From: Juergen Beisert <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 3/8] ARM/Samsung: add the clock tree support for the S3C6410 SoC
Date: Sat, 21 Jul 2012 12:04:28 +0200 [thread overview]
Message-ID: <1342865073-5209-4-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1342865073-5209-1-git-send-email-jbe@pengutronix.de>
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
arch/arm/mach-samsung/Makefile | 1 +
arch/arm/mach-samsung/clocks-s3c64xx.c | 296 ++++++++++++++++++++
arch/arm/mach-samsung/include/mach/s3c-clocks.h | 3 +
.../arm/mach-samsung/include/mach/s3c64xx-clocks.h | 58 ++++
drivers/serial/serial_s3c.c | 3 +
5 files changed, 361 insertions(+)
create mode 100644 arch/arm/mach-samsung/clocks-s3c64xx.c
create mode 100644 arch/arm/mach-samsung/include/mach/s3c64xx-clocks.h
diff --git a/arch/arm/mach-samsung/Makefile b/arch/arm/mach-samsung/Makefile
index 40180d7..807e91b 100644
--- a/arch/arm/mach-samsung/Makefile
+++ b/arch/arm/mach-samsung/Makefile
@@ -2,4 +2,5 @@ obj-y += s3c-timer.o generic.o
obj-lowlevel-$(CONFIG_ARCH_S3C24xx) += lowlevel-s3c24x0.o
obj-lowlevel-$(CONFIG_ARCH_S5PCxx) += lowlevel-s5pcxx.o
obj-$(CONFIG_ARCH_S3C24xx) += gpio-s3c24x0.o clocks-s3c24xx.o mem-s3c24x0.o
+obj-$(CONFIG_ARCH_S3C64xx) += clocks-s3c64xx.o
obj-$(CONFIG_S3C_LOWLEVEL_INIT) += $(obj-lowlevel-y)
diff --git a/arch/arm/mach-samsung/clocks-s3c64xx.c b/arch/arm/mach-samsung/clocks-s3c64xx.c
new file mode 100644
index 0000000..a4beaf7
--- /dev/null
+++ b/arch/arm/mach-samsung/clocks-s3c64xx.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2012 Juergen Beisert
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <init.h>
+#include <clock.h>
+#include <io.h>
+#include <asm-generic/div64.h>
+#include <mach/s3c-iomap.h>
+#include <mach/s3c-generic.h>
+#include <mach/s3c-clocks.h>
+
+/*
+ * The main clock tree:
+ *
+ * ref_in ----o-----------\
+ * | MUX -o------------\
+ * | / ^ | MUX --- DIV_APLL ------- ARMCLK -> CPU core
+ * o--- APLL -- | | / |
+ * | | o--/2 ------- |
+ * | APLL_SEL | |<-MISC_CON_SYN667
+ * | \ |
+ * o-----------\ MUX-o-------\ |
+ * | MUX--/ ^ | MUX --- DIV -o--------- HCLKx2 -> SDRAM (max. 266 MHz)
+ * | / ^ | | / |
+ * o---- MPLL-- | | o--/5 -- o-- DIV -- HCLK -> AXI / AHB (max. 133 MHz)
+ * | | | |
+ * | MPLL_SEL OTHERS_CLK_SELECT o-- DIV -- PCLK -> APB (max. 66 MHz)
+ * |
+ * o-----------\
+ * | MUX---- to various hardware
+ * | / ^
+ * o---- EPLL-- EPLL_SEL
+ *
+ */
+
+static unsigned s3c_get_apllclk(void)
+{
+ uint32_t m, p, s, reg_val;
+
+ if (!(readl(S3C_CLK_SRC) & S3C_CLK_SRC_FOUTAPLL))
+ return S3C64XX_CLOCK_REFERENCE;
+
+ reg_val = readl(S3C_APLLCON);
+ m = S3C_APLLCON_GET_MDIV(reg_val);
