[ARM] pxa: PXA3xx base support

Signed-off-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 216 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c
new file mode 100644
index 000000000000..39f0de8c189e
--- /dev/null
+++ b/arch/arm/mach-pxa/pxa3xx.c
@@ -0,0 +1,216 @@
+/*
+ * linux/arch/arm/mach-pxa/pxa3xx.c
+ *
+ * code specific to pxa3xx aka Monahans
+ *
+ * Copyright (C) 2006 Marvell International Ltd.
+ *
+ * 2007-09-02: eric miao <eric.y.miao@gmail.com>
+ *             initial version
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/pxa3xx-regs.h>
+#include <asm/arch/ohci.h>
+#include <asm/arch/pm.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/ssp.h>
+
+#include "generic.h"
+#include "devices.h"
+#include "clock.h"
+
+/* Crystal clock: 13MHz */
+#define BASE_CLK	13000000
+
+/* Ring Oscillator Clock: 60MHz */
+#define RO_CLK		60000000
+
+#define ACCR_D0CS	(1 << 26)
+
+/* crystal frequency to static memory controller multiplier (SMCFS) */
+static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
+
+/* crystal frequency to HSIO bus frequency multiplier (HSS) */
+static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
+
+/*
+ * Get the clock frequency as reflected by CCSR and the turbo flag.
+ * We assume these values have been applied via a fcs.
+ * If info is not 0 we also display the current settings.
+ */
+unsigned int pxa3xx_get_clk_frequency_khz(int info)
+{
+	unsigned long acsr, xclkcfg;
+	unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
+
+	/* Read XCLKCFG register turbo bit */
+	__asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
+	t = xclkcfg & 0x1;
+
+	acsr = ACSR;
+
+	xl  = acsr & 0x1f;
+	xn  = (acsr >> 8) & 0x7;
+	hss = (acsr >> 14) & 0x3;
+
+	XL = xl * BASE_CLK;
+	XN = xn * XL;
+
+	ro = acsr & ACCR_D0CS;
+
+	CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
+	HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
+
+	if (info) {
+		pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
+			RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
+			(ro) ? "" : "in");
+		pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
+			XL / 1000000, (XL % 1000000) / 10000, xl);
+		pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
+			XN / 1000000, (XN % 1000000) / 10000, xn,
+			(t) ? "" : "in");
+		pr_info("HSIO bus clock: %d.%02dMHz\n",
+			HSS / 1000000, (HSS % 1000000) / 10000);
+	}
+
+	return CLK;
+}
+
+/*
+ * Return the current static memory controller clock frequency
+ * in units of 10kHz
+ */
+unsigned int pxa3xx_get_memclk_frequency_10khz(void)
+{
+	unsigned long acsr;
+	unsigned int smcfs, clk = 0;
+
+	acsr = ACSR;
+
+	smcfs = (acsr >> 23) & 0x7;
+	clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
+
+	return (clk / 10000);
+}
+
+/*
+ * Return the current HSIO bus clock frequency
+ */
+static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
+{
+	unsigned long acsr;
+	unsigned int hss, hsio_clk;
+
+	acsr = ACSR;
+
+	hss = (acsr >> 14) & 0x3;
+	hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
+
+	return hsio_clk;
+}
+
+static void clk_pxa3xx_cken_enable(struct clk *clk)
+{
+	unsigned long mask = 1ul << (clk->cken & 0x1f);
+
+	local_irq_disable();
+
+	if (clk->cken < 32)
+		CKENA |= mask;
+	else
+		CKENB |= mask;
+
+	local_irq_enable();
+}
+
+static void clk_pxa3xx_cken_disable(struct clk *clk)
+{
+	unsigned long mask = 1ul << (clk->cken & 0x1f);
+
+	local_irq_disable();
+
+	if (clk->cken < 32)
+		CKENA &= ~mask;
+	else
+		CKENB &= ~mask;
+
+	local_irq_enable();
+}
+
+static const struct clkops clk_pxa3xx_hsio_ops = {
+	.enable		= clk_pxa3xx_cken_enable,
+	.disable	= clk_pxa3xx_cken_disable,
+	.getrate	= clk_pxa3xx_hsio_getrate,
+};
+
+static struct clk pxa3xx_clks[] = {
+	INIT_CK("LCDCLK", LCD,    &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
+	INIT_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
+
+	INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
+	INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
+	INIT_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
+
+	INIT_CKEN("I2CCLK",  I2C,  32842000, 0, &pxa_device_i2c.dev),
+	INIT_CKEN("UDCCLK",  UDC,  48000000, 5, &pxa_device_udc.dev),
+};
+
+void __init pxa3xx_init_irq(void)
+{
+	/* enable CP6 access */
+	u32 value;
+	__asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
+	value |= (1 << 6);
+	__asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
+
+	pxa_init_irq_low();
+	pxa_init_irq_high();
+	pxa_init_irq_gpio(128);
+}
+
+/*
+ * device registration specific to PXA3xx.
+ */
+
+static struct platform_device *devices[] __initdata = {
+	&pxa_device_mci,
+	&pxa_device_udc,
+	&pxa_device_fb,
+	&pxa_device_ffuart,
+	&pxa_device_btuart,
+	&pxa_device_stuart,
+	&pxa_device_i2c,
+	&pxa_device_i2s,
+	&pxa_device_ficp,
+	&pxa_device_rtc,
+};
+
+static int __init pxa3xx_init(void)
+{
+	int ret = 0;
+
+	if (cpu_is_pxa3xx()) {
+		clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
+
+		if ((ret = pxa_init_dma(32)))
+			return ret;
+
+		return platform_add_devices(devices, ARRAY_SIZE(devices));
+	}
+	return 0;
+}
+
+subsys_initcall(pxa3xx_init);