ipq806x: add LPASS clock control driver

Add a clock control driver to initialize the clock tree inside the
low-power audio subsystem. Depthcharge builds up on this to enable
audio function on storm.

The clock is hardcoded for 48KHz frame rate, two 16 bit channels.

BRANCH=storm
BUG=chrome-os-partner:35247

TEST=with depthcharge patches applied and Using depthcharge CLI audio
     test program verified that the target generates sensible sounds

     audio 100 100
     audio 1000 5000

Change-Id: I56513fc782657ade99b6e43b2d5d3141d27ecc4e
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 0d4f408408aa38b2f0ee19b83ed490de39074760
Original-Change-Id: If8ffc326698fcea17e05d536930d927ca553481f
Original-Signed-off-by: Kenneth Westfield <kwestfie@codeaurora.org>
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/248830
Original-Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: http://review.coreboot.org/9758
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 316 insertions, 0 deletions

diff --git a/src/soc/qualcomm/ipq806x/lcc.c b/src/soc/qualcomm/ipq806x/lcc.c
new file mode 100644
index 0000000000..978526d8e7
--- /dev/null
+++ b/src/soc/qualcomm/ipq806x/lcc.c
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <delay.h>
+#include <console/console.h>
+#include <soc/clock.h>
+#include <soc/lcc-reg.h>
+#include <arch/io.h>
+
+typedef struct {
+	void *gcc_apcs_regs;
+	void *lcc_pll0_regs;
+	void *lcc_ahbix_regs;
+	void *lcc_mi2s_regs;
+	void *lcc_pll_regs;
+} Ipq806xLccClocks;
+
+typedef struct __attribute__((packed)) {
+	uint32_t apcs;
+} Ipq806xLccGccRegs;
+
+typedef struct __attribute__((packed)) {
+	uint32_t mode;
+	uint32_t l_val;
+	uint32_t m_val;
+	uint32_t n_val;
+	uint32_t UNUSED;
+	uint32_t config;
+	uint32_t status;
+} Ipq806xLccPll0Regs;
+
+typedef struct __attribute__((packed)) {
+	uint32_t ns;
+	uint32_t md;
+	uint32_t UNUSED;
+	uint32_t status;
+} Ipq806xLccAhbixRegs;
+
+typedef struct __attribute__((packed)) {
+	uint32_t ns;
+	uint32_t md;
+	uint32_t status;
+} Ipq806xLccMi2sRegs;
+
+typedef struct __attribute__((packed)) {
+	uint32_t pri;
+	uint32_t sec;
+} Ipq806xLccPllRegs;
+
+struct lcc_freq_tbl {
+	unsigned freq;
+	unsigned pd;
+	unsigned m;
+	unsigned n;
+	unsigned d;
+};
+
+static const struct lcc_freq_tbl lcc_mi2s_freq_tbl[] = {
+	{  1024000, 4,  1,  96, 8 },
+	{  1411200, 4,  2, 139, 8 },
+	{  1536000, 4,  1,  64, 8 },
+	{  2048000, 4,  1,  48, 8 },
+	{  2116800, 4,  2,  93, 8 },
+	{  2304000, 4,  2,  85, 8 },
+	{  2822400, 4,  6, 209, 8 },
+	{  3072000, 4,  1,  32, 8 },
+	{  3175200, 4,  1,  31, 8 },
+	{  4096000, 4,  1,  24, 8 },
+	{  4233600, 4,  9, 209, 8 },
+	{  4608000, 4,  3,  64, 8 },
+	{  5644800, 4, 12, 209, 8 },
+	{  6144000, 4,  1,  16, 8 },
+	{  6350400, 4,  2,  31, 8 },
+	{  8192000, 4,  1,  12, 8 },
