armv7: Add SPI driver for Exynos.

The SPI flash driver for Exynos chipset.

Verified to boot on snow/armv7.

Change-Id: I7eef67a9c57f825d09f13ea44c2b59b54345fa7b
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2229
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 5 insertions, 246 deletions

diff --git a/src/mainboard/google/snow/bootblock.c b/src/mainboard/google/snow/bootblock.c
index 5b3efa025c..3887e7e06d 100644
--- a/src/mainboard/google/snow/bootblock.c
+++ b/src/mainboard/google/snow/bootblock.c
@@ -17,11 +17,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#define uchar unsigned char
-#define uint  unsigned int
-
 #include <stdlib.h>
 #include <types.h>
+#include <assert.h>
+#include <arch/armv7/include/common.h>
 #include <arch/io.h>
 #include "cpu/samsung/exynos5250/clk.h"
 #include "cpu/samsung/exynos5250/cpu.h"
@@ -46,87 +45,6 @@
 /* TODO Move to Makefile.inc once we support adding bootblock stage files. */
 #include "cpu/samsung/exynos5-common/spi.c"
 
-/* FIXME(dhendrix): Can we move this SPI stuff elsewhere? */
-static void spi_rx_tx(struct exynos_spi *regs, int todo,
-			void *dinp, void const *doutp, int i)
-{
-	unsigned int *rxp = (unsigned int *)(dinp + (i * (32 * 1024)));
-	int rx_lvl, tx_lvl;
-	unsigned int out_bytes, in_bytes;
-
-	out_bytes = 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;
-		}
-	}
-}
-
-#if 0
-void clock_ll_set_pre_ratio(enum periph_id periph_id, unsigned divisor)
-{
-	struct exynos5_clock *clk =
-		(struct exynos5_clock *)samsung_get_base_clock();
-	unsigned shift;
-	unsigned mask = 0xff;
-	u32 *reg;
-
-	/*
-	 * For now we only handle a very small subset of peipherals here.
-	 * Others will need to (and do) mangle the clock registers
-	 * themselves, At some point it is hoped that this function can work
-	 * from a table or calculated register offset / mask. For now this
-	 * is at least better than spreading clock control code around
-	 * U-Boot.
-	 */
-	switch (periph_id) {
-	case PERIPH_ID_SPI0:
-		reg = &clk->div_peric1;
-		shift = 8;
-		break;
-	case PERIPH_ID_SPI1:
-		reg = &clk->div_peric1;
-		shift = 24;
-		break;
-	case PERIPH_ID_SPI2:
-		reg = &clk->div_peric2;
-		shift = 8;
-		break;
-	case PERIPH_ID_SPI3:
-		reg = &clk->sclk_div_isp;
-		shift = 4;
-		break;
-	case PERIPH_ID_SPI4:
-		reg = &clk->sclk_div_isp;
-		shift = 16;
-		break;
-	default:
-		debug("%s: Unsupported peripheral ID %d\n", __func__,
-		      periph_id);
-		return;
-	}
-}
-#endif
 void clock_ll_set_pre_ratio(enum periph_id periph_id, unsigned divisor)
 {
 	struct exynos5_clock *clk =
@@ -140,43 +58,6 @@ void clock_ll_set_pre_ratio(enum periph_id periph_id, unsigned divisor)
 	clrsetbits_le32(reg, mask << shift, (divisor & mask) << shift);
 }
 
-#if 0
-void clock_ll_set_ratio(enum periph_id periph_id, unsigned divisor)
-{
-	struct exynos5_clock *clk =
-		(struct exynos5_clock *)samsung_get_base_clock();
-	unsigned shift;
-	unsigned mask = 0xff;
-	u32 *reg;
-
-	switch (periph_id) {
-	case PERIPH_ID_SPI0:
-		reg = &clk->div_peric1;
-		shift = 0;
-		break;
-	case PERIPH_ID_SPI1:
-		reg = &clk->div_peric1;
-		shift = 16;
-		break;
-	case PERIPH_ID_SPI2:
-		reg = &clk->div_peric2;
-		shift = 0;
-		break;
-	case PERIPH_ID_SPI3:
-		reg = &clk->sclk_div_isp;
-		shift = 0;
-		break;
-	case PERIPH_ID_SPI4:
-		reg = &clk->sclk_div_isp;
-		shift = 12;
-		break;
-	default:
-		debug("%s: Unsupported peripheral ID %d\n", __func__,
-		      periph_id);
-		return;
-	}
-}
-#endif
 void clock_ll_set_ratio(enum periph_id periph_id, unsigned divisor)
 {
 	struct exynos5_clock *clk =
@@ -253,44 +134,6 @@ static int clock_calc_best_scalar(unsigned int main_scaler_bits,
 	return best_main_scalar;
 }
 
