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Subject[PATCH v2 6/6] ARM: davinci: da850: configure system configuration chip(CFGCHIP3) for emac
Date
From: Lad, Prabhakar <prabhakar.lad@ti.com>

The system configuration chip CFGCHIP3, controls the emac module.
This patch appropriately configures this register for emac and
sets DA850_MII_MDIO_CLKEN_PIN GPIO pin appropriately.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: netdev@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Heiko Schocher <hs@denx.de>
---
arch/arm/mach-davinci/da8xx-dt.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index e533a0a..4a096e3 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -8,6 +8,7 @@
* published by the Free Software Foundation.
*/
#include <linux/io.h>
+#include <linux/gpio.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/irqdomain.h>
@@ -39,6 +40,32 @@ static void __init da8xx_init_irq(void)

#ifdef CONFIG_ARCH_DAVINCI_DA850

+static void __init da8xx_config_emac(void)
+{
+#define DA850_MII_MDIO_CLKEN_PIN GPIO_TO_PIN(2, 6)
+#define DA850_EMAC_MODE_SELECT BIT(8)
+ void __iomem *cfg_chip3_base;
+ int ret;
+ u32 val;
+
+ cfg_chip3_base = DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG);
+
+ val = __raw_readl(cfg_chip3_base);
+ val &= ~DA850_EMAC_MODE_SELECT;
+ /* configure the CFGCHIP3 register for MII */
+ __raw_writel(val, cfg_chip3_base);
+ pr_info("EMAC: MII PHY configured\n");
+
+ ret = gpio_request(DA850_MII_MDIO_CLKEN_PIN, "mdio_clk_en");
+ if (ret) {
+ pr_warn("Cannot open GPIO %d\n",
+ DA850_MII_MDIO_CLKEN_PIN);
+ return;
+ }
+ /* Enable/Disable MII MDIO clock */
+ gpio_direction_output(DA850_MII_MDIO_CLKEN_PIN, 0);
+}
+
struct of_dev_auxdata da8xx_auxdata[] __initdata = {
OF_DEV_AUXDATA("ti,davinci_mdio", 0x01e24000, "davinci_mdio.0", NULL),
OF_DEV_AUXDATA("ti,davinci-dm6467-emac", 0x01e20000, "davinci_emac.1",
@@ -52,6 +79,7 @@ static void __init da850_init_machine(void)
da8xx_auxdata, NULL);

da8xx_uart_clk_enable();
+ da8xx_config_emac();
}

static const char *da850_boards_compat[] __initdata = {
--
1.7.4.1


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