+ p = S3C_APLLCON_GET_PDIV(reg_val);
+ s = S3C_APLLCON_GET_SDIV(reg_val);
+
+ return (S3C64XX_CLOCK_REFERENCE * m) / (p << s);
+}
+
+uint32_t s3c_get_mpllclk(void)
+{
+ uint32_t m, p, s, reg_val;
+
+ if (!(readl(S3C_CLK_SRC) & S3C_CLK_SRC_FOUTMPLL))
+ return S3C64XX_CLOCK_REFERENCE;
+
+ reg_val = readl(S3C_MPLLCON);
+ m = S3C_MPLLCON_GET_MDIV(reg_val);
+ p = S3C_MPLLCON_GET_PDIV(reg_val);
+ s = S3C_MPLLCON_GET_SDIV(reg_val);
+
+ return (S3C64XX_CLOCK_REFERENCE * m) / (p << s);
+}
+
+unsigned s3c_get_epllclk(void)
+{
+ u32 m, p, s, k, reg0_val, reg1_val;
+ u64 tmp;
+
+ if (!(readl(S3C_CLK_SRC) & S3C_CLK_SRC_FOUTEPLL))
+ return S3C64XX_CLOCK_REFERENCE;
+
+ reg0_val = readl(S3C_EPLLCON0);
+ reg1_val = readl(S3C_EPLLCON1);
+ m = S3C_EPLLCON0_GET_MDIV(reg0_val);
+ p = S3C_EPLLCON0_GET_PDIV(reg0_val);
+ s = S3C_EPLLCON0_GET_SDIV(reg0_val);
+ k = S3C_EPLLCON1_GET_KDIV(reg1_val);
+
+ tmp = S3C64XX_CLOCK_REFERENCE;
+ tmp *= (m << 16) + k;
+ do_div(tmp, (p << s));
+
+ return (unsigned)tmp >> 16;
+}
+
+uint32_t s3c_get_fclk(void)
+{
+ unsigned clk;
+
+ clk = s3c_get_apllclk();
+ if (readl(S3C_MISC_CON) & S3C_MISC_CON_SYN667)
+ clk /= 2;
+
+ return clk / (S3C_CLK_DIV0_GET_ADIV(readl(S3C_CLK_DIV0)) + 1);
+}
+
+static unsigned s3c_get_hclk_in(void)
+{
+ unsigned clk;
+
+ if (readl(S3C_OTHERS) & S3C_OTHERS_CLK_SELECT)
+ clk = s3c_get_apllclk();
+ else
+ clk = s3c_get_mpllclk();
+
+ if (readl(S3C_MISC_CON) & S3C_MISC_CON_SYN667)
+ clk /= 5;
+
+ return clk;
+}
+
+static unsigned s3c_get_hclkx2(void)
+{
+ return s3c_get_hclk_in() /
+ (S3C_CLK_DIV0_GET_HCLK2(readl(S3C_CLK_DIV0)) + 1);
+}
+
+uint32_t s3c_get_hclk(void)
+{
+ return s3c_get_hclkx2() /
+ (S3C_CLK_DIV0_GET_HCLK(readl(S3C_CLK_DIV0)) + 1);
+}
+
+uint32_t s3c_get_pclk(void)
+{
+ return s3c_get_hclkx2() /
+ (S3C_CLK_DIV0_GET_PCLK(readl(S3C_CLK_DIV0)) + 1);
+}
+
+static void s3c_init_mpll_dout(void)
+{
+ unsigned reg;
+
+ /* keep it at the same frequency as HCLKx2 */
+ reg = readl(S3C_CLK_DIV0) | S3C_CLK_DIV0_SET_MPLL_DIV(1); /* e.g. / 2 */
+ writel(reg, S3C_CLK_DIV0);
+}
+
+/* configure and enable UCLK1 */
+static int s3c_init_uart_clock(void)
+{
+ unsigned reg;
+
+ s3c_init_mpll_dout(); /* to have a reliable clock source */
+
+ /* source the UART clock from the MPLL, currently *not* from EPLL */
+ reg = readl(S3C_CLK_SRC) | S3C_CLK_SRC_UARTMPLL;
+ writel(reg, S3C_CLK_SRC);
+
+ /* keep UART clock at the same frequency than the PCLK */
+ reg = readl(S3C_CLK_DIV2) & ~S3C_CLK_DIV2_UART_MASK;
+ reg |= S3C_CLK_DIV2_SET_UART(0x3); /* / 4 */
+ writel(reg, S3C_CLK_DIV2);
+
+ /* ensure this very special clock is running */
+ reg = readl(S3C_SCLK_GATE) | S3C_SCLK_GATE_UART;
+ writel(reg, S3C_SCLK_GATE);
+
+ return 0;
+}
