PKGBUILDs/core/linux-mmp/0006-mmp-mmc-adding-sdhc-support-for-pxa168-based-gplugd.patch

From 467a8c6aba68b033b95538419e09358ce0d99694 Mon Sep 17 00:00:00 2001
From: Ashokkumar G <0xfee1dead.sa@gmail.com>
Date: Mon, 26 Jan 2015 11:40:41 -0700
Subject: [PATCH 6/8] mmp:mmc: adding sdhc support for pxa168 based gplugd

Fixing can't talk to controller for sdhci PXAV2

1. Fixing can't talk to controller for 8bus cycles at lowest speed
2. Changing clock name from PXA-SDHCLK to NULL
3. Adding MACH_GPLUGD dependency for SDHCI_PXAV2, SDHCI_IO_ACCESSORIES

Signed-off-by: Ashokkumar G <0xfee1dead.sa@gmail.com>
---
 arch/arm/mach-mmp/Kconfig               |  1 +
 arch/arm/mach-mmp/gplugd.c              |  8 ++++++++
 arch/arm/mach-mmp/include/mach/pxa168.h | 21 ++++++++++++++++++++-
 arch/arm/mach-mmp/pxa168.c              |  4 ++++
 drivers/mmc/host/Kconfig                |  4 +++-
 drivers/mmc/host/sdhci-pxav2.c          | 19 ++++++++++++++++++-
 6 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-mmp/Kconfig b/arch/arm/mach-mmp/Kconfig
index ebdba87..5843def 100644
--- a/arch/arm/mach-mmp/Kconfig
+++ b/arch/arm/mach-mmp/Kconfig
@@ -80,6 +80,7 @@ config MACH_TETON_BGA
 config MACH_GPLUGD
 	bool "Marvell's PXA168 GuruPlug Display (gplugD) Board"
 	select CPU_PXA168
+	select MMC
 	help
 	  Say 'Y' here if you want to support the Marvell PXA168-based
 	  GuruPlug Display (gplugD) Board
diff --git a/arch/arm/mach-mmp/gplugd.c b/arch/arm/mach-mmp/gplugd.c
index 2981c88..ba4ce4e 100644
--- a/arch/arm/mach-mmp/gplugd.c
+++ b/arch/arm/mach-mmp/gplugd.c
@@ -12,6 +12,7 @@
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/gpio-pxa.h>
+#include <linux/mmc/sdhci.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/pxa2xx_spi.h>
 
@@ -148,6 +149,10 @@ static struct i2c_board_info gplugd_i2c_board_info[] = {
 	}
 };
 
+struct sdhci_pxa_platdata gplugd_sdh_platdata = {
+	.quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_NO_BUSY_IRQ | SDHCI_QUIRK_32BIT_DMA_SIZE,
+};
+
 static void __init select_disp_freq(void)
 {
 	/* set GPIO 35 & clear GPIO 85 to set LCD External Clock to 74.25 MHz */
@@ -332,6 +337,9 @@ static void __init gplugd_init(void)
 
 	pxa168_add_ssp(2);
 
+	pxa168_add_sdh(1, &gplugd_sdh_platdata);
+	pxa168_add_sdh(2, &gplugd_sdh_platdata);
+
 	pxa168_add_eth(&gplugd_eth_platform_data);
 }
 
diff --git a/arch/arm/mach-mmp/include/mach/pxa168.h b/arch/arm/mach-mmp/include/mach/pxa168.h
index a83ba7c..def8f46 100644
--- a/arch/arm/mach-mmp/include/mach/pxa168.h
+++ b/arch/arm/mach-mmp/include/mach/pxa168.h
@@ -17,6 +17,7 @@ extern void pxa168_clear_keypad_wakeup(void);
 #include <linux/platform_data/keypad-pxa27x.h>
 #include <mach/cputype.h>
 #include <linux/pxa168_eth.h>
+#include <linux/platform_data/pxa_sdhci.h>
 #include <linux/platform_data/mv_usb.h>
 
 extern struct pxa_device_desc pxa168_device_uart1;
@@ -37,7 +38,10 @@ extern struct pxa_device_desc pxa168_device_nand;
 extern struct pxa_device_desc pxa168_device_fb;
 extern struct pxa_device_desc pxa168_device_keypad;
 extern struct pxa_device_desc pxa168_device_eth;
-
+extern struct pxa_device_desc pxa168_device_sdh1;
+extern struct pxa_device_desc pxa168_device_sdh2;
+extern struct pxa_device_desc pxa168_device_sdh3;
+extern struct pxa_device_desc pxa168_device_sdh4;
 /* pdata can be NULL */
 extern int __init pxa168_add_usb_host(struct mv_usb_platform_data *pdata);
 
