5  * SPDX-License-Identifier:	GPL-2.0+
12 #include <keyboard.h>
15 #include <tegra-kbc.h>
19 #include <asm/arch-tegra/timer.h>
41 	KBC_CLOCK_KHZ		= 32,	/* Keyboard uses a 32KHz clock */
44 /* keyboard controller config and state */
49 	struct kbc_tegra *kbc;		/* tegra keyboard controller */
50 	unsigned char inited;		/* 1 if keyboard has been inited */
54 	 * After init we must wait a short time before polling the keyboard.
55 	 * This gives the tegra keyboard controller time to react after reset
58 	unsigned int init_dly_ms;	/* Delay before we can read keyboard */
65  * reads the keyboard fifo for current keypresses
67  * @param priv		Keyboard private data
82 			kp_ent = readl(&priv->kbc->kp_ent[i / 4]);  in tegra_kbc_find_keys()
84 		key->valid = (kp_ent & KBC_KPENT_VALID) != 0;  in tegra_kbc_find_keys()
85 		key->row = (kp_ent >> 3) & 0xf;  in tegra_kbc_find_keys()
86 		key->col = kp_ent & 0x7;  in tegra_kbc_find_keys()
91 	return key_matrix_decode(&priv->matrix, keys, KBC_MAX_KPENT, fifo,  in tegra_kbc_find_keys()
99  * consists of from 1-8 keycodes, representing the keycodes which
103  * for each. Not that one set may produce more than one ASCII characters -
110  * @param priv		Keyboard private data
111  * @param fifo_cnt	Number of entries in the keyboard fifo
123 		input_send_keycodes(priv->input, fifo, cnt);  in process_fifo()
124 	} while (--fifo_cnt > 0);  in process_fifo()
128  * Check the keyboard controller and emit ASCII characters for any keys that
131  * @param priv		Keyboard private data
137 	if (!priv->first_scan &&  in check_for_keys()
138 	    get_timer(priv->last_poll_ms) < KBC_REPEAT_RATE_MS)  in check_for_keys()
140 	priv->last_poll_ms = get_timer(0);  in check_for_keys()
141 	priv->first_scan = 0;  in check_for_keys()
144 	 * Once we get here we know the keyboard has been scanned. So if there  in check_for_keys()
147 	fifo_cnt = (readl(&priv->kbc->interrupt) >> 4) & 0xf;  in check_for_keys()
157  * @param priv		Keyboard private data
161 	if (!priv->inited) {  in kbd_wait_for_fifo_init()
165 		elapsed_time = get_timer(priv->start_time_ms);  in kbd_wait_for_fifo_init()
166 		delay_ms = priv->init_dly_ms - elapsed_time;  in kbd_wait_for_fifo_init()
172 		priv->inited = 1;  in kbd_wait_for_fifo_init()
177  * Check the tegra keyboard, and send any keys that are pressed.
187 	struct tegra_kbd_priv *priv = dev_get_priv(input->dev);  in tegra_kbc_check()
195 /* configures keyboard GPIO registers to use the rows and columns */
209 		row_cfg = readl(&kbc->row_cfg[r_offs]);  in config_kbc_gpio()
210 		col_cfg = readl(&kbc->col_cfg[c_offs]);  in config_kbc_gpio()
215 		if (i < priv->matrix.num_rows) {  in config_kbc_gpio()
218 			col_cfg |= (((i - priv->matrix.num_rows) << 1) | 1)  in config_kbc_gpio()
222 		writel(row_cfg, &kbc->row_cfg[r_offs]);  in config_kbc_gpio()
223 		writel(col_cfg, &kbc->col_cfg[c_offs]);  in config_kbc_gpio()
228  * Start up the keyboard device
232 	struct kbc_tegra *kbc = priv->kbc;  in tegra_kbc_open()
237 	 * We will scan at twice the keyboard repeat rate, so that there is  in tegra_kbc_open()
241 	writel(scan_period * KBC_CLOCK_KHZ, &kbc->rpt_dly);  in tegra_kbc_open()
242 	writel(scan_period * KBC_CLOCK_KHZ, &kbc->init_dly);  in tegra_kbc_open()
244 	 * Before reading from the keyboard we must wait for the init_dly  in tegra_kbc_open()
247 	priv->init_dly_ms = scan_period * 2 + 2;  in tegra_kbc_open()
252 	writel(val, &kbc->control);  in tegra_kbc_open()
254 	priv->start_time_ms = get_timer(0);  in tegra_kbc_open()
255 	priv->last_poll_ms = get_timer(0);  in tegra_kbc_open()
256 	priv->next_repeat_ms = priv->last_poll_ms;  in tegra_kbc_open()
257 	priv->first_scan = 1;  in tegra_kbc_open()
267 	config_kbc_gpio(priv, priv->kbc);  in tegra_kbd_start()
270 	debug("%s: Tegra keyboard ready\n", __func__);  in tegra_kbd_start()
276  * Set up the tegra keyboard. This is called by the stdio device handler
278  * We want to do this init when the keyboard is actually used rather than
279  * at start-up, since keyboard input may not currently be selected.
281  * Once the keyboard starts there will be a period during which we must
282  * wait for the keyboard to init. We do this only when a key is first
283  * read - see kbd_wait_for_fifo_init().
285  * @return 0 if ok, -ve on error
291 	struct stdio_dev *sdev = &uc_priv->sdev;  in tegra_kbd_probe()
292 	struct input_config *input = &uc_priv->input;  in tegra_kbd_probe()
295 	priv->kbc = (struct kbc_tegra *)devfdt_get_addr(dev);  in tegra_kbd_probe()
296 	if ((fdt_addr_t)priv->kbc == FDT_ADDR_T_NONE) {  in tegra_kbd_probe()
297 		debug("%s: No keyboard register found\n", __func__);  in tegra_kbd_probe()
298 		return -EINVAL;  in tegra_kbd_probe()
302 	/* Decode the keyboard matrix information (16 rows, 8 columns) */  in tegra_kbd_probe()
303 	ret = key_matrix_init(&priv->matrix, 16, 8, 1);  in tegra_kbd_probe()
308 	ret = key_matrix_decode_fdt(dev, &priv->matrix);  in tegra_kbd_probe()
315 	if (priv->matrix.fn_keycode) {  in tegra_kbd_probe()
316 		ret = input_add_table(input, KEY_FN, -1,  in tegra_kbd_probe()
317 				      priv->matrix.fn_keycode,  in tegra_kbd_probe()
318 				      priv->matrix.key_count);  in tegra_kbd_probe()
326 	priv->input = input;  in tegra_kbd_probe()
327 	input->dev = dev;  in tegra_kbd_probe()
328 	input->read_keys = tegra_kbc_check;  in tegra_kbd_probe()
329 	strcpy(sdev->name, "tegra-kbc");  in tegra_kbd_probe()
344 	{ .compatible = "nvidia,tegra20-kbc" },