ipq806x: Add support for GPIO operations

Basic support for ipq806x GPIO CFG and IO reg operations
Reference: IPQ806x PRM, u-boot arch-ipq806x/gpio.*
BUG=None
BRANCH=None
TEST=Compiled successfully

Original-Change-Id: Ia0a9f288de3ac7bdb1cd4acbf44ba46af4dcc4e2
Original-Reviewed-on: https://chromium-review.googlesource.com/194217
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 0b48e6655e63b467fe79d52149be01d23a2a3712)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I09e222f35b4b20c8eb901f33cf4451085c4c99cc
Reviewed-on: http://review.coreboot.org/7266
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/soc/qualcomm/ipq806x/Makefile.inc

@@ -1,8 +1,11 @@
 bootblock-y += cbfs.c
+bootblock-y += gpio.c
 
 romstage-y += cbfs.c
+romstage-y += gpio.c
 
 ramstage-y += cbfs.c
+ramstage-y += gpio.c
 
 ifeq ($(CONFIG_USE_BLOBS),y)
 
@@ -27,4 +30,4 @@ $(objcbfs)/bootblock.bin: ./$(call strip_quotes,$(CONFIG_SBL_BLOB)) \
 
 endif
 
-INCLUDES += -Isrc/soc/qualcomm/ipq806x/include
+CPPFLAGS_common += -Isrc/soc/qualcomm/ipq806x/include

src/soc/qualcomm/ipq806x/gpio.c

@@ -28,16 +28,29 @@
  * SUCH DAMAGE.
  */
 
-#include <asm/arch-ipq806x/iomap.h>
+#include <iomap.h>
-#include <asm/arch-ipq806x/gpio.h>
+#include <gpio.h>
-#include <asm/io.h>
+#include <arch/io.h>
+
+/*******************************************************
+Function description: check for invalid GPIO #
+Arguments :
+gpio_t gpio - Gpio number
+
+Return : GPIO Valid(0)/Invalid(1)
+*******************************************************/
+
+static inline int gpio_not_valid(gpio_t gpio)
+{
+	return (gpio > GPIO_MAX_NUM);
+}
+
 
 /*******************************************************
 Function description: configure GPIO functinality
 Arguments :
-unsigned int gpio - Gpio number
+gpio_t gpio - Gpio number
 unsigned int func - Functionality number
-unsigned int dir  - direction 0- i/p, 1- o/p
 unsigned int pull - pull up/down, no pull range(0-3)
 unsigned int drvstr - range (0 - 7)-> (2- 16)MA steps of 2
 unsigned int enable - 1 - Disable, 2- Enable.
@@ -46,17 +59,101 @@ Return : None
 *******************************************************/
 
 
-void gpio_tlmm_config(unsigned int gpio, unsigned int func,
+void gpio_tlmm_config_set(gpio_t gpio, unsigned int func,
-                      unsigned int dir, unsigned int pull,
+			  unsigned int pull, unsigned int drvstr,
-                      unsigned int drvstr, unsigned int enable)
+			  unsigned int enable)
 {
         unsigned int val = 0;
-        val |= pull;
+
-        val |= func << 2;
+	if (gpio_not_valid(gpio))
-        val |= drvstr << 6;
+		return;
-        val |= enable << 9;
+
+        val |= (pull & GPIO_CFG_PULL_MASK) << GPIO_CFG_PULL_SHIFT;
+        val |= (func & GPIO_CFG_FUNC_MASK) << GPIO_CFG_FUNC_SHIFT;
+        val |= (drvstr & GPIO_CFG_DRV_MASK) << GPIO_CFG_DRV_SHIFT;
+        val |= (enable & GPIO_CFG_OE_MASK) << GPIO_CFG_OE_SHIFT;
         unsigned int *addr = (unsigned int *)GPIO_CONFIG_ADDR(gpio);
         writel(val, addr);
-        return;
 }
 
