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-rw-r--r--arch/arm/mach-s3c24xx/common-s3c2443.c670
1 files changed, 670 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/common-s3c2443.c b/arch/arm/mach-s3c24xx/common-s3c2443.c
new file mode 100644
index 0000000..4604315
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/common-s3c2443.c
@@ -0,0 +1,670 @@
+/*
+ * Common code for SoCs starting with the S3C2443
+ *
+ * Copyright (c) 2007, 2010 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/regs-s3c2443-clock.h>
+
+#include <plat/clock.h>
+#include <plat/clock-clksrc.h>
+#include <plat/cpu.h>
+
+#include <plat/cpu-freq.h>
+
+
+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.
+ */
+static 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,
+ },
+};
+
+/* hclk divider
+ *
+ * divides the prediv and provides the hclk.
+ */
+
+static unsigned long s3c2443_hclkdiv_getrate(struct clk *clk)
+{
+ unsigned long rate = clk_get_rate(clk->parent);
+ unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
+
+ clkdiv0 &= S3C2443_CLKDIV0_HCLKDIV_MASK;
+
+ return rate / (clkdiv0 + 1);
+}
+
+static struct clk_ops clk_h_ops = {
+ .get_rate = s3c2443_hclkdiv_getrate,
+};
+
+/* pclk divider
+ *
+ * divides the hclk and provides the pclk.
+ */
+
+static unsigned long s3c2443_pclkdiv_getrate(struct clk *clk)
+{
+ unsigned long rate = clk_get_rate(clk->parent);
+ unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
+
+ clkdiv0 = ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 1 : 0);
+
+ return rate / (clkdiv0 + 1);
+}
+
+static struct clk_ops clk_p_ops = {
+ .get_rate = s3c2443_pclkdiv_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[] = {
+ {
+ /* 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 clksrc_clk clk_esys_uart = {
+ /* 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 },
+};
+
+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 = "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 struct clk hsmmc1_clk = {
+ .name = "hsmmc",
+ .devname = "s3c-sdhci.1",
+ .parent = &clk_h,
+ .enable = s3c2443_clkcon_enable_h,
+ .ctrlbit = S3C2443_HCLKCON_HSMMC,
+};
+
+/* EPLLCON compatible enough to get on/off information */
+
+void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll)
+{
+ unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
+ unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
+ struct clk *xtal_clk;
+ unsigned long xtal;
+ unsigned long pll;
+ 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;
+ clk_mpll.rate = pll;
+
+ 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(clk_get_rate(&clk_armdiv)),
+ print_mhz(clk_get_rate(&clk_h)),
+ print_mhz(clk_get_rate(&clk_p)));
+
+ 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,
+ &hsmmc1_clk,
+};
+
+static struct clksrc_clk *clksrcs[] __initdata = {
+ &clk_i2s_eplldiv,
+ &clk_i2s,
+ &clk_usb_bus_host,
+ &clk_epllref,
+ &clk_esysclk,
+ &clk_msysclk,
+ &clk_arm,
+};
+
+static struct clk_lookup s3c2443_clk_lookup[] = {
+ CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
+ CLKDEV_INIT(NULL, "clk_uart_baud2", &clk_p),
+ CLKDEV_INIT(NULL, "clk_uart_baud3", &clk_esys_uart.clk),
+ CLKDEV_INIT("s3c-sdhci.1", "mmc_busclk.0", &hsmmc1_clk),
+};
+
+void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll,
+ unsigned int *divs, int nr_divs,
+ int divmask)
+{
+ int ptr;
+
+ armdiv = divs;
+ nr_armdiv = nr_divs;
+ armdivmask = divmask;
+
+ /* s3c2443 parents h clock from prediv */
+ clk_h.parent = &clk_prediv;
+ clk_h.ops = &clk_h_ops;
+
+ /* and p clock from h clock */
+ clk_p.parent = &clk_h;
+ clk_p.ops = &clk_p_ops;
+
+ 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));
+ clkdev_add_table(s3c2443_clk_lookup, ARRAY_SIZE(s3c2443_clk_lookup));
+
+ s3c2443_common_setup_clocks(get_mpll);
+}