[U-Boot] [PATCH V3] exynos: spl: Add a custom spi copy function

Rajeshwari S Shinde rajeshwari.s at samsung.com
Tue Oct 8 15:12:22 CEST 2013 

This patch implements a custom spi_copy funtion to copy u-boot from SF
to RAM. This is faster then iROM spi_copy funtion as this runs spi at
50Mhz and also in WORD mode of operation.

Changed a printf in pinmux.c to debug just to avoid the compilation
error in SPL.

Signed-off-by: Alim Akhtar <alim.akhtar at samsung.com>
Signed-off-by: Tom Wai-Hong Tam <waihong at chromium.org>
Signed-off-by: Rajeshwari S Shinde <rajeshwari.s at samsung.com>
---
Based on following patch yet to be merged:
	"[U-Boot] [PATCH 4/4] spi: exynos: Support word transfers"
Changes in V2:
	- Corrected the commit message.
	- Added a SPI timeout check.
	- Corrected the comments.
Changes in V3:
	- Rebased on the latest u-boot-spi tree.
 arch/arm/cpu/armv7/exynos/pinmux.c     |   2 +-
 arch/arm/cpu/armv7/exynos/spl_boot.c   | 122 ++++++++++++++++++++++++++++++++-
 arch/arm/include/asm/arch-exynos/spi.h |   1 +
 include/configs/exynos5250-dt.h        |   2 +
 4 files changed, 123 insertions(+), 4 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/pinmux.c b/arch/arm/cpu/armv7/exynos/pinmux.c
index 8002bce..74cc700 100644
--- a/arch/arm/cpu/armv7/exynos/pinmux.c
+++ b/arch/arm/cpu/armv7/exynos/pinmux.c
@@ -462,7 +462,7 @@ static int exynos4_pinmux_config(int peripheral, int flags)
 	case PERIPH_ID_SDMMC1:
 	case PERIPH_ID_SDMMC3:
 	case PERIPH_ID_SDMMC4:
-		printf("SDMMC device %d not implemented\n", peripheral);
+		debug("SDMMC device %d not implemented\n", peripheral);
 		return -1;
 	default:
 		debug("%s: invalid peripheral %d", __func__, peripheral);
diff --git a/arch/arm/cpu/armv7/exynos/spl_boot.c b/arch/arm/cpu/armv7/exynos/spl_boot.c
index 3651c00..6faf13f 100644
--- a/arch/arm/cpu/armv7/exynos/spl_boot.c
+++ b/arch/arm/cpu/armv7/exynos/spl_boot.c
@@ -10,8 +10,11 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/dmc.h>
+#include <asm/arch/periph.h>
+#include <asm/arch/pinmux.h>
 #include <asm/arch/power.h>
 #include <asm/arch/spl.h>
+#include <asm/arch/spi.h>
 
 #include "common_setup.h"
 #include "clock_init.h"
@@ -59,6 +62,119 @@ static int config_branch_prediction(int set_cr_z)
 }
 #endif
 