+core_initcall(s3c_init_uart_clock);
+
+/*
+ * The UART related clock path:
+ *
+ * PCLK --------------------------------------o-----0-\
+ * ???? -------------------------------UCLK0--|-----1--\MUX----- UART
+ * MPLL -----DIV0------\ +-----2--/ ^
+ * MUX---DIV2------UCLK1--------3-/ UART setting (source)
+ * EPLL ---------------/
+ * ^SRC_UARTMPLL
+ */
+unsigned s3c_get_uart_clk(unsigned source)
+{
+ u32 reg;
+ unsigned clk, pdiv, uartpdiv;
+
+ switch (source) {
+ default: /* PCLK */
+ clk = s3c_get_pclk();
+ pdiv = uartpdiv = 1;
+ break;
+ case 1: /* UCLK0 */
+ clk = 0;
+ pdiv = uartpdiv = 1; /* TODO */
+ break;
+ case 3: /* UCLK1 */
+ reg = readl(S3C_CLK_SRC);
+ if (reg & S3C_CLK_SRC_UARTMPLL) {
+ clk = s3c_get_mpllclk();
+ pdiv = S3C_CLK_DIV0_GET_MPLL_DIV(readl(S3C_CLK_DIV0)) + 1;
+ } else {
+ clk = s3c_get_epllclk();
+ pdiv = 1;
+ }
+ uartpdiv = S3C_CLK_DIV2_GET_UART(readl(S3C_CLK_DIV2)) + 1;
+ break;
+ }
+
+ return clk / pdiv / uartpdiv;
+}
+
+/*
+ * The MMC related clock path:
+ *
+ * MMCx_SEL
+ * |
+ * EPLLout --0-\ v
+ * MPLLout --1--\MUX----SCLK_MMCx----DIV_MMCx------>HSMMCx
+ * EPLLin --2--/ on/off / 1..16
+ * 27 MHz --3-/
+ *
+ * The datasheet is not very precise here, so the schematic shown above was
+ * made by checking various bits in the SYSCON.
+ */
+unsigned s3c_get_hsmmc_clk(int id)
+{
+ u32 sel, div, sclk = readl(S3C_SCLK_GATE);
+ unsigned bclk;
+
+ if (!(sclk & S3C_SCLK_GATE_MMC(id)))
+ return 0; /* disabled */
+
+ sel = S3C_CLK_SRC_GET_MMC_SEL(id, readl(S3C_CLK_SRC));
+ switch (sel) {
+ case 0:
+ bclk = s3c_get_epllclk();
+ break;
+ case 1:
+ bclk = s3c_get_mpllclk();
+ break;
+ case 2:
+ bclk = S3C64XX_CLOCK_REFERENCE;
+ break;
+ case 3:
+ bclk = 27000000;
+ break;
+ }
+
+ div = S3C_CLK_DIV0_GET_MMC(id, readl(S3C_CLK_DIV0)) + 1;
+
+ return bclk / div;
+}
+
+void s3c_set_hsmmc_clk(int id, int src, unsigned div)
+{
+ u32 reg;
+
+ if (!div)
+ div = 1;
+
+ writel(readl(S3C_SCLK_GATE) & ~S3C_SCLK_GATE_MMC(id), S3C_SCLK_GATE);
+
+ /* select the new clock source */
+ reg = readl(S3C_CLK_SRC) & ~S3C_CLK_SRC_SET_MMC_SEL(id, ~0);
+ reg |= S3C_CLK_SRC_SET_MMC_SEL(id, src);
+ writel(reg, S3C_CLK_SRC);
+
+ /* select the new pre-divider */
+ reg = readl(S3C_CLK_DIV0) & ~ S3C_CLK_DIV0_SET_MMC(id, ~0);
+ reg |= S3C_CLK_DIV0_SET_MMC(id, div - 1);
+ writel(reg, S3C_CLK_DIV0);
+
+ /* calling this function implies enabling of the clock */
+ writel(readl(S3C_SCLK_GATE) | S3C_SCLK_GATE_MMC(id), S3C_SCLK_GATE);
+}
+
+int s3c64xx_dump_clocks(void)
+{
+ printf("refclk: %7d kHz\n", S3C64XX_CLOCK_REFERENCE / 1000);
+ printf("apll: %7d kHz\n", s3c_get_apllclk() / 1000);
+ printf("mpll: %7d kHz\n", s3c_get_mpllclk() / 1000);