+/*******************************************************
+Function description: Get GPIO configuration
+Arguments :
+gpio_t gpio - Gpio number
+unsigned int *func - Functionality number
+unsigned int *pull - pull up/down, no pull range(0-3)
+unsigned int *drvstr - range (0 - 7)-> (2- 16)MA steps of 2
+unsigned int *enable - 1 - Disable, 2- Enable.
+
+Return : None
+*******************************************************/
+
+
+void gpio_tlmm_config_get(gpio_t gpio, unsigned int *func,
+			  unsigned int *pull, unsigned int *drvstr,
+			  unsigned int *enable)
+{
+        unsigned int val;
+
+	if (gpio_not_valid(gpio))
+		return;
+
+        unsigned int *addr = (unsigned int *)GPIO_CONFIG_ADDR(gpio);
+	val = readl(addr);
+
+	*pull = (val >> GPIO_CFG_PULL_SHIFT) & GPIO_CFG_PULL_MASK;
+	*func = (val >> GPIO_CFG_FUNC_SHIFT) & GPIO_CFG_FUNC_MASK;
+	*drvstr = (val >> GPIO_CFG_DRV_SHIFT) & GPIO_CFG_DRV_MASK;
+	*enable = (val >> GPIO_CFG_OE_SHIFT) & GPIO_CFG_OE_MASK;
+}
+
+/*******************************************************
+Function description: configure GPIO IO functinality
+Arguments :
+gpio_t gpio - Gpio number
+unsigned int out - Controls value of GPIO output
+
+Return : None
+*******************************************************/
+
+void gpio_io_config_set(gpio_t gpio, unsigned int out)
+{
+        unsigned int val;
+
+	if (gpio_not_valid(gpio))
+		return;
+
+	unsigned int *addr = (unsigned int *)GPIO_CONFIG_ADDR(gpio);
+
+	val = readl(addr);
+	if (out)
+		val |= (1 << GPIO_IO_OUT_SHIFT);
+	else
+		val &= (~(1 << GPIO_IO_OUT_SHIFT));
+
+	writel(val,addr);
+}
+
+/*******************************************************
+Function description: get GPIO IO functinality details
+Arguments :
+gpio_t gpio - Gpio number
+unsigned int *in - Value of GPIO input
+unsigned int *out - Value of GPIO output
+
+Return : None
+*******************************************************/
+
+void gpio_io_config_get(gpio_t gpio, unsigned int *in, unsigned int *out)
+{
+        unsigned int val;
+
+	if (gpio_not_valid(gpio))
+		return;
+
+	unsigned int *addr = (unsigned int *)GPIO_CONFIG_ADDR(gpio);
+
+	val = readl(addr);
+	*in = (val >> GPIO_IO_IN_SHIFT)  & GPIO_IO_IN_MASK;
+	*out = (val >> GPIO_IO_OUT_SHIFT) & GPIO_IO_OUT_MASK;
+}

src/soc/qualcomm/ipq806x/include/gpio.h

@@ -30,8 +30,10 @@
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __PLATFORM_AKRONITE_GPIO_H_
+#ifndef __SOC_QUALCOMM_IPQ806X_GPIO_H_
-#define __PLATFORM_AKRONITE_GPIO_H_
+#define __SOC_QUALCOMM_IPQ806X_GPIO_H_
+
+typedef unsigned int gpio_t;
 
 /* GPIO TLMM: Direction */
 #define GPIO_INPUT      0
@@ -57,7 +59,37 @@
 #define GPIO_ENABLE     0
 #define GPIO_DISABLE    1
 
-void gpio_tlmm_config(unsigned int gpio, unsigned int func,
+/* GPIO MAX Valid # */
-                      unsigned int dir, unsigned int pull,
+#define GPIO_MAX_NUM  68
-                      unsigned int drvstr, unsigned int enable);
+
-#endif
+/* GPIO TLMM: Mask */
+#define GPIO_CFG_PULL_MASK    0x3
+#define GPIO_CFG_FUNC_MASK    0xF
+#define GPIO_CFG_DRV_MASK     0x7
+#define GPIO_CFG_OE_MASK      0x1
+
+/* GPIO TLMM: Shift */
+#define GPIO_CFG_PULL_SHIFT   0
+#define GPIO_CFG_FUNC_SHIFT   2
+#define GPIO_CFG_DRV_SHIFT    6
+#define GPIO_CFG_OE_SHIFT     9
+
+/* GPIO IO: Mask */
+#define GPIO_IO_IN_MASK       0x1
+#define GPIO_IO_OUT_MASK      0x1
+
+/* GPIO IO: Shift */
+#define GPIO_IO_IN_SHIFT      0
+#define GPIO_IO_OUT_SHIFT     1
+
+void gpio_tlmm_config_set(gpio_t gpio, unsigned int func,
+			  unsigned int pull, unsigned int drvstr,
+			  unsigned int enable);
+
+void gpio_tlmm_config_get(gpio_t gpio, unsigned int *func,
+			  unsigned int *pull, unsigned int *drvstr,
+			  unsigned int *enable);
+
+void gpio_io_config_set(gpio_t gpio, unsigned int out);
+void gpio_io_config_get(gpio_t gpio, unsigned int *in, unsigned int *out);
+#endif // __SOC_QUALCOMM_IPQ806X_GPIO_H_

src/soc/qualcomm/ipq806x/include/iomap.h

@@ -33,10 +33,8 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _PLATFORM_MSM8960_IOMAP_H_
+#ifndef __SOC_QUALCOMM_IPQ806X_IOMAP_H_
-#define _PLATFORM_MSM8960_IOMAP_H_
+#define __SOC_QUALCOMM_IPQ806X_IOMAP_H_
-
-#include <configs/ipq806x_cdp.h>
 
 /* Typecast to allow integers being passed as address
    This needs to be included because vendor code is not compliant with our
@@ -96,4 +94,4 @@
 #define UART2_DM_BASE           0x12490000
 #define UART_GSBI2_BASE         0x12480000
 
-#endif
+#endif // __SOC_QUALCOMM_IPQ806X_IOMAP_H_