+	{  8467200, 4, 18, 209, 8 },
+	{  9216000, 4,  3,  32, 8 },
+	{ 11289600, 4, 24, 209, 8 },
+	{ 12288000, 4,  1,   8, 8 },
+	{ 12700800, 4, 27, 209, 8 },
+	{ 13824000, 4,  9,  64, 8 },
+	{ 16384000, 4,  1,   6, 8 },
+	{ 16934400, 4, 41, 238, 8 },
+	{ 18432000, 4,  3,  16, 8 },
+	{ 22579200, 2, 24, 209, 8 },
+	{ 24576000, 4,  1,   4, 8 },
+	{ 27648000, 4,  9,  32, 8 },
+	{ 33868800, 4, 41, 119, 8 },
+	{ 36864000, 4,  3,   8, 8 },
+	{ 45158400, 1, 24, 209, 8 },
+	{ 49152000, 4,  1,   2, 8 },
+	{ 50803200, 1, 27, 209, 8 },
+	{ }
+};
+
+static int lcc_init_enable_pll0(Ipq806xLccClocks *bus)
+{
+	Ipq806xLccGccRegs *gcc_regs = bus->gcc_apcs_regs;
+	Ipq806xLccPll0Regs *pll0_regs = bus->lcc_pll0_regs;
+	Ipq806xLccPllRegs *pll_regs = bus->lcc_pll_regs;
+	uint32_t regval;
+
+	regval = 0;
+	regval = 15 << LCC_PLL0_L_SHIFT & LCC_PLL0_L_MASK;
+	writel(regval, &pll0_regs->l_val);
+
+	regval = 0;
+	regval = 145 << LCC_PLL0_M_SHIFT & LCC_PLL0_M_MASK;
+	writel(regval, &pll0_regs->m_val);
+
+	regval = 0;
+	regval = 199 << LCC_PLL0_N_SHIFT & LCC_PLL0_N_MASK;
+	writel(regval, &pll0_regs->n_val);
+
+	regval = 0;
+	regval |= LCC_PLL0_CFG_LV_MAIN_ENABLE;
+	regval |= LCC_PLL0_CFG_FRAC_ENABLE;
+	writel(regval, &pll0_regs->config);
+
+	regval = 0;
+	regval |= LCC_PLL_PCLK_SRC_PRI;
+	writel(regval, &pll_regs->pri);
+
+	regval = 0;
+	regval |= 1 << LCC_PLL0_MODE_BIAS_CNT_SHIFT &
+			LCC_PLL0_MODE_BIAS_CNT_MASK;
+	regval |= 8 << LCC_PLL0_MODE_LOCK_CNT_SHIFT &
+			LCC_PLL0_MODE_LOCK_CNT_MASK;
+	writel(regval, &pll0_regs->mode);
+
+	regval = readl(&gcc_regs->apcs);
+	regval |= GCC_PLL_APCS_PLL4_ENABLE;
+	writel(regval, &gcc_regs->apcs);
+
+	regval = readl(&pll0_regs->mode);
+	regval |= LCC_PLL0_MODE_FSM_VOTE_ENABLE;
+	writel(regval, &pll0_regs->mode);
+
+	mdelay(1);
+
+	regval = readl(&pll0_regs->status);
+	if (regval & LCC_PLL0_STAT_ACTIVE_MASK)
+		return 0;
+
+	printk(BIOS_ERR, "%s: error enabling PLL4 clock\n", __func__);
+	return 1;
+}
+
+static int lcc_init_enable_ahbix(Ipq806xLccClocks *bus)
+{
+	Ipq806xLccAhbixRegs *ahbix_regs = bus->lcc_ahbix_regs;
+	uint32_t regval;
+
+	regval = 0;
+	regval |= 1 << LCC_AHBIX_MD_M_VAL_SHIFT & LCC_AHBIX_MD_M_VAL_MASK;
+	regval |= 252 << LCC_AHBIX_MD_NOT_2D_VAL_SHIFT &
+			LCC_AHBIX_MD_NOT_2D_VAL_MASK;
+	writel(regval, &ahbix_regs->md);
+
+	regval = 0;
+	regval |= 253 << LCC_AHBIX_NS_N_VAL_SHIFT & LCC_AHBIX_NS_N_VAL_MASK;
+	regval |= LCC_AHBIX_NS_CRC_ENABLE;
+	regval |= LCC_AHBIX_NS_GFM_SEL_MNC;
+	regval |= LCC_AHBIX_NS_MNC_CLK_ENABLE;
+	regval |= LCC_AHBIX_NS_MNC_ENABLE;
+	regval |= LCC_AHBIX_NS_MNC_MODE_DUAL;
+	regval |= LCC_AHBIX_NS_PREDIV_BYPASS;
+	regval |= LCC_AHBIX_NS_MN_SRC_LPA;
+	writel(regval, &ahbix_regs->ns);
+
+	mdelay(1);
+
+	regval = readl(&ahbix_regs->status);
+	if (regval & LCC_AHBIX_STAT_AIF_CLK_MASK)
+		return 0;
+