+ printf("epll: %7d kHz\n", s3c_get_epllclk() / 1000);
+ printf("CPU: %7d kHz\n", s3c_get_fclk() / 1000);
+ printf("hclkx2: %7d kHz\n", s3c_get_hclkx2() / 1000);
+ printf("hclk: %7d kHz\n", s3c_get_hclk() / 1000);
+ printf("pclk: %7d kHz\n", s3c_get_pclk() / 1000);
+ return 0;
+}
+
+late_initcall(s3c64xx_dump_clocks);
diff --git a/arch/arm/mach-samsung/include/mach/s3c-clocks.h b/arch/arm/mach-samsung/include/mach/s3c-clocks.h
index f577306..6920ca9 100644
--- a/arch/arm/mach-samsung/include/mach/s3c-clocks.h
+++ b/arch/arm/mach-samsung/include/mach/s3c-clocks.h
@@ -25,6 +25,9 @@
#ifdef CONFIG_ARCH_S3C24xx
# include <mach/s3c24xx-clocks.h>
#endif
+#ifdef CONFIG_ARCH_S3C64xx
+# include <mach/s3c64xx-clocks.h>
+#endif
#ifdef CONFIG_ARCH_S5PCxx
# include <mach/s5pcxx-clocks.h>
#endif
diff --git a/arch/arm/mach-samsung/include/mach/s3c64xx-clocks.h b/arch/arm/mach-samsung/include/mach/s3c64xx-clocks.h
new file mode 100644
index 0000000..9646705
--- /dev/null
+++ b/arch/arm/mach-samsung/include/mach/s3c64xx-clocks.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2012 Juergen Beisert
+ *
+ * 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.
+ */
+
+#define S3C_APLLCON (S3C_CLOCK_POWER_BASE + 0x0c)
+# define S3C_APLLCON_GET_MDIV(x) (((x) >> 16) & 0x3ff)
+# define S3C_APLLCON_GET_PDIV(x) (((x) >> 8) & 0x3f)
+# define S3C_APLLCON_GET_SDIV(x) ((x) & 0x7)
+#define S3C_MPLLCON (S3C_CLOCK_POWER_BASE + 0x10)
+# define S3C_MPLLCON_GET_MDIV(x) (((x) >> 16) & 0x3ff)
+# define S3C_MPLLCON_GET_PDIV(x) (((x) >> 8) & 0x3f)
+# define S3C_MPLLCON_GET_SDIV(x) ((x) & 0x7)
+#define S3C_EPLLCON0 (S3C_CLOCK_POWER_BASE + 0x14)
+# define S3C_EPLLCON0_GET_MDIV(x) (((x) >> 16) & 0x3ff)
+# define S3C_EPLLCON0_GET_PDIV(x) (((x) >> 8) & 0x3f)
+# define S3C_EPLLCON0_GET_SDIV(x) ((x) & 0x7)
+#define S3C_EPLLCON1 (S3C_CLOCK_POWER_BASE + 0x18)
+# define S3C_EPLLCON1_GET_KDIV(x) ((x) & 0xffff)
+#define S3C_CLKCON (S3C_CLOCK_POWER_BASE + 0xc)
+#define S3C_CLKSLOW (S3C_CLOCK_POWER_BASE + 0x10)
+#define S3C_CLKDIVN (S3C_CLOCK_POWER_BASE + 0x14)
+#define S3C_CLK_SRC (S3C_CLOCK_POWER_BASE + 0x01c)
+# define S3C_CLK_SRC_GET_MMC_SEL(x, v) (((v) >> (18 + (x * 2))) & 0x3)
+# define S3C_CLK_SRC_SET_MMC_SEL(x, v) (((v) & 0x3) << (18 + (x * 2)))
+# define S3C_CLK_SRC_UARTMPLL (1 << 13)
+# define S3C_CLK_SRC_FOUTEPLL (1 << 2)
+# define S3C_CLK_SRC_FOUTMPLL (1 << 1)
+# define S3C_CLK_SRC_FOUTAPLL (1 << 0)
+#define S3C_CLK_DIV0 (S3C_CLOCK_POWER_BASE + 0x020)
+# define S3C_CLK_DIV0_GET_ADIV(x) ((x) & 0xf)
+# define S3C_CLK_DIV0_GET_HCLK2(x) (((x) >> 9) & 0x7)
+# define S3C_CLK_DIV0_GET_HCLK(x) (((x) >> 8) & 0x1)
+# define S3C_CLK_DIV0_GET_PCLK(x) (((x) >> 12) & 0xf)
+# define S3C_CLK_DIV0_SET_MPLL_DIV(x) (((x) & 0x1) << 4)
