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From: Juergen Beisert <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 16/18] ARM/Samsung: add generic S3C6410 SoC specific functions
Date: Fri, 13 Jul 2012 21:01:08 +0200	[thread overview]
Message-ID: <1342206070-29698-17-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1342206070-29698-1-git-send-email-jbe@pengutronix.de>

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 arch/arm/mach-samsung/Makefile                   |    2 +-
 arch/arm/mach-samsung/include/mach/s3c-generic.h |   13 +++++
 arch/arm/mach-samsung/mem-s3c64xx.c              |   65 ++++++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-samsung/mem-s3c64xx.c

diff --git a/arch/arm/mach-samsung/Makefile b/arch/arm/mach-samsung/Makefile
index 5187170..9402289 100644
--- a/arch/arm/mach-samsung/Makefile
+++ b/arch/arm/mach-samsung/Makefile
@@ -3,6 +3,6 @@ obj-lowlevel-$(CONFIG_ARCH_S3C24xx) += lowlevel-s3c24x0.o
 obj-lowlevel-$(CONFIG_ARCH_S3C64xx) += lowlevel-s3c64x0.o
 obj-lowlevel-$(CONFIG_ARCH_S5PCxx) += lowlevel-s5pcxx.o
 obj-$(CONFIG_ARCH_S3C24xx) += gpio-s3c24x0.o clocks-s3c24xx.o mem-s3c24x0.o
-obj-$(CONFIG_ARCH_S3C64xx) += gpio-s3c64xx.o clocks-s3c64xx.o
+obj-$(CONFIG_ARCH_S3C64xx) += gpio-s3c64xx.o clocks-s3c64xx.o mem-s3c64xx.o
 obj-$(CONFIG_ARCH_S5PCxx) += gpio-s5pcxx.o clocks-s5pcxx.o mem-s5pcxx.o
 obj-$(CONFIG_S3C_LOWLEVEL_INIT) += $(obj-lowlevel-y)
diff --git a/arch/arm/mach-samsung/include/mach/s3c-generic.h b/arch/arm/mach-samsung/include/mach/s3c-generic.h
index 329c2b4..42e8c5f 100644
--- a/arch/arm/mach-samsung/include/mach/s3c-generic.h
+++ b/arch/arm/mach-samsung/include/mach/s3c-generic.h
@@ -47,3 +47,16 @@ void s5p_init_dram_bank_lpddr2(phys_addr_t base, uint32_t mc0, uint32_t mc1, int
 void s5p_init_dram_bank_ddr2(phys_addr_t base, uint32_t mc0, uint32_t mc1, int bus16);
 uint32_t s5p_get_memory_size(void);
 #endif
+
+#ifdef CONFIG_ARCH_S3C64xx
+unsigned s3c6410_get_memory_size(void);
+struct s3c6410_chipselect {
+	unsigned adr_setup_t; /* in [ns] */
+	unsigned access_setup_t; /* in [ns] */
+	unsigned access_t; /* in [ns] */
+	unsigned cs_hold_t; /* in [ns] */
+	unsigned adr_hold_t; /* in [ns] */
+	unsigned char width; /* 8 or 16 */
+};
+int s3c6410_setup_chipselect(int, const struct s3c6410_chipselect*);
+#endif
diff --git a/arch/arm/mach-samsung/mem-s3c64xx.c b/arch/arm/mach-samsung/mem-s3c64xx.c
new file mode 100644
index 0000000..f312fb2
--- /dev/null
+++ b/arch/arm/mach-samsung/mem-s3c64xx.c
@@ -0,0 +1,65 @@
+/*
+ * 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 <errno.h>
+#include <io.h>
+#include <mach/s3c-iomap.h>
+#include <mach/s3c-generic.h>
+
+#define S3C_DRAMC_CHIP_0_CFG (S3C_DRAMC + 0x200)
+
+/* note: this routine honors the first memory bank only */
+unsigned s3c6410_get_memory_size(void)
+{
+	unsigned reg = readl(S3C_DRAMC_CHIP_0_CFG) & 0xff;
+
+	return ~(reg << 24) + 1;
+}
+
+/* configure the timing of one of the available external chip select lines */
+int s3c6410_setup_chipselect(int no, const struct s3c6410_chipselect *c)
+{
+	unsigned per_t = 1000000000 / s3c_get_hclk();
+	unsigned tacs, tcos, tacc, tcoh, tcah, shift;
+	uint32_t reg;
+
+	/* start of cycle to chip select assertion (= address/data setup) */
+	tacs = DIV_ROUND_UP(c->adr_setup_t, per_t);
+	/* start of CS to read/write assertion (= access setup) */
+	tcos = DIV_ROUND_UP(c->access_setup_t, per_t);
+	/* length of read/write assertion (= access lenght) */
+	tacc = DIV_ROUND_UP(c->access_t, per_t) - 1;
+	/* CS hold after access is finished */
+	tcoh = DIV_ROUND_UP(c->cs_hold_t, per_t);
+	/* adress/data hold after CS is deasserted */
+	tcah = DIV_ROUND_UP(c->adr_hold_t, per_t);
+
+	shift = no * 4;
+	reg = readl(S3C_SROM_BW) & ~(0xf << shift);
+	if (c->width == 16)
+		reg |= 0x1 << shift;
+	writel(reg, S3C_SROM_BW);
+#ifdef DEBUG
+	if (tacs > 15 || tcos > 15 || tacc > 31 || tcoh > 15 || tcah > 15) {
+		pr_err("At least one of the timings are invalid\n");
+		return -EINVAL;
+	}
+	pr_info("Will write 0x%08X\n", tacs << 28 | tcos << 24 | tacc << 16 |
+					tcoh << 12 | tcah << 8);
+#endif
+	writel(tacs << 28 | tcos << 24 | tacc << 16 | tcoh << 12 | tcah << 8,
+						S3C_SROM_BC0 + shift);
+
+	return 0;
+}
-- 
1.7.10.4


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  parent reply	other threads:[~2012-07-13 19:01 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-13 19:00 [RFC] Inclusion of the Samsung S3C6410 SoC Juergen Beisert
2012-07-13 19:00 ` [PATCH 01/18] ARM/Samsung: be able to include the nand header multiple times Juergen Beisert
2012-07-13 19:00 ` [PATCH 02/18] ARM/Samsung: unify device registration for the S3C24XX SoCs Juergen Beisert
2012-07-16  7:21   ` Sascha Hauer
2012-07-16  7:37     ` Juergen Beisert
2012-07-13 19:00 ` [PATCH 03/18] ARM/Samsung: follow the name style of the other source files in this directory Juergen Beisert
2012-07-13 19:00 ` [PATCH 04/18] Samsung/serial: remove more ugly ifdef lines Juergen Beisert
2012-07-13 19:00 ` [PATCH 05/18] Samsung/serial: make the clock source configureable Juergen Beisert
2012-07-16  7:20   ` Sascha Hauer
2012-07-13 19:00 ` [PATCH 06/18] Samsung/serial: make the code more readable Juergen Beisert
2012-07-13 19:00 ` [PATCH 07/18] Samsung/serial: there is no need to ifdef these register defines Juergen Beisert
2012-07-13 19:01 ` [PATCH 08/18] Samsung/serial: there is no need to ifdef the slot table Juergen Beisert
2012-07-13 19:01 ` [PATCH 09/18] Samsung/serial: move the decision about an improved UART into Kconfig Juergen Beisert
2012-07-13 19:01 ` [PATCH 10/18] Samsung/serial: unify UCON register settings Juergen Beisert
2012-07-13 19:01 ` [PATCH 11/18] ARM/Samsung: add generic lowlevel init Juergen Beisert
2012-07-16  7:22   ` Sascha Hauer
2012-07-13 19:01 ` [PATCH 12/18] ARM/Samsung: add S3C6410 SoC iomap Juergen Beisert
2012-07-13 19:01 ` [PATCH 13/18] ARM/Samsung: adapt the generic timer driver to support the S3C6410 SoC Juergen Beisert
2012-07-13 19:01 ` [PATCH 14/18] ARM/Samsung: add the clock tree support for " Juergen Beisert
2012-07-13 19:01 ` [PATCH 15/18] ARM/Samsung: add GPIO handling " Juergen Beisert
2012-07-13 19:01 ` Juergen Beisert [this message]
2012-07-13 19:01 ` [PATCH 17/18] ARM/Samsung: add " Juergen Beisert
2012-07-13 19:01 ` [PATCH 18/18] ARM/Samsung: add the Mini6410 platform as the first user of " Juergen Beisert

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