+static void spi_rx_tx(struct exynos_spi *regs, int todo,
+			void *dinp, void const *doutp, int i)
+{
+	uint *rxp = (uint *)(dinp + (i * (32 * 1024)));
+	int rx_lvl, tx_lvl;
+	uint out_bytes, in_bytes;
+
+	out_bytes = todo;
+	in_bytes = todo;
+	setbits_le32(&regs->ch_cfg, SPI_CH_RST);
+	clrbits_le32(&regs->ch_cfg, SPI_CH_RST);
+	writel(((todo * 8) / 32) | SPI_PACKET_CNT_EN, &regs->pkt_cnt);
+
+	while (in_bytes) {
+		uint32_t spi_sts;
+		int temp;
+
+		spi_sts = readl(&regs->spi_sts);
+		rx_lvl = ((spi_sts >> 15) & 0x7f);
+		tx_lvl = ((spi_sts >> 6) & 0x7f);
+		while (tx_lvl < 32 && out_bytes) {
+			temp = 0xffffffff;
+			writel(temp, &regs->tx_data);
+			out_bytes -= 4;
+			tx_lvl += 4;
+		}
+		while (rx_lvl >= 4 && in_bytes) {
+			temp = readl(&regs->rx_data);
+			if (rxp)
+				*rxp++ = temp;
+			in_bytes -= 4;
+			rx_lvl -= 4;
+		}
+	}
+}
+
+/*
+ * Copy uboot from spi flash to RAM
+ *
+ * @parma uboot_size	size of u-boot to copy
+ * @param uboot_addr	address in u-boot to copy
+ */
+static void exynos_spi_copy(unsigned int uboot_size, unsigned int uboot_addr)
+{
+	int upto, todo;
+	int i, timeout = 100;
+	struct exynos_spi *regs = (struct exynos_spi *)CONFIG_ENV_SPI_BASE;
+
+	set_spi_clk(PERIPH_ID_SPI1, 50000000); /* set spi clock to 50Mhz */
+	/* set the spi1 GPIO */
+	exynos_pinmux_config(PERIPH_ID_SPI1, PINMUX_FLAG_NONE);
+
+	/* set pktcnt and enable it */
+	writel(4 | SPI_PACKET_CNT_EN, &regs->pkt_cnt);
+	/* set FB_CLK_SEL */
+	writel(SPI_FB_DELAY_180, &regs->fb_clk);
+	/* set CH_WIDTH and BUS_WIDTH as word */
+	setbits_le32(&regs->mode_cfg, SPI_MODE_CH_WIDTH_WORD |
+					SPI_MODE_BUS_WIDTH_WORD);
+	clrbits_le32(&regs->ch_cfg, SPI_CH_CPOL_L); /* CPOL: active high */
+
+	/* clear rx and tx channel if set priveously */
+	clrbits_le32(&regs->ch_cfg, SPI_RX_CH_ON | SPI_TX_CH_ON);
+
+	setbits_le32(&regs->swap_cfg, SPI_RX_SWAP_EN |
+			SPI_RX_BYTE_SWAP |
+			SPI_RX_HWORD_SWAP);
+
+	/* do a soft reset */
+	setbits_le32(&regs->ch_cfg, SPI_CH_RST);
+	clrbits_le32(&regs->ch_cfg, SPI_CH_RST);
+
+	/* now set rx and tx channel ON */
+	setbits_le32(&regs->ch_cfg, SPI_RX_CH_ON | SPI_TX_CH_ON | SPI_CH_HS_EN);
+	clrbits_le32(&regs->cs_reg, SPI_SLAVE_SIG_INACT); /* CS low */
+
+	/* Send read instruction (0x3h) followed by a 24 bit addr */
+	writel((SF_READ_DATA_CMD << 24) | SPI_FLASH_UBOOT_POS, &regs->tx_data);
+
+	/* waiting for TX done */
+	while (!(readl(&regs->spi_sts) & SPI_ST_TX_DONE)) {
+		if (!timeout) {
+			debug("SPI TIMEOUT\n");
+			break;
+		}
+		timeout--;
+	}
+
+	for (upto = 0, i = 0; upto < uboot_size; upto += todo, i++) {
+		todo = min(uboot_size - upto, (1 << 15));
+		spi_rx_tx(regs, todo, (void *)(uboot_addr),
+			  (void *)(SPI_FLASH_UBOOT_POS), i);
+	}
+
+	setbits_le32(&regs->cs_reg, SPI_SLAVE_SIG_INACT);/* make the CS high */
+
+	/*
+	 * Let put controller mode to BYTE as
+	 * SPI driver does not support WORD mode yet
+	 */
+	clrbits_le32(&regs->mode_cfg, SPI_MODE_CH_WIDTH_WORD |
+					SPI_MODE_BUS_WIDTH_WORD);
+	writel(0, &regs->swap_cfg);
+
+	/*
+	 * Flush spi tx, rx fifos and reset the SPI controller
+	 * and clear rx/tx channel
+	 */
+	clrsetbits_le32(&regs->ch_cfg, SPI_CH_HS_EN, SPI_CH_RST);
+	clrbits_le32(&regs->ch_cfg, SPI_CH_RST);
+	clrbits_le32(&regs->ch_cfg, SPI_TX_CH_ON | SPI_RX_CH_ON);
+}
+
 /*
 * Copy U-boot from mmc to RAM:
 * COPY_BL2_FNPTR_ADDR: Address in iRAM, which Contains
@@ -70,6 +186,7 @@ void copy_uboot_to_ram(void)
 
 	u32 (*copy_bl2)(u32 offset, u32 nblock, u32 dst) = NULL;
 	u32 offset = 0, size = 0;
+	struct spl_machine_param *param = spl_get_machine_params();
 #ifdef CONFIG_SUPPORT_EMMC_BOOT
 	u32 (*copy_bl2_from_emmc)(u32 nblock, u32 dst);
 	void (*end_bootop_from_emmc)(void);
@@ -91,9 +208,8 @@ void copy_uboot_to_ram(void)
 	switch (bootmode) {
 #ifdef CONFIG_SPI_BOOTING
 	case BOOT_MODE_SERIAL:
-		offset = SPI_FLASH_UBOOT_POS;
-		size = CONFIG_BL2_SIZE;
-		copy_bl2 = get_irom_func(SPI_INDEX);
+		/* Customised function to copy u-boot from SF */
+		exynos_spi_copy(param->uboot_size, CONFIG_SYS_TEXT_BASE);
 		break;
 #endif
 	case BOOT_MODE_MMC:
diff --git a/arch/arm/include/asm/arch-exynos/spi.h b/arch/arm/include/asm/arch-exynos/spi.h
index 147c1a7..0ba931b 100644
--- a/arch/arm/include/asm/arch-exynos/spi.h
+++ b/arch/arm/include/asm/arch-exynos/spi.h
@@ -30,6 +30,7 @@ struct exynos_spi {
 #define EXYNOS_SPI_MAX_FREQ	50000000
 
 #define SPI_TIMEOUT_MS		10
+#define SF_READ_DATA_CMD	0x3
 
 /* SPI_CHCFG */
 #define SPI_CH_HS_EN		(1 << 6)
diff --git a/include/configs/exynos5250-dt.h b/include/configs/exynos5250-dt.h
index 8c21909..1d32396 100644
--- a/include/configs/exynos5250-dt.h
+++ b/include/configs/exynos5250-dt.h
@@ -154,6 +154,7 @@
 #define COPY_BL2_FNPTR_ADDR	0x02020030
 
 #define CONFIG_SPL_LIBCOMMON_SUPPORT
+#define CONFIG_SPL_GPIO_SUPPORT
 
 /* specific .lds file */
 #define CONFIG_SPL_LDSCRIPT	"board/samsung/common/exynos-uboot-spl.lds"
@@ -292,6 +293,7 @@
 /* SPI */
 #define CONFIG_ENV_IS_IN_SPI_FLASH
 #define CONFIG_SPI_FLASH
+#define CONFIG_ENV_SPI_BASE	0x12D30000
 
 #ifdef CONFIG_SPI_FLASH
 #define CONFIG_EXYNOS_SPI
-- 
1.7.12.4

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