+# define S3C_CLK_DIV0_GET_MPLL_DIV(x) (((x) >> 4) & 0x1)
+# define S3C_CLK_DIV0_GET_MMC(x, v) (((v) >> (4 * x)) & 0xf)
+# define S3C_CLK_DIV0_SET_MMC(x, v) (((v) & 0xf) << (4 * x))
+#define S3C_CLK_DIV2 (S3C_CLOCK_POWER_BASE + 0x028)
+# define S3C_CLK_DIV2_UART_MASK (0xf << 16)
+# define S3C_CLK_DIV2_SET_UART(x) ((x) << 16)
+# define S3C_CLK_DIV2_GET_UART(x) (((x) >> 16) & 0xf)
+#define S3C_SCLK_GATE (S3C_CLOCK_POWER_BASE + 0x038)
+# define S3C_SCLK_GATE_UART (1 << 5)
+# define S3C_SCLK_GATE_MMC(x) (1 << (24 + x))
+#define S3C_MISC_CON (S3C_CLOCK_POWER_BASE + 0x838)
+# define S3C_MISC_CON_SYN667 (1 << 19)
+#define S3C_OTHERS (S3C_CLOCK_POWER_BASE + 0x900)
+# define S3C_OTHERS_CLK_SELECT (1 << 6)
diff --git a/drivers/serial/serial_s3c.c b/drivers/serial/serial_s3c.c
index 53ac77f..0611f24 100644
--- a/drivers/serial/serial_s3c.c
+++ b/drivers/serial/serial_s3c.c
@@ -58,6 +58,9 @@ static unsigned s3c_select_arch_input_clock(void)
/* S3C24xx: 0=2=PCLK, 1=UEXTCLK, 3=FCLK/n */
if (IS_ENABLED(CONFIG_ARCH_S3C24xx))
return 0; /* use the internal PCLK */
+ /* S3C64xx: 0=2=PCLK, 1=UCLK0, 3=UCLK1 */
+ if (IS_ENABLED(CONFIG_ARCH_S3C64xx))
+ return 3; /* use the internal UCLK1 */
/* S5PCxx: 0=PCLK, 1=SCLK_UART */
if (IS_ENABLED(CONFIG_ARCH_S5PCxx))
return 0; /* use the internal PCLK */
--
1.7.10.4
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
next prev parent reply other threads:[~2012-07-21 10:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-21 10:04 [PATCH] Addd the Samsung S3C6410 SoC to Barebox Juergen Beisert
2012-07-21 10:04 ` [PATCH 1/8] ARM/Samsung: add S3C6410 SoC iomap Juergen Beisert
2012-07-21 10:04 ` [PATCH 2/8] ARM/Samsung: adapt the generic timer driver to support the S3C6410 SoC Juergen Beisert
2012-07-21 10:04 ` Juergen Beisert [this message]
2012-07-21 10:04 ` [PATCH 4/8] ARM/Samsung: add GPIO handling support for " Juergen Beisert
2012-07-21 10:04 ` [PATCH 5/8] ARM/Samsung: add generic S3C6410 SoC specific functions Juergen Beisert
2012-07-21 10:04 ` [PATCH 6/8] ARM/Samsung: add the S3C6410 SoC Juergen Beisert
2012-07-21 10:04 ` [PATCH 7/8] ARM/Samsung: add the Mini6410 platform as the first user of " Juergen Beisert
2012-07-21 10:04 ` [PATCH 8/8] ARM/Samsung: add the Tiny6410 platform as the second " Juergen Beisert
2012-07-28 15:10 [PATCHv2] Add the Samsung S3C6410 SoC to Barebox Juergen Beisert
2012-07-28 15:10 ` [PATCH 3/8] ARM/Samsung: add the clock tree support for the S3C6410 SoC Juergen Beisert
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1342865073-5209-4-git-send-email-jbe@pengutronix.de \
--to=jbe@pengutronix.de \
--cc=barebox@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox