTC, }, { .name = "watchdog", .parent = &clk_p, .ctrlbit = S3C2443_PCLKCON_WDT, }, { .name = "ac97", .parent = &clk_p, .ctrlbit = S3C2443_PCLKCON_AC97, }, { .name = "nand", .parent = &clk_h, }, { .name = "usb-bus-host", .parent = &clk_usb_bus_host.clk, } }; static inline unsigned long s3c2443_get_hdiv(unsigned long clkcon0) { clkcon0 &= S3C2443_CLKDIV0_HCLKDIV_MASK; return clkcon0 + 1; } /* EPLLCON compatible enough to get on/off information */ void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll, fdiv_fn get_fdiv) { unsigned long epllcon = __raw_readl(S3C2443_EPLLCON); unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON); unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0); struct clk *xtal_clk; unsigned long xtal; unsigned long pll; unsigned long fclk; unsigned long hclk; unsigned long pclk; int ptr; xtal_clk = clk_get(NULL, "xtal"); xtal = clk_get_rate(xtal_clk); clk_put(xtal_clk); pll = get_mpll(mpllcon, xtal); clk_msysclk.clk.rate = pll; fclk = pll / get_fdiv(clkdiv0); hclk = s3c2443_prediv_getrate(&clk_prediv); hclk /= s3c2443_get_hdiv(clkdiv0); pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1); s3c24xx_setup_clocks(fclk, hclk, pclk); printk("CPU: MPLL %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n", (mpllcon & S3C2443_PLLCON_OFF) ? "off":"on", print_mhz(pll), print_mhz(fclk), print_mhz(hclk), print_mhz(pclk)); for (ptr = 0; ptr < ARRAY_SIZE(clksrc_clks); ptr++) s3c_set_clksrc(&clksrc_clks[ptr], true); /* ensure usb bus clock is within correct rate of 48MHz */ if (clk_get_rate(&clk_usb_bus_host.clk) != (48 * 1000 * 1000)) { printk(KERN_INFO "Warning: USB host bus not at 48MHz\n"); clk_set_rate(&clk_usb_bus_host.clk, 48*1000*1000); } printk("CPU: EPLL %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n", (epllcon & S3C2443_PLLCON_OFF) ? "off":"on", print_mhz(clk_get_rate(&clk_epll)), print_mhz(clk_get_rate(&clk_usb_bus))); } static struct clk *clks[] __initdata = { &clk_prediv, &clk_mpllref, &clk_mdivclk, &clk_ext, &clk_epll, &clk_usb_bus, &clk_armdiv, }; static struct clksrc_clk *clksrcs[] __initdata = { &clk_i2s_eplldiv, &clk_i2s, &clk_usb_bus_host, &clk_epllref, &clk_esysclk, &clk_msysclk, &clk_arm, }; void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll, fdiv_fn get_fdiv, unsigned int *divs, int nr_divs, int divmask) { int ptr; armdiv = divs; nr_armdiv = nr_divs; armdivmask = divmask; /* s3c2443 parents h and p clocks from prediv */ clk_h.parent = &clk_prediv; clk_p.parent = &clk_prediv; clk_usb_bus.parent = &clk_usb_bus_host.clk; clk_epll.parent = &clk_epllref.clk; s3c24xx_register_baseclocks(xtal); s3c24xx_register_clocks(clks, ARRAY_SIZE(clks)); for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++) s3c_register_clksrc(clksrcs[ptr], 1); s3c_register_clksrc(clksrc_clks, ARRAY_SIZE(clksrc_clks)); s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks)); /* See s3c2443/etc notes on disabling clocks at init time */ s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off)); s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off)); s3c2443_common_setup_clocks(get_mpll, get_fdiv); }