@@ -134,4 +138,19 @@ static inline int pxa168_add_eth(struct pxa168_eth_platform_data *data)
 {
 	return pxa_register_device(&pxa168_device_eth, data, sizeof(*data));
 }
+
+static inline int pxa168_add_sdh(int id, struct sdhci_pxa_platdata *data)
+{
+	struct pxa_device_desc *d = NULL;
+
+	switch (id) {
+	case 1: d = &pxa168_device_sdh1; break;
+	case 2: d = &pxa168_device_sdh2; break;
+	case 3: d = &pxa168_device_sdh3; break;
+	case 4: d = &pxa168_device_sdh4; break;
+	default:
+		return -EINVAL;
+	}
+	return pxa_register_device(d, data, sizeof(*data));
+}
 #endif /* __ASM_MACH_PXA168_H */
diff --git a/arch/arm/mach-mmp/pxa168.c b/arch/arm/mach-mmp/pxa168.c
index 144e997..e7dee43 100644
--- a/arch/arm/mach-mmp/pxa168.c
+++ b/arch/arm/mach-mmp/pxa168.c
@@ -110,6 +110,10 @@ PXA168_DEVICE(ssp5, "pxa168-ssp", 4, SSP5, 0xd4021000, 0x40, 60, 61);
 PXA168_DEVICE(fb, "pxa168-fb", -1, LCD, 0xd420b000, 0x1c8);
 PXA168_DEVICE(keypad, "pxa27x-keypad", -1, KEYPAD, 0xd4012000, 0x4c);
 PXA168_DEVICE(eth, "pxa168-eth", -1, MFU, 0xc0800000, 0x0fff);
+PXA168_DEVICE(sdh1, "sdhci-pxav2", 0, SDH1, 0xd4280000, 0x100);
+PXA168_DEVICE(sdh2, "sdhci-pxav2", 1, SDH1, 0xd4281000, 0x100);
+PXA168_DEVICE(sdh3, "sdhci-pxav2", 2, SDH2, 0xd427e000, 0x100);
+PXA168_DEVICE(sdh4, "sdhci-pxav2", 3, SDH2, 0xd427f000, 0x100);
 
 struct resource pxa168_resource_gpio[] = {
 	{
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 1386065..02f8e4d 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -240,7 +240,9 @@ config MMC_SDHCI_PXAV2
 	tristate "Marvell PXA9XX SD Host Controller support (PXAV2)"
 	depends on CLKDEV_LOOKUP
 	depends on MMC_SDHCI_PLTFM
-	default CPU_PXA910
+	select MMC_SDHCI_IO_ACCESSORS if MACH_GPLUGD
+	default y if (CPU_PXA910 || MACH_GPLUGD)
+
 	help
 	  This selects the Marvell(R) PXAV2 SD Host Controller.
 	  If you have a PXA9XX platform with SD Host Controller
diff --git a/drivers/mmc/host/sdhci-pxav2.c b/drivers/mmc/host/sdhci-pxav2.c
index b4c23e9..f0f36c9 100644
--- a/drivers/mmc/host/sdhci-pxav2.c
+++ b/drivers/mmc/host/sdhci-pxav2.c
@@ -111,7 +111,24 @@ static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width)
 	writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 }
 
+/*
+ * we cannot talk to controller for 8 bus cycles according to sdio spec
+ * at lowest speed this is 100,000 HZ per cycle or 800,000 cycles
+ * which is quite a LONG TIME on a fast cpu -- so delay if needed
+ */
+static inline u16 pxa168_readw(struct sdhci_host *host, int reg)
+{
+	u32 temp;
+	if (reg == SDHCI_HOST_VERSION) {
+		temp = readl (host->ioaddr + SDHCI_HOST_VERSION - 2) >> 16;
+		return temp & 0xffff;
+	}
+
+	return readw(host->ioaddr + reg);
+}
+
 static const struct sdhci_ops pxav2_sdhci_ops = {
+	.read_w = &pxa168_readw,
 	.set_clock     = sdhci_set_clock,
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_bus_width = pxav2_mmc_set_bus_width,
@@ -185,7 +202,7 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 	pltfm_host = sdhci_priv(host);
 	pltfm_host->priv = pxa;
 
-	clk = clk_get(dev, "PXA-SDHCLK");
+	clk = clk_get(dev, "NULL");
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get io clock\n");
 		ret = PTR_ERR(clk);
-- 
2.8.0