-#if 0
-int clock_set_rate(enum periph_id periph_id, unsigned int rate)
-{
-	int main;
-	unsigned int fine;
-
-	switch (periph_id) {
-	case PERIPH_ID_SPI0:
-	case PERIPH_ID_SPI1:
-	case PERIPH_ID_SPI2:
-	case PERIPH_ID_SPI3:
-	case PERIPH_ID_SPI4:
-		main = clock_calc_best_scalar(4, 8, 400000000, rate, &fine);
-		if (main < 0) {
-			debug("%s: Cannot set clock rate for periph %d",
-					__func__, periph_id);
-			return -1;
-		}
-		clock_ll_set_ratio(periph_id, main - 1);
-		clock_ll_set_pre_ratio(periph_id, fine - 1);
-		break;
-	default:
-		debug("%s: Unsupported peripheral ID %d\n", __func__,
-		      periph_id);
-		return -1;
-	}
-	main = clock_calc_best_scalar(4, 8, 400000000, rate, &fine);
-	if (main < 0) {
-		debug("%s: Cannot set clock rate for periph %d",
-				__func__, periph_id);
-		return -1;
-	}
-	clock_ll_set_ratio(PERIPH_ID_SPI1, main - 1);
-	clock_ll_set_pre_ratio(PERIPH_ID_SPI1, fine - 1);
-
-	return 0;
-}
-#endif
 int clock_set_rate(enum periph_id periph_id, unsigned int rate)
 {
 	int main;
@@ -362,77 +205,6 @@ void gpio_cfg_pin(int gpio, int cfg)
 	writel(value, &bank->con);
 }
 
-//static void exynos_spi_copy(unsigned int uboot_size)
-static void copy_romstage(uint32_t spi_addr, uint32_t sram_addr, unsigned int len)
-{
-	int upto, todo;
-	int i;
-//	struct exynos_spi *regs = (struct exynos_spi *)samsung_get_base_spi1();
-	struct exynos_spi *regs = (struct exynos_spi *)0x12d30000;
-
-	clock_set_rate(PERIPH_ID_SPI1, 50000000); /* set spi clock to 50Mhz */
-	/* set the spi1 GPIO */
-//	exynos_pinmux_config(PERIPH_ID_SPI1, PINMUX_FLAG_NONE);
-	gpio_cfg_pin(GPIO_A24, 0x2);
-	gpio_cfg_pin(GPIO_A25, 0x2);
-	gpio_cfg_pin(GPIO_A26, 0x2);
-	gpio_cfg_pin(GPIO_A27, 0x2);
-
-	/* 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_addr, &regs->tx_data);
-
-	/* waiting for TX done */
-	while (!(readl(&regs->spi_sts) & SPI_ST_TX_DONE));
-
-	for (upto = 0, i = 0; upto < len; upto += todo, i++) {
-		todo = MIN(len - upto, (1 << 15));
-		spi_rx_tx(regs, todo, (void *)(sram_addr),
-					(void *)(spi_addr), 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);
-}
-
 /* Pull mode */
 #define EXYNOS_GPIO_PULL_NONE	0x0
 #define EXYNOS_GPIO_PULL_DOWN	0x1
@@ -854,21 +626,15 @@ void do_barriers(void)
 	);
 }
 
-void sdelay(unsigned long loops);
-void sdelay(unsigned long loops)
-{
-	__asm__ volatile ("1:\n" "subs %0, %1, #1\n"
-			  "bne 1b":"=r" (loops):"0"(loops));
-}
-
 /* is this right? meh, it seems to work well enough... */
 void my_udelay(unsigned int n);
 void my_udelay(unsigned int n)
 {
-	sdelay(n * 1000);
+	n *= 1000;
+	__asm__ volatile ("1:\n" "subs %0, %1, #1\n"
+			  "bne 1b":"=r" (n):"0"(n));
 }
 
-
 void i2c_init(int speed, int slaveadd)
 {
 	struct s3c24x0_i2c_bus *i2c = &i2c0;
@@ -2145,13 +1911,6 @@ void bootblock_mainboard_init(void)
 	do_serial();
 	printk(BIOS_INFO, "%s: UART initialized\n", __func__);
 
-	/* Copy romstage data from SPI ROM to SRAM */
-	printk(BIOS_INFO, "Copying romstage:\n"
-			"\tSPI offset: 0x%06x\n"
-			"\tiRAM offset: 0x%08x\n"
-			"\tSize: 0x%x\n",
-			0, CONFIG_SPI_IMAGE_HACK, CONFIG_ROMSTAGE_SIZE);
-	copy_romstage(0x0, CONFIG_SPI_IMAGE_HACK, CONFIG_ROMSTAGE_SIZE);
 #if 0
 	/* FIXME: dump SRAM content for sanity checking */
 	uint32_t u;