+	printk(BIOS_ERR, "%s: error enabling AHBIX clock\n", __func__);
+	return 1;
+}
+
+static int lcc_init_mi2s(Ipq806xLccClocks *bus, unsigned freq)
+{
+	Ipq806xLccMi2sRegs *mi2s_regs = bus->lcc_mi2s_regs;
+	uint32_t regval;
+	uint8_t pd, m, n, d;
+	unsigned i;
+
+	i = 0;
+	while (lcc_mi2s_freq_tbl[i].freq != 0) {
+		if (lcc_mi2s_freq_tbl[i].freq == freq)
+			break;
+		++i;
+	}
+	if (lcc_mi2s_freq_tbl[i].freq == 0) {
+		printk(BIOS_ERR, "%s: invalid frequency given: %u\n",
+		       __func__, freq);
+		return 1;
+	}
+
+	switch (lcc_mi2s_freq_tbl[i].pd) {
+	case 1:
+		pd = LCC_MI2S_NS_PREDIV_BYPASS;
+		break;
+	case 2:
+		pd = LCC_MI2S_NS_PREDIV_DIV2;
+		break;
+	case 4:
+		pd = LCC_MI2S_NS_PREDIV_DIV4;
+		break;
+	default:
+		printk(BIOS_ERR, "%s: invalid prediv found: %u\n", __func__,
+				lcc_mi2s_freq_tbl[i].pd);
+		return 1;
+	}
+
+	m = lcc_mi2s_freq_tbl[i].m;
+	n = ~(lcc_mi2s_freq_tbl[i].n - m);
+	d = ~(lcc_mi2s_freq_tbl[i].d * 2);
+
+	regval = 0;
+	regval |= m << LCC_MI2S_MD_M_VAL_SHIFT & LCC_MI2S_MD_M_VAL_MASK;
+	regval |= d << LCC_MI2S_MD_NOT_2D_VAL_SHIFT &
+			LCC_MI2S_MD_NOT_2D_VAL_MASK;
+	writel(regval, &mi2s_regs->md);
+
+	regval = 0;
+	regval |= n << LCC_MI2S_NS_N_VAL_SHIFT & LCC_MI2S_NS_N_VAL_MASK;
+	regval |= LCC_MI2S_NS_BIT_DIV_DIV4;
+	regval |= LCC_MI2S_NS_MNC_CLK_ENABLE;
+	regval |= LCC_MI2S_NS_MNC_ENABLE;
+	regval |= LCC_MI2S_NS_MNC_MODE_DUAL;
+	regval |= pd;
+	regval |= LCC_MI2S_NS_MN_SRC_LPA;
+	writel(regval, &mi2s_regs->ns);
+
+	return 0;
+}
+
+static int lcc_enable_mi2s(Ipq806xLccClocks *bus)
+{
+	Ipq806xLccMi2sRegs *mi2s_regs = bus->lcc_mi2s_regs;
+	uint32_t regval;
+
+	regval = readl(&mi2s_regs->ns);
+	regval |= LCC_MI2S_NS_OSR_CXC_ENABLE;
+	regval |= LCC_MI2S_NS_BIT_CXC_ENABLE;
+	writel(regval, &mi2s_regs->ns);
+
+	udelay(10);
+
+	regval = readl(&mi2s_regs->status);
+	if (regval & LCC_MI2S_STAT_OSR_CLK_MASK)
+		if (regval & LCC_MI2S_STAT_BIT_CLK_MASK)
+			return 0;
+
+	printk(BIOS_ERR, "%s: error enabling MI2S clocks: %u\n",
+	       __func__, regval);
+	return 1;
+}
+
+int audio_clock_config(unsigned frequency)
+{
+	Ipq806xLccClocks *bus = malloc(sizeof(*bus));
+
+	if (!bus) {
+		printk(BIOS_ERR, "%s: failed to allocate bus structure\n",
+		       __func__);
+		return 1;
+	}
+
+	bus->gcc_apcs_regs = (void *)(MSM_GCC_BASE + GCC_PLL_APCS_REG);
+	bus->lcc_pll0_regs = (void *)(MSM_LPASS_LCC_BASE + LCC_PLL0_MODE_REG);
+	bus->lcc_ahbix_regs = (void *)(MSM_LPASS_LCC_BASE + LCC_AHBIX_NS_REG);
+	bus->lcc_mi2s_regs = (void *)(MSM_LPASS_LCC_BASE + LCC_MI2S_NS_REG);
+	bus->lcc_pll_regs = (void *)(MSM_LPASS_LCC_BASE + LCC_PLL_PCLK_REG);
+
+
+	if (lcc_init_enable_pll0(bus))
+		return 1;
+	if (lcc_init_enable_ahbix(bus))
+		return 1;
+	if (lcc_init_mi2s(bus, frequency))
+		return 1;
+
+	if (lcc_enable_mi2s(bus))
+		return 1;
+
+	return 0;
+}