mmc: Tegra2: SD/MMC driver for Seaboard - eMMC on SDMMC4, SDIO on SDMMC3

Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Andy Fleming <afleming@freescale.com>

2 files changed, 148 insertions, 0 deletions

diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index 3d6c248..627e061 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -32,6 +32,10 @@
 #include <asm/arch/uart.h>
 #include "board.h"
 
+#ifdef CONFIG_TEGRA2_MMC
+#include <mmc.h>
+#endif
+
 DECLARE_GLOBAL_DATA_PTR;
 
 const struct tegra2_sysinfo sysinfo = {
@@ -171,6 +175,116 @@ static void pin_mux_uart(void)
 }
 
 /*
+ * Routine: clock_init_mmc
+ * Description: init the PLL and clocks for the SDMMC controllers
+ */
+static void clock_init_mmc(void)
+{
+	struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
+	u32 reg;
+
+	/* Do the SDMMC resets/clock enables */
+
+	/* Assert Reset to SDMMC4 */
+	reg = readl(&clkrst->crc_rst_dev_l);
+	reg |= SWR_SDMMC4_RST;		/* SWR_SDMMC4_RST = 1 */
+	writel(reg, &clkrst->crc_rst_dev_l);
+
+	/* Enable clk to SDMMC4 */
+	reg = readl(&clkrst->crc_clk_out_enb_l);
+	reg |= CLK_ENB_SDMMC4;		/* CLK_ENB_SDMMC4 = 1 */
+	writel(reg, &clkrst->crc_clk_out_enb_l);
+
+	/* Enable pllp_out0 to SDMMC4 */
+	reg = readl(&clkrst->crc_clk_src_sdmmc4);
+	reg &= 0x3FFFFF00;	/* SDMMC4_CLK_SRC = 00, PLLP_OUT0 */
+	reg |= (10 << 1);	/* n-1, 11-1 shl 1 */
+	writel(reg, &clkrst->crc_clk_src_sdmmc4);
+
+	/*
+	 * As per the Tegra2 TRM, section 5.3.4:
+	 * 'Wait 2 us for the clock to flush through the pipe/logic'
+	 */
+	udelay(2);
+
+	/* De-assert reset to SDMMC4 */
+	reg = readl(&clkrst->crc_rst_dev_l);
+	reg &= ~SWR_SDMMC4_RST;		/* SWR_SDMMC4_RST = 0 */
+	writel(reg, &clkrst->crc_rst_dev_l);
+
+	/* Assert Reset to SDMMC3 */
+	reg = readl(&clkrst->crc_rst_dev_u);
+	reg |= SWR_SDMMC3_RST;		/* SWR_SDMMC3_RST = 1 */
+	writel(reg, &clkrst->crc_rst_dev_u);
+
+	/* Enable clk to SDMMC3 */
+	reg = readl(&clkrst->crc_clk_out_enb_u);
+	reg |= CLK_ENB_SDMMC3;		/* CLK_ENB_SDMMC3 = 1 */
+	writel(reg, &clkrst->crc_clk_out_enb_u);
+
+	/* Enable pllp_out0 to SDMMC4, set divisor to 11 for 20MHz */
+	reg = readl(&clkrst->crc_clk_src_sdmmc3);
+	reg &= 0x3FFFFF00;	/* SDMMC3_CLK_SRC = 00, PLLP_OUT0 */
+	reg |= (10 << 1);	/* n-1, 11-1 shl 1 */
+	writel(reg, &clkrst->crc_clk_src_sdmmc3);
+
+	/* wait for 2us */
+	udelay(2);
+
+	/* De-assert reset to SDMMC3 */
+	reg = readl(&clkrst->crc_rst_dev_u);
+	reg &= ~SWR_SDMMC3_RST;		/* SWR_SDMMC3_RST = 0 */
+	writel(reg, &clkrst->crc_rst_dev_u);
+}
+
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the pin muxes/tristate values for the SDMMC(s)
+ */
+static void pin_mux_mmc(void)
+{
+	struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
+	u32 reg;
+
+	/* SDMMC4 */
+	/* config 2, x8 on 2nd set of pins */
+	reg = readl(&pmt->pmt_ctl_a);
+	reg |= (3 << 16);	/* ATB_SEL [17:16] = 11 SDIO4 */
+	writel(reg, &pmt->pmt_ctl_a);
+	reg = readl(&pmt->pmt_ctl_b);
+	reg |= (3 << 0);	/* GMA_SEL [1:0] = 11 SDIO4 */
+	writel(reg, &pmt->pmt_ctl_b);
+	reg = readl(&pmt->pmt_ctl_d);
+	reg |= (3 << 0);	/* GME_SEL [1:0] = 11 SDIO4 */
+	writel(reg, &pmt->pmt_ctl_d);
+
+	reg = readl(&pmt->pmt_tri_a);
+	reg &= ~Z_ATB;		/* Z_ATB = normal (0) */
+	reg &= ~Z_GMA;		/* Z_GMA = normal (0) */
+	writel(reg, &pmt->pmt_tri_a);
+	reg = readl(&pmt->pmt_tri_b);
+	reg &= ~Z_GME;		/* Z_GME = normal (0) */
+	writel(reg, &pmt->pmt_tri_b);
+
+	/* SDMMC3 */
+	/* SDIO3_CLK, SDIO3_CMD, SDIO3_DAT[3:0] */
+	reg = readl(&pmt->pmt_ctl_d);
+	reg &= 0xFFFF03FF;
+	reg |= (2 << 10);	/* SDB_SEL [11:10] = 01 SDIO3 */
+	reg |= (2 << 12);	/* SDC_SEL [13:12] = 01 SDIO3 */
+	reg |= (2 << 14);	/* SDD_SEL [15:14] = 01 SDIO3 */
+	writel(reg, &pmt->pmt_ctl_d);
+
+	reg = readl(&pmt->pmt_tri_b);
+	reg &= ~Z_SDC;		/* Z_SDC = normal (0) */
+	reg &= ~Z_SDD;		/* Z_SDD = normal (0) */
+	writel(reg, &pmt->pmt_tri_b);
+	reg = readl(&pmt->pmt_tri_d);
+	reg &= ~Z_SDB;		/* Z_SDB = normal (0) */
+	writel(reg, &pmt->pmt_tri_d);
+}
+
+/*
  * Routine: clock_init
  * Description: Do individual peripheral clock reset/enables
  */
@@ -210,3 +324,36 @@ int board_init(void)
 
