1 From 074036f9de6b8c5fc642e8e2540950f6a35aa804 Mon Sep 17 00:00:00 2001
2 From: Ram Chandra Jangir <rjangir@codeaurora.org>
3 Date: Thu, 20 Apr 2017 10:31:10 +0530
4 Subject: [PATCH] qcom: mtd: nand: Add bam_dma support in qcom_nand driver
6 The current driver only support ADM DMA so this patch adds the
7 BAM DMA support in current NAND driver with compatible string
9 Added bam channels and data buffers, NAND BAM uses 3 channels:
10 command, data tx and data rx, while ADM uses only single channel.
11 So this patch adds the BAM channel in device tree and using the
12 same in NAND driver allocation function.
14 Signed-off-by: Ram Chandra Jangir <rjangir@codeaurora.org>
16 .../devicetree/bindings/mtd/qcom_nandc.txt | 69 +++++++--
17 drivers/mtd/nand/qcom_nandc.c | 160 +++++++++++++++++----
18 2 files changed, 190 insertions(+), 39 deletions(-)
20 --- a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
21 +++ b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
23 * Qualcomm NAND controller
26 -- compatible: should be "qcom,ipq806x-nand"
27 +- compatible: "qcom,ipq806x-nand" for IPQ8064 which uses
29 + "qcom,ebi2-nand-bam" - nand drivers using BAM DMA
31 - reg: MMIO address range
32 - clocks: must contain core clock and always on clock
33 - clock-names: must contain "core" for the core clock and "aon" for the
35 - dmas: DMA specifier, consisting of a phandle to the ADM DMA
36 - controller node and the channel number to be used for
37 - NAND. Refer to dma.txt and qcom_adm.txt for more details
38 -- dma-names: must be "rxtx"
39 -- qcom,cmd-crci: must contain the ADM command type CRCI block instance
40 - number specified for the NAND controller on the given
42 -- qcom,data-crci: must contain the ADM data type CRCI block instance
43 - number specified for the NAND controller on the given
45 + or BAM DMA controller node and the channel number to
46 + be used for NAND. Refer to dma.txt, qcom_adm.txt(ADM)
47 + and qcom_bam_dma.txt(BAM) for more details
48 +- dma-names: "rxtx" - ADM
49 + "tx", "rx", "cmd" - BAM
50 +- qcom,cmd-crci: Only required for ADM DMA. must contain the ADM command
51 + type CRCI block instance number specified for the NAND
52 + controller on the given platform.
53 +- qcom,data-crci: Only required for ADM DMA. must contain the ADM data
54 + type CRCI block instance number specified for the NAND
55 + controller on the given platform.
56 - #address-cells: <1> - subnodes give the chip-select number
59 @@ -44,7 +49,7 @@ partition.txt for more detail.
63 - compatible = "qcom,ebi2-nandc";
64 + compatible = "qcom,ipq806x-nand","qcom.qcom_nand";
65 reg = <0x1ac00000 0x800>;
67 clocks = <&gcc EBI2_CLK>,
68 @@ -58,6 +63,48 @@ nand@1ac00000 {
74 + compatible = "qcom,nandcs";
77 + nand-ecc-strength = <4>;
78 + nand-ecc-step-size = <512>;
79 + nand-bus-width = <8>;
82 + compatible = "fixed-partitions";
83 + #address-cells = <1>;
87 + label = "boot-nand";
88 + reg = <0 0x58a0000>;
93 + reg = <0x58a0000 0x4000000>;
100 + compatible = "qcom,ebi2-nandc-bam";
101 + reg = <0x79B0000 0x1000>;
103 + clocks = <&gcc EBI2_CLK>,
104 + <&gcc EBI2_AON_CLK>;
105 + clock-names = "core", "aon";
107 + dmas = <&qpicbam 0>,
110 + dma-names = "tx", "rx", "cmd";
112 + #address-cells = <1>;
116 compatible = "qcom,nandcs";
117 --- a/drivers/mtd/nand/qcom_nandc.c
118 +++ b/drivers/mtd/nand/qcom_nandc.c
119 @@ -226,6 +226,7 @@ struct nandc_regs {
120 * by upper layers directly
