From 82f70b8efdbff01a9b76e31f46300465b076f158 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <pamaury@rockbox.org>
Date: Fri, 22 Jul 2011 15:45:58 +0000
Subject: imx233/fuze+: add SD detection support

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30196 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/imx233/ssp-imx233.c | 102 +++++++++++++++++++++++++++-----
 1 file changed, 86 insertions(+), 16 deletions(-)

(limited to 'firmware/target/arm/imx233/ssp-imx233.c')

diff --git a/firmware/target/arm/imx233/ssp-imx233.c b/firmware/target/arm/imx233/ssp-imx233.c
index 59405bbdc2..c3ce8a8f58 100644
--- a/firmware/target/arm/imx233/ssp-imx233.c
+++ b/firmware/target/arm/imx233/ssp-imx233.c
@@ -44,6 +44,7 @@ static struct semaphore ssp_sema[2];
 static struct ssp_dma_command_t ssp_dma_cmd[2];
 static uint32_t ssp_bus_width[2];
 static unsigned ssp_log_block_size[2];
+static ssp_detect_cb_t ssp_detect_cb[2];
 
 void INT_SSP(int ssp)
 {
@@ -146,22 +147,7 @@ static void setup_ssp_sd_pins(int ssp)
 
     if(ssp == 1)
     {
-        /* SSP_SCK: drive 8mA */
-        imx233_set_pin_drive_strength(2, 6, PINCTRL_DRIVE_8mA);
-        /* SSP_{SCK,DATA{3,2,1,0},DETECT,CMD} */
-        imx233_set_pin_function(2, 6, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 5, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 4, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 3, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 2, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 1, PINCTRL_FUNCTION_MAIN);
-        imx233_set_pin_function(2, 0, PINCTRL_FUNCTION_MAIN);
-        /* SSP_CMD: pullup */
-        imx233_enable_pin_pullup(2, 0, true);
-        imx233_enable_pin_pullup(2, 2, true);
-        imx233_enable_pin_pullup(2, 3, true);
-        imx233_enable_pin_pullup(2, 4, true);
-        imx233_enable_pin_pullup(2, 5, true);
+        
     }
     else
     {
@@ -170,6 +156,41 @@ static void setup_ssp_sd_pins(int ssp)
 }
 #endif
 
+void imx233_ssp_setup_ssp1_sd_mmc_pins(bool enable_pullups, unsigned bus_width,
+    unsigned drive_strength, bool use_alt)
+{
+    /* SSP_{CMD,SCK} */
+    imx233_set_pin_drive_strength(2, 0, drive_strength);
+    imx233_set_pin_drive_strength(2, 6, drive_strength);
+    imx233_set_pin_function(2, 0, PINCTRL_FUNCTION_MAIN);
+    imx233_set_pin_function(2, 6, PINCTRL_FUNCTION_MAIN);
+    imx233_enable_pin_pullup(2, 0, enable_pullups);
+    /* SSP_DATA{0-3} */
+    for(unsigned i = 0; i < MIN(bus_width, 4); i++)
+    {
+        imx233_set_pin_drive_strength(2, 2 + i, drive_strength);
+        imx233_set_pin_function(2, 2 + i, PINCTRL_FUNCTION_MAIN);
+        imx233_enable_pin_pullup(2, 2 + i, enable_pullups);
+    }
+
+    /* SSP_DATA{4-7} */
+    for(unsigned i = 4; i < bus_width; i++)
+    {
+        if(use_alt)
+        {
+            imx233_set_pin_drive_strength(0, 22 + i, drive_strength);
+            imx233_set_pin_function(0, 22 + i, PINCTRL_FUNCTION_ALT2);
+            imx233_enable_pin_pullup(0, 22 + i, enable_pullups);
+        }
+        else
+        {
+            imx233_set_pin_drive_strength(0, 4 + i, drive_strength);
+            imx233_set_pin_function(0, 4 + i, PINCTRL_FUNCTION_ALT2);
+            imx233_enable_pin_pullup(0, 4 + i, enable_pullups);
+        }
+    }
+}
+
 void imx233_ssp_setup_ssp2_sd_mmc_pins(bool enable_pullups, unsigned bus_width,
     unsigned drive_strength)
 {
@@ -301,3 +322,52 @@ void imx233_ssp_sd_mmc_power_up_sequence(int ssp)
     mdelay(1);
     __REG_CLR(HW_SSP_CMD0(ssp)) = HW_SSP_CMD0__CONT_CLKING_EN;
 }
+
+static int ssp_detect_oneshot_callback(int ssp)
+{
+    printf("ssp_detect_oneshot_callback(%d)", ssp);
+    if(ssp_detect_cb[ssp - 1])
+        ssp_detect_cb[ssp - 1](ssp);
+
+    return 0;
+}
+
+static int ssp1_detect_oneshot_callback(struct timeout *tmo)
+{
+    (void) tmo;
+    return ssp_detect_oneshot_callback(1);
+}
+
+static int ssp2_detect_oneshot_callback(struct timeout *tmo)
+{
+    (void) tmo;
+    return ssp_detect_oneshot_callback(2);
+}
+
+static void detect_irq(int bank, int pin)
+{
+    static struct timeout ssp1_detect_oneshot;
+    static struct timeout ssp2_detect_oneshot;
+    if(bank == 2 && pin == 1)
+        timeout_register(&ssp1_detect_oneshot, ssp1_detect_oneshot_callback, (3*HZ/10), 0);
+    else if(bank == 0 && pin == 19)
+        timeout_register(&ssp2_detect_oneshot, ssp2_detect_oneshot_callback, (3*HZ/10), 0);
+}
+
+void imx233_ssp_sdmmc_setup_detect(int ssp, bool enable, ssp_detect_cb_t fn)
+{
+    int bank = ssp == 1 ? 2 : 0;
+    int pin = ssp == 1 ? 1 : 19;
+    ssp_detect_cb[ssp - 1] = fn;
+    if(enable)
+    {
+        imx233_set_pin_function(bank, pin, PINCTRL_FUNCTION_GPIO);
+        imx233_enable_gpio_output(bank, pin, false);
+    }
+    imx233_setup_pin_irq(bank, pin, enable, true, !imx233_ssp_sdmmc_detect(ssp), detect_irq);
+}
+
+bool imx233_ssp_sdmmc_detect(int ssp)
+{
+    return !!(HW_SSP_STATUS(ssp) & HW_SSP_STATUS__CARD_DETECT);
+}
-- 
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