 	return 0;
 }
+
+#ifdef CONFIG_TEGRA2_MMC
+/* this is a weak define that we are overriding */
+int board_mmc_init(bd_t *bd)
+{
+	debug("board_mmc_init called\n");
+	/* Enable clocks, muxes, etc. for SDMMC controllers */
+	clock_init_mmc();
+	pin_mux_mmc();
+
+	debug("board_mmc_init: init eMMC\n");
+	/* init dev 0, eMMC chip, with 4-bit bus */
+	tegra2_mmc_init(0, 4);
+
+	debug("board_mmc_init: init SD slot\n");
+	/* init dev 1, SD slot, with 4-bit bus */
+	tegra2_mmc_init(1, 4);
+
+	return 0;
+}
+
+/* this is a weak define that we are overriding */
+int board_mmc_getcd(u8 *cd, struct mmc *mmc)
+{
+	debug("board_mmc_getcd called\n");
+	/*
+	 * Hard-code CD presence for now. Need to add GPIO inputs
+	 * for Seaboard & Harmony (& Kaen/Aebl/Wario?)
+	 */
+	*cd = 1;
+	return 0;
+}
+#endif
diff --git a/board/nvidia/common/board.h b/board/nvidia/common/board.h
index 350bc57..4334c02 100644
--- a/board/nvidia/common/board.h
+++ b/board/nvidia/common/board.h
@@ -29,5 +29,6 @@ void clock_init(void);
 void pinmux_init(void);
 void gpio_init(void);
 void gpio_config_uart(void);
+int tegra2_mmc_init(int dev_index, int bus_width);
 
 #endif	/* BOARD_H */