121 * @buf_size/count/start: markers for chip->read_buf/write_buf functions
122 * @reg_read_buf: local buffer for reading back registers via DMA
123 + * @reg_read_buf_phys: contains dma address for register read buffer
124 * @reg_read_pos: marker for data read in reg_read_buf
126 * @regs: a contiguous chunk of memory for DMA register
127 @@ -234,7 +235,10 @@ struct nandc_regs {
128 * @cmd1/vld: some fixed controller register values
129 * @ecc_modes: supported ECC modes by the current controller,
130 * initialized via DT match data
132 + * @bch_enabled: flag to tell whether BCH or RS ECC mode is used
133 + * @dma_bam_enabled: flag to tell whether nand controller is using
136 struct qcom_nand_controller {
137 struct nand_hw_control controller;
138 struct list_head host_list;
139 @@ -247,17 +251,28 @@ struct qcom_nand_controller {
140 struct clk *core_clk;
143 - struct dma_chan *chan;
144 - unsigned int cmd_crci;
145 - unsigned int data_crci;
146 struct list_head desc_list;
149 + struct dma_chan *tx_chan;
150 + struct dma_chan *rx_chan;
151 + struct dma_chan *cmd_chan;
154 + struct dma_chan *chan;
155 + unsigned int cmd_crci;
156 + unsigned int data_crci;
161 + bool dma_bam_enabled;
166 __le32 *reg_read_buf;
167 + dma_addr_t reg_read_buf_phys;
170 struct nandc_regs *regs;
171 @@ -316,6 +331,17 @@ struct qcom_nand_host {
176 + * This data type corresponds to the nand driver data which will be used at
177 + * driver probe time
178 + * @ecc_modes - ecc mode for nand
179 + * @dma_bam_enabled - whether this driver is using bam
181 +struct qcom_nand_driver_data {
183 + bool dma_bam_enabled;
186 static inline struct qcom_nand_host *to_qcom_nand_host(struct nand_chip *chip)
188 return container_of(chip, struct qcom_nand_host, chip);
189 @@ -1893,7 +1919,7 @@ static int qcom_nand_host_setup(struct q
190 | wide_bus << WIDE_FLASH
191 | 1 << DEV0_CFG1_ECC_DISABLE;
193 - host->ecc_bch_cfg = host->bch_enabled << ECC_CFG_ECC_DISABLE
194 + host->ecc_bch_cfg = !host->bch_enabled << ECC_CFG_ECC_DISABLE
196 | host->cw_data << ECC_NUM_DATA_BYTES
197 | 1 << ECC_FORCE_CLK_OPEN
198 @@ -1942,16 +1968,46 @@ static int qcom_nandc_alloc(struct qcom_
202 - nandc->reg_read_buf = devm_kzalloc(nandc->dev,
203 - MAX_REG_RD * sizeof(*nandc->reg_read_buf),
205 - if (!nandc->reg_read_buf)
207 + if (!nandc->dma_bam_enabled) {
208 + nandc->reg_read_buf = devm_kzalloc(nandc->dev,
210 + sizeof(*nandc->reg_read_buf),
213 - nandc->chan = dma_request_slave_channel(nandc->dev, "rxtx");
214 - if (!nandc->chan) {
215 - dev_err(nandc->dev, "failed to request slave channel\n");
217 + if (!nandc->reg_read_buf)
220 + nandc->chan = dma_request_slave_channel(nandc->dev, "rxtx");
221 + if (!nandc->chan) {
222 + dev_err(nandc->dev, "failed to request slave channel\n");
226 + nandc->reg_read_buf = dmam_alloc_coherent(nandc->dev,
228 + sizeof(*nandc->reg_read_buf),
229 + &nandc->reg_read_buf_phys, GFP_KERNEL);
231 + if (!nandc->reg_read_buf)
234 + nandc->tx_chan = dma_request_slave_channel(nandc->dev, "tx");
235 + if (!nandc->tx_chan) {
236 + dev_err(nandc->dev, "failed to request tx channel\n");
240 + nandc->rx_chan = dma_request_slave_channel(nandc->dev, "rx");
241 + if (!nandc->rx_chan) {
242 + dev_err(nandc->dev, "failed to request rx channel\n");
246 + nandc->cmd_chan = dma_request_slave_channel(nandc->dev, "cmd");
247 + if (!nandc->cmd_chan) {
248 + dev_err(nandc->dev, "failed to request cmd channel\n");
253 INIT_LIST_HEAD(&nandc->desc_list);
254 @@ -1964,8 +2020,35 @@ static int qcom_nandc_alloc(struct qcom_
256 static void qcom_nandc_unalloc(struct qcom_nand_controller *nandc)
258 - dma_release_channel(nandc->chan);
260 + if (nandc->dma_bam_enabled) {
261 + if (nandc->tx_chan)
262 + dma_release_channel(nandc->tx_chan);
264 + if (nandc->rx_chan)
265 + dma_release_channel(nandc->rx_chan);
267 + if (nandc->cmd_chan)
268 + dma_release_channel(nandc->tx_chan);
270 + if (nandc->reg_read_buf)
271 + dmam_free_coherent(nandc->dev, MAX_REG_RD *
272 + sizeof(*nandc->reg_read_buf),
273 + nandc->reg_read_buf,
274 + nandc->reg_read_buf_phys);
277 + dma_release_channel(nandc->chan);
279 + if (nandc->reg_read_buf)
280 + devm_kfree(nandc->dev, nandc->reg_read_buf);
284 + devm_kfree(nandc->dev, nandc->regs);
286 + if (nandc->data_buffer)
287 + devm_kfree(nandc->dev, nandc->data_buffer);
290 /* one time setup of a few nand controller registers */
291 static int qcom_nandc_setup(struct qcom_nand_controller *nandc)
292 @@ -2002,6 +2085,8 @@ static int qcom_nand_host_init(struct qc
293 mtd->name = devm_kasprintf(dev, GFP_KERNEL, "qcom_nand.%d", host->cs);
294 mtd->owner = THIS_MODULE;
295 mtd->dev.parent = dev;
297 + chip->priv = nandc;
299 chip->cmdfunc = qcom_nandc_command;
300 chip->select_chip = qcom_nandc_select_chip;
301 @@ -2049,16 +2134,20 @@ static int qcom_nandc_parse_dt(struct pl
302 struct device_node *np = nandc->dev->of_node;
305 - ret = of_property_read_u32(np, "qcom,cmd-crci", &nandc->cmd_crci);
307 - dev_err(nandc->dev, "command CRCI unspecified\n");
310 + if (!nandc->dma_bam_enabled) {
311 + ret = of_property_read_u32(np, "qcom,cmd-crci",
314 + dev_err(nandc->dev, "command CRCI unspecified\n");
318 - ret = of_property_read_u32(np, "qcom,data-crci", &nandc->data_crci);
320 - dev_err(nandc->dev, "data CRCI unspecified\n");
322 + ret = of_property_read_u32(np, "qcom,data-crci",
323 + &nandc->data_crci);
325 + dev_err(nandc->dev, "data CRCI unspecified\n");
331 @@ -2073,6 +2162,7 @@ static int qcom_nandc_probe(struct platf
332 struct device_node *dn = dev->of_node, *child;
333 struct resource *res;
335 + struct qcom_nand_driver_data *driver_data;
337 nandc = devm_kzalloc(&pdev->dev, sizeof(*nandc), GFP_KERNEL);
339 @@ -2087,7 +2177,10 @@ static int qcom_nandc_probe(struct platf
343 - nandc->ecc_modes = (unsigned long)dev_data;
344 + driver_data = (struct qcom_nand_driver_data *)dev_data;
346 + nandc->ecc_modes = driver_data->ecc_modes;
347 + nandc->dma_bam_enabled = driver_data->dma_bam_enabled;
349 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
350 nandc->base = devm_ioremap_resource(dev, res);
351 @@ -2179,7 +2272,15 @@ static int qcom_nandc_remove(struct plat
355 -#define EBI2_NANDC_ECC_MODES (ECC_RS_4BIT | ECC_BCH_8BIT)
356 +struct qcom_nand_driver_data ebi2_nandc_bam_data = {
357 + .ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT),
358 + .dma_bam_enabled = true,
361 +struct qcom_nand_driver_data ebi2_nandc_data = {
362 + .ecc_modes = (ECC_RS_4BIT | ECC_BCH_8BIT),
363 + .dma_bam_enabled = false,
367 * data will hold a struct pointer containing more differences once we support
368 @@ -2187,7 +2288,10 @@ static int qcom_nandc_remove(struct plat
370 static const struct of_device_id qcom_nandc_of_match[] = {
371 { .compatible = "qcom,ipq806x-nand",
372 - .data = (void *)EBI2_NANDC_ECC_MODES,
373 + .data = (void *) &ebi2_nandc_data,
375 + { .compatible = "qcom,ebi2-nandc-bam",
376 + .data = (void *) &ebi2_nandc_bam_data,